UNION TEXAS PETROLEUM HOLDINGS INC
10-K405, 1998-02-27
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
================================================================================
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   FORM 10-K
    [X]          ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
 
                  For the fiscal year ended December 31, 1997
 
                                       OR
 
    [ ]          TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                       OF THE SECURITIES EXCHANGE ACT OF 1934
 
                         Commission file number 1-9019
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                            <C>
                   DELAWARE                                      76-0040040
       (State or other jurisdiction of                        (I.R.S. Employer
        incorporation or organization)                      Identification No.)
   1330 POST OAK BOULEVARD, HOUSTON, TEXAS                         77056
   (Address of principal executive offices)                      (Zip Code)
</TABLE>
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (713) 623-6544
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
 
<TABLE>
<CAPTION>
                                                     NAME OF EACH EXCHANGE
          TITLE OF EACH CLASS                         ON WHICH REGISTERED
          -------------------                        ---------------------
<S>                                                 <C>
      Common Stock, $.05 par value                  New York Stock Exchange
                                                    Pacific Exchange, Inc.
      8.25% Senior Notes due 1999                   New York Stock Exchange
</TABLE>
 
        SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: NONE
 
     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]
 
     Indicate by check mark if disclosure of delinquent filings pursuant to Item
405 of Regulation S-K (sec.229.405 under the Securities Exchange Act of 1934) is
not contained herein, and will not be contained, to the best of registrant's
knowledge, in definitive proxy or information statements incorporated by
reference in Part III of this Form 10-K or any amendment to this Form 10-K.  [X]
 
     As of February 20, 1998, there were 85,161,652 shares of Union Texas
Petroleum Holdings, Inc. $.05 par value Common Stock issued and outstanding,
62,958,861 of which, having an aggregate market value of $1,231,632,718, were
held by non-affiliates of the registrant. For purposes of the above statement
only, all directors and executive officers of the registrant are assumed to be
affiliates.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     Portions of the Proxy Statement related to the registrant's 1998 Annual
Stockholders Meeting are incorporated by reference into Part III of this report.
================================================================================
<PAGE>   2
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                        PAGE
                                                                        ----
<S>       <C>                                                           <C>
                                   PART I
Item 1.   Business....................................................    3
          Overview....................................................    3
          Segment Data................................................    5
          Reserves....................................................    6
          Production..................................................    7
          Oil and Gas Prices and Production Costs.....................    7
          Acreage.....................................................    8
          Drilling Activities.........................................    8
          Exploration and Production..................................   10
          U.K. North Sea..............................................   10
          Indonesia...................................................   12
          Venezuela...................................................   17
          Pakistan....................................................   19
          Alaska......................................................   20
          Other Activities............................................   21
          Petrochemicals..............................................   23
          Plant Operations............................................   23
          Storage and Transportation..................................   23
          Other Matters...............................................   24
          Insurance...................................................   24
          Employees...................................................   24
          Risk Factors................................................   24
Item 2.   Properties..................................................   28
Item 3.   Legal Proceedings...........................................   28
Item 4.   Submission of Matters to a Vote of Security Holders.........   28
      
                                  PART II

Item 5.   Market for Registrant's Common Equity and Related
          Stockholder Matters.........................................   29
Item 6.   Selected Financial Data.....................................   30
Item 7.   Management's Discussion and Analysis of Financial Condition
          and Results of Operations...................................   30
Item 8.   Financial Statements and Supplementary Data.................   37
Item 9.   Changes in and Disagreements with Accountants on Accounting
          and Financial Disclosure....................................   66

                                  PART III

Item 10.  Directors and Executive Officers of the Registrant..........   67
Item 11.  Executive Compensation......................................   67
Item 12.  Security Ownership of Certain Beneficial Owners and
          Management..................................................   67
Item 13.  Certain Relationships and Related Transactions..............   68
     
                                  PART IV

Item 14.  Exhibits, Financial Statement Schedules and Reports on Form
          8-K.........................................................   68
</TABLE>
 
                                        2
<PAGE>   3
 
                                     PART I
 
ITEM 1. BUSINESS.
 
OVERVIEW
 
     The Company, the successor to a corporation founded in 1896, is a
U.S.-based independent (non-integrated) oil and gas company with worldwide
operations. At December 31, 1997, the Company had proved oil and gas reserves of
459 million barrels of oil equivalent. In February 1998, the Company recorded an
additional 114 million barrels of proved reserves in connection with its
Venezuelan acquisition. All of the Company's oil and gas producing activities
are currently conducted outside of the United States in the United Kingdom (the
"U.K.") sector of the North Sea, Indonesia, Venezuela and Pakistan. The Company
also operates a U.S.-based petrochemical business.
 
     The Company's principal current international activities began in the late
1960s with its participation in a joint venture in Indonesia and in two
consortia in the U.K. North Sea. In addition, the Company established Venezuela
as a significant core operated area with the 1998 acquisition of a 100% interest
in an operating service contract and a successful bid in 1997 for another
operating service contract. The Company is also currently engaged in exploration
and production activities in several other countries and development of an oil
field on Alaska's North Slope. International oil and gas properties accounted
for 93% of the Company's total proved reserves as of December 31, 1997. All of
the Company's net income attributable to its oil and gas operations in recent
periods has been generated by its international operations.
 
     The Company's principal properties in the U.K. North Sea are interests in
the Alba, Piper, Claymore, Saltire, Chanter, Iona and Scapa oil fields, the Sean
gas fields and the Britannia gas and condensate field. The Company has a 15.5%
working interest in Block 16/26, which includes the Alba field that came on
stream in 1994 and is operated by Chevron U.K. Limited. As of December 31, 1997,
the Company had recorded approximately 34 million barrels of oil as proved
reserves for the Alba field, of which 23 million barrels of oil are classified
as proved undeveloped. The Company also has a 9.42% unit interest in the
Britannia gas field, a portion of which underlies the Alba field. The Britannia
field is operated by Britannia Operator Limited, a joint venture between Conoco
(U.K.) Limited and Chevron U.K. Limited. As of December 31, 1997, the Company
had recorded 54 million barrels of oil equivalent of proved undeveloped reserves
for the Britannia field. Production from the Britannia field is expected to
begin in August 1998. The Company owns a 20% working interest in the Piper,
Claymore, Saltire, Chanter, Iona and Scapa oil fields, which are operated by Elf
Exploration UK plc, and a 25% working interest in the North, South and East Sean
gas fields, which are operated by Shell U.K. Limited.
 
     The Company's Indonesian activities consist primarily of its 37.81% working
interest in the East Kalimantan joint venture that produces natural gas and, to
a lesser extent, oil and condensate from several fields in Indonesia. The
Company holds its interests in this joint venture directly through a wholly
owned subsidiary and also indirectly through its 50% interest in Unimar Company
("Unimar"), which is a partnership with a subsidiary of LASMO plc, a U.K.
company. Unimar owns ENSTAR Corporation and its subsidiaries, including Virginia
Indonesia Company, the operator of the joint venture. The Company's interests in
Unimar are reported on its Consolidated Financial Statements as an equity
investment (the "Equity Partnership"). See Notes 5 and 19 of Notes to
Consolidated Financial Statements for additional information regarding the
Equity Partnership.
 
     Natural gas produced by the East Kalimantan joint venture is converted into
liquefied natural gas ("LNG") at facilities owned by Pertamina, the Indonesian
national oil and gas company. Currently, LNG is principally sold to two groups
of Japanese industrial and utility customers, the national oil company of the
Republic of China, a consortium of buyers organized by Osaka Gas, and Korea Gas
Corporation, under long-term contracts originally signed in 1973, 1981, 1987,
1990 and 1991, respectively. In 1995, Pertamina extended its 1973 and 1981
long-term LNG sales contracts and signed agreements for two new long-term LNG
sales contracts. Payments for LNG under all LNG sales contracts are made in U.S.
dollars directly to a bank in the U.S. During 1997, 80% of the joint venture's
share of LNG was sold, and in 1998, 74% is expected to be sold, by Pertamina to
Japanese customers. To supply the additional quantities of LNG called for
 
                                        3
<PAGE>   4
 
primarily by the 1973 contract extension, Pertamina completed construction of a
seventh processing train at the Bontang LNG facility in November 1997. Financing
of an eighth train was consummated in March 1997 and construction began in July
1997 primarily to support the new sales contracts. The Company is also
participating in exploration activities of the East Kalimantan joint venture, as
well as exploration activities independent of that joint venture in other parts
of Indonesia.
 
     The Company's activities in Venezuela consist of its interest in two
operating service contracts covering the Desarrollo Zulia Occidental ("DZO")
unit and the Boqueron contract area. The Company's reserves in Venezuela
currently account for over 25% of the Company's worldwide reserves. In February
1998, the Company acquired all of the stock of Compania Occidental de
Hidrocarburos, Inc. ("Hidrocarburos"), a U.S. affiliate of Occidental Oil and
Gas Corporation ("Occidental"), for approximately $212 million, which included
approximately $14 million of working capital and certain closing adjustments
effective December 31, 1997. Occidental may receive contingent payments of up to
a maximum of $15 million annually for six years based primarily on the level of
oil prices. Hidrocarburos operates the DZO unit under its 100% interest in an
operating service contract with a subsidiary of the national oil company,
Petroleos de Venezuela S.A. ("PDVSA"). As of February 1998, the Company had
recorded for the DZO unit 114 million barrels of proved reserves, of which 56
million barrels are classified as proved undeveloped. In June 1997, the Company
and its co-venturer, Preussag Energie GmbH of Germany, were the successful
bidders for the Boqueron area service contract awarded under Venezuela's Third
Operating Agreement Round. The Company has a 66.67% interest in the Boqueron
operating service contract and expects to assume operatorship in May 1998. As of
December 31, 1997, the Company recorded 40 million barrels of proved reserves
for the Boqueron contract area.
 
     Since 1977, the Company has operated through joint ventures oil and gas
exploration, development and production activities in the Badin area in
Pakistan. Oil production from the Badin area began in 1982, and gas production
began in 1989. The Company has working interests of either 30% or 25.5% in the
currently producing fields. The Company also has other concessions in Pakistan.
 
     The Company and its co-venturers, ARCO Alaska, Inc. and Anadarko Petroleum
Corp., are developing the Alpine oil field in the Western Colville area on
Alaska's North Slope. ARCO is the operator of the field. The Company has a 22%
working interest in the Alpine field. As of December 31, 1997, proved
undeveloped reserves (net) for the field were 32 million barrels of oil.
Production from the Alpine field is expected to begin in the first part of 2000.
 
     The Company pursues opportunities and participates worldwide in exploration
for oil and gas in both new venture areas and the Company's producing areas.
Current worldwide activity is in Alaska, Algeria, Bolivia, China, Egypt, Greece,
Ireland, Italy, Jordan, Kazakhstan/Caspian Sea, Papua New Guinea, Sicily,
Trinidad, Tunisia and Yemen and other areas in Latin America, Africa and the
Middle East, as well as the U.K., Indonesia, Venezuela and Pakistan.
 
     In the United States, the Company operates the Geismar olefins plant in
which it owns a 41.67% interest. Located near Baton Rouge, Louisiana, the
Geismar plant, which currently has a 1.275 billion annual gross pounds capacity
(531 million net), processes gas liquids feedstocks to produce ethylene for sale
to several petrochemical manufacturers for the production of plastics used in
various consumer products. In 1997, the Company finished construction of a
thirteenth furnace and in the first quarter of 1998, commenced the upgrading of
nine of the plant's existing furnaces with completion expected in early 1999.
The Company is studying additional opportunities to expand and add value to its
petrochemical business.
 
     In February 1998, the Board of Directors of the Company approved a $413
million capital expenditure budget for 1998, an increase of about 60% from the
$262 million spent in 1997. Approximately $284 million has been budgeted for oil
and gas development projects in Venezuela, the U.K. North Sea, Indonesia,
Pakistan and Alaska, including $79 million for Venezuela, $56 million for the
U.K. and $50 million for Alaska. The Company has budgeted approximately $82
million for exploration projects in the U.K. North Sea, Indonesia and Pakistan
and new venture exploration activities. Approximately $39 million has been
budgeted for the Company's U.S. petrochemical interests. The purchase costs of
the Venezuelan acquisitions and potential acquisitions are not included in
capital expenditures or the budgets.
                                        4
<PAGE>   5
 
     Unless the context otherwise requires, references herein to the Company are
not intended to imply exact corporate relationships and include Union Texas
Petroleum Holdings, Inc., its predecessors and its subsidiaries, including their
interests in certain joint ventures and partnerships. Union Texas Petroleum
Holdings, Inc. was organized under the laws of the State of Delaware in 1982.
The address and telephone number of the Company's principal executive offices
are 1330 Post Oak Blvd., Houston, Texas 77056, (713) 623-6544. As of February
20, 1998, the Company had approximately 1,300 full-time employees worldwide. For
a discussion of risks, uncertainties and assumptions affecting the Company's
business, see "-- Risk Factors" and Item 7 -- Management's Discussion and
Analysis of Financial Condition and Results of Operations.
 
SEGMENT DATA
 
     The table below summarizes the Company's revenues, net income and
identifiable assets by areas of activity for the past three years(a):
 
<TABLE>
<CAPTION>
                                               AS OF OR FOR THE
                                           YEAR ENDED DECEMBER 31,
                                          --------------------------
                                           1997      1996      1995
                                          ------    ------    ------
                                            (DOLLARS IN MILLIONS)
<S>                                       <C>       <C>       <C>
Exploration and production:
  Sales and operating revenues:
     United Kingdom.....................  $  367    $  406    $  323
     Indonesia..........................     287       341       276
     Pakistan...........................      66        66        51
     Other International................                           1
                                          ------    ------    ------
          Total.........................  $  720    $  813    $  651
                                          ======    ======    ======
  Net income (loss):
     United Kingdom.....................      68        85        46
     Indonesia..........................     106       121        95
     Pakistan...........................      19        27        14
     Other International................     (88)      (33)      (49)
     United States (Alaska).............      (3)       (8)       (6)
                                          ------    ------    ------
          Total.........................  $  102    $  192    $  100
                                          ======    ======    ======
  Identifiable assets:
     United Kingdom.....................   1,156     1,244     1,168
     Indonesia..........................     415       444       459
     Venezuela..........................     126
     Pakistan...........................      67        60        46
     Other International................      43        15         9
     United States (Alaska).............      38        23        13
                                          ------    ------    ------
          Total.........................  $1,845    $1,786    $1,695
                                          ======    ======    ======
  Petrochemicals:
     Sales and operating revenues.......  $  188    $  193    $  200
     Net income (b).....................      20        15        38
     Identifiable assets................     134       116       111
</TABLE>
 
- ---------------
 
(a)  Net income (loss) and identifiable assets do not give effect to general and
     administrative items. See Note 15 of Notes to Consolidated Financial
     Statements for additional data.
 
(b)  Includes assumed U.S. taxes at regular statutory tax rates. The Company,
     however, was subject to the U.S. corporate alternative minimum tax during
     the periods indicated.
 
     As reflected in the preceding table, a significant portion of the Company's
income was generated from its overseas operations, particularly its
participation in the producing fields in the East Kalimantan area of Indonesia
and in the U.K. North Sea. All of the Company's oil and gas and petrochemical
activities are
 
                                        5
<PAGE>   6
 
subject to a variety of risks. See "-- Risk Factors" and Item 7 -- Management's
Discussion and Analysis of Financial Condition and Results of Operations.
 
RESERVES
 
     The following table sets forth information regarding the Company's
estimates of its proved net reserves as of December 31, 1997. The Company's
estimates of reserves filed with federal agencies, including the Securities and
Exchange Commission, agree with the information set forth below. See "-- Risk
Factors," Item 7 -- Management's Discussion and Analysis of Financial Condition
and Results of Operations and Note 19 of Notes to Consolidated Financial
Statements.
 
<TABLE>
<CAPTION>
                               OIL (MBbls)(a)(b)                     GAS (MMcf)(b)               OIL EQUIVALENTS (Mboe)(a)(b)
                       ---------------------------------  -----------------------------------  ---------------------------------
                       DEVELOPED   UNDEVELOPED    TOTAL   DEVELOPED   UNDEVELOPED     TOTAL    DEVELOPED   UNDEVELOPED    TOTAL
                       ---------   -----------   -------  ---------   -----------   ---------  ---------   -----------   -------
<S>                    <C>         <C>           <C>      <C>         <C>           <C>        <C>         <C>           <C>
United Kingdom.......    40,835      35,820       76,655   124,843      247,349       372,192    62,360       78,466     140,826
Indonesia(c).........    17,473       1,775       19,248   670,415      110,674       781,089   133,062       20,857     153,919
Venezuela(d).........    40,000                   40,000                                         40,000                   40,000
Pakistan.............     4,206       1,640        5,846    75,107       44,787       119,894    17,155        9,362      26,517
Alaska...............                32,005       32,005                                                      32,005      32,005
                        -------      ------      -------  ---------     -------     ---------   -------      -------     -------
        Total........   102,514      71,240      173,754   870,365      402,810     1,273,175   252,577      140,690     393,267
                        -------      ------      -------  ---------     -------     ---------   -------      -------     -------
Equity Partnership:
  Indonesia(c).......     7,316         749        8,065   284,535       47,134       331,669    56,374        8,875      65,249
                        -------      ------      -------  ---------     -------     ---------   -------      -------     -------
        Total........   109,830      71,989      181,819  1,154,900     449,944     1,604,844   308,951      149,565     458,516
                        =======      ======      =======  =========     =======     =========   =======      =======     =======
</TABLE>
 
- ---------------
 
(a)  For the purpose of calculating reserves, oil includes condensate, and for
     the U.K., oil also includes natural gas liquids.
 
(b)  Unless otherwise indicated in this Annual Report on Form 10-K, gas volumes
     are stated at the legal pressure base of the area or country in which the
     reserves are located and at 60 degrees Fahrenheit. As used herein, the term
     "BTU" means British thermal unit, the term "TBtu" means trillion BTUs, the
     term "MMBtu" means million BTUs, the term "Mcf" means thousand cubic feet,
     the term "MMcf" means million cubic feet, the term "Bcf" means billion
     cubic feet, the term "Tcf" means trillion cubic feet, the term "Bbl" means
     barrel, the term "MBbls" means thousands of barrels, the term "MMBbls"
     means millions of barrels, the term "boe" means barrel of oil equivalent,
     the term "Mboe" means thousand barrels of oil equivalent and the term
     "MMboe" means million barrels of oil equivalent. Gas is converted into a
     barrel of oil equivalent based on 5.8 Mcf of gas to one barrel of oil. The
     term "LNG" means liquefied natural gas and the term "LPG" means liquefied
     petroleum gas.
 
(c)  Information regarding Indonesian reserves relates to the Company's net
     interest in a production sharing contract between the Indonesian joint
     venture and Pertamina. The joint venture has no ownership interest in the
     reserves but does have the right to share revenues and production and is
     entitled to recover most field and other operating costs and capital
     depreciation. The reserve estimates, which are based on year-end prices,
     are subject to revision as product prices and costs fluctuate due to the
     cost recovery feature under the production sharing contract. The impact on
     reserves is inversely related to price changes and directly related to
     changes in field operating and capital costs. In addition, reserve
     estimates are subject to revision due to the effect that price fluctuations
     generally have on estimates of recoverable reserves. Debt relating to the
     LNG processing facilities owned by Pertamina is contractually required to
     be serviced from proceeds of LNG sales prior to the distribution of such
     proceeds primarily to the members of the joint venture, Pertamina and the
     other production sharing contractors. The debt obligation is not the
     obligation of the joint venture. Debt service relating to such facilities
     is accounted for in the Company's reserve estimates as a cost of production
     and operation. Such debt service is deducted in estimating future net
     revenues to be distributed among Pertamina and the production sharing
     contractors, including the joint venture and the Company's interest
     therein. See "Exploration and Production -- Indonesia" below and Note 19 of
     Notes to Consolidated Financial Statements.
 
(d)  The reserves table, as well as the other tables in this Annual Report on
     Form 10-K, does not include the reserves associated with the DZO unit,
     which were recorded in February 1998. Information regarding all Venezuelan
     reserves relates to the Company's net interest in an operating service
     contract for the Boqueron area between the Company, the other contractor
     and a subsidiary of PDVSA. The Government
                                        6
<PAGE>   7
 
     of Venezuela retains full ownership of all hydrocarbons. The Company will
     receive a service fee for each barrel of crude oil produced at Boqueron,
     which consists of the following two components: (i) a set fee for the
     baseline production and (ii) a sliding incentive fee for the incremental
     production, as well as cost recovery for field and other capital and
     operating costs. See "Exploration and Production -- Venezuela" below and
     Note 19 of Notes to Consolidated Financial Statements.
 
PRODUCTION
 
     The following table sets forth the Company's average daily production of
oil, natural gas liquids and gas during 1997, 1996 and 1995:
 
<TABLE>
<CAPTION>
                                                                                           EQUITY
                                                     UNITED                              PARTNERSHIP
                                                     KINGDOM    INDONESIA    PAKISTAN     INDONESIA
                                                     -------    ---------    --------    -----------
<S>                                                  <C>        <C>          <C>         <C>
Oil (MBbls per day):
  1997.............................................    43            6           7            2
  1996.............................................    43            6           6            2
  1995.............................................    40            6           5            2
Natural gas liquids (MBbls per day):
  1997.............................................     1            2
  1996.............................................     2            2
  1995.............................................     2            1
Gas (MMcf per day):
  1997.............................................    29          219(a)       37           72(a)
  1996.............................................    46          258(a)       41           85(a)
  1995.............................................    34          251(a)       45           83(a)
</TABLE>
 
- ---------------
 
(a) Includes gas consumed in the operation of the Indonesian LNG plant.
 
OIL AND GAS PRICES AND PRODUCTION COSTS
 
     The Company's average sales prices and production costs of oil, natural gas
liquids and gas for 1997, 1996 and 1995 were as follows:
 
<TABLE>
<CAPTION>
                                                                                           EQUITY
                                                     UNITED                              PARTNERSHIP
                                                     KINGDOM    INDONESIA    PAKISTAN     INDONESIA
                                                     -------    ---------    --------    -----------
<S>                                                  <C>        <C>          <C>         <C>
Average sales prices:
Per Bbl of oil
  1997.............................................  $17.28      $19.71       $17.09       $19.71
  1996.............................................   19.60       19.49        17.75        19.49
  1995.............................................   16.14       17.14        14.24        17.14
Per Bbl of natural gas liquids
  1997.............................................   15.19       20.39
  1996.............................................   14.47       18.04
  1995.............................................   10.92       18.11
Per Mcf of gas
  1997.............................................    2.92        3.24(a)      1.61         3.24(a)
  1996.............................................    2.83        3.34(a)      1.61         3.34(a)
  1995.............................................    2.78        2.90(a)      1.32         2.90(a)
Average production costs per boe(b):
  1997.............................................    4.57        3.08(c)      2.15         2.87(c)
  1996.............................................    4.31        3.22(c)      2.39         3.05(c)
  1995.............................................    5.05        3.02(c)      3.55         2.72(c)
</TABLE>
 
                                                   (Footnotes on following page)
 
                                        7
<PAGE>   8
 
- ---------------
 
(a)  Includes natural gas sold to fertilizer plants and a refinery. The average
     sales price for LNG for 1997, 1996 and 1995 was $3.45, $3.52 and $3.03 per
     Mcf, respectively.
 
(b)  Primarily includes expenditures for operating expenses.
 
(c)  Includes plant processing costs and debt service on the Indonesian LNG
     processing facilities.
 
ACREAGE
 
     The following table summarizes the Company's developed and undeveloped
acreage at December 31, 1997, by geographic area. As used herein and in
"Drilling Activities" below, the term "gross" refers to acres or wells in which
the Company owns a working interest, and the term "net" refers to gross acres or
wells multiplied by the percentage of the working interest owned by the Company.
 
<TABLE>
<CAPTION>
                                                    DEVELOPED ACRES     UNDEVELOPED ACRES
                                                    ----------------    ------------------
                       AREA                         GROSS       NET      GROSS       NET
                       ----                         ------      ----    -------    -------
                                                            (NUMBERS IN THOUSANDS)
<S>                                                 <C>         <C>     <C>        <C>
United States (Alaska)............................                         396        119
United Kingdom....................................   148         20      1,017        191
Indonesia.........................................    97         25      5,715      2,356
Venezuela.........................................     7          4
Pakistan..........................................    32          9      5,519      3,349
Other International...............................                      18,698      7,719
                                                     ---         --     ------     ------
          Total...................................   284         58     31,345     13,734
                                                     ===         ==     ======     ======
Equity Partnership:
  Indonesia.......................................    97(a)      11      1,046(a)     121
                                                     ===         ==     ======     ======
</TABLE>
 
- ---------------
 
(a)  The Company also has a direct interest in such gross developed and
     undeveloped acreage, which is included above in the Company's gross acreage
     for Indonesia.
 
DRILLING ACTIVITIES
 
     At December 31, 1997, the Company's total gross and net productive oil and
gas wells, including multiple completions, by geographic area, were as shown in
the table below. The gross number of oil and gas wells with multiple completions
was 250.
 
<TABLE>
<CAPTION>
                                                        OIL WELLS          GAS WELLS
                                                      --------------    ---------------
                        AREA                          GROSS     NET     GROSS     NET
                        ----                          -----    -----    -----    ------
<S>                                                   <C>      <C>      <C>      <C>
United Kingdom......................................    69     13.22      29       4.60
Indonesia...........................................    80     19.97     395      95.92
Venezuela...........................................     9      6.00
Pakistan............................................    51     14.94      45      13.01
Other International.................................
                                                       ---     -----     ---     ------
          Total.....................................   209     54.13     469     113.53
                                                       ===     =====     ===     ======
Equity Partnership:
  Indonesia.........................................    80(a)   8.78     395(a)   42.25
                                                       ===     =====     ===     ======
</TABLE>
 
- ---------------
 
(a)  The Company also has a direct interest in such wells, which is included
     above in the Company's gross wells for Indonesia.
 
                                        8
<PAGE>   9
 
     The net productive and dry exploratory wells drilled during 1997, 1996 and
1995, by geographic area, were as follows:
 
<TABLE>
<CAPTION>
                                                         EXPLORATORY WELLS
                                              ---------------------------------------
                                                  PRODUCTIVE              DRY
                                              ------------------   ------------------
                    AREA                      1997   1996   1995   1997   1996   1995
                    ----                      ----   ----   ----   ----   ----   ----
<S>                                           <C>    <C>    <C>    <C>    <C>    <C>
United States (Alaska)......................         1.41(a)               .22
United Kingdom..............................                        .23    .16    .73
Indonesia...................................                        .26    .44    .33
Pakistan....................................   .77    .56   1.42   1.72   1.12   1.63
Other International.........................                       1.65          1.90
                                              ----   ----   ----   ----   ----   ----
          Total.............................   .77   1.97   1.42   3.86   1.94   4.59
                                              ====   ====   ====   ====   ====   ====
Equity Partnership:
  Indonesia.................................                        .11
                                                                   ====
</TABLE>
 
- ---------------
 
(a)  Includes net interest in four wells drilled prior to 1996, which were in
     suspense pending determination of commerciality.
 
     The net productive and dry development wells drilled during 1997, 1996 and
1995, by geographic area, were as follows:
 
<TABLE>
<CAPTION>
                                                         DEVELOPMENT WELLS
                                              ---------------------------------------
                                                  PRODUCTIVE              DRY
                                              ------------------   ------------------
                    AREA                      1997   1996   1995   1997   1996   1995
                    ----                      ----   ----   ----   ----   ----   ----
<S>                                           <C>    <C>    <C>    <C>    <C>    <C>
United Kingdom..............................  1.42    .87   1.36    .20    .20    .20
Indonesia...................................  2.05   1.95   3.90
Pakistan....................................  1.02   1.16    .86    .26    .86    .26
                                              ----   ----   ----   ----   ----   ----
          Total.............................  4.49   3.98   6.12    .46   1.06    .46
                                              ====   ====   ====   ====   ====   ====
Equity Partnership:
  Indonesia.................................   .90    .86   1.72
                                              ====   ====   ====
</TABLE>
 
     At December 31, 1997, wells in progress were as follows:
 
<TABLE>
<CAPTION>
                                                         EXPLORATORY      DEVELOPMENT
                                                        -------------    -------------
                         AREA                           GROSS    NET     GROSS    NET
                         ----                           -----    ----    -----    ----
<S>                                                     <C>      <C>     <C>      <C>
United States (Alaska)................................
United Kingdom........................................                    21      2.31
Indonesia.............................................                     4       .85
Pakistan..............................................    3       .77
Other International...................................    4      1.50
                                                          --     ----     --      ----
          Total.......................................    7      2.27     25      3.16
                                                          ==     ====     ==      ====
Equity Partnership:
  Indonesia...........................................                     4(a)    .37
                                                                          ==      ====
</TABLE>
 
- ---------------
 
(a)  The Company also has a direct interest in such wells, which is included
     above in the Company's gross wells for Indonesia.
 
     At December 31, 1997, there were pressure maintenance programs in the U.K.
North Sea and in Pakistan.
 
                                        9
<PAGE>   10
 
EXPLORATION AND PRODUCTION
 
  U.K. North Sea
 
     The Company's principal U.K. North Sea properties include interests in the
Alba, Piper, Claymore, Saltire, Chanter, Iona and Scapa oil fields, the Sean gas
fields and the Britannia gas and condensate field. The Company also owns a 20%
interest in the Flotta terminal and pipeline system located in the Orkney
Islands of northern Scotland, which currently handles approximately 10% of the
U.K.'s oil production.
 
     Alba Field. In July 1995, the Company acquired a 15.5% working and revenue
interest in the central U.K. North Sea's Block 16/26, which includes the Alba
oil field. The Alba field has been developed using a fixed platform located in
the northern part of the field from which oil is pumped to a permanently moored
floating storage unit three miles away. Shuttle tankers then transport the oil.
At year-end, proved reserves (net) for the Alba field were 34 MMBbls of oil, of
which 23 MMBbls are classified as proved undeveloped. The Company anticipates
recording additional proved reserves based on the field's production history and
future development activity. The Alba field, which commenced production in
January 1994, is expected to produce for over 20 years and maintain its 1997
peak production level in 1998. Average daily production (net to the Company) for
1997 was 14 MBbls of oil. During 1998, the Company expects to spend $32 million
on field development, including the construction of a gas pipeline, upgrading of
certain facilities and drilling activities. Chevron U.K. Limited operates the
field. Production from the Alba field is subject to U.K. corporation tax and the
U.K. Petroleum Revenue Tax ("PRT"), but is not subject to U.K. royalty.
 
     Britannia Field. The Company has a 9.42% unit interest in the undeveloped
Britannia natural gas and condensate field, a portion of which underlies the
Alba field, in the U.K. North Sea. As of December 31, 1997, the Company has
spent a total of $132 million on development, of which $41 million was spent in
1997 for platform fabrication and installation, and expects to spend
approximately $24 million in 1998. The Britannia field is operated by Britannia
Operator Limited, a joint venture between Conoco (U.K.) Limited and Chevron U.K.
Limited. Production from Britannia is expected to begin in August 1998 with a
production life of approximately 30 years. Long-term agreements have been
reached to sell a substantial portion of the gas production in the U.K. market
to: Kinetica Limited (a subsidiary of Powergen plc), Conoco (U.K.) Limited,
Mobil Gas Marketing (U.K.) Limited, National Power plc and Total Oil Marine plc.
The gas production will be processed at the SAGE terminal in St. Fergus in
northeastern Scotland, which has been expanded by the SAGE owners to accommodate
the Britannia production. In August 1997, the platform was installed in the
field. The gas and condensate export lines were successfully laid and tied-in
during the third quarter of 1997 and are expected to be fully operational in the
second quarter of 1998. Governmental approval for the habitation of the platform
was granted in December 1997. As of December 31, 1997, proved undeveloped
reserves (net) for the Britannia field were 54 MMboe. The Company anticipates
recording additional proved reserves based on the field's development results
and future production history. Production from the Britannia field will be
subject to the U.K. corporation tax, but will not be subject to U.K. royalty or
PRT.
 
     Piper and Claymore Fields. In 1971, the Company joined a consortium of
companies, of which Elf Exploration UK plc is now the operator, to explore for
oil and gas in certain areas of the U.K. North Sea. The Company has a 20%
working interest (17.5% revenue interest after government royalty) in the Piper
and Claymore fields discovered in 1972 and 1974, respectively. Production from
Piper and Claymore originally began in late 1976 and late 1977, respectively.
After being shut down in July 1988, Claymore recommenced in 1989, and Piper
recommenced in 1993 from a new fixed platform ("Piper B"). Oil production from
the fields is transferred 135 miles via the joint venture's pipeline to the
Flotta terminal. The remaining proved reserves (net) as of December 31, 1997,
contained in the Piper and Claymore fields were 10 MMboe and 14 MMboe,
respectively. Average daily production of oil and liquids (net to the Company)
for 1997 from the Piper and Claymore fields was 9 MBbls and 7 MBbls,
respectively.
 
     Piper Satellite Fields. The Company also has a 20% working and revenue
interest in the Saltire, Chanter and Iona fields, satellites to Piper. The
Saltire field was developed in 1993 with a fixed platform connected subsea to
the Piper B platform. The Chanter and Iona fields are subsea tiebacks to the
Piper B platform and the Saltire platform, respectively. Remaining proved
reserves (net) at December 31, 1997 for the three satellite fields are 4.5
MMboe.
 
                                       10
<PAGE>   11
 
     Claymore Satellite Field. The Scapa field, in which the Company has a 20%
working and revenue interest, was discovered in 1975 and is produced using a
subsea production facility tied to the Claymore platform. Average daily
production (net to the Company) for 1997 was 4 MBbls of oil and liquids.
Remaining proved reserves (net) at December 31, 1997, for the Scapa field were 4
MMboe.
 
     The Piper and Claymore fields are currently subject to PRT at a 50%
statutory rate, which is based on the net value of oil and gas produced from
each field and on pipeline tariffs. The U.K. tax structure has encouraged
development of fields in the North Sea by exempting all or part of their
production from PRT. These fields, such as the Saltire, Chanter, Iona and Scapa
fields, are referred to as edge oil fields because they generally have separate
field designations, incur little or no PRT, have no government royalty interest
burden and are generally developed as satellites from an existing platform. It
is anticipated that only small amounts of PRT, if any, will be paid on the
production from these fields. All production from any field receiving
development consent after March 16, 1993, such as the Britannia and Iona fields,
is exempt from PRT. Production exempted from PRT provides a greater contribution
to cash flow on a per-barrel basis. All production is subject to the U.K.
corporation tax, which is at the current rate of 31% (an effective rate of 25.5%
after benefits provided by the U.K./U.S. tax treaty). Under current U.S. tax
law, the PRT and U.K. corporation tax may be credited against U.S. taxes.
 
     Sean Fields. The Company has a 25% working interest (24.375% revenue
interest after overriding royalty) in the North, South and East Sean gas fields
located in the southern portion of the U.K. North Sea and operated by Shell U.K.
Limited. The proved reserves (net) as of December 31, 1997 for the fields were
20 MMboe.
 
     The Sean platforms, which currently serve the North, South and East Sean
fields, made their first deliveries in December 1986. Under the terms of a
long-term gas sales contract with British Gas Trading Limited (BGT), the Company
currently maintains each winter contract period the capability of delivering up
to 15 Bcf (net to the Company) from the North and South Sean fields. In recent
years, the average sales from these fields net to the Company has been 3.1 Bcf.
Inasmuch as there were higher sales during the 1996-1997 winter contract period
(10.5 Bcf net to the Company), and due to a mild winter, the Company expects
significantly lower than average sales for the 1997-1998 winter contract period.
This peak-shaving gas sales agreement also provides that currently proved gas
reserves from the North and South Sean fields are dedicated to the buyer. The
price under the gas sales agreement is based upon the volume of gas taken and
various U.K. price indices. The average price for 1997 was $3.19 per Mcf. During
the fall and winter months, the Company also earns a capacity charge, which is
independent of production levels, to ensure field deliverability of 600 MMcf
(gross) per day. The capacity charge for 1997 totaled $39 million (net to the
Company), and the revenue for the volume of gas taken on 38 days of production
was $18 million (net to the Company). Production from the North and South Sean
fields is subject to U.K. corporation tax and PRT, but is not subject to U.K.
royalty.
 
     Discovered in 1994, the East Sean field is separated from the producing
reservoirs of the North and South Sean fields, and as a result, production from
the East Sean field is not dedicated to the peak-shaving contract with BGT.
During 1997, the Company's share of gas from the East Sean field was sold, on
the U.K.'s short term gas market, to a number of companies. Average daily
production (net to the Company) for 1997 was 8 MMcf per day. Production from the
East Sean Field is subject to U.K. corporation tax but is not subject to U.K.
royalty or PRT.
 
     Customers. For 1997, the Company's U.K. operations had crude oil sales at
prevailing market prices to Texaco Limited equal to 12% of the Company's total
sales and operating revenues. Because of the market for Northwest European crude
oil, the Company believes that the loss of this customer would not have a
material adverse effect on the Company. See Note 13 of Notes to Consolidated
Financial Statements.
 
     Other Information. During 1997, the Company sold its 4.19% equity interest
in the unitized Ross field to a subsidiary of Nippon Oil. The consortium of the
Piper and Claymore fields have instigated a cost-reduction program, which is
expected to save the Company in excess of $20 million net over the next decade.
 
                                       11
<PAGE>   12
 
     Production from the Company's interests in the U.K. fields totaled 18 MMboe
during 1997, a decrease of 7% from 1996. In 1998, the Company expects production
from these fields to slightly decrease from the 1997 production level with
additional production expected to be contributed from the Britannia field by the
fourth quarter of 1998. Payment to the Company with respect to oil production
from the Alba, Piper, Claymore, Saltire, Chanter, Iona and Scapa fields is made
in U.S. dollars, and payments for gas production, including under the Sean gas
sales agreements, are made in pounds sterling. There are no significant
restrictions on the repatriation of funds from the Company's U.K. subsidiary to
the U.S. Dividends paid to the Company by its U.K. subsidiary are subject to a
25% U.K. advance corporation tax. For dividends paid before April 6, 1999,
approximately 27.5% of this tax (or approximately 6.9% of the dividend paid) is
available for immediate refunding to the Company by the U.K. government. For
dividends paid after April 5, 1999, approximately 2.5% of this tax (or
approximately 0.2778% of the dividend paid) is available for immediate refunding
to the Company by the U.K. government. All of this tax (including the refunded
portion) may be credited against the U.K. corporation tax paid by the Company's
U.K. subsidiary.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
  Indonesia
 
     The Company is engaged in oil and gas exploration, development and
production in Indonesia, primarily through a joint venture group it joined in
1969. Under a production sharing contract with Pertamina, the Indonesian
national oil company, which currently covers approximately 1.1 million acres,
the joint venture produces gas and, to a lesser extent, oil and condensate, in
the Sanga Sanga block in the East Kalimantan area. Substantially all of the
natural gas produced by the joint venture is supplied, pursuant to long-term
contracts with Pertamina, to a liquefaction plant owned by Pertamina at Bontang
Bay, approximately 35 miles from the production areas. At the Bontang plant, gas
is converted into LNG in parallel processing units ("trains") by reducing the
temperature of the gas to approximately minus 161 degrees Celsius. The Bontang
plant currently has seven trains in operation. Construction of a third dock and
LPG facilities began in February 1997 and is expected to be completed in 1999.
The financing of an eighth train, an additional LNG storage tank, an additional
natural gas pipeline and a debottlenecking project for the first six trains was
consummated in March 1997. Construction began in 1997 and is expected to be
completed by late 2000. After conversion, the LNG is pumped into specially
designed tankers (owned by third parties) and transported to purchasers in the
Pacific Rim, where it is returned to its original gaseous form and used for fuel
by electric utilities and industry. The Bontang plant also processes LPG.
 
     Production Sharing Contract and Drilling. The joint venture's production
sharing contract with Pertamina grants the joint venture the right to share in
the production and revenues from the contract area, but not ownership rights in
the oil and gas reserves. The joint venture's contract area in East Kalimantan
includes substantial portions of two fields, Badak and Nilam, as well as several
other fields. The joint venture has relinquished 20% of the area covered by the
production sharing contract since 1990 when the contract was extended and is
required to relinquish the following additional amounts of the area covered by
the contract: 10% by August 7, 1998, 10% by December 31, 2000, 15% by December
31, 2002, and 15% by December 31, 2004. The joint venture, however, is not
obligated to relinquish any area from which oil or natural gas is produced.
 
     The production sharing contract originally expired in 1998, but in 1990,
Pertamina and the joint venture amended the production sharing contract and
extended the joint venture's right to explore, develop and produce oil and gas
in the contract area until 2018 through a second production sharing contract,
containing terms and conditions generally similar to the amended production
sharing contract. References herein to the production sharing contract mean the
production sharing contract in effect for the applicable time period. The
production sharing contract entitles the joint venture participants to recover
most field and other operating costs, as well as capital depreciation, and to
receive, net of Indonesian taxes, 35% of the remaining gas production through
August 7, 1998, and 25% or 30%, depending upon the applicable LNG sales contract
and field supplying gas in support of such LNG sales contract, with some
exceptions, of such production for the remaining term of the contract. The
production sharing contract also entitles the joint venture participants to
                                       12
<PAGE>   13
 
take their respective shares of oil and condensate production in kind, and after
recovering operating expenses and capital depreciation, to retain 15% of the
proceeds from sales of such production, net of Indonesian taxes. Proceeds from
the sale of oil and condensate (except for that sold pursuant to the joint
venture's domestic market obligation discussed below) are currently based on
official Indonesian crude oil prices and reflect world market prices.
 
     The Company owns a 37.81% working interest in the joint venture (26.25%
directly and 11.56% through subsidiaries of Unimar, the Equity Partnership). The
Company's 11.56% indirect interest is subject to the right of holders of
Unimar's Indonesian Participating Units ("IPUs") to receive a percentage of
certain cash flow resulting from Unimar's interest in the joint venture until
September 25, 1999, at which time the IPUs will expire with no residual value to
the holder. In 1997, approximately one-fourth of the Company's interest in such
cash flow of Unimar was burdened by such payment obligation. Virginia Indonesia
Company, a participant in the joint venture and a subsidiary of Unimar, acts as
operator of the joint venture. The vote of participants holding 66 2/3% of the
total joint venture ownership interest is generally required for approval of
significant matters pertaining to the joint venture.
 
     At December 31, 1997, proved reserves (net) attributable to the Company's
total interest in the joint venture were approximately 1.1 Tcf of gas and 27
MMBbls of oil and condensate. For a discussion of factors that impact Indonesian
reserve estimates, see "Reserves" above and Note 19 of Notes to Consolidated
Financial Statements. Substantially all of the joint venture's natural gas
production and reserves are committed to several long-term supply agreements
with Pertamina, which obligate the joint venture to supply certain minimum
quantities of natural gas. The Company believes that there are adequate reserves
in the joint venture's production sharing contract area to supply natural gas
under the joint venture's contractual commitments outstanding as of December 31,
1997. Pertamina continues to make progress in marketing additional LNG volumes.
The percentage of the natural gas supplied by the joint venture in support of
future LNG or LPG sales contracts, or renewals or extensions of existing
long-term sales contracts, is dependent primarily upon the uncommitted reserves
of natural gas that the joint venture has in its production sharing contract
area at the time that Pertamina establishes the allocation of the natural gas
supply for such sales contracts among the various contractor groups in the East
Kalimantan area, which participation percentage has decreased. See "Sales
Contracts" below.
 
     In 1997 and 1996, nine and eight successful development wells,
respectively, were drilled in fields in East Kalimantan. During 1998, the
Company expects to spend approximately $42 million on development projects. In
addition, the joint venture plans to continue exploration efforts in 1998 by
seismic data acquisition and exploratory drilling. The joint venture also
continues to evaluate the East Kalimantan area to identify additional oil and
gas prospects. All of these expenditures will be cost recoverable pursuant to
the production sharing contract.
 
     The joint venture participants are required collectively to sell
approximately 8.5% (7.2% after August 7, 1998) of the total oil and condensate
production from most existing fields in the contract area at $0.20 per barrel
for domestic Indonesian consumption. The domestic market obligation is
suspended, however, for the first 60 months of production from new fields in the
contract area, after which the price will be 10% of the realized Indonesian
export price. These obligations are factored into the Company's net reserves
estimates. Each participant's remaining oil and condensate production is
generally sold in world oil markets. In addition to the oil and condensate sold
for domestic use, the joint venture supplies gas for domestic consumption, and
the amount supplied for such purposes may increase or decrease in the future.
Profits from gas supplied for domestic consumption, which was sold at an average
price of $1.06 per Mcf in 1997, are less than from gas supplied for LNG. Gas
supplied for domestic consumption constituted less than 8% of the joint
venture's gas production during 1997.
 
     Bontang Plant. At the Bontang plant, natural gas supplied by the joint
venture and other production sharing contractors is converted to LNG, and
shipped in LNG tankers ("cargoes"). These specially designed tankers vary in
size, and the term "cargo" as used herein means 125,000 cubic meters of LNG.
During 1997, the completion of the seventh train increased the production
capacity of the Bontang plant from 15.6 metric tons per annum to 18.5 metric
tons per annum. The Bontang plant currently has limited unused processing
 
                                       13
<PAGE>   14
 
capacity. See "Sales Contracts" below for more information. The amount of
revenue that the Company receives as a result of the production of natural gas
in support of the sale of LNG by Pertamina is dependent upon the number of
cargoes shipped each year, the Company's ultimate participation in each cargo,
the price the buyers must pay for the LNG purchased and the costs to be deducted
from the proceeds of sales of LNG.
 
     The Bontang plant is owned by Pertamina and operated on a
cost-reimbursement basis by a corporation owned in part by the joint venture.
The financing of the original two trains was repaid in 1990, and the financing
for the second two trains was repaid in 1993. Financing for construction of the
fifth train at the Bontang plant was provided principally from Japanese sources
through a funding arrangement under which debt service is paid to the lenders by
the Trustee (as defined below) from the proceeds of LNG sales, primarily under
the contract signed in 1987 with Chinese Petroleum Corporation ("CPC"), the
national oil company of the Republic of China (Taiwan). Final repayment is
scheduled in 2000. In 1991, Pertamina arranged $750 million under a similar
financing arrangement for the construction of the sixth train and associated
facilities at the Bontang plant. Construction began in 1991 and was completed in
late 1993 at a cost of approximately $700 million. Repayment began in 1994 from
proceeds of the Osaka contract (as defined below), and final repayment is
scheduled in 2004. In July 1995, a $969.5 million financing was completed for
the seventh train, third dock, LPG expansion and other support facilities. The
financing was provided from Japanese sources through arrangements similar to
those used to finance the Bontang plant's fifth and sixth trains. The
construction of the seventh train began in 1995 and was completed in November
1997. Repayment is scheduled to begin in December 1998 principally from the
proceeds of the short-term LNG sales contracts with CPC and Korea Gas
Corporation ("KGC") and starting in 2000, from the proceeds of the extension of
the 1973 contract, and final repayment is expected in 2008. In March 1997, a
$1,127 million financing was completed for the eighth train, an additional LNG
storage tank, an additional natural gas pipeline, a debottlenecking project for
the first six trains and other support facilities. The financing was primarily
provided by Taiwanese and Japanese sources through arrangements similar to those
used to finance the Bontang plant's fifth, sixth and seventh trains.
Construction of the eighth train began in July 1997 and is scheduled for
completion by 2000. Repayment of this financing is scheduled to begin in 2000
from the proceeds of the Badak V and Badak VI LNG sales contracts discussed
below. Financing of the fifth, sixth, seventh and eighth trains are nonrecourse
to both Pertamina and the joint venture.
 
     Sales Contracts. The joint venture currently has gas supply agreements with
Pertamina that support the long-term and short-term LNG sales contracts and
obligate the joint venture to provide certain quantities of natural gas for
fulfillment of Pertamina's obligations pursuant to the LNG sales contracts. The
supply agreements terminate concurrently with the expirations of their
respective LNG sales contracts. The Company's right to receive revenues from the
sale of LNG and LPG under existing contracts as well as any future new contracts
or extensions or renewals of existing contracts is affected by the allocation of
the gas supply obligation in support of Pertamina's sales contracts among the
joint venture and the other production sharing contractors supplying gas to the
Bontang plant, which allocations vary among the sales contracts. This allocation
is set by Pertamina and is primarily based upon uncommitted reserves of natural
gas available at the time Pertamina makes the allocation. The allocation to the
Company's joint venture in such contracts has declined over time since the
initial 1973 sales contract allocation at 97.9%, when the joint venture was
virtually the only supplier to the Bontang plant, to the present when there are
two other major production sharing contractors supplying gas to the Bontang
plant and sharing in the allocation of volumes. In 1997 and 1996, 87 Bcf and 106
Bcf, respectively, net to the Company, were delivered to Pertamina under these
supply agreements. Gas production for the joint venture in Indonesia has peaked.
The joint venture's share, which also includes the Company's net interest, in
LNG volumes from the Bontang plant declined in 1997 by approximately 18% as
compared to 1996 primarily due to a reduction in deliveries under the initial
1973 contract in which the joint venture has a high allocation interest. A
further decline in the joint venture's participation percentage in LNG volumes
of 18% is expected in 1998 as compared to 1997 due to the reduction in
deliveries under the 1973 contract as well as the reduction in the sharing
percentages under the production sharing contract from 35% to 25% or 30%
starting in August 1998. The effect of such lower gas supplies will not have as
significant an impact on the Company's total annual cash flow. See Production
Sharing Contract and Drilling above and the table below for more information.
 
                                       14
<PAGE>   15
 
     LNG is currently sold by Pertamina to two groups of Japanese industrial and
utility customers and to CPC under long-term contracts signed in 1973, 1981 and
1987, respectively. Additionally, sales of LNG began in November 1994 under a
long-term contract signed in 1990 with a consortium of buyers organized by Osaka
Gas, a Japanese utility (the "Osaka contract"). LNG is also sold by Pertamina
under additional long-term contracts with KGC signed in 1983 and 1991 (the
"Korean Carryover" and "Korea II" contracts, respectively) and under the
long-term Mid-Cities Gas Companies ("MCGC") contract signed in 1992. Some of the
added capacity from the expansion of the LNG facilities during 1993 is also used
to supply LNG sold under short-term contracts to Japanese, Korean and Taiwanese
buyers. The sales price under the LNG sales contracts is tied to an average of
prices for exported Indonesian crude oil. In 1997, 80% of the joint venture's
share of LNG was sold by Pertamina to Japanese customers. The Company expects in
1998 such percentage to be 74%, with Korean and Taiwanese customers purchasing
the remainder at 16% and 10%, respectively. Due to the current Asian economic
crisis, the ability of certain LNG customers to take their contractual
quantities may be impaired and Pertamina and such customers could agree either
to reduce or defer some contracted quantities. Although the Company cannot
predict the impact of the current Asian economic crisis on such customers, the
Company currently expects that it will not have a material impact on the Company
in 1998.
 
     In 1995, Pertamina finalized agreements to extend the LNG contracts
originally signed in 1973 and 1981 until 2010 and 2011, respectively. Pertamina
also signed agreements for two new long-term LNG sales contracts with CPC (Badak
VI) and KGC (Badak V), which provide for LNG sales from 1998 until 2017. To
support the supply of the additional quantities of LNG required primarily by the
1973 extended contract, the seventh train was completed in November 1997.
Construction of the eighth train and associated projects began in July 1997 and
is expected to be completed by 2000, primarily to support the supply of
quantities of LNG required by the new CPC and KGC long-term contracts.
 
     The 1973 and 1981 contracts (including extensions thereof) and the CPC, CPC
(Badak VI), Osaka, Korean Carryover, Korea II, KGC (Badak V) and MCGC contracts
(collectively, the "long-term contracts") contain take-or-pay provisions that
generally require that the purchasers either take the contracted quantities or
pay for such quantities even if not taken. Prior to any extensions, the initial
term of each long-term contract is approximately 20 years. The other contracts
described in the table below are short-term contracts and generally have a term
of ten years or less. Of the remaining LNG sales volumes to be delivered after
December 31, 1997, under all of the contracts described in the table below, the
long-term contracts and the short-term contracts represent approximately 98% and
2%, respectively, of such deliveries.
 
                                       15
<PAGE>   16
 
     The following table sets forth information regarding the Bontang LNG
plant's share of LNG sales contracts at December 31, 1997:
 
<TABLE>
<CAPTION>
                                                                                            JOINT
                                                                                          VENTURE'S
                                                                                          SHARE OF
                                                            REMAINING                     REMAINING
                                                               LNG                           LNG
                                                              SALES      JOINT VENTURE      SALES
                                               CONTRACT      VOLUMES     PARTICIPATION     VOLUMES
                                                 TERM        (TBtu)         %(a)(b)       (TBtu)(c)
                                               ---------    ---------    -------------    ---------
<S>                                            <C>          <C>          <C>              <C>
LONG-TERM:
  1973.......................................  1977-1999        367        97.9/27.2         102
  1973 Extension.............................  2000-2010      4,800               (d)         (d)
  1981.......................................  1983-2003        994        66.4/29.6         625
  1981 Extension.............................  2003-2008        933             16.5         154
  1981 Extension.............................  2008-2011        565               (e)         (e)
  CPC........................................  1990-2009      1,059             29.6         314
  CPC (Badak VI).............................  1998-2017      1,762        21.6/16.5         294
  Osaka (Badak IV)...........................  1994-2013      1,912             27.2         520
  Korean Carryover...........................  1986-2006        130             50.0          65
  Korea II...................................  1994-2014        783             27.2         213
  KGC (Badak V)..............................  1998-2017      1,040        21.6/16.5         177
  MCGC.......................................  1996-2015        336             27.2          92
SHORT-TERM:
  Toho.......................................  1988-2000         12        29.6/27.2           3
  KGC MOA....................................  1995-1999        148             21.6          32
  CPC MOA....................................  1998-1999         46             21.6          10
  KGC MOA....................................  1996-1999        132             21.6          29
  MOA (Aquarius).............................  1997-1999         32             21.6           7
</TABLE>
 
- ---------------
 
(a)  The joint venture's participation percentage is set by Pertamina based upon
     uncommitted reserves of the various production sharing contractors
     supplying gas to the Bontang plant. The participation percentages
     determined by Pertamina apply to new contracts, or amendments or extensions
     of contracts, entered into during certain time periods. During 1996,
     Pertamina set the joint venture's participation percentage at 16.5%, based
     upon the joint venture's uncommitted natural gas reserves certified as of
     April 30, 1995, for the first five and one half years of the 1981
     extension, 2000-2017 period of the CPC (Badak VI) and the KGC (Badak V)
     long-term contracts. For other future sales contracts, including the
     remaining term of the 1981 extension and the final year of the 1973
     extension, the Company cannot predict the participation percentage of the
     joint venture in such contracts, although absent the discovery of
     significant additional gas reserves in the joint venture's contract area,
     the participation percentage is expected to be less than 16.5%.
 
(b)  Those contracts that show two joint venture participation percentages have
     been amended or extended to provide for additional deliveries. The second
     percentage indicates the portion of gas to be supplied under the amendment
     or extension of such contract by the joint venture. The joint venture has a
     97.9% and 27.2% interest in 3 and 364 remaining TBtus, respectively, of the
     total 367 TBtus remaining to be sold under the 1973 contract; a 66.4% and
     29.6% interest in 899 and 95 remaining TBtus, respectively, of the total
     994 TBtus remaining to be sold under the 1981 contract; a 21.6% and 16.5%
     interest in the 49 and 1,713 remaining TBtus, respectively, of the total
     1,762 TBtus remaining to be sold under the CPC (Badak VI) contract; a 21.6%
     and 16.5% interest in the 104 and 936 remaining TBtus, respectively, of the
     total 1,040 TBtus remaining to be sold under the KGC (Badak V) contract;
     and a 29.6% and 27.2% interest in the 0 and 12 remaining TBtus,
     respectively, of the total 12 TBtus remaining to be sold under the Toho
     contract.
 
(c)  The joint venture's share of remaining LNG sales volumes represents volumes
     available to the joint venture under the sales contracts for servicing its
     share of plant operating and debt service costs, as
 
                                       16
<PAGE>   17
 
     applicable, for recovering exploration, development and production costs
     and for profit sharing between the joint venture and Pertamina.
 
(d)  The joint venture's participation in the 1973 extension is 21.6% for the
     period 2000-2009. The joint venture's share of the contracted volumes for
     such period is 943 TBtus. As discussed in footnote (a) above, the joint
     venture's participation in the final year of the 1973 extension has not
     been determined by Pertamina and is not expected before 1999.
 
(e)  As discussed in footnote (a) above, the joint venture's participation in
     the final three years of the 1981 extension has not been determined by
     Pertamina and is not expected before 1999.
 
     In general, the processing and operating costs of the Bontang plant are
charged to each LNG and LPG sales contract during each year based upon the ratio
of the sum of BTUs of LNG and LPG processed by the Bontang plant for each
contract to the total number of BTUs processed by the Bontang plant.
 
     Under the 1973, extended 1973, extended 1981, Korean Carryover, MCGC, CPC,
certain KGC (Badak V) and CPC (Badak VI) long-term contracts and, in general,
the short-term contracts, LNG is sold on a delivered basis (i.e., title and risk
of loss do not pass until the LNG is unloaded at the customers' facilities).
Under the 1981, Osaka, Korea II and the remaining KGC (Badak V) contracts, LNG
is delivered F.O.B. (i.e., title and risk of loss pass upon loading at
Pertamina's port facility). Payments for LNG under all of the LNG sales
contracts are, or will be, made by the purchasers in U.S. dollars directly to a
bank in the U.S. that acts as trustee and paying agent (the "Trustee") with
respect to sales proceeds. Bontang plant processing fees, debt service with
respect to plant financings, transportation (as required) and other costs are
deducted from sales proceeds, and the balance is then distributed to Pertamina,
the members of the joint venture and the other production sharing contractors.
 
     At December 31, 1997, the average LNG price under all contracts supplied
from the Bontang plant was $3.00 per MMBtu, or $3.37 per Mcf, as compared to
$3.62 per MMBtu, or $3.99 per Mcf at December 31, 1996. Prices under the
contracts are subject to monthly adjustments. As of December 31, 1997, January
27, 1998, and February 20, 1998, the average price for the group of crude oils
used to determine the price of LNG was $19.47, $17.50 and $14.75 per Bbl,
respectively. The Company is unable to predict the amount or timing of future
changes in the price of this group of crude oils. Every $1.00 change in the
average of the price of this group of crude oils results in approximately a
$0.17 per Mcf change in the price of LNG.
 
     Pertamina also sells LPG produced at the LPG processing facilities at the
Bontang plant under seven contracts with Japanese purchasers, each of which is
for a ten-year term. In 1997, the Bontang plant delivered an aggregate of up to
1,000,000 metric tons of LPG (7.4 MMboe) per year to support these contracts.
The joint venture currently has 29.6%, 27.2% and 21.6% participations in the gas
processed at the Bontang plant to supply quantities of LPG to be sold under the
LPG contracts. Pertamina may from time to time sell quantities of LPG outside of
the seven LPG contracts, and to the extent that such sales are made, the joint
venture currently will have a 21.6% participation in the gas processed at the
Bontang plant to supply those additional sales. A significant portion of the LPG
sales proceeds from sales under the seven contracts is dedicated to the
repayment of financing of the LPG processing facilities at the Bontang plant.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
  Venezuela
 
     In February 1998, the Company acquired a company which holds an operating
service contract covering 100% of the Desarrollo Zulia Occidental (DZO) unit in
Western Venezuela. In June 1997, the Company led a successful bid to obtain
another operating service contract for the Boqueron contract area in Eastern
Venezuela. With these two service contracts, Venezuela is established as a
significant new operated core area for the Company. Although the Government of
Venezuela retains full ownership of all hydrocarbons, the Company will serve as
a contractor to operate the fields on behalf of the affiliate of the national
oil company, PDVSA. An affiliate of PDVSA has an option to purchase up to a 10%
interest in the contracts for the DZO unit and Boqueron area. Under an operating
service agreement, the contractor is paid a fee based on a
                                       17
<PAGE>   18
 
predetermined formula, which is invoiced quarterly based on barrels of crude oil
produced and receives its payments from the PDVSA affiliate. Invoice amounts and
payments are denominated in U.S. dollars. The Company's interest in the reserves
in Venezuela currently account for over 25% of the Company's total worldwide
reserve base. The Company plans to spend about $79 million in 1998 on
development activities in Venezuela.
 
     DZO Unit
 
     The Company acquired in February 1998 all of the stock of Compania
Occidental de Hidrocarburos, Inc. ("Hidrocarburos"), a U.S. affiliate of
Occidental Oil & Gas Corporation ("Occidental"), for approximately $212 million,
which includes $14 million in working capital and certain closing adjustments
effective as of December 31, 1997. Occidental may receive contingent payments of
up to a maximum of $15 million annually for six years based primarily on the
level of oil prices. Hidrocarburos operates as contractor of the DZO unit
located west of Lake Maracaibo in Western Venezuela under a 20-year operating
service contract with PDVSA Petroleo y Gas S.A. ("PDVSA PyG"), a subsidiary of
PDVSA and the successor to Maraven, S.A. The operating service contract was
awarded to Hidrocarburos during Venezuela's Second Round of Operating Agreements
in 1993 and commenced operations in 1994. Under the provisions of the contract,
the contractor invests capital and provides technology for reactivation of the
fields for which the contractor receives various fees per barrel delivered to
the custody transfer point. The fees received are operating, capital
reimbursement and interest on unrecovered capital costs which are in total
limited by a maximum total fee. The maximum total fee is indexed with a basket
of crude oil products and was approximately $7.50 per barrel in the latter half
of 1997. The Company cannot predict the extent that the future maximum total fee
will limit the operating, interest and capital fees received and recorded.
Additionally, an incremental incentive fee of several dollars per barrel, which
is also indexed to a basket of crude oil products but is not limited by the
maximum total fee, is payable when cumulative production from the DZO unit (from
inception of the 1993 contract) reaches 52 million barrels. Cumulative
production is expected to reach 52 million barrels during the second half of
1999. The contractor does not pay royalties related to the DZO unit. Operating
costs in early 1998 averaged about $2.90 per barrel. The 20-year operating
service contract expires in 2013 and may be extended with the approval of PDVSA
PyG. In 1998, the Company recorded for the DZO unit 114 million barrels of
proved reserves, of which 56 million barrels are classified as proved
undeveloped. The Company anticipates spending $400 to $450 million over the next
nine years for future development expenditures. The Company plans to increase
current production from 23,000 gross barrels a day up to 55,000 gross barrels
within five years.
 
     Boqueron Contract Area
 
     In June 1997, the Company led a successful bid for the Boqueron contract
area under Venezuela's Third Operating Agreement Round. The Company was named
the operator and is a contractor with a 66.67% interest in the contract area and
Preussag Energie GmbH of Germany, the other contractor and a co-venturer, has a
33.33% interest (collectively, the "Contractors"). The Company and Preussag
Energie paid $175 million for the rights to the service contract for the
Boqueron contract area. Under the 20-year contract, the Contractors will operate
and produce oil from Boqueron on behalf of PDVSA PyG, successor to Lagoven,
S.A., which currently serves as operator. The Company expects to assume
operatorship in May 1998, pending approval of its development plan which was
filed in January 1998. The Contractors are compensated a U.S. dollar service fee
to cover reimbursement of costs plus profit. There are two components of the
fee, which include (i) a set fee for baseline production and (ii) a fee for
incremental production. PDVSA PyG will pay the Contractors a set fee of $1.25
per barrel for operating the baseline production. In the Boqueron contract area,
the baseline production initial rate is estimated at 8,500 gross barrels per day
with a nominal annual decline rate of 10%. In terms of the incremental
production, the Contractors will be paid a sliding incentive fee based on field
profitability and will be allowed to recover field and other capital and
operating costs through the fee mechanism. The field profitability is based on
production at world market prices net of a 1/6 government royalty and field
costs. The Company recorded approximately 40 million net barrels in proved
reserves from the Boqueron contract area during 1997 with additional reserves
expected to be recorded in the future as the field is further developed. The
Contractors must invest at least $13 million over the next three years and
currently expect to spend between $300 million to $325 million in the area over
the next five years. With this
                                       18
<PAGE>   19
 
additional development spending, the Company expects to increase current
production at the Boqueron contract area from 8,500 gross barrels of oil a day
to a rate of 50,000 to 60,000 gross barrels within three to five years.
 
     Other Information. Income from the DZO unit and Boqueron contract area is
subject to Venezuelan income tax at 34%. In addition, each Venezuelan
municipality levies a tax on gross income at varying rates. Under the DZO unit
service contract, municipal tax is considered a capital expenditure subject to
reimbursement as part of the capital fee reimbursement. Under the Boqueron
contract area service contract, municipal tax in excess of 4% is reimbursed by
PDVSA PyG and municipal tax up to 4% is deductible for Venezuela income tax
purposes.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
  Pakistan
 
     Badin Concessions
 
     Since 1977, the Company has operated through joint ventures oil and gas
exploration, production and development activities in the Badin area of the
Sindh Province in southeastern Pakistan. The Company's activities are conducted
under three concession agreements.
 
     1977 Concession. In April 1977, the Pakistan government granted exploration
rights in the Badin area to the Company and its co-venturers (the "1977
concession"). The Company is the operator of a joint venture that includes the
Oil and Gas Development Corporation, a Pakistan government-owned company. The
oil and gas reserves discovered under the 1977 concession continue to be
produced under leases granted by the Pakistan government. The terms of such
leases are 30 years from the date that they were first granted. The Company has
a 30% working interest (26.25% revenue interest) in the 1977 concession area.
 
     1992 Concession. In 1992, the joint venture was granted a three-year
extension of the exploration license that it originally received in 1977 (the
"1992 concession"). The oil and gas reserves discovered under the 1992
concession are produced under 20-year leases granted or pending approval by the
Pakistan government. Production from the 1992 concession began during 1995. The
Company has a 25.5% working interest (22.3% revenue interest) in the 1992
concession area.
 
     1995 Concession. The exploration license granted by the Pakistan government
in 1992 under the 1992 concession expired in January 1995 as to 1.6 million
acres in the Badin area not covered by leases granted or pending approval under
the 1977 concession and 1992 concession. In December 1994, the joint venture and
the Pakistan government signed a new petroleum concession agreement covering
such acreage (the "1995 concession"). The oil and gas reserves discovered under
the 1995 concession are produced under 20-year leases granted or pending
approval by the Pakistan government. Production from the 1995 concession began
during 1996. The Company has or will have a 25.5% working interest (22.3%
revenue interest), provided the Pakistan government elects to exercise its
option to increase its working interest in each such discovery to 25%. The
exploration license granted under the 1995 concession expired in January 1998 as
to all but 8,188 acres covered by leases granted or applied for under the 1995
concession and other areas subject to ongoing operations at the expiration of
the 1995 concession. The joint venture has reapplied for an exploration license
for the relinquished acreage.
 
     The Pakistan government is contractually obligated under the 1977, 1992 and
1995 concession agreements to issue leases upon the determination of a
commercial discovery and the fulfillment by the joint venture of the conditions
of the concession agreements and the exploration license.
 
     Proved reserves (net) at December 31, 1997, for the Company's interest in
the Badin concessions were 6 MMBbls of oil and 120 Bcf of gas. The joint venture
under these concessions produced approximately 45% of Pakistan's total domestic
oil output and 8% of the country's gas production in 1997. Average daily
production (net to the Company) during 1997 was 7 MBbls of oil and 37 MMcf of
gas as compared to 6.2 MBbls of oil and 41.4 MMcf of gas in 1996 with the
decline primarily due to lower gas demand and market
 
                                       19
<PAGE>   20
 
constraints in Pakistan. The Company's share of the oil produced from the 1977
and 1992 concessions is sold for both Pakistan domestic use and for export. The
price received for oil sold domestically is tied to the average spot market
price of Middle Eastern crude oil. In 1997, the Company supplied 1.47 MMBbl of
oil (net to the Company) for export at prices based on competitive spot market
rates. The Company and its co-venturers sell natural gas produced from the 1977
concession area to Sui Southern Gas Company, Ltd. ("SSGC"), a Pakistan
government-owned entity. The contract expires in 2003 and provides that SSGC
must either take or pay for the contracted quantities of natural gas. Natural
gas produced from the 1992 concession area is also sold, and natural gas
produced from the 1995 concession is expected to be sold, to SSGC under a
contract with terms similar to the SSGC contract covering production from the
1977 concession.
 
     During 1997, the Company drilled seven exploratory wells in the Badin
concessions, three of which were discoveries. During 1998, the Company plans to
drill up to nine exploration wells and up to eight development wells in the
Badin concessions.
 
     Eastern Sindh Concessions
 
     In April 1995, the Company signed a concession agreement with the Pakistan
government covering 1.8 million acres in the Eastern Sindh block in the Sindh
Province of southeastern Pakistan for which the Company was granted an
exploration license in December 1994. The concession agreement and the
exploration license provide the Company with the right to explore for oil and
gas for an initial period of three years, with an option for three extensions of
one year each, and upon a commercial discovery, the right to apply for a 20-year
lease with the Pakistan government. The Company is the operator and has a 70%
working interest in the concession and exploration license, which is subject to
reduction if the Pakistan government elects to participate upon discovery of
commercial production. In 1997, the initial exploration well was unsuccessful.
In December 1997, the Pakistan government granted a six-month extension to the
initial three-year term of the concession and exploration license in order for
the Company to complete the analysis on the well as well as an aeromagnetic
survey on the block. Additionally, in October 1997, the Company signed two
concession agreements with the Pakistan government covering approximately 1.2
million acres in the Khinsar block and 1 million acres in the Umer Kot block,
located along the eastern boundary and western boundary, respectively, of the
Eastern Sindh Concession in the Sindh province of Pakistan.
 
     On November 12, 1997, five of the Company's employees were killed in an
attack by unknown assailants in Karachi, Pakistan. The Federal Bureau of
Investigation and the government of Pakistan are investigating the tragedy.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
  Alaska
 
     The Company pursues development and exploration projects in Alaska. At
year-end 1997, the Company held acreage primarily in Western Colville, the Kenai
Peninsula and offshore northeast Alaska in the Beaufort Sea.
 
     Western Colville. The Company and its co-venturers are developing the
Alpine oil field in the Western Colville area on Alaska's North Slope 34 miles
west of the Kuparuk River oil field. ARCO Alaska, Inc., the operator, Anadarko
Petroleum and the Company have a 56%, 22% and 22% working interest in Alpine,
respectively. Partner project approval was obtained in June 1997 and in February
1998 permits were issued by the U.S. Army Corps of Engineers allowing field
construction and development activities to proceed as planned. Production from
Alpine is scheduled to begin the first part of 2000 at an anticipated initial
rate of 40,000 barrels of oil per day gross, with peak production of 70,000
barrels per day gross in 2001. The field is expected to produce for about 25
years. Oil from Alpine will be moved to market through a new 34-mile pipeline
that is under construction and will connect Alpine to the Trans Alaska Pipeline
via the Kuparuk pipeline system. As of December 31, 1997, proved undeveloped
reserves (net) for the Alpine field were 32 MMBbls. The Company anticipates
recording additional proved reserves based on the field's development drilling
and future production performance. Development of the Alpine field is expected
to cost $650 million
                                       20
<PAGE>   21
 
gross. The Company's estimated total share of development costs for its interest
in Alpine is $143 million from 1997 to 2002. As of December 31, 1997, the
Company has spent $9 million for initial development activities and expects to
spend approximately $50 million in 1998. The three companies were the high
bidders on 23 new leases covering 46,643 gross acres in the Colville area at the
lease sale held in November 1997 by the State of Alaska. Also in November 1997
at such lease sale, the Company was the high bidder on four new leases covering
approximately 13,104 gross acres located northeast in the Colville area. Three
exploration wells and two development wells are planned in the Colville area
during the winter season of 1998.
 
     Kenai Peninsula. Effective November 1, 1993, the Company entered into an
exploration agreement with Cook Inlet Region, Inc. ("CIRI"), an Alaska Native
Regional Corporation. Under the agreement, the Company will bear 100% of the
exploration costs and may acquire leases on prospects identified, subject to
CIRI's option to participate in the leases and the exploration, drilling and
development of such prospects. As of February 1, 1998, the Company has
approximately 37,354 gross and 32,928 net acres under lease on the Kenai
Peninsula. The Company plans to drill one well in 1998 subject to gas marketing
arrangements which are currently under negotiation and are expected to be
finalized in the first part of 1998.
 
     Kuvlum/Hammerhead. In January 1998, the Company, Chevron U.S.A., Inc. and
Shell Frontier Oil & Gas, Inc. signed an agreement that established Chevron as
operator of the Kuvlum and Hammerhead federal exploratory oil and gas units in
the Beaufort Sea offshore northern Alaska. The Company and Shell each will have
a 20% working interest in every lease in both units pending government approval.
The companies are working with the Minerals Management Service to pursue a
development plan that would include potential joint development for Eastern
Beaufort Sea and North Slope discoveries.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
  Other Activities
 
     In addition to the activities described above, the Company conducts
evaluations as well as undertakes exploration activities worldwide to expand its
reserve base. The Company has budgeted a total of $82 million for exploration
activities during 1998, $23 million of which will be spent in the U.K.,
Indonesia and Pakistan and $59 million in new ventures, including primarily the
activities described below. The Company is also pursuing downstream
opportunities in Pakistan, Indonesia and Latin America, including LPG and
petrochemical projects.
 
     China. In 1997, the Company acquired a 40% interest in a 2.27 million acre
exploration block, known as Contract Area 11/05, in Bohai Bay offshore the
People's Republic of China from a subsidiary of Phillips Petroleum Company,
which serves as operator and holds the remaining 60% interest. China National
Offshore Oil Corp. ("CNOOC") has the right to acquire up to 51% interest in any
proposed development. During 1997, the joint venture drilled two exploration
wells, which were oil discoveries. A third well drilled in early 1998 was
unsuccessful. During 1998, the joint venture plans to gather more seismic data
and drill a fourth well in late 1998 or 1999.
 
     Algeria. In 1997, the Company acquired a 30% interest in two blocks in the
Ghadames Basin in Algeria from a subsidiary of Phillips Petroleum Company, which
serves as operator and holds the remaining 70% working interest. The Bordj
Messouda Blocks 406B and 209 comprise a total of 1.5 million acres and are
located in southeastern Algeria. The first exploration well drilled in 1997 was
unsuccessful and the joint venture plans to drill a second well in the first
half of 1998.
 
     Tunisia. In October 1997, the Company announced that it acquired a 25%
working interest in an exploration venture in the Ghadames Basin in southwestern
Tunisia. The Company acquired its interest in the 1.44 million acre Borj El
Khadra block from a subsidiary of Phillips Petroleum Company, which serves as
operator and has a 25% interest in the block. LASMO Tunisia B.V. is also a
partner in the venture with a 50% working interest. In the event that a
discovery is developed, L'Enterprise Tunisienne d'Activites Petrolieres
("ETAP"), the Tunisian national oil company, has the right to participate for up
to a 50% working interest, thereby reducing each co-venturer's working interest
in half, assuming full participation by ETAP. About
 
                                       21
<PAGE>   22
 
1,500 kilometers of 2-D seismic data have been acquired over the block, where
the venture plans to drill an exploration well in 1999. The joint venture plans
to participate in geological studies during 1998. The Borj El Khadra block is
adjacent to the Bordj Messouda block in Algeria.
 
     The Company has an oil and gas exploration permit on the one-million-acre
Ramla block offshore southeast Tunisia in the Gulf of Gabes. The Company serves
as operator and bears 50% of the exploration costs. In the event of a commercial
discovery, the Tunisian national oil company has the right to participate for up
to a 50% working interest. The permit expires in January 1999. The initial
exploration well was non-commercial. A second well commenced drilling in early
1998.
 
     The Company also has a 65% working interest in the onshore Jeffara
exploration permit, which covers 970,000 acres in the Medenine Region of
southeastern Tunisia. The Company's interest is subject to the Tunisian national
oil company's right to participate for up to a 50% working interest in the event
of a commercial discovery. The Jeffara exploration permit, which is operated by
the Company, has been extended through 1998. An exploration well drilled in 1997
was unsuccessful.
 
     Bolivia. The Company has a 20% interest in the 1.6 million acre exploration
block operated by Maxus/YPF known as the Caipipendi block in the Southern
Foothills Belt. A deep exploratory well commenced drilling in 1997 and is
currently drilling. During 1998, the joint venture also plans to acquire seismic
data over the block and possibly drill another well.
 
     Italy. The Company had interests in a total of 385,668 gross (137,313 net)
acres in the Southern Apennines oil play onshore southern Italy at the end of
1997. In 1996, the Company acquired interests in three onshore exploration
permits in the Basilicata Region covering approximately 100,630 gross (25,158
net) acres in this play. The Company holds a 50% working interest in each
permit. Triton Mediterranean Oil and Gas N.V. serves as operator. In 1995, the
Company acquired interests in three onshore exploration permits covering 216,000
gross acres in the same region. The Company serves as operator of and holds an
82% working interest in the Serra Corneta permit. The Company also holds a
33.33% working interest in the Tempa dei Mercanti permit, operated by Edison
Gas, and a 20% working interest in the Forenza permit, operated by LASMO
International Limited. Geological and seismic studies on the six permit areas
were conducted in 1996 and 1997 and will continue in 1998. In 1995 the Company
also acquired a 20% working interest in the onshore Baragiano permit, which
covers about 68,913 gross acres in the Basilicata Region, from Enterprise Oil
Exploration Ltd. ("Enterprise"). Enterprise serves as operator. The Baragiano
permit's first exploration well was unsuccessful.
 
     Kazakhstan/Caspian Sea Area. In May 1997, the Company formed a joint
venture with Oman Oil Company Limited ("Oman Oil") to explore for, develop and
produce oil and gas in two blocks, A and E, covering four million acres onshore
Kazakhstan and offshore in the Kazakhstan sector of the Caspian Sea. The Company
will serve as operator of the new venture and owns a 75% interest. Oman Oil, a
state-owned project development company of Oman, retains a 25% interest. The
joint venture has preferential rights to select two offshore blocks in the
Kazakhstan sector of the Caspian Sea. During 1998, the joint venture plans to
study seismic data acquired during 1997 and start a preliminary evaluation of
the onshore area, as well as select offshore blocks in the next bid round
procedure. The Company is also pursuing opportunities onshore Azerbaijan.
 
     U.K. and Ireland. In 1997, the Company was awarded a 25% working interest
in four offshore blocks (Tranche 36) covering 212,000 acres, in the U.K. Rockall
basin located about 125 miles northwest of Scotland. The joint venture, operated
by Texaco Britain Limited, was granted an exploration license for an initial
three-year period and a seismic acquisition program was conducted immediately
following license award. The Company was also awarded a 25% interest in four
full and two part blocks, comprising 245,000 acres, in the Irish Rockall basin
about 80 miles northwest of Ireland. This exploration license, operated by
Enterprise Oil plc, is for a 16-year period divided into four-year intervals.
The Company acquired seismic data in 1997, and the joint venture plans to
process and evaluate such data during 1998.
 
     The Company has a 25% working and revenue interest in two full and one part
offshore blocks encompassing 163,000 acres in St. George's Channel offshore
Ireland operated by Marathon Oil Company
 
                                       22
<PAGE>   23
 
("Marathon"). The Company also has a 15% working and revenue interest in eight
offshore blocks covering 400,000 acres in St. George's Channel offshore Western
England operated by Marathon. This acreage contains a small gas discovery.
Although initial exploration wells were unsuccessful, during 1998, the Company
plans to evaluate seismic data on these blocks.
 
     The Company has a 15% working and revenue interest in five and one half
blocks covering 344,000 acres offshore southwest Ireland in the Porcupine basin
and a 30% working and revenue interest in 11 blocks offshore west Ireland that
cover 650,000 acres in the Slyne/Erris basins. Each joint venture, operated by
Statoil (U.K.) Ltd., was granted a license to explore for oil and natural gas
for a 15-year and 16-year period, subject to certain minimum work requirements
at three-year and four-year intervals, respectively. The licenses have been
extended for another interval and the joint ventures continue to conduct
additional geological and geophysical studies.
 
     Other. In 1998, the Company plans to participate in several new exploration
venture areas, including up to two exploration wells in Yemen and seismic
studies in Egypt, onshore Greece, Jordan, onshore and offshore Papua New Guinea,
Sicily and offshore Trinidad. The Company is also pursuing opportunities in
additional new exploration ventures, including the Middle East, Central Asia,
Latin America and Africa.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
PETROCHEMICALS
 
     Plant Operations. The Company's petrochemical business consists primarily
of the Company's 41.67% interest in the jointly owned Geismar olefins plant
located on the Mississippi River near Baton Rouge, Louisiana. The joint owners
are BASF Corporation with a 41.67% interest and GE Petrochemicals, Inc. with a
16.66% interest. The plant began operations in 1968. The Company operates the
plant, with production costs and plant production being shared by the three
joint owners according to their ownership interests. With completion of the
thirteenth furnace in December 1997 that increased capacity by about 26 million
gross pounds, the plant has the capacity to produce approximately 1.275 billion
gross pounds (531 million net) of ethylene and 92 million gross pounds (38
million net) of polymer-grade propylene annually. An upgrade of the nine
original furnaces began in the first quarter of 1998 and is expected to be
completed in February 1999. The total cost of the new furnace and upgrading
project is estimated to be approximately $27.8 million gross ($11.6 million net
to the Company).
 
     In 1997, which included a two-week scheduled turnaround, and 1996, the
Company's net ethylene sales were 475 million pounds and 510 million pounds,
respectively, and its net propylene sales were 30 million pounds and 34 million
pounds, respectively. The Company sells its share of the ethylene and propylene
produced by the plant to a number of major customers for the manufacture of
plastics used in various consumer products. The sales price of ethylene averaged
$0.24 per pound in 1997 and $0.22 per pound in 1996. Sales of propylene, used in
the manufacture of various products such as building materials, clothing and
tires, averaged $0.18 per pound and $0.16 per pound in 1997 and 1996,
respectively.
 
     During 1997, the average margin per pound of the Company's ethylene was
$0.09 per pound as compared to $0.06 per pound for 1996. The Company's ethylene
margin is primarily affected by the price received for the ethylene and the cost
of feedstock (natural gas liquids) and natural gas.
 
     Storage and Transportation. In addition to the Geismar plant, the Company
owns and operates a 192-mile ethane feedstock pipeline system, which transports
feedstock to its olefins plant from several major suppliers, including the
Company's natural gas liquids fractionation plant and supporting 133-mile
pipeline system in Rayne, Louisiana. The Company plans to extend this system in
1998 to expand the Company's market capability for transporting ethane. The
Company is also committed to participate in a pipeline connection to a gas
liquids fractionator in Napoleonville, Louisiana, which has access to new
natural gas liquids (feedstocks) associated with new Gulf of Mexico gas
production. The Company also operates
 
                                       23
<PAGE>   24
 
underground storage terminals and a 78-mile ethylene pipeline system, portions
of which are jointly owned, to serve the Geismar facility and several other
petrochemical plants primarily in the Baton Rouge area.
 
     Capital expenditures for the petrochemical business were $29 million (net
to the Company) during 1997. The Company plans to spend $39 million (net to the
Company) in capital expenditures for the petrochemical business during 1998,
which include costs for the expansion and enhancement of its supply and
distribution system and preliminary engineering for a capacity upgrade for the
Geismar olefins plant, as well as other projects to enhance production, safety
and efficiency. The Company continues to study opportunities to expand and add
value to its petrochemicals business.
 
     See "-- Risk Factors" and Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations.
 
OTHER MATTERS
 
     Insurance. As is customary in the oil and gas and petrochemical industries,
the Company reviews its safety equipment and procedures and carries insurance
against some, but not all, risks of the business. See "Risk Factors." Losses and
liabilities would reduce revenues and increase costs to the Company to the
extent not covered by insurance. The oil and gas and petrochemical businesses
can be hazardous, involving unforeseen circumstances such as blowouts,
explosions or environmental damage. To address the hazards inherent in the oil
and gas and petrochemical businesses, the Company maintains a comprehensive
insurance program covering its worldwide interests. This insurance coverage
includes physical damage coverage, third party general liability insurance,
employers liability, as well as redrill, well control, environmental and
pollution and other coverage, although coverage for environmental and
pollution-related losses is subject to significant limitations. In addition, the
Company maintains business interruption insurance on its major international oil
and gas producing interests and on its petrochemical business. The scope, terms,
retentions, amount and cost of all such insurances vary depending upon various
market factors and other considerations.
 
     Employees. As of February 20, 1998, the Company had approximately 1,300
employees. The Company believes that its relations with its employees are good.
 
RISK FACTORS
 
     Forward-Looking Statements. All statements other than statements of
historical fact contained in this report, including statements in Item
7 -- Management's Discussion and Analysis of Financial Condition and Results of
Operations are forward-looking statements. When used herein, the words "budget,"
"anticipate," "expects," "believes," "seeks," "goals," "plans," "strategy,"
"intends," or "projects" and similar expressions are intended to identify
forward-looking statements. It is important to note that the Company's actual
results could differ materially from those projected by such forward-looking
statements and no assurance can be given that the expectations will prove
correct. In reliance upon the Private Securities Litigation Reform Act of 1995,
factors identified by the Company that could cause the Company's future results
to differ materially from the results discussed in such forward-looking
statements include the following risks described under "Risk Factors." All
forward-looking statements in this report are expressly qualified in their
entirety by the cautionary statements in this paragraph and shall be deemed in
the future to be modified in their entirety by the Company's public
pronouncements, including those contained in all future reports and other
documents filed by the Company with the Securities and Exchange Commission.
 
     Volatility of Prices and Availability of Markets. The Company's revenues,
profitability and future rate of growth are highly dependent upon the prices of
and demand for oil and gas, which can be extremely volatile. The volatile energy
market makes it difficult to estimate future prices, service fees and sales
volumes of natural gas, crude oil and LNG, which are affected by a number of
factors beyond the control of the Company, including worldwide supplies of and
demand for oil and gas, changing international economic and political
conditions, such as the current Asian economic crisis, contract enforceability,
insolvency of other parties, domestic and foreign energy legislation, weather,
environmental conditions, regulations and events, and actions of major petroleum
producers including members of the Organization of Petroleum Exporting
Countries. If oil prices decline, the price or service fee for a significant
portion of the natural gas and oil
                                       24
<PAGE>   25
 
produced from the Company's properties, including the sales price for LNG, will
also decline. The Company's Venezuelan revenues are based on a fee adjusted
quarterly by the percentage change of a basket of crude oil product prices
instead of absolute dollar changes, which impacts both any upward and downward
effects of changing prices on the Company's Venezuelan revenues and cash flows.
If the price of oil increases, there could be an increase in the cost to the
Company for drilling and related services with escalating equipment and labor
costs because of increased demand, as well as increase in revenues. The ethylene
business is cyclical and the Company cannot predict the duration of any trends
in the business. The Company's ethylene margins have averaged approximately
$0.09, $0.06 and $0.13 during 1997, 1996 and 1995, respectively. The marketing
and prices received by the Company for its ethylene petrochemical business are
affected by worldwide and U.S. demand for petrochemicals, inventory levels,
feedstock costs and availability, plant utilization rates, plant operations and
costs and competitive capacity expansion. The marketability of the Company's
natural gas, crude oil, LNG and ethylene production depends in part upon the
availability, proximity and capacity of gathering systems and processing
facilities. The Company's financial condition, operating results and liquidity
may be materially affected by any significant fluctuations in its sales prices.
The Company's ability to implement its business strategy and service its
long-term obligations and to generate funds for capital expenditures will be
similarly affected.
 
     Business Risks. The Company's activities are subject to the risks normally
associated with oil and gas operations and petrochemical operations. The nature
of the oil and gas business involves a variety of risks usually associated with
exploration for, and development, production and transportation of, oil and gas,
including blowouts, cratering, oil spills, fires, geologic uncertainties and
adverse or seasonal weather conditions. Offshore operations are also subject to
marine perils and extensive governmental regulations, as well as interruption or
termination by governmental authorities based on environmental or other
considerations. The Company's operations, including its petrochemical
operations, are subject to certain additional risks, including the breakdown or
failure of equipment, downtime of production units due to turnarounds, the
performance of equipment at levels below those originally projected, and
explosions, fires, floods and other catastrophic events. In certain cases, the
Company is also at risk in regards to any interruptions in related facilities,
which are not under its control. For example, in Indonesia, the Bontang plant's
ability to manufacture and ship quantities of LNG is dependent upon the
continued operation of the Bontang plant without mechanical failure and without
the shutdown of any processing units in excess of scheduled maintenance periods.
The sale of LNG is also dependent upon the availability of shipping without
interruption and upon the continued operation or timely construction of the
buyers receiving terminals. The costs associated with transportation of certain
products, including LNG, such as repair and maintenance or replacement of LNG
tankers, are beyond the control of the Company. The occurrence of any of these
events could cause injury to life or property, interruptions in operations,
failure to produce oil or gas in commercial quantities, inability to fully
produce discovered reserves, loss of revenues and margins or increases in the
costs of operations.
 
     Uncertainties in Reserve Estimation, Production Success and Reserve
Replacement. There are numerous uncertainties inherent in estimating quantities
of reserves and in projecting future rates of production and timing of
development expenditures, including many factors beyond the control of the
producer. The reserve data set forth in this report represent only estimates.
Underground accumulations of oil and gas cannot be measured in an exact way. The
accuracy of any reserve estimate is a function of the quality and quantity of
available data and of engineering and geological interpretation and judgment. As
a result, estimates by different engineers often vary. In addition, results of
drilling, testing and production subsequent to the date of an estimate may
justify revision of such estimate. Accordingly, reserve estimates at a specific
point in time are often different from the quantities of oil and gas that are
ultimately recovered, which differences may be significant. Additionally, the
estimates of future net revenues from proved reserves of the Company and the
present value of future net revenues are based upon certain assumptions about
future production levels, prices, costs and Venezuelan service fees that may not
prove correct over time. The meaningfulness of such estimates is highly
dependent upon the assumptions upon which they were based.
 
     In general, the Company's volume of production from oil and gas properties
declines with the passage of time. Except to the extent the Company conducts
successful exploration or development activities or acquires
 
                                       25
<PAGE>   26
 
additional properties containing proved reserves, or both, the proved reserves
of the Company, and the revenues generated from production thereof (assuming no
price increases), will decline as reserves are produced. Drilling activities are
expensive and subject to numerous risks, including the risk that no commercially
viable oil or gas production will be obtained. The decision to purchase a
property interest or explore or develop a property will depend in part on
geophysical and geological analysis and engineering studies, the results of
which may be inconclusive or subject to varying interpretations. The cost of
drilling, completing and operating wells is often uncertain. Drilling may be
curtailed, delayed or canceled as a result of many factors, including
availability or high cost of rigs and labor due to increased demand, title
problems, project approvals by joint venture partners, weather conditions,
government regulations, shortages or delays in obtaining equipment, and
limitations in the transportation, storage or market for products. No assurance
can be given that wells will be able to sustain production rates commensurate
with the drill stem tests. Increases or decreases in prices of oil and gas and
in cost levels, along with the timing of development projects, will also affect
revenues generated by the Company and the present value of estimated future net
cash flows from its properties. Revenues generated from future activities of the
Company are highly dependent upon the level of success in finding, developing or
acquiring additional reserves.
 
     For the Company's reserves in Indonesia, the reserve estimates, which are
based on year-end prices, for the Company's net interest in the production
sharing contract are subject to revision as product prices and costs fluctuate
due to the cost recovery feature under the contract. The impact on reserves is
inversely related to price changes and directly related to changes in field
operating and capital costs. In addition, reserves are subject to revision due
to the effect that price fluctuations generally have on estimates of recoverable
reserves. See Note 19 of Notes to Consolidated Financial Statements. The
Company's right to receive revenues under its future new sales contracts or
extensions of renewals of existing contracts is affected by the gas supply
obligation in support of such contracts among the joint venture and other
production sharing contractors. The allocation to the Company's joint venture in
such contracts has declined significantly over time. Because a substantial
portion of the joint venture's reserves of natural gas has been committed to
support existing LNG sales contracts, the Company expects that absent the
discovery of significant additional natural gas reserves in the joint venture's
contract area, the joint venture's participation in future new sales contracts
for LNG and LPG, or in extensions or renewals of existing long-term contracts,
will be less than its current participation in existing contracts.
 
     Governmental Actions, Regulation and Taxation. Petroleum and petrochemical
operations are subject to various types of regulation throughout the world. The
Company believes that its operations and facilities are in general compliance
with existing regulations. Nevertheless, the risks of substantive costs and
liabilities are inherent in operations such as the Company's, and there can be
no assurance that significant costs and liabilities will not be incurred in the
future. Legislation affecting these businesses is under regular review for
amendment or expansion, frequently increasing the regulatory burden. For
example, statutes and regulations require permits for drilling operations,
drilling bonds and reports concerning operations. Also, numerous departments and
agencies are authorized by statute to issue and have issued rules and
regulations binding on the oil and gas industry, the petrochemicals industry and
individual members of these industries. Such rules and regulations pose
difficult and costly compliance and reporting requirements, some of which carry
substantial penalties for the failure to comply. Most of the foreign countries
in which the Company operates have statutes and regulations governing the
Company's operations, including the unitization or pooling of oil and gas
properties, rates of production from oil and gas wells and taxation of sales and
production. The regulatory burden on the oil and gas industry and the
petrochemical industry increases the costs of doing business and, consequently,
affects profitability.
 
     The Company's international operations are subject to certain risks,
including expropriation of assets, joint and several liability with co-venturers
under government contracts, governmental reinterpretation of applicable laws and
contract terms, increases in or assessments of taxes and government royalties,
renegotiation of contracts with governments or customers, government approvals
of lease, permit or similar applications and of exploration and development
plans, political and economic instability, such as the current Asian economic
crisis, guerilla activity, acts of terrorism, disputes between governments,
payment delays, export and import restrictions, limits on allowable levels of
exploration and production and currency shortages,
 
                                       26
<PAGE>   27
 
currency rate fluctuations, exchange losses and repatriation restrictions, as
well as changes in laws and policies governing operations of companies with
overseas operations, including more strict environmental regulation. In
addition, in the event of a dispute arising from foreign operations, the Company
may be subject to the exclusive jurisdiction of foreign courts or may not be
successful in subjecting foreign persons to the jurisdiction of courts in the
U.S. The Company may also be hindered or prevented from enforcing its rights
with respect to a governmental instrumentality because of the doctrine of
sovereign immunity. Foreign operations and investments may also be subject to
laws and policies of the U.S. affecting foreign commerce and trade, investment
and taxation, including but not limited to credibility of foreign taxes and the
imposition of economic sanctions, that could affect the conduct and
profitability of those operations.
 
     Competition. The Company operates in a highly competitive environment. The
Company actively competes with major and independent energy companies for
exploration leases, licenses, concessions and acquisitions of desirable
properties as well as for the equipment and labor required to develop and
operate such properties and market the products produced. Likewise, the Company
competes with other large domestic producers of ethylene in product price,
product quality, product deliverability and production capacity. Many of these
competitors have greater financial and other resources, such as technical
capabilities and human resources, substantially greater than those of the
Company. In addition, some of the Company's competitors have greater experience,
especially in certain international areas where the Company is currently seeking
to acquire interests or expand production capacity.
 
     Environmental. Various international, federal, state and local laws and
regulations, including the preparation of environmental assessments and impact
studies that can delay drilling activity as well as covering the discharge of
materials, or otherwise relating to the protection of the environment, and
private environmental organizations, affect the Company's operations and costs.
In particular, the Company's petrochemical wastes are subject to stringent
environmental regulations relating to, among other things, solid and hazardous
waste management and disposal, air emissions, waste water treatment and other
matters that may affect the environment. Environmental regulations may have an
increasing impact upon the Company's operations. The Company is committed to
managing its operations in a safe and environmentally responsible manner and
believes that its operations and facilities are in general compliance with
applicable environmental regulations. Environmental capital expenditures for
1997 were not material, nor are they expected to be material during 1998.
Nevertheless, the risks of substantial costs and liabilities are inherent in
operations such as the Company's. There can be no assurance that significant
costs and liabilities will not be incurred by the Company in the future.
 
     The Company has, in the past, owned, leased or operated numerous properties
in the U.S. that have been used for the production of oil and gas for many years
and currently participates in exploration and development activities in Alaska.
Although the Company believes that its past operating and disposal practices
were standard in the industry at the time and were generally in compliance with
then-existing rules and regulations, certain wastes may have been disposed of or
released or contamination may have occurred on or under the properties owned,
leased or operated by the Company. State and federal laws applicable to oil and
gas wastes and properties have gradually become more strict. In addition, the
Comprehensive Environmental Response, Compensation and Liability Act ("CERCLA"),
also known as the "superfund" law, and comparable state laws impose liability,
without regard to fault or the legality of the original conduct, on certain
classes of persons that have contributed to the release of a "hazardous
substance" into the environment. Under these laws, the Company could be required
with respect to past, existing and future properties, to remove or remediate
previously disposed of wastes or property contamination (including groundwater
contamination at onshore locations), to perform remedial plugging operations to
prevent future contamination or to clean up disposal sites where "hazardous
substances" from its operations have been taken.
 
     The Company's foreign operations are similarly subject to foreign laws
covering environmental and worker safety matters. The Company's operations in
the U.K. are subject to the Prevention of Oil Pollution Act, the Environmental
Protection Act and related statutes and orders, as well as certain regulations
of the European Union. As a contractor in Venezuela, the Company submits capital
and operating budgets to the affiliate of PDVSA, which then obtains such permits
from the Ministry of Energy and Mines and Ministry of
 
                                       27
<PAGE>   28
 
Environment, as required. The foreign laws, however, have not had, and are not
presently expected to have, a material adverse effect on the Company's financial
statements.
 
     Hedging. The Company may enter into hedging contracts from time to time in
order to minimize the impact of adverse price fluctuations, including futures
contracts. To the extent the Company engages in such activities it may be
prevented from realizing the benefits of price increases above the levels of the
hedges. Risks related to hedging activities include the risk that counter
parties to hedge transactions will default on obligations to the Company. There
are also foreign exchange risks inherent in operations such as the Company's.
The Company's revenues are predominantly based upon the world market price for
crude oil, which is denominated in U.S. dollars. The functional currency for
translating the accounts of the Company's foreign subsidiaries is the U.S.
dollar, except for subsidiaries in the U.K. where the functional currency is
pounds sterling. Certain operating costs, taxes, capital costs and intercompany
transactions represent commitments settled in foreign currency. The Company
periodically enters into foreign exchange contracts as a hedge against
fluctuations in foreign currency rates. The operator of the Company's Indonesian
joint venture has entered into certain such contracts to hedge the Indonesian
Rupiah for purposes of its local payroll obligations, which are not a material
amount to the Company. The Company cannot predict with any certainty the results
of currency exchange rate fluctuations. See Item 7 -- Management's Discussion
and Analysis of Financial Condition and Results of Operations.
 
ITEM 2. PROPERTIES.
 
     For a description of the Company's properties, see Item 1 of Part I of this
Annual Report on Form 10-K.
 
ITEM 3. LEGAL PROCEEDINGS.
 
     The Company and its subsidiaries and related entities are named defendants
in numerous lawsuits and named parties in numerous governmental proceedings
arising in the ordinary course of business.
 
     While the outcome of the contingencies, lawsuits or other proceedings
against the Company cannot be predicted with certainty, management expects that
such liability, to the extent not provided for through insurance or otherwise,
will not have a material adverse effect on the financial statements of the
Company. See Item 1 -- Business -- Risk Factors.
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
 
     No matters were submitted to stockholders' vote during the fourth quarter
of the fiscal year ended December 31, 1997.
 
                                       28
<PAGE>   29
 
                                    PART II
 
ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS.
 
     Since September 24, 1987, the Company's common stock, $.05 par value (the
"Common Stock"), has been traded on the New York Stock Exchange and the Pacific
Exchange under the symbol "UTH." As of February 20, 1998, there were
approximately 85,161,652 shares of Common Stock outstanding held by
approximately 305 stockholders of record. Beginning with the second quarter of
1988, the Company has paid regular quarterly dividends on the Common Stock of
$.05 per share each quarter. See Item 7 -- Management's Discussion and Analysis
of Financial Condition and Results of Operations.
 
     The following table shows the high and low sales prices of the Common Stock
from the New York Stock Exchange Composite Transactions Tape for 1997 and 1996:
<TABLE>
<CAPTION>
                                               1997                                         1996
                       -----------------------------------------------------       -----------------------
                                           QUARTER ENDED                                QUARTER ENDED
                       -----------------------------------------------------       -----------------------
                       MARCH 31       JUNE 30        SEPT. 30       DEC. 31        MARCH 31       JUNE 30
                       --------       -------        --------       -------        --------       -------
<S>                    <C>            <C>            <C>            <C>            <C>            <C>
High.................   23 7/8         21 3/8         24 9/16        24 1/2         20 1/4         20 1/4
Low..................   17 15/16       17 1/4         19 7/8         20             17 5/8         18
 
<CAPTION>
                                1996
                       -----------------------
                            QUARTER ENDED
                       -----------------------
                       SEPT. 30       DEC. 31
                       --------       -------
<S>                    <C>            <C>
High.................   21 3/4         23
Low..................   18 5/8         20 5/8
</TABLE>
 
     The last reported sale price of the Common Stock on the New York Stock
Exchange on February 20, 1998, was $19 9/16.
 
     The Company has a Rights Agreement (the "Rights Agreement") designed to
help assure that all of the Company's stockholders receive fair and equal
treatment in the event of any proposed takeover of the Company. Under this
Rights Agreement, each outstanding share of the Company's Common Stock includes
one common stock purchase right ("Right") which becomes exercisable under
certain circumstances, including when beneficial ownership of the Company's
Common Stock by any person, or group, equals or exceeds 15% of the Company's
outstanding Common Stock (such person being an "Acquiring Person"). Certain
persons specified in the Rights Agreement who owned more than 15% or more of the
Common Stock at the adoption of the Rights Agreement as of September 12, 1997
are not considered Acquiring Persons. See Item 12 -- Security Ownership of
Certain Beneficial Owners and Management. When they become exercisable, each
Right entitles the registered holder to purchase from the Company one-half of
one share of Common Stock at a price of $90.00, per full share of Common Stock
subject to adjustment under certain circumstances. Upon the occurrence of
certain events specified in the Rights Agreement, each holder of a Right (other
than an Acquiring Person) will have the right, upon exercise of such Right, to
receive that number of shares of common stock of the Company (or the surviving
corporation) that, at the time of such transaction, would have a market value of
two times the purchase price of the Right. No Rights were exercisable under the
Rights Agreement at December 31, 1997. See Note 14 of Notes to Consolidated
Financial Statements.
 
                                       29
<PAGE>   30
 
ITEM 6. SELECTED FINANCIAL DATA.
 
     The financial data as of and for the years ended December 31, 1993 through
1997 were derived from the audited consolidated financial statements of the
Company and should be read in connection with the consolidated financial
statements and related notes included elsewhere herein.
 
<TABLE>
<CAPTION>
                                                                              YEAR ENDED DECEMBER 31,
                                                        -------------------------------------------------------------------
                                                           1997          1996          1995          1994          1993
                                                        -----------   -----------   -----------   -----------   -----------
                                                                  (DOLLARS IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                                     <C>           <C>           <C>           <C>           <C>
OPERATING DATA:
Revenues..............................................  $   933,228   $ 1,036,449   $   876,029   $   769,595   $   696,663
Costs and other deductions:
  Product costs and operating expenses................      314,330       341,057       299,133       299,586       301,276
  Exploration expenses................................       99,380        51,765        77,185        53,532        93,640
  Depreciation, depletion and amortization............      216,108       212,470       191,503       168,570       242,704
  Selling, general and administrative expenses........       26,696        26,945        26,098        24,525        23,780
  Interest expense....................................        7,412        25,173        28,783        11,399         6,369
  Preferred dividends of a subsidiary.................                                                                1,911
                                                        -----------   -----------   -----------   -----------   -----------
Income before income taxes and cumulative effect of
  change in accounting principle......................      269,302       379,039       253,327       211,983        26,983
Income taxes (benefit)................................      133,436       226,812       150,977       145,245        (3,686)
                                                        -----------   -----------   -----------   -----------   -----------
Income before cumulative effect of change in
  accounting principle................................      135,866       152,227       102,350        66,738        30,669
Cumulative effect of change in accounting principle...                                                               (3,743)
                                                        -----------   -----------   -----------   -----------   -----------
Net income............................................  $   135,866   $   152,227   $   102,350   $    66,738   $    26,926
                                                        ===========   ===========   ===========   ===========   ===========
Basic earnings per share of common stock:
  Income before cumulative effect of change in
    accounting principle..............................  $      1.60   $      1.75   $      1.17   $       .76   $       .35
  Cumulative effect of change in accounting
    principle.........................................                                                                 (.04)
                                                        -----------   -----------   -----------   -----------   -----------
  Net income..........................................  $      1.60   $      1.75   $      1.17   $       .76   $       .31
                                                        ===========   ===========   ===========   ===========   ===========
Weighted average shares outstanding...................   85,094,393    87,155,028    87,686,777    87,642,451    87,218,027
Diluted earnings per share of common stock:
  Income before cumulative effect of change in
    accounting principle..............................  $      1.59   $      1.74   $      1.16   $       .76   $       .34
  Cumulative effect of change in accounting
    principle.........................................                                                                 (.04)
                                                        -----------   -----------   -----------   -----------   -----------
Net Income............................................  $      1.59   $      1.74   $      1.16   $       .76   $       .30
                                                        ===========   ===========   ===========   ===========   ===========
Weighted average shares outstanding including
  potential dilutive common shares....................   85,558,631    87,561,714    88,098,090    87,936,598    88,332,689
Dividends per share of common stock...................  $       .20   $       .20   $       .20   $       .20   $       .20
                                                        ===========   ===========   ===========   ===========   ===========
BALANCE SHEET DATA (AT END OF PERIOD):
Net working capital...................................  $  (104,303)  $   (77,297)  $   (36,269)  $   (44,439)  $   (52,035)
Property, plant and equipment -- net..................    1,746,661     1,632,423     1,551,198     1,286,278     1,088,884
Total assets..........................................    2,021,556     1,942,004     1,836,818     1,544,634     1,338,741
Long-term debt........................................      626,404       558,463       712,132       536,117       447,374
Common stock and other stockholders' equity...........      668,595       586,022       423,790       349,499       281,246
</TABLE>
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS.
 
RESULTS OF OPERATIONS
 
     1997 Compared with 1996. Net income for the year ended December 31, 1997
was $136 million, or $1.60 per share as compared to net income of $152 million
or $1.75 per share for the year ended December 31, 1996. In 1997, the Company
recorded approximately $43 million of U.S. tax benefits and a one-time U.K.
deferred tax charge of $14 million, see Note 9 of Notes to Consolidated
Financial Statements. Excluding these items, net income for 1997 was $107
million or $1.26 per share. The 1997 earnings were negatively impacted by an
anticipated decline in Indonesian LNG volumes, lower U.K. and Pakistan crude oil
prices and higher exploration expenses partially offset by higher ethylene
margins and lower interest expense.
 
                                       30
<PAGE>   31
 
     Sales and operating revenues for 1997 were $909 million, down from $1,008
million in 1996. International revenues totaled $720 million as compared to $813
million in 1996. In the U.K., sales and operating revenues decreased by $40
million due to lower crude oil prices and lower gas volumes. In Indonesia, sales
decreased $53 million due to lower LNG sales volumes and prices. The Company's
participation share in LNG volumes delivered from its Indonesian operations
declined by approximately 18% in 1997 as LNG cargo deliveries under certain
sales contracts were replaced by ones in which the Company had a lower average
participation interest. In Pakistan, sales were essentially level with 1996 as
higher oil volumes offset lower oil prices.
 
     In 1998, the Company's participation share in LNG volumes delivered from
its Indonesian operations is expected to decline by approximately 18% as certain
LNG sales contracts are replaced by ones in which the Company has a lower
average participation interest. Also, the decline includes a reduction in the
sharing percentages under the Company's production sharing contract beginning in
August 1998. The effect of such lower LNG deliveries will not have as
significant an impact on the Company's total annual cash flow. To a lesser
extent further declines are expected in 1999 while a slight increase is
anticipated in 2000 after the eighth train is completed.
 
     Petrochemical revenues totaled $188 million in 1997 as compared to $193
million in the prior year, while operating profit was $32 million as compared to
$24 million in 1996. The increased operating profit was primarily due to higher
ethylene sales prices and lower feedstock costs, resulting in an average
ethylene margin of 9 cents per pound in 1997 as compared to 6 cents per pound in
1996.
 
     Average prices received and volumes sold by the Company's major operations
during 1997 and 1996, respectively, were as follows:
 
<TABLE>
<CAPTION>
                                                                          VOLUMES
                                                        PRICES         (000S PER DAY)
                                                   ----------------    --------------
                                                    1997      1996     1997     1996
                                                   ------    ------    -----    -----
<S>                                                <C>       <C>       <C>      <C>
Crude oil (barrels):
  U.K............................................  $17.28    $19.60       43       43
  Pakistan.......................................   17.09     17.75        7        6
  Indonesia......................................   19.71     19.49        6        6
Indonesian LNG (Mcf).............................    3.45      3.52      179      218
Pakistan natural gas (Mcf).......................    1.61      1.61       37       41
U.K. natural gas (Mcf)...........................    2.92      2.83       28       46
U.S. ethylene (pounds)...........................     .24       .22    1,301    1,392
</TABLE>
 
     Exploration expenses increased by $48 million due to higher exploration
drilling and geological and geophysical ("G&G") expenditures. Product costs and
operating expenses decreased by $27 million, due to lower Indonesian operating
expenses and a charge in 1996 for the voluntary retirement program. Interest
expense decreased by $18 million primarily due to higher capitalized interest
related to the final phases of development of the Britannia field, which is
expected to commence production in August 1998.
 
     1996 Compared with 1995. Net income for the year ended December 31, 1996
was $152 million, or $1.75 per share as compared to net income of $102 million,
or $1.17 per share for the year ended December 31, 1995. The 1996 earnings were
favorably impacted by higher worldwide oil prices, higher sales volumes in the
U.K., higher Indonesian LNG sales prices and volumes and lower exploration
expenses, partially offset by lower ethylene margins and the cost of a special,
one-time voluntary retirement program.
 
     Sales and operating revenues for 1996 were $1,008 million, up from $852
million in 1995. International revenues totaled $813 million as compared to $651
million in 1995. In the U.K., sales and operating revenues increased by $83
million due to higher prices and increased sales volumes, which were primarily a
result of the July 1995 acquisition of an interest in the Alba field. In
Indonesia, sales increased $64 million due to higher LNG sales prices and
volumes and higher crude oil prices. In Pakistan, sales were $15 million above
1995 due to higher crude oil and gas prices, partially offset by lower gas
volumes.
 
                                       31
<PAGE>   32
 
     Petrochemical revenues totaled $193 million in 1996 as compared to $200
million in the prior year, while operating profit was $24 million as compared to
$62 million in 1995. The decreased operating profit was primarily due to lower
ethylene sales prices and increased feedstock costs, resulting in an average
ethylene margin of 6 cents per pound in 1996 vs. 13 cents per pound in 1995.
 
FINANCIAL CONDITION AND LIQUIDITY
 
     General. In order to increase value for all the Company's stockholders, the
Company's long-term growth strategy is an active program focused on development
of core producing assets, participation in a diversified exploration program,
participation in enhanced production ventures and growth of its petrochemical
business. In 1997 the Company successfully bid to enter operations in Venezuela,
formed new exploration ventures in Kazakhstan/Caspian Sea, China and other
strategic areas and continued development of the U.K. and Alaska oil and gas
projects. At year-end 1997, estimated proved worldwide reserves grew to 459
MMboe from 443 MMboe at year-end 1996 and the Company replaced about 134% of its
worldwide production over the three year period 1995 through 1997. The Company's
oil and gas production costs per barrel of oil equivalent averaged $3.66 per
barrel in 1997, compared to $3.61, $3.95, $3.98 and $4.73 in 1996, 1995, 1994
and 1993, respectively. The Company replaced approximately 135% of its 1997
worldwide production.
 
     In 1998 the Company is focused on pursuing both near-term and long-term
growth opportunities through an active program focused on development of
existing core producing assets, development and integration of Venezuela as a
new core producing asset, participation in a diversified exploration program,
participation in enhanced production ventures, portfolio management and growth
of its petrochemical business. An important key to growth for the Company is
adding new reserves to replace reserves that are depleted by production and that
are at normal decline in production rates as well as to offset the significant
lesser participation share of the gas volumes the Company has and will have to
support Indonesian LNG sales contracts. With the addition of the operating
service fee agreements in Venezuela and expectations from other properties, the
Company expects to increase its estimated annual production from 44.2 million
barrels of oil equivalent in 1997 to about 53 million barrels of oil equivalent
in 1998. The Company anticipates that by 2002 its annual worldwide production
will reach 90 million barrels of oil equivalent, which production growth will
benefit substantially from the successful development of the Venezuelan
operations, the Britannia field in the U.K. North Sea and the Alpine field in
Alaska's North Slope.
 
     Achievement of growth through this program will require significant capital
investment as reflected in the capital expenditure budget for 1998, which
represents an increase of approximately 60% over the amount spent in 1997,
excluding acquisitions. The Company's capital expenditures for 1998 are
estimated to be $413 million, excluding capitalized interest, and reflect a
focus on development projects while maintaining a diversified exploration
program. Approximately $284 million of the 1998 capital budget is allocated for
oil and gas development projects. The major components of the 1998 development
budget are the Company's two new operations in Venezuela, increased development
activity in the Alpine project in Alaska's North Slope and completion of the
U.K. North Sea Britannia gas development project. The Company has budgeted
approximately $82 million for exploration projects, including participating in
20-25 exploration wells in strategic areas as well as at its producing ventures
in the U.K. North Sea, Indonesia and Pakistan. In addition to growth in its oil
and gas business, the Company is studying opportunities for expanding and adding
value to its Gulf Coast petrochemical business. The Company's growth strategy
will require implementing investment opportunities in a very competitive
industry environment. The Company will consider strategies to leverage or
increase value in its portfolio of properties, including selective farmouts as
well as opportunities with its mature assets.
 
     The Company's business and strategy are impacted by prices the Company
receives for its crude oil, LNG, natural gas, ethylene and Venezuelan service
fees that are subject to many factors beyond the Company's control. At the end
of 1997 and in the beginning of 1998, worldwide oil prices have declined, with
the spot price for West Texas Intermediate averaging $16.65 per barrel in
January 1998. In the beginning of 1998, the operating service fee for the
Venezuelan DZO unit was approximately $5.00 per barrel and is adjusted quarterly
by the percentage change of a basket of crude oil prices instead of absolute
dollar changes. Although the Company cannot predict with any degree of certainty
the prices it will receive in 1998 and future
                                       32
<PAGE>   33
 
years for its products and services, it estimates that a change of $1.00 in the
average price of crude oil and LNG impacts the Company's net income and cash
flow by approximately $22 million and $25 million, respectively. Also, the
Company estimates that a margin change of an average one cent per pound of
ethylene for an entire year at full capacity production would affect net income
and cash flow on an annualized basis for the petrochemical business of the
Company by approximately $5 million.
 
     In developing its business plan for 1998, the Company has assumed that oil
prices will have a recovery from the January 1998 levels. In 1998 the Company
has budgeted for significant capital investment that will be funded with
increased borrowings under its credit facilities and contemplated issuance of
preferred and long-term debt securities as well as funds from operations.
Approximately 90% of the Company's oil and gas revenues are indexed to world
crude oil prices. With such assumptions for the business plan and increased
interest expense and higher capital spending, the Company anticipates a decline
in net income and cash flow in 1998. In the event that prices are materially
below those assumed in its business plan, the Company has a contingency program
that includes reductions in capital and operating expenses that would not
significantly impact current operations but defer certain exploration and
development plans. Any such deferrals could limit opportunities for new reserves
from exploration successes and delay anticipated production from certain
properties thus impacting net income and cash flows.
 
     Cash flow. Net cash provided by operating activities was $272 million in
1997, a decrease of $112 million from the prior year. The decrease was primarily
the result of lower crude oil prices and a decline in LNG sales volumes. Net
cash required by investing activities was $318 million in 1997, an increase of
$177 million from 1996. The change was primarily related to the increase in
property, plant and equipment for the Boqueron acquisition. In 1997, net cash
provided by financing activities was $27 million compared to net cash required
in 1996 of $211 million. The change resulted from the use of excess cash flow to
pay down debt and 1997 borrowings to fund the Boqueron acquisition.
 
     Capital resources. Capital expenditures for 1997 were $379 million,
excluding capitalized interest, an increase from the prior year's expenditures
of $186 million. This increase was primarily the result of the Company's
Boqueron acquisition and higher exploration drilling and G&G expenditures.
 
     The Company acquired in February 1998 all of the stock of Compania
Occidental de Hidrocarburos, Inc ("Hidrocarburos"), a U.S. affiliate of
Occidental Oil & Gas Corporation ("Occidental"), for approximately $212 million,
which includes approximately $14 million in working capital and certain closing
adjustments effective as of December 31, 1997. The Company initially funded the
acquisition under bank facilities, including a new $130 million facility through
Hidrocarburos guaranteed by the Company. Occidental may receive contingent
payments of up to a maximum of $15 million annually for six years based
primarily on the level of oil prices. Hidrocarburos operates as contractor of
the DZO unit in Western Venezuela under a 20-year operating service contract
with a subsidiary of the national oil company, PDVSA. The contractor invests
capital and provides technology for reactivation of the fields for which the
contractor receives various fees per barrel delivered to the custody transfer
point. The fees received are operating, capital reimbursement and interest on
unrecovered capital costs which are in total limited by a maximum total fee. The
maximum total fee is indexed with a basket of crude oil products and was
approximately $7.50 per barrel in the latter half of 1997. The Company cannot
predict the extent that the future maximum total fee will limit the operating,
interest and capital fees received and recorded. Additionally, an incremental
incentive fee of several dollars per barrel, which is also indexed to a basket
of crude oil products but is not limited by the maximum total fee, is payable
when cumulative production from the DZO unit (from inception of the 1993
contract) reaches 52 million barrels. Cumulative production is expected to reach
52 million barrels during the second half of 1999. The contractor does not pay
royalties related to the DZO unit. Operating costs in early 1998 averaged about
$2.90 per barrel. In 1998, the Company recorded for the DZO unit 114 million
barrels of proved reserves of which 56 million barrels are classified as proved
undeveloped. The Company anticipates spending $400 to $450 million over the next
nine years for future DZO development expenditures. The Company plans to
increase current production from 23,000 gross barrels a day up to 55,000 gross
barrels within five years.
 
     In June 1997, the Company led a successful bid for the Boqueron contract
area under Venezuela's Third Operating Agreement Round. The Company was named
the operator and is a contractor with a 66.67%
 
                                       33
<PAGE>   34
 
interest in the operating service contract and Preussag Energie GmbH of Germany,
the other contractor and a co-venturer, has a 33.33% interest (collectively, the
"Contractors"). The Company and Preussag Energie paid $175 million for the
rights to the service contract for the Boqueron contract area. Under the 20-year
contract, the Contractors will produce oil from Boqueron on behalf of a
subsidiary of PDVSA, which currently serves as operator. The Company expects to
assume operatorship in May 1998, pending approval of its development plan. The
Contractors are compensated a U.S. dollar service fee to cover reimbursement of
costs plus profit. There are two components of the fee, which include (i) a set
fee for baseline production and (ii) a fee for incremental production. The PDVSA
subsidiary will pay the Contractors a set fee of $1.25 per barrel for operating
the baseline production. In the Boqueron contract area, the baseline production
initial rate is estimated at 8,500 gross barrels of oil a day with a nominal
annual decline rate of 10%. In terms of the incremental production, the
Contractors will be paid a sliding incentive fee based on field profitability
and will be allowed to recover field and other capital and operating costs
through the fee mechanism. The field profitability is based on production at
world market prices net of a 1/6 government royalty and field costs. The Company
recorded approximately 40 million net barrels in proved reserves from the
Boqueron contract area during 1997 with additional reserves expected to be
recorded in the future as the field is further developed. The Contractors must
invest at least $13 million over the next three years and currently expect to
spend between $300 million and $325 million in the area over the next five
years. With this additional development spending, the Company expects to
increase current production at the Boqueron contract area from 8,500 gross
barrels of oil a day to a rate of 50,000 to 60,000 gross barrels within three to
five years.
 
     Financing Activities: For information on the Company's outstanding debt
agreements, see Note 7 of the Notes to Consolidated Financial Statements. The
Company had two unsecured credit facilities (the "Credit Facilities") at
December 31, 1997. One of the Credit Facilities is a $100 million revolver that
provides for conversion of amounts outstanding on March 10, 1998 to a one-year
term loan maturing March 9, 1999. The Company is in negotiations to replace the
$100 million Credit Facility. The other Credit Facility is a dual currency (U.S.
dollars and pounds sterling) $450 million revolver that reduces quarterly by $35
million beginning June 30, 2001, with a final maturity of March 31, 2002. At
December 31, 1997, no amounts were outstanding under the Credit Facilities. The
Credit Facilities contain restrictive covenants, including maintenance of
certain coverage ratios related to the incurrence of additional indebtedness and
limitations on asset sales and mergers or consolidations. The covenants also
require maintenance of stockholders' equity, as adjusted, at $350 million. Under
the terms of the Credit Facilities, the Company may pay dividends and make stock
repurchases provided that such level of minimum stockholders' equity is
maintained and the Company complies with certain other covenants in the Credit
Facilities. At December 31, 1997, the Company's adjusted stockholders' equity
was approximately $704 million.
 
     The Company has uncommitted and unsecured lines of credit with several
banks in both U.S. dollars and pounds sterling. At December 31, 1997, $83
million was outstanding under these money market lines which bore interest at a
weighted average rate of 6.9% per annum. In February 1998 the Company's indirect
subsidiary, Hidrocarburos, entered into a $130 million committed term loan,
which matures on May 4, 1998, to initially fund a portion of the DZO
acquisition. The term loan is guaranteed by the Company, and supported by the
$450 million Credit Facility. The Company intends to refinance such term loan
with long-term financing. At February 20, 1998, $85 million, $130 million and
$121 million were outstanding under the Credit Facilities, term loan and the
uncommitted lines of credit, respectively. As of such date, the Company had
approximately $214 million of such available financing.
 
     The Company's indirect subsidiary, Union Texas Britannia Limited ("UTBL"),
has a 150 million pounds sterling secured financing from a syndicate of banks.
The financing has a final maturity in September 2005. At December 31, 1997, 85
million pounds sterling ($141 million) was outstanding under UTBL's financing
which bore interest at a weighted average rate of 8.4% per annum.
 
     The Company has outstanding $100 million principal amount of 8.25% Senior
Notes due 1999, $125 million principal amount of 8 3/8% Senior Notes due 2005
and $75 million principal amount of 8 1/2% Senior Notes due 2007 (collectively
the "Senior Notes"). In 1995 the Company issued $100 million aggregate principal
amount of medium term notes ("MTN") with terms of seven and twelve years and
interest rates varying from 6.51% to 6.81%. The Senior Notes and MTN are
referred to herein as the "Notes". The Notes
                                       34
<PAGE>   35
 
represent general unsecured obligations of the Company and rank pari passu in
right of payment with the Company's obligations under its Credit Facilities, and
senior in right of payment to any future subordinated indebtedness of the
Company. Each of the Notes contain similar restrictive covenants. The Notes are
redeemable at any time, at the option of the Company, in whole or in part, at a
price equal to 100% of their principal amount plus accrued interest plus a
make-whole premium relating to the then-prevailing Treasury Yield and the
remaining life of the Notes.
 
     In July 1997, the Company filed a shelf registration statement with the
SEC, covering the issuance of up to $500 million of several types of securities,
including debt securities, common stock, preferred stock and warrants to
purchase securities in any combination that the Company may elect to offer from
time to time on such terms as the Company deems appropriate. The Company
believes the shelf registration provides additional financing flexibility to
meet future funding requirements and to take advantage of potentially attractive
capital market conditions. The Company intends to use the net proceeds from any
offering for general corporate purposes, which may include the repayment of
outstanding indebtedness, working capital increases, capital expenditures and
acquisitions. No securities have yet been issued, although the Company is
contemplating an offering of preferred stock and long-term debt securities.
 
     In 1994, the Company's Board of Directors authorized the repurchase of up
to 2,000,000 shares of the Company's stock, all of which were repurchased by the
end of 1996. In October, 1996, the Company's Board of Directors authorized the
repurchase of up to an additional 2,000,000 shares of the Company's common
stock, all of which were repurchased by March 31, 1997. The repurchased stock
will be used for general corporate purposes, including fulfilling employee
benefit program obligations. At December 31, 1997, 2,728,267 shares of common
stock were held, at cost, as treasury shares.
 
     As of December 31, 1997, the Company's scheduled maturities of long-term
debt outstanding for the five-year period of 1998 through 2002 are approximately
$0 million, $123 million, $30 million, $33 million and $186 million,
respectively. The Company believes that it will have sufficient sources of funds
to satisfy these scheduled maturities. The Company may enter into interest rate
swap contracts from time to time. However, the Company did not enter into any
interest rate swap contracts during 1997.
 
     Financial Condition. In each of the four quarters ended December 31, 1997,
the Company declared and paid a dividend of approximately $4.4 million on its
common stock. On January 21, 1998, the Company announced a dividend on its
common stock of $.05 per share to stockholders of record as of January 30, 1998,
which was paid on February 13, 1998.
 
     Since the Company's U.S. corporate alternative minimum tax ("AMT")
liability has exceeded its otherwise determined regular U.S. federal income tax
liability, the Company has accumulated an AMT credit of approximately $24
million which may be applied against future regular federal tax liabilities. In
addition, the Company has approximately $117 million (pre-tax) of Net Operating
Loss ("NOL") carryforwards from its U.S. exploration and production operations
which could be applied against future U.S. federal taxable income. These NOLs
must be utilized prior to their expiration, which is between 2002 and 2006, see
Note 9 of Notes to Consolidated Financial Statements.
 
     As a result of reserve engineering analysis and subsequent development
plans for the Company's reserves in the Alpine field in Alaska as well as
expectations for its U.S. petrochemical business, the Company now expects to
utilize the AMT credit and a portion of the NOL carryforwards. In 1997, the
Company adjusted its deferred tax valuation allowance and subsequently recorded
$43 million of net income, representing the $24 million AMT credit and $19
million (after-tax) of NOL carryforwards, see Note 9 of Notes to Consolidated
Financial Statements. Changes in the Company's actual or anticipated income
subject to U.S. taxes, changes in U.S. tax laws or changes in U.S. tax rates may
give rise to adjustments to the Company's deferred tax assets or liabilities,
including the valuation allowance, in the future.
 
     As a result of its international operations, the Company monitors currency
rate fluctuations, including the impact of the recent activity in the Asian
market. Such fluctuations have not had a material impact on the Company's
operations. In 1997 and 1998, 80% and 74%, respectively, of the Indonesia
natural gas supplied by the Company's joint venture was, and is expected to be
sold, to Japanese industrial and utility customers, with
 
                                       35
<PAGE>   36
 
the remainder sold to Korean and Taiwanese buyers. Although the Company cannot
predict the impact of the current Asian economic crisis on the buyers of LNG,
the Company expects currently that it will not have a material impact on the
Company in 1998. Payments for the Indonesian LNG under all of the sales
contracts are made in U.S. dollars directly to a bank in the U.S. that acts as
trustee and paying agent with respect to the sales proceeds. Likewise all
invoice and payments for the operating service fees in Venezuela will be made in
U.S. dollars.
 
     The functional currency for translating the accounts of foreign
subsidiaries is the U.S. dollar, except for subsidiaries in the U.K. where the
functional currency is pounds sterling. The Company's revenues are predominantly
based upon the world market price for crude oil, which is denominated in U.S.
dollars. Certain operating costs, taxes, capital costs and intercompany
transactions represent commitments settled in foreign currencies. Exchange rate
fluctuations on transactions in currencies other than the functional currency
are recognized as gains and losses in current period income. The Company
periodically enters into foreign exchange contracts as a hedge against
fluctuations in foreign currency rates. These contracts are generally of a
short-term nature. At December 31, 1997, the Company had open contracts with a
net value of 7 million pounds sterling. However, there are foreign exchange
risks inherent in operations such as the Company's, and the Company cannot
predict with any certainty the results of currency exchange rate fluctuations.
 
     The Company may enter into hedging contracts and other risk management
activities, such as swaps or fixed price contracts in order to minimize the
impact of adverse price fluctuations. Gains or losses on these activities are
recognized in sales revenues when the underlying exposed hedged production is
sold. As of December 31, 1997, the Company did not have any such contracts.
 
     The year 2000 issue relates to computer programs being written with two
digits rather than four to define the applicable year. Computer programs that
have date-sensitive software may recognize a date using "00" as the year 1900
instead of 2000. The Company is addressing the year 2000 issue through an
assessment of its operational field systems, information technology systems and
the year 2000 readiness of its significant partners, suppliers, vendors and
customers. This assessment includes among other matters a detailed analysis of
the Company's worldwide software and hardware applications and communications
with the companies who operate a significant portion of the Company's assets.
The Company is in the process of converting its software accounting system to a
new system, which is year 2000 compliant. The Company has targeted mid-1999 as
the completion date for its plan. While the Company expects to resolve its year
2000 issue substantially through the replacement and upgrades of software, there
can be no guarantee that the systems of other companies on which the Company
depends will be timely converted or that a failure to convert by another
company, or a conversion that is not compatible with the Company's systems,
would not have a material adverse effect on the Company. The Company does not
expect that the costs of addressing the year 2000 issue will have a material
impact on the Company's financial position or results of operations.
 
     The foregoing discussion of the Company's financial condition and liquidity
includes in several instances forward-looking statements, which are based upon
management's good faith assumptions relating to the financial, market, operating
and other relevant environments that will exist and affect the Company's
business and operations in the future. No assurance can be made that the
assumptions upon which management based its forward-looking statements will
prove to be correct, or that the Company's business and operations will not be
affected in any substantial manner by other factors not currently foreseeable by
management or beyond the Company's control. All forward-looking statements
involve risks and uncertainty, including, but not limited to, the following:
volatility of crude oil, LNG, natural gas and ethylene prices, capital
expenditures, production variances from expectations, the need to develop and
replace reserves, risks in the development and integration of new assets,
environmental risks, drilling and operating risks, risks related to exploration
and development projects, uncertainties about estimates of reserves,
competition, government actions and regulations, foreign currencies and the
ability of the Company to implement its business strategy. For additional
discussion of such risks, uncertainties and assumptions, see Item
1. Business -- Risk Factors.
 
                                       36
<PAGE>   37
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Accountants...........................   38
Consolidated Balance Sheet, December 31, 1997 and 1996......   39
Consolidated Statement of Operations, Years Ended December
  31, 1997, 1996 and 1995...................................   40
Consolidated Statement of Cash Flows, Years Ended December
  31, 1997, 1996 and 1995...................................   41
Consolidated Statement of Stockholders' Equity, Years Ended
  December 31, 1997, 1996 and
  1995......................................................   42
Notes to Consolidated Financial Statements..................   43
</TABLE>
 
                                       37
<PAGE>   38
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Stockholders and Directors of
Union Texas Petroleum Holdings, Inc.
 
In our opinion, the consolidated financial statements listed in the accompanying
index present fairly, in all material respects, the financial position of Union
Texas Petroleum Holdings, Inc. and its subsidiaries at December 31, 1997 and
1996, and the results of their operations and their cash flows for each of the
three years in the period ended December 31, 1997, in conformity with generally
accepted accounting principles. These financial statements are the
responsibility of the Company's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.
 
PRICE WATERHOUSE LLP
 
Houston, Texas
February 16, 1998
 
                                       38
<PAGE>   39
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                           CONSOLIDATED BALANCE SHEET
                             (DOLLARS IN THOUSANDS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------
                                                                 1997         1996
                                                              ----------   ----------
<S>                                                           <C>          <C>
Current assets:
  Cash and cash equivalents.................................  $   24,324   $   43,574
  Accounts and notes receivable.............................      82,172       96,687
  Inventories...............................................      38,318       39,721
  Prepaid expenses and other current assets.................      30,539       23,560
                                                              ----------   ----------
          Total current assets..............................     175,353      203,542
Equity investments..........................................      90,488       93,262
Property, plant and equipment, at cost, less accumulated
  depreciation, depletion and amortization*.................   1,746,661    1,632,423
Other assets................................................       9,054       12,777
                                                              ----------   ----------
          Total assets......................................  $2,021,556   $1,942,004
                                                              ==========   ==========
                        LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Current portion of long-term debt.........................  $            $    2,290
  Accounts payable..........................................     132,735      103,225
  Taxes payable.............................................      94,366      126,813
  Other current liabilities.................................      52,555       48,511
                                                              ----------   ----------
          Total current liabilities.........................     279,656      280,839
Long-term debt..............................................     626,404      558,463
Deferred income taxes.......................................     321,879      391,534
Other liabilities...........................................     125,022      125,146
                                                              ----------   ----------
          Total liabilities.................................   1,352,961    1,355,982
                                                              ----------   ----------
Stockholders' equity:
  Common stock..............................................       4,391        4,391
  Paid in capital...........................................      18,645       18,863
  Cumulative foreign exchange translation adjustment and
     other..................................................     (34,954)     (21,955)
  Retained earnings.........................................     733,201      614,376
  Common stock held in treasury, at cost, 2,728,267 shares
     at December 31, 1997 and 1,490,322 shares at December
     31, 1996...............................................     (52,688)     (29,653)
                                                              ----------   ----------
          Total stockholders' equity........................     668,595      586,022
                                                              ----------   ----------
          Total liabilities and stockholders' equity........  $2,021,556   $1,942,004
                                                              ==========   ==========
</TABLE>
 
- ---------------
 
* The Company follows the successful efforts method of accounting for oil and
  gas activities.
 
    The accompanying notes are an integral part of this financial statement.
 
                                       39
<PAGE>   40
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                      CONSOLIDATED STATEMENT OF OPERATIONS
                (DOLLARS IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                              --------------------------------
                                                                1997        1996        1995
                                                              --------   ----------   --------
<S>                                                           <C>        <C>          <C>
REVENUES:
  Sales and operating revenues..............................  $909,391   $1,008,476   $851,601
  Interest income and other revenues........................     3,224        1,836      3,557
  Net income of equity investees............................    20,613       26,137     20,871
                                                              --------   ----------   --------
                                                               933,228    1,036,449    876,029
COSTS AND OTHER DEDUCTIONS:
  Product costs and operating expenses......................   314,330      341,057    299,133
  Exploration expenses......................................    99,380       51,765     77,185
  Depreciation, depletion and amortization..................   216,108      212,470    191,503
  Selling, general and administrative expenses..............    26,696       26,945     26,098
  Interest expense..........................................     7,412       25,173     28,783
                                                              --------   ----------   --------
Income before income taxes..................................   269,302      379,039    253,327
Provision for income taxes..................................   133,436      226,812    150,977
                                                              --------   ----------   --------
Net income..................................................  $135,866   $  152,227   $102,350
                                                              ========   ==========   ========
EARNINGS PER SHARE OF COMMON STOCK:
  Basic earnings per share of common stock..................  $   1.60   $     1.75   $   1.17
                                                              ========   ==========   ========
  Diluted earnings per share of common stock................  $   1.59   $     1.74   $   1.16
                                                              ========   ==========   ========
DIVIDENDS PER SHARE OF COMMON STOCK.........................  $    .20   $      .20   $    .20
                                                              ========   ==========   ========
Weighted average number of shares outstanding (000s)........    85,094       87,155     87,687
                                                              ========   ==========   ========
Weighted average number of shares outstanding including
  potential dilutive common shares (000s)...................    85,559       87,561     88,098
                                                              ========   ==========   ========
</TABLE>
 
    The accompanying notes are an integral part of this financial statement.
 
                                       40
<PAGE>   41
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                YEAR ENDED DECEMBER 31,
                                          -----------------------------------
                                            1997         1996         1995
                                          ---------    ---------    ---------
<S>                                       <C>          <C>          <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income............................  $ 135,866    $ 152,227    $ 102,350
  Adjustments to reconcile net income to
     net cash provided by operating
     activities:
     Depreciation, depletion and
       amortization.....................    216,108      212,470      191,503
     Deferred income taxes..............    (63,540)     (31,588)     (19,576)
     Net income of equity investees.....    (20,613)     (26,137)     (20,871)
     Other..............................      3,377        2,981        3,581
                                          ---------    ---------    ---------
       Net cash provided by operating
          activities before changes in
          other assets and
          liabilities...................    271,198      309,953      256,987
       Decrease (increase) in accounts
          and notes receivable..........     13,642      (17,793)     (22,667)
       Decrease in inventories..........      1,049        4,228        1,351
       (Increase) decrease in prepaid
          expenses and other assets.....     (4,948)      10,569       (6,628)
       Increase in accounts payable and
          other liabilities.............     19,936        8,410        3,233
       (Decrease) increase in income
          taxes payable.................    (29,006)      68,630        1,649
                                          ---------    ---------    ---------
       Net cash provided by operating
          activities....................    271,871      383,997      233,925
                                          ---------    ---------    ---------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Additions to property, plant and
     equipment..........................   (341,297)    (181,967)    (412,039)
  Cash provided by equity investees.....     23,387       41,351       26,900
  Cash required by sale of businesses,
     net................................                                 (809)
                                          ---------    ---------    ---------
  Net cash required by investing
     activities.........................   (317,910)    (140,616)    (385,948)
                                          ---------    ---------    ---------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net proceeds from long-term debt......     44,203       61,440      327,103
  Payments to settle long-term debt.....     (2,290)      (2,292)      (2,292)
  Net payments under credit
     facilities.........................                (132,000)    (193,503)
  Net proceeds (payments) from money
     market lines of credit ............     27,893      (92,069)      43,151
  Purchase of treasury stock............    (34,305)     (32,360)      (4,136)
  Proceeds from issuance of treasury
     stock..............................      8,329        3,876        1,916
  Dividends paid........................    (17,041)     (17,471)     (17,536)
                                          ---------    ---------    ---------
  Net cash provided (required) by
     financing activities...............     26,789     (210,876)     154,703
                                          ---------    ---------    ---------
  Net (decrease) increase in cash and
     cash equivalents...................    (19,250)      32,505        2,680
Cash and cash equivalents at beginning
  of year...............................     43,574       11,069        8,389
                                          ---------    ---------    ---------
Cash and cash equivalents at end of
  year..................................  $  24,324    $  43,574    $  11,069
                                          =========    =========    =========
SUPPLEMENTAL DISCLOSURE OF CASH FLOW
  INFORMATION:
  Cash paid during the period for:
     Interest (net of amount
       capitalized).....................  $   5,457    $  22,882    $  29,765
     Income taxes.......................    223,183      190,517      168,140
</TABLE>
 
    The accompanying notes are an integral part of this financial statement.
 
                                       41
<PAGE>   42
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                 CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                     -----------------------------------------
                                                        1997           1996           1995
                                                     -----------    -----------    -----------
<S>                                                  <C>            <C>            <C>
COMMON STOCK (SHARES)
  Authorized.......................................  200,000,000    200,000,000    200,000,000
                                                     ===========    ===========    ===========
  Issued:
     Beginning of year.............................   87,829,283     87,829,283     87,829,283
     Issuance of stock.............................
                                                     -----------    -----------    -----------
     Ending balance................................   87,829,283     87,829,283     87,829,283
                                                     ===========    ===========    ===========
COMMON STOCK AT PAR VALUE ($.05 PER SHARE)
  Beginning of year................................  $     4,391    $     4,391    $     4,391
  Issuance of stock................................
                                                     -----------    -----------    -----------
  Ending balance...................................  $     4,391    $     4,391    $     4,391
                                                     ===========    ===========    ===========
PAID IN CAPITAL
  Beginning balance................................  $    18,863    $    19,405    $    19,889
  Issuance of stock................................
  Reissuance of treasury stock.....................         (218)          (542)          (484)
                                                     -----------    -----------    -----------
  Ending balance...................................  $    18,645    $    18,863    $    19,405
                                                     ===========    ===========    ===========
CUMULATIVE FOREIGN EXCHANGE TRANSLATION ADJUSTMENT
  AND OTHER
  Beginning balance................................  $   (21,955)   $   (75,077)   $   (65,476)
  Translation adjustments..........................      (13,038)        53,044         (9,406)
  Supplemental pension plan minimum liability......           39             78           (195)
                                                     -----------    -----------    -----------
  Ending balance...................................  $   (34,954)   $   (21,955)   $   (75,077)
                                                     ===========    ===========    ===========
RETAINED EARNINGS
  Beginning balance................................  $   614,376    $   479,620    $   394,806
  Net income.......................................      135,866        152,227        102,350
  Dividends on common stock........................      (17,041)       (17,471)       (17,536)
                                                     -----------    -----------    -----------
  Ending balance...................................  $   733,201    $   614,376    $   479,620
                                                     ===========    ===========    ===========
TREASURY STOCK, AT COST
  Beginning balance................................  $   (29,653)   $    (4,549)   $    (4,111)
  Purchases........................................      (34,305)       (32,360)        (4,136)
  Issues...........................................       11,270          7,256          3,698
                                                     -----------    -----------    -----------
  Ending balance...................................  $   (52,688)   $   (29,653)   $    (4,549)
                                                     ===========    ===========    ===========
</TABLE>
 
    The accompanying notes are an integral part of this financial statement.
 
                                       42
<PAGE>   43
 
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
NOTE 1 -- ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Organization
 
     The Company is engaged in oil and gas exploration and production
principally overseas and petrochemical manufacturing in the United States.
International activities are conducted primarily in Indonesia, the United
Kingdom sector of the North Sea, Venezuela, Pakistan and other strategic areas.
Two limited partnerships (the "KKR Partnerships"), organized and controlled by
an affiliate of Kohlberg Kravis Roberts & Co. ("KKR"), own approximately 25.7%
of the Company's issued and outstanding common stock.
 
  Principles of consolidation
 
     The consolidated financial statements include the accounts of Union Texas
Petroleum Holdings, Inc. ("UTPH"), its wholly owned subsidiaries and
proportionate interests in the assets, liabilities and operations of
unincorporated joint ventures (referred to herein individually and collectively
as the "Company"). Investments in which the Company has between a 20% to 50%
ownership interest are accounted for using the equity method. All material
intercompany transactions are eliminated.
 
  Use of estimates
 
     The consolidated financial statements are prepared in conformity with
general accepted accounting principles, which require management to make certain
estimates and assumptions that affect the reported amounts of certain assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the related reported amounts of revenues and
expenses during the reporting period. Actual results could differ from those
estimates. Management believes that the estimates are reasonable.
 
  Inventories
 
     Finished product inventories are valued at the lower of cost or market
using the first-in, first-out method ("FIFO"). Materials and supplies
inventories are valued at the lower of average cost or market. Effective January
1, 1996, the Company changed the method of accounting for valuing its
petrochemical product inventory from the last-in, first out ("LIFO") method to
the first-in, first out ("FIFO") method. The change did not have a material
effect on the results of operations for prior periods, nor is it anticipated
that it will have a material impact on future periods. The Company believes that
use of the FIFO method results in a better measurement of operating results and
better reflects the current value of inventory on the balance sheet.
 
  Property, plant and equipment
 
     Oil and gas exploration and production activities are accounted for
employing the successful efforts method. Under this method, costs of successful
exploratory wells, development wells and acreage are capitalized. Costs of
unsuccessful exploratory wells are expensed upon the determination that the well
does not justify commercial development. Other exploration costs including
geological and geophysical costs in exploration areas, delay rentals, production
costs and overhead are charged to expense as incurred.
 
     Major renewals and improvements are capitalized, and the assets replaced
are retired. Maintenance and repairs are expensed as incurred.
 
     Depreciation, depletion and amortization of the capitalized costs of
producing properties, both tangible and intangible, are provided for on the
units-of-production basis. Unit-of-production rates are based on estimated
proved oil and gas reserves. Annually, or whenever significant events or changes
in circumstances occur, oil and gas producing properties are reviewed to
determine whether it is probable that impairment of the capitalized cost of
specific producing asset groups has occurred. Amortization of undeveloped
acreage
 
                                       43
<PAGE>   44
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
from date of acquisition is based upon such factors as lease term, estimated
evaluation period and prior experience. The Company reviews its leases and
related amortization rates periodically.
 
     Estimated dismantlement, restoration and abandonment costs net of estimated
salvage value are taken into account in determining amortization and are
included in other long-term liabilities, which as of December 31, 1997 and 1996
were $68.6 million and $60.3 million, respectively, of such costs. Depreciable
assets other than oil and gas properties are depreciated using the straight-line
method based on estimated asset service lives from 5 to 31 years.
 
  Foreign currency
 
     The functional currency for translating the accounts of foreign
subsidiaries is the U.S. dollar, except for subsidiaries in the United Kingdom,
where the functional currency is the local currency. Translation adjustments of
this local currency, which represent unrealized increases and decreases in the
Company's net investment in foreign operations as the result of exchange rate
changes, are included in stockholders' equity as the cumulative foreign exchange
translation adjustment. Transaction gains and losses resulting from the effect
of exchange rate fluctuations on transactions in currencies other than the
functional currency are included in determining net income. Foreign exchange
losses included in the determination of net income for the years 1997, 1996, and
1995 were $416, $54 and $768, respectively.
 
  Hedging Activities
 
     The Company periodically enters into foreign exchange contracts as a hedge
against fluctuations in foreign currency rates. These contracts are generally of
a short-term nature. At December 31, 1997, the Company had open foreign exchange
contracts with a net value of 7 million pounds sterling. However, there are
foreign exchange risks inherent in operations such as the Company's, and the
Company cannot predict with any certainty the results of currency exchange rate
fluctuations. The Company may enter into hedging contracts and other risk
management activities, such as swaps or fixed price contracts, in order to
minimize the impact of adverse price fluctuation. Gains or losses on these
activities are recognized in sales revenues when the underlying exposed hedged
production is sold. As of December 31, 1997, the Company did not have any such
open contracts.
 
  Accounting Pronouncements Recently Issued
 
     In 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards ("SFAS") No. 130, Reporting Comprehensive Income"
and SFAS No. 131, "Disclosures about Segments of an Enterprise and Related
Information". SFAS No. 130 is effective for fiscal years beginning after
December 15, 1997. SFAS No. 130 requires that all items required to be
recognized under accounting standards as components of comprehensive income be
reported as a part of the basic financial statements. SFAS No. 131 establishes
standards for reporting information about operating segments in annual financial
statements and requires selected information about operating segments in interim
financial reports issued to shareholders. SFAS No. 131 is effective for
financial statements for periods beginning after December 15, 1997 but the
statement need not be applied to interim financial statements in the initial
year of application. The Company does not expect adoption of these new standards
to materially affect the Company's reporting practices.
 
  Other
 
     The fair value of financial instruments included in the Company's assets
and liabilities approximates carrying value. Cash equivalents are comprised of
highly liquid debt instruments purchased at a maturity of three months or less.
                                       44
<PAGE>   45
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
NOTE 2 -- ACCOUNTS AND NOTES RECEIVABLE
 
     At December 31, 1997 and 1996, accounts and notes receivable consisted of
the following:
 
<TABLE>
<CAPTION>
                                                               1997       1996
                                                              -------    -------
<S>                                                           <C>        <C>
Accounts receivable, trade..................................  $82,172    $96,687
</TABLE>
 
     Most of the Company's worldwide business activity is with major marketing
companies, industrial users and joint venture partners. Those receivables
considered a significant credit risk are backed by letters of credit. Typically,
credit terms are of a short-term nature.
 
NOTE 3 -- INVENTORIES
 
     At December 31, 1997 and 1996, inventories consisted of the following:
 
<TABLE>
<CAPTION>
                                                                 1997       1996
                                                                -------    -------
<S>                                                             <C>        <C>
Products....................................................    $13,884    $15,804
Materials and supplies......................................     24,434     23,917
                                                                -------    -------
                                                                $38,318    $39,721
                                                                =======    =======
</TABLE>
 
NOTE 4 -- PREPAID EXPENSES AND OTHER CURRENT ASSETS
 
     At December 31, 1997 and 1996, prepaid expenses and other current assets
consisted of the following:
 
<TABLE>
<CAPTION>
                                                                 1997       1996
                                                                -------    -------
<S>                                                             <C>        <C>
Prepaid Insurance...........................................    $15,027    $ 7,257
Prepaid Taxes...............................................        565        558
Deferred Charges............................................     14,947     15,745
                                                                -------    -------
                                                                $30,539    $23,560
                                                                =======    =======
</TABLE>
 
NOTE 5 -- EQUITY INVESTMENTS
 
     At December 31, 1997 and 1996, investments, accounted for using the equity
method, consisted of the following:
 
<TABLE>
<CAPTION>
                                                                 1997       1996
                                                                -------    -------
<S>                                                             <C>        <C>
Unimar Company..............................................    $90,204    $93,262
Virginia Enterprises Inc. (VEI).............................        284
                                                                -------    -------
                                                                $90,488    $93,262
                                                                =======    =======
</TABLE>
 
     The Company has a 50% interest in Unimar Company ("Unimar"), a partnership
through which the Company has an additional 11.56% working interest in the
Indonesian joint venture, resulting in a total working interest for the Company
of 37.81%. The Company owns 50% of the stock of VEI, a corporation that focuses
on Indonesian business development opportunities.
 
                                       45
<PAGE>   46
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     The Company's share of selected financial data for its equity investees are
summarized as follows:
 
<TABLE>
<CAPTION>
                                                       1997        1996        1995
                                                     --------    --------    --------
<S>                                                  <C>         <C>         <C>
Net revenues.......................................  $108,671    $126,326    $101,010
Gross profit.......................................    74,665      90,547      67,777
Equity net income..................................  $ 20,430(a) $ 25,707    $ 20,071
Other..............................................       183         430         800
                                                     --------    --------    --------
Net income of equity investees.....................  $ 20,613    $ 26,137    $ 20,871
                                                     ========    ========    ========
</TABLE>
 
- ---------------
 
(a) Includes a net loss of $3,129 for VEI.
 
<TABLE>
<CAPTION>
                                                                1997       1996
                                                              --------   --------
<S>                                                           <C>        <C>
Current assets..............................................  $ 13,782   $ 14,172
Total assets................................................   183,760    191,738
Current liabilities.........................................    17,864     20,047
Partners' account...........................................    83,775     87,219
</TABLE>
 
NOTE 6 -- PROPERTY, PLANT AND EQUIPMENT
 
     At December 31, 1997 and 1996, property, plant and equipment consisted of
the following:
 
<TABLE>
<CAPTION>
                                                               1997           1996
                                                            -----------    -----------
<S>                                                         <C>            <C>
Land and land improvements................................  $    13,800    $    13,055
Oil and gas properties and equipment......................    2,900,045      2,812,546
Plants and equipment......................................      168,330        164,167
Other facilities..........................................       15,272         12,082
Construction and wells in progress........................      399,493        205,261
                                                            -----------    -----------
                                                              3,496,940      3,207,111
Less -- accumulated depreciation, depletion and
  amortization............................................   (1,750,279)    (1,574,688)
                                                            -----------    -----------
                                                            $ 1,746,661    $ 1,632,423
                                                            ===========    ===========
</TABLE>
 
     In June 1997, the Company led a successful bid for Venezuela's Boqueron
area under Venezuela's Third Operating Agreement Round. In the third quarter of
1997 the Company paid $117 million to the Venezuelan government for its share of
the bid. This payment was funded under the Company's Credit Facilities, lines of
credit and cash from operations. The Company was named the operator and has a
66.67% interest in the Boqueron operating service contract with a subsidiary of
PDVSA and will work with the Company's co-venturer, Preussag Energie GmbH of
Germany, who has a 33.33% interest, to further develop this currently-producing
field. An affiliate of PDVSA has the option to purchase up to a 10% interest in
the contract. In 1997 the Company increased property, plant and equipment for
the Boqueron operating service contract by $124 million.
 
     In February 1998, the Company acquired all of the stock of Hidrocarburos, a
U.S. affiliate of Occidental, for approximately $212 million, which included
approximately $14 million in working capital and certain closing adjustments.
The Company initially funded the acquisition under bank facilities, including a
new $130 million facility through Hidrocarburos guaranteed by the Company.
Occidental may receive contingent payments of up to a maximum of $15 million
annually for six years based primarily on the level of oil prices. Hidrocarburos
operates the DZO unit located west of Lake Maracaibo in Western Venezuela under
a 20-year operating service contract with a subsidiary of PDVSA. An affiliate of
PDVSA has the option to purchase up to a 10% interest in the contract.
 
                                       46
<PAGE>   47
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
NOTE 7 -- DEBT
 
     At December 31, 1997 and 1996, long-term debt consisted of the following:
 
<TABLE>
<CAPTION>
                                                                1997        1996
                                                              --------    --------
<S>                                                           <C>         <C>
8.25% Senior Notes due November 15, 1999....................  $100,000    $100,000
8 3/8% Senior Notes due 2005................................   125,000     125,000
8 1/2% Senior Notes due 2007................................    75,000      75,000
Medium Term Notes...........................................   100,000     100,000
Britannia financing.........................................   140,809      98,588
Subsidiary production loan..................................                 2,290
Money market lines of credit and other......................    85,595      59,875
                                                              --------    --------
                                                               626,404     560,753
Less -- portion due within one year.........................                (2,290)
                                                              ========    ========
                                                              $626,404    $558,463
                                                              ========    ========
</TABLE>
 
  Credit Facilities
 
     The Company had two unsecured credit facilities (the "Credit Facilities")
at December 31, 1997. One of the Credit Facilities is a $100 million revolver
that provides for conversion of amounts outstanding on March 10, 1998 to a
one-year term loan maturing March 9, 1999. The Company is in negotiations to
replace the $100 million Credit Facility. The other Credit Facility is a dual
currency (U.S. dollars and pounds sterling) $450 million revolver that reduces
quarterly by $35 million beginning June 30, 2001, with a final maturity of March
31, 2002. At December 31, 1997, no amounts were outstanding under the Credit
Facilities. The $450 million facility allows the Company to borrow up to $300
million in U.S. dollar loans at interest rates determined in a competitive bid
process. Loans under the $450 million facility may be made in both pounds
sterling and U.S. dollars at the option of the Company. Loans under the Credit
Facilities bear interest at floating market rates based on, at the Company's
option, the agent bank's base rate or LIBOR, plus applicable margins subject to
increase or decrease in certain events. The Credit Facilities contain
restrictive covenants, including maintenance of certain coverage ratios related
to the incurrence of additional indebtedness and limitations on asset sales and
mergers or consolidations. The covenants also require maintenance of
stockholders' equity, as adjusted, at $350 million. Under the terms of the
Credit Facilities, the Company may pay dividends and make stock repurchases
provided that such level of minimum stockholders' equity is maintained and the
Company complies with certain other covenants in the Credit Facilities. At
December 31, 1997, the Company's adjusted stockholders' equity was approximately
$704 million. The Credit Facilities provide the Company with the ability to
borrow on a long-term basis.
 
  Term Loan
 
     In February 1998 the Company's indirect subsidiary, Hidrocarburos, entered
into a $130 million committed term loan to initially fund a portion of the DZO
acquisition. The term loan is guaranteed by the Company and is supported by the
$450 million Credit Facility. The facility matures on May 4, 1998 and bears
interest at variable market rates.
 
  Senior and Medium Notes
 
     The Company has outstanding $100 million principal amount of 8.25% Senior
Notes due 1999, $125 million principal amount of 8 3/8% Senior Notes due 2005
and $75 million principal amount of 8 1/2% Senior Notes due 2007 (collectively
the "Senior Notes"). In 1995 the Company issued $100 million aggregate principal
amount of medium term notes ("MTN") with terms of seven and twelve years and
interest rates
                                       47
<PAGE>   48
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
varying from 6.51% to 6.81%. The Senior Notes and MTN are referred to herein as
the "Notes". The Notes represent general unsecured obligations of the Company
and rank pari passu in right of payment with the Company's obligations under its
Credit Facilities, and senior in right of payment to any future subordinated
indebtedness of the Company. Each of the Notes contain similar restrictive
covenants. The Notes are redeemable at any time, at the option of the Company,
in whole or in part, at a price equal to 100% of their principal amount plus
accrued interest plus a make-whole premium relating to the then-prevailing
Treasury Yield and the remaining life of the Notes.
 
  Britannia Financing
 
     The Company's indirect subsidiary, Union Texas Britannia Limited ("UTBL"),
which is a wholly owned subsidiary of UTPL, has a 150 million pounds sterling
secured financing from a syndicate of banks. The financing is used to fund the
Company's share of the cost of developing the Britannia field to production
(including interest and other financing costs incurred prior to completion and
potential cost overruns), and any remaining availability after completion may,
subject to certain coverage ratios being met, be used for UTBL's general
corporate purposes. Except for certain support by UTPL related to any potential
cost overruns in excess of the facility amount (limited to 30 million pounds
sterling), insurance, tax benefits and administrative services, the lenders'
recourse will be limited to the Britannia field project assets and is
nonrecourse to the Company. The financing has a final maturity in September
2005. At December 31, 1997, 85 million pounds sterling ($141 million) was
outstanding under UTBL's financing which bore interest at a weighted average
rate of 8.4% per annum.
 
  Subsidiary Production Loan
 
     In 1997, Union Texas Pakistan, Inc., a wholly owned subsidiary of the
Company, repaid the remaining $2,290 balance of its non recourse loan.
 
  Money Market Lines of Credit
 
     The Company has uncommitted and unsecured lines of credit with several
banks in both U.S. dollars and pounds sterling. These money market borrowings,
which have a short-term maturity, have been classified as long term debt based
on the Company's intent and ability to refinance them on a long-term basis
through its Credit Facilities. At December 31, 1997, $83 million was outstanding
under these money market lines which bore interest at a weighted average rate of
6.9% per annum.
 
     Interest capitalized for the years 1997, 1996, and 1995 was $40,664,
$26,017, and $23,081, respectively.
 
     Scheduled maturities of long-term debt outstanding during the five years
1998 through 2002 are $0, $122,613, $30,184, $33,329 and $185,926, respectively.
 
NOTE 8 -- EARNINGS PER SHARE
 
     In the fourth quarter of 1997, the Company adopted the provisions of SFAS
No. 128, "Earnings Per Share", and restated previously reported earnings per
share in conformity with SFAS 128. The new standard specifies the computation,
presentation and disclosure requirements for earnings per share.
 
                                       48
<PAGE>   49
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     A reconciliation of the numerators and denominators of the basic and
diluted EPS computations is as follows:
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED DECEMBER 31,
                                                     --------------------------------
                                                       1997        1996        1995
                                                     --------    --------    --------
<S>                                                  <C>         <C>         <C>
BASIC EPS COMPUTATION
  Numerator, Net Income............................  $135,866    $152,227    $102,350
  Denominator, Common Shares Outstanding (000's)...    85,094      87,155      87,687
                                                     --------    --------    --------
  Basic EPS per share..............................  $   1.60    $   1.75    $   1.17
                                                     ========    ========    ========
DILUTED EPS COMPUTATION
  Numerator, Net Income............................  $135,866    $152,227    $102,350
  Denominator, Common Shares Outstanding (000's)...    85,094      87,155      87,687
  Potential Common Shares:
     Stock Options (000's).........................       465         406         411
                                                     --------    --------    --------
     Total (000's).................................    85,559      87,561      88,098
                                                     --------    --------    --------
  Diluted EPS Per Share............................  $   1.59    $   1.74    $   1.16
                                                     ========    ========    ========
</TABLE>
 
     Weighted average stock options (000's) in 1997, 1996 and 1995 that were not
included in the computation of diluted shares since they had an anti-dilutive
effect were 446 options, 456 options and 436 options, respectively.
 
NOTE 9 -- INCOME TAXES
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED DECEMBER 31,
                                                     --------------------------------
                                                       1997        1996        1995
                                                     --------    --------    --------
<S>                                                  <C>         <C>         <C>
United States:
  Federal(current).................................  $  4,666    $  2,393    $  2,935
  State (current)..................................     1,435      (2,014)      4,767
  Federal (deferred)...............................   (47,550)
                                                     --------    --------    --------
                                                      (41,449)        379       7,702
                                                     --------    --------    --------
Foreign:
  Current..........................................   190,875     258,021     162,851
  Deferred.........................................   (15,990)    (31,588)    (19,576)
                                                     --------    --------    --------
                                                      174,885     226,433     143,275
                                                     --------    --------    --------
                                                     $133,436    $226,812    $150,977
                                                     ========    ========    ========
</TABLE>
 
     A deferred tax liability or asset is recorded for future tax consequences
arising from differences between the financial accounting and tax basis of the
assets and liabilities of the Company. A valuation allowance with reserves
recorded as necessary for any tax benefit not expected to be realized, is
required of deferred tax assets. Deferred tax liabilities or assets are adjusted
for changes in income tax laws or rates when enacted. Deferred tax expense or
benefit is derived from changes in deferred tax liabilities or assets. A current
tax expense or benefit is recognized for the estimated taxes payable or
refundable on tax returns for the current year.
 
     Under the U.S. corporate alternative minimum tax ("AMT"), the Company's
U.S. tax liability is the greater of its regular U.S. federal income tax or the
AMT. To the extent that the Company's AMT liability exceeds its otherwise
determined regular U.S. federal income tax liability, an AMT credit will be
generated and this credit may be applied against future regular federal tax
liabilities. Since the Company's AMT liability has exceeded its otherwise
determined regular U.S. federal income tax liability, the Company has
accumulated an AMT credit of approximately $24 million which may be applied
against future regular federal tax
 
                                       49
<PAGE>   50
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
liabilities. In addition, the Company has approximately $117 million (pre-tax)
of Net Operating Loss ("NOL") carryforwards from its U.S. exploration and
production operations which could be applied against future U.S. federal taxable
income. These NOLs must be utilized prior to their expiration, which is between
2002 and 2006.
 
     As a result of reserve engineering analysis and subsequent development
plans for the Company's reserves in the Alpine field in Alaska as well as
expectations for its U.S. petrochemical business, the Company now expects to
utilize the AMT credit and a portion of the NOL carryforwards. In 1997 the
Company adjusted its deferred tax valuation allowance and subsequently recorded
$43 million of net income, representing the $24 million AMT credit and $19
million (after-tax) of NOL carryforwards. Changes in the Company's actual or
anticipated income subject to U.S. taxes, changes in U.S. tax laws or changes in
U.S. tax rates may give rise to adjustments to the Company's deferred tax assets
or liabilities, including the valuation allowance, in the future.
 
     In the third quarter of 1997, the British government enacted changes in the
U.K. corporate tax laws which affect the Company's U.K. operations. The ACT
credit on dividends paid by U.K. companies has been substantially reduced and
the U.K. corporate tax rate was lowered from 33% to 31%. The reduction in the
ACT credit will be effective for dividends paid on or after April 6, 1999 while
the lowering of the corporate tax rate was effective April 1, 1997. In the third
quarter of 1997, the Company recorded a one-time, non-cash charge to deferred
tax expense of approximately $14 million, primarily related to the reduction of
the ACT credit on future dividends.
 
     The principal items accounting for the difference in taxes on income
computed at the United States statutory rate and as recorded are as follows:
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED DECEMBER 31,
                                                     --------------------------------
                                                       1997        1996        1995
                                                     --------    --------    --------
<S>                                                  <C>         <C>         <C>
Computed tax at 35% of pretax income...............  $ 94,256    $132,664    $ 88,664
Taxes in excess of the U.S. tax rate on foreign
  earnings.........................................    77,038      77,613      56,353
AMT................................................     4,666       2,393       2,935
Domestic operating losses generating no tax
  benefit..........................................     3,591      16,156
NOL Benefit........................................   (19,100)
AMT credit carryforward............................   (28,450)
All other items, net...............................     1,435      (2,014)      3,025
                                                     --------    --------    --------
                                                     $133,436    $226,812    $150,977
                                                     ========    ========    ========
</TABLE>
 
                                       50
<PAGE>   51
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     Deferred tax liabilities (assets) are comprised of the effects of temporary
differences as follows:
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                              ------------------------
                                                                 1997          1996
                                                              ----------    ----------
<S>                                                           <C>           <C>
Gross deferred tax liabilities:
  Property differences pertaining to depreciation and other
     expenditures...........................................   $439,539      $457,112
Gross deferred tax assets:
  NOL carryforwards.........................................    (41,059)      (40,128)
  AMT credit................................................    (28,450)      (23,854)
  U.K. Corporation Tax effect of deferred Petroleum Revenue
     Tax....................................................    (26,726)      (30,439)
  Dismantlement and removal provision.......................    (43,384)      (35,139)
                                                               --------      --------
          Total before valuation allowance..................   $299,920      $327,552
Less: valuation allowance...................................     21,959        63,982
                                                               --------      --------
          Total -- net......................................   $321,879      $391,534
                                                               ========      ========
</TABLE>
 
NOTE 10 -- PENSION BENEFITS
 
     The Union Texas Petroleum Salaried Employees' Pension Plan (the "Pension
Plan") covers substantially all employees. Plan benefits are generally based on
years of service and an employee's compensation levels during the last years of
employment. The Company's funding policy is to contribute annually an amount at
least equal to the minimum funding requirement of the Employee Retirement Income
Security Act of 1974.
 
     The Union Texas Petroleum Supplemental Retirement Plans ("Supplemental
Retirement Plans") cover certain employees whose pension benefits were affected
by changes in the Internal Revenue Code of 1986, as amended, and certain other
benefit limitations of the Internal Revenue Code. The supplemental plans are
unfunded.
 
                                       51
<PAGE>   52
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     The Pension Plan has assets in excess of the projected benefit obligation.
The assets of this plan are held by trustees and are invested in common stock,
fixed rate and real estate investments. The following table sets forth the
plans' funded status at December 31, 1997 and 1996:
 
<TABLE>
<CAPTION>
                                                                       SUPPLEMENTAL
                                                 PENSION PLAN        RETIREMENT PLANS
                                              -------------------    -----------------
                                                1997       1996       1997      1996
                                              --------   --------    -------   -------
<S>                                           <C>        <C>         <C>       <C>
Actuarial present value of benefit
  obligations:
  Vested benefits...........................  $117,666   $114,078    $ 4,917   $ 4,273
  Nonvested benefits........................     6,206      4,692        318       246
                                              --------   --------    -------   -------
          Total accumulated benefit
            obligation......................   123,872    118,770      5,235     4,519
  Amounts related to projected pay
     increases..............................    10,516      9,584      2,999     2,254
                                              --------   --------    -------   -------
          Total projected benefit
            obligation......................   134,388    128,354      8,234     6,773
Net assets available for plan benefits held
  by trustees...............................   154,395    136,623
                                              --------   --------    -------   -------
Net assets over (under) projected benefit
  obligation................................    20,007      8,269     (8,234)   (6,773)
Unrecognized net obligation at the date of
  initial application of FAS 87 (1/1/86)....       931      1,241
Unrecognized prior service cost.............     2,504      2,670        512       917
Adjustment required to recognize minimum
  liability.................................                          (1,130)   (1,574)
Unrecognized net (gain) loss................   (19,725)    (6,682)     3,617     2,911
                                              --------   --------    -------   -------
  Prepaid pension cost (pension
     liability).............................  $  3,717   $  5,498    $(5,235)  $(4,519)
                                              ========   ========    =======   =======
</TABLE>
 
     Net periodic pension cost for 1997, 1996 and 1995 included the following
components:
 
<TABLE>
<CAPTION>
                                                       1997        1996        1995
                                                     --------    --------    --------
<S>                                                  <C>         <C>         <C>
Service cost-benefits earned during the period.....  $  2,824    $  2,917    $  2,310
Interest cost on projected benefit obligation......     9,752      10,015      10,469
Return on plan assets..............................   (27,850)    (19,113)    (30,625)
Net amortization and deferral......................    18,663       9,635      22,560
                                                     --------    --------    --------
Net periodic pension cost before effect of
  settlement loss, curtailment loss and termination
  benefits.........................................     3,389       3,454       4,714
Settlement loss (gain).............................       458        (822)
Curtailment loss...................................                   359
Termination benefits...............................       176       2,586
                                                     --------    --------    --------
Net periodic pension cost..........................  $  4,023    $  5,577    $  4,714
                                                     ========    ========    ========
</TABLE>
 
     The 1996 settlement gain, curtailment loss and the termination benefits
resulted from a 1996 voluntary retirement program. In 1996, the Company offered
a voluntary retirement program for 77 of its 1,100 employees who met certain
criteria and were either nearing retirement eligibility or were already
eligible, providing such employees the special one-time opportunity to retire
with enhanced benefits. A total of 47 employees elected to participate in the
program.
 
     The assumed average rate of return on plan assets was 8% in 1997, 1996 and
1995 for the plans. Measurement of the projected benefit obligation was based on
an assumed discount rate of 7% and 7% in 1997,
 
                                       52
<PAGE>   53
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
7.25% and 7% in 1996 and 7.25% and 7% in 1995 for normal and lump sum eligible
participants, respectively, for the Pension and Supplemental Retirement Plans
and an assumed long-term rate of compensation increase of 5%, 5% and 4.5% for
the Pension and Supplemental Retirement Plans in 1997, 1996 and 1995,
respectively.
 
NOTE 11 -- OTHER POSTRETIREMENT BENEFITS
 
     The Company currently provides postretirement benefits, principally health
care and life insurance benefits, for employees. Under the Company's current
policy, substantially all of the Company's employees may become eligible for
those benefits if they reach normal retirement age with ten years of service
while working for the Company. These benefits are unfunded.
 
     The following table sets forth the plan's status at December 31:
 
<TABLE>
<CAPTION>
                                                                1997        1996
                                                              --------    --------
<S>                                                           <C>         <C>
Accumulated postretirement benefit obligation:
  Retirees' benefits........................................  $ 32,500    $ 33,501
  Other fully eligible participants' benefits...............     3,023       3,465
  Other active plan participants' benefits..................     6,444       6,405
                                                              --------    --------
     Accumulated postretirement benefit obligation..........   (41,967)    (43,371)
Unrecognized amounts:
  Prior service cost........................................    (3,936)     (7,831)
  Net loss..................................................    11,061      13,692
                                                              --------    --------
Accrued obligation..........................................  $(34,842)   $(37,510)
                                                              ========    ========
</TABLE>
 
     Net postretirement benefit cost for 1997, 1996 and 1995 included the
following components:
 
<TABLE>
<CAPTION>
                                                         1997       1996       1995
                                                        -------    -------    -------
<S>                                                     <C>        <C>        <C>
Service cost-benefits earned during the period........  $   579    $   603    $   503
Interest cost on projected benefit obligation.........    2,894      2,901      3,117
Net amortization......................................   (3,276)    (3,094)    (3,136)
                                                        -------    -------    -------
Net postretirement benefit cost.......................  $   197    $   410    $   484
                                                        =======    =======    =======
</TABLE>
 
     Measurement of the accumulated postretirement benefit obligation was based
on an assumed discount rate of 7% for 1997, 7.25% for 1996 and 7.25% for 1995.
For measurement purposes, a 10.5%, 11.25% and 12% annual rate of increase in the
per capita cost of covered health care benefits for those age 65 and older were
assumed for 1997, 1996 and 1995, respectively; the rate was assumed to decrease
linearly to 6% for 2003 and after. The health care cost trend rate assumption
has a significant effect on the amounts reported. Increasing the assumed health
care cost trend rates by 1% in each year would increase the accumulated
postretirement benefit obligation as of December 31, 1997 and 1996, by $1,808
and $1,898, respectively. Additionally, it would increase the aggregate of the
service and interest cost components of net periodic postretirement benefit cost
for the years ended December 31, 1997, 1996 and 1995 by $192, $201 and $216,
respectively.
 
NOTE 12 -- STOCK OPTIONS
 
     The Company has four stock-based compensation plans, which are described
below. The Company applies Accounting Principles Board Opinion No. 25 and
related interpretations in accounting for its plans and adopted the footnote
disclosure-only provisions of SFAS No. 123, "Accounting for Stock-Based
Compensation". Accordingly, no compensation expense has been recognized for its
fixed stock option plans other than options granted with attached stock
appreciation rights, which may, at the employees' option be settled in cash
 
                                       53
<PAGE>   54
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
or the issuance of stock. Had compensation cost for the Company's stock based
compensation plans been determined based on the fair value at the grant dates
for awards under those plans consistent with the method of SFAS No. 123, the
Company's net income and earnings per share would have been reduced to the pro-
forma amounts indicated below:
 
<TABLE>
<CAPTION>
                                            1997        1996        1995
                                          --------    --------    --------
<S>                                       <C>         <C>         <C>
Net income
  As Reported...........................  $135,866    $152,227    $102,350
  Pro Forma.............................  $132,550    $151,188    $102,350*
Basic earnings per share
  As Reported...........................  $   1.60    $   1.75    $   1.17
  Pro Forma.............................  $   1.56    $   1.73    $   1.17*
Diluted earnings per share
  As Reported...........................  $   1.59    $   1.74    $   1.16
  Pro Forma.............................  $   1.55    $   1.73    $   1.16*
</TABLE>
 
- ---------------
 
* No impact on 1995 net income or earnings per share since no stock options
  granted after 1994 vested during 1995.
 
     The Company has four fixed stock option plans. Under the terms of the 1994
Incentive Plan, the Company has authorized the issuance of options to employees
and certain members of the board of directors to purchase up to 4 million shares
of common stock. Options are exercisable for a maximum period of ten years at an
exercise price of not less than the fair market value of the underlying common
stock at the time of the grant. The options granted to employees vest at 25% per
annum. A total of 1,613,200 options were granted in October 1997, at $23.03125
per share to all U.S.-based employees. Certain officers have been granted
nonqualified options and incentive stock options with appreciation rights. At
December 31, 1997, options outstanding with respect to 1,381,100 shares of
common stock have appreciation rights attached. Following the adoption of the
1994 Incentive Plan during 1995, all further stock option grants will be made
under the 1994 Incentive Plan only. In 1997, 5,000 options at $18.4375, 17,000
options at $19.75 and 5,000 options at $20.6875 were granted to certain
directors and these options are 100% vested.
 
     Under the terms of the 1992 Stock Option Plan, the Company authorized the
issuance of options to employees to purchase up to 4 million shares of common
stock. Options are exercisable for a maximum period of ten years at an exercise
price of not less than the fair market value of the underlying common stock at
the time of the grant. Options granted prior to 1994 vest at 20% per annum.
Options granted in 1994 vest at 25% per annum. At December 31, 1997, options
outstanding with respect to 547,800 shares of common stock have appreciation
rights attached.
 
     Under the terms of the 1985 Stock Option Plan (the "1985 Plan"), the
Company authorized the issuance of options to officers and key employees to
purchase up to 4,466,667 shares of common stock. Options are exercisable for a
maximum period of ten years at an exercise price of not less than the fair
market value of the underlying common stock at the time of the grant. Certain
officers have been granted options with appreciation rights. All options granted
are fully vested. At December 31, 1997, options outstanding with respect to
221,273 shares of common stock have appreciation rights attached.
 
     Under the terms of the 1987 Stock Option Plan, the Company authorized the
issuance of options to purchase up to 1,333,333 shares of common stock to
certain employees not covered under the 1985 Plan. Options are exercisable for a
maximum period of ten years at an exercise price of not less than the fair
market value of the underlying common stock at the time of the grant. All
options granted are fully vested.
 
                                       54
<PAGE>   55
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     The fair value of each option grant is estimated on the date of the grant
using the Black-Scholes option-pricing model with the following weighted-average
assumptions used for grants in 1997, 1996 and 1995; dividend yield of 1.03%,
expected volatility of 25.45%, 25.32% and 25.32%, risk-free interest rates of
6.00%, 6.36% and 5.87%, and expected lives of 5.5, 6 and 6 years, respectively.
 
     A summary of the status of the Company's four fixed stock option plans as
of December 31, 1997, 1996 and 1995 and changes during the years ending on those
dates is presented below:
 
<TABLE>
<CAPTION>
                                          1997                     1996                     1995
                                 ----------------------   ----------------------   ----------------------
                                              WEIGHTED-                WEIGHTED-                WEIGHTED-
                                               AVERAGE                  AVERAGE                  AVERAGE
                                              EXERCISE                 EXERCISE                 EXERCISE
                                   SHARES       PRICE       SHARES       PRICE       SHARES       PRICE
                                 ----------   ---------   ----------   ---------   ----------   ---------
<S>                              <C>          <C>         <C>          <C>         <C>          <C>
Outstanding at beginning of
  year.........................   5,088,617    $18.89      4,172,595    $18.08      3,535,396    $17.97
Granted........................   1,613,200     23.03      1,252,300     21.06        896,200     18.06
Exercised......................     485,389     17.09        260,628     16.17        164,274     14.97
Canceled.......................      80,655     20.01         75,650     19.34         94,727     19.25
                                 ----------               ----------               ----------
Outstanding at end of year.....   6,135,773     20.11      5,088,617     18.89      4,172,595     18.08
                                 ==========               ==========               ==========
Options Exercisable at
  year-end.....................   2,878,446                2,319,023                1,787,941
Weighted-average fair value of
  options granted during the
  year.........................  $     7.46               $     7.43               $     6.06
</TABLE>
 
     The following table summarizes information about the four fixed stock
option plans at December 31, 1997:
 
<TABLE>
<CAPTION>
                                  OPTIONS OUTSTANDING                       OPTIONS EXERCISABLE
                   -------------------------------------------------   ------------------------------
                     NUMBER      WEIGHTED-AVERAGE                        NUMBER
    RANGE OF       OUTSTANDING      REMAINING       WEIGHTED-AVERAGE   EXERCISABLE   WEIGHTED-AVERAGE
 EXERCISE PRICES   AT 12/31/97   CONTRACTUAL LIFE    EXERCISE PRICE    AT 12/31/97    EXERCISE PRICE
- -----------------  -----------   ----------------   ----------------   -----------   ----------------
<S>                <C>           <C>                <C>                <C>           <C>
  $12.25-16.125       455,428    1.9 years               $14.29           455,428         $14.29
$18.0625-23.03125   5,680,345    7.9                      20.58         2,423,018          19.31
                    ---------                                           ---------
 $12.25-23.03125    6,135,773    7.5                      20.11         2,878,446          18.52
                    =========                                           =========
</TABLE>
 
NOTE 13 -- MAJOR CUSTOMERS
 
     During 1997, the Company's U.K. operations had sales to Texaco Limited, in
the amount of $105,705 or 12% of the Company's total sales and operating
revenues. During 1996, the Company's U.K. operations had sales to Elf Trading,
in the amount of $120,805 or 12%, of total sales and operating revenues. During
1995, the Company's U.K. operations had sales to B.P. Oil International Limited
and Elf Trading in the amount of $107,891 and $109,067, 13% and 13%,
respectively, of total sales and operating revenues.
 
NOTE 14 -- SHAREHOLDERS EQUITY
 
  Preferred Stock
 
     The Company is authorized to issue up to 15,000,000 shares of preferred
stock. The Board of Directors of the Company without further approval of the
shareholders, can authorize the issuance, at any time or from time to time, of
one or more series of preferred stock and determine the number of shares in each
series and the designations, powers, rights, preferences and any qualifications,
limitations and restrictions of each series. Among the specific matters which
may be determined, if any, by the Board of Directors are: dividend rights,
conversion or exchange rights, voting rights, rights and terms of redemption
(including sinking fund provisions) and rights upon liquidation or distribution
of the assets of the Company.
 
                                       55
<PAGE>   56
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
  Stockholder Rights Plan
 
     In September 1997, the Company adopted a rights agreement (the "Rights
Agreement") whereby a dividend of one Common Stock Purchase Right (a "Right")
was paid for each outstanding share of the Company's Common Stock. The Rights
will be exercisable only if a person acquires beneficial ownership of 15 percent
or more of the Company's Common Stock (an "Acquiring Person"), or commences a
tender offer which would result in beneficial ownership of 15 percent or more of
such stock. When they become exercisable, each Right entitles the registered
holder to purchase from the Company one-half of one share of Common Stock at a
price of $90.00 per full share of Common Stock, subject to adjustment under
certain circumstances.
 
     Upon the occurrence of certain events specified in the Rights Agreement,
each holder of a Right (other than an Acquiring Person) will have the right to
purchase, at the Right's then current exercise price, shares of the Company's
Common Stock having a value of twice the Right's exercise price. In addition,
if, after a person becomes an Acquiring Person, the Company is involved in a
merger or other business combination transactions with another person in which
the Company is not the surviving corporation, or under certain other
circumstances, each Right will entitle its holder to purchase, at the Right's
then current exercise price, shares of common stock of the other person having a
value of twice the Right's exercise price.
 
     Unless redeemed by the Company earlier, the Rights will expire on September
30, 2007. The Company will generally be entitled to redeem the Rights in whole,
but not in part, at $0.001 per Right, subject to adjustment. No Rights were
exercisable under the Rights Agreement at December 31, 1997.
 
     The terms of the Rights generally may be amended by the Company without the
approval of the holders of the Rights prior to the public announcement by the
Company or an Acquiring Person that a person has become an Acquiring Person.
Before such announcement, the terms may be amended only to (i) cure any
ambiguity; (ii) correct or supplement any provision which may be defective or
inconsistent with other provisions; or (iii) change or supplement the provisions
in any manner which the Company deems necessary or desirable, so long as such
change does not adversely affect the interest of the holders of the Rights.
 
                                       56
<PAGE>   57
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
NOTE 15 -- SEGMENT FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                                    EXPLORATION AND PRODUCTION
                                 ----------------------------------------------------------------
                                  UNITED                                                  OTHER      PETRO-
                                  STATES    UNITED                                        INTER-    CHEMICALS
                                 (ALASKA)   KINGDOM   INDONESIA   VENEZUELA   PAKISTAN   NATIONAL      (a)      OTHER(a)   TOTAL
                                 --------   -------   ---------   ---------   --------   --------   ---------   --------   ------
                                                                      (DOLLARS IN MILLIONS)
<S>                              <C>        <C>       <C>         <C>         <C>        <C>        <C>         <C>        <C>
1997
Sales and operating revenues...             $  367      $287                    $66                   $188        $  1     $  909
                                            ======      ====                    ===                   ====        ====     ======
Operating profit (loss)........    $(3)     $  126      $192                    $24        $(88)      $ 32        $ (4)    $  279
Interest income................                  2         1                                                                    3
General and administrative
  expenses.....................                                                                                    (27)       (27)
Interest expense...............                 (1)                              (1)                                (5)        (7)
Net Income (loss) of equity
  investees....................                           24                                                        (3)        21
                                   ---      ------      ----                    ---        ----       ----        ----     ------
Income (loss) before income
  taxes........................     (3)        127       217                     23         (88)        32         (39)       269
Income taxes (benefit).........                 59       111                      4                     12         (53)       133
                                   ---      ------      ----                    ---        ----       ----        ----     ------
Net income (loss)..............    $(3)     $   68      $106                    $19        $(88)      $ 20        $ 14     $  136
                                   ===      ======      ====                    ===        ====       ====        ====     ======
Identifiable assets............    $38      $1,156      $415        $126        $67        $ 43       $134        $ 43     $2,022
Capital additions..............     15         103        31         124         11          32         29           5        350
Depreciation, depletion and
  amortization.................      1         150        38                     11           7          7           2        216
1996
Sales and operating revenues...             $  406      $341                    $66                   $193        $  2     $1,008
                                            ======      ====                    ===                   ====        ====     ======
Operating profit (loss)........    $(8)     $  163      $233                    $39        $(33)      $ 24        $(15)    $  403
Interest income................                  1         1                                                                    2
General and administrative
  expenses.....................                                                                                    (27)       (27)
Interest expense...............                 (4)                              (1)                               (20)       (25)
Net income of equity
  investee.....................                           26                                                                   26
                                   ---      ------      ----                    ---        ----       ----        ----     ------
Income (loss) before income
  taxes........................     (8)        160       260                     38         (33)        24         (62)       379
Income taxes (benefit).........                 75       139                     11                      9          (7)       227
                                   ---      ------      ----                    ---        ----       ----        ----     ------
Net income (loss)..............    $(8)     $   85      $121                    $27        $(33)      $ 15        $(55)    $  152
                                   ===      ======      ====                    ===        ====       ====        ====     ======
Identifiable assets............    $23      $1,244      $444                    $60        $ 15       $116        $ 40     $1,942
Capital additions..............     11         119        23                     15           7          8           3        186
Depreciation, depletion and
  amortization.................      1         156        39                      7           1          6           2        212
1995
Sales and operating revenues...             $  323      $276                    $51        $  1       $200        $  1     $  852
                                            ======      ====                    ===        ====       ====        ====     ======
Operating profit (loss)........    $(6)     $   84      $178                    $19        $(49)      $ 62        $ (5)    $  283
Interest income................                  2         1                                                         1          4
General and administrative
  expenses.....................                                                                                    (26)       (26)
Interest expense...............                 (6)                              (1)                               (22)       (29)
Net income of equity
  investee.....................                           21                                                                   21
                                   ---      ------      ----                    ---        ----       ----        ----     ------
Income (loss) before income
  taxes........................     (6)         80       200                     18         (49)        62         (52)       253
Income taxes (benefit).........                 34       105                      4                     24         (16)       151
                                   ---      ------      ----                    ---        ----       ----        ----     ------
Net income (loss)..............    $(6)     $   46      $ 95                    $14        $(49)      $ 38        $(36)    $  102
                                   ===      ======      ====                    ===        ====       ====        ====     ======
Identifiable assets............    $13      $1,168      $459                    $46        $  9       $111        $ 31     $1,837
Capital additions..............      6         353        30                     10           2          7           1        409
Depreciation, depletion and
  amortization.................                139        35                      7           4          5           2        192
</TABLE>
 
- ---------------
 
(a)  Petrochemical operations and Other represent United States activities.
 
NOTE 16 -- COMMITMENTS
 
     The Company has entered into various commitments and operating agreements
related to the development of and production from certain proved oil and gas
properties. Also during the normal course of business, the Company has issued
various letters of credit, bank guarantees and performance bonds, which at
December 31, 1997, totaled $8 million. At December 31, 1997, the Company had
open foreign exchange contracts with a net value of 7 million pounds sterling.
These contracts hedge economic exposures, based on the Company's assessment of
its net exposure to changes in foreign currency rates. It is management's belief
 
                                       57
<PAGE>   58
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
that such commitments and guarantees will be met without material adverse effect
on the Company's financial position.
 
     The amounts of operating lease obligations due during the five years 1998
through 2002 are $8,283, $7,788, $5,705, $1,065 and $1,093, respectively.
 
     Rental expense for the years 1997, 1996 and 1995 was $9,810, $8,783, and
$9,379, respectively.
 
NOTE 17 -- CONTINGENCIES
 
     The Company and its subsidiaries and related companies are named defendants
in a number of lawsuits and named parties in numerous governmental proceedings
arising in the ordinary course of business.
 
     While the outcome of such contingencies, lawsuits or other proceedings
against the Company cannot be predicted with certainty, management expects that
such liability, to the extent not provided for through insurance or otherwise,
will not have a material adverse effect on the financial statements of the
Company.
 
NOTE 18 -- SUPPLEMENTARY QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
<TABLE>
<CAPTION>
                                                     1997                                        1996
                                                QUARTER ENDED                               QUARTER ENDED
                             ----------------------------------------------------   ------------------------------
                             MAR. 31    JUNE 30    SEPT. 30   DEC. 31      YEAR     MAR. 31    JUNE 30    SEPT. 30
                             --------   --------   --------   --------   --------   --------   --------   --------
<S>                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Net sales and operating
  revenues.................  $282,021   $211,686   $182,843   $232,841   $909,391   $258,178   $223,192   $227,284
Gross profit...............   144,800     87,336     71,750     96,017    399,903    126,518     96,052    100,659
Net income (loss)..........    63,770     25,349     48,047     (1,300)   135,866     47,561     30,837     33,521
Per share of common stock:
  Net earnings (basic).....       .74        .30        .57       (.02)      1.60        .54        .35        .39
  Net earnings (diluted)...       .74        .30        .56       (.02)      1.59        .54        .35        .38
  Dividends................       .05        .05        .05        .05        .20        .05        .05        .05
Market price:
  High.....................        23 7/8     21 3/8     24 9/16    24 1/2     24 9/16    20 1/4     20 1/4   21 3/4
  Low......................        17 15/16   17 1/4     19 7/8     20         17 1/4     17 5/8     18       18 5/8
 
<CAPTION>
                                     1996
                                 QUARTER ENDED
                             ---------------------
                             DEC. 31       YEAR
                             --------   ----------
<S>                          <C>        <C>
Net sales and operating
  revenues.................  $299,822   $1,008,476
Gross profit...............   144,915      468,144
Net income (loss)..........    40,308      152,227
Per share of common stock:
  Net earnings (basic).....       .47         1.75
  Net earnings (diluted)...       .46         1.74
  Dividends................       .05          .20
Market price:
  High.....................        23           23
  Low......................        20 5/8       17 5/8
</TABLE>
 
Source of Market Prices: New York Stock Exchange Composite Transactions Tape
 
NOTE 19 -- SUPPLEMENTARY OIL AND GAS INFORMATION
 
  Reserve estimation -- (Unaudited)
 
     Oil and gas reserves cannot be measured exactly. Reserve estimates are
based on many factors related to reservoir performance which require evaluation
by the engineers interpreting the available data, as well as price, costs and
other economic factors. The reliability of these estimates at any point in time
depends on both the quality and quantity of the technical and economic data, the
production performance of the reservoirs as well as extensive engineering
judgement. Consequently, reserve estimates are subject to revision as additional
data becomes available during the producing life of a reservoir. When a
commercial reservoir is discovered, proved reserves are initially determined
based on only limited data from the first well or wells. Further drilling may
better define the extent of the reservoir and additional production performance,
well tests and engineering studies will likely improve the reliability of the
estimate.
 
     Reserves are considered proved if economic producibility is supported by
either actual production or conclusive formation tests. Proved developed
reserves are reserves that can be expected to be recovered through existing
wells with existing equipment and operating methods. Proved undeveloped reserves
are reserves that are expected to be recovered from new wells on undrilled
acreage or from existing wells where a relatively significant expenditure is
required to permit production. These estimates do not include reserves
 
                                       58
<PAGE>   59
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
which may be found by extension of proved areas or reserves recoverable by
secondary or tertiary recovery methods unless these methods are in operation and
showing successful results.
 
     In 1997 the Company led a successful bid for Venezuela's Boqueron area
under Venezuela's Third Operating Agreement Round, adding 40 million barrels of
oil to its proved reserves at year end 1997. Information regarding Venezuelan
reserves relates to the Company's net interest in an operating service contract
for the Boqueron area between the Company, the other contractor and a subsidiary
of the national oil company, PDVSA. The Government of Venezuela retains full
ownership of all hydrocarbons. The Company will receive a service fee for each
barrel of crude oil produced from the Boqueron area, which consists of the
following two components: (i) a set fee for the baseline production and (ii) a
sliding incentive fee for the incremental production, as well as cost recovery
for field and other capital and operating costs. The reserves table does not
include the proved reserves associated with the DZO unit, which were recorded in
February 1998.
 
     In 1996, the Company and co-venturers ARCO Alaska, Inc. (operator) and
Anadarko Petroleum Corp. announced plans to develop the Alpine oil field in
Alaska. In 1996, the Company recorded 32 million net barrels in proved
undeveloped oil reserves from the Alpine field which is scheduled to begin
production in the first part of 2000.
 
     In 1995, the Company purchased an interest in the Alba field in the U.K.
North Sea, adding at July 1, 1995, 45 million barrels of oil equivalent ("boe").
 
     In 1994, the Company purchased an interest in the undeveloped Britannia
field in the U.K. North Sea, adding at year end 1994, 38 million boe to its
proved reserves.
 
     Information presented for the Company's operations in Indonesia relates to
a production sharing contract between a joint venture group in which the Company
is a member and Pertamina. Debt service relating to the Indonesian facility
which liquefies natural gas supplied by the joint venture and other production
sharing contractors is accounted for by the Company as a cost of production and
operation. The debt obligation is non-recourse to the Company. Such debt service
is deducted in estimating future net revenues to be distributed among Pertamina
and the production sharing contractors including the joint venture and the
Company's interest therein. The joint venture has no ownership interest in the
oil and gas reserves but does have the right to share revenues and/or production
and is entitled to recover most field and other operating costs and capital
depreciation. Indonesian reserves associated with the Unimar partnership are
shown under the caption "Non-Consolidated Interests." The reserve estimates,
which are based on year-end prices, are subject to revision as product prices
and costs fluctuate due to the cost recovery feature under the production
sharing contract. The impact on reserves is inversely related to price changes
and directly related to changes in field operating and capital costs. In
addition, reserve estimates are subject to revision due to the effect that price
fluctuations generally have on estimates of recoverable reserves.
 
     "Other International" represents an interest in Egypt, which was sold in
December 1996.
 
                                       59
<PAGE>   60
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     The Company's net quantities of proved developed and undeveloped reserves
of oil and natural gas, by geographic areas and changes therein, were as
follows:
 
 ESTIMATED QUANTITIES OF NET PROVED CRUDE OIL AND NATURAL GAS LIQUIDS RESERVES
<TABLE>
<CAPTION>
                                                        CONSOLIDATED SUBSIDIARIES
                            ----------------------------------------------------------------------------------
                             UNITED
                             STATES    UNITED                                              OTHER
                            (ALASKA)   KINGDOM   INDONESIA   VENEZUELA(a)   PAKISTAN   INTERNATIONAL    TOTAL
                            --------   -------   ---------   ------------   --------   -------------   -------
                                                          (THOUSANDS OF BARRELS)
<S>                         <C>        <C>       <C>         <C>            <C>        <C>             <C>
YEAR ENDED DECEMBER 31, 1997
Net proved reserves
  -- beginning of year....   32,005    90,514     16,949             0        6,746           0        146,214
  -- revisions of previous
    estimates.............              2,117      4,412                      1,510                      8,039
  -- extensions,
    discoveries and other
    additions.............                                                        3                          3
  -- purchase of minerals
    in place..............                                      40,000                                  40,000
  -- production...........             (15,976)   (2,113)                    (2,413)                   (20,502)
                             ------    -------    ------        ------       ------         ---        -------
Net proved reserves
  -- end of year..........   32,005    76,655     19,248        40,000        5,846           0        173,754
                             ======    =======    ======        ======       ======         ===        =======
Net proved developed
  reserves
  -- beginning of year....             51,265     12,071             0        4,839           0         68,175
  -- end of year..........             40,835     17,473        40,000        4,206           0        102,514
YEAR ENDED DECEMBER 31, 1996
Net proved reserves
  -- beginning of year....             105,714    18,942                      4,383          19        129,058
  -- revisions of previous
    estimates.............               (546)        42                      3,589          (4)         3,081
  -- extensions,
    discoveries and other
    additions.............   32,005     1,498                                 1,053                     34,556
  -- production...........             (16,152)   (2,035)                    (2,279)        (15)       (20,481)
                             ------    -------    ------                     ------         ---        -------
Net proved reserves
  -- end of year..........   32,005    90,514     16,949                      6,746           0        146,214
                             ======    =======    ======                     ======         ===        =======
Net proved developed
  reserves
  -- beginning of year....             67,147     17,041                      3,215          19         87,422
  -- end of year..........             51,265     12,071                      4,839           0         68,175
YEAR ENDED DECEMBER 31, 1995
Net proved reserves
  -- beginning of year....             73,862     19,142                      3,842          32         96,878
  -- revisions of previous
    estimates.............              1,995      1,894                      1,275           9          5,173
  -- extensions,
    discoveries and other
    additions.............                                                    1,261                      1,261
  -- purchase of minerals
    in place..............             45,012                                                           45,012
  -- production...........             (15,155)   (2,094)                    (1,995)        (22)       (19,266)
                                       -------    ------                     ------         ---        -------
Net proved reserves
  -- end of year..........             105,714    18,942                      4,383          19        129,058
                                       =======    ======                     ======         ===        =======
Net proved developed
  reserves
  -- beginning of year....             56,773     17,247                      2,714          32         76,766
  -- end of year..........             67,147     17,041                      3,215          19         87,422
 
<CAPTION>
 
                                NON-
                            CONSOLIDATED     TOTAL
                             INTERESTS     WORLDWIDE
                            ------------   ---------
                             (THOUSANDS OF BARRELS)
<S>                         <C>            <C>
YEAR ENDED DECEMBER 31, 19
Net proved reserves
  -- beginning of year....     6,986        153,200
  -- revisions of previous
    estimates.............     1,778          9,817
  -- extensions,
    discoveries and other
    additions.............                        3
  -- purchase of minerals
    in place..............                   40,000
  -- production...........      (699)       (21,201)
                               -----        -------
Net proved reserves
  -- end of year..........     8,065        181,819
                               =====        =======
Net proved developed
  reserves
  -- beginning of year....     4,944         73,119
  -- end of year..........     7,316        109,830
YEAR ENDED DECEMBER 31, 19
Net proved reserves
  -- beginning of year....     7,711        136,769
  -- revisions of previous
    estimates.............       (52)         3,029
  -- extensions,
    discoveries and other
    additions.............                   34,556
  -- production...........      (673)       (21,154)
                               -----        -------
Net proved reserves
  -- end of year..........     6,986        153,200
                               =====        =======
Net proved developed
  reserves
  -- beginning of year....     6,926         94,348
  -- end of year..........     4,944         73,119
YEAR ENDED DECEMBER 31, 19
Net proved reserves
  -- beginning of year....     7,571        104,449
  -- revisions of previous
    estimates.............       832          6,005
  -- extensions,
    discoveries and other
    additions.............                    1,261
  -- purchase of minerals
    in place..............                   45,012
  -- production...........      (692)       (19,958)
                               -----        -------
Net proved reserves
  -- end of year..........     7,711        136,769
                               =====        =======
Net proved developed
  reserves
  -- beginning of year....     6,835         83,601
  -- end of year..........     6,926         94,348
</TABLE>
 
- ---------------
 
(a)  The Company's Venezuelan reserves reflect the Company's net interest in an
     operating service fee contract for the Boqueron area between the Company,
     the other contractor and a subsidiary of PDVSA. The Company's February 1998
     acquisition of an interest in the operating service contract for the DZO
     unit with net proved reserves of 114 million barrels, is not included.
 
                                       60
<PAGE>   61
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
            ESTIMATED QUANTITIES OF NET PROVED NATURAL GAS RESERVES
 
<TABLE>
<CAPTION>
                                                        CONSOLIDATED SUBSIDIARIES
                                               --------------------------------------------       NON-
                                               UNITED                                         CONSOLIDATED      TOTAL
                                               KINGDOM   INDONESIA     PAKISTAN     TOTAL      INTERESTS      WORLDWIDE
                                               -------   ---------     --------   ---------   ------------    ---------
                                                                       (MILLIONS OF CUBIC FEET)
<S>                                            <C>       <C>           <C>        <C>         <C>             <C>
YEAR ENDED DECEMBER 31, 1997
Net proved reserves
  -- beginning of year.......................  363,472    846,744      120,027    1,330,243     351,506       1,681,749
  -- revisions of previous estimates.........  19,361      16,433       12,228       48,022       7,334          55,356
  -- extensions, discoveries and other
     additions...............................                              986          986                         986
  -- production..............................  (10,641)   (82,088)     (13,347)    (106,076)    (27,171)       (133,247)
                                               -------    -------      -------    ---------     -------       ---------
Net proved reserves
  -- end of year.............................  372,192    781,089      119,894    1,273,175     331,669       1,604,844
                                               =======    =======      =======    =========     =======       =========
Net proved developed reserves
  -- beginning of year.......................  126,963    718,721       57,019      902,703     297,841       1,200,544
  -- end of year.............................  124,843    670,415       75,107      870,365     284,535       1,154,900
YEAR ENDED DECEMBER 31, 1996
Net proved reserves
  -- beginning of year.......................  344,132    898,374      121,422    1,363,928     365,079       1,729,007
  -- revisions of previous estimates.........   4,407      44,909       10,846       60,162      18,352          78,514
  -- extensions, discoveries and other
     additions...............................  31,791                    2,904       34,695                      34,695
  -- production..............................  (16,858)   (96,539)(a)  (15,145)    (128,542)    (31,925)(a)    (160,467)
                                               -------    -------      -------    ---------     -------       ---------
Net proved reserves
  -- end of year.............................  363,472    846,744(a)   120,027    1,330,243     351,506(a)    1,681,749
                                               =======    =======      =======    =========     =======       =========
Net proved developed reserves
  -- beginning of year.......................  139,413    758,942       58,642      956,997     307,102       1,264,009
  -- end of year.............................  126,963    718,721       57,019      902,703     297,841       1,200,544
YEAR ENDED DECEMBER 31, 1995
Net proved reserves
  -- beginning of year.......................  319,621    972,796       97,895    1,390,312     385,834       1,776,146
  -- revisions of previous estimates.........  37,079      19,270       24,976       81,325      10,228          91,553
  -- extensions, discoveries and other
     additions...............................                           14,952       14,952                      14,952
  -- production..............................  (12,568)   (93,692)(a)  (16,401)    (122,661)    (30,983)(a)    (153,644)
                                               -------    -------      -------    ---------     -------       ---------
Net proved reserves
  -- end of year.............................  344,132    898,374(a)   121,422    1,363,928     365,079(a)    1,729,007
                                               =======    =======      =======    =========     =======       =========
Net proved developed reserves
  -- beginning of year.......................  149,301    812,933       51,883    1,014,117     320,502       1,334,619
  -- end of year.............................  139,413    758,942       58,642      956,997     307,102       1,264,099
</TABLE>
 
- ---------------
 
(a)  Includes gas consumed in the operation of the LNG plant, which was
     approximately 9 Bcf and 3 Bcf, 12 Bcf and 4 Bcf and 11 Bcf and 4 Bcf
     attributable to the Company and its Unimar partnership, respectively, for
     1997, 1996 and 1995; and gas sold to fertilizer plants and a refinery.
 
                                       61
<PAGE>   62
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
  Costs incurred and results of operations
 
     Costs incurred in oil and gas property acquisition, exploration and
development activities whether expensed or capitalized were as follows:
 
<TABLE>
<CAPTION>
                                                  CONSOLIDATED SUBSIDIARIES
                           ------------------------------------------------------------------------
                            UNITED                                                  OTHER                 NON-
                            STATES    UNITED                                        INTER-            CONSOLIDATED     TOTAL
                           (ALASKA)   KINGDOM   INDONESIA   VENEZUELA   PAKISTAN   NATIONAL   TOTAL    INTERESTS     WORLDWIDE
                           --------   -------   ---------   ---------   --------   --------   -----   ------------   ---------
                                                                  (DOLLARS IN MILLIONS)
<S>                        <C>        <C>       <C>         <C>         <C>        <C>        <C>     <C>            <C>
Property acquisition
  (proved and unproved)
  1997...................    $ 5(a)                           $121(e)                $21      $147                     $147
  1996...................      2                                                       3         5                        5
  1995...................      1       $275                                            2       278                      278
Exploration
  1997...................    $ 2       $  8        $ 8                    $23        $69      $110        $ 2          $112
  1996...................     13(a)       6          7                     11         28        65                       65
  1995...................     10         10          8                     11         46        85                       85
Development
  1997...................    $10(b)    $102(c)     $30(d)     $  3        $10        $ 2      $157        $10          $167
  1996...................      3        118(c)      24                     12                  157          8           165
  1995...................                78(c)      31(d)                   6                  115         10           125
</TABLE>
 
- ---------------
 
(a)  Includes $1 million for capitalized interest in 1997 and 1996,
     respectively.
 
(b)  Includes $2 million for capitalized interest.
 
(c)  Includes $32 million, $25 million and $22 million for capitalized interest
     in 1997, 1996 and 1995, respectively.
 
(d)  Includes $1 million for capitalized interest in 1997 and 1995,
     respectively.
 
(e)  Includes $4 million for capitalized interest.
 
                                       62
<PAGE>   63
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     The aggregate amount of capitalized costs (including construction in
progress) relating to oil and gas producing activities and the aggregate amount
of the related accumulated depreciation, depletion and amortization ("DD&A")
including accumulated valuation allowances at December 31, were as follows:
 
<TABLE>
<CAPTION>
                                                CONSOLIDATED SUBSIDIARIES
                             ----------------------------------------------------------------
                              UNITED                                                  OTHER                  NON-       TOTAL
                              STATES    UNITED                                        INTER-             CONSOLIDATED   WORLD-
                             (ALASKA)   KINGDOM   INDONESIA   VENEZUELA   PAKISTAN   NATIONAL   TOTAL     INTERESTS      WIDE
                             --------   -------   ---------   ---------   --------   --------   ------   ------------   ------
                                                                   (DOLLARS IN MILLIONS)
<S>                          <C>        <C>       <C>         <C>         <C>        <C>        <C>      <C>            <C>
Proved and unproved properties
  Gross capital
    1997...................    $41      $2,182      $771        $124        $105       $43      $3,266       $549       $3,815
    1996...................     37       2,129       742                      94        12       3,014        535        3,549
    1995...................     26       1,832       718                      79        15       2,670        525        3,195
  Accumulated DD&A
    (including valuation
    allowances)
    1997...................      5       1,080       472                      65         9       1,631        382        2,013
    1996...................     14         959       436                      54         2       1,465        360        1,825
    1995...................     13         733       396                      48        10       1,200        336        1,536
Proved properties
  Gross capital
    1997...................     39       2,174       762         124          96                 3,195        549        3,744
    1996...................     21       2,118       733                      88                 2,960        535        3,495
    1995...................              1,822       710                      75         4       2,611        525        3,136
  Accumulated DD&A
    1997...................      3       1,075       465                      63                 1,606        382        1,988
    1996...................                956       428                      52                 1,436        360        1,796
    1995...................                731       389                      46         4       1,170        336        1,506
</TABLE>
 
                                       63
<PAGE>   64
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     The results of operations for the Company's oil and gas producing
activities for 1997, 1996 and 1995 were as follows:
 
<TABLE>
<CAPTION>
                                                       CONSOLIDATED SUBSIDIARIES
                                      ------------------------------------------------------------
                                       UNITED                                      OTHER                 NON-
                                       STATES    UNITED                            INTER-            CONSOLIDATED     TOTAL
                                      (ALASKA)   KINGDOM   INDONESIA   PAKISTAN   NATIONAL   TOTAL    INTERESTS     WORLDWIDE
                                      --------   -------   ---------   --------   --------   -----   ------------   ---------
                                                                       (DOLLARS IN MILLIONS)
<S>                                   <C>        <C>       <C>         <C>        <C>        <C>     <C>            <C>
YEAR ENDED DECEMBER 31, 1997
  Net sales.........................              $367       $287        $66                 $720        $109         $829
                                                  ----       ----        ---                 ----        ----         ----
  Production costs..................                82         50         10                  142          13          155
  Exploration expenses..............    $ 2          8          7         21        $ 61       99           1          100
  DD&A..............................               148         38         11                  197          21          218
  Other Costs.......................                                                  20       20                       20
  Valuation allowances..............      1          2                                 7       10                       10
                                        ---       ----       ----        ---        ----     ----        ----         ----
        Total costs and expenses....      3        240         95         42          88      468          35          503
                                        ---       ----       ----        ---        ----     ----        ----         ----
                                         (3)       127        192         24         (88)     252          74          326
  Income tax expense(a).............                58        112          5                  175          50          225
                                        ---       ----       ----        ---        ----     ----        ----         ----
  Results of operations(b)..........    $(3)      $ 69       $ 80        $19        $(88)    $ 77        $ 24         $101
                                        ===       ====       ====        ===        ====     ====        ====         ====
YEAR ENDED DECEMBER 31, 1996
  Net sales.........................              $406       $341        $66                 $813        $126         $939
                                                  ----       ----        ---                 ----        ----         ----
  Production costs..................                82         60         12                  154          12          166
  Exploration expenses..............    $ 7          5          7          8        $ 25       52                       52
  DD&A..............................               154         39          6                  199          24          223
  Other Costs.......................                                                   7        7                        7
  Valuation allowances..............      2          2                                 1        5                        5
                                        ---       ----       ----        ---        ----     ----        ----         ----
        Total costs and expenses....      9        243        106         26          33      417          36          453
                                        ---       ----       ----        ---        ----     ----        ----         ----
                                         (9)       163        235         40         (33)     396          90          486
  Income tax expense(a).............                74        141         11                  226          64          290
                                        ---       ----       ----        ---        ----     ----        ----         ----
  Results of operations(b)..........    $(9)      $ 89       $ 94        $29        $(33)    $170        $ 26         $196
                                        ===       ====       ====        ===        ====     ====        ====         ====
YEAR ENDED DECEMBER 31, 1995
  Net sales.........................              $323       $276        $51        $  1     $651        $101         $752
                                                  ----       ----        ---        ----     ----        ----         ----
  Production costs..................                88         55         17                  160          12          172
  Exploration expenses..............    $ 6         10          8          7          46       77                       77
  DD&A..............................               138         35          7                  180          21          201
  Valuation allowances..............                 1                                 4        5                        5
                                        ---       ----       ----        ---        ----     ----        ----         ----
        Total costs and expenses....      6        237         98         31          50      422          33          455
                                        ---       ----       ----        ---        ----     ----        ----         ----
                                         (6)        86        178         20         (49)     229          68          297
  Income tax expense(a).............                34        105          5                  144          47          191
                                        ---       ----       ----        ---        ----     ----        ----         ----
  Results of operations(b)..........    $(6)      $ 52       $ 73        $15        $(49)    $ 85        $ 21         $106
                                        ===       ====       ====        ===        ====     ====        ====         ====
</TABLE>
 
- ---------------
 
(a)  Computed using statutory rates adjusted for permanent differences, tax
     credits and allowances that are reflected in the income tax expense for the
     respective years.
 
(b)  Excludes overhead and financing costs.
 
                                       64
<PAGE>   65
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
  Standardized measure of discounted future net cash flows -- (Unaudited)
 
     The standardized measure of discounted future net cash flows and changes
therein relating to proved oil and gas reserves for 1997, 1996 and 1995 were as
follows:
 
<TABLE>
<CAPTION>
                                                            CONSOLIDATED SUBSIDIARIES
                                         ---------------------------------------------------------------
                                          UNITED                                                               NON-        TOTAL
                                          STATES    UNITED                                                 CONSOLIDATED   WORLD-
                                         (ALASKA)   KINGDOM   INDONESIA   VENEZUELA   PAKISTAN    TOTAL     INTERESTS      WIDE
                                         --------   -------   ---------   ---------   --------   -------   ------------   -------
                                                                              (DOLLARS IN MILLIONS)
<S>                                      <C>        <C>       <C>         <C>         <C>        <C>       <C>            <C>
DECEMBER 31, 1997
  Future cash inflows..................  $   420    $2,911     $ 2,754      $ 298       $305     $ 6,688      $1,213      $ 7,901
  Future production and development
    costs..............................     (230)   (1,120)     (1,030)      (141)       (86)     (2,607)       (469)      (3,076)
  Future income tax expense............      (52)     (520)       (815)       (19)       (65)     (1,471)       (358)      (1,829)
                                         -------    -------    -------      -----       ----     -------      ------      -------
  Future net cash flows(a).............      138     1,271         909        138        154       2,610         386        2,996
  10% discount for estimated timing of
    cash flows.........................       91       569         410         73         43       1,186         181        1,367
                                         -------    -------    -------      -----       ----     -------      ------      -------
  Standardized measure of discounted
    future net cash flows..............  $    47    $  702     $   499      $  65       $111     $ 1,424      $  205      $ 1,629
                                         =======    =======    =======      =====       ====     =======      ======      =======
DECEMBER 31, 1996
  Future cash inflows..................  $   658    $3,825     $ 3,260                  $370     $ 8,113      $1,436      $ 9,549
  Future production and development
    costs..............................     (240)   (1,258)     (1,066)                  (86)     (2,650)       (493)      (3,143)
  Future income tax expense............     (142)     (804)     (1,067)                  (94)     (2,107)       (470)      (2,577)
                                         -------    -------    -------                  ----     -------      ------      -------
  Future net cash flows(a).............      276     1,763       1,127                   190       3,356         473        3,829
  10% discount for estimated timing of
    cash flows.........................     (182)     (785)       (505)                  (54)     (1,526)       (223)      (1,749)
                                         -------    -------    -------                  ----     -------      ------      -------
  Standardized measure of discounted
    future net cash flows..............  $    94    $  978     $   622                  $136     $ 1,830      $  250      $ 2,080
                                         =======    =======    =======                  ====     =======      ======      =======
DECEMBER 31, 1995
  Future cash inflows..................             $3,437     $ 2,861                  $232     $ 6,530      $1,260      $ 7,790
  Future production and development
    costs..............................             (1,291)     (1,093)                  (93)     (2,477)       (507)      (2,984)
  Future income tax expense............               (656)       (867)                  (36)     (1,559)       (382)      (1,941)
                                                    -------    -------                  ----     -------      ------      -------
  Future net cash flows(a).............              1,490         901                   103       2,494         371        2,865
  10% discount for estimated timing of
    cash flows.........................               (661)       (403)                  (30)     (1,094)       (177)      (1,271)
                                                    -------    -------                  ----     -------      ------      -------
  Standardized measure of discounted
    future net cash flows..............             $  829     $   498                  $ 73     $ 1,400      $  194      $ 1,594
                                                    =======    =======                  ====     =======      ======      =======
</TABLE>
 
- ---------------
 
(a)  Future net cash flows were computed using year-end prices and costs and
     statutory tax rates adjusted for permanent differences, tax credits and
     allowances.
 
                                       65
<PAGE>   66
                      UNION TEXAS PETROLEUM HOLDINGS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
               (DOLLARS IN THOUSANDS UNLESS OTHERWISE INDICATED)
 
     Changes in the standardized measure of discounted future net cash flows for
the consolidated subsidiaries were as follows:
 
<TABLE>
<CAPTION>
                                                            1997      1996      1995
                                                           ------    ------    ------
                                                             (DOLLARS IN MILLIONS)
<S>                                                        <C>       <C>       <C>
Beginning of year........................................  $1,830    $1,400    $1,065
Sales and transfers of oil and gas produced, net of
  production costs.......................................    (545)     (643)     (513)
Net changes in prices, development and production
  costs..................................................    (805)      673       324
Extensions, discoveries and improved recovery, less
  related costs..........................................       1       200        20
Purchase of minerals in place............................      73                 287
Development costs incurred during the period.............     109       129        92
Revisions of previous quantity estimates.................      61       133        83
Increase in present value due to passage of one year.....     306       233       185
Net change in income taxes...............................     394      (295)     (143)
                                                           ------    ------    ------
End of year..............................................  $1,424    $1,830    $1,400
                                                           ======    ======    ======
</TABLE>
 
     The standardized measure data includes estimates of oil and gas reserve
volumes and forecasts of future production rates over the reserve lives.
Estimates of future production expenditures, including taxes and future
development costs, are based on management's best estimate of such costs
assuming a continuation of current economic and operating conditions. No
provision is included for depletion, depreciation and amortization of property
acquisition costs or indirect costs. The sales prices used in the calculation
are the year-end prices of crude oil, including condensate and natural gas
liquids, and natural gas which as of December 31, 1997, 1996 and 1995 were
$15.35, $23.48 and $18.53 per barrel of U.K. crude oil (Flotta) and $3.00,
$3.62, and $2.85 per Mcf (at the plant inlet) of Indonesian LNG, respectively.
Because of the estimated nature of the data presented, changes in price and cost
levels, as well as the timing of future development costs, may have a
significant impact on such data and cause such data not to be representative of
production or cash flows the Company may realize in the future.
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE.
 
     None
 
                                       66
<PAGE>   67
 
                                    PART III
 
     For the information called for by Items 10, 11 and 13, as well as
additional information for Item 12, reference is made to the Company's
definitive proxy statement for its 1998 Annual Meeting of Stockholders, which
will be filed with the Securities and Exchange Commission within 120 days after
December 31, 1997, and portions of which are incorporated herein by reference.
 
ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.
 
ITEM 11. EXECUTIVE COMPENSATION.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.
 
     In July 1985, two limited partnerships (the "KKR Partnerships"), which are
affiliated with Kohlberg Kravis Roberts & Co. ("KKR"), purchased approximately
50% of the then outstanding common stock of the Company from AlliedSignal Inc.
("Allied"). In September 1987, the Company sold 18,000,000 shares of its common
stock in concurrent public offerings in the United States and outside the United
States. In November 1992, Allied sold, in a secondary public offering, its
33,333,334 shares of common stock, which represented approximately 39% of the
Company's then issued and outstanding shares of common stock. In May 1995, the
KKR Partnerships sold, in a secondary public offering, 11,500,000 shares of
their 33,333,334 shares of common stock, which represented approximately 13% of
the Company's then issued and outstanding shares of common stock. Each of these
secondary offerings was registered by the Company under the Securities Act of
1933, as amended (the "Securities Act") pursuant to the Company's agreement with
the KKR Partnerships described below. The Company did not receive any proceeds
from the secondary public offerings.
 
     KKR Associates is a limited partnership of which Henry R. Kravis, George R.
Roberts, Michael W. Michelson, James H. Greene, Jr. and Edward A. Gilhuly,
directors of the Company, are five of the eleven general partners and Messrs.
Kravis and Roberts are also the members of the Executive Committee of KKR
Associates. KKR Associates is the sole general partner of each of the KKR
Partnerships, and possesses 100% of the voting power and investment power to the
shares owned by the KKR Partnerships. The KKR Partnerships are Petroleum
Associates, L.P. ("Petroleum Associates"), which owns of record approximately
25% of the Company's outstanding shares and KKR Partners II, L.P., which owns of
record less than 1% of the Company's shares. As a result, the KKR Partnerships
and their general partners may be able to exercise substantial influence over
the Company, through their representation with five of the twelve directors on
the Company's Board of Directors and by reason of their significant voting power
with respect to the election of directors and actions submitted to a vote of
stockholders.
 
     The limited partnership agreement pursuant to which Petroleum Associates
was organized expired on December 31, 1997 in accordance with the terms of the
limited partnership agreement. The terminated Petroleum Associates partnership
continues to be in existence for a winding-up period after such date. The
limited partnership agreement provides that, in connection with the dissolution
and winding up of Petroleum Associates, KKR Associates has the sole discretion
regarding the timing (which may be one or more years after the expiration of the
partnership agreement) and the manner of the disposition of the common stock of
the Company owned by Petroleum Associates, including public or private sales of
such common stock, the distribution of such common stock to the limited partners
of Petroleum Associates or a combination of the foregoing. If shares of the
Company's common stock are distributed to the limited partners of Petroleum
Associates, each limited partner will thereafter have sole discretion with
respect to its common stock. In addition, pursuant to the limited partnership
agreement, Petroleum Associates will distribute to KKR Associates for its own
account, concurrently with any sales of shares owned by Petroleum Associates,
cash and/or shares of common stock that together have a fair market value equal
to approximately 20% of the profits realized with respect to the shares sold and
distributed. The KKR Partnerships and certain transferees of their shares are,
under certain circumstances, exempt from the 15% threshold of an Acquiring
Person under the Company's Rights Agreement. See Item 5 -- Market for
Registrant's Common Equity and Related Stockholder Matters.
 
                                       67
<PAGE>   68
 
     The Company has agreed that, upon request of the KKR Partnerships, the
Company will register under the Securities Act and applicable state securities
laws the sale of the Company's common stock owned by the KKR Partnerships as to
which registration has been requested. The Company's obligation is subject to
certain limitations relating to a minimum amount required for registration, the
timing of a registration and other similar matters. The Company is obligated to
pay any registration expenses incidental to such registration, excluding
underwriters' commissions and discounts.
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.
 
(a)1 FINANCIAL STATEMENTS.
 
     The following financial statements and the Report of Independent
Accountants are filed as a part of this report on the pages indicated:
 
          Report of Independent Accountants -- page 38.
 
          Consolidated Balance Sheet -- December 31, 1997 and 1996 -- page 39.
 
          Consolidated Statement of Operations -- For the years ended December
     31, 1997, 1996 and 1995 -- page 40.
 
          Consolidated Statement of Cash Flows -- For the years ended December
     31, 1997, 1996 and 1995 -- page 41.
 
          Consolidated Statement of Stockholders' Equity -- For the years ended
     December 31, 1997, 1996 and 1995 -- page 42.
 
          Selected Quarterly Financial Data for the two years ended December 31,
     1997 -- page 58.
 
          Selected Financial Data for the five years ended December 31,
     1997 -- page 30.
 
(a)2 EXHIBITS.
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          3.1            -- Restated Certificate of Incorporation of Union Texas
                            Petroleum Holdings, Inc., as amended on May 10, 1995
                            (Filed under the identical exhibit number to the
                            Company's Form 8-K dated May 18, 1995 (Commission File
                            No. 1-9019) and incorporated herein by reference)
          3.2#           -- Bylaws of Union Texas Petroleum Holdings, Inc. as amended
                            December 19, 1997
          3.3            -- Specimen of Certificate evidencing the Common Stock with
                            Rights attached (Filed as Exhibit 3.2 of the Company's
                            Form 10-Q for quarter ended September 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
          4.1            -- Indenture for 8.25% Senior Notes due November 15, 1999,
                            dated as of November 15, 1992, between Union Texas
                            Petroleum Holdings, Inc., the Subsidiaries named therein
                            and State Street Bank and Trust Company (including form
                            of note) (Filed as Exhibit 10.1 to the Company's Form
                            10-Q for quarter ended March 31, 1994 (Commission File
                            No. 1-9019) and incorporated herein by reference)
</TABLE>
 
                                       68
<PAGE>   69
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          4.2            -- Indenture dated as of March 15, 1995, among Union Texas
                            Petroleum Holdings, Inc., the Subsidiaries named therein
                            and The First National Bank of Chicago, as trustee (the
                            "1995 Indenture") (Filed as Exhibit 10.1 to the Company's
                            Form 10-Q for quarter ended March 31, 1995 (Commission
                            File No. 1-9019) and incorporated herein by reference)
          4.3            -- Specimen Form of 8 3/8% Senior Note due March 15, 2005,
                            issued by Union Texas Petroleum Holdings, Inc. pursuant
                            to the 1995 Indenture (Filed as Exhibit 10.2 to the
                            Company's Form 10-Q for quarter ended March 31, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
          4.4            -- Specimen Form of 8 1/2% Senior Note due April 15, 2007,
                            issued by Union Texas Petroleum Holdings, Inc. pursuant
                            to the 1995 Indenture (Filed as Exhibit 10.3 to the
                            Company's Form 10-Q for quarter ended March 31, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
          4.5            -- Supplement dated November 7, 1995 to Indenture dated as
                            of November 15, 1992 for 8.25% Senior Notes due 1999,
                            between Union Texas Petroleum Holdings, Inc., the
                            Subsidiaries named therein and State Street Bank and
                            Trust Company (Filed as Exhibit 4.1 to the Company's Form
                            8-K dated November 17, 1995 (Commission File No. 1-9019)
                            and incorporated herein by reference)
          4.6            -- Supplement dated November 7, 1995 to the 1995 Indenture
                            between Union Texas Petroleum Holdings, Inc., the
                            Subsidiaries named therein and The First National Bank of
                            Chicago (Filed as Exhibit 4.2 to the Company's Form 8-K
                            dated November 17, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
          4.7            -- Form of Fixed Rate Medium-Term Note issued by the Company
                            pursuant to the 1995 Indenture (Filed as Exhibit 4.4 to
                            the Company's Registration Statement No. 33-64049 and
                            incorporated herein by reference). The Company agrees to
                            furnish to the Commission upon request a copy of each
                            instrument with respect to issues of such notes of the
                            Company, the authorized principal amount of which does
                            not exceed 10% of the consolidated assets of the Company
                            and its subsidiaries
          4.8            -- Rights Agreement dated as of September 12, 1997 between
                            the Company and First Chicago Trust Company of New York,
                            as Rights Agent, which includes as Exhibit A the Form of
                            Right Certificate and as Exhibit B the Summary of Rights
                            to Purchase Common Stock (Filed as Exhibit 1 to the
                            Company's Form 8-A Registration Statement filed September
                            15, 1997 (Commission File No. 1-9019) and as Exhibit 4.1
                            to the Company's 10-Q for quarter ended September 30,
                            1997 (Commission File No. 1-9019) and incorporated herein
                            by reference)
         10.1            -- Tax Agreement, dated as of June 27, 1985, among Allied
                            Corporation and Union Texas Petroleum Holdings, Inc.
                            (Filed as Exhibit 10.6 to the Company's Registration
                            Statement No. 33-00312 and incorporated herein by
                            reference)
         10.2+           -- Form of Subscription Agreement between Union Texas
                            Petroleum Holdings, Inc. and certain employees (Filed as
                            Exhibit 10.8 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.3+           -- Form of Tagalong Agreement between Union Texas Petroleum
                            Holdings, Inc. and certain employees (Filed as Exhibit
                            10.9 to the Company's Registration Statement No. 33-00312
                            and incorporated herein by reference)
         10.4+           -- Amended and Restated Union Texas Petroleum Salaried
                            Employees' Pension Plan, effective as of January 1, 1994
                            (Filed under the identical exhibit number to the
                            Company's 1993 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
</TABLE>
 
                                       69
<PAGE>   70
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.5+           -- Union Texas Petroleum Holdings, Inc. 1985 Stock Option
                            Plan, as amended (Filed as Exhibit 10.10 to Post
                            Effective Amendment No. 2 to the Company's Registration
                            Statement No. 33-12800 and incorporated herein by
                            reference)
         10.6+           -- Amended and Restated Union Texas Petroleum Savings Plan
                            for Salaried Employees, effective as of January 1, 1993
                            (Filed under the identical exhibit number to the
                            Company's 1993 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.7+           -- Amended and Restated Supplemental Non-Qualified Savings
                            Plan for Executive Employees of Union Texas Petroleum
                            Holdings, Inc. and its Subsidiaries, effective as of
                            January 1, 1993 (Filed under the identical exhibit number
                            to the Company's 1993 Form 10-K (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.8+           -- Form of employment letter with executive officers (Filed
                            as Exhibit 10.18 to the Company's Registration Statement
                            No. 33-00312 and incorporated herein by reference) and
                            Exhibit A (Filed as Exhibit 10.10 to the Company's 1992
                            Form 10-K (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.9            -- Joint Venture Agreement, dated as of August 8, 1968,
                            among Roy M. Huffington, Inc., Virginia International
                            Company, Austral Petroleum Gas Corporation, Golden Eagle
                            Indonesia Limited and Union Texas Far East Corporation,
                            as amended (the "Joint Venture Agreement") (Filed as
                            Exhibit 6.6 to the Registration Statement No. 2-58834 of
                            Alaska Interstate Company and incorporated herein by
                            reference)
         10.10           -- Supply Agreement, dated as of April 14, 1981, for Badak
                            LNG Expansion Project among Perusahaan Pertambangan
                            Minyak Dan Gas Bumi Negara ("Pertamina") and the parties
                            to the Joint Venture Agreement (Filed as Exhibit 10.14 to
                            the Company's 1992 Form 10-K (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.11           -- Indenture, dated as of September 25, 1984, between Unimar
                            Company, as Issuer, and Irving Trust Company, as Trustee,
                            providing for 14,077,747 Indonesian Participating Units
                            (Filed as Exhibit 4 to the Form S-14 Registration
                            Statement No. 2-93037 of Unimar Company and incorporated
                            herein by reference)
         10.12           -- Amended and Restated Agreement of General Partnership of
                            Unimar Company, dated as of September 11, 1990 (Filed as
                            Exhibit 3.1 to the Form 10-Q for quarter ended September
                            30, 1990 of Unimar Company (Commission File No. 1-8791)
                            and incorporated herein by reference)
         10.13           -- License No. P054 concerning all or part of the following
                            blocks in the United Kingdom North Sea: 49/15 and 49/25
                            (Sean Field) (Filed as Exhibit 10.74 to the Company's
                            Registration Statement No. 33-00312 and incorporated
                            herein by reference)
         10.14           -- License No. P220 concerning all or part of the following
                            blocks in the United Kingdom North Sea: 9/26, 14/19,
                            15/11, 15/15, 15/17 and 210/29 (Piper Field) (Filed as
                            Exhibit 10.75 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.15           -- License No. P249 concerning part of the following block
                            in the United Kingdom North Sea: 14/19 (Claymore Field)
                            (Filed as Exhibit 10.76 to the Company's Registration
                            Statement No. 33-00312 and incorporated herein by
                            reference)
         10.16           -- License No. P250 concerning all or part of the following
                            blocks in the United Kingdom North Sea: 9/26, 15/11,
                            15/15, 210/29, 15/17 and 14/19 (Scapa Field) (Filed as
                            Exhibit 10.77 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
</TABLE>
 
                                       70
<PAGE>   71
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.17           -- Restated United Kingdom Continental Shelf Operating
                            Agreement (Piper License), dated as of August 11, 1977,
                            among Occidental Petroleum (U.K.) Limited, Occidental of
                            Britain, Inc., Getty Oil (Britain) Limited, Allied
                            Chemical (Great Britain) Limited, Allied Chemical (North
                            Sea) Ltd., Thomson North Sea Limited and the British
                            National Oil Corporation (Filed as Exhibit No. 10.78 to
                            the Company's Registration Statement No. 33-00312 and
                            incorporated herein by reference)
         10.18           -- Restated United Kingdom Continental Shelf Operating
                            Agreement (Claymore License), dated August 11, 1977,
                            among Occidental Petroleum (Caledonia) Limited,
                            Occidental of Scotland, Inc., Getty Oil (Britain)
                            Limited, Allied Chemical (Great Britain) Limited, Allied
                            Chemical (North Sea) Ltd., Thomson North Sea Limited and
                            the British National Oil Corporation (Filed as Exhibit
                            10.79 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.19           -- United Kingdom Continental Shelf Joint Operating
                            Agreement for Blocks 49/15a and 49/25a (Sean Field),
                            dated July 3, 1984, among Shell U.K. Limited, Union Texas
                            Petroleum Limited, Britoil Public Limited Company and
                            Esso Exploration and Production U.K. Limited (Filed as
                            Exhibit 10.81 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.20           -- Agreement for Sale and Purchase of Natural Gas from the
                            Sean North and Sean South Fields, dated November 7, 1984,
                            between Union Texas Petroleum Limited and British Gas
                            Corporation, including list of omitted schedules (Filed
                            as Exhibit 10.82 to the Company's Registration Statement
                            No. 33-00312 and incorporated herein by reference)
         10.21           -- Badak III LNG Sales Contract, dated March 19, 1987,
                            between Pertamina, as Seller, and Chinese Petroleum
                            Corporation, as Buyer (Filed as Exhibit 10.28 to the
                            Company's 1992 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.22           -- Supplemental Indenture, dated as of October 31, 1986, to
                            the Indenture between Unimar Company and Irving Trust
                            Company (Exhibit 10.13 above) (Filed as Exhibit 10.114 to
                            the Company's Registration Statement No. 33-16267 and
                            incorporated herein by reference)
         10.23           -- Amended and Restated Registration Rights Agreement, dated
                            September 30, 1987, among Union Texas Petroleum Holdings,
                            Inc. and Certain Holders of Certain Securities of Union
                            Texas Petroleum Holdings, Inc. (Filed as Exhibit 10.117
                            to Post Effective Amendment No. 1 to the Company's
                            Registration Statement No. 33-12800 and incorporated
                            herein by reference)
         10.24+          -- Union Texas Petroleum Holdings, Inc. 1987 Stock Option
                            Plan and First Amendment to Union Texas Petroleum
                            Holdings, Inc. 1987 Stock Option Plan (Filed as Exhibit
                            4.4 to the Company's Registration Statement No. 33-21684
                            and incorporated herein by reference)
         10.25           -- Badak III LNG Sales Contract Supply Agreement, dated
                            October 19, 1987, among Pertamina and the parties to the
                            Joint Venture Agreement (Filed as Exhibit 10.132 to Post
                            Effective Amendment No. 1 to the Company's Registration
                            Statement No. 33-12800 and incorporated herein by
                            reference)
</TABLE>
 
                                       71
<PAGE>   72
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.26           -- $316,000,000 Bontang III Loan Agreement, dated February
                            9, 1988, among the Trustee under the Bontang III Trustee
                            and Paying Agent Agreement, Train-E Finance Co., Ltd., as
                            Tranche A Lender and The Industrial Bank of Japan Trust
                            Company as Agent for the Tranche B Lenders and as Tranche
                            B Lender (Filed as Exhibit 10.83 to Post Effective
                            Amendment No. 2 to the Company's Registration Statement
                            No. 33-12800 and incorporated herein by reference)
         10.27           -- Bontang III Producers Agreement, dated as of February 9,
                            1988, among Pertamina, Roy M. Huffington, Inc.,
                            Huffington Corporation, VICO, Virginia International
                            Company, Ultramar Indonesia Company Limited, Union Texas
                            East Kalimantan Limited, Universe Tankships, Inc., Total
                            Indonesie, Unocal Indonesia, Ltd., Indonesia Petroleum,
                            Ltd., in favor of Train-E Finance Co., Ltd., as Tranche A
                            Lender, The Industrial Bank of Japan Trust Company as
                            Agent for the Tranche B Lenders and as Tranche B Lender,
                            and the other Tranche B Lenders named therein (Filed as
                            Exhibit 10.84 to the Post Effective Amendment No. 2 to
                            the Company's Registration Statement No. 33-12800 and
                            incorporated herein by reference)
         10.28           -- Bontang III Trustee and Paying Agent Agreement, dated
                            February 9, 1988, among Pertamina, Roy M. Huffington,
                            Inc., Huffington Corporation, Virginia International
                            Company, VICO, Ultramar Indonesia Limited, Union Texas
                            East Kalimantan Limited, Universe Tankships, Inc., Total
                            Indonesie, Unocal Indonesia, Ltd., Indonesia Petroleum,
                            Ltd. and the Trustee thereunder (Filed as Exhibit 10.42
                            to the Company's 1991 Form 10-K (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.29+          -- Third Amendment to Union Texas Petroleum Holdings, Inc.
                            1985 Stock Option Plan (Filed as Exhibit 10.95 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.30+          -- Second Amendment to Union Texas Petroleum Holdings, Inc.
                            1987 Stock Option Plan (Filed as Exhibit 10.96 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.31+          -- Union Texas Petroleum Supplemental Retirement Plan (Filed
                            as Exhibit 10.99 to the Company's Form 10-Q for quarter
                            ended June 30, 1990 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.32+          -- Amended and Restated Union Texas Petroleum Supplemental
                            Retirement Plan II, effective January 1, 1994 (Filed as
                            Exhibit 10.41 to the Company's 1993 Form 10-K (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.33+          -- Union Texas Petroleum Supplemental Retirement Plans
                            Trust, as amended (Filed as Exhibit 10.101 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.34           -- Amended and Restated Production Sharing Contract
                            effective August 8, 1968-August 7, 1998 among Pertamina,
                            Roy M. Huffington, Inc., VICO, Virginia International
                            Company, Ultramar Indonesia Limited, Union Texas East
                            Kalimantan Limited, Universe Gas & Oil Company, Inc. and
                            Huffington Corporation (Filed as Exhibit 10.102 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
</TABLE>
 
                                       72
<PAGE>   73
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.35           -- Production Sharing Contract effective August 8,
                            1998-August 7, 2018 among Pertamina, Roy M. Huffington,
                            Inc., VICO, Virginia International Company, Ultramar
                            Indonesia Limited, Union Texas East Kalimantan Limited,
                            Universe Gas & Oil Company, Inc. and Huffington
                            Corporation (Filed as Exhibit 10.103 to the Company's
                            Form 10-Q for quarter ended June 30, 1990 (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.36           -- Joint Operating Agreement for the Scapa Field, dated
                            December 23, 1985, among Occidental Petroleum (Caledonia)
                            Limited, Texaco Britain Limited, Union Texas Petroleum
                            Limited, Thomson North Sea Limited, Thomson Scottish
                            Petroleum Limited and the Oil and Pipelines Agency (Filed
                            as Exhibit 10.104 to the Company's Form 10-Q for quarter
                            ended June 30, 1990 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.37           -- Amended and Restated 1973 LNG Sales Contract, dated as of
                            the 1st day of January, 1990, by and between Pertamina,
                            as Seller, and Chubu Electric Power Co., Inc., The Kansai
                            Electric Power Co., Inc., Kyushu Electric Power Co.,
                            Inc., Nippon Steel Corporation, Osaka Gas Co., Ltd. and
                            Toho Gas Co., Ltd., as Buyers (Filed as Exhibit (10)-8 to
                            the 1993 Form 10-K of Unimar Company (Commission File No.
                            1-8791) and incorporated herein by reference)
         10.38           -- Amended and Restated Bontang Processing Agreement, dated
                            February 9, 1988, among Pertamina and Roy M. Huffington,
                            Inc., Huffington Corporation, VICO, Virginia
                            International Company, Ultramar Indonesia Limited, Union
                            Texas East Kalimantan Limited, Universe Tankships, Inc.,
                            Total Indonesie, Unocal Indonesia, Ltd., Indonesia
                            Petroleum, Ltd. and P.T. Badak Natural Gas Liquefaction
                            Company (Filed as Exhibit (10)-39 to the 1988 Form 10-K
                            of Unimar Company (Commission File No. 1-8791) and
                            incorporated herein by reference)
         10.39           -- Amended and Restated Debt Service Allocation Agreement,
                            dated February 9, 1988, among Pertamina and Roy M.
                            Huffington, Inc., VICO, Ultramar Indonesia Limited,
                            Virginia International Company, Union Texas East
                            Kalimantan Limited, Universe Tankships, Inc., Huffington
                            Corporation, Total Indonesie, Unocal Indonesia, Ltd. and
                            Indonesia Petroleum, Ltd. (Filed as Exhibit (10)-40 to
                            the 1988 Form 10-K of Unimar Company (Commission File No.
                            1-8791) and incorporated herein by reference)
         10.40           -- Amendment No. 1 to Bontang III Producers Agreement, dated
                            as of May 31, 1988, among Pertamina, Roy M. Huffington,
                            Inc., Huffington Corporation, VICO, Virginia
                            International Company, Ultramar Indonesia Limited, Union
                            Texas East Kalimantan Limited, Universe Tankships, Inc.,
                            Total Indonesie, Unocal Indonesia, Ltd., Indonesia
                            Petroleum, Ltd. and Train-E Finance Co., Ltd., as Tranche
                            A Lender, and The Industrial Bank of Japan Trust Company
                            on behalf of the Tranche B Lender, (Filed as Exhibit
                            (10)-21 to the 1993 Form 10-K of Unimar Company
                            (Commission File No. 1-8791) and incorporated herein by
                            reference)
         10.41           -- Badak IV LNG Sales Contract, dated October 23, 1990,
                            between Pertamina, as Seller, and Osaka Gas Co., Ltd.,
                            Tokyo Gas Co., Ltd. and Toho Gas Co., Ltd., as Buyer
                            (Filed as Exhibit (10)-65 to the 1990 Form 10-K of Unimar
                            Company (Commission File No. 1-8791) and incorporated
                            herein by reference)
         10.42           -- Supply Agreement for Natural Gas to Badak IV LNG Sales
                            Contract, dated August 12, 1991, by and between
                            Pertamina, VICO, Opicoil Houston, Inc., Ultramar
                            Indonesia Limited, Union Texas East Kalimantan Limited,
                            Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.80 to the
                            Company's 1991 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
</TABLE>
 
                                       73
<PAGE>   74
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.43           -- LNG Sales and Purchase Contract (Korea II), dated May 7,
                            1991, between Pertamina, as Seller, and Korea Gas
                            Corporation, as Buyer (Filed as Exhibit (10)-1 to the
                            1990 Form 10-Q for quarter ended June 30, 1991 of Unimar
                            Company (Commission File No. 1-8791) and incorporated
                            herein by reference)
         10.44           -- $750,000,000 Bontang IV Loan Agreement, dated as of
                            August 26, 1991, among the Trustee under the Bontang IV
                            Trustee and Paying Agent Agreement as Borrower, Chase
                            Manhattan Asia Limited and The Mitsubishi Bank, Limited
                            as Coordinators, the other banks and financial
                            institutions named therein as Arrangers, Co-Arrangers,
                            Lead Managers, Managers, Co-Managers and Lenders, The
                            Chase Manhattan Bank, N.A. and The Mitsubishi Bank,
                            Limited as Co-Agents and The Chase Manhattan Bank, N.A.
                            as Agent (Filed as Exhibit 10.1 to the Form 10-Q for
                            quarter ended September 30, 1991 of Unimar Company
                            (Commission File No. 1-8791) and incorporated herein by
                            reference)
         10.45           -- Bontang IV Producers Agreement, dated as of August 26,
                            1991, by Pertamina, Virginia International Company,
                            Opicoil Houston, Inc., VICO, Ultramar Indonesia Limited,
                            Union Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc., Total Indonesie, Unocal Indonesia, Ltd.
                            and Indonesia Petroleum, Ltd. in favor of The Chase
                            Manhattan Bank, N.A., as Agent for the Lenders and as
                            Lender, and the other Lenders named therein (Filed as
                            Exhibit 10.2 to the Form 10-Q for quarter ended September
                            30, 1991 of Unimar Company (Commission File No. 1-8791)
                            and incorporated herein by reference)
         10.46           -- Bontang IV Trustee and Paying Agent Agreement, dated as
                            of August 26, 1991, among Pertamina, Virginia
                            International Company, Opicoil Houston, Inc., VICO,
                            Ultramar Indonesia Limited, Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc., Total
                            Indonesie, Unocal Indonesia, Ltd., Indonesia Petroleum,
                            Ltd. and the Trustee thereunder (Filed as Exhibit 10.3 to
                            the Form 10-Q for quarter ended September 30, 1991 of
                            Unimar Company (Commission File No. 1-8791) and
                            incorporated herein by reference)
         10.47           -- Consulting Agreement, dated as of November 18, 1992,
                            among Petroleum Associates, L.P., KKR Partners II, L.P.
                            and Union Texas Petroleum Holdings, Inc. (Filed as
                            Exhibit 10.81 to the Company's 1992 Form 10-K (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.48+          -- Second Amendment to Union Texas Petroleum Supplemental
                            Retirement Plans Trust (Filed as Exhibit 10.82 to the
                            Company's 1992 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.49           -- Amendment No. 1 to Bontang III Trustee and Paying Agent
                            Agreement, dated as of December 11, 1992, among
                            Pertamina, VICO, Virginia International Company, Ultramar
                            Indonesia Limited, Union Texas East Kalimantan Limited,
                            Opicoil Houston, Inc., Universe Gas & Oil Company, Inc.,
                            Total Indonesie, Unocal Indonesia Ltd., Indonesia
                            Petroleum, Ltd. and the Bontang III Trustee (Filed as
                            Exhibit 10.83 to the Company's 1992 Form 10-K (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.50+          -- First Amendment to Union Texas Petroleum Supplemental
                            Retirement Plan (Filed as Exhibit 10.85 to the Company's
                            1992 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.51+          -- Union Texas Petroleum Holdings, Inc. 1992 Stock Option
                            Plan (Filed as Exhibit 4.3 to the Company's Registration
                            Statement No. 33-64928 and incorporated herein by
                            reference)
</TABLE>
 
                                       74
<PAGE>   75
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.52           -- Arun and Bontang LPG Sales and Purchase Contract, dated
                            July 15, 1986, between Pertamina, as Seller, and
                            Mitsubishi Corporation, Cosmo Oil Co., Ltd., Nippon
                            Petroleum Gas Co., Ltd., Showa Shell Sekiyu K.K., Kyodo
                            Oil Co., Ltd., Idemitsu Kosan Co., Ltd. and Mitsui
                            Liquefied Gas Co., Ltd., as Buyers (Filed as Exhibit
                            (10)-60 to the 1991 Form 10-K of Unimar Company
                            (Commission File No. 1-8791) and incorporated herein by
                            reference)
         10.53           -- Petroleum Concession Agreement, dated January 21, 1992,
                            between the President of the Islamic Republic of Pakistan
                            and Union Texas Pakistan, Inc., Occidental Petroleum
                            (Pakistan) Inc. and Oil & Gas Development Corporation
                            (Filed as Exhibit 10.87 to the Company's Form 10-Q for
                            quarter ended March 31, 1992 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.54           -- Amended and Restated Supply Agreement (In support of the
                            Amended and Restated 1973 LNG Sales Contract), dated
                            September 22, 1993, and effective December 3, 1973,
                            between Pertamina and VICO, LASMO Sanga Sanga Limited,
                            Opicoil Houston, Inc., Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.75 to the
                            Company's 1993 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.55           -- Share Sale Agreement, dated October 18, 1994, among Union
                            Texas Petroleum Limited, Fina Petroleum Development
                            Limited and Fina Exploration Limited (the "Share Sale
                            Agreement") (Filed as Exhibit 2.1 to the Company's Form
                            8-K dated November 14, 1994 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.56           -- Guarantee, dated October 18, 1994, by Union Texas
                            International Corporation relating to the Share Sale
                            Agreement (Filed as Exhibit 2.3 to the Company's Form 8-K
                            dated November 14, 1994 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.57           -- Petroleum Concession Agreement, dated April 20, 1977,
                            between the President of Pakistan and Union Texas
                            Pakistan, Inc. (Filed as Exhibit 10.87 to the Company's
                            1994 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.58           -- Amendments to Arun and Bontang LPG Sales and Purchase
                            Contract, dated October 5, 1994, between Pertamina, as
                            Seller, and Mitsubishi Corporation, Cosmo Oil Co., Ltd.,
                            Nippon Petroleum Gas Co., Ltd., Showa Shell Sekiyu K.K.,
                            Japan Energy Corporation, Idemitsu Kosan Co., Ltd. and
                            Mitsui Oil & Gas Co., Ltd., as Buyers (Filed as Exhibit
                            10.88 to the Company's 1994 Form 10-K (Commission File
                            No. 1-9019) and incorporated herein by reference)
         10.59           -- Amendment to the Amended and Restated 1973 LNG Sales
                            Contract, dated as of the 1st day of June 1992, by and
                            between Pertamina, as Seller, and Kyushu Electric Power
                            Co., Inc., Nippon Steel Corporation and Toho Gas Co.,
                            Ltd., as Buyers (Filed as Exhibit (10)-9 to the 1993 Form
                            10-K of Unimar Company (Commission File No. 1-8791) and
                            incorporated herein by reference)
         10.60           -- Facility Agreement, dated May 26, 1995, among Union Texas
                            Britannia Limited, Chemical Bank, as Arranger,
                            NationsBank, N.A. Carolinas, as Facility Agent, National
                            Westminster Bank plc, as Funding Agent, and the
                            Co-Arrangers, Technical Agents, Account Bank and Banks
                            named therein (Filed as Exhibit 10.9 to the Company's
                            Form 10-Q for quarter ended June 30, 1995 (Commission
                            File No. 1-9019) and incorporated herein by reference)
</TABLE>
 
                                       75
<PAGE>   76
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.61           -- Sponsor Direct Agreement, dated May 26, 1995, among Union
                            Texas Petroleum Limited, Union Texas Britannia Limited
                            and NationsBank N.A. Carolinas, as Facility Agent (Filed
                            as Exhibit 10.10 to the Company's Form 10-Q for quarter
                            ended June 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.62           -- Sponsor Support Agreement, dated May 26, 1995, between
                            Union Texas Petroleum Limited and Union Texas Britannia
                            Limited (Filed as Exhibit 10.11 to the Company's Form
                            10-Q for quarter ended June 30, 1995 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.63+          -- Union Texas Petroleum Holdings, Inc. 1994 Incentive Plan
                            (Filed as Exhibit 10.12 to the Company's Form 10-Q for
                            quarter ended June 30, 1995 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.64+          -- First Amendment to Union Texas Petroleum Holdings, Inc.
                            1992 Stock Option Plan (Filed as Exhibit 10.13 to the
                            Company's Form 10-Q for quarter ended June 30, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.65           -- Sale and Purchase Agreement dated May 31, 1995, between
                            Union Texas Petroleum Limited and Oryx U.K. Energy
                            Company (Filed as Exhibit 10.14 to the Company's Form
                            10-Q for quarter ended June 30, 1995 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.66           -- Bontang V Loan Agreement, dated as of July 1, 1995, among
                            BankAmerica International, as Trustee under the Bontang V
                            Trustee and Paying Agent Agreement, as Borrower, Bontang
                            Train-G Project Finance Co., Ltd. ("Tranche A Lender"),
                            the Banks named therein as Tranche B Lenders, The
                            Long-Term Credit Bank of Japan, Limited, New York Branch
                            ("Facility Agent"), The Fuji Bank, Limited
                            ("Intercreditor Agent"), Credit Lyonnais ("Technical
                            Agent"), and Credit Lyonnais, The Fuji Bank, Limited and
                            The Long-Term Credit Bank of Japan, Limited
                            (collectively, the "Arrangers") (Filed as Exhibit 10.1 to
                            the Company's Form 10-Q for quarter ended September 30,
                            1995 (Commission File No. 1-9019) and incorporated herein
                            by reference)
         10.67           -- Bontang V Producers Agreement, dated as of July 1, 1995,
                            by Pertamina, VICO, OPICOIL Houston, Inc., Virginia
                            International Company, LASMO Sanga Sanga Limited, Union
                            Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc., Total Indonesie, Unocal Indonesia Company
                            and Indonesia Petroleum, Ltd. (collectively, the
                            "Producers"), in favor of the Tranche A Lender, the Banks
                            named therein as Tranche B Lenders and the Facility
                            Agent, Intercreditor Agent and Technical Agent (Filed as
                            Exhibit 10.2 to the Company's Form 10-Q for quarter ended
                            September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.68           -- Bontang V Trustee and Paying Agent Agreement, dated as of
                            July 1, 1995, among the Producers and BankAmerica
                            International, as Trustee and Paying Agent (Filed as
                            Exhibit 10.3 to the Company's Form 10-Q for quarter ended
                            September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.69           -- Amendment No. 1 to Bontang III Loan Agreement, dated as
                            of July 1, 1995, among Continental Bank International, as
                            Trustee under the Bontang III Trustee and Paying Agent
                            Agreement, Train-E Finance Co., Ltd., as Tranche A
                            Lender, and The Industrial Bank of Japan Trust Company,
                            as Agent on behalf of the Majority Tranche B Lenders
                            (Filed as Exhibit 10.6 to the Company's Form 10-Q for
                            quarter ended September 30, 1995 (Commission File No.
                            1-9019) and incorporated herein by reference)
</TABLE>
 
                                       76
<PAGE>   77
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.70           -- Second Amended and Restated 1973 LNG Sales Contract,
                            dated as of August 3, 1995, between Pertamina, as Seller,
                            and Chubu Electric Power Co., Inc., The Kansai Electric
                            Power Co., Inc., Kyushu Electric Power Co., Inc., Nippon
                            Steel Corporation, Osaka Gas Co., Ltd. and Toho Gas Co.,
                            Ltd., as the Buyers, with related letter agreement, dated
                            August 3, 1995, between Seller and Buyers (Filed as
                            Exhibit 10.7 to the Company's Form 10-Q for quarter ended
                            September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.71           -- Package V Supply Agreement for Natural Gas in Support of
                            the 1973 LNG Sales Contract Extension, dated June 16,
                            1995, effective October 6, 1994, between Pertamina and
                            VICO, LASMO Sanga Sanga Limited, OPICOIL Houston, Inc.,
                            Union Texas East Kalimantan Limited, Universe Gas and Oil
                            Company, Inc. and Virginia International Company (Filed
                            as Exhibit 10.8 to the Company's Form 10-Q for quarter
                            ended September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.72+          -- First Amendment to Union Texas Petroleum Savings Plan for
                            Salaried Employees (Filed as Exhibit 10.9 to the
                            Company's Form 10-Q for quarter ended September 30, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.73+          -- Second Amendment to Union Texas Petroleum Savings Plan
                            for Salaried Employees (Filed as Exhibit 10.103 to the
                            Company's 1995 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.74           -- Second Amended and Restated 1981 Badak LNG Sales
                            Contract, dated as of August 3, 1995, between Pertamina,
                            as Seller, and Chubu Electric Power Co., Inc., The Kansai
                            Electric Power Co., Inc., Osaka Gas Co., Ltd. and Toho
                            Gas Co., Ltd., as Buyers, with related letter agreement,
                            dated August 3, 1995, between Seller and Buyers (Filed as
                            Exhibit 10.104 to the Company's 1995 Form 10-K
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.75           -- LNG Sales and Purchase Contract (Badak V), dated August
                            12, 1995, between Pertamina and Korea Gas Corporation
                            (Filed as Exhibit 10.105 to the Company's 1995 Form 10-K
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.76           -- LNG Sale and Purchase Contract (Badak VI), dated October
                            25, 1995, between Pertamina and Chinese Petroleum
                            Corporation (Filed as Exhibit 10.106 to the Company's
                            1995 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.77           -- Badin-II Revised Petroleum Concession Agreement, dated
                            January 22, 1995 between the President of the Islamic
                            Republic of Pakistan and Union Texas Pakistan, Inc.,
                            Occidental Petroleum (Pakistan), Inc., Oil and Gas
                            Development Corporation and the Federal Government of the
                            Islamic Republic of Pakistan (Filed as Exhibit 10.107 to
                            the Company's 1995 Form 10-K (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.78+          -- Third Amendment to Union Texas Petroleum Savings Plan for
                            Salaried Employees (Filed as Exhibit 10.1 to the
                            Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
</TABLE>
 
                                       77
<PAGE>   78
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.79           -- First Supply Agreement for Package V Excess Sales
                            (1998-1999 LNG Sales to Korea Gas Corporation under Badak
                            V), dated as of May 1, 1996, between Pertamina and
                            Virginia Indonesia Company, Lasmo Sanga Sanga Limited,
                            Opicoil Houston, Inc., Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.2 to the
                            Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.80           -- Package VI Supply Agreement for Natural Gas in Support of
                            2000-2017 LNG Sales to Korea Gas Corporation under Badak
                            V, dated as of May 1, 1996, between Pertamina and
                            Virginia Indonesia Company, Lasmo Sanga Sanga Limited,
                            Opicoil Houston, Inc., Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.4 to the
                            Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.81           -- Package VI Supply Agreement for Natural Gas in Support of
                            2000-2017 LNG Sales to Chinese Petroleum Corporation
                            under Badak VI, dated as of May 1, 1996, between
                            Pertamina and Virginia Indonesia Company, Lasmo Sanga
                            Sanga Limited, Opicoil Houston, Inc., Union Texas East
                            Kalimantan Limited, Universe Gas & Oil Company, Inc. and
                            Virginia International Company (Filed as Exhibit 10.5 to
                            the Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.82           -- First Supply Agreement for Package VI Excess Sales
                            (2003-2008 LNG Sales under the Second Amended and
                            Restated 1981 Badak Sales Contract), dated as of May 1,
                            1996, between Pertamina and Virginia Indonesia Company,
                            Lasmo Sanga Sanga Limited, Opicoil Houston, Inc., Union
                            Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc. and Virginia International Company (Filed
                            as Exhibit 10.6 to the Company's Form 10-Q for quarter
                            ended June 30, 1996 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.83+          -- First Amendment to Supplemental Non-Qualified Savings
                            Plan for Executive Employees (Filed as Exhibit 10.1 to
                            the Company's Form 10-Q for quarter ended September 30,
                            1996 (Commission File No. 1-9019) and incorporated herein
                            by reference)
         10.84+          -- Second Amendment to the Salaried Employees' Pension Plan
                            (Filed as Exhibit 10.2 to the Company's Form 10-Q for
                            quarter ended September 30, 1996 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.85           -- License No. P213 and Deed of License Assignment covering
                            United Kingdom North Sea Blocks 16/26 (Britannia and Alba
                            Fields) and 28/5a (Filed as Exhibit 10.105 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.86+          -- First Amendment to Union Texas Petroleum Holdings, Inc.
                            1994 Incentive Plan (Filed as Exhibit 10.107 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.87+          -- Second Amendment to Union Texas Petroleum Holdings, Inc.
                            1992 Stock Option Plan (Filed as Exhibit 10.108 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.88+          -- Third Amendment to Union Texas Petroleum Holdings, Inc.
                            1987 Stock Option Plan (Filed as Exhibit 10.109 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
</TABLE>
 
                                       78
<PAGE>   79
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.89+          -- Fourth Amendment to Union Texas Petroleum Holdings, Inc.
                            1985 Stock Option Plan (filed as Exhibit 10.110 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.90+          -- First Amendment to Union Texas Petroleum Supplemental
                            Retirement Plan II (filed as Exhibit 10.111 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.91           -- Second Amended and Restated Credit Agreement dated as of
                            March 29, 1996 among Union Texas Petroleum Holdings,
                            Inc., the Banks and Co-Agents listed therein and
                            NationsBank of Texas, N.A., as Agent (Filed as Exhibit
                            10.1 to the Company's Form 10-Q for quarter ended March
                            31, 1996 (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.92           -- First Amendment Agreement dated as of March 11, 1997 to
                            the Second Amended and Restated Credit Agreement dated as
                            of March 29, 1996, among Union Texas Petroleum Holdings,
                            Inc., the Banks and Co-Agents listed therein and
                            NationsBank of Texas, N.A., as Agent (Filed as Exhibit
                            10.1 to the Company's Form 10-Q for quarter ended March
                            31, 1997 (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.93           -- Credit Agreement dated as of March 11, 1997 among Union
                            Texas Petroleum Holdings, Inc., the Banks and Co-Agents
                            listed therein and NationsBank of Texas, N.A., as Agent
                            (Filed as Exhibit 10.2 to the Company's Form 10-Q for
                            quarter ended March 31, 1997 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.94           -- $1,127,000,000 Bontang VI Loan Agreement, dated as of
                            March 4, 1997, among Bank of America National Trust and
                            Savings Association, as Trustee under the Bontang VI
                            Trustee and Paying Agent Agreement, as Borrower, Bank of
                            Taiwan New York Agency as Lead Arranger, Bontang LNG
                            Train-H Investment Co., Ltd. as Co-Lead Arranger, The
                            Chase Manhattan Bank as Agent, Co-Agent and Co-Arranger,
                            and the Co-Agents, Co-Arrangers and Lenders named therein
                            (Filed as Exhibit 10.3 to the Company's Form 10-Q for
                            quarter ended March 31, 1997 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.95           -- Bontang VI Producers Agreement, dated as of March 4,
                            1997, by Pertamina, Total Indonesie, VICO, Union Texas
                            East Kalimantan Limited, Lasmo Sanga Sanga Limited,
                            Virginia International Company, Opicoil Houston, Inc.,
                            Universe Gas & Oil Company, Inc., Indonesia Petroleum,
                            Ltd., Unocal Indonesia Company (collectively, the
                            "Producers"), in favor of Bank of Taiwan New York Agency,
                            as Lead Arranger, Bontang LNG Train-H Investment Co.,
                            Ltd. as Co-Lead Arranger, The Chase Manhattan Bank as
                            Agent, Co-Agent and Co-Arranger, and the Co-Agents,
                            Co-Arrangers and Lenders named therein (Filed as Exhibit
                            10.4 to the Company's Form 10-Q for quarter ended March
                            31, 1997 (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.96           -- Bontang VI Trustee and Paying Agent Agreement, dated as
                            of March 4, 1997, among the Producers and Bank of America
                            National Trust and Savings Association, as Trustee and
                            Paying Agent (Filed as Exhibit 10.5 to the Company's Form
                            10-Q for quarter ended March 31, 1997 (Commission File
                            No. 1-9019) and incorporated herein by reference)
         10.97           -- Letter Agreement Amendment to Facility Agreement dated
                            May 26, 1995 between Union Texas Britannia Limited as
                            Borrower and The Chase Manhattan Bank as Arranger,
                            NationsBank, N.A. as Facility Agent and the Technical
                            Agents, Funding Agent, Account Bank and the other
                            financial institutions named therein (Filed as Exhibit
                            10.6 to the Company's Form 10-Q for quarter ended March
                            31, 1997 (Commission File No. 1-9019) and incorporated
                            herein by reference)
</TABLE>
 
                                       79
<PAGE>   80
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.98           -- Amendment No. 2 to Bontang III Loan Agreement, dated as
                            of March 4, 1997 among BankAmerica International, as
                            Trustee under the Bontang III Trustee and Paying Agent
                            Agreement, Train-E Finance Co., Ltd. as Tranche A Lender
                            and The Industrial Bank of Japan Trust Company, as agent
                            on behalf of the Majority Tranche B Lenders (Filed as
                            Exhibit 10.7 to the Company's Form 10-Q for quarter ended
                            March 31, 1997 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.99           -- Second Amendment to the Union Texas Petroleum Holdings,
                            Inc. 1994 Incentive Plan (Filed as Exhibit 10.2 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.100          -- Third Amendment to Union Texas Petroleum Holdings, Inc.
                            1992 Stock Option Plan (Filed as Exhibit 10.3 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.101          -- Fourth Amendment to Union Texas Petroleum Holdings, Inc.
                            1987 Stock Option Plan (Filed as Exhibit 10.4 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.102          -- Fifth Amendment to Union Texas Petroleum Holdings, Inc.
                            1986 Stock Option Plan (Filed as Exhibit 10.5 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.103          -- Third Amendment to Union Texas Petroleum Salaried
                            Employees' Pension Plan (Filed as Exhibit 10.1 to the
                            Company's Form 10-Q for quarter ended September 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.104          -- Stock Purchase Agreement dated as of January 27, 1998
                            between Occidental Oil and Gas Corporation, Union Texas
                            Venezuela Limited and Union Texas International
                            Corporation (Filed as Exhibit 2.1 to the Company's Form
                            8-K filed February 13, 1998 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.105+#        -- Conformed Union Texas Petroleum Holdings, Inc. Executive
                            Severance Plan
         10.106#         -- Boqueron Operating Agreement dated July 29, 1997 between
                            Lagoven, S.A. and Union Texas Venezuela Limited and
                            Preussag Energie GmbH (portions have been omitted
                            pursuant to a request for confidential treatment under
                            the Securities Exchange Act of 1934)
         10.107#         -- DZO Operating Services Agreement dated November 19, 1993
                            between Compania Occidental de Hidrocarburos, Inc. and
                            Maraven, S.A., as amended by Addendum No. 1 dated
                            December 7, 1994 (portions have been omitted pursuant to
                            a request for confidential treatment under the Securities
                            Exchange Act of 1934)
         10.108#         -- Loan Agreement dated February 4, 1998 between Compania
                            Occidental de Hidrocarburos, Inc., as Borrower and
                            NationsBank of Texas, N.A. with Promissory Note attached
                            as Exhibit A and Guaranty Agreement dated as of February
                            4, 1998 between Union Texas Petroleum Holdings, Inc., as
                            Guarantor, and NationsBank of Texas, N.A., as Lender,
                            attached as Exhibit B
         10.109+#        -- Fourth Amendment to Union Texas Petroleum Salaried
                            Employees' Pension Plan
         10.110+#        -- Fourth Amendment to Union Texas Petroleum Savings Plan
                            for Salaried Employees
         10.111+#        -- Amended and Restated Union Texas Petroleum Deferred
                            Compensation Plan
</TABLE>
 
                                       80
<PAGE>   81
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.112#         -- Addendum to Badak IV LNG Sales Contract Supply Agreement,
                            dated January 31, 1994, but effective as of October 23,
                            1990, by and between Pertamina, on the one hand, and
                            VICO, LASMO Sanga Sanga Limited, Opicoil Houston, Inc.,
                            Union Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc. and Virginia International Company
         10.113#         -- Memorandum of Agreement, dated September 30, 1994 by and
                            between Pertamina and Korea Gas Corporation
         10.114#         -- Package V Supply Agreement (1995-1999 LNG Sales to Korea
                            Gas Corporation), dated June 16, 1995, but effective as
                            of September 30, 1994, between Pertamina and VICO, LASMO
                            Sanga Sanga Limited, Opicoil Houston, Inc., Union Texas
                            East Kalimantan Limited, Universe Gas & Oil Company, Inc.
                            and Virginia International Company
         10.115#         -- Memorandum of Agreement, effective as of December 6,
                            1994, between Pertamina and Chinese Petroleum Corporation
                            for sale and purchase of LNG during 1998 and 1999
         10.116#         -- Package V Supply Agreement (1998-1999 LNG Sales to
                            Chinese Petroleum Corporation), dated June 16, 1995, but
                            effective as of December 6, 1994, by and between
                            Pertamina and VICO, Lasmo Sanga Sanga Limited, Opicoil
                            Houston, Inc., Union Texas East Kalimantan Limited,
                            Universe Gas & Oil Company, Inc. and Virginia
                            International Company
         10.117#         -- Trust under the Union Texas Petroleum Deferred
                            Compensation Plan
         10.118#         -- Supplemental Memorandum, dated as of August 24, 1983, by
                            and between Pertamina and Roy M. Huffington, Inc.,
                            Virginia International Company, Ultramar Indonesia
                            Limited, Indonesian Superior Oil Company, Union Texas Far
                            East Corporation and Universe Tankships, Inc.
         10.119#         -- Seventh Supply Agreement for Excess Sales (Additional
                            Fixed Quantities Under Badak LNG Sales Contract as a
                            Result of Contract Amendment and Restatement) between
                            Pertamina and Virginia Indonesia Company, Opicoil
                            Houston, Inc., Ultramar Indonesia Limited, Union Texas
                            East Kalimantan Limited, Universe Gas & Oil Company, Inc.
                            and Virginia International Company, effective as of
                            January 1, 1990
         21.1#           -- List of Subsidiaries
         23.1            -- Consent of Price Waterhouse LLP is included on page S-1
                            of this Annual Report on Form 10-K
         24.1            -- Power of Attorney, pursuant to which amendments to this
                            Annual Report on Form 10-K may be filed, is included on
                            page 82 of this Annual Report on Form 10-K
         27.1#           -- Financial data schedule
</TABLE>
 
- ---------------
 
+ Executive Severance Plan or Arrangement pursuant to Item 601(b)(10)(iii)(A) of
  Regulation S-K.
 
# Filed herewith.
 
(B) REPORTS ON FORM 8-K
 
     The Company filed Current Reports on Form 8-K dated: (i) October 22, 1997
to attach a press release announcing the Company's third quarter earnings and
(ii) February 13, 1998 to report the Venezuelan acquisition of a 100% interest
in the operating services contract for the DZO unit, the drilling results of an
exploration well in China and to attach press releases reporting that five
employees were killed in Pakistan, the appointment of Ambassador Robert Barry to
the Company's Board of Directors, the Company's 1997 year-end and fourth quarter
results and the Company's 1998 capital spending budget.
                                       81
<PAGE>   82
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                        UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                                        By:      /s/ DONALD M. MCMULLAN
                                           -------------------------------------
                                                    Donald M. McMullan
                                               Vice President and Controller
 
Date: February 26, 1998
 
                               POWER OF ATTORNEY
 
     We, the undersigned, directors and officers of Union Texas Petroleum
Holdings, Inc. (the "Company"), do hereby severally constitute and appoint John
L. Whitmire, Larry D. Kalmbach and Donald M. McMullan and each or any one of
them, our true and lawful attorneys and agents, with full power of substitution
and resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all amendments to the Company's Annual Report on
Form 10-K for the fiscal year ended December 31, 1997, and to file the same with
all exhibits thereto, and all other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys and agents, and
each or any of them, full power and authority to do and perform each and every
act and thing requisite and necessary to be done, as fully to all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that said attorneys and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                      TITLE                        DATE
                      ---------                                      -----                        ----
<C>                                                    <S>                                <C>
 
                /s/ JOHN L. WHITMIRE                   Chairman of the Board and Chief     February 26, 1998
- -----------------------------------------------------    Executive Officer (Principal
                 (John L. Whitmire)                      Executive Officer)
 
                /s/ LARRY D. KALMBACH                  Vice President and Chief Financial  February 26, 1998
- -----------------------------------------------------    Officer (Principal Financial
                 (Larry D. Kalmbach)                     Officer)
 
               /s/ DONALD M. MCMULLAN                  Vice President and Controller       February 26, 1998
- -----------------------------------------------------    (Principal Accounting Officer)
                (Donald M. McMullan)
 
                 /s/ ROBERT L. BARRY                   Director                            February 26, 1998
- -----------------------------------------------------
                  (Robert L. Barry)
 
                  /s/ GLENN A. COX                     Director                            February 26, 1998
- -----------------------------------------------------
                   (Glenn A. Cox)
 
                /s/ EDWARD A. GILHULY                  Director                            February 26, 1998
- -----------------------------------------------------
                 (Edward A. Gilhuly)
</TABLE>
 
                                       82
<PAGE>   83
 
<TABLE>
<CAPTION>
                      SIGNATURE                                      TITLE                        DATE
                      ---------                                      -----                        ----
<C>                                                    <S>                                <C>
 
              /s/ JAMES H. GREENE, JR.                 Director                            February 26, 1998
- -----------------------------------------------------
               (James H. Greene, Jr.)
 
                 /s/ HENRY R. KRAVIS                   Director                            February 26, 1998
- -----------------------------------------------------
                  (Henry R. Kravis)
 
              /s/ MICHAEL W. MICHELSON                 Director                            February 26, 1998
- -----------------------------------------------------
               (Michael W. Michelson)
 
                 /s/ WYLIE B. PIEPER                   Director                            February 26, 1998
- -----------------------------------------------------
                  (Wylie B. Pieper)
 
                /s/ STANLEY P. PORTER                  Director                            February 26, 1998
- -----------------------------------------------------
                 (Stanley P. Porter)
 
                /s/ GEORGE R. ROBERTS                  Director                            February 26, 1998
- -----------------------------------------------------
                 (George R. Roberts)
 
                /s/ RICHARD R. SHINN                   Director                            February 26, 1998
- -----------------------------------------------------
                 (Richard R. Shinn)
 
                 /s/ SELLERS STOUGH                    Director                            February 26, 1998
- -----------------------------------------------------
                  (Sellers Stough)
</TABLE>
 
                                       83
<PAGE>   84
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
We hereby consent to the incorporation by reference in the Prospectuses
constituting part of Union Texas Petroleum Holdings, Inc.'s Registration
Statements on Form S-8 (Nos. 33-26105, 33-44045, 33-13575, 33-21684, 33-59213,
33-64928, 333-30805, 333-30807 and 333-30811) and Form S-3 (No. 333-31039) of
our report dated February 16, 1998 appearing on page 38 of this Form 10-K.
 
PRICE WATERHOUSE LLP
 
Houston, Texas
February 26, 1998
 
                                       S-1
<PAGE>   85
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          3.1            -- Restated Certificate of Incorporation of Union Texas
                            Petroleum Holdings, Inc., as amended on May 10, 1995
                            (Filed under the identical exhibit number to the
                            Company's Form 8-K dated May 18, 1995 (Commission File
                            No. 1-9019) and incorporated herein by reference)
          3.2#           -- Bylaws of Union Texas Petroleum Holdings, Inc. as amended
                            December 19, 1997
          3.3            -- Specimen of Certificate evidencing the Common Stock with
                            Rights attached (Filed as Exhibit 3.2 of the Company's
                            Form 10-Q for quarter ended September 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
          4.1            -- Indenture for 8.25% Senior Notes due November 15, 1999,
                            dated as of November 15, 1992, between Union Texas
                            Petroleum Holdings, Inc., the Subsidiaries named therein
                            and State Street Bank and Trust Company (including form
                            of note) (Filed as Exhibit 10.1 to the Company's Form
                            10-Q for quarter ended March 31, 1994 (Commission File
                            No. 1-9019) and incorporated herein by reference)
          4.2            -- Indenture dated as of March 15, 1995, among Union Texas
                            Petroleum Holdings, Inc., the Subsidiaries named therein
                            and The First National Bank of Chicago, as trustee (the
                            "1995 Indenture") (Filed as Exhibit 10.1 to the Company's
                            Form 10-Q for quarter ended March 31, 1995 (Commission
                            File No. 1-9019) and incorporated herein by reference)
          4.3            -- Specimen Form of 8 3/8% Senior Note due March 15, 2005,
                            issued by Union Texas Petroleum Holdings, Inc. pursuant
                            to the 1995 Indenture (Filed as Exhibit 10.2 to the
                            Company's Form 10-Q for quarter ended March 31, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
          4.4            -- Specimen Form of 8 1/2% Senior Note due April 15, 2007,
                            issued by Union Texas Petroleum Holdings, Inc. pursuant
                            to the 1995 Indenture (Filed as Exhibit 10.3 to the
                            Company's Form 10-Q for quarter ended March 31, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
          4.5            -- Supplement dated November 7, 1995 to Indenture dated as
                            of November 15, 1992 for 8.25% Senior Notes due 1999,
                            between Union Texas Petroleum Holdings, Inc., the
                            Subsidiaries named therein and State Street Bank and
                            Trust Company (Filed as Exhibit 4.1 to the Company's Form
                            8-K dated November 17, 1995 (Commission File No. 1-9019)
                            and incorporated herein by reference)
          4.6            -- Supplement dated November 7, 1995 to the 1995 Indenture
                            between Union Texas Petroleum Holdings, Inc., the
                            Subsidiaries named therein and The First National Bank of
                            Chicago (Filed as Exhibit 4.2 to the Company's Form 8-K
                            dated November 17, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
          4.7            -- Form of Fixed Rate Medium-Term Note issued by the Company
                            pursuant to the 1995 Indenture (Filed as Exhibit 4.4 to
                            the Company's Registration Statement No. 33-64049 and
                            incorporated herein by reference). The Company agrees to
                            furnish to the Commission upon request a copy of each
                            instrument with respect to issues of such notes of the
                            Company, the authorized principal amount of which does
                            not exceed 10% of the consolidated assets of the Company
                            and its subsidiaries
</TABLE>
<PAGE>   86
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          4.8            -- Rights Agreement dated as of September 12, 1997 between
                            the Company and First Chicago Trust Company of New York,
                            as Rights Agent, which includes as Exhibit A the Form of
                            Right Certificate and as Exhibit B the Summary of Rights
                            to Purchase Common Stock (Filed as Exhibit 1 to the
                            Company's Form 8-A Registration Statement filed September
                            15, 1997 (Commission File No. 1-9019) and as Exhibit 4.1
                            to the Company's 10-Q for quarter ended September 30,
                            1997 (Commission File No. 1-9019) and incorporated herein
                            by reference)
         10.1            -- Tax Agreement, dated as of June 27, 1985, among Allied
                            Corporation and Union Texas Petroleum Holdings, Inc.
                            (Filed as Exhibit 10.6 to the Company's Registration
                            Statement No. 33-00312 and incorporated herein by
                            reference)
         10.2+           -- Form of Subscription Agreement between Union Texas
                            Petroleum Holdings, Inc. and certain employees (Filed as
                            Exhibit 10.8 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.3+           -- Form of Tagalong Agreement between Union Texas Petroleum
                            Holdings, Inc. and certain employees (Filed as Exhibit
                            10.9 to the Company's Registration Statement No. 33-00312
                            and incorporated herein by reference)
         10.4+           -- Amended and Restated Union Texas Petroleum Salaried
                            Employees' Pension Plan, effective as of January 1, 1994
                            (Filed under the identical exhibit number to the
                            Company's 1993 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.5+           -- Union Texas Petroleum Holdings, Inc. 1985 Stock Option
                            Plan, as amended (Filed as Exhibit 10.10 to Post
                            Effective Amendment No. 2 to the Company's Registration
                            Statement No. 33-12800 and incorporated herein by
                            reference)
         10.6+           -- Amended and Restated Union Texas Petroleum Savings Plan
                            for Salaried Employees, effective as of January 1, 1993
                            (Filed under the identical exhibit number to the
                            Company's 1993 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.7+           -- Amended and Restated Supplemental Non-Qualified Savings
                            Plan for Executive Employees of Union Texas Petroleum
                            Holdings, Inc. and its Subsidiaries, effective as of
                            January 1, 1993 (Filed under the identical exhibit number
                            to the Company's 1993 Form 10-K (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.8+           -- Form of employment letter with executive officers (Filed
                            as Exhibit 10.18 to the Company's Registration Statement
                            No. 33-00312 and incorporated herein by reference) and
                            Exhibit A (Filed as Exhibit 10.10 to the Company's 1992
                            Form 10-K (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.9            -- Joint Venture Agreement, dated as of August 8, 1968,
                            among Roy M. Huffington, Inc., Virginia International
                            Company, Austral Petroleum Gas Corporation, Golden Eagle
                            Indonesia Limited and Union Texas Far East Corporation,
                            as amended (the "Joint Venture Agreement") (Filed as
                            Exhibit 6.6 to the Registration Statement No. 2-58834 of
                            Alaska Interstate Company and incorporated herein by
                            reference)
         10.10           -- Supply Agreement, dated as of April 14, 1981, for Badak
                            LNG Expansion Project among Perusahaan Pertambangan
                            Minyak Dan Gas Bumi Negara ("Pertamina") and the parties
                            to the Joint Venture Agreement (Filed as Exhibit 10.14 to
                            the Company's 1992 Form 10-K (Commission File No. 1-9019)
                            and incorporated herein by reference)
</TABLE>
<PAGE>   87
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.11           -- Indenture, dated as of September 25, 1984, between Unimar
                            Company, as Issuer, and Irving Trust Company, as Trustee,
                            providing for 14,077,747 Indonesian Participating Units
                            (Filed as Exhibit 4 to the Form S-14 Registration
                            Statement No. 2-93037 of Unimar Company and incorporated
                            herein by reference)
         10.12           -- Amended and Restated Agreement of General Partnership of
                            Unimar Company, dated as of September 11, 1990 (Filed as
                            Exhibit 3.1 to the Form 10-Q for quarter ended September
                            30, 1990 of Unimar Company (Commission File No. 1-8791)
                            and incorporated herein by reference)
         10.13           -- License No. P054 concerning all or part of the following
                            blocks in the United Kingdom North Sea: 49/15 and 49/25
                            (Sean Field) (Filed as Exhibit 10.74 to the Company's
                            Registration Statement No. 33-00312 and incorporated
                            herein by reference)
         10.14           -- License No. P220 concerning all or part of the following
                            blocks in the United Kingdom North Sea: 9/26, 14/19,
                            15/11, 15/15, 15/17 and 210/29 (Piper Field) (Filed as
                            Exhibit 10.75 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.15           -- License No. P249 concerning part of the following block
                            in the United Kingdom North Sea: 14/19 (Claymore Field)
                            (Filed as Exhibit 10.76 to the Company's Registration
                            Statement No. 33-00312 and incorporated herein by
                            reference)
         10.16           -- License No. P250 concerning all or part of the following
                            blocks in the United Kingdom North Sea: 9/26, 15/11,
                            15/15, 210/29, 15/17 and 14/19 (Scapa Field) (Filed as
                            Exhibit 10.77 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.17           -- Restated United Kingdom Continental Shelf Operating
                            Agreement (Piper License), dated as of August 11, 1977,
                            among Occidental Petroleum (U.K.) Limited, Occidental of
                            Britain, Inc., Getty Oil (Britain) Limited, Allied
                            Chemical (Great Britain) Limited, Allied Chemical (North
                            Sea) Ltd., Thomson North Sea Limited and the British
                            National Oil Corporation (Filed as Exhibit No. 10.78 to
                            the Company's Registration Statement No. 33-00312 and
                            incorporated herein by reference)
         10.18           -- Restated United Kingdom Continental Shelf Operating
                            Agreement (Claymore License), dated August 11, 1977,
                            among Occidental Petroleum (Caledonia) Limited,
                            Occidental of Scotland, Inc., Getty Oil (Britain)
                            Limited, Allied Chemical (Great Britain) Limited, Allied
                            Chemical (North Sea) Ltd., Thomson North Sea Limited and
                            the British National Oil Corporation (Filed as Exhibit
                            10.79 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.19           -- United Kingdom Continental Shelf Joint Operating
                            Agreement for Blocks 49/15a and 49/25a (Sean Field),
                            dated July 3, 1984, among Shell U.K. Limited, Union Texas
                            Petroleum Limited, Britoil Public Limited Company and
                            Esso Exploration and Production U.K. Limited (Filed as
                            Exhibit 10.81 to the Company's Registration Statement No.
                            33-00312 and incorporated herein by reference)
         10.20           -- Agreement for Sale and Purchase of Natural Gas from the
                            Sean North and Sean South Fields, dated November 7, 1984,
                            between Union Texas Petroleum Limited and British Gas
                            Corporation, including list of omitted schedules (Filed
                            as Exhibit 10.82 to the Company's Registration Statement
                            No. 33-00312 and incorporated herein by reference)
</TABLE>
<PAGE>   88
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.21           -- Badak III LNG Sales Contract, dated March 19, 1987,
                            between Pertamina, as Seller, and Chinese Petroleum
                            Corporation, as Buyer (Filed as Exhibit 10.28 to the
                            Company's 1992 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.22           -- Supplemental Indenture, dated as of October 31, 1986, to
                            the Indenture between Unimar Company and Irving Trust
                            Company (Exhibit 10.13 above) (Filed as Exhibit 10.114 to
                            the Company's Registration Statement No. 33-16267 and
                            incorporated herein by reference)
         10.23           -- Amended and Restated Registration Rights Agreement, dated
                            September 30, 1987, among Union Texas Petroleum Holdings,
                            Inc. and Certain Holders of Certain Securities of Union
                            Texas Petroleum Holdings, Inc. (Filed as Exhibit 10.117
                            to Post Effective Amendment No. 1 to the Company's
                            Registration Statement No. 33-12800 and incorporated
                            herein by reference)
         10.24+          -- Union Texas Petroleum Holdings, Inc. 1987 Stock Option
                            Plan and First Amendment to Union Texas Petroleum
                            Holdings, Inc. 1987 Stock Option Plan (Filed as Exhibit
                            4.4 to the Company's Registration Statement No. 33-21684
                            and incorporated herein by reference)
         10.25           -- Badak III LNG Sales Contract Supply Agreement, dated
                            October 19, 1987, among Pertamina and the parties to the
                            Joint Venture Agreement (Filed as Exhibit 10.132 to Post
                            Effective Amendment No. 1 to the Company's Registration
                            Statement No. 33-12800 and incorporated herein by
                            reference)
         10.26           -- $316,000,000 Bontang III Loan Agreement, dated February
                            9, 1988, among the Trustee under the Bontang III Trustee
                            and Paying Agent Agreement, Train-E Finance Co., Ltd., as
                            Tranche A Lender and The Industrial Bank of Japan Trust
                            Company as Agent for the Tranche B Lenders and as Tranche
                            B Lender (Filed as Exhibit 10.83 to Post Effective
                            Amendment No. 2 to the Company's Registration Statement
                            No. 33-12800 and incorporated herein by reference)
         10.27           -- Bontang III Producers Agreement, dated as of February 9,
                            1988, among Pertamina, Roy M. Huffington, Inc.,
                            Huffington Corporation, VICO, Virginia International
                            Company, Ultramar Indonesia Company Limited, Union Texas
                            East Kalimantan Limited, Universe Tankships, Inc., Total
                            Indonesie, Unocal Indonesia, Ltd., Indonesia Petroleum,
                            Ltd., in favor of Train-E Finance Co., Ltd., as Tranche A
                            Lender, The Industrial Bank of Japan Trust Company as
                            Agent for the Tranche B Lenders and as Tranche B Lender,
                            and the other Tranche B Lenders named therein (Filed as
                            Exhibit 10.84 to the Post Effective Amendment No. 2 to
                            the Company's Registration Statement No. 33-12800 and
                            incorporated herein by reference)
         10.28           -- Bontang III Trustee and Paying Agent Agreement, dated
                            February 9, 1988, among Pertamina, Roy M. Huffington,
                            Inc., Huffington Corporation, Virginia International
                            Company, VICO, Ultramar Indonesia Limited, Union Texas
                            East Kalimantan Limited, Universe Tankships, Inc., Total
                            Indonesie, Unocal Indonesia, Ltd., Indonesia Petroleum,
                            Ltd. and the Trustee thereunder (Filed as Exhibit 10.42
                            to the Company's 1991 Form 10-K (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.29+          -- Third Amendment to Union Texas Petroleum Holdings, Inc.
                            1985 Stock Option Plan (Filed as Exhibit 10.95 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
</TABLE>
<PAGE>   89
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.30+          -- Second Amendment to Union Texas Petroleum Holdings, Inc.
                            1987 Stock Option Plan (Filed as Exhibit 10.96 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.31+          -- Union Texas Petroleum Supplemental Retirement Plan (Filed
                            as Exhibit 10.99 to the Company's Form 10-Q for quarter
                            ended June 30, 1990 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.32+          -- Amended and Restated Union Texas Petroleum Supplemental
                            Retirement Plan II, effective January 1, 1994 (Filed as
                            Exhibit 10.41 to the Company's 1993 Form 10-K (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.33+          -- Union Texas Petroleum Supplemental Retirement Plans
                            Trust, as amended (Filed as Exhibit 10.101 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.34           -- Amended and Restated Production Sharing Contract
                            effective August 8, 1968-August 7, 1998 among Pertamina,
                            Roy M. Huffington, Inc., VICO, Virginia International
                            Company, Ultramar Indonesia Limited, Union Texas East
                            Kalimantan Limited, Universe Gas & Oil Company, Inc. and
                            Huffington Corporation (Filed as Exhibit 10.102 to the
                            Company's Form 10-Q for quarter ended June 30, 1990
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.35           -- Production Sharing Contract effective August 8,
                            1998-August 7, 2018 among Pertamina, Roy M. Huffington,
                            Inc., VICO, Virginia International Company, Ultramar
                            Indonesia Limited, Union Texas East Kalimantan Limited,
                            Universe Gas & Oil Company, Inc. and Huffington
                            Corporation (Filed as Exhibit 10.103 to the Company's
                            Form 10-Q for quarter ended June 30, 1990 (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.36           -- Joint Operating Agreement for the Scapa Field, dated
                            December 23, 1985, among Occidental Petroleum (Caledonia)
                            Limited, Texaco Britain Limited, Union Texas Petroleum
                            Limited, Thomson North Sea Limited, Thomson Scottish
                            Petroleum Limited and the Oil and Pipelines Agency (Filed
                            as Exhibit 10.104 to the Company's Form 10-Q for quarter
                            ended June 30, 1990 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.37           -- Amended and Restated 1973 LNG Sales Contract, dated as of
                            the 1st day of January, 1990, by and between Pertamina,
                            as Seller, and Chubu Electric Power Co., Inc., The Kansai
                            Electric Power Co., Inc., Kyushu Electric Power Co.,
                            Inc., Nippon Steel Corporation, Osaka Gas Co., Ltd. and
                            Toho Gas Co., Ltd., as Buyers (Filed as Exhibit (10)-8 to
                            the 1993 Form 10-K of Unimar Company (Commission File No.
                            1-8791) and incorporated herein by reference)
         10.38           -- Amended and Restated Bontang Processing Agreement, dated
                            February 9, 1988, among Pertamina and Roy M. Huffington,
                            Inc., Huffington Corporation, VICO, Virginia
                            International Company, Ultramar Indonesia Limited, Union
                            Texas East Kalimantan Limited, Universe Tankships, Inc.,
                            Total Indonesie, Unocal Indonesia, Ltd., Indonesia
                            Petroleum, Ltd. and P.T. Badak Natural Gas Liquefaction
                            Company (Filed as Exhibit (10)-39 to the 1988 Form 10-K
                            of Unimar Company (Commission File No. 1-8791) and
                            incorporated herein by reference)
</TABLE>
<PAGE>   90
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.39           -- Amended and Restated Debt Service Allocation Agreement,
                            dated February 9, 1988, among Pertamina and Roy M.
                            Huffington, Inc., VICO, Ultramar Indonesia Limited,
                            Virginia International Company, Union Texas East
                            Kalimantan Limited, Universe Tankships, Inc., Huffington
                            Corporation, Total Indonesie, Unocal Indonesia, Ltd. and
                            Indonesia Petroleum, Ltd. (Filed as Exhibit (10)-40 to
                            the 1988 Form 10-K of Unimar Company (Commission File No.
                            1-8791) and incorporated herein by reference)
         10.40           -- Amendment No. 1 to Bontang III Producers Agreement, dated
                            as of May 31, 1988, among Pertamina, Roy M. Huffington,
                            Inc., Huffington Corporation, VICO, Virginia
                            International Company, Ultramar Indonesia Limited, Union
                            Texas East Kalimantan Limited, Universe Tankships, Inc.,
                            Total Indonesie, Unocal Indonesia, Ltd., Indonesia
                            Petroleum, Ltd. and Train-E Finance Co., Ltd., as Tranche
                            A Lender, and The Industrial Bank of Japan Trust Company
                            on behalf of the Tranche B Lender, (Filed as Exhibit
                            (10)-21 to the 1993 Form 10-K of Unimar Company
                            (Commission File No. 1-8791) and incorporated herein by
                            reference)
         10.41           -- Badak IV LNG Sales Contract, dated October 23, 1990,
                            between Pertamina, as Seller, and Osaka Gas Co., Ltd.,
                            Tokyo Gas Co., Ltd. and Toho Gas Co., Ltd., as Buyer
                            (Filed as Exhibit (10)-65 to the 1990 Form 10-K of Unimar
                            Company (Commission File No. 1-8791) and incorporated
                            herein by reference)
         10.42           -- Supply Agreement for Natural Gas to Badak IV LNG Sales
                            Contract, dated August 12, 1991, by and between
                            Pertamina, VICO, Opicoil Houston, Inc., Ultramar
                            Indonesia Limited, Union Texas East Kalimantan Limited,
                            Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.80 to the
                            Company's 1991 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.43           -- LNG Sales and Purchase Contract (Korea II), dated May 7,
                            1991, between Pertamina, as Seller, and Korea Gas
                            Corporation, as Buyer (Filed as Exhibit (10)-1 to the
                            1990 Form 10-Q for quarter ended June 30, 1991 of Unimar
                            Company (Commission File No. 1-8791) and incorporated
                            herein by reference)
         10.44           -- $750,000,000 Bontang IV Loan Agreement, dated as of
                            August 26, 1991, among the Trustee under the Bontang IV
                            Trustee and Paying Agent Agreement as Borrower, Chase
                            Manhattan Asia Limited and The Mitsubishi Bank, Limited
                            as Coordinators, the other banks and financial
                            institutions named therein as Arrangers, Co-Arrangers,
                            Lead Managers, Managers, Co-Managers and Lenders, The
                            Chase Manhattan Bank, N.A. and The Mitsubishi Bank,
                            Limited as Co-Agents and The Chase Manhattan Bank, N.A.
                            as Agent (Filed as Exhibit 10.1 to the Form 10-Q for
                            quarter ended September 30, 1991 of Unimar Company
                            (Commission File No. 1-8791) and incorporated herein by
                            reference)
         10.45           -- Bontang IV Producers Agreement, dated as of August 26,
                            1991, by Pertamina, Virginia International Company,
                            Opicoil Houston, Inc., VICO, Ultramar Indonesia Limited,
                            Union Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc., Total Indonesie, Unocal Indonesia, Ltd.
                            and Indonesia Petroleum, Ltd. in favor of The Chase
                            Manhattan Bank, N.A., as Agent for the Lenders and as
                            Lender, and the other Lenders named therein (Filed as
                            Exhibit 10.2 to the Form 10-Q for quarter ended September
                            30, 1991 of Unimar Company (Commission File No. 1-8791)
                            and incorporated herein by reference)
</TABLE>
<PAGE>   91
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.46           -- Bontang IV Trustee and Paying Agent Agreement, dated as
                            of August 26, 1991, among Pertamina, Virginia
                            International Company, Opicoil Houston, Inc., VICO,
                            Ultramar Indonesia Limited, Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc., Total
                            Indonesie, Unocal Indonesia, Ltd., Indonesia Petroleum,
                            Ltd. and the Trustee thereunder (Filed as Exhibit 10.3 to
                            the Form 10-Q for quarter ended September 30, 1991 of
                            Unimar Company (Commission File No. 1-8791) and
                            incorporated herein by reference)
         10.47           -- Consulting Agreement, dated as of November 18, 1992,
                            among Petroleum Associates, L.P., KKR Partners II, L.P.
                            and Union Texas Petroleum Holdings, Inc. (Filed as
                            Exhibit 10.81 to the Company's 1992 Form 10-K (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.48+          -- Second Amendment to Union Texas Petroleum Supplemental
                            Retirement Plans Trust (Filed as Exhibit 10.82 to the
                            Company's 1992 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.49           -- Amendment No. 1 to Bontang III Trustee and Paying Agent
                            Agreement, dated as of December 11, 1992, among
                            Pertamina, VICO, Virginia International Company, Ultramar
                            Indonesia Limited, Union Texas East Kalimantan Limited,
                            Opicoil Houston, Inc., Universe Gas & Oil Company, Inc.,
                            Total Indonesie, Unocal Indonesia Ltd., Indonesia
                            Petroleum, Ltd. and the Bontang III Trustee (Filed as
                            Exhibit 10.83 to the Company's 1992 Form 10-K (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.50+          -- First Amendment to Union Texas Petroleum Supplemental
                            Retirement Plan (Filed as Exhibit 10.85 to the Company's
                            1992 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.51+          -- Union Texas Petroleum Holdings, Inc. 1992 Stock Option
                            Plan (Filed as Exhibit 4.3 to the Company's Registration
                            Statement No. 33-64928 and incorporated herein by
                            reference)
         10.52           -- Arun and Bontang LPG Sales and Purchase Contract, dated
                            July 15, 1986, between Pertamina, as Seller, and
                            Mitsubishi Corporation, Cosmo Oil Co., Ltd., Nippon
                            Petroleum Gas Co., Ltd., Showa Shell Sekiyu K.K., Kyodo
                            Oil Co., Ltd., Idemitsu Kosan Co., Ltd. and Mitsui
                            Liquefied Gas Co., Ltd., as Buyers (Filed as Exhibit
                            (10)-60 to the 1991 Form 10-K of Unimar Company
                            (Commission File No. 1-8791) and incorporated herein by
                            reference)
         10.53           -- Petroleum Concession Agreement, dated January 21, 1992,
                            between the President of the Islamic Republic of Pakistan
                            and Union Texas Pakistan, Inc., Occidental Petroleum
                            (Pakistan) Inc. and Oil & Gas Development Corporation
                            (Filed as Exhibit 10.87 to the Company's Form 10-Q for
                            quarter ended March 31, 1992 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.54           -- Amended and Restated Supply Agreement (In support of the
                            Amended and Restated 1973 LNG Sales Contract), dated
                            September 22, 1993, and effective December 3, 1973,
                            between Pertamina and VICO, LASMO Sanga Sanga Limited,
                            Opicoil Houston, Inc., Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.75 to the
                            Company's 1993 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
</TABLE>
<PAGE>   92
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.55           -- Share Sale Agreement, dated October 18, 1994, among Union
                            Texas Petroleum Limited, Fina Petroleum Development
                            Limited and Fina Exploration Limited (the "Share Sale
                            Agreement") (Filed as Exhibit 2.1 to the Company's Form
                            8-K dated November 14, 1994 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.56           -- Guarantee, dated October 18, 1994, by Union Texas
                            International Corporation relating to the Share Sale
                            Agreement (Filed as Exhibit 2.3 to the Company's Form 8-K
                            dated November 14, 1994 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.57           -- Petroleum Concession Agreement, dated April 20, 1977,
                            between the President of Pakistan and Union Texas
                            Pakistan, Inc. (Filed as Exhibit 10.87 to the Company's
                            1994 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.58           -- Amendments to Arun and Bontang LPG Sales and Purchase
                            Contract, dated October 5, 1994, between Pertamina, as
                            Seller, and Mitsubishi Corporation, Cosmo Oil Co., Ltd.,
                            Nippon Petroleum Gas Co., Ltd., Showa Shell Sekiyu K.K.,
                            Japan Energy Corporation, Idemitsu Kosan Co., Ltd. and
                            Mitsui Oil & Gas Co., Ltd., as Buyers (Filed as Exhibit
                            10.88 to the Company's 1994 Form 10-K (Commission File
                            No. 1-9019) and incorporated herein by reference)
         10.59           -- Amendment to the Amended and Restated 1973 LNG Sales
                            Contract, dated as of the 1st day of June 1992, by and
                            between Pertamina, as Seller, and Kyushu Electric Power
                            Co., Inc., Nippon Steel Corporation and Toho Gas Co.,
                            Ltd., as Buyers (Filed as Exhibit (10)-9 to the 1993 Form
                            10-K of Unimar Company (Commission File No. 1-8791) and
                            incorporated herein by reference)
         10.60           -- Facility Agreement, dated May 26, 1995, among Union Texas
                            Britannia Limited, Chemical Bank, as Arranger,
                            NationsBank, N.A. Carolinas, as Facility Agent, National
                            Westminster Bank plc, as Funding Agent, and the
                            Co-Arrangers, Technical Agents, Account Bank and Banks
                            named therein (Filed as Exhibit 10.9 to the Company's
                            Form 10-Q for quarter ended June 30, 1995 (Commission
                            File No. 1-9019) and incorporated herein by reference)
         10.61           -- Sponsor Direct Agreement, dated May 26, 1995, among Union
                            Texas Petroleum Limited, Union Texas Britannia Limited
                            and NationsBank N.A. Carolinas, as Facility Agent (Filed
                            as Exhibit 10.10 to the Company's Form 10-Q for quarter
                            ended June 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.62           -- Sponsor Support Agreement, dated May 26, 1995, between
                            Union Texas Petroleum Limited and Union Texas Britannia
                            Limited (Filed as Exhibit 10.11 to the Company's Form
                            10-Q for quarter ended June 30, 1995 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.63+          -- Union Texas Petroleum Holdings, Inc. 1994 Incentive Plan
                            (Filed as Exhibit 10.12 to the Company's Form 10-Q for
                            quarter ended June 30, 1995 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.64+          -- First Amendment to Union Texas Petroleum Holdings, Inc.
                            1992 Stock Option Plan (Filed as Exhibit 10.13 to the
                            Company's Form 10-Q for quarter ended June 30, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
</TABLE>
<PAGE>   93
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.65           -- Sale and Purchase Agreement dated May 31, 1995, between
                            Union Texas Petroleum Limited and Oryx U.K. Energy
                            Company (Filed as Exhibit 10.14 to the Company's Form
                            10-Q for quarter ended June 30, 1995 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.66           -- Bontang V Loan Agreement, dated as of July 1, 1995, among
                            BankAmerica International, as Trustee under the Bontang V
                            Trustee and Paying Agent Agreement, as Borrower, Bontang
                            Train-G Project Finance Co., Ltd. ("Tranche A Lender"),
                            the Banks named therein as Tranche B Lenders, The
                            Long-Term Credit Bank of Japan, Limited, New York Branch
                            ("Facility Agent"), The Fuji Bank, Limited
                            ("Intercreditor Agent"), Credit Lyonnais ("Technical
                            Agent"), and Credit Lyonnais, The Fuji Bank, Limited and
                            The Long-Term Credit Bank of Japan, Limited
                            (collectively, the "Arrangers") (Filed as Exhibit 10.1 to
                            the Company's Form 10-Q for quarter ended September 30,
                            1995 (Commission File No. 1-9019) and incorporated herein
                            by reference)
         10.67           -- Bontang V Producers Agreement, dated as of July 1, 1995,
                            by Pertamina, VICO, OPICOIL Houston, Inc., Virginia
                            International Company, LASMO Sanga Sanga Limited, Union
                            Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc., Total Indonesie, Unocal Indonesia Company
                            and Indonesia Petroleum, Ltd. (collectively, the
                            "Producers"), in favor of the Tranche A Lender, the Banks
                            named therein as Tranche B Lenders and the Facility
                            Agent, Intercreditor Agent and Technical Agent (Filed as
                            Exhibit 10.2 to the Company's Form 10-Q for quarter ended
                            September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.68           -- Bontang V Trustee and Paying Agent Agreement, dated as of
                            July 1, 1995, among the Producers and BankAmerica
                            International, as Trustee and Paying Agent (Filed as
                            Exhibit 10.3 to the Company's Form 10-Q for quarter ended
                            September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.69           -- Amendment No. 1 to Bontang III Loan Agreement, dated as
                            of July 1, 1995, among Continental Bank International, as
                            Trustee under the Bontang III Trustee and Paying Agent
                            Agreement, Train-E Finance Co., Ltd., as Tranche A
                            Lender, and The Industrial Bank of Japan Trust Company,
                            as Agent on behalf of the Majority Tranche B Lenders
                            (Filed as Exhibit 10.6 to the Company's Form 10-Q for
                            quarter ended September 30, 1995 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.70           -- Second Amended and Restated 1973 LNG Sales Contract,
                            dated as of August 3, 1995, between Pertamina, as Seller,
                            and Chubu Electric Power Co., Inc., The Kansai Electric
                            Power Co., Inc., Kyushu Electric Power Co., Inc., Nippon
                            Steel Corporation, Osaka Gas Co., Ltd. and Toho Gas Co.,
                            Ltd., as the Buyers, with related letter agreement, dated
                            August 3, 1995, between Seller and Buyers (Filed as
                            Exhibit 10.7 to the Company's Form 10-Q for quarter ended
                            September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.71           -- Package V Supply Agreement for Natural Gas in Support of
                            the 1973 LNG Sales Contract Extension, dated June 16,
                            1995, effective October 6, 1994, between Pertamina and
                            VICO, LASMO Sanga Sanga Limited, OPICOIL Houston, Inc.,
                            Union Texas East Kalimantan Limited, Universe Gas and Oil
                            Company, Inc. and Virginia International Company (Filed
                            as Exhibit 10.8 to the Company's Form 10-Q for quarter
                            ended September 30, 1995 (Commission File No. 1-9019) and
                            incorporated herein by reference)
</TABLE>
<PAGE>   94
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.72+          -- First Amendment to Union Texas Petroleum Savings Plan for
                            Salaried Employees (Filed as Exhibit 10.9 to the
                            Company's Form 10-Q for quarter ended September 30, 1995
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.73+          -- Second Amendment to Union Texas Petroleum Savings Plan
                            for Salaried Employees (Filed as Exhibit 10.103 to the
                            Company's 1995 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.74           -- Second Amended and Restated 1981 Badak LNG Sales
                            Contract, dated as of August 3, 1995, between Pertamina,
                            as Seller, and Chubu Electric Power Co., Inc., The Kansai
                            Electric Power Co., Inc., Osaka Gas Co., Ltd. and Toho
                            Gas Co., Ltd., as Buyers, with related letter agreement,
                            dated August 3, 1995, between Seller and Buyers (Filed as
                            Exhibit 10.104 to the Company's 1995 Form 10-K
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.75           -- LNG Sales and Purchase Contract (Badak V), dated August
                            12, 1995, between Pertamina and Korea Gas Corporation
                            (Filed as Exhibit 10.105 to the Company's 1995 Form 10-K
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.76           -- LNG Sale and Purchase Contract (Badak VI), dated October
                            25, 1995, between Pertamina and Chinese Petroleum
                            Corporation (Filed as Exhibit 10.106 to the Company's
                            1995 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.77           -- Badin-II Revised Petroleum Concession Agreement, dated
                            January 22, 1995 between the President of the Islamic
                            Republic of Pakistan and Union Texas Pakistan, Inc.,
                            Occidental Petroleum (Pakistan), Inc., Oil and Gas
                            Development Corporation and the Federal Government of the
                            Islamic Republic of Pakistan (Filed as Exhibit 10.107 to
                            the Company's 1995 Form 10-K (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.78+          -- Third Amendment to Union Texas Petroleum Savings Plan for
                            Salaried Employees (Filed as Exhibit 10.1 to the
                            Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.79           -- First Supply Agreement for Package V Excess Sales
                            (1998-1999 LNG Sales to Korea Gas Corporation under Badak
                            V), dated as of May 1, 1996, between Pertamina and
                            Virginia Indonesia Company, Lasmo Sanga Sanga Limited,
                            Opicoil Houston, Inc., Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.2 to the
                            Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.80           -- Package VI Supply Agreement for Natural Gas in Support of
                            2000-2017 LNG Sales to Korea Gas Corporation under Badak
                            V, dated as of May 1, 1996, between Pertamina and
                            Virginia Indonesia Company, Lasmo Sanga Sanga Limited,
                            Opicoil Houston, Inc., Union Texas East Kalimantan
                            Limited, Universe Gas & Oil Company, Inc. and Virginia
                            International Company (Filed as Exhibit 10.4 to the
                            Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
</TABLE>
<PAGE>   95
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.81           -- Package VI Supply Agreement for Natural Gas in Support of
                            2000-2017 LNG Sales to Chinese Petroleum Corporation
                            under Badak VI, dated as of May 1, 1996, between
                            Pertamina and Virginia Indonesia Company, Lasmo Sanga
                            Sanga Limited, Opicoil Houston, Inc., Union Texas East
                            Kalimantan Limited, Universe Gas & Oil Company, Inc. and
                            Virginia International Company (Filed as Exhibit 10.5 to
                            the Company's Form 10-Q for quarter ended June 30, 1996
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.82           -- First Supply Agreement for Package VI Excess Sales
                            (2003-2008 LNG Sales under the Second Amended and
                            Restated 1981 Badak Sales Contract), dated as of May 1,
                            1996, between Pertamina and Virginia Indonesia Company,
                            Lasmo Sanga Sanga Limited, Opicoil Houston, Inc., Union
                            Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc. and Virginia International Company (Filed
                            as Exhibit 10.6 to the Company's Form 10-Q for quarter
                            ended June 30, 1996 (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.83+          -- First Amendment to Supplemental Non-Qualified Savings
                            Plan for Executive Employees (Filed as Exhibit 10.1 to
                            the Company's Form 10-Q for quarter ended September 30,
                            1996 (Commission File No. 1-9019) and incorporated herein
                            by reference)
         10.84+          -- Second Amendment to the Salaried Employees' Pension Plan
                            (Filed as Exhibit 10.2 to the Company's Form 10-Q for
                            quarter ended September 30, 1996 (Commission File No.
                            1-9019) and incorporated herein by reference)
         10.85           -- License No. P213 and Deed of License Assignment covering
                            United Kingdom North Sea Blocks 16/26 (Britannia and Alba
                            Fields) and 28/5a (Filed as Exhibit 10.105 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.86+          -- First Amendment to Union Texas Petroleum Holdings, Inc.
                            1994 Incentive Plan (Filed as Exhibit 10.107 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.87+          -- Second Amendment to Union Texas Petroleum Holdings, Inc.
                            1992 Stock Option Plan (Filed as Exhibit 10.108 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.88+          -- Third Amendment to Union Texas Petroleum Holdings, Inc.
                            1987 Stock Option Plan (Filed as Exhibit 10.109 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.89+          -- Fourth Amendment to Union Texas Petroleum Holdings, Inc.
                            1985 Stock Option Plan (filed as Exhibit 10.110 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.90+          -- First Amendment to Union Texas Petroleum Supplemental
                            Retirement Plan II (filed as Exhibit 10.111 to the
                            Company's 1996 Form 10-K (Commission File No. 1-9019) and
                            incorporated herein by reference)
         10.91           -- Second Amended and Restated Credit Agreement dated as of
                            March 29, 1996 among Union Texas Petroleum Holdings,
                            Inc., the Banks and Co-Agents listed therein and
                            NationsBank of Texas, N.A., as Agent (Filed as Exhibit
                            10.1 to the Company's Form 10-Q for quarter ended March
                            31, 1996 (Commission File No. 1-9019) and incorporated
                            herein by reference)
</TABLE>
<PAGE>   96
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.92           -- First Amendment Agreement dated as of March 11, 1997 to
                            the Second Amended and Restated Credit Agreement dated as
                            of March 29, 1996, among Union Texas Petroleum Holdings,
                            Inc., the Banks and Co-Agents listed therein and
                            NationsBank of Texas, N.A., as Agent (Filed as Exhibit
                            10.1 to the Company's Form 10-Q for quarter ended March
                            31, 1997 (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.93           -- Credit Agreement dated as of March 11, 1997 among Union
                            Texas Petroleum Holdings, Inc., the Banks and Co-Agents
                            listed therein and NationsBank of Texas, N.A., as Agent
                            (Filed as Exhibit 10.2 to the Company's Form 10-Q for
                            quarter ended March 31, 1997 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.94           -- $1,127,000,000 Bontang VI Loan Agreement, dated as of
                            March 4, 1997, among Bank of America National Trust and
                            Savings Association, as Trustee under the Bontang VI
                            Trustee and Paying Agent Agreement, as Borrower, Bank of
                            Taiwan New York Agency as Lead Arranger, Bontang LNG
                            Train-H Investment Co., Ltd. as Co-Lead Arranger, The
                            Chase Manhattan Bank as Agent, Co-Agent and Co-Arranger,
                            and the Co-Agents, Co-Arrangers and Lenders named therein
                            (Filed as Exhibit 10.3 to the Company's Form 10-Q for
                            quarter ended March 31, 1997 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.95           -- Bontang VI Producers Agreement, dated as of March 4,
                            1997, by Pertamina, Total Indonesie, VICO, Union Texas
                            East Kalimantan Limited, Lasmo Sanga Sanga Limited,
                            Virginia International Company, Opicoil Houston, Inc.,
                            Universe Gas & Oil Company, Inc., Indonesia Petroleum,
                            Ltd., Unocal Indonesia Company (collectively, the
                            "Producers"), in favor of Bank of Taiwan New York Agency,
                            as Lead Arranger, Bontang LNG Train-H Investment Co.,
                            Ltd. as Co-Lead Arranger, The Chase Manhattan Bank as
                            Agent, Co-Agent and Co-Arranger, and the Co-Agents,
                            Co-Arrangers and Lenders named therein (Filed as Exhibit
                            10.4 to the Company's Form 10-Q for quarter ended March
                            31, 1997 (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.96           -- Bontang VI Trustee and Paying Agent Agreement, dated as
                            of March 4, 1997, among the Producers and Bank of America
                            National Trust and Savings Association, as Trustee and
                            Paying Agent (Filed as Exhibit 10.5 to the Company's Form
                            10-Q for quarter ended March 31, 1997 (Commission File
                            No. 1-9019) and incorporated herein by reference)
         10.97           -- Letter Agreement Amendment to Facility Agreement dated
                            May 26, 1995 between Union Texas Britannia Limited as
                            Borrower and The Chase Manhattan Bank as Arranger,
                            NationsBank, N.A. as Facility Agent and the Technical
                            Agents, Funding Agent, Account Bank and the other
                            financial institutions named therein (Filed as Exhibit
                            10.6 to the Company's Form 10-Q for quarter ended March
                            31, 1997 (Commission File No. 1-9019) and incorporated
                            herein by reference)
         10.98           -- Amendment No. 2 to Bontang III Loan Agreement, dated as
                            of March 4, 1997 among BankAmerica International, as
                            Trustee under the Bontang III Trustee and Paying Agent
                            Agreement, Train-E Finance Co., Ltd. as Tranche A Lender
                            and The Industrial Bank of Japan Trust Company, as agent
                            on behalf of the Majority Tranche B Lenders (Filed as
                            Exhibit 10.7 to the Company's Form 10-Q for quarter ended
                            March 31, 1997 (Commission File No. 1-9019) and
                            incorporated herein by reference)
</TABLE>
<PAGE>   97
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.99           -- Second Amendment to the Union Texas Petroleum Holdings,
                            Inc. 1994 Incentive Plan (Filed as Exhibit 10.2 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.100          -- Third Amendment to Union Texas Petroleum Holdings, Inc.
                            1992 Stock Option Plan (Filed as Exhibit 10.3 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.101          -- Fourth Amendment to Union Texas Petroleum Holdings, Inc.
                            1987 Stock Option Plan (Filed as Exhibit 10.4 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.102          -- Fifth Amendment to Union Texas Petroleum Holdings, Inc.
                            1986 Stock Option Plan (Filed as Exhibit 10.5 to the
                            Company's Form 10-Q for quarter ended June 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.103          -- Third Amendment to Union Texas Petroleum Salaried
                            Employees' Pension Plan (Filed as Exhibit 10.1 to the
                            Company's Form 10-Q for quarter ended September 30, 1997
                            (Commission File No. 1-9019) and incorporated herein by
                            reference)
         10.104          -- Stock Purchase Agreement dated as of January 27, 1998
                            between Occidental Oil and Gas Corporation, Union Texas
                            Venezuela Limited and Union Texas International
                            Corporation (Filed as Exhibit 2.1 to the Company's Form
                            8-K filed February 13, 1998 (Commission File No. 1-9019)
                            and incorporated herein by reference)
         10.105+#        -- Conformed Union Texas Petroleum Holdings, Inc. Executive
                            Severance Plan
         10.106#         -- Boqueron Operating Agreement dated July 29, 1997 between
                            Lagoven, S.A. and Union Texas Venezuela Limited and
                            Preussag Energie GmbH (portions have been omitted
                            pursuant to a request for confidential treatment under
                            the Securities Exchange Act of 1934)
         10.107#         -- DZO Operating Services Agreement dated November 19, 1993
                            between Compania Occidental de Hidrocarburos, Inc. and
                            Maraven, S.A., as amended by Addendum No. 1 dated
                            December 7, 1994 (portions have been omitted pursuant to
                            a request for confidential treatment under the Securities
                            Exchange Act of 1934)
         10.108#         -- Loan Agreement dated February 4, 1998 between Compania
                            Occidental de Hidrocarburos, Inc., as Borrower and
                            NationsBank of Texas, N.A. with Promissory Note attached
                            as Exhibit A and Guaranty Agreement dated as of February
                            4, 1998 between Union Texas Petroleum Holdings, Inc., as
                            Guarantor, and NationsBank of Texas, N.A., as Lender,
                            attached as Exhibit B
         10.109+#        -- Fourth Amendment to Union Texas Petroleum Salaried
                            Employees' Pension Plan
         10.110+#        -- Fourth Amendment to Union Texas Petroleum Savings Plan
                            for Salaried Employees
         10.111+#        -- Amended and Restated Union Texas Petroleum Deferred
                            Compensation Plan
         10.112#         -- Addendum to Badak IV LNG Sales Contract Supply Agreement,
                            dated January 31, 1994, but effective as of October 23,
                            1990, by and between Pertamina, on the one hand, and
                            VICO, LASMO Sanga Sanga Limited, Opicoil Houston, Inc.,
                            Union Texas East Kalimantan Limited, Universe Gas & Oil
                            Company, Inc. and Virginia International Company
         10.113#         -- Memorandum of Agreement, dated September 30, 1994 by and
                            between Pertamina and Korea Gas Corporation
</TABLE>
<PAGE>   98
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
         10.114#         -- Package V Supply Agreement (1995-1999 LNG Sales to Korea
                            Gas Corporation), dated June 16, 1995, but effective as
                            of September 30, 1994, between Pertamina and VICO, LASMO
                            Sanga Sanga Limited, Opicoil Houston, Inc., Union Texas
                            East Kalimantan Limited, Universe Gas & Oil Company, Inc.
                            and Virginia International Company
         10.115#         -- Memorandum of Agreement, effective as of December 6,
                            1994, between Pertamina and Chinese Petroleum Corporation
                            for sale and purchase of LNG during 1998 and 1999
         10.116#         -- Package V Supply Agreement (1998-1999 LNG Sales to
                            Chinese Petroleum Corporation), dated June 16, 1995, but
                            effective as of December 6, 1994, by and between
                            Pertamina and VICO, Lasmo Sanga Sanga Limited, Opicoil
                            Houston, Inc., Union Texas East Kalimantan Limited,
                            Universe Gas & Oil Company, Inc. and Virginia
                            International Company
         10.117#         -- Trust under the Union Texas Petroleum Deferred
                            Compensation Plan
         10.118#         -- Supplemental Memorandum, dated as of August 24, 1983, by
                            and between Pertamina and Roy M. Huffington, Inc.,
                            Virginia International Company, Ultramar Indonesia
                            Limited, Indonesian Superior Oil Company, Union Texas Far
                            East Corporation and Universe Tankships, Inc.
         10.119#         -- Seventh Supply Agreement for Excess Sales (Additional
                            Fixed Quantities Under Badak LNG Sales Contract as a
                            Result of Contract Amendment and Restatement) between
                            Pertamina and Virginia Indonesia Company, Opicoil
                            Houston, Inc., Ultramar Indonesia Limited, Union Texas
                            East Kalimantan Limited, Universe Gas & Oil Company, Inc.
                            and Virginia International Company, effective as of
                            January 1, 1990
         21.1#           -- List of Subsidiaries
         23.1            -- Consent of Price Waterhouse LLP is included on page S-1
                            of this Annual Report on Form 10-K
         24.1            -- Power of Attorney, pursuant to which amendments to this
                            Annual Report on Form 10-K may be filed, is included on
                            page 82 of this Annual Report on Form 10-K
         27.1#           -- Financial data schedule
</TABLE>
 
- ---------------
 
+ Executive Severance Plan or Arrangement pursuant to Item 601(b)(10)(iii)(A) of
  Regulation S-K.
 
# Filed herewith.

<PAGE>   1





                                     BYLAWS

                                       OF

                      UNION TEXAS PETROLEUM HOLDINGS, INC.





as of December 19, 1997
<PAGE>   2
                                     BYLAWS

                                       OF

                      UNION TEXAS PETROLEUM HOLDINGS, INC.



                                   ARTICLE I

                                   OFFICES

                 SECTION 1.  The registered office shall be in the City of
Wilmington, County of New Castle, State of Delaware.


                 SECTION 2.  The Corporation may also have offices at such
other places, both within and without the State of Delaware, as the board of
directors may from time to time determine or the business of the Corporation
may require.
                                   ARTICLE II

                            MEETINGS OF STOCKHOLDERS

                 SECTION 1.  All meetings of the stockholders for the election
of directors shall be held in the City of HOUSTON, State of TEXAS, at such
place as may be fixed from time to time by the board of directors and stated in
the notice of the meeting.  Meetings of the stockholders for any other purpose
may be held at such time and place, within or without the State of Delaware, as
shall be stated in the notice of the meeting or in a duly executed waiver of
notice thereof.

                 SECTION 2.  Annual meetings of stockholders shall be held on
the third Tuesday of May if not a legal holiday, and if a legal holiday, then
on the next secular day following, at 3:00 p.m., or at such other date and time
as shall be designated by the board of directors and stated in the notice of
the meeting, at which they shall elect by a plurality vote a board of
directors, and transact such other business as may properly be brought before
the meeting.





                                       2
<PAGE>   3
                 SECTION 3.  Subject to the provisions of Article IV, written
notice of the annual meeting stating the place, date and hour of the meeting
shall be given to each stockholder entitled to vote thereat at least ten days
before the date of the meeting.

                 SECTION 4.  Special meetings of the stockholders, for any
purpose or purposes, unless otherwise prescribed by statute or by the
certificate of incorporation, may be called by the Chairman or by the Chief
Executive Officer and shall be called by the Chairman, Chief Executive Officer,
or Secretary at the request in writing by any two directors.  Such request
shall state the purpose or purposes of the proposed meeting.

                 SECTION 5.  Written notice of a special meeting of
stockholders stating the time, place and purpose or purposes thereof shall be
given to each stockholder entitled to vote thereat at least ten days and not
more than sixty (60) days before the date fixed for the meeting.

                 SECTION 6.  The Chairman, at any meeting of stockholders,
shall determine the order of business and the procedure at the meeting,
including such regulation of the manner of voting and the conduct of discussion
as seem to the Chairman in order.  The date and time of the opening and closing
of the polls for each matter upon which the stockholders will vote at the
meeting shall be announced at the meeting.

                 SECTION 7.  The holders of at least a majority of the shares
issued and outstanding and entitled to vote thereat, present in person or
represented by proxy, shall constitute a quorum at all meetings of stockholders
for the transaction of business, except as otherwise provided by law or by the
certificate of incorporation.  If, however, such quorum shall not be present or
represented at any meeting of the stockholders, the Chairman or the
stockholders entitled to vote thereat, present in person or represented by
proxy, shall have the power to adjourn the meeting from time to time, without
notice other than announcement at the meeting unless the adjournment is for
more than thirty





                                       3
<PAGE>   4
(30) days or if after the adjournment a new record date is fixed for the
adjourned meeting, until a quorum shall be present or represented.  A holder of
a share shall be treated as being present at a meeting if the holder of such
share is (i) present in person at the meeting or (ii) represented at the
meeting by a valid proxy, whether the instrument granting such proxy is marked
as casting a vote or abstaining, is left blank or does not empower such proxy
to vote with respect to some or all matters to be voted upon at the meeting.

                 SECTION 8.  If a quorum exists, action on a matter (other than
the election of directors) shall be approved if the votes cast in favor of the
matter exceed the votes cast opposing the matter.  In determining the number of
votes cast, shares abstaining from voting or not voted on a matter will not be
treated as votes cast.  The provisions of this paragraph will govern with
respect to all votes of stockholders except as otherwise provided for in these
Bylaws or in the certificate of incorporation or by some specific statutory
provision superseding the provisions contained in these Bylaws or the
certificate of incorporation.

                 SECTION 9.  Each stockholder shall at every meeting of the
stockholders be entitled to one vote in person on or by proxy for each share of
the capital stock having voting power held by such stockholder, but no proxy
shall be voted on after three years from its date, unless the proxy provides
for a longer period.

                 SECTION 10.  Notice of Stockholder Business and Nominations

                 A.  Annual Meetings of Stockholders.

                     (1) Nominations of persons for election to the board of
directors and the proposal of business to be considered by the stockholders may
be made at an annual meeting of stockholders (a) pursuant to the Corporation's
notice of meeting, (b) by or at the direction of the board of directors or (c)
by any stockholder of the Corporation who was a stockholder of record at the
time of giving





                                       4
<PAGE>   5
of notice provided for in this Section 10, who is entitled to vote at the
meeting and who complies with the notice procedures set forth in this Section
10.

                     (2) For nominations or other business to be properly
brought before an annual meeting by a stockholder pursuant to clause (c) of
paragraph (A)(1) of this Section 10, the stockholder must have given timely
notice thereof in writing to the Secretary of the Corporation and such other
business must otherwise be a proper matter for stockholder action.  To be
timely, a stockholder's notice shall be delivered to the Secretary at the
principal executive offices of the Corporation not later than the close of
business on the sixtieth (60th) day nor earlier than the close of business on
the ninetieth (90th) day prior to the first anniversary of the preceding year's
annual meeting; provided, however, that in the event that the date of the
annual meeting is more than thirty (30) days before or more than sixty (60)
days after such anniversary date, notice by the stockholder to be timely must
be so delivered not earlier than the close of business on the ninetieth (90th)
day prior to such annual meeting and not later than the close of business on
the later of the sixtieth (60th) day prior to such annual meeting or the close
of business on the tenth (10th) day following the day on which public
announcement of the date of such meeting is first made by the Corporation.
Such stockholder's notice shall set forth (a) as to each person whom the
stockholder proposes to nominate for election or reelection as a director all
information relating to such person that is required to be disclosed in
solicitations of proxies for election of directors, or is otherwise required,
in each case pursuant to Regulation 14A under the Securities Exchange Act of
1934, as amended (the "Exchange Act") (including such person's written consent
to being named in the proxy statement as a nominee and to serving as a director
if elected); (b) as to any other business that the stockholder proposes to
bring before the meeting, a brief description of the business desired to be
brought before the meeting, the reasons for conducting such business at the
meeting and any material interest in such business





                                       5
<PAGE>   6
of such stockholder and the beneficial owner, if any, on whose behalf the
proposal is made; and (c) as to the stockholder giving the notice and the
beneficial owner, if any, on whose behalf the nomination or proposal is made
(i) the name and address of such stockholder, as they appear on the
Corporation's books, and of such beneficial owner and (ii) the class and number
of shares of the Corporation that are owned beneficially and held of record by
such stockholder and such beneficial owner.

                     (3) Notwithstanding anything in the second sentence of
paragraph (A)(2) of this Section 10 to the contrary, in the event that the
number of directors to be elected to the board of directors of the Corporation
is increased and there is no public announcement by the Corporation naming all
of the nominees for director or specifying the size of the increased board of
directors at least seventy (70) days prior to the first anniversary of the
preceding year's annual meeting (or, if the annual meeting is held more than
thirty (30) days before or sixty (60) days after such anniversary date, at
least seventy (70) days prior to such annual meeting), a stockholder's notice
required by this Section 10 shall also be considered timely, but only with
respect to nominees for any new positions created by such increase, if it shall
be delivered to the Secretary at the principal executive offices of the
Corporation not later than the close of business on the tenth (10th) day
following the day on which such public announcement is first made by the
Corporation.

                 B.  Special Meetings of Stockholders.

                     Only such business shall be conducted at a special meeting
of stockholders as shall have been brought before the meeting pursuant to the
Corporation's notice of meeting.  Nominations of persons for election to the
board of directors may be made at a special meeting of stockholders at which
directors are to be elected pursuant to the Corporation's notice of meeting (a)
by or at the direction of the board of directors or (b) provided that the board
of directors has determined that





                                       6
<PAGE>   7
directors shall be elected at such meeting, by any stockholder of the
Corporation who is a stockholder of record at the time of giving of notice of
the special meeting, who shall be entitled to vote at the meeting and who
complies with the notice procedures set forth in this Section 10.  In the event
the Corporation calls a special meeting of stockholders for the purpose of
electing one or more directors to the board of directors, any such stockholder
may nominate a person or persons (as the case may be), for election to such
position(s) as specified in the Corporation's notice of meeting, if the
stockholder's notice required by paragraph (A)(2) of this Section 10 shall be
delivered to the Secretary at the principal executive offices of the
Corporation not earlier than the ninetieth (90th) day prior to such special
meeting and not later than the close of business on the later of the sixtieth
(60th) day prior to such special meeting or the tenth (10th) day following the
day on which public announcement is first made of the date of the special
meeting and of the nominees proposed by the board of directors to be elected at
such meeting.

                 C.  General.

                     (1)  Only such persons who are nominated in accordance
with the procedures set forth in this Section 10 shall be eligible to serve as
directors and only such business shall be conducted at a meeting of
stockholders as shall have been brought before the meeting in accordance with
the procedures set forth in this Section 10.  Except as otherwise provided by
law or these Bylaws, the Chairman shall have the power and duty to determine
whether a nomination or any business proposed to be brought before the meeting
was made or proposed, as the case may be, in accordance with the procedures set
forth in this Section 10 and, if any proposed nomination or business is not in
compliance herewith to declare that such defective proposal or nomination shall
be disregarded.





                                       7
<PAGE>   8
                     (2)  For purposes of this Section 10, "public
announcement" shall mean disclosure in a press release reported by the Dow
Jones News Service, Associated Press or comparable national news service or in
a document publicly filed by the Corporation with the Securities and Exchange
Commission pursuant to Section 13, 14 or 15(d) of the Exchange Act.

                     (3)  Notwithstanding the foregoing provisions of this
Section 10, a stockholder shall also comply with all applicable requirements of
the Exchange Act and the rules and regulations thereunder with respect to the
matters set forth herein.  Nothing in this Section 10 shall be deemed to affect
any rights (i) of stockholders to request inclusion of proposals in the
Corporation's proxy statement pursuant to Rule 14a-8 under the Exchange Act or
(ii) of the holders of any series of Preferred Stock to elect directors under
specified circumstances.

                 SECTION 11.  In order that the Corporation may determine the
stockholders entitled to consent to corporate action in writing without a
meeting, the board of directors may fix a record date, which record date shall
not precede the date upon which the resolution fixing the record date is
adopted by the board of directors, and which date shall not be more than 10
days after the date upon which the resolution fixing the record date is adopted
by the board of directors.  Any stockholder of record seeking to have the
stockholders authorize or take corporate action by written consent shall, by
written notice to the Secretary, request the board of directors to fix a record
date.  The board of directors shall promptly, but in all events within 10 days
of the date on which such a request is received, adopt a resolution fixing the
record date.  If no record date has been fixed by the board of directors within
10 days of the date on which such a request is received, the record date for
determining stockholders entitled to consent to corporate action in writing
without a meeting, when no prior action by the board of directors is required
by applicable law, shall be the first date on which a signed written consent
setting forth the action taken or proposed to be taken is delivered to the





                                       8
<PAGE>   9
Corporation by delivery to its registered office in the State of Delaware, its
principal place of business, or any officer or agent of the Corporation having
custody of the book in which proceedings of meetings of stockholders are
recorded.  Delivery made to the Corporation's registered office shall be by
hand or by certified or registered mail, return receipt requested.  If no
record date has been fixed by the board of directors and prior action by the
board of directors is required by applicable law, the record date for
determining stockholders entitled to consent to corporate action in writing
without a meeting shall be at the close of business on the date on which the
board of directors adopts the resolution taking such prior action.

                                  ARTICLE III

                                   DIRECTORS

                 SECTION 1.  The number of directors which shall constitute the
whole board shall be twelve, except as otherwise provided by the certificate of
incorporation.  The directors shall be elected at the annual meeting of the
stockholders, except as provided in Section 2 of this Article or as otherwise
provided by the certificate of incorporation, and each director elected shall
hold office until his successor is elected and qualifies, except as otherwise
provided by the certificate of incorporation; provided, however, that unless
otherwise restricted by the certificate of incorporation or these Bylaws, any
director of the entire board of directors may be removed either with or without
cause, at any meeting of stockholders by vote of a majority of the stock
present and entitled to vote thereat.  Directors need not be stockholders.

                 SECTION 2.  Except as otherwise provided by the certificate of
incorporation, by law or by resolution of the board of directors, vacancies and
newly created directorships resulting from any increase in the authorized
number of directors shall be filled only by a majority of the directors then in
office, though less than a quorum, and not by the stockholders and the
directors so chosen





                                       9
<PAGE>   10
shall hold office until the next annual election and until their successors are
duly elected and shall qualify, unless sooner displaced.

                 SECTION 3.  The business of the Corporation shall be managed
under the direction of its board of directors which may exercise all such
powers of the Corporation and do all such lawful acts and things as are not by
statute or by the certificate of incorporation or by these Bylaws directed or
required to be exercised or done by the stockholders.

                       MEETINGS OF THE BOARD OF DIRECTORS

                 SECTION 4.  The board of directors of the Corporation may hold
meetings, both regular and special, either within or without the State of
Delaware.

                 SECTION 5.  The first meeting of each newly elected board of
directors shall be held as soon as practicable after the annual meeting of
stockholders and no notice of such meeting to the newly elected directors shall
be necessary in order legally to constitute the meeting, provided a quorum
shall be present.

                 SECTION 6.  Regular meetings of the board of directors may be
held without notice at such time and at such place as shall from time to time
be determined by resolution of the board of directors.

                 SECTION 7. Special meetings of the board may be held at any
time upon the call of the Chairman of the Board or the Chief Executive Officer
or by any director at such place, on such date, and at such time as he or she
shall fix.  Notice of the place, date and time of each such special meeting
shall be given each director by whom it is not waived by mailing written notice
not less than five (5) days before the meeting or by telegraphing or telexing
or by facsimile transmission or by oral notice of the same not less than
twenty-four hours before such meeting.  Oral notice shall be





                                       10
<PAGE>   11
confirmed in writing.  Unless otherwise indicated in the notice thereof, any
and all business may be transacted at a special meeting.

                 SECTION 8.  Except as may be otherwise specifically provided
by statute or by the certificate of incorporation, at all meetings of the board
six directors shall constitute a quorum for the transaction of business and the
approval of six of the directors present at any meeting shall be required for
action.  Any director not present for approval of any action shall not be
counted for purposes of determining whether a quorum is present with respect to
such matter, regardless of whether such director is present for approval of any
other matter.  If a quorum shall not be present at any meeting of the board of
directors, the directors present thereat may adjourn the meeting from time to
time, without notice other than announcement at the meeting, until a quorum
shall be present.

                 SECTION 9.  Unless otherwise restricted by the certificate of
incorporation or these Bylaws, any action required or permitted to be taken at
any meeting of the board of directors may be taken without a meeting if all
members of the board consent thereto in writing and the writing or writings are
filed with the minutes of proceedings of the board.

                                  RESIGNATIONS

                 SECTION 10.  Any director or officer of the Corporation may
resign at any time by giving written notice to the Chairman of the Board, the
Chief Executive Officer or the Vice President-Secretary of the Corporation.
Such resignation shall take effect at the time specified therein; and unless
otherwise specified therein, the acceptance of such resignation shall not be
necessary to make it effective.





                                       11
<PAGE>   12
                                 ARTICLE IV

                                   NOTICES

                 SECTION 1.  Notices to directors and stockholders shall be in
writing and delivered personally or mailed to the directors or stockholders at
their addresses appearing on the books of the Corporation.  Notice by mail
shall be deemed to be given at the time when the same shall be mailed.  Notice
to directors may also be given orally or by telegram, telecopy, telex or other
reasonable form of communication.

                 SECTION 2.  Whenever any notice is required to be given under
the provisions of the statutes or of the certificate of incorporation or of
these Bylaws, a waiver thereof in writing, signed by the person or persons
entitled to said notice, whether before or after the time stated therein, shall
be deemed equivalent thereto.

                                  ARTICLE V

                                  OFFICERS

                 SECTION 1.  The officers of the Corporation shall be chosen by
the board of directors and shall be a chairman of the board (if elected), a
chief executive officer, a vice president, a secretary, a controller and a
treasurer.  The board of directors may also choose additional vice presidents,
and one or more assistant secretaries and assistant treasurers or other
officers as deemed necessary.  Two or more offices may be held by the same
person.

                 SECTION 2.  The board of directors at its first meeting after
each annual meeting of stockholders may choose a chairman of the board from
among the directors, and shall choose a chief executive officer, one or more
vice presidents, a vice president-secretary and a treasurer, none of whom need
to be a member of the board.





                                       12
<PAGE>   13
                 SECTION 3.  The board of directors may appoint such other
officers and agents as it shall deem necessary who shall hold their offices for
such terms and shall exercise such powers and perform such duties as shall be
determined from time to time by the board.

                 SECTION 4.  The salaries of all officers and agents of the
Corporation may be fixed by the board of directors.

                 SECTION 5.  The officers of the Corporation shall hold office
until their successors are chosen and qualify.  Any officer elected or
appointed by the board of directors may be removed at any time, either with or
without cause, by the action of the board of directors.  Any vacancy occurring
in any office of the Corporation by death, resignation, removal or otherwise
shall be filled by the action of the board of directors.

                            CHAIRMAN OF THE BOARD

                 SECTION 6.  The Chairman of the Board, if one shall be elected
and if present, shall preside at all meetings of the board and of the
stockholders.  He shall have, to the extent designated by and under the control
of the board, general supervision and direction of the business and affairs of
the Corporation.  He shall at all times see that all resolutions or
determinations of the board are carried into effect.  He shall perform the
duties incident to the office of the Chairman of the Board and all such other
duties as are specified in these Bylaws or as shall be assigned to him from
time to time by the board.

                           CHIEF EXECUTIVE OFFICER

                 SECTION 7.  The Chief Executive Officer shall perform such
duties as from time to time shall be assigned to him by the board.  He shall
also be the chief operating officer of the Corporation and shall, in
conjunction with any such duties of the Chairman, if any, generally supervise
and direct the business and affairs of the Corporation.  He may execute bonds,
mortgages





                                       13
<PAGE>   14
and other contracts requiring a seal, under the seal of the Corporation, and
any and all other contracts or obligations of the Corporation.

                             THE VICE PRESIDENTS

                 SECTION 8.  The Vice Presidents in the order of their
seniority, unless otherwise determined by the board of directors, shall, in the
absence or disability of the Chief Executive Officer, perform the duties and
exercise the powers of the Chief Executive Officer.  They shall perform such
other duties and have such other powers as the board of directors may from time
to time prescribe.  They may execute bonds, mortgages and other contracts
requiring a seal, under the seal of the Corporation, and any and all other
contracts or obligations of the Corporation.

                    THE SECRETARY AND ASSISTANT SECRETARIES

                 SECTION 9.  The Secretary or other person acting in that
capacity shall attend all meetings of the board of directors and all meetings
of the stockholders and record all the proceedings of the meetings of the
Corporation and of the board of directors in a book to be kept for that purpose
and shall perform like duties for the standing committees when required.  He
shall give, or cause to be given, notice of all meetings of the stockholders
and special meetings of the board of directors, and shall perform such other
duties as may be prescribed by the board of directors, the Chairman of the
Board (if any), or the Chief Executive Officer, under whose supervision he
shall be.  He shall keep in safe custody the seal of the Corporation, affix the
same to any instrument requiring it and, when so affixed, such instrument may
be attested by his signature or by the signature of the Treasurer or an
assistant secretary.

                 SECTION 10.  The Assistant Secretaries in the order of their
seniority, unless otherwise determined by the board of directors, shall, in the
absence or disability of the Secretary, perform the





                                       14
<PAGE>   15
duties and exercise the powers of the Secretary.  They shall perform such other
duties and have such other powers as the board of directors may from time to
time prescribe.

           THE TREASURER, THE CONTROLLER AND ASSISTANT TREASURERS

                 SECTION 11.  The Treasurer shall have the custody of the
corporate funds and securities and shall keep full and accurate accounts of
receipts and disbursements in books belonging to the Corporation and shall
deposit all monies and other valuable effects in the name and to the credit of
the Corporation in such depositories as may be designated by the board of
directors.

                 SECTION 12.  He shall disburse the funds of the Corporation to
be ordered by the board of directors, taking proper orders for such
disbursements, and shall render to the Chairman of the Board, if any, the
President and the board of directors, at its regular meetings, or when the
board of directors so requires, an account of all his transactions as Treasurer
and of the financial condition of the Corporation.

                 SECTION 13.  If required by the board of directors, he shall
give the Corporation a bond (which shall be renewed every six years) in such
sum and with such surety or sureties as shall be satisfactory to the board of
directors for the faithful performance of the duties of his office and for the
restoration to the Corporation, in case of his death, resignation, retirement
or removal from office, of all books, papers, vouchers, money and other
property of whatever kind in his possession or under his control belonging to
the Corporation.

                 SECTION 14.  The Controller and the Assistant Treasurers in
the order of their seniority, unless otherwise determined by the board of
directors, shall, in the absence or disability of the Treasurer, perform the
duties and exercise the powers of the Treasurer.  They shall perform such other
duties and have such other powers as the board of directors may from time to
time prescribe.





                                       15
<PAGE>   16
                                 ARTICLE VI

                               INDEMNIFICATION

                 SECTION 1.(a)  The Corporation shall indemnify, in the manner
and to the full extent authorized by law (as now in effect or later amended),
any person who was or is a witness in or a party to, or who is threatened to be
made a party to, any action, suit or proceeding, whether criminal, civil,
administrative or investigative, by reason, in whole or in part, of the fact
that such person or such person's spouse is or was a director or officer of the
Corporation or any predecessor of the Corporation or serves or served in any
other corporation or enterprise as director, officer, employee or agent at the
request of the Corporation or any predecessor of the Corporation.

                 (b)  Without limitation of subsection (a) above, the
Corporation shall indemnify any person who was or is a witness, a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of the Corporation or any predecessor
of the Corporation) by reason of the fact that such person is or was, at any
time prior to or during which this Article VI is in effect, a director or
officer of the Corporation or any predecessor of the Corporation, or is or was,
at any time prior to or during which this Article VI is in effect, serving at
the request of the Corporation or any predecessor of the Corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust, other enterprise or employee benefit plan against reasonable
expenses (including attorneys' fees), judgments, fines, penalties, amounts paid
in settlement and other liabilities actually and reasonably incurred by such
person in connection with such action, suit or proceeding if such person acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the Corporation or any predecessor of the Corporation,
and, with respect to any criminal action or proceeding, had no reasonable cause
to believe that his conduct was





                                       16
<PAGE>   17
unlawful.  The termination of any action, suit or proceeding by judgment,
order, settlement, conviction or upon a plea of nolo contendere or its
equivalent, shall not, of itself, create a presumption that such person did not
act in good faith and in a manner which he reasonably believed to be in or not
opposed to the best interests of the Corporation or any predecessor of the
Corporation, and, with respect to any criminal action or proceeding, had
reasonable cause to believe that his conduct was unlawful.

                 (c)  Without limitation of subsection (a) above, the
Corporation shall indemnify any person who was or is a witness, a party or is
threatened to be made a party to any threatened, pending or completed action or
suit by or in the right of the Corporation or any predecessor of the
Corporation to procure a judgment in its favor by reason of the fact that such
person is or was, at any time prior to or during which this Article VI is in
effect, a director or officer of the Corporation or any predecessor of the
Corporation, or is or was, at any time prior to or during which this Article VI
is in effect, serving at the request of the Corporation or any predecessor of
the Corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise against
reasonable expenses (including attorneys' fees) and amounts paid in settlement,
actually and reasonably incurred by such person in connection with the defense
or settlement of such action or suit if such person acted in good faith and in
a manner he reasonably believed to be in or not opposed to the best interests
of the Corporation, and, with respect to the amounts paid in settlement, the
settlement is determined to be in the best interests of the Corporation;
provided that no indemnification shall be made under this subsection (c) in
respect of any claim, issue or matter as to which such person shall have been
adjudged to be liable to the Corporation unless and only to the extent that the
Delaware Court of Chancery, or other court of appropriate jurisdiction, shall
determine upon application that, despite the adjudication of liability but in
view of all the





                                       17
<PAGE>   18
circumstances of the case, such person is fairly and reasonably entitled to
indemnity of such expenses which the Delaware Court of Chancery, or other court
of appropriate jurisdiction, shall deem proper.

                 (d)  Any indemnification under subsections (b) or (c) of this
Section 1 (unless ordered by the Delaware Court of Chancery or other court of
appropriate jurisdiction) shall be made by the Corporation only as authorized
in the specific case upon a determination that indemnification of such person
is proper in the circumstances because he has met the applicable standard of
conduct set forth in subsections (b) and (c) of this Section 1.  Such
determination shall be made (1) by a majority vote of the directors who are not
parties to such action, suit or proceeding, even though less than a quorum; or
(2) if there are no such directors, or, if such directors so direct, by
independent legal counsel, selected by the board of directors; or (3) by the
stockholders.  In the event a determination is made under this subsection (d)
that the director or officer has met the applicable standard of conduct as to
some matters but not as to others, amounts to be indemnified may be reasonably
prorated.

                 (e)  In addition to and without limitation of subsections (b)
or (c) of this Section 1, expenses incurred by a person or spouse of a person
who is or was a director or officer of the Corporation or any predecessor of
the Corporation, in appearing at, participating in or defending any threatened,
pending or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative, shall be paid by the Corporation at reasonable
intervals in advance of the final disposition of such action, suit or
proceeding; provided, however, that if the Delaware General Corporation Law
requires, an advancement of expenses incurred by a person in his capacity as a
director or officer (and not in any other capacity in which service was or is
rendered by such person) shall be made only upon receipt of an undertaking by
or on behalf of such person to repay such





                                       18
<PAGE>   19
amount if it shall ultimately be determined that he is not entitled to be
indemnified by the Corporation as authorized by this Article VI.

                 (f)  If a claim under this Article VI is not paid in full by
the Corporation within ninety (90) days after a written claim has been received
by the Corporation, the claimant may at any time thereafter bring suit against
the Corporation to recover the unpaid amount of the claim and, if successful in
whole or in part, the claimant shall be entitled to be paid also the expense of
prosecuting such claim.  It shall be a defense to any such action (other than
an action brought to enforce a claim for expenses incurred in defending any
proceeding in advance of its final disposition where the required undertaking,
if any is required, has been tendered to the Corporation) that the claimant has
not met the standards of conduct which make it permissible under the Delaware
General Corporation Law for the Corporation to indemnify the claimant for the
amount claimed, but the burden of proving such defense shall be on the
Corporation.  Neither the failure of the Corporation (including its board of
directors, independent legal counsel or its stockholders) to have made a
determination prior to the commencement of such action that indemnification of
the claimant is proper in the circumstances because he has met the applicable
standard of conduct set forth in the Delaware General Corporation Law, nor an
actual determination by the Corporation (including its board of directors,
independent legal counsel or its stockholders) that the claimant has not met
such applicable standard of conduct, shall be a defense to the action or create
a presumption that the claimant has not met the applicable standard of conduct.

                 (g)  It is the intention of the Corporation to indemnify the
persons referred to in this Article VI to the fullest extent permitted by law
(as now in effect or later amended) and with respect to any action, suit or
proceeding arising from events which occur at any time prior to or during which
this Article VI is in effect.  The indemnification and advancement of expenses
provided by this





                                       19
<PAGE>   20
Article VI shall not be deemed exclusive of any other rights to which those
seeking indemnification or advancement of expenses may be or become entitled
under any law, the certificate of incorporation, agreement, vote of
stockholders or disinterested directors or otherwise, or under any policy or
policies of insurance purchased and maintained by the Corporation on behalf of
any such person, both as to action in his official capacity (if any) and as to
action in another capacity while holding such office, and shall inure to the
benefit of his heirs, legal representatives and assigns.  The provisions of
this Article VI are contract rights which (i) are for the benefit of, and may
be enforced by, the persons entitled thereto the same as if set forth in their
entirety in a written instrument duly executed and delivered by the Corporation
and each such person and (ii) constitute a continuing offer to all present and
future directors or officers of the Corporation.  The Corporation, by its
adoption of these Bylaws, (i) acknowledges and agrees that each present and
future director or officer of the Corporation has relied upon and will continue
to rely upon the provisions of this Article VI in becoming, and serving as, a
director or officer of the Corporation or, if requested by the Corporation, a
director, officer, employee, agent, trustee or the like of another corporation
or other enterprise, (ii) waives reliance upon, and all notices of acceptance
of, such provisions by such directors or officers and (iii) acknowledges and
agrees that no person entitled to indemnification hereunder shall be prejudiced
in his right to enforce the provisions of this Article VI in accordance with
their terms by any act or failure to act on the part of the Corporation.  No
amendment, modification or repeal of this Article VI or any provisions hereof
shall in any manner terminate, reduce or impair the right of any person
entitled to indemnification hereunder to be indemnified or advanced expenses by
the Corporation, nor the obligation of the Corporation to indemnify or advance
expenses to any such person under and in accordance with the provisions of this
Article VI as in effect immediately prior to such amendment, modification or
repeal with respect to claims arising from or relating to matters





                                       20
<PAGE>   21
occurring, in whole or in part, prior to such amendment, modification or
repeal, regardless of when such claim may arise or be asserted.  The provisions
of this Article VI shall be binding upon the Corporation and its successors and
assigns and shall inure to the benefit of each person entitled to
indemnification hereunder and his or her heirs, legal representatives and
assigns.

                 (h)  The indemnification provided by this Article VI shall be
subject to all valid and applicable laws, and, in the event this Article VI or
any of the provisions hereof or the indemnification contemplated hereby are
found to be inconsistent with or contrary to any such valid laws, the latter
shall be deemed to control, and this Article VI shall be regarded as modified
so that this Article and the indemnification provided for herein shall be valid
and enforceable to the greatest extent permitted by applicable laws, and, as so
modified, this Article VI shall continue in full force and effect.

                                  ARTICLE VII

                             CERTIFICATES OF STOCK

                 SECTION 1.  Every holder of stock in the Corporation shall be
entitled to have a certificate, signed by (or bearing such a facsimile
signature) or in the name of the Corporation, by the Chairman, Chief Executive
Officer or the Vice President, the Treasurer, or an Assistant Treasurer, or the
Secretary or an Assistant Secretary of the Corporation, certifying the number
of shares owned by him in the Corporation.

                               LOST CERTIFICATES

                 SECTION 2.  The board of directors may direct a new
certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the Corporation alleged to have been lost or
destroyed, upon the making of an affidavit of that fact by the person claiming
the certificate of stock to be lost or destroyed.  When authorizing such issue
of a new certificate or





                                       21
<PAGE>   22
certificates, the board of directors may, in its discretion and as a condition
precedent to the issuance thereof, require the owner of such lost or destroyed
certificate or certificates, or his legal representative, to advertise the same
in such manner as it shall require and/or give the Corporation a bond in such
sum as it may direct as indemnity against any claims that may be made against
the Corporation with respect to the certificate alleged to have been lost or
destroyed.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

                                   DIVIDENDS

                 SECTION 1.  Dividends upon the capital stock of the
Corporation, if any, may be declared by the board of directors at any regular
or special meeting, pursuant to law.  Dividends may be paid in cash, in
property or in shares of the capital stock, subject to the provisions of the
certificate of incorporation.

                 SECTION 2.  Before payment of any dividend, there may be set
aside out of any funds of the Corporation available for dividends such sum or
sums as the directors from time to time, in their absolute discretion, think
proper as a reserve or reserves to meet contingencies, or for equalizing
dividends, or for repairing or maintaining any property of the Corporation, or
for such other purpose as the directors shall think conducive to the interest
of the Corporation, and the directors may modify or abolish any such reserve in
the manner in which it was created.

                                     CHECKS

                 SECTION 3.  The persons from time to time holding the position
of Chairman of the Board (if any), Chief Executive Officer, Vice President,
Vice President-Secretary, Treasurer or Controller, of the Corporation, acting
by written instrument signed by any two of them are hereby authorized:  (1) to
open or close any bank account of the Corporation; (2) to designate the use of
any





                                       22
<PAGE>   23
such account; (3) to grant authority to any person or combination of persons to
sign checks, by manual or facsimile signature, or issue instructions for
withdrawal of funds from any account maintained by the Corporation; (4) to
revoke the authority of any person or persons to sign checks or to issue
instructions; (5) to establish a maximum amount as to which any person or
combination of persons shall be authorized to sign checks or issue
instructions; and (6) to take all such further actions, and to execute and
deliver all such further instruments and documents, in the name and on behalf
of the Corporation, as in their judgment shall be necessary, proper or
advisable.

                                  FISCAL YEAR

                 SECTION 4.  The fiscal year of the Corporation shall be fixed
by resolution of the board of directors.

                                      SEAL

                 SECTION 5.  The corporate seal shall have inscribed thereon
the name of the Corporation and words "Corporate Seal, Delaware".  The seal may
be used by causing it or a facsimile thereof to be impressed or affixed or
reproduced or otherwise.

                                   ARTICLE IX

                                   AMENDMENTS

                 SECTION 1.  These Bylaws may be altered, amended or repealed
or new bylaws may be adopted by the stockholders or by the board of directors.





                                       23

<PAGE>   1




                                   CONFORMED


                                WORKING COPY OF




                      UNION TEXAS PETROLEUM HOLDINGS, INC.

                            EXECUTIVE SEVERANCE PLAN



                       AS AMENDED THROUGH NINTH AMENDMENT
                          EFFECTIVE  SEPTEMBER 5, 1997
<PAGE>   2
Article I -- Purpose

         This Plan has been created to provide severance benefits to the
         designated officers and key employees of UTP in the event of the
         termination of their employment in conjunction with a Change of
         Control.

Article II -- Definitions

2.01     Allied - means Allied Corporation, a New York corporation.

2.02     Annual Incentive Compensation - means the lesser of (i) the last
         average percentage incentive compensation award for employees in the
         same salary grade, or (ii) the Participant's average percentage
         incentive compensation award in the last three incentive periods prior
         to the date of the event giving rise to salary and benefit
         continuation pursuant to Article IV of the Plan (or such lesser period
         as the Participant may have been employed prior to such date) times
         (iii) Base Salary.  In determining such average percentages, annual
         incentive compensation awards by Allied or its subsidiaries shall be
         considered with respect to any period prior to the transaction
         described in the second paragraph of Section 2.04 hereof.
         Notwithstanding the foregoing, Annual Incentive Compensation with
         respect to a Participant to whom salary and benefit continuation is
         applicable following a Change of Control other than the transaction
         described in the second paragraph of Section 2.04 hereof shall mean
         the greater of (i) the Participant's target percentage incentive
         compensation award in effect immediately prior to such Change of
         Control, or (ii) the Participant's target percentage incentive
         compensation award in effect immediately prior to the date of the
         event giving rise to such salary and benefit continuation times (iii)
         Base Salary; provided, however, that if a Change of Control occurs
         after September 5, 1997, then solely for purposes of determining the
         amount of any payment of Annual Incentive Compensation with respect to
         any such Participant that is to be made in accordance with this Plan
         in January of the year following the Change of Control, Annual
         Incentive Compensation shall not be less than the incentive
         compensation award that would be applicable to such Participant for
         the year in which a Change of Control occurs with such award being
         determined at the time of the Change of Control and based upon the
         levels of objectives achieved by the Company at the time of the Change
         of Control.

2.03     Base Salary - means the annual salary of a Participant on the
         Effective Date of the Plan or such higher annual amount that may
         result from approved salary increases (without giving effect to salary
         decreases, if any) following the Effective Date but prior to the date
         of the event giving rise to salary and benefit continuation pursuant
         to Article IV of the Plan.

 2.04    Change of Control - means the sale of the majority of the stock or
         business assets of UTP; or one or more of the principal subsidiaries
         of UTP.





                                      -1-
<PAGE>   3
         Specifically, Change of Control shall also include the closing of the
         transaction described in that Stock Acquisition Agreement dated April
         19, 1985, pursuant to which Petroleum Associates, L.P., a limited
         partnership of which Kohlberg Kravis Roberts & Co. or its affiliate is
         a general partner, directly or indirectly acquires an equity interest
         in UTP.

         Change of Control shall also include a change of ownership not
         described in the immediately preceding paragraph of this Section 2.04
         that results in a significant reorganization of UTP within ninety (90)
         days of the change of ownership.  Further, the Change of Control
         described in this paragraph shall be deemed to have occurred only for
         those Participants whose employment is not continued as a direct
         result of the reorganization.

2.05     Code - means the Internal Revenue Code of 1986, as amended from time
         to time.

2.06     Effective Date - means March 1, 1985.

2.07     Gross Cause - means fraud, misappropriation of company property or
         intentional misconduct damaging to such property or business of UTP,
         or the commission of a crime.

2.08     Participant - means an employee of UTP listed in Appendix A, and any
         other officer or key employee of UTP who has been designated as a
         Participant in the Plan by action of the Board of Directors of UTP.

2.09     Plan - means the Union Texas Petroleum Holdings, Inc. Executive
         Severance Plan.

2.10     Plan Administrator - means the individual or committee designated by
         the Board of Directors of UTP to administer the terms and conditions
         of the Plan.

2.11     Plan Sponsor - means UTP.  In the event of a Change of Control, any
         successor to UTP (or a principal subsidiary) shall become a Plan
         Sponsor.

2.12     Protected Period - means each of any of the following periods:

         (i)     the period ending March 31, 1999; and

         (ii)    the period beginning with the date of any Change of Control
                 that occurs after March 31, 1991 and ending twenty-four (24)
                 months after the date of such Change of Control."

2.13     UTP - means Union Texas Petroleum Holdings, Inc.  Its principal
         subsidiaries are Union Texas Petroleum Corporation, Union Texas
         Products Corporation, and Union Texas Properties Corporation.  Texgas
         Corporation is not a principal subsidiary.





                                      -2-
<PAGE>   4
Article III -- Participation

         Employees listed in Appendix A shall be Participants in the Plan.
         Prior to a Change of Control, any other employee who is either an
         officer of UTP, is in salary grade 17 and above, or reports directly
         to the Chairman of the Board and Chief Executive Officer of UTP may be
         designated as a Participant in the Plan by the Board of Directors of
         UTP.  The benefits provided under the Plan are limited solely to
         Participants.

Article IV -- Benefits

4.01     Eligibility for Salary and Benefit Continuation

         In the event of a Change of Control, salary and benefit continuation
         shall be provided to Participants who have not voluntarily terminated
         their employment prior to, coincident with or following such Change of
         Control, if:

         A)      A Participant is not offered continued employment by UTP or a
                 successor coincident with the Change of Control; or

         B)      A Participant accepting or continuing employment with UTP or a
                 successor following a Change of Control is terminated, other
                 than for Gross Cause, within the Protected Period.  For
                 purposes of this paragraph B, if at any time during the
                 Protected Period a Participant is offered continued employment
                 (1) at less than one hundred percent (100%) of Base Salary and
                 comparable target incentive opportunity (comparable to that
                 applicable to him immediately prior to such offer of continued
                 employment), other than any such offer that is made pursuant
                 to a program of compensation reduction that is generally and
                 similarly applicable to substantially all of the management
                 employees of UTP and that is made due to material financial
                 hardship of UTP, as reasonably determined by the Board of
                 Directors of UTP, or (2) at a location which is in excess of
                 thirty (30) miles from the Participant's current work site,
                 and such Participant refuses such offer of continued
                 employment or relocation, such Participant shall be deemed to
                 have been terminated (involuntarily), other than for Gross
                 Cause.

         Notwithstanding the foregoing, in the event of the sale of any
         facility, line of business or subsidiary of UTP or its subsidiaries or
         spinoff of a subsidiary of UTP or its subsidiaries at any time
         (whether before or after a Change of Control and without regard to
         whether such sale or spinoff does nor does not constitute a Change of
         Control), a Participant who receives a Comparable Offer of Employment
         (as hereinafter defined) with the purchaser (or its affiliates) of
         such facility, line of business or subsidiary or with such spinoff
         subsidiary or who accepts employment (without regard to the terms of
         such employment) with the purchaser (or its affiliates) of such
         facility, line of business or subsidiary or with such spinoff
         subsidiary in connection with the sale or spinoff shall not be
         considered to have been





                                      -3-
<PAGE>   5

         involuntarily terminated, and salary and benefit continuation shall
         not be provided to such Participant.  A "Comparable Offer of
         Employment" is an offer of employment which provides for (1) at least
         100% of Base Salary, (2) comparable target incentive opportunity
         (comparable to that applicable to the Participant immediately prior to
         such offer of employment), (3) a work site location not in excess of
         thirty miles from the Participant's current work site, and (4)
         protection under a severance program of the purchaser or spinoff
         subsidiary to the effect that if a Participant is involuntarily
         terminated other than for gross cause within twelve months after the
         date of sale or spinoff, such Participant shall be entitled to salary
         and incentive compensation continuation in the amounts and for the
         length of time to which such Participant would have been entitled
         under this Plan if he had been involuntarily terminated, other than
         for Gross Cause, on the day before the sale or spinoff.  In the event
         of the sale of any facility, line of business or subsidiary of UTP or
         its subsidiaries or spinoff of a subsidiary of UTP or its subsidiaries
         at any time (whether before or after a Change of Control and without
         regard to whether such sale or spinoff does or does not constitute a
         Change of Control), a Participant who is employed by UTP or its
         subsidiaries or successor at the closing of the sale or spinoff, who
         does not accept employment with the purchaser (or its affiliates) of
         such facility, line of business or subsidiary or with such spinoff
         subsidiary in connection with the sale or spinoff, and who
         subsequently accepts employment (without regard to the terms of such
         employment) with such purchaser (or its affiliates) or spinoff
         subsidiary within six months after the closing of the sale or spinoff
         shall not be eligible to receive any salary and benefit continuation
         from and after the date such Participant begins employment with such
         purchaser or its affiliates or such spinoff subsidiary (whether or not
         such Participant had previously become entitled to salary and benefit
         continuation pursuant to the Plan on or after such closing).  If such
         Participant has become entitled to and been paid a lump sum payment
         for salary continuation pursuant to the Plan, such Participant shall
         be obligated to repay to UTP or its successor a portion of such lump
         sum payment equal to the amount of the lump sum payment multiplied by
         a fraction, the numerator of which is the remaining months left in the
         salary continuation period for which the lump sum payment was made and
         the denominator of which is the total number of months in the salary
         continuation period for which the lump sum payment was made.

4.02     Salary and Benefit Continuation

         A)      Salary Continuation - A Participant shall receive Base Salary,
                 paid monthly, and an Annual Incentive Compensation, paid
                 annually, for a period not less than twenty-four (24) nor
                 greater than thirty-six (36) months, as specified in Appendix
                 A or by the Board of Directors of UTP at the time the officer
                 or key employee is designated as a Participant; provided,
                 however, in the event of a Change of Control that occurs after
                 September 5, 1997, a Participant shall receive Base Salary,
                 paid monthly, and an Annual Incentive Compensation, paid
                 annually, for a period of thirty-six (36) months.  In this
                 connection, Annual Incentive Compensation shall be paid during
                 each January that occurs after a Participant's termination and
                 before the end of the period of Salary Continuation, and a
                 final payment with respect to such Annual Incentive
                 Compensation shall be made in the January next following the
                 end of the period of Salary Continuation, which final payment
                 shall be a fraction of the Annual





                                      -4-
<PAGE>   6
                 Incentive Compensation, the numerator of which is the number
                 of months between the beginning of the calendar year in which
                 ends the period of Salary Continuation and the end of the
                 period of Salary Continuation and the denominator of which is
                 twelve.

         B)      Benefit Continuation - For the period of Salary Continuation,
                 UTP or its successor will continue the Participant's basic
                 life and medical insurance (including qualified dependents),
                 at the active employee coverage level and prevailing employee
                 contribution rate, if any.  Provided, however, that such level
                 of continued benefits shall not exceed the level of benefits
                 in effect on the date of the event giving rise to such Benefit
                 Continuation, and that such continued insurance coverage will
                 cease on the date similar coverage is provided the Participant
                 by a subsequent employer.

         C)      Pension Service Continuation - Under the terms of the
                 qualified pension plan covering Participant, the months of
                 Salary Continuation for such Participant shall be recognized
                 or if not permissible under such qualified pension plan
                 comparable service shall be recognized under a non-qualified
                 plan covering Participant.

         D)      Savings Plan Match - In the event of a Change of Control that
                 occurs after September 5, 1997, a participant shall receive an
                 amount equal to 24% of his Base Salary paid in a lump sum
                 within thirty days following the termination of employment
                 that entitles a Participant to benefits under the Plan.

         E)      Outplacement Services - A Participant who becomes entitled to
                 benefits under the Plan shall be entitled to receive Executive
                 Outplacement Services in accordance with the Company's past
                 practice for such outplacement services.

         F)      Tax Gross-Up - If it shall be determined that any payment to
                 or for the benefit of a Participant pursuant to Sections
                 4.02(A) - (E) of the Plan or under any other plan or program
                 of the Company (collectively, the "payments") would be subject
                 to the excise tax imposed by Section 4999 of the Code (or any
                 successor provision) or any interest or penalties are incurred
                 by a Participant with respect to such excise tax (such excise
                 tax together with any such interest and penalties, the "Excise
                 Tax"), such Participant shall receive an additional lump such
                 cash payment (a "Gross-Up Payment") such that after payment by
                 the Participant of all taxes (including any interest or
                 penalties imposed with respect to such taxes), including,
                 without limitation, any income taxes (and any interest and
                 penalties imposed with respect thereto) and  Excise Tax
                 imposed upon the Gross-Up Payment, Participant will retain an
                 amount of the Gross-Up Payment equal to the Excise Tax on the
                 payments.





                                      -5-
<PAGE>   7
4.03     Benefit Limitations - Except as provided in other plans, the amount of
         any similar benefits under other severance plans sponsored by UTP for
         which the Participant may be eligible shall be offset and reduced by
         the amount provided the Participant under this Plan regardless of
         whether the payments under this Plan are made at a later date than
         payments under a similar plan would have been made.  Payments under
         this Plan shall not continue past the month in which the Participant
         attains age sixty-five (65).

4.04     Termination of Employment - Nothing contained in this Plan prohibits
         or restricts in any way the right of UTP or any Participant to
         terminate or refuse employment at any time for any reason whatsoever,
         with or without cause.

4.05     Special Provisions for a Change of Control After July 25, 1991 - In
         the event of a Change of Control that occurs after July 25, 1991, the
         following special provisions shall be applicable (and, specifically,
         the second sentence of Section 4.01(B) shall thereupon become
         inoperative and inapplicable).  References in this section to a Change
         of Control shall mean a Change of Control that occurs after July 25,
         1991 but shall not include the sale of a principal subsidiary of UTP
         unless the sale of such principal subsidiary constitutes the sale of a
         majority of the business assets of UTP.

         A)      A Participant who terminates employment after a Change of
                 Control and during the Protected Period for Good Reason as
                 hereinafter defined shall be deemed to be involuntarily
                 terminated, other than for Gross Cause.  "Good Reason" means
                 one or more of the following:

                 (1)      a material change in the Participant's duties,
                          authority or responsibilities as they existed
                          immediately preceding a Change of Control;

                 (2)      any Significant Reduction in Base Salary of the
                          Participant from that applicable immediately prior to
                          the Change of Control;

                 (3)      any Significant Reduction in annual incentive
                          compensation for the Participant from that applicable
                          immediately prior to the Change of Control;

                 (4)      any Significant Reduction in benefit coverage for the
                          Participant from that applicable under UTP's medical
                          plan for active employees immediately prior to the
                          Change of Control or any Significant Increase in
                          premiums to be paid by the Participant for such
                          benefits from those applicable immediately prior to
                          the Change of Control;

                 (5)      any Significant Reduction in the rate of UTP's
                          contribution to the Union Texas Petroleum Savings
                          Plan for Salaried Employees or benefit accruals under
                          the Union Texas Petroleum Salaried Employees' Pension
                          Plan from those applicable immediately prior to the
                          Change of Control;





                                      -6-
<PAGE>   8
                 (6)      any Significant Reduction in the benefit coverage
                          available to the Participant under the UTP long-term
                          disability plan or the UTP life insurance benefits
                          from those applicable immediately prior to the Change
                          of Control or any Significant Increase in premiums to
                          be paid by the Participant for such benefits from
                          those applicable immediately prior to the Change of
                          Control;

                 (7)      any geographic relocation of the Participant's work
                          site location to a new location in excess of thirty
                          miles from the location of the Participant's work
                          site location immediately prior to the Change of
                          Control;

                 (8)      any action by UTP or its subsidiaries that under
                          applicable law constitutes constructive discharge.

                 Notwithstanding the foregoing, during the ninety day period
                 beginning on the date of the Change of Control, a Participant
                 may not terminate employment for Good Reason based solely on a
                 circumstance described in (A)(1) above; however, a Participant
                 may terminate employment for Good Reason after such ninety day
                 period and during the Protected Period based (solely or
                 otherwise) on a circumstance described in (A)(1) above that
                 occurred during such ninety day period.  For purposes of this
                 section, the term "Significant Reduction" shall mean a
                 reduction or series of reductions with respect to the same
                 form of benefit or remuneration which are greater than 10% or
                 which do not affect all persons covered by the plan or program
                 in question.  For purposes of this section, the term
                 "Significant Increase" shall mean an increase or a series of
                 increases in the Participant's percentage of total premiums
                 for a benefit which are greater than 10% or which do not
                 affect all persons covered by the plan or program in question.

         B)      The benefits which are determined to be payable to a
                 Participant pursuant to Section 4.02(A) on or after a Change
                 of Control shall be paid in a lump sum within thirty days
                 following the later of the Change of Control or a termination
                 of employment that entitles a Participant to benefits under
                 this Plan.  If a termination of employment which entitles a
                 Participant to receive benefits under this Plan occurred prior
                 to a Change of Control, the remaining benefits payable to a
                 Participant pursuant to Section 4.02(A) shall be commuted and
                 paid in a lump sum at the Change of Control.  It is
                 specifically provided that any lump sum payment described in
                 this Section 4.05(B) shall equal the total payments to be made
                 or remaining to be made to a Participant pursuant to Section
                 4.02(A) without any reduction for the acceleration of such
                 payments.  If a Participant becomes entitled to a lump sum
                 payment pursuant to this Section, such Participant shall
                 continue to be entitled to benefit continuation provided for
                 by Section 4.02(B) for the period that salary continuation
                 would have been paid pursuant to Section 4.02(A) if such lump
                 sum payment had not been made.





                                      -7-
<PAGE>   9
Article V - Administration

5.01     Plan Administrator - The Board of Directors of UTP shall name a Plan
         Administrator.  Such Plan Administrator shall serve at the convenience
         of the Board of Directors and shall serve without compensation.  The
         Plan Administrator shall keep such records as necessary for the proper
         administration of the Plan and shall report to the Board of Directors
         at such time or times as the Board of Directors shall designate.

5.02     Benefit Determination - The Plan Administrator shall determine the
         amount and timing of any benefit paid under the Plan.  The Plan
         Administrator shall rely on the records of UTP in determining any
         Participant's eligibility for and amount of benefit under the Plan.
         In the event that the Plan Administrator's reliance on the records of
         UTP causes a benefit to be over or under paid, the Plan Administrator
         shall adjust future payments to be increased or decreased as required.
         If such future payments are insufficient to recover any overpayment to
         a Participant, the Plan Administrator shall withhold any payments then
         due a Participant and take any action deemed appropriate to recover
         the balance of the overpayment.  In the event of the death of a
         Participant while payments to such Participant continue, the balance
         of payments will be made to the Participant's spouse or in the absence
         of a spouse, to the estate of the Participant.

5.03     Benefit Appeals - The Plan Administrator shall establish an appeals
         procedure as defined by U. S. Department of Labor regulations.  Such
         procedures will provide that the Participant has sixty (60) days upon
         receipt of any benefits or denial of benefits to file an appeal with
         the Plan Administrator.  The Plan Administrator must respond within
         sixty (60) days of receiving the appeal, in writing specifically
         identifying those Plan provisions on which the benefit denial was
         based and indicating what information the Participant must supply in
         order to perfect a claim for benefits.

5.04     Indemnification - If litigation shall be brought to enforce or
         interpret any provision of the Plan, UTP shall pay and indemnify the
         Participant against, to the fullest extent permitted by law, the
         Participant's reasonable attorney's fees and other disbursements
         incurred in such litigation (regardless of the outcome thereof).  This
         Section 5.04 shall be applicable only from and after a Change of
         Control other than the transaction described in the second paragraph
         of Section 2.04 hereof.

Article VI - Amendment and Termination

6.01     Plan Amendments - The Board of Directors of UTP reserves the right to
         amend the Plan from time to time.  However, no amendment shall reduce
         any benefit being paid or then payable to a Participant.





                                      -8-
<PAGE>   10
         In the event of a Change of Control, during the Protected Period no
         amendment to the Plan may be made if such amendment would reduce the
         benefits provided by the Plan or alter in any manner the rights of the
         Participants.

6.02     Plan Termination - The Board of Directors of UTP reserves the right to
         terminate the Plan.  However, no Plan termination shall be permitted
         within one hundred eighty (180) days preceding a Change of Control or
         during the Protected Period.

         Such termination shall not adversely affect the rights of Participants
         already receiving benefits under the Plan at the time of Plan
         termination.





                                      -9-
<PAGE>   11
                                   APPENDIX A
                                       TO
                            EXECUTIVE SEVERANCE PLAN

                             AS OF FEBRUARY 4, 1998


Whitmire, J. L. - Chairman and Chief Executive Officer (36 months)
Krips, W. M. - Senior Vice President (36 months)
Peabody, A. W. - Senior Vice President (36 months)
Crain, Jr., A. R. - Vice President and General Counsel (24 months)
Cunningham, R. A. - Regional Vice President (24 months)
Kalmbach, L. D. - Vice President and Chief Financial Officer (24 months)
Knight, J. E. - Regional Vice President (24 months)
Markowitz, M. N. - Vice President and Treasurer (24 months)
McMullan, D. M. - Vice President and Controller (24 months)
Pierce, R. W. - Vice President Exploration (24 months)
Wilson, III, N. W. - Regional Vice President (24 months)
Zimmerman, J. M. - Vice President Investor Relations (24 months)
Cox, C. L. - Director Corporate Communications (24 months)
Dimick, M. C. - Director Human Resources (24 months)
Frazier, R. J. - General Manager Petrochemical Field Operations (24 months)
Hoffman, A. G. - President Union Texas Pakistan (24 months)
Kennedy, J. E. - Managing Director UTPL (24 months)
Latch, C. W. - General Manager Union Texas Venezuela (24 months)
C. del Solar - President Union Texas Zulia, Inc. (24 months)

Change-In-Control

In the event of a change-in-control after September 5, 1997, the above named
participants shall be eligible for 36 months of salary continuation.





                                      -10-

<PAGE>   1
                                                                   BOQUERON AREA



[TRANSLATION]                           
                              OPERATING AGREEMENT
                                        
                              Dated July 29, 1997
                                        
                                    between
                                        
                                 LAGOVEN, S.A.
                                        
                                      and
                                        
                         UNION TEXAS VENEZUELA LIMITED
                                        
                                      and
                                        
                             PREUSSAG ENERGIE GMBH

                                        
                                    BOQUERON


LEGEND

* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.
<PAGE>   2
                                                                BOQUERON AREA

 

                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>   
                                                                                                       PAGE
                                                                                                       ----
<S>                                 <C>                                                                <C>
                                                                                                       

Clause I                            Definitions                                                           2
Clause II                           Object                                                               10    
Clause III                          Effectiveness; Guarantees; EPIC; Factor de Valorizacion              10
Clause IV                           Operating Services; Minimum Work Obligation                          13
Clause V                            Affiliate Approval Requirements                                      15             
Clause VI                           Development Plan                                                     17 
Clause VII                          Annual Work Programs and Budgets; AFEs                               19
Clause VIII                         Activities Outside Field Boundaries                                  22  
Clause IX                           Amendments to Development Plans                                      25        
Clause X                            The Operator                                                         27 
Clause XI                           Conduct of Operating Services                                        30   
Clause XII                          Title to and Use of Fixed Assets                                     38
Clause XIII                         Hydrocarbon Reservoirs Extending Outside the Area                    42   
Clause XIV                          Production Curtailment                                               43
Clause XV                           Title to and Transfer of Hydrocarbons; Royalties;                    44
                                    Transportation and Handling                      
Clause XVI                          Gas Disposition and Handling                                         46
Clause XVII                         Payment and Reimbursement                                            48
Clause XVIII                        Statements and Invoices                                              49   
Clause XIX                          Terms and Termination; Extensions                                    50    
Clause XX                           Default and Early Termination                                        52
Clause XXI                          Abandonment; Inactive Wells                                          54    
Clause XXII                         Environmental Matters                                                58
Clause XXIII                        Governing Law; Arbitration; Expert Opinion                           60
Clause XXIV                         Technology; Ownership of Information and Data; Access to             62   
                                    Facilities                                                              
Clause XXV                          Confidentiality                                                      63
Clause XXVI                         Force Majeure                                                        64
Clause XXVII                        Assignment; Change in Control                                        65   
Clause XXVIII                       Notices                                                              66    
Clause XXIX                         Miscellaneous                                                        68


Annex A                             Description of Area
Annex B                             Description of Initial Field
Annex C                             Accounting Procedures
Annex D                             Form of Contractor Guarantee
Annex E                             Development Plan Guidelines
Annex F                             Initial Contractor Participations
Annex G                             Form of Operator Accession Agreement
Annex H                             Delivery of Hydrocarbons
Annex I                             Baseline Production
Annex J                             Form of Operator Guarantee
Annex K                             Model Joint Operating Terms for EPIC 

</TABLE>
<PAGE>   3
                                                                   BOQUERON AREA


Annex L        Price Formula
Annex M        Form of Guarantee for Minimum Work Obligation
Annex M-2      Form of Financial Undertaking for Minimum Work Obligation
Annex N        Available Assets
Annex O        Form of Letter of Credit for Minimum Work Obligation
<PAGE>   4
                                                                   BOQUERON AREA




                              OPERATING AGREEMENT

Operating Agreement dated July 29th, 1997, between LAGOVEN, S.A., a sociedad
anonima organized on the date of December 18, 1975 before the First Mercantile
Registry of the Judicial District for the Federal District and the State of
Miranda, Republic of Venezuela, under Number 56, Book 116-A (together with its
successors and assigns, the "Affiliate"), represented by JULIUS TRINKUNAS;
acting in this act as President of the company and UNION TEXAS VENEZUELA
LIMITED, an international business company organized on the date of January 10,
1996 in the Commonwealth of the Bahamas, represented in this act by NEWTON W.
WILSON, III acting in his capacity as President, and PREUSSAG ENERGIE GmbH, a
limited liability company organized on the date of January 1, 1993 in Germany,
represented in this act by RUDOLPH BERENDS, acting in his capacity as attorney
in fact (together with their respective successors and assigns, the
"Contractors"):

                                    RECITALS

A.   All Hydrocarbons existing within the territory of Venezuela are a national
     resource owned and controlled by the Republic of Venezuela.

B.   The Affiliate has the exclusive right to carry on all operations with
     respect to the Hydrocarbons in the Area (as defined herein).

C.   The Affiliate wishes to promote the development of the Area, and the
     Contractors wish to render services within the Area.

D.   The Contractors have the financial capacity, technical ability and
     professional expertise necessary to perform the Operating Services
     described herein.

E.   The Contractors have agreed to perform for the Affiliate, but at the risk
     and cost of the Contractors, those rehabilitation, reactivation,
     development, production, exploration and other activities as are required
     to achieve the continuous commercial development of the Hydrocarbons
     located in the Area, as further specifically set forth herein and as to be
     set forth in the Development Plans and Annual Work Programs and Budgets
     approved by the Affiliate.

F.   The Parties have agreed that the payment to the Contractors for the
     services rendered hereunder shall only include such payment as is
     established in Clause XVII (and the direct reimbursement of certain
     specified expenses as provided elsewhere in this Agreement), and that the
     Contractors shall not have any title to the Hydrocarbons located or
     produced in the Area.

G.   The Parties have agreed that the rights of the Contractors derived herefrom
     do not include any right to the economic benefits resulting from the sale 
     or disposal by the Affiliate of the Hydrocarbons extracted for the Area, 
     but only those economic
<PAGE>   5
                                                                   BOQUERON AREA

     interests as may be granted to the Contractors hereunder in their
     capacities as contractors, for the Operating Services described herein.

NOW, THEREFORE, the Parties hereby agree on the following terms and conditions
to govern their Agreement:


                                       I

                                  DEFINITIONS

The following terms shall have the following meanings for purposes of this
Agreement:

"Accounting Procedures" shall mean the accounting procedures attached hereto as
Annex C, as amended or supplemented from time to time in accordance with this
Agreement.

"Accumulation" shall mean any group of Hydrocarbon-bearing reservoirs,
formations or deposits that would ordinarily be considered a single field in
accordance with International Oil Industry Standards; provided that, unless
otherwise agreed by the Affiliate in its discretion, no Hydrocarbon-bearing
reservoirs, formations or deposits lying at depths below the lower horizon of
the Field Boundary of the Initial Field will be deemed to constitute an
"Accumulation" with the Initial Field.

"AFE" shall mean an authorization for expenditures meeting the requirements of
the Uniform Reporting System.

"Affiliate" shall have the meaning set forth in the first paragraph of this
Agreement.

"Agreement" shall mean this Operating Agreement, including all schedules,
exhibits and annexes hereto, as amended or supplemented from time to time.

"Annual Work Program and Budget" shall mean, for any Calendar Year, a work
program and budget prepared and submitted by the Contractors to the Affiliate
and approved by the Affiliate in accordance with Clause 7.3, as amended or
supplemented from time to time in accordance with this Agreement.

"Area" shall mean the "Area" specified in Annex A hereto, as reduced through
the partial termination of this Agreement pursuant to Clause 19.2.

"Associated Entity" shall mean, with respect to any Person, any other Person
that, directly or indirectly, controls, is controlled by or is under common
control with such Person, whether through ownership of voting securities or
otherwise.  For this purpose, and without limiting the foregoing, (i) any
Person that owns more than 50% of the outstanding voting securities (or
equivalent ownership interests) of another Person shall be deemed to control
such Person, and (ii) any Person that owns at least 30% of the outstanding
voting securities (or equivalent


                                       2
<PAGE>   6

                                                                   BOQUERON AREA


ownership interests) of another Person that is acting as Operator pursuant to
Clause X and has executed a guarantee with respect to such Operator in the form
of Annex J shall be deemed to control such Operator in its capacity as Operator
(but not in its capacity as Contractor if such Person is also a Contractor).
Notwithstanding the foregoing, no sovereign, government, ministry, governmental
agency (other than a commercial entity acting in a commercial capacity) or
political subdivision of any sovereign shall be considered as Associated Entity
of any Party.

"Associated Gas" shall mean Natural Gas produced from a Field other than a Free
Gas Discovery. Any volume of Natural Gas that is supplied by the Affiliate from
outside the Area (including any Natural Gas previously delivered to the
Affiliate by the Contractors), injected into a well for purposes of gas lift
and subsequently recovered will not be considered to have been produced from
the Field concerned.

"Barrel" or "barrel" shall mean a quantity consisting of 42 United States
gallons, corrected to a temperature of 60 degrees Fahrenheit under one
atmosphere of pressure.

"Baseline Gas" shall have the meaning set forth in Clause 16.2.

"Baseline Production" shall mean, for any Quarter, a volume of Production of
Liquid Hydrocarbons in such Quarter, determined as follows:

*


* Confidential portion has been omitted pursuant to a request for confidential 
  treatment and filed separately with the Commission.



                                       3
<PAGE>   7
                                                                BOQUERON AREA

"Baseline Production Decline Factor" shall mean the fraction, expressed as a
decimal, of the annual decline in Baseline Production as stated in Annex I.

"Business Day" shall mean any day other than a Saturday, a Sunday or a day on
which commercial banks in Caracas are authorized or required to close by law,
decree, regulation or resolution or by decision of the Consejo Bancario
Nacional of Venezuela or any successor entity.

"Calendar Year" shall have the meaning set forth in the Accounting Procedures.

"Capital Expenditures" shall have the meaning set forth in the Accounting
Procedures. 

"Chargeable Expenditures" shall have the meaning set forth in the Accounting
Procedures.

"Connected" shall mean, with respect to two or more Hydrocarbon-bearing
structures, formations or deposits, that such structures, formations or
deposits have been reasonably demonstrated (i) by geologic and engineering
interpretations to be geologically continuous in the Hydrocarbon-bearing
section, (ii) by appropriate technical means to be in pressure communication
with one another in the Hydrocarbon phase, or (iii) to constitute an
Accumulation.

"Contractors" shall have the meaning set forth in the first paragraph of this
Agreement, and shall also include EPIC upon the execution by EPIC of a
counterpart of this Agreement pursuant to Clause 3.3.

"Contractor Well" shall mean any well that the Contractors have either drilled
or used in the Area for any purpose during the term of this Agreement. Any
production or injection well that is used for commercial production in the Area
as of the Takeover Date will be conclusively considered a "Contractor Well".

"Delivery Point" shall mean the point or points at which Production is to be
delivered by the Contractors to the Affiliate, as specified in Annex H hereto,
or as otherwise specified from time to time in accordance with Clause 15.3.

"Delivery Point Capacity" shall mean, for any time period and Delivery Point,
and for Hydrocarbons of any type and quality, the maximum volume of Production
of Hydrocarbons of such type and quality that the Contractors are authorized
to deliver at such Delivery Point, as specified in Annex H, as modified from
time to time in accordance with Clause 15.3.

"Development Plan" shall mean, with respect to any Field, such plan as the
Contractors submit to the Affiliate and that the Affiliate approves pursuant
to Clause 6.3 or 8.5, in each case meeting the requirements set forth in Annex 
E hereto (to the extent applicable to such Field) and the requirements of Clause
6.2, and in each case as amended from time to time in accordance with this 
Agreement.

"Dry" shall mean, as applied to any Natural Gas, such Natural Gas after the
extraction of propane, butane and similar liquids that may be removed by
extraction.




                                      4
<PAGE>   8
                                                                   BOQUERON AREA



"Effective Date" shall mean the date of execution of this Agreement by the
Other Contractors and the Affiliate.

"Environmental Claim and Cleanup Liability" shall mean: (a) any liabilities,
costs or expenses arising from or relating to any claim by a Venezuelan
governmental authority or other third party pursuant to Environmental Law for
personal injury, property damage, or damage to natural resources or the
environment (whether based on negligent acts or omissions, statutory liability,
or strict liability without fault or otherwise), in connection with the Area or
the activities or operations conducted therein; (b) any liabilities, costs or
expenses arising from or relating to any investigation, study, remediation or
abatement of any Release, to the extent required by Environmental Law, in
connection with the Area or the activities or operations conducted therein; or
(c) any fines or penalties assessed for non-compliance with Environmental Law
in connection with the Area or the activities or operations conducted therein. 


"Environmental Law" shall mean any Law or Decision relating to: (a)
conservation, improvement, protection, pollution, contamination or remediation
of the environment; (b) any Release, including, without limitation,
investigation and cleanup of such Release or threatened Release; and (c) the
storage, treatment, disposal, recycling or transportation of any Hazardous
Substance.

"EPIC" shall mean Exploracion y Produccion EPIC, S.A., an entidad de inversion
colectiva de capital de riesgo to be organized under the laws of the Republic
of Venezuela and sponsored by an Associated Entity of PDVSA for purposes of
giving Venezuelan citizens and other investors an opportunity to invest in the
Venezuelan hydrocarbon sector and related projects, and shall also mean another
sociedad anonima organized under the laws of the Republic of Venezuela by an
Associated Entity of PDVSA and designated in writing by PDVSA as acting on
behalf and in place of Exploracion y Produccion EPIC, S.A. until completion of
the latter's organization and the transfer to it of any Participation held by
such other sociedad anonima.

"Event of Force Majeure" shall have the meaning set forth in Clause 26.2.

"Exploration Activity" shall mean such activity as one or more of the
Contractors propose to the Affiliate and the Affiliate approves pursuant to
Clause 8.2, for the conduct, at the sole risk of such Contractors, of
exploration and/or appraisal activities in the Area outside the Field
Boundaries of the then-existing Fields, as amended from time to time in
accordance with this Agreement.

"Exploration Expenditures" shall have the meaning set forth in the Accounting
Procedures.

"Export Point" shall have the meaning set forth in Clause 15.3.

"Factor de Valorizacion" shall mean the payment to be made by the Contractors
pursuant to Clause 3.4.



                                      5

<PAGE>   9
                                                                   BOQUERON AREA



"Field" shall mean each of (i) the Initial Field and (ii) any
Hydrocarbon-bearing formation, or group of Hydrocarbon-bearing formations,
described as a Field by the Contractors in a Development Plan submitted to and
approved by the Affiliate pursuant to Clauses 8.4 and 8.5.

"Field Boundary" shall mean, (i) with respect to the Initial Field, the
boundaries of such Initial Field set forth in Annex B, as modified from time to
time in accordance with Clauses 8.8 or 8.9, and (ii) with respect to any other
Field, the boundary (or boundaries, in the case of a Field comprising more than
one formation) described as the Field Boundary in the related Development Plan
submitted in accordance with Clause 8.4, which shall include each area in which
such Field is located, and the upper and lower geological horizons of such
Field, and which may include an area, or an upper or lower geological horizon,
to which the Contractors can reasonably demonstrate such Field may extend, as
modified from time to time in accordance with Clauses 8.8 or 8.9.

"Final Well Report" shall mean, with respect to any exploration or appraisal
well, a report prepared in accordance with Clause 8.3.

"Free Gas Discovery" shall mean a discovery of Hydrocarbons outside the Field
Boundaries of existing Fields, that consist of Natural Gas and related
condensates that are primarily in the gas phase at reservoir conditions, where
the sale or other commercial disposal of the Natural Gas is likely to be
necessary in order to achieve commercial production of such Hydrocarbons.

"Hazardous Substance" shall mean any pollutant, contaminant, constituent,
chemical, mixture, raw material, intermediate product, finished product or
by-product, Hydrocarbon or any fraction thereof, asbestos or
asbestos-containing-material, polychlorinated biphenyls, or industrial, solid,
toxic, radioactive, infectious, disease-causing or hazardous substance,
material, waste or agent, including, without limitation, all substances,
materials or wastes which are identified or regulated under any Environmental
Law. 

"Hydrocarbons" shall mean Liquid Hydrocarbons and Natural Gas.

"Incremental Gas" shall have the meaning set forth in Clause 16.2.

"Incremental Production" shall mean, for any Quarter, all Production in excess
of Baseline Production for such Quarter, other than any Production of
Associated Gas.

"Initial Baseline Production" shall mean, a volume of Production of Liquid
Hydrocarbons in the first Quarter of the Operation Period, determined as
provided in Clause 11.8.

"Initial Field" shall mean the Hydrocarbon-bearing formation or group of
Hydrocarbon-bearing formations described as the "Initial Field" in Annex B
hereto.

"International Oil Industry Standards" shall mean such practices and procedures
employed generally in the petroleum industry throughout the world by prudent
and diligent operators under conditions and circumstances similar to those
experienced in connection with the relevant aspect or aspects of the Operating
Services.


                                       6
<PAGE>   10
                                                                   BOQUERON AREA


"Law or Decision" shall mean any applicable law, statute, ordinance, code,
rule, regulation, order, writ, injunction, decree, demand, judgment, ruling,
decision, determination, award, standard, permit, or variance of any Venezuelan
governmental authority, or any binding agreement with any Venezuelan
governmental authority.

"LIBOR" shall mean, as of any date of determination, the three-month London
Interbank Offered Rate, determined at 11:00 a.m., London time, on the first day
of the calendar quarter in which the date of determination occurs (or, if the
first day of such calendar quarter is not a London Banking Day, the immediately
preceding London Banking Day), as such rate appears on Telerate Page 3750, or
any successor page thereto. If Telerate Page 3750 or any successor page ceases
to publish the three-month London Interbank Offered Rate, the Parties shall
designate an alternative mechanism consistent with Eurodollar market practice
for determining such rate. For purposes of this definition, a "London Banking
Day" is a day on which dealings in deposits in U.S. dollars are transacted on
the London interbank market.

"Liquid Hydrocarbons" shall mean crude mineral oil, regardless of gravity, which
is produced at the wellhead in a liquid state at ambient conditions of
temperature and atmospheric pressure, or which is obtained from Natural Gas by
natural condensation.

"Maximum Economic Rate" shall mean, with respect to any Field, the maximum
rate of production at which such Field may be produced over the life of the
Field in order to obtain the maximum final economic recovery from the relevant
reserves, reflecting sound engineering and economic principles in accordance
with International Oil Industry Standards.

"Minimum Work Obligation" shall have the meaning set forth in Clause 4.3.

"Natural Gas" shall mean Wet gas, Dry gas, all other gaseous hydrocarbons and
all substances contained therein, which are produced from oil or gas wells,
excluding Liquid Hydrocarbons that condense naturally upstream of the Delivery
Point.

"Net Hydrocarbon Value" shall have the meaning set forth in the Accounting
Procedures.

"Operating Expenditures" shall have the meaning set forth in the Accounting
Procedures.

"Operating Services" shall have the meaning set forth in Clause 4.1.

"Operation Period" shall mean the 20-year period (or shorter period as may be
contemplated by the Development Plan for the relevant Field, as amended from
time to time) commencing on the Takeover Date with respect to the Initial Field
and the date of approval of the relevant Development Plan by the Affiliate with
respect to any other Field, as such period may be extended or reduced pursuant
to Clauses XIX or XX.

"Operator" shall mean UNION TEXAS VENEZUELA LIMITED, a Corporation organized
under the laws of the Commonwealth of the Bahamas, and any replacement or
additional Operator appointed pursuant to Clause X.

"Operator Guarantor" shall have the meaning set forth in Clause 10.1.



                                       7
<PAGE>   11
                                                                   BOQUERON AREA

"Other Contractors" shall mean all Contractors other than EPIC.

"Parties" shall mean the Affiliate, the Contractors, and, after their accession
to this Agreement, the Operator and EPIC.

"Participation" shall mean, with respect to any Field or Exploration Activity
and any Contractor, the percentage participation interest of such Contractor in
the rights and obligations of all the Contractors in relation to such Field, as
set forth initially in the relevant Development Plan, or Exploration Activity,
and as modified from time to time in accordance with Clause 3.3 or Clause XXVII.
The initial Participations of the Contractors in the Initial Field are set forth
in Annex F hereto, and the initial Participations of the Contractors in any
other Field shall be set forth in the relevant Development Plan.

"PDVSA" shall mean Petroleos de Venezuela, S.A., a sociedad anonima organized
under the laws of the Republic of Venezuela, and any successor in interest
thereto.

"Person" shall mean any individual, corporation, sociedad mercantil,
association, joint venture, partnership, trust, limited liability company,
joint-stock company, unincorporated organization or government, or any agency or
political subdivision thereof.

"Post-Takeover Date Environmental Claim and Cleanup Liability" shall mean any
Environmental Claim and Cleanup Liability other than the Pre-Takeover Date
Environmental Claim and Cleanup Liability, that is related to or results from
any activities or operations of the Contractors or Operator under this Agreement
(including the continued use after the Takeover Date of wells and other
facilities, installations and equipment existing in the Area and made available
to the Contractors as of the Takeover Date).

"Pre-Takeover Date Environmental Claim and Cleanup Liability" shall mean
Environmental Claim and Cleanup Liability to the extent arising from or relating
to acts, omissions, conditions or circumstances occurring or existing prior to
the Takeover Date; provided that, except as specifically provided in Clause
22.5, Pre-Takeover Date Environmental Claim and Cleanup Liability shall not
include any costs or expenses needed to cause the continuing use of any
facilities, installations, equipment or other assets, that are in use on or
prior to the Takeover Date and that are thereafter used by the Contractors in
connection with the Operating Services, to comply with applicable Environmental
Law governing continuing Releases or the ongoing storage, treatment, disposal,
recycling or transportation of any Hazardous Substance.

"Price Formula" shall mean the formula used to determine the value of any
Production, as set forth in Annex L hereto.

"Production" shall mean the Hydrocarbon production obtained from the
exploitation of the Fields.

"Quarter" shall have the meaning set forth in the Accounting Procedures.




                                       8
<PAGE>   12
                                                                   BOQUERON AREA

"Receipt Point" shall mean the point or points at which gas, electricity and
water are to be delivered by the Affiliate to the Contractors pursuant to Clause
11.2, as specified in Annex H hereto, or as may otherwise be agreed by the
Affiliation and the Contractors.

"Release" shall mean any spill, discharge, leak, emission, injection, escape,
dumping, leaching, dispersal, emanation, migration or release of any Hazardous
Substance into the environment, including, without limitation, the abandonment
or discard of barrels, containers, tanks or other receptacles containing or
previously containing any Hazardous Substance.


"Royalty" shall mean, with respect to any Production and any time period, the
deemed amount determined in the manner provided in the Accounting Procedures,
reflecting the exploitation tax payable in respect of such Production during
such time period.

"Service Fee" shall mean the payment made to the Contractors (i) in
reimbursement of advances made by the Contractors for the acquisition of goods
and services on behalf of the Affiliate and (ii) in compensation for the
Contractors' services hereunder, all as described in Clause XVII and the
Accounting Procedures.

"Standard Cubic Foot" or "standard cubic foot" or "SCF" shall mean the quantity
of gas occupying a United States cubic foot at 60 degrees Fahrenheit and one
atmosphere of pressure.

"Takeover Date" shall mean the date on which the Operator assumes control and
responsibility for all activities within the Area that are subject to this
Agreement, determined as provided in Clause 11.8.

"Transfer" shall mean any sale, assignment, delegation, transfer or other
disposition by any means (including by way of pledge or other similar
encumbrance) of all or any part of a Party's rights or obligations under this
Agreement; provided that "Transfer" shall not include a pledge of a Contractor's
rights to receive the Service Fee or other payments hereunder that (i) is made
as part of a bona fide financing transaction to enable a Contractor to perform
the Operating Services hereunder and (ii) does not purport to delegate to the
pledgee or any other Person any of the Contractor's other rights or obligations
hereunder, or give such pledgee or other Person any right to attach, seize or
execute on the Contractor's Participation or to transfer or convey all or any
part of such Participation to any third party.

"Transportation and Handling" shall mean the physical transportation of
Hydrocarbons from the wellhead or other point of extraction to the relevant
Delivery Point, including processing, separation, storage and other activities
reasonably necessary for such physical transportation and the transfer of such
Hydrocarbons to the Affiliate at such Delivery Point.

"Uniform Reporting System" shall have the meaning set forth in the Accounting
Procedures.

"Wet" shall mean, as applied to any Natural Gas, such Natural Gas before the
extraction of propane, butane and similar liquids that may be removed by
extraction.

"Bs" or "Bolivars" shall mean the lawful currency of the Republic of Venezuela.




                                       9
<PAGE>   13
                                                                   BOQUERON AREA



    "$" or "Dollars" shall mean the lawful currency of the United States of
    America.


                                       II


                                     OBJECT

2.1 This Agreement has as its object the rehabilitation and reactivation of
    certain Hydrocarbon reservoirs within the Area, the ongoing development and
    exploitation of such Hydrocarbon reservoirs, including the handling of any
    Production from such reservoirs, the Transportation and Handling of such
    Production to the relevant Delivery Points, the Delivery of such Production
    to the Affiliate at the Delivery Points, Exploration Activities and the
    other activities included in the Operating Services, in each case subject
    to the terms and conditions set forth herein.

2.2 The Parties recognize that the development, exploitation, and
    Transportation and Handling of, and the exploration for, Hydrocarbons
    constitute reserved activities within the meaning of the Organic Law
    Reserving to the State the Industry and Commerce of Hydrocarbons (LOREICH),
    and that accordingly the Contractors shall conduct the Operating Services
    hereunder not for their own account, but only for the account of the
    Affiliate, subject to the terms and conditions set forth herein.
    Hydrocarbons produced within the Area in accordance with this Agreement
    shall constitute the exclusive property of the Affiliate, and the economic
    rights of the Contractors under this Agreement shall be limited to the
    right to receive in cash the Service Fees payable hereunder from time to
    time (plus the direct reimbursement of other amounts in certain specified
    circumstances).

                                      III

            EFFECTIVENESS; GUARANTEES; EPIC; FACTOR DE VALORIZACION

3.1 This Agreement, and all obligations of the Parties hereto, shall come into
    effect on the Effective Date.

3.2 Concurrently with the execution of this Agreement, UNION TEXAS PETROLEUM
    HOLDINGS, INC. has provided to the Affiliate a guarantee of the respective
    obligations hereunder of such Contractor as is its Associated Entity, in
    the form set forth in Annex D hereto.

3.3 (a) The Affiliate shall promptly notify EPIC of the approval of a
    Development Plan for the Initial Field pursuant to Clause VI, at the same
    time that it notifies the Other Contractors. At any time following the
    Effective Date until the date which is 60 calendar days following the date
    on which the Affiliate gives EPIC such notice, EPIC may elect to become a
    Party to this Agreement by delivering an executed counterpart of this
    Agreement to the Affiliate.




                                       10

<PAGE>   14

                                                                   BOQUERON AREA

At the same time, EPIC shall give notice of such election to the Other
Contractors and to the Operator, if there is an Operator at such time.  Upon
delivery of an executed counterpart of this Agreement to the Affiliate (and
regardless of whether the Other Contractors and the Operator have yet received
notice),

(i)       EPIC shall immediately become a Contractor under this Agreement on the
          terms, and subject to the conditions, set forth herein and in Annex K,
          without any further action by any other Party;

(ii)      EPIC shall have the same rights and obligations under this Agreement
          as the Other Contractors, except that (1) EPIC shall have no liability
          to pay, or to reimburse any Other Contractor for payment of, the
          Factor de Valorizacion provided in Clause 3, 4, and (2) EPIC shall
          not be required to provide the Affiliate with a letter of credit or
          guarantee pursuant to Clause 4.4;

(iii)     EPIC will have a Participation of 10% in the Initial Field and in
          other rights under this Agreement, subject to modification or Transfer
          as provided herein; and

(iv)      in consideration of the assumption by EPIC of its obligations under
          this Agreement and Annex K, the respective Participations of each of
          the Other Contractors will be automatically reduced by 10% without
          any further action or formality of any kind; provided that the Other
          Contractors may, by notice to the Affiliate and EPIC given within 30
          days of EPIC's becoming a Party hereto, specify a different allocation
          in the reduction of their respective Participations and provided
          further that the Operator or its Associated Entity must in any event
          maintain a Participation of at least 27%.  No approval of such
          reductions by the Affiliate pursuant to Clause XXVII will be required.
          If requested, each Other Contractor will execute any and all documents
          and do any and all acts that may be necessary, useful or required by
          applicable law or regulation in order to complete such reduction.

(b) Beginning promptly after the Effective Date and continuing throughout the
entire option period provided in Clause 3.3(a), the Operator and the Other
Contractors shall immediately provide EPIC with copies (or, in the case of oral
communications, descriptions) of all documents, communications, reports,
notices and other information that are provided to, or received from, the
Affiliate, any Other Contractor or any ministry or agency of the Venezuelan
government in connection with the Agreement, including without limitation the
following:

          (i)  preliminary and final versions of any Development Plan, Annual
          Work Program and Budget, AFE, Final Well Report or Exploration
          Activity, and of any significant amendments thereto; and

          (ii) any significant proposal, commentary, disagreement, dispute,
          approval, response or other communications with regard to any of such
          documents.
 

                                       11
<PAGE>   15

                                                                   BOQUERON AREA

In addition, the Operator and Other Contractors shall afford EPIC reasonable
access to such additional information and documents as EPIC may reasonably
request with respect to the Agreement and the provision of the Operating
Services; provided that neither the Operator nor any Other Contractor will be
required to divulge proprietary technology to EPIC.

Such information provided to EPIC shall be subject to the confidentiality
provisions of Clause XXV. Prior to receiving any such information, EPIC shall
confirm in writing to each of the Other Contractors and to the Affiliate its
agreement to be bound by the provisions of Clause XXV (even if it does not
ultimately exercise the option to become a Party hereto) and to return all such
information in the event that it does not exercise such option.

(c)  (i) Within 60 calendar days of an election by EPIC to become a Party to 
     this Agreement pursuant to Clause 3.3(a), the Operator and Other
     Contractor(s) shall notify EPIC whether they intend to invite EPIC to
     become a party to any joint operating or similar agreement already
     existing between some or all of them or to enter into a new joint
     operating or similar agreement with some or all of them, in each case
     relating to rights and obligations of the Operator and/or Contractors, or
     the provision of Operating Services, under the Agreement. The Operator and
     Other Contractors shall have no obligation to invite EPIC to become a
     party to any such joint operating or similar agreement, and EPIC shall
     have no obligation to become a party if so invited. A decision during such
     60-day period not to invite EPIC to become a party to an existing
     agreement or to enter into a new agreement shall not preclude either such
     an invitation to EPIC in the future or the negotiation of other types of
     arrangements with EPIC.


     (ii) Unless EPIC and the Other Contractors otherwise agree in writing, the
     provisions of Annex K shall govern EPIC's relations with the Operator and
     the Other Contractor(s) with respect to the matters covered therein and
     shall be a binding and enforceable agreement between them and EPIC.

     (iii) Unless EPIC and the Other Contractors otherwise agree in writing,
     EPIC shall have the rights and obligations provided in Annex K as of the
     date that EPIC becomes a Party to this Agreement pursuant to Clause 3.3(a),
     including without limitation the obligation to reimburse to the Other
     Contractors its pro rata share of the expenses of the Operator and the
     Other Contractors (other than the Factor de Valorizacion) in respect of the
     Operating Services, between the Effective Date and the date on which EPIC
     becomes a party.

(d) The rights and obligations of EPIC under this Clause 3.3 will be legally
enforceable by EPIC and the Other Contractors as of the Effective Date,
regardless of whether EPIC ultimately elects to become a Party to the Agreement
under Clause 3.3(a). If EPIC does not become a Party to the Agreement, all such
rights and obligations will terminate at the


                                       12
<PAGE>   16
                                                                   BOQUERON AREA

    end of the option period provided in Clause 3.3(a), except for EPIC's
    obligations under the confidentiality provisions of Clause XXV which will
    continue as provided therein.

3.4 No later than five (5) Business Days after the Effective Date, the Other
    Contractors shall pay to the Affiliate in U.S. dollars the Factor de
    Valorizacion in the amount of $174,783,787, by wire transfer of immediately
    available funds to an account specified in writing by the Affiliate. The
    Factor de Valorizacion shall not be considered a Chargeable Expenditure of
    the Contractors for purposes of determining the Service Fee for any Quarter.

3.5 Each Contractor and Operator hereby represents and warrants that all of the
    technical, financial, legal, ownership and other information that it or its
    Associated Entity has provided to PDVSA in connection with qualification to
    participate in the bidding process that led to the award of this Agreement
    was and is true and correct in all material respects when submitted, as of
    the bidding and as of the date hereof, except as specifically disclosed in
    writing to PDVSA and the Affiliate prior to the bidding. Any material
    inaccuracy in such information will constitute a material breach of this
    Agreement under Clause 20.2, which will give the Affiliate the right to
    terminate this Agreement with respect to the Contractor concerned and any
    other Contractor that is aware or whose Associated Entity is aware of such
    material inaccuracy. The cure period provided in Clause 20.2 will not apply
    to such termination.


                                       IV

                  OPERATING SERVICES: MINIMUM WORK OBLIGATION

4.1 On the terms and subject to the conditions set forth in this Agreement, the
    Contractors undertake to provide the following services (the "Operating
    Services") for the Affiliate;

    (i)     the rehabilitation, reactivation and enhancement of the Initial
            Field, in accordance with the relevant Development Plan;

    (ii)    the uninterrupted delivery of the Baseline Production to the
            Affiliate;

    (iii)   Exploration Activities with respect to other parts of the Area in
            accordance with Clause VIII, and the development and exploitation 
            of any resulting Fields, in accordance with the relevant Development
            Plans;

    (iv)    the Transportation and Handling of Production from the Fields to
            the applicable Delivery Points, in accordance with the relevant
            Development Plans;

    (v)     the delivery of such Production to the Affiliate at such Delivery
            Points in accordance with Clause 15.4; and

    (vi)    any other service to be performed by the Contractors in the Area
            for the Affiliate as set forth in this Agreement.


                                       13
<PAGE>   17
                                                                   BOQUERON AREA


4.2  It is the understanding of the Parties that:

     (i)       all activities involved in the provision of the Operating
               Services shall be carried out by the Contractors for the account
               of the Affiliate;

     (ii)      all costs incurred in the provision of the Operating Services
               shall be funded directly by the Contractors, and not by the
               Affiliate;

     (iii)     such costs shall be recoverable by the Contractors only from and
               to the extent of the Service Fee, and shall not be recoverable if
               the Service Fee is insufficient to permit such recovery (except
               for the direct reimbursement of certain expenses in certain
               specified circumstances);

     (iv)      the Service Fee shall be the sole remuneration payable to the
               Contractors for the provision of the Operating Services, and no
               other payment or compensation of any kind will be due or payable
               to the Contractors, either during the term of this Agreement or
               following its termination, regardless of whether the Service Fee
               is adequate to cover their costs and expenses in providing the
               Operating Services (except for the direct reimbursement of
               certain expenses in certain specified circumstances); and

     (v)       all right, title and interest to any Production obtained by the
               Contractors shall belong exclusively to the Affiliate.

4.3  Within a period of 3 years beginning on the Takeover Date, the Contractors
     shall be obligated to expend in the provision of the Operating Services
     with respect to the Initial Field an amount of Chargeable Expenditures at
     least equal to $13,000,000 (the "Minimum Work Obligation"). Any
     modification to the Minimum Work Obligation requires the prior approval of
     the Affiliate, which the Affiliate may grant or deny in its discretion.
     
     If the Agreement terminates for any reason or the time period specified in
     the preceding paragraph ends, in either case without the completion of the
     Minimum Work Obligation in full, then the Contractors shall pay the
     Affiliate the unexpended balance of the Minimum Work Obligation in Dollars
     in cash within 30 days of such termination or the end of such period, as
     compensation for such non-completion.

4.4  Concurrently with the execution of this Agreement, the Contractors, at
     their own cost and expense, have provided the Affiliate with one or more
     irrevocable stand-by letters of credit from financial institutions
     acceptable to the Affiliate in the form of Annex O hereto, or guarantees
     acceptable to the Affiliate in the form of Annex M or M-2 hereto, in an
     aggregate amount equivalent to   *  . In the event that any such
     letter of credit would expire prior to the end of the period specified for
     the completion of the Minimum Work Obligation in the first sentence of
     Clause 4.3, the Contractor(s) that provided such letter of credit shall
     replace it with another irrevocable stand-by letter of credit in the form
     of Annex O that provides for a drawing period ending on the last day of
     such period. If the Affiliate draws any letter of credit delivered pursuant
     to this Clause because it would otherwise expire prior to completion of the
     Minimum Work Obligation, the Affiliate shall: (a) return all drawn funds to


* Confidential portion has been omitted pursuant to a request for confidential 
  treatment and filed separately with the Commission.

                                       14
<PAGE>   18
                                                                   BOQUERON AREA


     the Contractor(s) concerned upon receipt of a replacement letter of credit
     in like amount meeting the requirements of the first sentence of this
     Clause and paragraph (iii)(b) of Exhibit 3 of Annex O; (b) return such
     funds to the Contractor(s) concerned as and when the Contractor(s) would
     be entitled to the reduction of a letter of credit as provided under this
     Clause; or (c) be entitled to retain any balance of such funds as provided
     in the last sentence of this Clause. Under no circumstances shall the
     Affiliate owe any interest with respect to any such funds. The value of
     any such letter of credit or guarantee shall be reduced at the request of
     the Contractors every 3 months, commencing 3 months after the Takeover
     Date, by the amount of funds spent by the Contractors on the Operating
     Services in respect of the Initial Field prior to the date of reduction
     (or a pro rata share of such amount, based on the Participation in the
     Initial Field of the Contractor that provided the letter of credit or
     guarantee, if more than one letter of credit or guarantee is provided by
     the Contractors), upon certification by the Affiliate that such amount has
     been properly charged in accordance with the Accounting Procedures. Only
     funds expended on activities relating to the Initial Field (as allocated
     in accordance with Clause 17.3 and the Accounting Procedures) shall count
     toward such reduction. In addition, the value of any such letter of credit
     or guarantee shall be reduced by 10% at the request of the Contractors if
     EPIC becomes a Party to this Agreement pursuant to Clause 3.3. Any such
     letter of credit, guarantee or financial undertaking shall be terminated
     upon certification by the Affiliate that the required amounts have been
     expended. Absent disagreement regarding expenditures, the Affiliate agrees
     to make such certification within thirty (30) days following the
     presentation by the Contractors of documentary evidence reflecting or
     showing such expenses. Failure by the Contractors to fulfill the Minimum
     Work Obligation as specified in Clause 4.3 shall entitle the Affiliate to
     demand payment of the amount of such guarantees and letters of credit, as
     compensation for such failure.

                                        
                                       V
                                        
                        AFFILIATE APPROVAL REQUIREMENTS


5.1  The activities to be conducted by the Contractors as part of the Operating
     Services hereunder shall be undertaken for the account of the Affiliate.
     Accordingly, in order to ensure that the Operating Services are consistent
     with the objectives of this Agreement, the rights of the Contractors to
     perform the Operating Services shall be subject to the approval by the
     Affiliate of the matters specified in Clause 5.2.

5.2  The following matters shall be required to be presented to the Affiliate
     for approval:

     (i)  the Development Plan for the Initial Field, as provided in Clause
          6.1, and any amendment thereto, as provided in Clause 9.1;

     (ii) each Annual Work Program and Budget, as provided in Clause 7.1, and
          any amendment thereto required to be approved pursuant to Clause 7.7;




                                       15
<PAGE>   19
                                                                   BOQUERON AREA




     (iii)     each Exploration Activity, as provided in Clause 8.1, and any
               further Exploration Activity, as provided in Clause 8.3;

     (iv)      the Development Plan for each additional Field, as provided in
               Clause 8.4, and any amendment thereto, as provided in Clause 9.1;

     (v)       any AFE exceeding the thresholds set forth in Clause 7.6(ii), and
               any amendment thereto required to be approved pursuant to Clause
               7.7;

     (vi)      any proposed modification of the Minimum Work Obligation, as
               provided in Clause 4.3;

     (vii)     any proposed extension of an Operation Period, as provided in
               Clause 19.3;

     (viii)    any proposed agreement with respect to a Field extending beyond
               the Area, as provided in Clause XIII;

     (ix)      any proposal for the designation of a replacement, additional or
               interim Operator, as provided in Clause X;

     (x)       the execution, modification or termination of any contract or
               other arrangement for the purchase, sale, leasing or other
               acquisition, disposition or administration of goods or services
               in connection with the Operating Services, from the Operator
               (acting as a supplier of goods or services and not in its
               capacity as Operator), any Contractor or any of their respective
               Associated Entities, involving aggregate expenditures in excess
               of  *  , or its equivalent in any other currency;

     (xi)      the proposal for the designation of the external independent
               auditors to review the Contractors statements and invoices in
               accordance with Clause 18.3;

     (xii)     any proposal by the Contractors to designate an additional
               Delivery Point or to modify the Delivery Point Capacity of any
               Delivery Point, as provided in Clause 15.3;

     (xiii)    any proposal by the Contractors to calculate the Service Fee for
               two or more Fields on a combined basis, or otherwise to include
               costs not allocable to a Field in accordance with the Accounting
               Procedures to be included in the calculation of the Service Fee
               for such Field, as provided in Clause 17.3;

     (xiv)     any proposed Transfer by or change in control of any of the
               Contractors, as provided in Clause XXVII;

     (xv)      any proposed modification of an existing Field Boundary as
               provided in Clauses 8.8 or 8.9;

     (xvi)     any proposed disposition or use of certain assets as provided in
               Clauses 12.3 or 12.4; and



* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.



                                       16
<PAGE>   20
                                                                   BOQUERON AREA


     (xvii) any other matter specifically requiring the approval of the
     Affiliate in accordance with this Agreement.

5.3  With respect to any matter requiring the approval of the Affiliate pursuant
     to this Agreement, such approval may not be unreasonably withheld, except
     where it is specified that the decision is within the Affiliate's
     discretion. Except as otherwise provided herein, the Affiliate must make a
     decision with respect to any matter submitted for its approval within 60
     days following submission, except an Annual Work Program and Budget for
     which the Affiliate may take 90 days (30 days in the case of the first
     Annual Work Program and Budget submitted after approval of the Development
     Plan for the Initial Field). In the event the Affiliate does not make a
     decision regarding a matter submitted for its approval within the time
     specified, the relevant matter will be deemed approved. If the Affiliate
     denies its approval as to any matter, it will provide an explanation to the
     Contractors stating the reasons for such denial. In the event the
     Affiliate's approval is denied, the Contractors may, to the extent
     permitted by the relevant provisions of this Agreement, revise their
     proposal to take into account the Affiliate's comments and submit their
     revised proposal for approval, which will be subject to the same standards
     and time periods (counted from the date of resubmission) as are applicable
     to the initial submission.

5.4  So long as the Contractors conduct their activities in accordance with this
     Agreement, obtain the approval of the Affiliate with respect to the matters
     set forth in Clause 5.2 and comply with the terms of the relevant
     Development Plans, Annual Work Programs and Budgets and other decisions
     made by the Affiliate pursuant to Clause 5.2, the Contractors shall be
     authorized to conduct the Operating Services in the manner they deem to be
     most appropriate.


                                       VI

                                DEVELOPMENT PLAN

6.1  No later than 6 months following the Effective Date, the Contractors must
     submit to the Affiliate for approval a proposed Development Plan
     contemplating the rehabilitation, reactivation and/or enhancement of the
     Initial Field. No physical operations within the Area may be conducted by
     the Contractors pursuant to this Agreement prior to the approval of the
     Development Plan, except as provided in Clause 11.8 or as otherwise
     approved by the Affiliate. The Affiliate will provide reasonable
     cooperation to the Contractors in the performance of those activities that
     are necessary or convenient to the Contractors in connection with the
     preparation of the Development Plan for submission to the Affiliate.

6.2  The Development Plan proposed for the Initial Field must be prepared in
     accordance with the guidelines set forth in Annex E hereto (to the extent
     applicable to the Initial Field) and in any event must include:


                                       17
<PAGE>   21

                                                                   BOQUERON AREA

         (i)      the proposed rehabilitation, reactivation or enhancement
                  scheme for the Initial Field, including a general description
                  of the expected activities for the relevant Operation Period
                  and a discussion of alternative schemes that were considered;

         (ii)     an estimate of proved, probable and possible reserves in the
                  Initial Field (in each case, determined on a life-of-field
                  basis, without regard to the duration of the Operation
                  Period);

         (iii)    an estimate of the production profile of the Hydrocarbons that
                  the Contractors expect to deliver to the Affiliate in each
                  year during the Operation Period for the proved and proved
                  plus probable reserves cases, and an explanation of how the
                  production profile in the proved reserve case achieves the
                  Maximum Economic Rate of Production (unless Production is
                  constrained by Delivery Point Capacity);

         (iv)     projected Capital and Operating expenditures for the Operation
                  Period for the proved and proved plus probable reserves cases
                  (in constant dollars and without adjustment for expected
                  inflation), prepared in accordance with the Uniform Reporting
                  System;

         (v)      an estimate of the Service Fees that the Contractors expect to
                  be payable by the Affiliate during each year of the Operation
                  Period for each reserves case;

         (vi)     the designation of any additional Delivery Point(s) that the
                  Contractors propose to use in accordance with Clause 15.3 and
                  a full description of the Transportation and Handling
                  infrastructure that will be used to transport Hydrocarbons to
                  such Delivery Point(s);

         (vii)    an environmental contingency plan in accordance with Clause
                  22.1;

         (viii)   a plan for the periodic inspection of all inactive wells in
                  the Initial Field at least twice per year and, unless
                  otherwise agreed by the Affiliate in its discretion, a plan
                  for the periodic surveillance of subsidence in and around the
                  Area that may be affected by Production; and

         (ix)     a plan for the transfer of Operations in accordance with
                  Clause 11.8.

6.3      The Affiliate will approve a proposed Development Plan for the Initial
         Field if:

         (i)      it complies with the provisions of Clause 6.2, contemplates
                  a budget that meets the Minimum Work Obligation, and provides
                  for the delivery at each Delivery Point only of Production
                  that is within the Delivery Point Capacity of such Delivery
                  Point and that satisfies the quality standards for such
                  Delivery Point as specified in Annex H or otherwise
                  determined in accordance with Clause 15.3;

         (ii)     provides for the uninterrupted delivery of the Baseline
                  Production at the Delivery Point(s);


                                       18
<PAGE>   22
                                                                   BOQUERON AREA

     (iii)     the production profile in the proved reserve case calls for
               Production at the lesser of (x) the Maximum Economic Rate for the
               Initial Field, and (y) the aggregate of the Delivery Point
               Capacities of the different Delivery Points to which the
               Development Plan contemplates delivery of Hydrocarbons; and

     (iv)      such proposed Development Plan is consistent with International 
               Oil Industry Standards.

     The Affiliate may approve a Development Plan that does not meet one or more
     of the standards set forth above in its discretion.

6.4  If the Affiliate rejects a proposed Development Plan for failure to comply
     with the standards set forth in either Clause 6.3(iii) or (iv), the
     Operator may, at any time up to 30 days after the date of rejection,
     request that the question of whether the Development Plan complies with
     such provisions be referred to an independent expert in accordance with
     Clause 23.3. The decision of the independent expert as to the proposed
     Development Plan will be final and binding.

6.5  If a proposed Development Plan is rejected by the Affiliate (and, if there
     is a review by an independent expert, such independent expert confirms such
     rejection), then the Contractors may, at their option:

     (i)       submit a revised Development Plan; or

     (ii)      relinquish their rights under this Agreement, in which case this
               Agreement will terminate.

                                      VII

                     ANNUAL WORK PROGRAMS AND BUDGETS; AFEs

7.1  No later than 30 days after the approval of a Development Plan for a
     Field, the Contractors shall submit for approval to the Affiliate a
     proposed Annual Work Program and Budget for the remainder of the then
     current calendar year. In each year thereafter, the Contractors shall
     submit for approval to the Affiliate a proposed Annual Work Program and
     Budget for the immediately following calendar year, no later than the date
     notified by the Affiliate to the Contractors at least 90 days in advance of
     the due date for the following year's proposed Annual Work Program and
     Budget. Each Annual Work Program and Budget shall contain, at a minimum,
     the following information with respect to each Field in the Area:

     (i)       a detailed description of the work that the Contractors expect
               to undertake in the implementation of the Development Plan during
               such year;

     (ii)      the volume of Hydrocarbons that the Contractors expect to
               deliver to the Affiliate during such year, broken down on a
               monthly basis;



                                       19
<PAGE>   23
                                                                   BOQUERON AREA

     (iii)     a budget for such year meeting the requirements of the Uniform
               Reporting System; and

     (iv)      an estimate of the total amount of Service Fees that the
               Contractors expect to be payable by the Affiliate in such year in
               respect of such Field, as well as a breakdown of such fees in
               respect of each Quarter in such year.

7.2  Together with the proposed Annual Work Program and Budget, the Contractors
     will provide to the Affiliate an update to the Development Plan, reflecting
     modifications arising from the Annual Work Program and Budget for such year
     and for prior years, taken as a whole, as well as a reserves statement
     prepared in accordance with the Uniform Reporting System. Such update will
     not constitute an amendment to the Development Plan; a Development Plan may
     only be amended in accordance with Clause IX.

7.3  The Affiliate will approve any proposed Annual Work Program and Budget
     submitted in accordance with Clause 7.1 if:

     (i)       the Production projected for the relevant year is no more than
               20% below the Production for the relevant year projected in the
               Development Plan for the proved reserves case;

     (ii)      the Operating Expenditures per barrel of Liquid Hydrocarbons
               reflected in such Annual Work Program and Budget are not more
               than 20% above the Operating Expenditures per barrel of Liquid
               Hydrocarbons projected for the relevant year in the Development
               Plan for the proved reserves case (as adjusted for inflation in
               accordance with the Accounting Procedures);

     (iii)     the Capital Expenditures reflected in such Annual Work Program
               and Budget are not more than 20% above the Capital Expenditures
               projected for the relevant year in the Development Plan for the
               proved reserve case (as adjusted for inflation in accordance with
               the Accounting Procedures); and

     (iv)      the proposed work plan is consistent with the International Oil
               Industry Standards.

     The Affiliate may approve a proposed Annual Work Program and Budget that
     does not meet these standards at its discretion.

7.4  If the Affiliate rejects a proposed Annual Work Program and Budget for
     failure of the work plan to comply with the standards set forth in Clause
     7.3(iv), the Operator may, at any time up to 30 days after the date of
     rejection, request that the question of whether such work plan complies
     with such standards be referred to an independent expert in accordance with
     Clause 23.3. The decision of the independent expert will be final and
     binding with respect to such question.

7.5  In the event the Affiliate does not approve all or any part of the budget
     portion of any proposed Annual Work Program and Budget:



                                       20
<PAGE>   24
                                                                   BOQUERON AREA


         (i)      the Contractors may carry out those activities as to which a
                  work plan and budget has been approved pending approval of
                  the remainder;

         (ii)     the Contractors may continue to fulfill any commitment
                  entered into in accordance with an AFE that was previously
                  approved by the Affiliate, up to the maximum amount
                  authorized in such AFE;

         (iii)    the Contractors may continue operations contemplated in the
                  Development Plan under an interim operating budget that does
                  not exceed the operating budget for the prior year by more
                  than 5% overall or 10% as to any line item (in each case as
                  adjusted for inflation in accordance with the Accounting
                  Procedures); and

         (iv)     the Contractors may undertake activities necessary in an
                  emergency situation for the preservation of life, health,
                  safety, the environment or the integrity of the Field (in
                  which case the Contractors shall as promptly as practicable
                  report the relevant activities to the Affiliate and prepare a
                  revised budget reflecting the emergency expenditures in
                  accordance with the Accounting Procedures).

7.6      (i)      Prior to incurring any commitment or expenditure that is
                  estimated to be in excess of   *  , the Contractors shall
                  send to the Affiliate an AFE, containing their best estimate
                  of the total funds required to carry out the relevant work,
                  the amount of direct expense estimated to be incurred by the
                  Contractors, the estimated timing of expenditures, and any
                  other necessary supportive information. Notwithstanding the
                  foregoing, the Contractors shall not be obliged to furnish an
                  AFE to the Affiliate with respect to any general and
                  administrative costs that are listed as separate line items
                  in an approved Annual Work Program and Budget. All such AFEs,
                  except as provided in Clause 7.6(ii), shall be for
                  informational purposes only and, provided the work and funds
                  to be expended therefor are authorized in the relevant Annual
                  Work Program and Budget, the Contractors shall not be
                  required to obtain approval for such AFEs.

         
         (ii)     For any AFE in excess of   *  , prior to expending any
                  funds or incurring any commitments for work, the Contractors
                  shall obtain the approval of the Affiliate. The Affiliate
                  will approve an AFE if the total costs for the relevant
                  commitment or expenditure are no more than 10% above the
                  amount set forth in the relevant Annual Work Plan and Budget,
                  as adjusted for inflation as provided in the Accounting
                  Procedures. The Affiliate may approve an AFE that does not
                  meet this standard in its discretion.

         (iii)    The requirements of Clause 7.6(i), but not Clause 7.6(ii),
                  shall apply to Exploration Expenditures in connection with
                  approved Exploration Activities under Clause VIII.

7.7      (a) The Contractors shall be entitled to incur without further
         approval of the Affiliate an overexpenditure for any line item in the
         budget portion of an approved Annual Work Program and Budget up to ten
         percent (10%) of the authorized amount for such line item, so long as
         the cumulative total of all overexpenditures for a calendar year does
         not exceed five percent (5%)of the total amount set forth in such
         Annual Work Program and Budget. Approval of a modified budget
         reflecting proposed overexpenditures above either of these thresholds
         shall be



* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.

                                       21
<PAGE>   25

                                                                   BOQUERON AREA

         granted if the standards set forth in Clauses 7.3(ii) and 7.3(iii) are
         met, and otherwise may be granted or denied by the Affiliate in its
         discretion. In addition, at such time as the Contractors forecast that
         the cumulative expenditures authorized in any AFE will be exceeded by
         more than 10%, the Contractors shall furnish a supplemental AFE for
         the estimated overexpenditures to the Affiliate; in the case of an AFE
         requiring Affiliate approval under Clause 7.6(ii), such supplemental
         AFE shall be subject to approval which shall be granted or denied
         in accordance with the same standards as were applicable to the
         original AFE.

         (b) In addition, the Contractors may undertake activities necessary in
         an emergency situation for the preservation of life, health, safety,
         the environment or the integrity of a Field (in which case the
         Contractors shall as promptly as practicable report the relevant
         activities to the Affiliate and prepare a revised budget reflecting
         the emergency expenditures in accordance with the Accounting
         Procedures).


                                      VIII


                      ACTIVITIES OUTSIDE FIELD BOUNDARIES


8.1      Following the approval of the Development Plan for the Initial Field,
         the Contractors may from time to time propose to the Affiliate for
         approval Exploration Activities they wish to conduct in any part of
         the Area that is not within the Field Boundaries of existing Fields.
         No such Exploration Activities may be commenced by the Contractors
         outside such Field Boundaries before approval by the Affiliate in
         accordance with this Clause.

8.2      Any Exploration Activity submitted pursuant to Clause 8.1 will be
         approved by the Affiliate if it is consistent with International Oil
         Industry Standards. If the Affiliate rejects a proposed Exploration
         Activity, the Contractors may, at any time up to 30 days after the
         date of rejection, request that the question of whether the proposed
         Exploration Activity complies with such standard be referred to an
         independent expert in accordance with Clause 23.3. The decision of the
         independent expert will be final and binding.

8.3      (a) No later than sixty (60) days after the completion of an
         Exploration Activity consisting of the drilling and testing of an
         exploration, appraisal or delineation well in the Area, the
         Contractors shall submit to the Affiliate a Final Well Report. The
         Final Well Report shall set forth in detail such information as the
         Contractors have been able to obtain regarding the nature of any
         Hydrocarbon-bearing structures or formations penetrated during the
         drilling of such well and such other information as may be required by
         applicable Venezuelan Laws and Decisions. Such Final Well Report will
         also set forth a recommendation for any further Exploration
         Activities, drilling or otherwise, that the Contractors consider the
         results warrant. If the Contractors propose to conduct any such
         further Exploration Activities, they shall so indicate in the Final
         Well Report or in a request for approval of further Exploration
         Activities. Unless the Affiliate notifies the Operator within 30 days
         of receipt of the Final Well Report or such request that it is denying
         approval of such further Exploration Activities, the Affiliate will be
         deemed to have approved such further Exploration Activities. Approval
         of any further


                                       22
<PAGE>   26
                                                                   BOQUERON AREA



     Exploration Activities (whether resulting from a Final Well Report or
     otherwise) shall be granted or denied, and shall be subject to independent
     expert review, on the same basis as the original Exploration Activities.

     (b) In the event that the Contractors wish to conduct a well test, they
     shall submit to the Affiliate for approval a plan for such well test,
     indicating the proposed duration of the test, the expected Production of
     the well, the proposed Delivery Point for such Production and all other
     relevant information relating to the test. Such test shall not exceed 90
     days and shall be conducted in accordance with all applicable Laws and
     Decisions. The Affiliate's approval or rejection of such plan shall be
     subject to independent expert review on the same basis as other Exploration
     Activities. Subject to the limitations and requirements set forth in Clause
     XV, the Affiliate will accept the test Production from such well, and the
     Contractors may at their option either (i) add such test Production to the
     Production from any single existing Field for purposes of calculating the
     Net Hydrocarbon Value for such Field for the Quarter or Quarters in which
     such test Production is delivered, or (ii) hold the total Net Hydrocarbon
     Value attributable to such test Production for subsequent inclusion
     (without inflation adjustment) in the Service Fee calculation for the first
     Quarter of the Operation Period for a new Field that includes the well that
     produced the test Production. No expenses associated with the test may be
     charged to such existing Field or any other existing Field; such expenses
     may only be recovered to the extent that they constitute Exploration
     Expenditures that are chargeable to a new Field in accordance with Article
     5.4.5 of the Accounting Procedures.

8.4  The Contractors shall be entitled at any time to submit a proposed
     Development Plan to the Affiliate contemplating the development of one or
     more Hydrocarbon-bearing structures, formations or deposits located outside
     the Field Boundaries of existing Fields. Any such proposed Development Plan
     must be prepared in accordance with the guidelines for the preparation of a
     Development Plan for the Initial Field set forth in Clause 6.2 and Annex E
     (except that relevant information must be provided with respect to the
     proposed Field; rather than the Initial Field). In addition, any such
     Development Plan must set forth the Field Boundary for the proposed Field
     and the Participation of each Contractor (with the Participation of the
     Operator or its Associated Entity meeting the requirements of Clause 10.3).
     The Contractors may not undertake any development or exploitation
     activities with respect to the proposed Field until the relevant
     Development Plan is approved.

     If any part of such Hydrocarbon-bearing structures, formations or deposits
     that the Contractors propose to develop (or any part of any
     Hydrocarbon-bearing structure, formation or deposit that is Connected
     thereto) extends beyond the boundary of the Area, the Contractors shall
     comply with the provisions of Clause XIII before submitting a Development
     Plan, unless the Connection with such part of a Hydrocarbon-bearing
     structure, formation or deposit extending beyond the Area boundary results
     exclusively from the existence of an Accumulation.

8.5  In deciding whether to approve any Development Plan submitted in accordance
     with Clause 8.4, the Affiliate will observe the same standards for approval
     as are set forth in Clause 6.3 with respect to the Development Plan for the
     Initial Field, except that:


                                       23





<PAGE>   27
                                                                  BOQUERON AREA

     (i)  the Affiliate will disregard whether the budget contained in such
          Development Plan would meet the Minimum Work Obligation and whether
          the Development Plan provides for delivery of the Baseline Production;
          and

     (ii) the Affiliate will be obliged to approve any proposed Development Plan
          only if the proposed Field Boundary (A) is limited to the
          Hydrocarbon-bearing formations, structures or deposits that the
          Contractors propose to develop, (B) includes all Connected
          Hydrocarbon-bearing structures, formations or deposits (other than
          any part of a Hydrocarbon-bearing structure, formation or deposit that
          extends beyond the boundary of the Area if the Connection to such part
          results exclusively from the existence of an Accumulation), and (C) is
          entirely within the Area.

     The Affiliate may approve a Development Plan that does not meet one or more
     of the standards set forth above in its discretion.

8.6  If the Affiliate rejects a proposed Development Plan submitted pursuant to
     Clause 8.5, the Operator may request independent expert review on the same
     basis as provided for the Development Plan for the Initial Field in Clause
     6.4. In addition, the Operator may request independent expert review, on
     the same basis and subject to the same timing requirements, if the
     Development Plan is rejected for failure to designate the Field Boundary in
     accordance with the standards set forth in Clause 8.5(ii).

8.7  In the event that a Development Plan submitted pursuant to Clause 8.4 is
     approved by the Affiliate, the relevant Hydrocarbon-bearing structures,
     formations or deposits shall be considered a Field, which shall be subject
     to the same Annual Work Program and Budget approval process as is provided
     in Clause VII for the Initial Field.

8.8  In the event that any Exploration Activity provides evidence that a
     Hydrocarbon-bearing structure, formation or deposit outside the Field
     Boundaries of the existing Fields in Connected to one or more of such
     Fields, the Contractors shall submit an amendment to the existing
     Development Plan for the relevant Field or Fields in accordance with Clause
     9.1, including a description of a modified Field Boundary that takes into
     account the Connected structure(s), formation(s) or deposit(s). The
     Affiliate shall approve such amendment if it meets the standards set forth
     in Clause 8.5(ii) and Clause 9.3.

     If any part of such Hydrocarbon-bearing structure, formation or deposit (or
     any part of any Hydrocarbon-bearing structure, formation or deposit that is
     Connected thereto) extends beyond the boundary of the Area, the Contractors
     shall comply with the provisions of Clause XIII before submitting an
     amendment to the Development Plan, unless the Connection with such part of
     a Hydrocarbon-bearing structure, formation or deposit extending beyond the
     Area boundary results exclusively from the existence of an Accumulation.

8.9  The Contractors may at any time propose to the Affiliate the combination
     into a single Field of two or more existing Fields that are not Connected
     or of an existing Field and a Hydrocarbon-bearing formation outside the
     Field Boundary of such existing Field that are not Connected. The
     Affiliate may approve or reject such proposal in its discretion.


                                      24
<PAGE>   28
                                                                   BOQUERON AREA

                                       IX

                        AMENDMENTS TO DEVELOPMENT PLANS

9.1  The Contractors must submit an amendment to a Development Plan to the
     Affiliate for approval if it is expected that:

     (i)       the next Annual Work Program and Budget will contemplate 
               Production more than 20% below the level set forth for the
               relevant year in the Development Plan for the proved reserve
               case;

     (ii)      the next Annual Work Program and Budget will contemplate Capital
               Expenditures more than 20% above the Capital Expenditures
               projected for the relevant year in the Development Plan for the
               proved reserve case (as adjusted for inflation in accordance with
               the Accounting Procedures);

     (iii)     the next Annual Work Program and Budget will contemplate
               Operating Expenditures per barrel of Liquid Hydrocarbons more
               than 20% above the amount set forth in the Development Plan for
               the proved reserve case (as adjusted for inflation in accordance
               with the Accounting Procedures);

     (iv)      cumulative Production during the Operation Period will be more
               than 20% below the Production volume set forth in the Development
               Plan for the proved reserve case;

     (v)       average Operating Expenditures per barrel of Liquid Hydrocarbons
               during the Operation Period will be more than 20% above the
               amount set forth in the Development Plan for the proved reserve
               case (as adjusted for inflation in accordance with the Accounting
               Procedures);

     (vi)      total Capital Expenditures during the Operation Period will be
               more than 20% above the amount set forth in the Development Plan
               for the proved reserve case (as adjusted for inflation in
               accordance with the Accounting Procedures);

     (vii)     conditions change such that (A) the Maximum Economic Rate
               determined in light of such new conditions varies by more than
               20% from the Maximum Economic Rate reflected in the Development
               Plan currently in effect, and (B) such new Maximum Economic Rate
               is less than aggregate Delivery Point Capacity; or

     (viii)    an approved Exploration Activity provides evidence that a
               Hydrocarbon-bearing structure, formation or deposit outside the
               Field Boundaries of the Field that is subject to such Development
               Plan is Connected to such Field as provided in Clause 8.8.




                                       25
<PAGE>   29
                                                                   BOQUERON AREA

     The Contractors may at their option submit amendment to the Development
     Plan to the Affiliate for reasons other than those set forth above.

9.2  If at any time the Affiliate believes that the Contractors are required to
     submit an amendment to a Development Plan to the Affiliate, the Affiliate
     may notify the Contractors of such belief. The contractors shall submit an
     amendment to the Development Plan to the Affiliate, or notify the
     Affiliate that they believe no such amendment is required, within 60 days
     after the Contractors receive such notice from the Affiliate. If the
     contractors notify the Affiliate that they believe no such amendment is
     required, the Affiliate may at any time up to 30 days after it receives the
     notice from the Contractors request the appointment of an independent
     expert in accordance with Clause 23.3 to determine whether an amendment is
     required. The decision of the independent expert will be final and binding.

9.3  In the case of any amended Development Plan presented for approval, the
     Affiliate will approve such an amended Development Plan if it meets the
     standards for approval of an original Development Plan (except the standard
     relating to the Minimum Work Obligation, to the extent that the Minimum
     Work Obligation has previously been satisfied, and the standard relating
     to delivery of the Baseline Production for any Field other than the
     Initial Field). In addition, any amendment required by Clause 8.8 must
     meet the standards of that Clause. If the Affiliate denies its approval of
     such an amendment, the denial shall be subject to independent expert
     review in accordance with the same standards and procedures set forth in
     Clause 6.4. Until the amendment to the Development Plan is approved, the
     Contractors must, to the extent possible, continue Operating Services in
     accordance with the Development Plan without giving effect to the
     amendment, except as otherwise agreed by the Affiliate.

9.4  If an amended Development Plan is rejected by the Affiliate (and, if there
     is review by an independent expert, such independent expert confirms such
     rejection), then the Contractors may, at their option;

     (i)   continue operations based on the Development Plan without giving
           effect to the amendment, unless amendment was required under Clause
           9.1;

     (ii)  submit a revised amendment to the Development Plan; or

     (iii) relinquish their rights under this Agreement with respect to the
           relevant Field in accordance with the requirements of Clause 20.4.

     If the Contractors do not submit a revised amendment to the Development
     Plan or notify the Affiliate of their intention to continue operations
     based on the original Development Plan within 90 days after the date of
     rejection by the Affiliate (or within 90 days of the date of the
     independent expert's determination), then the Contractors will be deemed
     to have relinquished their rights under this Agreement with respect to the
     relevant Field in accordance with the requirements of Clause 20.4.



                                       26
<PAGE>   30
                                                                   BOQUERON AREA


                                       X

                                  THE OPERATOR

10.1 (a) The Contractors hereby designate the Operator to carry out and execute
     all activities involved in the provision of the Operating Services on
     behalf of all of the Contractors, in accordance with this Agreement and
     the relevant Development Plans, Annual Work Programs and Budgets and
     Exploration Activities. The Operator shall be responsible for the full and
     timely performance of all obligations of the Contractors under this
     Agreement with respect to any Field or Exploration Activity for which it
     is Operator, except the obligations set forth in Clauses XXV and XXVII.
     This Clause shall not relieve any Contractor from any of its obligations
     under this Agreement

     (b) No later than 60 days after the execution of this Agreement, the
     Operator shall sign an accession agreement in the form of Annex G hereto,
     and upon such signature the Operator shall become a Party to this
     Agreement with no further action on the part of any other Party.
     Concurrently with the signature of the accession agreement, the Operator
     shall deliver to the Affiliate a guarantee from UNION TEXAS PETROLEUM
     HOLDINGS, INC. (the "Operator Guarantor") of the obligations of the
     Operator hereunder in the form attached hereto as Annex J. Except as
     otherwise approved by the Affiliate, no physical operations may be
     conducted by the Contractors hereunder prior to the signature of such
     accession agreement and the delivery to the Affiliate of such guarantee.

10.2 Following the first anniversary of the Effective Date, the Contractors may
     nominate a Person other than the original Operator to act as Operator with
     respect to any Field, or to implement any Exploration Activity; provided
     that such Person can demonstrate adequate experience, qualifications and
     financial capacity. The Person so nominated must be a Contractor or an
     Associated Entity of a Contractor. Such nomination is subject to approval
     by the Affiliate pursuant to Clause 5.2. Upon such approval, the execution
     by such other Person of an accession agreement substantially in the form of
     Annex G and, if required by the Affiliate, the execution by an Associated
     Entity of such other Person of a guarantee in the form of Annex J, such
     other Person shall be appointed as Operator for the applicable Field or
     Exploration Activity, and the original Operator shall cease to be the
     Operator with respect thereto. The Person appointed as Operator shall, with
     respect to such Field or Exploration Activity, perform all of the
     obligations and undertake all of the responsibilities of the Operator set
     forth in this Agreement.

10.3 The Operator or an Associated Entity of the Operator shall at all times
     maintain a Participation of at least 30% in the Initial Field and in each
     other Field (or Exploration Activity) as to which it acts as Operator (or
     27%, if EPIC takes a 10% Participation in such Field or Exploration
     Activity). The Contractors shall make and maintain at all times such
     arrangements among themselves for such transfers of Participations as may
     be necessary to ensure compliance with this minimum Participation
     requirement in the event




                                       27
<PAGE>   31
                                                                   BOQUERON AREA


     that the Operator is removed or resigns or in the event that a separate
     Operator is appointed for any Field (or Exploration Activity).

     No voting securities of an Operator whose obligations under the Agreement
     are guaranteed by another Person as a condition of its acting as Operator
     may be owned, held or pledged, directly or indirectly, by or to any Person
     other than a Contractor or the Associated Entity of a Contractor, without
     the prior approval of the Affiliate in its discretion. For this purpose,
     "voting securities" shall include all shares or equivalent interests
     having a right to vote with respect to the management of the Person
     concerned, together with any options, warrants, securities, instruments,
     indebtedness or other rights that are at any time exercisable for or
     convertible or exchangeable into such shares or equivalent interests and
     any proxy or power to vote any such shares or equivalent interests.

10.4 The Operator with respect to any Field may resign as Operator at any time
     by so notifying the other Parties at least ninety (90) days prior to the
     effective date of such resignation, except that no such resignation shall
     become effective except as set forth in Clause 10.8(a), and no such
     resignation may become effective before the first anniversary of the
     Effective Date.

10.5 The Operator with respect to any Field shall be removed as Operator upon
     receipt of notice from any other Party if:

     (a)  An order is made by a court or an effective resolution is passed for
          the reorganization under any bankruptcy law, dissolution, liquidation,
          or winding up of the Operator or Operator Guarantor, which order shall
          not have been vacated, discharged, stayed or bonded pending appeal
          within sixty (60) days from the entry thereof;

     (b)  The Operator or such Operator Guarantor dissolves, liquidates or
          terminates its existence;

     (c)  The Operator or such Operator Guarantor becomes insolvent, bankrupt
          or makes an assignment for the benefit of creditors;

     (d)  A receiver is appointed for a substantial part of the Operator's
          assets or those of such Operator Guarantor; or

     (e)  The Operator or such Operator Guarantor commences a voluntary
          receivership, bankruptcy, insolvency, dissolution, liquidation,
          reorganization or similar proceeding.

10.6 The Operator with respect to any Field may be removed by the Affiliate if
     the Operator has committed a material breach of this Agreement and has
     failed to cure that breach within ninety (90) days of receipt of a notice
     from the Affiliate detailing the alleged breach.



                                       28
<PAGE>   32
                                                                  BOQUERON AREA


10.7     Following the resignation or removal of an Operator pursuant to Clause
         10.4, 10.5 or 10.6, the Contractors shall meet as soon as possible to
         nominate a replacement Operator that meets the requirements of Clauses
         10.2 and 10.3, and shall present such nomination to the Affiliate for
         approval.  Notwithstanding the foregoing, in the event the Operator
         disputes commission of or failure to rectify a material breach alleged
         pursuant to Clause 10.6 and proceedings are initiated pursuant to
         Clause 23.2, no permanent replacement Operator may be appointed
         pending the conclusion or abandonment of such proceedings but the
         Contractors may, with the approval of the Affiliate as provided in
         Clause 10.2, designate one of the Contractors (or its Associated
         Entity) as interim Operator pending the conclusion of such
         proceedings.  The Affiliate shall have no liability to the original
         Operator in the event that it is replaced in accordance with the
         preceding sentence.

10.8     (a)      No resignation of an Operator may become effective, nor may
                  any replacement Operator begin providing Operating Services
                  following the resignation or removal of the previous Operator,
                  until such time as the replacement Operator has been nominated
                  by the Contractors and approved by the Affiliate.  Upon such
                  approval, the execution by the successor Operator of an
                  accession agreement substantially in the form of Annex G and,
                  if required by the Affiliate, the execution by an Associated
                  Entity of such successor Operator of a guarantee in the form
                  of Annex J, the successor Operator shall succeed to all
                  duties, rights and authority prescribed for the Operator, and
                  the former Operator shall transfer to the replacement Operator
                  custody of all property used in the provision of the Operating
                  Services, books of account, records and other documents
                  maintained by the Operator pertaining to the Area and to the
                  Operating Services.

         (b)      Upon delivery of the above-described property and data by the
                  former Operator, whether in the event of resignation or
                  removal, the former Operator shall be released and discharged
                  from all obligations and liabilities as Operator arising or
                  accruing after such date, but shall not be released from
                  obligations and liabilities arising or accruing prior to such
                  date or for any acts, occurrences or circumstances taking
                  place or existing prior to such date.

         (c)      The Contractors acknowledge that the Affiliate may, as a
                  condition to granting approval of the appointment of a new
                  Operator for the entire Area or for any Field or Exploration
                  Activity, require, among other things, that the new Operator
                  and the original Operator agree to reasonable measures to
                  coordinate reporting and other administrative matters relating
                  to this Agreement, and that an audit or inventory be conducted
                  as of approximately the time operations are transferred to the
                  new Operator.  The costs of such audit or inventory shall be
                  paid by the Contractors and included in the calculation of the
                  Service Fee, except that in the event of removal of the
                  Operator pursuant to Clause 10.6, such costs shall be paid by
                  the outgoing Operator or the Contractors and shall not be
                  included in the calculation of the Service Fee.




                                       29
<PAGE>   33
                                                                 BOQUERON AREA

                                       XI

                         CONDUCT OF OPERATING SERVICES

11.1  (a) All operations and activities relating to the provision of the 
      Operating Services shall be carried out by the Operator on behalf of the
      Contractors in accordance with:

      (i)   The Laws and Decisions of competent bodies of the Republic of
            Venezuela;

      (ii)  The specific requirements of this Agreement, the Development
            Plans, the Annual Work Programs and Budgets, Exploration Activities
            and the decisions of the Affiliate made pursuant to Clause 5.2;

      (iii) The collective bargaining agreements of the Affiliate relating
            to the oil industry, to the extent applicable; and

      (iv)  International Oil Industry Standards.

      (b) The Contractors shall apply for all permits required by Venezuelan Law
      and Decisions in order to permit the Contractors to provide the Operating
      Services. The Affiliate will cooperate with the Contractors in obtaining
      and maintaining such permits in force and will take all reasonable steps
      that may be requested by the Contractors to cause the issuance of such
      permits, including making application in its own name where application in
      the name of the Contractors or Operator is not possible. The Contractors
      may at their option, by notice to the Affiliate, suspend any Operation
      Period if:
        
      (i)   operations in all or any portion of the Area or the relevant Field
            are substantially impeded for a period of at least sixty (60) days
            due to the absence of a permit required under Venezuelan Law and
            Decisions for such operations; and
     
      (ii)  the Contractors have taken and are continuing to take
            reasonable measures to obtain such permit in accordance with 
            relevant Law and Decisions (including without limitation submitting
            all documents and information to relevant governmental authorities
            that are reasonably capable of submission at the relevant time).
       
      During the suspension, all operations in the Area or the relevant Field
      must be discontinued, except that activities necessary or useful to obtain
      the relevant permit may continue. Any such suspension will be lifted
      either (i) at the option of the Contractors or (ii) if the Contractors
      fail to continue to take reasonable measures to obtain the relevant
      permit, at the Affiliate's option. The relevant time period will
      recommence upon the lifting of the suspension. Time lapsed during the
      suspension will not count against the relevant time period.

11.2  (a) The Affiliate shall allow the Operator to use free of charge in
      activities relating to the Operating Services all of its rights to the 
      use of land, rights of way and rights of passage, water rights, and other
      rights of any nature whatsoever relating to the Area and upstream of the 




                                         30

<PAGE>   34
                                                                   BOQUERON AREA


         Delivery Point (other than rights to fixed assets, which are subject to
         Clause XII), until the termination of this Agreement with respect to
         the Area in accordance with Clause XIX or Clause XX. The Operator shall
         be entitled to use such rights solely in connection with activities
         relating to the Operating Services, and may not use them for any other
         purpose or transfer or otherwise dispose of such rights in any manner
         without the prior consent of the Affiliate. Such rights in respect of
         activities relating to the Operating Services are granted to the
         Operator with respect to the Area on an exclusive basis, subject to
         Clause 11.3. However, in no event will the exercise of such rights by
         the operator imply any assignment of title on the part of the
         Affiliate, nor will it deprive the Affiliate of the use of such rights
         for purposes unrelated to the activities contemplated in this Agreement
         in a manner that will not materially interfere with such activities.
         The Affiliate shall provide reasonable assistance to the Operator upon
         request in securing such rights to facilitate the orderly provision of
         the Operating Services.

         (b) In order to permit the Contractors to continue the Baseline
         Production, the Affiliate shall be obligated to supply to the
         Contractors:

              (i) Natural Gas at the appropriate Receipt Point, in the volumes
              and at the pressure used by the Affiliate as of the Takeover Date
              for purposes of gas lift in connection with the Baseline
              Production (provided that the Contractors will be required to
              return to the Affiliate at the relevant Delivery Point at least
              95% of the volume of Natural Gas so provided);

              (ii) electric power at the appropriate Receipt Point in the
              amounts used by the Affiliate as of the Takeover Date in
              connection with the Baseline Production; and

              (iii) water at the appropriate Receipt Point in the volumes and at
              the pressure used by the Affiliate as of the Takeover Date for
              purposes of water injection in connection with the Baseline
              Production;

         in each case, (1) at prices that shall be no higher than the
         Affiliate's standard tariff for the service concerned or, if the
         Affiliate has no standard tariff, a reasonable price to be negotiated
         between the Affiliate and the Contractors, and (2) subject to
         reductions in such supply to the extent that such supply is no longer
         necessary to maintain the Baseline Production. In each case, usage as
         of the Takeover Date shall be average usage as measured during the
         transition period pursuant to Clause 11.8.

11.3     In the event that any activities proposed by the Operator or the
         Affiliate in the Area or in any areas adjacent to the Area (unrelated
         to the Operating Services, in the case of proposed activities of the
         Affiliate in the Area) conflict with or may conflict with any existing
         or proposed activities of the other, the Operator and the Affiliate
         shall attempt to develop a plan to allow both parties to conduct their
         activities without interference with one another; provided that, in the
         absence of agreement on such a plan, the following priorities will
         apply;

         (i)  existing activities and activities of the Contractors included in
              an approved Annual Work Plan and Budget will have priority over
              proposed activities; and 


                                       31
<PAGE>   35
                                                                  BOQUERON AREA


      (ii) otherwise, the Affiliate's proposed activities will have priority.

      In any event, the Affiliate will give the Operator at least 90 days
      notice of any planned activities that may conflict with activities of the 
      Operator in the Area. In no event may the Affiliate's activities in the
      Area, taken as a whole, be so extensive as to interfere with the 
      Contractor's practical ability to conduct the activities contemplated by 
      this Agreement (including, without limitation, the Contractors' right to 
      conduct Exploration Activities).

11.4  An object of this Agreement is for the Contractors to conduct their 
      activities in the most cost effective manner, to the extent consistent
      with the work objectives and standards that the Contractors are to meet. 
      The Contractors will be required to provide reports to the Affiliate
      with respect to costs incurred in connection with operations under this 
      Agreement, in accordance with the Uniform Reporting System. The Affiliate 
      will review the reports with a view to comparing the cost efficiency of 
      contractors conducting activities in different areas that are subject to 
      similar operating service agreements. If the Affiliate determines that
      the Contractors are incurring Chargeable Expenditures that are
      significantly above the level of other contractors for similar
      activities, the Affiliate may require that the Contractors meet with the
      Affiliate to explain the level of their Chargeable Expenditures and
      present a plan for cost reductions.

11.5  All contracts entered into by the Operator in connection with the
      provision of the Operating Services shall be consistent with the
      contracting policies adopted under this Agreement. All contracts or other
      arrangements for the furnishing of goods or services by, or the provision
      of goods or services to, the Operator, a Contractor or any Associated
      Entity of the Operator or a Contractor shall be on terms that would be no
      less favorable to the Operator or such Contractor than the terms that
      could reasonably be obtained in respect of a similar contract or
      arrangement from third parties, unaffiliated with the Operator or any
      Contractor, that regularly provide such goods and services on
      international markets or in Venezuela.

11.6  The Operator will be required to contract for any required goods or 
      services in such a manner as to ensure that it obtains the most 
      advantageous cost in keeping with the objectives of this Agreement, and
      to take into account both quality as well as delivery time for such goods
      or services. To the extent efficient, practicable and likely to result
      in the most advantageous contracting terms, contracts shall be awarded
      on the basis of competitive bids. In cases where there is a supply of
      both Venezuelan as well as non-Venezuelan goods or services (including
      goods or services available from the Affiliate), the participation of
      such Venezuelan goods or services in the bidding or contracting process
      must be assured, and when such Venezuelan goods or services are
      equivalent in cost, quality and delivery time to the non-Venezuelan goods
      or services, the Operator will acquire such Venezuelan goods or
      services. In any event, in order to guarantee the optimal quality of the
      goods or services acquired, any non-Venezuelan supplier of goods or
      services must comply with the same requirements as are imposed on any
      Venezuelan supplier of goods or services. For the purposes of this
      clause, Venezuelan goods or services will be understood to mean those
      goods or services supplied by offices or plants that provide such goods
      or services in Venezuela.



                                       32
<PAGE>   36
                                                                   BOQUERON AREA


11.7   (a)     The Operator and the Contractors shall be responsible for
               engaging employees, subcontractors, agents and other
               representatives in the course of the Operating Services, and
               shall be responsible for all injuries (or death) of their
               employees and those of such subcontractors, agents and other
               representatives and for all loss or damage to the property of
               such employees, subcontractors, agents and other representatives.
               The Operator and the Contractors shall be exclusively responsible
               for the performance of the obligations assumed in respect of
               employees performing the Operating Services by virtue of the
               Organic Labor Law, the Social Security Law, the INCE Law, the
               regulations adopted under any such law, the provisions of any
               collective bargaining or other labor agreements generally
               applicable to the oil industry in Venezuela, and any other law,
               regulation or other norm relating to the relations between
               employers and employees. Neither the Operator nor the Contractors
               will have any obligation to engage any current employees of the
               Affiliate or of its Associated Entities, subcontractors or
               agents.

       (b)     In the event that the Operator experiences strikes or other labor
               disputes with its employees, the Operator shall keep the
               Affiliate informed as to the results of the Operator's efforts to
               resolve such disputes. If the Affiliate informs the Operator that
               any such labor dispute has resulted, or creates a significant
               risk of resulting, in collective action being taken by the
               Affiliate's employees in support of the Operator's employees,
               then the Operator shall consult with the Affiliate with a view to
               protecting adequately the interests of both the Operator and the
               Affiliate, subject to the Operator's obligations to conduct
               operations hereunder in accordance with the standards set forth
               in Clause 11.1.

11.8   (a)     No later than 15 days following the Effective Date, the Operator
       (or, if the Operator has not yet signed the Agreement pursuant to Clause
       10.1, one of the Contractors) shall submit to the Affiliate:

       (i)     a description and timetable of the activities that the
               Contractors propose to conduct in the Area in order to prepare
               the Development Plan for the Initial Field and the environmental
               audit required by Clause 22.3, which activities may include
               visual inspection and testing of surface facilities that do not
               unreasonably interfere with normal operations, but may not
               include any drilling, seismic or other subsurface activities; and

       (ii)    an interim budget indicating the Chargeable Expenditures that the
               Contractors expect to incur during the period between the
               Effective Date and the Takeover Date, which interim budget shall
               be revised from time to time to reflect any significant
               additional Chargeable Expenditures that the Contractors expect to
               incur.

       Except as provided above or as otherwise approved by the Affiliate, the
       Operator may not commence physical operations in the Area until the
       Affiliate has approved the Development Plan and the first Annual Work
       Program and Budget for the Initial Field.




                                       33



<PAGE>   37
                                                                   BOQUERON AREA


         (b)   In addition to the matters required by Clause 6.2, the
         Development Plan for the Initial Field shall include a plan for the
         transfer of operations from the Affiliate to the Operator, describing
         inter alia:

         (i)   all significant transition arrangements;

         (ii)  the operations to be conducted in common on a trial basis by
               both the Operator and the Affiliate, and the duration of such
               operations in common, (which operations in common may commence
               prior to approval of the Development Plan, if the Affiliate
               agrees);

         (iii) plans for the sharing of facilities and the coordination of
               activities with the Affiliate, to the extent then known, in
               accordance with Clauses 11.9 and 12.3; and 

         (iv)  the proposed Takeover Date.

          (c)  The "Initial Baseline Production" for the first Quarter of the
          Operation Period will be determined as follows:

          "Initial Baseline Production" will be equal to the arithmetic mean of
          the actual volumes of Production of all of the wells in the Initial
          Field for the three months in the immediately preceding Quarter, as
          reported in the official monthly Production reports submitted by the
          Affiliate to the Venezuelan Ministry of Energy and Mines, and then
          reduced by the Baseline Production Decline Factor for one Quarter in
          the manner provided in the definition of "Baseline Production"
          (assuming that AP, for this purpose equals such mean of the actual
          Production of such wells). All volumes of Production shall be measured
          in a manner consistent with past practice and corrected to a water
          content of 0.1% in the case of Liquid Hydrocarbons containing more
          than 0.1% water. Except as provided in the following paragraph, the
          volumes of Production reported on such official reports for the three
          months in such immediately preceding Quarter will be conclusive and
          binding in determining Initial Baseline Production. In addition, under
          no circumstances, will the amount of the Baseline Production Decline
          Factor be subject to review, discussion or modification.

          In the event that major maintenance to facilities results in a
          significant curtailment or reduction of the Production of any wells in
          the Initial Field during any month in such immediately preceding
          Quarter, then for purposes of determining the total, average
          Production of the Initial Field in such Quarter, the average
          Production of such wells during such Quarter shall be determined as
          follows:

               (i)  if the curtailment or reduction affects Production from such
                    wells in only one month in such Quarter, then the average
                    Production from such wells shall be based on the actual
                    Production from such wells in the two unaffected months as
                    reported in such official monthly reports, extrapolating to
                    account for the affected month on the basis of the two
                    unaffected months; and 

              (ii)  if the curtailment or reduction affects Production from such
                    wells in more than one month in such Quarter, then the 
                    average Production from such wells shall be based




                                       34


                         
<PAGE>   38
                                                                   BOQUERON AREA

                  on the actual Production of such wells during the most recent
                  three-month period that is not affected by such maintenance,
                  as reported in such official monthly reports, and adjusted by
                  the Baseline Production Decline Factor through such
                  immediately preceding Quarter.

         For information purposes only, the Affiliate will provide the
         Contractors with such official monthly Production reports for all
         wells in the Initial Field, for the three months preceding the
         Effective Date and for each month thereafter as it becomes available
         until the Takeover Date.  The Affiliate shall also provide the
         Contractors with a description of its Production measurement, testing
         and allocation procedures for the Initial Field. The Contractors may
         observe the Affiliate in the conduct of measurements of the Production
         of such wells.

         (d)     Expenses incurred by the Contractors after the Effective Date
         and prior to the Takeover Date will be recoverable as part of the
         Service Fee for the Initial Field to the extent that they (i)
         constitute Chargeable Expenditures allocable to the Initial Field in
         accordance with the Accounting Procedures; (ii) are included in the
         interim budget submitted in accordance with Clause 11.8(a), as amended
         from time to time, and (iii) are included in the Development Plan and
         initial Annual Work Program and Budget as subsequently approved.

11.9     The Operator shall coordinate its activities in providing the
         Operating Services with the activities conducted by the Affiliate in
         and around the Area.  In particular:

         (a)     The Operator shall ensure that its automation and information
                 systems are capable of interfacing with those of the Affiliate;

         (b)     The Contractors and the Operator shall endeavor to enter into
                 agreements or arrangements with the Affiliate and its
                 Associated Entities or other parties to reduce the costs of the
                 Operating Services or to optimize operations relating to the
                 Operating Services by joining with such other parties in the
                 construction, funding, operation and/or use of assets and
                 facilities relating to the Operating Services; and

         (c)     The Operator shall endeavor to utilize equipment in connection
                 with the Operating Services that is consistent with the norms
                 and standards of the Affiliate, to the extent consistent
                 with the Operator's obligations under this Agreement (including
                 without limitation the Operator's obligations under Clause
                 11.4).

         The Affiliate shall provide the Operator with such information as the
         Operator may reasonably request to permit the Operator to comply with
         its obligations under this Clause 11.9.

11.10    (a)     (i)  Prior to commencing any Operating Services and for so
                 long as any Operating Services are conducted, the Contractors
                 and the Operator will be required to provide the Affiliate
                 with satisfactory evidence:

                             (1)(A)  that they have obtained and are maintaining
                 in force all-risk construction, property and casualty, third
                 party liability, well control and other insurance policies from
                 reputable insurance companies with regard to the Operating
                 Services, in each case covering such risks and in such amounts
                 as the




                                       35

         
<PAGE>   39
                                                                  BOQUERON AREA


      Affiliate notifies to the Contractors that it would have obtained in the
      ordinary course of business had it decided to perform the Operating
      Services directly, and (B) that they have adequate financial capacity to
      cover any risks that are subject to deductibles under such insurance
      policies, that they propose to self-insure; or

          (2)  that they have the financial capacity to self-insure any such
      risks for which they do not obtain insurance.

      Subject to the following paragraph, the cost of any premiums in respect 
      of such insurance policies (including premiums paid to captive insurance
      companies and a customary and reasonable charge in respect of any self-
      insurance) may be included in the calculation of the Service Fee pursuant
      to the Accounting Procedures. The Contractors and Operator may obtain
      additional insurance of types or in excess amounts beyond the 
      requirements of this Clause, but the premiums in respect of such 
      additional insurance may not be included in the calculation of the 
      Service Fee pursuant to the Accounting Procedures.

      (ii) The Affiliate may, but shall not be obligated to, offer to obtain or
      continue some or all of such insurance policies from a reputable insurance
      company or companies on behalf of the Contractors and to cause the
      Contractors and the Operator to be listed as co-insured parties on any
      such insurance policy (with a waiver by the insurer of any right of
      subrogation in respect of the co-insured). The Affiliate may charge the
      Contractors and the Operator a premium for any such insurance, which
      premium may then be included in the calculation of the Service Fee. The
      Contractors and the Operator shall not be required to accept the
      Affiliate's offer to obtain or continue any such insurance and may obtain
      the necessary insurance elsewhere; provided that, in this case, the
      amount of the premiums with respect to such insurance that may be included
      in the calculation of the Service Fee may not exceed the premium offered
      by the Affiliate for such insurance and the Contractor or Operator
      concerned shall offer to cause the Affiliate to be listed as a co-insured
      party on such alternative insurance policy (with a waiver by the insurer
      of any right of subrogation in respect of the co-insured).

      (iii) Prior to approval of the Development Plan for the Initial Field, 
      the Affiliate shall provide the Contractors with a schedule showing (1)
      the types and amounts of insurance that will be required under this 
      Clause 11.10(a),(2) the extent to which the Affiliate is offering to 
      obtain some or all of such insurance on behalf of the Contractors 
      (including a description of any deductibles and policy limits), and (3) 
      the premiums, if any, that the Affiliate proposes to charge for any such
      insurance that it obtains on behalf of the Contractors and Operator. The 
      Affiliate may in its discretion and from time to time amend such schedule
      and the scope or cost of such insurance coverage, upon 30 days prior 
      written notice.

(b)   In the event that the Operator obtains insurance proceeds following its 
      submission of a claim under any of the insurance policies of the 
      Affiliate referred to in Clause



                                       36

      
      
<PAGE>   40
                                                                  BOQUERON AREA


      11.10(a)(ii) where it is listed as a co-insured, the Operator shall 
      either (i) apply any such proceeds to remedy the loss or damage in 
      respect of which the insurance claim was paid, and promptly pay over any
      remaining balance in respect of such proceeds to the Affiliate, or (ii)
      notify the Affiliate that it does not intend to remedy such loss or 
      damage and promptly pay over the entirety of such proceeds to the 
      Affiliate. The Operator shall make the determination as to whether to 
      apply any insurance proceeds to remedy the relevant loss or damage in
      accordance with International Oil Industry Standards.

(c)   In the event the Affiliate obtains insurance proceeds relating to losses
      sustained in connection with the Operating Services following its 
      submission of a claim under any of the insurance policies of the 
      Affiliate referred to in Clause 11.10(a)(ii), the Affiliate shall notify
      the Operator to such effect, and within 90 days of the Operator's receipt
      of such notice, the Operator may notify the Affiliate that the Operator 
      intends to remedy the loss or damage in respect of which such payment was 
      made. Promptly following receipt of such notice from the Operator, the 
      Affiliate shall pay over to the Operator the amount of such payment for 
      application to such remediation. In the event that the amount paid to the 
      Operator exceeds the amount necessary to effect such remediation, the 
      Operator shall pay over any remaining balance to the Affiliate.

(d)   The Contractors shall be responsible for remedying any loss or damage to
      the facilities, properties, equipment and other assets of the Affiliate 
      (other than normal wear and tear in the ordinary course) that result from 
      activities conducted pursuant to this Agreement. The Contractors shall 
      make up any amount necessary for such remediation that is not fully 
      covered by the cash proceeds from any insurance policies carried pursuant
      to Clause 11.10(a), including by reason of deductibles or maximum damage
      awards, and shall apply such amount to remedy the relevant loss or damage
      or shall pay such amount to the Affiliate on the same basis as insurance 
      proceeds received by the Operator are to be applied pursuant to Clause 
      11.10(b). Unless such loss or damage results from the gross negligence or
      willful misconduct of the Operator or a Contractor, the amounts spent by 
      the Contractors in remediation shall be Chargeable Expenditures.

      The Affiliate shall be responsible for remedying any loss or damage to 
      the facilities, properties, equipment and other assets of the Operator or
      Contractors that result from the separate activities of the Affiliate 
      conducted in the Area during the term of this Agreement.

(e)   The Contractors shall indemnify the Affiliate, its Associated Entities 
      and the officers, directors, employees, agents and consultants of the 
      Affiliate and its Associated Entities, from, and hold each of them 
      harmless against, any and all costs, expenses (including without 
      limitation reasonable legal costs, expenses and attorneys' fees) and 
      liabilities that arise from or are incident to claims, demands or causes
      of action of every kind and character brought by or on behalf of (1) any
      Person for damage to or loss of property or the environment, for injury 
      to, illness



                                       37
      
<PAGE>   41
                                                                   BOQUERON AREA


              or death of any Person (including without limitation any
              employee of the Contractor or the Affiliate), or for infringement
              of an patent, copyright or similar rights, in each case to the
              extent such costs, expenses and liabilities arise from or are
              based upon activities conducted pursuant to this Agreement, or
              (2) any employee of the Operator, any Contractor or any of their
              respective subcontractors or agents for compensation in respect of
              work or activities relating to performance of the Operating
              Services (except where the Affiliate or its Associated Entity is
              the subcontractor that employs such employee). Without prejudice
              to the right to indemnity hereunder, the Contractors will have the
              right to assume the defense of any such claim, demand or cause of
              action for which indemnity is sought, and the Affiliate shall not
              settle any such claim, demand or cause of action without the 
              consent of the Operator.

         (f)  The Affiliate shall indemnify the Contractors, the Operator, their
              respective Associated Entities and the respective officers,
              directors, employees, agents and consultants of the Contractors,
              the Operators and their Associated Entities, from, and hold each
              of them harmless against, any and all costs, expenses (including
              without limitation reasonable legal costs, expenses and attorneys'
              fees) and liabilities that arise from or are incident to claims,
              demands or causes of action of every kind and character brought by
              or on behalf of any Person for damage to or loss of property or
              the environment, for injury to, illness or death of any Person
              (including without limitation any employee of a Contractor, the
              Operator or the Affiliate), or for infringement of any patent,
              copyright or similar rights, in each case to the extent such
              costs, expenses and liabilities arise from or are based upon
              activities conducted by the Affiliate in the Area after the
              Takeover Date. Without prejudice to the right to indemnity
              hereunder, the Affiliate will have the right to assume the defense
              of any such claim, demand or cause of action for which indemnity
              is sought, and the Contractors of Operator shall not settle any
              such claim, demand or cause of action without the consent of the
              Affiliate.
 

                                      XII

                        TITLE TO AND USE OF FIXED ASSETS

12.1     The Affiliate shall have exclusive title to (or, in the case of capital
         leases, shall be the named lessee of) all facilities, properties,
         equipment and other assets used by the Contractors to perform Operating
         Services hereunder, except for:
 
         (i)  immovable assets that are located inside or outside the Area whose
              costs of construction or acquisition are not included as
              Chargeable Expenditures in the calculation of the Service Fee;
  
         (ii) assets that are leased by the Contractors for use in connection
              with the Operating Services under leases that would not
              constitute capital leases under international accounting
              standards;


                                       38
<PAGE>   42
                                                                BOQUERON AREA


      (iii)     information, technology and data of the type referred to in
                Clause XXIV, title to which shall be governed by Clause XXIV;

      (iv)      movable assets introduced into the Area by the Contractors on a
                temporary basis to be used for a specific purpose; and

      (v)       other assets that, for reasons of economy or practical
                convenience, the Affiliate may agree with the Operator shall be
                owned by the Contractors.

      The Contractors shall not purchase or construct any real estate for the
      account of the Affiliate as provided above, without giving the Affiliate
      at least 60 days prior notice and discussing with the Affiliate the
      availability and relative cost of opportunities to rent the necessary real
      estate. If (a) such real estate is available for rental, (b) the Affiliate
      indicates that it would prefer rental to purchase and (c) there is no
      significant cost savings associated with purchase, the Contractors shall
      rent and not purchase such real estate.

12.2  All assets constructed or acquired by the Contractors in respect of which
      title is to vest in the Affiliate shall be deemed to have been constructed
      or acquired by the Contractors in the name and for the account of the
      Affiliate. The payment by the Contractors of the construction or
      acquisition costs of such assets shall be considered a non-recourse
      advance from the Contractors to the Affiliate, which shall be repaid
      solely through the payment by the Affiliate to the Contractors of the
      Service Fee, and which shall be amortized based on the principles
      specified in Article VI of the Accounting Procedures.

12.3  (a) Subject to the following sentence, the Operator shall have the
      exclusive right to use all assets constructed or acquired by the
      Contractors for the account of the Affiliate pursuant to Clause 12.2 free
      of charge for purposes relating to the provision of the Operating
      Services. If, in light of the relevant Development Plan, any such assets
      are expected to have significant capacity for an extended period of time
      that will not be used for the provision of the Operating Services and can
      be made available to the Affiliate without unreasonable interference with
      the Operating Services, the Operator shall, if requested, make such unused
      capacity available to the Affiliate free of charge except for payment of a
      fair and reasonable fee for operating and maintaining the asset concerned.
      If the Operator later wishes to use some or all of such previously unused
      capacity for the provision of Operating Services, it shall so notify the
      Affiliate and the Affiliate shall relinquish the capacity concerned no
      later than six months following the receipt of such notice.

      (b) Subject to Clause XXI, the Contractors shall have the right to use 
      free of charge, in connection with the Operating Services, all existing
      wells in the Area, the flow lines between such wells and gathering
      stations and all electricity lines, gas lines and water lines between the
      appropriate Receipt Point and such wells. In addition, Annex N lists
      certain other fixed assets in the Area or outside the Area that are
      appropriate for the Transportation and Handling of Hydrocarbons from the
      Area to the Delivery Point, that were constructed or acquired by the
      Affiliate prior to the Effective Date for use in connection with the
      discovery, appraisal or exploitation of the Initial Field or any other
      Hydrocarbon-bearing structure in the Area that is known to the Affiliate
      as of the 






                                       39

<PAGE>   43
                                                                   BOQUERON AREA


          Effective Date. The Operator shall have the right to use the assets
          listed thereon free of charge. The Operator shall operate all assets
          listed on Annex N. If the Operator wishes to use any assets other than
          as described above, it must obtain the Affiliate's consent and agree
          with the Affiliate on the terms on which the Operator may obtain the
          right to use such assets. The Affiliate may decline to grant such
          consent in its discretion.

          The Contractors shall have no obligation to use any such wells or flow
          lines or the assets listed on Annex N; provided that, except as
          specifically provided in Clause 22.5, the non-use of any such assets
          shall in no way affect or reduce the Initial Baseline Production or
          the Baseline Production and any replacement of such assets shall be
          subject to the requirements of Clause 11.4 and of Article IV of the
          Accounting Procedures that all Chargeable Expenditures hereunder be
          both reasonable and necessary.

          Except as may otherwise be specifically agreed between the Contractors
          and the Affiliate, all such wells, flow lines, assets listed on Annex
          N and any other facilities, installations, equipment, materials or
          other assets that the Affiliate may from time to time make available
          to the Contractors are offered and used "as is, where is", and neither
          the Affiliate nor any of its Associated Entities makes any
          representation or warranty, express or implied, as to the condition of
          any such assets, their suitability or fitness for their current use or
          any other use, or their compliance with applicable Law or Decisions,
          or shall have any liability resulting from their use in connection
          with the Operating Services.

          Without limiting the generality of the preceding paragraph, the
          Affiliate agrees that, between the Effective Date and the Takeover
          Date, the Affiliate will operate the Area only in the ordinary course,
          will not materially change the nature or extent of its activities in
          the Area or dispose of or remove any material quantity of assets
          covered by this Clause 12.3(b), will substantially maintain and
          continue regular, scheduled programs of maintenance with respect to
          such assets, and in general will use reasonable efforts to preserve
          the existing activities and assets in the Area; provided that nothing
          in this paragraph shall require the Affiliate to repair or replace any
          well, flow line or other asset that may be damaged or lost, regardless
          of the cause of such damage or loss.

          (c) Neither the Operator nor the Contractors shall have the right to
          use any assets described in this Clause 12.3 for any purpose other
          than for use directly in connection with the Operating Services.

12.4      The Operator shall safeguard and maintain in good condition, subject
          to normal wear and tear, all assets that the Operator uses in
          accordance with Clause 12.3. The Operator shall not sell, lease or
          otherwise dispose of any asset that the Operator uses in accordance
          with Clause 12.3 without the prior approval of the Affiliate, which
          approval shall be in the Affiliate's discretion.

12.5      Upon the termination of the Operation Period in respect of any Field,
          all assets used with respect to such Field that the Operator uses in
          accordance with Clause 12.3 shall be transferred to the control of the
          Affiliate, except that:




                                       40
<PAGE>   44
                                                                   BOQUERON AREA


         (i)   assets and facilities that are to be removed pursuant to Clause
               21.1 shall either be transferred to the control of the Affiliate
               following removal or disposed of as scrap, as requested by the
               Affiliate; and

         (ii)  assets used with respect to a Field that are not necessary for
               the continuation of Production at such Field and that can be
               moved and used at another Field may, with the Affiliate's
               approval under Clause 12.4, be moved to such other Field, in
               which case (1) the transferee Field shall pay a fair and
               reasonable purchase price or fee to the Affiliate for such
               assets, and (2) such assets shall be transferred to the control
               of the Affiliate or removed, as applicable, at the end of the
               Operation Period for such other Field.
 
12.6      All revenues of whatever nature received in cash or in kind from the
          use, sale or other disposal of any assets owned by the Affiliate
          pursuant to this Clause XII or in connection with the provision of
          Operating Services (net of the reasonable expenses incurred directly
          in connection with generating such revenues, such as fees or similar
          expenses) shall be for the account of the Affiliate and, if received
          by any Contractor, shall be paid to the Affiliate promptly upon
          receipt, including without limitation:

         (i)   revenues from the sale, lease, licensing or other use of such
               assets or products of such assets, including without limitation
               pipeline facilities, storage facilities, loading and unloading
               facilities, surplus housing or office space or other
               infrastructure relating to the Operating Services;

         (ii)  the sale, lease or other disposal of materials or other
               property (whether immovable or movable) originally acquired or
               leased for use in connection with the provision of the Operating
               Services but no longer so used;

         (iii) the provision of services to third parties by the Operator or
               any Party using such assets;

         (iv)  the sale or other disposal of scrap or waste created as a result
               of the provision of the Operating Services;

         (v)   any interest or other charges received as a result of the
               deferred or late payment of any of the foregoing; and

         (vi)  any other revenue generated as proceeds of assets or property,
               the costs of which are included in the calculation of the
               Service Fee in accordance with the Accounting Procedures.




                                       41

<PAGE>   45
                                                                   BOQUERON AREA

                                      XIII
                                      
              HYDROCARBON RESERVOIRS EXTENDING OUTSIDE THE AREA

13.1      (a)  In the event that any part of a Hydrocarbon-bearing structure,
          formation or deposit for which the Contractors propose to submit a new
          Development Plan pursuant to Clause 8.4 or an amendment to an existing
          Development Plan pursuant to Clause 8.8 (or any part of any
          Hydrocarbon-bearing structure, formation or deposit that is Connected
          thereto) extends beyond the boundary of the Area, the Contractors
          shall so notify the Affiliate (unless the Connection with such part
          of a Hydrocarbon-bearing structure, formation or deposit extending
          beyond the Area boundary results exclusively from the existence of an
          Accumulation).  Thereafter, the Affiliate, assisted by the
          Contractors, shall use reasonable efforts to negotiate in good faith
          an agreement for a single development program for such
          Hydrocarbon-bearing structures, formations or deposits with any Person
          or Persons that have rights to the additional area to which they
          extend, that will enable the Contractors to provide Operating Services
          in accordance with this Agreement with respect to those parts of such
          Hydrocarbon-bearing structures, formations or deposits lying inside
          the Area.

          (b)   If the Affiliate owns the Hydrocarbon rights to the area outside
          the Area that includes such Hydrocarbon-bearing structures,
          formations or deposits, the Affiliate shall propose such a single
          development program in good faith or extend the Area to include the
          entirety of such Hydrocarbon-bearing structures, formations or
          deposits. The Affiliate shall be under no obligation to extend        
          the Area, and the Contractors shall have no right to require the
          Affiliate to do so. If the area outside the Area that includes such
          Hydrocarbon-bearing structures, formations or deposits is operated by
          a service contractor on behalf of the Affiliate, or if the
          Hydrocarbon rights to such area are owned by an Associated Entity of
          the Affiliate, the Affiliate shall endeavor to procure that such
          service contractor or Associated Entity, as the case may be, accepts
          such a single development program in good faith.

          (c)  Any such single development program shall provide for the optimum
          economic development or evaluation of the applicable
          Hydrocarbon-bearing structures, formations or deposits, without regard
          to the geographical areas in which they are located, and will enable
          the Contractors to provide the Operating Services as provided in this
          Agreement.

13.2      (a)  The Contractors must allow the Affiliate at least two years from
          the date of the notice provided in Clause 13.1 to reach agreement on a
          single development program (or to extend the boundary of the Area) as
          provided in Clause 13.1, before submitting a new Development Plan
          pursuant to Clause 8.4 or an amendment to an existing Development Plan
          pursuant to Clauses 8.8 and 9.1.

          (b)  Upon the earlier of (i) the entry into such an agreement by the
          Affiliate, the Contractors and any relevant other Person(s) (or
          extension of the Area by the Affiliate) and (ii) the expiry of such
          two-year period, the Contractors will be entitled to submit a
          Development Plan pursuant to Clause 8.4 or obligated to submit an
          amendment to an existing Development Plan pursuant to Clauses 8.8 and
          9.1, that in each case satisfies the




                                       42
  
<PAGE>   46
                                                                BOQUERON AREA

      requirements of the Agreement (except as such requirements may be modified
      with the consent of the Affiliate as a result of any agreement on a single
      development program).

      The Affiliate shall observe the same standards for approval of such
      Development Plan or amendment as are set forth respectively in Clause 8.5
      or Clauses 8.8 and 9.3, except that the Affiliate will be obliged to 
      approve any proposed Development Plan or amendment if:

      (i)      the proposed Field Boundary includes only those parts of
               Connected Hydrocarbon-bearing structures, formations or deposits
               that are located entirely inside the Area (taking into account
               any modifications of the Area boundary);

      (ii)     the Maximum Economic Rate for the proposed Field is determined
               based only on those parts of Connected Hydrocarbon-bearing
               structures, formations or deposits that are located entirely
               inside the Area (taking into account any modifications of the
               Area boundary); and

      (iii)    the production profile in the proved reserve case calls for
               Production at the lowest of (x) the Maximum Economic Rate for the
               proposed Field, (y) the aggregate of the Delivery Point
               Capacities of the different Delivery Points to which the
               Development Plan or amendment contemplates delivery of
               Hydrocarbons, and (z) the production levels contemplated by the
               agreed single development program, if any.

      In particular, if the two-year negotiation period provided above has
      expired without an agreement on a single development program (or extension
      of the Area), the Affiliate may not reject a proposed Development Plan or
      amendment to an existing Development Plan based on the absence of such an
      agreement. 

      (c) The period provided in Clause 19.2 will be extended by the shorter of
      (i) two years and (ii) the length of time following the notification
      provided in Clause 13.1 that is actually required to negotiate an
      agreement on a single development program (or extension of the Area), with
      respect to those parts of the Area that contain Hydrocarbon-bearing
      structures, formations or deposits that are covered by this Clause XIII.


                                      XIV

                             PRODUCTION CURTAILMENT

14.1  The Contractors may be required to curtail Production as a result of
      government measures adopted in implementation of Venezuela's international
      treaty commitments. Where such curtailments are required, the percentage
      curtailment applicable to Production under this Agreement shall not exceed
      the percentage level of production curtailment required of oil companies
      operating in Venezuela taken as a whole, including PDVSA's Associated
      Entities, determined in each case on the basis of available production
      capacity. For this purpose, "available production capacity" means capacity
      for the production of Hydrocarbons of the 




                                       43
<PAGE>   47
                                                                   BOQUERON AREA

         types that are subject to the relevant treaty commitment, to the
         extent such capacity is currently in production at the relevant time,
         or as to which production may reasonably be commenced within three (3)
         months from the relevant time. The available production capacity with
         respect to a Field for any relevant period shall be based on the
         planned capacity set forth in the related Development Plan, and shall
         be revised in subsequent periods based on planned capacity for such
         periods. Any curtailment in capacity shall be applied pro rata to the
         Baseline Production and the Incremental Production at the relevant
         time. Where the Contractors are unable to recoup the resulting loss by
         increasing the rate of Production to the extent necessary to recoup
         such loss, the Contractors shall be entitled to receive an extension
         of the Operation Period, sufficient in duration to allow it to produce
         the same volume it failed to produce as a result of such curtailment.


                                       XV

                     TITLE TO AND TRANSFER OF HYDROCARBONS;
                     ROYALTIES; TRANSPORTATION AND HANDLING

15.1     The Affiliate shall hold the exclusive right, title and interest to any
         Hydrocarbons produced by the Contractors pursuant to this Agreement.

15.2     The Contractors shall be authorized to produce Hydrocarbons for the
         account of the Affiliate in volumes equivalent to those specified in
         the production profiles included in the Development Plans approved by
         the Affiliate (subject in each case to the tolerances specified in
         Annex H hereto, as they may be amended from time to time).

15.3     (a)  The Contractors may at any time request an increase in the
         Delivery Point Capacity of any Delivery Point, or the designation of
         an additional Delivery Point and an associated Delivery Point Capacity
         (and quality specifications), and in connection with any such request
         may offer to construct or acquire for the Affiliate facilities for the
         Transportation and Handling of the increased volumes by the Affiliate.
         The Contractors shall provide a description of any such proposed
         facilities (including in such description a proposed construction or
         acquisition timetable) together with the submission of the request by
         the Contractors for the increase in Delivery Point Capacity or
         designation of a Delivery Point. Such request may be made in the
         original Development Plan for any Field, an amendment to a Development
         Plan or otherwise.  

         (b)   If the request involves the use of any facilities or
         infrastructure of the Affiliate (or its Associated Entities) upstream
         of the exit flange on a transfer hose from which the Hydrocarbons
         concerned can be loaded on a tanker and exported from Venezuela (an
         "Export Point"), the Affiliate may approve or reject any such request
         in its discretion. If the request (i) does not involve use of any such
         infrastructure or facilities, (ii) provides for all infrastructure and
         facilities needed for the Transportation and Handling to the Export
         Point of Hydrocarbons meeting the minimum quality standards specified
         below (or as otherwise agreed by the Affiliate in its discretion) and
         (iii) is part of a Development Plan or an amendment thereto, such
         request shall be subject to the general approval and review criteria
         applicable to Development Plans




                                       44
<PAGE>   48
                                                                   BOQUERON AREA
          
         and amendments to Development Plans under Clauses VI and IX 
         respectively. A Delivery Point at the Export Point will have unlimited
         Delivery Point Capacity.

         The minimum quality standards for Liquid Hydrocarbons delivered at an
         Export Point shall be (1) an API gravity of at least 22 degrees, (2)
         water content (determined by means of distillation) of no more than
         0.5% for Liquid Hydrocarbons with an API gravity greater than 22
         degrees and no more than 1.0% for Liquid Hydrocarbons with an API
         gravity less than or equal to 22 degrees, and (3) the other quality
         standards stated in Annex H.

         (c)   If the Affiliate approves any such request other than in the
         context of a Development Plan or amendment thereto and the request is
         accompanied by a proposal to construct or acquire additional
         facilities, the Contractors shall be obligated to construct or acquire
         such facilities for the Affiliate within the time periods described in
         the request (as such time periods may be extended with the approval of
         the Affiliate).

15.4     (a)   The Contractors shall be required to deliver all Production to
         the Affiliate at the relevant Delivery Point or Points. If the
         Contractors experience operating problems or otherwise foresee that
         the volume of Production delivered in a given month will be
         significantly less than the volume provided in the relevant
         Development Plan and Annual Work Program and Budget, the Contractors
         shall give the Affiliate prompt notice of the nature of the problem,
         the extent and duration of the expected volume shortfall, and the
         measures being undertaken to remedy the problem and shall keep the
         Affiliate informed as to the evolution of the problem.

         (b)   The Affiliate shall be required to accept from the Contractors at
         each Delivery Point all Hydrocarbons in the volumes that the
         Contractors are authorized to deliver at such Delivery Point, subject
         to limitations due to reasonable and customary maintenance and repairs
         or to operating problems with respect to the facilities concerned.

         Prior to finalization of a proposed Annual Work Program and Budget in
         accordance with Clause VII, the Affiliate shall notify the Contractors
         of the proposed timing and duration of proposed routine maintenance
         and repairs to assets and facilities, that could affect the
         Affiliate's ability to accept delivery of Production at the relevant
         Delivery Point, during the period covered by such Annual Work Program
         and Budget. The Contractors shall make due allowance for such
         maintenance and repairs in the Annual Work Program and Budget. In the
         event of a need for unscheduled maintenance or repairs or of
         unforeseen operating problems, the Affiliate shall give the
         Contractors prompt notice of the nature of the problem, the extent and
         duration of any expected curtailment of capacity, and the measures
         being undertaken to remedy the problem and shall keep the Contractors
         informed as to the evolution of the problem. In any event, the
         Affiliate shall use its reasonable best efforts to minimize the
         duration and scope of any curtailment of capacity due to maintenance
         and repairs or to operating problems. In the event of a partial
         curtailment of capacity, the curtailment shall be applied pro rata to
         all users of the facilities concerned, including the Affiliate and
         PDVSA's other Associated Entities, based on the available production
         capacity of each, determined as provided in Clause 14.1. Any
         curtailment in capacity shall be applied pro rata to the Baseline
         Production and the Incremental Production. Where the Contractors are
         unable to recoup the resulting loss by increasing the rate of
         Production to the extent necessary to recoup such loss, the


                                       45
<PAGE>   49

                                                                   BOQUERON AREA

         Contractors shall be entitled to receive an extension of the Operation
         Period, sufficient in duration to allow it to produce the same volume
         it failed to produce as a result of such curtailment.

15.5     All exploitation tax (royalty) payable pursuant to applicable
         Venezuelan law in respect of Production that the Contractor is
         authorized to realize hereunder shall be paid by the Affiliate.

15.6     In addition to the monthly production projections set forth in the
         Annual Work Program and Budget for each year, the Contractors must
         schedule delivery of Production to the Affiliate in accordance with a
         notification and delivery procedure to be established in
         accordance with the Uniform Reporting System.

15.7     The Contractors' duties will include the Transportation and Handling,
         or arranging for the Transportation and Handling, of all Hydrocarbons
         that are to be delivered to the Affiliate, from the wellhead or other
         point of extraction to the relevant Delivery Point.  Costs associated
         with the Transportation and Handling of all volumes delivered under
         this Agreement at a Delivery Point, whether in respect of construction
         of new facilities or the use of existing facilities, will be included
         in the calculation of the Service Fee, as provided in the Accounting
         Procedures.

15.8     In the event that a fiscalization point or other inspection point is
         required to be designated prior to the relevant Delivery Point in
         accordance with relevant Venezuelan laws and regulations or the
         requirements of the Ministry of Energy and Mines, such designation and
         any measurement or inspection at such fiscalization point or other
         inspection point shall not be deemed to constitute delivery of the
         relevant Hydrocarbons by the Contractor to the Affiliate or acceptance
         of such Hydrocarbons or the quality of such Hydrocarbons by the
         Affiliate. Such delivery and acceptance, and transfer of risk of loss,
         shall occur only at the relevant Delivery Point.

                                      XVI

                          GAS DISPOSITION AND HANDLING

16.1     In the event that the Contractors make a Free Gas Discovery, they will
         have the exclusive right for a period of 36 months following such Free
         Gas Discovery to negotiate an alternative arrangement with the
         Affiliate for the exploitation of such Free Gas Discovery. If a Free
         Gas Discovery is made less than 36 months prior to the last date on
         which this Agreement may terminate with respect to the areas in which
         the Free Gas Discovery is located, this Agreement will be extended
         with respect to such Free Gas Discovery until the expiration of 36
         months after the Free Gas Discovery is made.

16.2     Unless otherwise agreed, Associated Gas shall be used and disposed of
         in accordance with the following principles:


                                       46
<PAGE>   50
                                                                BOQUERON AREA

(i)      The Contractors shall be obligated to deliver to the Affiliate, and
         the Affiliate shall be obligated to accept, at the relevant Delivery
         Point, the volume of Associated Gas that is related to the Baseline
         Production ("Baseline Gas"), as determined on the basis of the gas to
         oil ratio for all Production from the Initial Field at the time
         concerned; provided that, if the Affiliate is using Baseline Gas in
         connection with Production from the Initial Field as of the Takeover
         Date, the Contractors will have the right to use such volume of
         Baseline Gas as is necessary to continue the Baseline Production. All
         Baseline Gas delivered to the Affiliate shall be delivered Wet at the
         Delivery Point.

         If the Affiliate does not wish to accept the Baseline Gas and the
         return of any Natural Gas provided by the Affiliate for gas lift, the
         Affiliate shall pay for whatever facilities or other expenses are
         necessary to dispose of all such Baseline Gas and Natural Gas in
         accordance with Venezuelan Law and Decisions. Any expenses that may be
         incurred by the Contractors and reimbursed by the Affiliate in this
         regard shall be the object of a separate agreement between the
         Contractors and the Affiliate and shall not be included in the
         calculation of the Service Fee. The Affiliate shall continue to accept
         the Baseline Gas until such facilities are available.

(ii)     The Contractors shall have the right to use all Associated Gas other
         than Baseline Gas ("Incremental Gas") in connection with performing
         the Operating Services hereunder. If requested by the Affiliate, the
         Contractors shall be obligated to deliver to the Affiliate at the
         relevant Delivery Point any Incremental Gas that they do not use in
         connection with the Operating Services. All Incremental Gas delivered
         to the Affiliate shall be delivered Wet at the Delivery Point.

(iii)    The Contractors shall pay the Affiliate for any Production of Natural
         Gas (including Baseline Gas and Incremental Gas) that is either used
         by the Contractors for any purpose other than reinjection or gas lift
         or disposed of in a manner requiring the payment of royalty under 
         Venezuelan law, at the official price as of the time of use for 
         Natural Gas for industrial uses, of the quality and in the location 
         concerned, as determined in accordance with applicable Venezuelan
         regulations as published most recently in the Gaceta Oficial. The
         cost of such Natural Gas shall be a Chargeable Expenditure that may be 
         included in the calculation of the Service Fee.

(iv)     The Affiliate may require that any volumes of Wet Baseline Gas or Wet
         Incremental Gas that the Contractors are planning to use for
         reinjection or gas lift in connection with the Operating Services
         pursuant to Clauses 16.2(i) or 16.2(ii) instead be delivered to the
         Affiliate at the relevant Delivery Point in exchange for the same
         volume of Dry Natural Gas delivered by the Affiliate to the
         Contractors either at the Receipt Point or at another mutually agreed
         location inside or outside the Area. There shall be no charge to the
         Contractors for the mere delivery of such Dry Natural Gas; the
         Affiliate may separately charge a reasonable fee for any compression
         of such Dry Natural Gas to a pressure higher than that at which the
         Wet Natural Gas is delivered to the Affiliate. Any royalty,
         exploitation tax or luxury and wholesale taxes due purely as a result
         or such exchange of Wet Natural Gas for Dry Natural Gas shall be paid
         by the Affiliate.

                                       47
<PAGE>   51
                                                                   BOQUERON AREA


         (v)     Unless otherwise agreed by the Affiliate, the Affiliate shall
                 not be obligated to accept any Associated Gas that does not
                 satisfy the quality standards specified in Annex H. The
                 Contractors shall have no obligation to treat Associated Gas
                 in order to meet such standards. The Contractors shall dispose
                 of any Associated Gas not used in providing the Operating
                 Services or delivered to the Affiliate, in accordance with
                 Venezuelan laws and regulations.

                                      XVII

                           PAYMENT AND REIMBURSEMENT

17.1     In (i) reimbursement of advances made by the Contractors for the
         acquisition of goods and services on behalf of the Affiliate and (ii)
         compensation for the provision of the Operating Services hereunder,
         the Affiliate shall pay to the Contractors a cash fee in U.S. dollars
         (the "Service Fee"), determined in the manner set forth in Article V of
         the Accounting Procedures. The Service Fee will be calculated and paid
         Quarterly on the basis of statements and invoices presented by the
         Contractors pursuant to Clause XVIII.

17.2.    (a) In addition to the two components of the Service Fee described in
         Clause 17.1, the Affiliate will pay to the Contractors the luxury and
         wholesale taxes (or any other similar Venezuelan value added or sales
         taxes) that the Contractors are required by Venezuelan law to collect
         in relation to the portion of the Service Fee representing
         compensation for the Operating Services (as determined in accordance
         with Article VI of the Accounting Procedures). Such luxury and
         wholesale taxes will be calculated and paid in Bolivars.

         (b) The payment of luxury and wholesale taxes described in the
         preceding paragraph will be in addition to the reimbursement pursuant
         to Article 1.6.2 of the Accounting Procedures of luxury and wholesale
         taxes that are paid by the Contractors on goods and services acquired
         by the Contractors from third parties for the account of the
         Affiliate.

17.3     As more fully set forth in Article 5.4 of the Accounting Procedures
         and except as otherwise agreed by the Affiliate in its discretion, the
         Service Fee shall be calculated and paid separately by the Affiliate
         with respect to each Field, and only costs incurred within the Field
         Boundary of any such Field or that are otherwise allocable to such
         Field will be taken into account in determining the Service Fee in
         respect of such Field. Except as otherwise agreed by the Affiliate,
         any allocation of costs must be made in accordance with the mechanisms
         established pursuant to the Accounting Procedures, as well as with
         the following rules:

         (i)   No costs incurred by the Contractors in Exploration Activities
               performed outside the Field Boundaries of any Fields existing
               as such at the time of such activities may be included in the
               calculation of the Contractors' costs for such Fields.

         (ii)  Costs incurred by the Contractors in Exploration Activities
               will be included in the Service Fee calculations in accordance
               with Article 5.4.5 of the Accounting



                                       48
<PAGE>   52
                                                                   BOQUERON AREA

               Procedures only with respect to a Field as to which a
               Development Plan is approved following the incurrence of such
               costs, except as otherwise approved by the Affiliate in its
               discretion. Upon the approval of such a Development Plan, all
               Well Expenditures incurred within the Field Boundary of the
               relevant Field, and all other Exploration Expenditures incurred
               since the date of approval of the most recent prior Development
               Plan, will be included in the Service Fee calculation for such
               Field, as provided in the Accounting Procedures.

         (iii) Costs that are associated with more than one Field, or with a
               Field and activities outside the Field Boundaries of the Fields,
               must be allocated in the manner set forth in the Accounting
               Procedures.

17.4     For purposes of calculating the Service Fee, the volume of all Liquid
         Hydrocarbons will be measured at the relevant Delivery Point(s)
         corrected to a water content of 0.1% in the case of Liquid
         Hydrocarbons having a water content greater than 0.1%, and the volume
         of all Natural Gas corrected to a content of impurities of no more than
         0.3%.

         All Incremental Production will be valued on the basis of the Price
         Formula. For purposes of applying the Price Formula to Liquid
         Hydrocarbons, the API gravity of all Production delivered at all
         Delivery Points in a Quarter will be deemed to be the average API
         gravity of all such Production weighted to take into account the
         actual volumes of Liquid Hydrocarbons having different API gravities
         delivered in such Quarter.

         Except as otherwise agreed by the Affiliate and the Contractors, the
         valuation of all Hydrocarbons made available at a Delivery Point in
         any Quarter shall be based on the average price determined in
         accordance with the Price Formula for each calendar day in such
         Quarter, without weighting based on the volume of Hydrocarbons
         delivered on any such day. There will be no payment for Associated Gas
         delivered to the Affiliate.

17.5     All payments of Service Fees and related luxury and wholesale or
         similar Venezuelan taxes on the compensation component thereof shall
         be made to accounts either inside or outside Venezuela to be
         designated by the Operator. The Affiliate shall be deemed to have
         fulfilled its obligations to pay the Service Fees and such taxes by
         payment to the Operator, and the Affiliate shall not be responsible
         for any failure by the Operator properly to divide any such payment
         among the Contractors. The sole recourse of the Contractors for any
         such failure shall be against the Operator.

                                     XVIII

                            STATEMENTS AND INVOICES

18.1     The Service Fee will be payable on a quarterly basis, against
         presentation by the Contractors of statements and invoices for the
         relevant Quarter, based on the volume of Production delivered to the
         Affiliate at the Delivery Point(s) in such Quarter. Payment will be
         made by the Affiliate


                                       49
<PAGE>   53
                                                                   BOQUERON AREA

         no more than 45 days following the receipt of each invoice. In the
         event that the Affiliate disputes all or any portion of an invoice and
         notifies the Contractor of the dispute within such 45-day period, the
         Affiliate shall pay the undisputed portion within such 45-day period
         and shall pay the balance upon resolution of the dispute. Any amount
         paid by the Affiliate after such 45-day period (including amounts
         subject to a dispute) shall bear interest from the last day of such
         45-day period to the date of payment at a rate adjusted each day equal
         to LIBOR for such day, plus 5% per annum. If the Affiliate notifies
         the Contractor of the dispute after payment, the Contractor shall
         refund any overpayment upon the resolution of the dispute. Any amount
         required to be refunded by the Contractor shall bear interest at the
         same rate, from the date of overpayment by the Affiliate to the date
         of the refund.

18.2     The luxury and wholesale taxes (or other similar Venezuelan value
         added or sales taxes) payable pursuant to Clause 17.2(a) shall be
         reflected separately in the invoices provided by the Contractors to
         the Affiliate.

18.3     Following the end of each Calendar Year, the statements and invoices
         for such Calendar Year will be reviewed by a firm of independent
         auditors designated by the Contractors and approved by the Affiliate,
         and, unless disputed by the Contractors, any adjustments found by such
         auditors will be reflected in the statement or invoice immediately
         following the delivery of the report of the auditors. Additional
         audits may be required by the Affiliate in accordance with the
         Accounting Procedures.

18.4     Payment of any invoice by the Affiliate shall not constitute a
         waiver of the Affiliate's right to object to all or part of such
         invoice. Such an objection may be raised by the Affiliate until the
         period for additional audits set forth in the Accounting Procedures
         expires and the resolution of any items found during the course of
         such audit or otherwise protested by the Affiliate during such period.

18.5     Invoice formats are specified in the Uniform Reporting System. All
         books used for purposes of calculating the Service Fee payable to the
         Contractors will be maintained in Dollars.

                                      XIX

                        TERM AND TERMINATION; EXTENSIONS

19.1    The term of this Agreement shall begin on the Effective Date and
        terminate as to each Field at the end of the Operation Period for such
        Field and as to areas outside a Field Boundary at the end of the
        period provided in Clause 19.2, subject in each case to early
        termination or extension as provided herein.

19.2    This Agreement will terminate after 5 years as to any part of the Area
        that is outside the Field Boundaries of the Fields existing at the end
        of such period, subject to possible extension pursuant to Clauses
        13.2 or 16.1.




                                  50
<PAGE>   54
                                                                   BOQUERON AREA

19.3      The term of the Agreement or of the Operation Period for any Field may
          be extended with the approval of the Affiliate, upon request made by 
          the Contractors at least six months prior to the date on which the 
          Operation Period would otherwise expire. The Affiliate may grant or 
          deny such request in its discretion. In the event that any matter is 
          undergoing independent expert review in accordance with Clause 23.3 
          at the time the Agreement otherwise would have terminated with 
          respect to any Field (or proposed Field), this Agreement will be 
          extended with respect to such Field (or proposed Field) pending the 
          conclusion of the independent expert review.

19.4      At least 24 months prior to the termination of this Agreement with
          respect to any Field or area (or, in the case of early termination
          pursuant to Clause XX, as soon as practicable after the Contractors
          become aware of termination), the Contractors shall submit to the
          Affiliate a transition plan including at a minimum:

                 a)  a description of the assets that are used in connection 
                     with such Field or area and owned by the Affiliate 
                     pursuant to Clause 12.1;

                 b)  a description or any material assets that are used in 
                     connection with such Field or area and are not owned by
                     the Affiliate, including the identity of the owner of such
                     assets and the terms on which such assets are currently
                     used and might continue to be available after termination;

                 c)  a description of any material contracts, leases or other 
                     arrangements with third parties for the provision of goods
                     or services in connection with such Field and an
                     indication whether such contracts, leases or other
                     arrangements might be assigned or transferred to the
                     Affiliate upon termination;

                 d)  a description of the technology and other information
                     subject to Clause XXIV, and of the proposed treatment of
                     such technology and other information upon termination;

                 e)  the report required by Clause 21.1 regarding the status 
                     of wells and related assets in the Field; and

                 f)  a plan for the transfer of operations back to the 
                     Affiliate upon termination.

         Such transition plan shall be amended from time to time to reflect any
         material changes or developments in the information or plans provided
         therein. Upon the termination of this Agreement with respect to any
         area or Field, all assets, contracts, leases and rights that were used
         with respect to any area or Field and are owned by the Affiliate
         shall be delivered to the Affiliate, free and clear from any liens or
         encumbrances.

19.5     Upon the termination of this Agreement, all rights and obligations of
         the Parties hereunder shall terminate, except for the following rights
         and obligations, which shall survive such termination:

         (a)  Claims of a Party against another Party for damages arising 
              out of acts or omissions of the other Party relating to such
              other Party's obligations under this Agreement;


                                       51
<PAGE>   55
                                                                 BOQUERON AREA

         (b)  The provisions of Clause XXV, which shall remain in effect for
              five (5) years following such termination; and

         (c)  The provisions of Clauses XXI and XXII until all remaining
              obligations of the Contractors thereunder have been performed
              in full.

         Upon termination of this Agreement, no further payment, compensation
         or consideration of any kind will be due or payable by the Affiliate
         to the Contractors (except for any Service Fee in respect of
         Hydrocarbons delivered to the Affiliate prior to the date of
         termination or any expenses that are specifically made subject to
         reimbursement hereunder), regardless of whether the Service Fee paid
         during the term of this Agreement has been adequate to reimburse their
         costs and expenses or compensate their services in providing the
         Operating Services.


                                       XX

                         DEFAULT AND EARLY TERMINATION

         This Agreement may be terminated early by the Affiliate, and the
         Contractors may withdraw from and terminate this Agreement, on the
         terms and subject to the conditions set forth in this Clause XX.

20.1     In the event that the Contractors fail to submit a Development Plan
         for the Initial Field to the Affiliate for approval within the period
         specified in Clause 6.1, or that a Development Plan for the Initial
         Field is not approved within 12 months after the initial submission
         of a Development Plan pursuant to Clause 6.1, the Affiliate will be
         entitled to terminate this Agreement by notice in writing to the
         Contractors.

20.2     In the event that any Contractor breaches its obligations under this
         Agreement in any material respect, and such breach is not cured
         within ninety (90) days after the Affiliate provides notice to the
         Contractors of such breach, the Affiliate shall have the right to
         terminate this Agreement as to the breaching Contractor or all
         Contractors in its discretion; provided that, if such breach is
         reasonably capable of being cured and the Contractors begin to pursue
         a cure within such ninety (90) day period, no termination may be
         effected so long as the Contractors continue diligently to pursue such
         cure. Notwithstanding the foregoing, a breach by a Contractor of its
         obligations under Clause XXV or XXVII shall give rise to a termination
         right on the part of the Affiliate only with respect to the affected
         Contractor. Upon a termination with respect to a defaulting
         Contractor, such Contractor's Participations in each Field and
         Exploration Activity shall be automatically transferred to the
         non-defaulting Contractors, on a pro rata basis, in accordance with
         the respective Participations of the non-defaulting Contractors in
         each such Field or Exploration Activity.



                                       52
<PAGE>   56
                                                                   BOQUERON AREA

20.3     In the event that any of the following events occurs with respect to
         any Contractor or any Person that guarantees such Contractor's
         obligations pursuant to Clause 3.2:

         (a)     An order is made by a court or an effective resolution is
                 passed for the reorganization under any bankruptcy law,
                 dissolution, liquidation, or winding up or such Contractor or
                 guarantor, which order shall not have been vacated,
                 discharged, stayed or bonded pending appeal within sixty (60)
                 days from the entry thereof,

         (b)     Such Contractor or any such guarantor dissolves, liquidates
                 or terminates its existence;

         (c)     Such Contractor or any such guarantor becomes insolvent,
                 bankrupt or makes an assignment for the benefit of creditors;

         (d)     A receiver is appointed for a substantial part of such
                 Contractor's assets or those of any such guarantor; or

         (e)     Such Contractor or any such guarantor commences a voluntary
                 receivership, bankruptcy, insolvency, dissolution,
                 liquidation, reorganization or similar proceeding,

         such Contractor shall have one hundred and twenty (120) days from the
         occurrence of such event to (i) transfer all of its rights and
         interests under this Agreement to such Person as the Affiliate may
         approve in accordance with Clause 27.1, or (ii) provide to the
         Affiliate a guarantee or such Contractor's obligations hereunder in
         form and substance, and from a guarantor, acceptable to the Affiliate.
         In the event that such Contractor does not effect such a transfer or
         provide such a guarantee within such time period, the Affiliate may
         terminate such Contractor's rights and interests under        
         this Agreement. Upon such termination, the defaulting Contractor's
         Participation in each Field or Exploration Activity shall be
         automatically transferred to the non-defaulting Contractors, on a pro
         rata basis, in accordance with the respective Participations of the
         non-defaulting Contractors in each Field.

20.4     Any Contractor may at any time following the satisfaction of the
         Minimum Work Obligation give notice to the Affiliate and the other
         Contractors that it wishes to withdraw from this Agreement, either
         entirely or only as to a particular Field or Exploration Activity.
         Within thirty (30) days of receipt of such notice, any of the other
         Contractors may similarly give notice that it wishes to withdraw from
         this Agreement, either entirely or as to such Field or Exploration
         Activity. If all such other Contractors give such notice, this
         Agreement shall be terminated either in its entirety or as to the
         particular Field(s) or Exploration Activity concerned, effective at
         the expiration of such 30-day period, and the Contractors shall
         abandon all relevant operations pursuant to Clause XXI. If less than
         all of the other Contractors give such notice, the withdrawing
         Contractors shall withdraw from this Agreement, either entirely or
         only as to the particular Field or Exploration Activity concerned, on
         the earliest practicable date and shall assign their respective
         Participations to the non-withdrawing Contractors, on the basis of
         their respective Participations. With respect to this Clause 20.4:



                                       53
<PAGE>   57
                                                                   BOQUERON AREA

         (i)      A withdrawing Contractor shall not be allowed to withdraw
                  from this Agreement if its interest hereunder or any
                  Participation is subject to any liens, charges or
                  encumbrances, unless the remaining Parties are willing to
                  accept the assignment subject to such liens, charges or
                  encumbrances;

         (ii)     A withdrawing Contractor shall remain liable and obligated
                  for its pro-rata share of all obligations incurred prior to
                  the date of withdrawal, even if the applicable operations are
                  to be implemented after the date of withdrawal, and for any
                  acts, occurrences or circumstances taking place or existing
                  prior to its withdrawal;

         (iii)    The withdrawal of the Operator or its Associated Entity may
                  only become effective upon the appointment of a replacement
                  Operator meeting the requirements of Clause X; and

         (iv)     The withdrawing Contractor shall remain liable for its
                  pro-rata share of the cost of abandonment in accordance with
                  Clause XXI and of any Post-Takeover Date Environmental Claim
                  and Cleanup Liability in accordance with Clause XXII.

                                     XXI

                          ABANDONMENT; INACTIVE WELLS

21.1     During the term of this Agreement, whenever any Contractor Well ceases
         to be capable of commercial production or to be useful for exploration
         or appraisal in the Area and there is no reasonable likelihood that
         such Contractor Well will again be capable of commercial production or
         useful for exploration or appraisal, the Contractors shall cause the
         Operator to plug such Contractor Well and remove from the relevant
         property as promptly as practicable any related facilities, equipment
         and other assets that the Contractors have used in providing the
         Operating Services, unless the Affiliate otherwise agrees. If the
         Operator proposes to plug any Contractor Well and remove any related
         facilities, equipment and other assets, the Operator shall prepare and
         deliver to the Affiliate, no later than 30 days prior to the proposed
         commencement of the relevant operations, a report as to the
         abandonment of such Contractor Well, including the costs of such
         abandonment. In the event that the Affiliate disputes whether such
         Contractor Well is capable of commercial production or useful for
         further exploration or appraisal, the Operator shall not plug such
         Contractor Well or remove such facilities, equipment and other assets,
         pending the resolution of the dispute. The Affiliate shall have the
         right to require a review of any such report by an independent expert
         appointed pursuant to Clause 23.3, and the determination by the expert
         as to whether the standards for abandonment of such Contractor Well are
         satisfied shall be final and binding.

         Similarly, if the Affiliate believes that a Contractor Well has ceased
         to be capable of commercial production or to be useful for exploration
         or appraisal in the Area, it may give notice to the Operator to this
         effect, and the Operator shall respond within 30 days of such notice
         either agreeing to plug and abandon such Contractor Well or stating
         the reasons that lead it to believe that there is a reasonable
         likelihood that such Contractor Well will again be capable of

                                       54

<PAGE>   58
                                                                   BOQUERON AREA

         commercial production or useful for exploration or appraisal. If the
         Affiliate does not accept such reasons, it shall have the right to
         require a review by an independent expert appointed pursuant to Clause
         23.3, and the determination by the expert as to whether the standards
         for abandonment of such Contractor Well are satisfied shall be final
         and binding. If the independent expert upholds the Affiliate's
         position, the Contractors shall promptly plug and abandon the
         Contractor Well(s) concerned.

         At least twenty-four (24) months prior to the end of the Operation
         Period with respect to each Field (or, in the case of an early
         termination of this Agreement pursuant to Clause XX, as soon as
         practicable after the Contractors become aware of such termination),
         the Contractors shall cause the Operator to prepare and deliver to the
         Affiliate a report listing the Contractor Wells in the Field(s)
         concerned that the Contractors are not planning to plug and abandon,
         the Contractor Wells that the Contractors are planning to plug and
         abandon, and the assets that the Contractors propose to remove, as well
         as a plan for the orderly transfer of operations to the Affiliate.

21.2     Plugging of wells and removal of equipment, facilities and other
         assets shall be undertaken by the Contractors in accordance with
         applicable Venezuelan laws and regulations and, to the extent
         consistent therewith, in accordance with International Oil Industry
         Standards.

21.3     In the event that the Operator delivers to the Affiliate a report
         indicating that it plans to plug and abandon any well (including an
         exploratory or appraisal well outside an existing Field Boundary), the
         Affiliate may, within 30 days after receipt of such report (48 hours
         if a rig is standing by, unless the Affiliate agrees within such 48
         hours to assume the stand-by costs of such rig until either it gives
         notice to the Contractors or such 30 days expire), notify the Operator
         that the Affiliate will assume responsibility for such well. In such
         event:

         (i)    the Operator shall not plug and abandon such well, and the
                Affiliate shall assume responsibility for such well;

         (ii)   neither the Operator nor any of the Contractors shall have any
                liability for any costs, expenses or damages arising out of or
                based upon the improper use or plugging and abandoning of such
                well, and the Affiliate shall indemnify the Operator and the
                Contractors from, and hold each of them harmless against, any
                costs, expenses (including without limitation reasonable legal
                costs, expenses and attorneys' fees), damages and liabilities
                incident to claims, demands or causes of action of every kind
                and character brought by or on behalf of any Person, for damage
                to or loss of property or the environment, or for injury to,
                illness or death of any Person, in each case to the extent such
                costs, expenses, damages and liabilities arise from or are
                based upon the improper use or plugging and abandoning of such
                well by the Affiliate; and

         (iii)  the Affiliate may plug and abandon such well or retain such
                well for possible future use for production or otherwise,
                except that the Affiliate may not during the Operation Period
                (or during the term of this Agreement with respect to the


                                       55


<PAGE>   59
                                                                  BOQUERON AREA


                 relevant portion of the Area, in the case of a well drilled
                 outside the Field Boundary of a Field) use such well to drill
                 to a target zone within the Area;

         provided that, in the case of an exploratory or appraisal well as to
         which the inclusion of the related Well Expenditures in the
         calculation or the Service Fee for a potential new Field is uncertain,
         the Affiliate will have the option to assume responsibility for such
         well as provided above only if, within 30 days following receipt of
         the report indicating the Operator's intention to plug and abandon
         such well, it agrees with the Operator on appropriate compensation for
         such well in the event that such Well Expenditures are in fact never
         included in the calculation or the Service Fee; provided that, if a
         rig is standing by, the Affiliate will have only 48 hours to reach
         such agreement, unless it undertakes within such 48 hours to assume
         the stand-by costs of such rig until either it reaches such agreement
         with the Contractors or such 30 days expire).

21.4     The Contractors shall have the following rights and obligations with
         respect to any inactive well in the Area that was not abandoned prior
         to the Takeover Date:

         (a) At any time until the later of (1) the Takeover Date and (2) 6
         months following the Effective Date, the Contractors shall have the
         right to enter, reactivate and use any such inactive well free of
         charge, subject to compliance with the following procedures:

         (i)     before first entering the well, the Contractors must receive
                 approval from the Affiliate of a plan for an integrity test to
                 determine the mechanical condition and environmental and
                 safety considerations relating to such well and any related
                 facilities;

         (ii)    upon approval by the Affiliate of such integrity test, the
                 Contractors may conduct the integrity test and, if one is
                 conducted, shall promptly report the results to the Affiliate,
                 stating (1) whether they choose to exercise the right to
                 reactivate such well for production or otherwise at that time,
                 (2) whether they have discovered any conditions presenting a
                 material risk to health and safety or to the condition of the
                 environment, and (3) an estimate of the costs of correcting
                 any such conditions if the Contractors were to undertake
                 remedial actions;

         (iii)   if, upon the completion of the integrity test, the Contractors
                 choose not to exercise the right to use such well, the
                 Contractors shall have no further rights or obligation with
                 respect to such well except as provided in Clause 21.4(b)
                 below; and

         (iv)    if, upon the completion of the integrity test, the Contractors
                 choose to exercise the right to use such well, such well shall
                 thereafter be a Contractor Well, the Contractors shall
                 thereafter assume all responsibility for such well, and the
                 Affiliate shall have no liability for any costs, expenses or
                 damages arising out of or based upon the improper drilling or
                 use of such well (whether prior to or after the date such well
                 is taken over by the Contractors).



                                     56
<PAGE>   60
                                                                 BOQUERON AREA

     Any inactive well as to which the Contractors do not exercise the option
     provided by this Clause 21.4(a) within the time period provided above may
     thereafter be used by the Contractors only with the approval of the
     Affiliate, and subject to such terms as the Affiliate may decide, in its
     discretion.

     (b)(1) The Contractors shall in any event inspect all inactive wells in
     accordance with (i) the procedures and schedule set forth in the relevant
     Development Plan in the case of inactive wells inside the Field covered by
     such Development Plan and (ii) procedures and a schedule requested by the
     Affiliate in the case of inactive wells outside any Field (which schedule
     shall provide for inspection no more frequently than every 6 months). The
     Contractors shall report to the Affiliate any conditions presenting a
     material risk to health and safety or to the condition of the environment,
     indicating the likely cause of such conditions and an estimate of the costs
     of correcting any such conditions if the Contractors were to undertake
     remedial actions. The reasonable costs of inspecting such inactive wells
     shall be separately reimbursed by the Affiliate outside the Service Fee.

     (2) If such conditions result in whole or in part from the Operator's
     actions in the Area (e.g., the repressurization of a reservoir), the
     Contractors shall cause the Operator to promptly undertake appropriate
     measures including, if necessary, plugging and abandoning the well(s)
     concerned. The cost of such measures shall be Chargeable Expenditures (to
     the extent they otherwise qualify as such) for the Field that caused such
     condition.

     (3) If such conditions do not result in whole or in part from the
     Operator's actions in the Area, the Affiliate shall promptly notify the
     Contractors as to whether the Affiliate wishes to take measures to correct
     such conditions, or whether the Contractors should do so. If the Affiliate
     states that it wishes to take such measures, it shall promptly do so at its
     own cost and expense. If the Affiliate states that the Contractors should
     take such measures, the Contractors shall do so, and the Affiliate shall
     promptly reimburse the Contractors outside the Service Fee for all
     reasonable costs and expenses incurred by the Contractors in the course of
     taking such measures.

     (4) If there is a disagreement as to either the cause of any such
     conditions or the need to take corrective measures, the Affiliate or the
     Operator may refer the matter to an independent expert pursuant to Clause
     23.3, whose decision as to the cause of such conditions or the need to take
     such measures, as the case may be, shall be final and binding.

     (c) Except as specifically provided in this Clause 21.4, the Contractors
     shall have no liability or obligation with respect to any such inactive
     wells.



                                      57


<PAGE>   61

                                                                   BOQUERON AREA

                                    XXII

                             ENVIRONMENTAL MATTERS

22.1     The Contractors shall establish, or cause the Operator to establish,
         an environmental protection program in connection with all operations
         undertaken in connection with the Operating Services with a view to
         ensuring that all such operations are conducted in accordance with
         Environmental Law. Each Development Plan and plan for an Exploration
         Activity shall contain such an environmental program for the
         applicable activities, including:

         (i)     emergency and contingency plans to attend to any crude oil
                 spills or other Releases;

         (ii)    a plan for protecting the environment, specifying the steps to
                 be taken for handling Releases and Hazardous Substances;

         (iii)   a plan for training all personnel who will be involved in
                 implementing such environmental program; and

         (iv)    a program for preventing injuries and/or industrial diseases.

22.2     (a) The Contractors and Operator shall have no liability for any
         Pre-Takeover Date Environmental Claim and Cleanup Liability, and the
         Affiliate shall indemnify and hold harmless the Contractors and the
         Operator against any Pre-Takeover Date Environmental Claim and Cleanup
         Liability. In the event that the Contractors or Operator are
         threatened with, or believe they may be liable for, any Pre-Takeover
         Date Environmental Claim and Cleanup Liability, they shall promptly
         notify the Affiliate and follow the Affiliate's instructions with
         respect to such Pre-Takeover Date Environmental Claim and Cleanup
         Liability. The Affiliate will promptly reimburse the Contractors and
         Operator for any Pre-Takeover Date Environmental Claim and Cleanup
         Liability that they may suffer or incur.

         (b) Neither the Affiliate nor any of its Associated Entities shall
         have any liability for any Post-Takeover Date Environmental Claim and
         Cleanup Liability, and the Contractors and Operator shall indemnify
         and hold harmless the Affiliate and its Associated Entities against
         any Post-Takeover Date Environmental Claim and Cleanup Liability. In
         the event that the Affiliate or its Associated Entities are threatened
         with, or believe they may be liable for, any Post-Takeover Date
         Environmental Claim and Cleanup Liability, they shall promptly notify
         the Operator and follow the Operator's instructions with respect to
         such Post-Takeover Date Environmental Claim and Cleanup Liability. The
         Contractors will promptly reimburse the Affiliate or its Associated
         Entities for any Post-Takeover Date Environmental Claim and Cleanup
         Liability that they may suffer or incur.

         (c) The Affiliate makes no representation or warranty, express or
         implied, with respect to environmental conditions in the Area or the
         compliance of conditions in the Area or operations as currently
         conducted with Environmental Law and, except as specifically provided
         in this Clause XXII, shall have no liability to the Contractors, the
         Operator or any of their respective

                                       58
<PAGE>   62
                                                                 BOQUERON AREA

         subcontractors, officers, directors, employees or agents with respect
         to or arising out of any such environmental conditions or
         non-compliance.

22.3     Following the Effective Date, the Contractors shall prepare or cause
         to be prepared an environmental audit in conformity with Environmental
         Law, in order to assess the environmental conditions existing in the
         Initial Field and the rest of the Area. Such audit shall not
         constitute conclusive evidence of the environmental problems or
         conditions existing as of the Takeover Date and shall not preclude the
         Contractors from demonstrating that a subsequent Environmental Claim
         and Cleanup Liability constitutes a Pre-Takeover Date Environmental
         Claim and Cleanup Liability.

         Prior to commencing such audit, the Contractors shall present for the
         Affiliate's approval a plan for such audit indicating:

         i)      the scope and content of such audit; and

         ii)     any Person or Persons, other than the Operator, that will
                 conduct the audit on behalf of the Contractors and the method
                 of selection of such Persons.

         Such audit shall be completed, and the results reported to the
         Affiliate, no later than six months following the Effective Date.

22.4     At the end of the Operation Period with respect to each Field (and
         upon termination of the Agreement with respect to other areas), the
         Contractors shall prepare or cause to be prepared an environmental
         audit on a basis substantially consistent with the audit prepared
         pursuant to Clause 22.3, except to the extent that Environmental Law
         or relevant industry practices change. Such audit shall be prepared
         during the last twelve months of the Operation Period (or term of the
         Agreement) and shall be delivered on or prior to the last day of the
         Operation Period (or term of the Agreement), unless the Operation
         Period (or Agreement) is terminated early pursuant to Clause XX, in
         which case the audit shall be prepared as soon as possible after the
         fact of such early termination becomes known by the Contractors, and
         shall be delivered to the Affiliate as soon as practicable after
         completion. Such audit shall not constitute conclusive evidence of the
         environmental problems or conditions existing as of such termination
         and shall not preclude the Affiliate from demonstrating that an
         Environmental Claim and Cleanup Liability constitutes a Post-Takeover
         Date Environmental Claim and Cleanup Liability.

22.5     In the event that the Contractors are at any time required to cease or
         curtail Baseline Production as a result of a condition, circumstance
         or production practice which exists as of the Takeover Date and which
         at such time violates Environmental Law, the Baseline Production for
         the Hydrocarbons concerned will immediately and permanently be
         reduced by the amount of such curtailment, unless (i) the Affiliate
         agrees within 30 days of such cessation or curtailment to pay for any
         measures or facilities that are needed so that the original Baseline
         Production will be in compliance with the relevant laws and
         regulations, and (ii) throughout the period of such curtailment, the
         Affiliate calculates and pays the portion or the Service Fee related
         to Baseline Production as if the Baseline Production were being
         produced in full. In this case, for purposes of Article 5.2.3 of the
         Accounting Procedures, the Baseline Production will be deemed to have
         been delivered in full. The expenses of implementing such measures or



                                       59
<PAGE>   63
                                                                 BOQUERON AREA

         constructing such facilities will be paid or reimbursed directly by
         the Affiliate and will not be included in the calculation of the
         Service Fee. The Contractors' actual knowledge of any such condition,
         circumstance or production practice prior to the Takeover Date shall
         not operate as a waiver of the Contractors' rights, or otherwise
         affect the Affiliate's obligations, under this Clause 22.5.

                                     XXIII

                   GOVERNING LAW; ARBITRATION; EXPERT OPINION

23.1     This Agreement shall be governed by and construed in accordance with
         the laws of the Republic of Venezuela.

23.2     (a)     Any dispute arising out of or concerning this Agreement shall
                 be settled exclusively and finally by arbitration. The
                 arbitration shall be conducted and finally settled by three
                 (3) arbitrators in accordance with the Rules of Conciliation
                 and Arbitration of the International Chamber of Commerce (the
                 "ICC Rules"), or such other rules as may be agreed by all of
                 the Parties involved. If the Affiliate is a party to the
                 relevant dispute, the Affiliate shall select an arbitrator and
                 the other party or parties thereto shall collectively select
                 an arbitrator in accordance with the ICC Rules. If the
                 Affiliate is not a party to the relevant dispute, and there
                 are only two such parties, each such party shall select an
                 arbitrator in accordance with the ICC Rules. In either such
                 case, the arbitrators so nominated shall then agree within
                 thirty (30) days on a third arbitrator to serve as Chairman.
                 If the Affiliate is not a party to the relevant dispute, and
                 there are more than two such parties, then all three
                 arbitrators, including the Chairman, shall be selected by the
                 International Court of Arbitration of the International
                 Chamber of Commerce in accordance with the ICC Rules, as if
                 all parties had failed to nominate arbitrators. All
                 arbitration proceedings under this Agreement shall be
                 conducted in New York City (United States of America). Any
                 decision or award of the arbitral tribunal (or the arbitrator)
                 shall be final and binding upon the Parties. Judgment for
                 execution of any award rendered by the arbitral tribunal (or
                 the arbitrator) may be entered by any court of competent
                 jurisdiction without review of the merits of such award. To
                 the extent permitted by law, any rights to appeal from or to
                 cause a review of any such award by any court or tribunal are
                 hereby waived by the Parties.

         (b)     To the extent that the Affiliate has or hereafter may acquire
                 any immunity from jurisdiction of any court or from attachment
                 in aid of execution of any other legal process (other than
                 pre-judgment attachment) in any action or proceeding conducted
                 pursuant to this Clause 23.2 (including any proceeding for the
                 enforcement of an arbitral judgment) with respect to itself or
                 its assets, the Affiliate hereby irrevocably agrees not to
                 invoke such immunity as a defense, and irrevocably waives such
                 immunity.

23.3     (a)     Whenever a matter is required to be determined by an expert
                 pursuant to any provision of this Agreement, the expert shall
                 be a reputable individual possessing expert knowledge



                                       60
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                                                                   BOQUERON AREA


              and experience for the determination of the matter in question and
              shall be independent of the Parties. The expert shall be appointed
              by agreement between the parties to the dispute or, in a default
              of such agreement, within thirty (30) days after a Party has
              requested the appointment of an expert by the International Center
              of Expertise of the International Chamber of Commerce at Paris.
              Such expert shall determine the matter in question within sixty
              (60) days after his appointment on the basis of terms of reference
              agreed between the parties to the dispute or otherwise as the
              expert may himself determine as an expert and not as arbitrator,
              and such determination shall be final and binding on the Parties
              hereto, except as otherwise provided herein. All costs of such
              expert shall be borne 50% by the Affiliate and 50% by the
              Contractors.

         (b)  Any time period during which a matter is undergoing expert review
              (beginning with the giving of notice regarding such review) shall
              not count against the time period for approval by the Affiliate of
              the issue in respect of which such matter was submitted for expert
              review.

         (c)  In the event that the Affiliate rejects for the third time any
              proposed Development Plan, Annual Work Program and Budget,
              Exploration Activity or amendment to a Development Plan (as such
              proposed Development Plan, Annual Work Program and Budget,
              Exploration Activity or amendment may have been modified or
              amended by the Contractors following the determination of an
              expert pursuant to this Clause), the Contractors thereafter shall
              not be entitled to submit to expert determination any matter in
              respect of such Affiliate's third rejection, and the Affiliate's
              rejection shall be final and binding.

23.4     The approval or disapproval of any matter by the Affiliate shall not
         supersede any applicable Venezuelan law or regulation or exempt any
         Party from being subject to any such law or regulation, nor shall it
         otherwise serve to modify the Party's remaining obligations under this
         Agreement.

23.5     Without limiting the generality of Clause 23.1, the Parties hereby
         acknowledge the applicability of Article 1160 of the Venezuelan Civil
         Code to this Agreement, and that accordingly all obligations hereunder
         shall be performed in good faith, and in accordance with equity, custom
         and law. The Parties also acknowledge the applicability of any
         international treaties relating to the mutual protection of foreign
         investment to which both Venezuela and any country of which a
         Contractor, an Operator or a guarantor thereof is a national may now be
         or hereafter become parties.


                                       61
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                                                                   BOQUERON AREA

                                      XXIV


            TECHNOLOGY; OWNERSHIP OF INFORMATION AND DATA; ACCESS TO FACILITIES

24.1     To the fullest extent permitted by applicable law or agreements, the
         Contractors agree to make available on reasonable terms their most
         appropriate technical expertise and technology for use in the
         provision of the Operating Services, including such technology as can
         best improve the economic yield or performance of the Hydrocarbon
         reservoirs developed and operated by the Contractors and the Operator
         under this Agreement.

24.2     The Contractors shall also endeavor to ensure that such Venezuelan
         personnel as are employed or assigned to managerial or technical
         positions within the Contractors or the Operator receive training in
         the use of such advanced technology as the Contractors or the Operator
         employ in the provision of the Operating Services. Such training may
         also be made available to employees of the Affiliate or any of its
         Associated Entities, subject to such agreed terms and conditions as
         may best serve the mutual interests of the Parties.

24.3     Any technology specifically developed by the Contractors or the
         Operator in the course of their activities under this Agreement shall
         be owned by both the Contractors and the Affiliate, and may be used by
         any of them or their Associated Entities in their own operations
         without the consent of the other and without making any payment to the
         other. All geological, geophysical and other data, as well as all
         other information developed in the course of the activities
         contemplated by this Agreement (other than technology specifically
         developed by the Contractors) will be owned by the Affiliate, but may
         be used free of charge by the Contractors or the Operator in connection
         with the Operating Services during the term of this Agreement.

24.4     The Affiliate shall have prompt and full access to all data, records
         and information used or produced by or for the Contractors or the
         Operator in connection with the Operating Services, regardless of
         whether such data, records and information would otherwise be
         considered proprietary or confidential, and shall have the right to
         inspect or cause to be inspected any and all facilities used in the
         Operating Services during regular business hours in a manner that will
         not materially interfere with the provision of the Operating Services.
         The Affiliate shall not be entitled to use, or to permit its
         representatives or any other Person to use, any proprietary
         information of any Contractor, the Operator or any of their respective
         Associated Entities that is inspected pursuant to this Clause 24.4,
         without the prior written consent of such Contractor, the Operator or
         such Associated Entity.



                                       62
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                                                                   BOQUERON AREA

                                      XXV

                                CONFIDENTIALITY

25.1     All data, records and information referred to in Clause 24.3 and 24.4,
         and any other information exchanged between any Parties or between the
         Operator and any Party in connection with this Agreement,
         ("Confidential Information") shall be treated as confidential by the
         party receiving such information (the "Receiving Party"), and shall
         not be disclosed by it to any third party unless the party that
         provided such information, data or materials (the "Disclosing Party")
         has given its prior consent to such disclosure.

25.2     Each Receiving Party may disclose such Confidential Information to any
         of its officers, directors, employees, Associated Entities, agents,
         subcontractors and advisors who (i) has a need to know the same in
         connection with carrying out the Operating Services and (ii) has been
         advised of, and agrees to comply with, the restrictions upon such
         Confidential Information set forth in this Agreement as if it were a
         Receiving Party.

25.3     Notwithstanding the foregoing, the Receiving Party may disclose
         Confidential Information to a third party without the Disclosing
         Party's prior written consent to the extent such information:

         (i)     is already known to the Receiving Party as of the date of
                 disclosure other than as a result of a breach of this Clause
                 XXV;

         (ii)    is already in possession of the public or becomes available to
                 the public other than through the act or omission of the
                 Receiving Party;

         (iii)   is developed independently by the Receiving Party without the
                 use of any Confidential Information;

         (iv)    is acquired independently from a third party, which is under
                 no legal obligation known to the Receiving Party prohibiting
                 such disclosure; or

         (v)     is required to be disclosed pursuant to any applicable law,
                 decree, regulation, rule or order of any competent authority.

         In the event that any Receiving Party is required by applicable law,
         decree, regulation, rule or order of any competent authority to
         disclose any Confidential Information supplied to it by any Disclosing
         Party, the Receiving Party shall promptly notify in writing the
         Disclosing Party, so that the Disclosing Party may seek an appropriate
         protective order and/or waive the Receiving Party's compliance with
         the confidentiality requirement. In the event that such protective
         order or other remedy is not obtained, then the Receiving Party shall
         furnish only that portion of such Confidential Information that is
         legally required to be disclosed.

25.4     Notwithstanding the foregoing, any Contractor may disclose
         Confidential Information to any Person with whom such Contractor
         enters into bona fide negotiations for the Transfer of an



                                       63
<PAGE>   67
                                                                   BOQUERON AREA

         interest hereunder, or for the financing or insuring of any activities
         hereunder, or to their respective advisors, so long as (i) the
         Confidential Information is limited to such information as the
         potential transferee, financier, insurer or any such advisor, requires
         for purposes of evaluating the proposed transaction, and (ii) the
         potential transferee, financier, insurer or advisor, agrees in writing
         to abide by confidentiality restrictions identical to those set forth
         in this Clause XXV.

25.5     All press releases, advertisements and other announcements or
         publications by the Operator, any Contractor or any of their
         Associated Entities involving information relating to this Agreement
         or the Operating Services must be approved by the Affiliate prior to
         distribution or dissemination, except to the extent such announcements
         relate to emergency situations and are reasonably necessary for the
         protection of the environment or health or safety.


                                      XXVI

                                 FORCE MAJEURE

26.1     Failure of a Party to fulfill any obligation incurred under this
         Agreement shall be excused and shall not be considered a default
         hereunder during the time and to the extent that such noncompliance is
         caused by an Event of Force Majeure, except that if the Event of Force
         Majeure is an act of the Venezuelan State that is not of general
         applicability, such Event of Force Majeure shall not preclude an
         action for damages against the Affiliate for the non-performance of
         the relevant obligation.

26.2     For the purposes of this Agreement, an "Event of Force Majeure" shall
         mean any event or circumstance, other than lack of finances, beyond
         the reasonable control of and unforeseeable by the Party obligated to
         perform the relevant obligation, or which, if foreseeable, could not
         be avoided in whole or in part by the exercise of due diligence,
         including but not limited to strikes, boycotts, stoppages, lockouts
         and other labor or employment difficulties, fires, earthquakes,
         tremor, landslides, avalanches, floods, hurricanes, tornadoes, storms,
         other natural phenomena or calamities, explosions, epidemics, wars
         (declared or undeclared), hostilities, guerrilla activities, terrorist
         acts, riots, insurrections, civil disturbance, acts of sabotage,
         blockades, embargoes, or acts of state or any governmental body.

26.3     If any Party cannot comply with any obligation stipulated herein
         because of an Event of Force Majeure, such Party shall notify the
         other Parties in writing as promptly as possible giving the reason for
         non-compliance, particulars of the Event of Force Majeure and the
         obligation or condition affected. Except as provided in Clause 26.1,
         any obligation of a Party shall be temporarily suspended during the
         period in which such Party is unable to perform by reason of an Event
         of Force Majeure, but only to the extent of such inability to perform.
         The obligations of the Parties to perform as provided by this
         Agreement through facilities not affected by the Event of Force
         Majeure shall continue. The Party affected by the Event of Force
         Majeure shall promptly notify the other Parties as soon as such event
         has been removed and no longer



                                       64
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                                                                   BOQUERON AREA


         prevents it from complying with its obligation, and shall thereafter
         resume compliance with the Agreement.

26.4     The Party which has given notice of an Event of Force Majeure shall
         endeavor to mitigate the effects of such Event of Force Majeure on the
         performance of its obligations. Where an Event of Force Majeure
         continues for more than sixty (60) days, the Parties shall meet to
         review the situation and its implications for operations and to
         discuss the appropriate course of action in the circumstances.

26.5     If an Event of Force Majeure occurs that substantially impedes
         development or exploitation activities, the relevant Operation Period
         will be extended by an amount of time equal to the period during which
         such event is in effect. In each case, such extension will be only
         with respect to any affected Field. If the Operation Period is
         extended pursuant to this Clause 26.5, the Affiliate shall not be
         entitled to draw on any letter of credit or guarantee delivered by a
         Contractor pursuant to Clause 4.4 until the end of the period set
         forth in Clause 4.3, plus a time period equal to the duration of any
         extension, but only if such Contractor provides a replacement of or
         amendment to such letter of credit or guarantee, in form and substance
         satisfactory to the Affiliate, ensuring that the Affiliate's rights at
         the end of such period will be the same as the rights it would have
         enjoyed at the end of the original period had no such extension
         occurred.


                                     XXVII

                         ASSIGNMENT; CHANGE IN CONTROL

27.1     No Contractor may effect a Transfer without the prior consent of the
         Affiliate. Such consent may be granted or withheld at the Affiliate's
         discretion (i) before the Minimum Work Obligation is satisfied in
         full, and (ii) if the proposed Transfer would result in a Person
         holding a Participation of less than 9% in any Field. In addition, no
         Transfer can be made that would result in non-compliance with Clause
         10.3. At least 30 days prior to any proposed Transfer, the Contractor
         shall provide notice to the Affiliate of the Transfer, including the
         name of the proposed transferee and the Participations in each Field
         to be transferred. Notwithstanding the foregoing, (i) any Contractor
         whose obligations are guaranteed pursuant to Clause 3.2 may effect a
         Transfer to any Associated Entity of the guarantor, upon confirmation
         by the guarantor in form and substance satisfactory to the Affiliate
         that the applicable guarantee remains in effect as to the obligations
         of the transferee, and (ii) any other Contractor may effect a Transfer
         to any Associated Entity of such Contractor, upon execution by the
         Contractor of a guarantee substantially in the form of Annex D hereto
         with respect to the obligations of such Associated Entity.

27.2     For purposes of Clause 27.1, if any Contractor's obligations are
         guaranteed pursuant to Clause 3.2, any proposed transaction that, if
         consummated, would result in the guarantor ceasing to be an
         Associated Entity of such Contractor shall be considered a Transfer,
         subject to the Affiliate's right of consent pursuant to Clause 27.1



                                       65
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                                                                   BOQUERON AREA


27.3     The Affiliate may not effect a Transfer without the prior consent of
         the Contractors. Notwithstanding the foregoing, no consent shall be
         required for the Transfer by the Affiliate in whole or in part of its
         rights or obligations hereunder to PDVSA or any Associated Entity of
         PDVSA.

27.4     Upon the consummation of any Transfer by a Contractor, the transferee
         shall be considered for all purposes a Contractor, with the
         Participation in each Field specified in the notice delivered to the
         Affiliate pursuant to Clause 27.1. Upon the consummation of any
         Transfer by the Affiliate, the transferee shall be considered the
         "Affiliate" for all purposes hereunder.

27.5     Any purported Transfer by a Contractor or by the Affiliate that does
         not comply with this Clause XXVII shall be null and void and shall
         vest no rights in the purported transferee.

27.6     Nothing in this Clause XXVII shall prohibit the Operator from
         subcontracting all or any portion of the activities involved in the
         Operating Services in compliance with the terms of this Agreement. The
         Operator shall be fully responsible for the performance of its
         obligations hereunder, notwithstanding any such subcontracting
         arrangement (although the Operator may agree with any subcontractor on
         indemnity arrangements satisfactory to the Operator and such
         subcontractor).


                                     XXVIII

                                    NOTICES

28.1     All notices, demands, instructions, waivers, consents or other
         communications to be provided pursuant to this Agreement shall be in
         writing in Spanish, shall be effective upon receipt, and shall be sent
         by personal delivery, courier, facsimile or telex, to the following
         addresses:

         (i)     If to the Contractors, to:

                 UNION TEXAS VENEZUELA LIMITED

                 1330 Post Oak Blvd

                 Houston, Texas 77056

                 Attn.: Newton W. Wilson, III, President

                 Telephone: (713) 968-2808

                 Facsimile: (713) 968-2815



                                       66
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                                                                   BOQUERON AREA


                 PREUSSAG ENERGIE GmbH

                 Waldstrasse 39

                 D49809 Lingen

                 Germany

                 Attn: Heinz-Georg Feuerborn, General Counsel

                 Telephone: 49-591-612-202

                 Facsimile: 49-591-6127-000


         (ii)    If to the Affiliate, to:

                 LAGOVEN, S.A.

                 Edificio Lagoven

                 Av. Leonardo Da Vinci, Los Chaguaramos

                 Caracas 1010-A, Venezuela

                 Production Department, Piso 8

                 Attn: Roland Glaenztlin

                 Telephone: 58-2-606-4585 / 58-2-606-5502

                 Facsimile: 58-2-606-4426 / 58-2-606-3371

         The addresses and telex and facsimile numbers for notices given
         pursuant to this Agreement may be changed by means of a notice given
         to all Parties at least fifteen (15) Business Days prior to the
         effective date of such change.


                                       67
<PAGE>   71
                                                                   BOQUERON AREA


                                      XXIX

                                 MISCELLANEOUS


29.1     To be binding, any amendment of this Agreement must be effected by an
         instrument in writing signed by all of the Parties. No further
         formalities by the Parties shall be required to amend this Agreement.

29.2     Rights hereunder may not be waived, except pursuant to a writing
         signed by the Party against which enforcement of the waiver is sought.

29.3     Notwithstanding anything to the contrary contained in this Agreement,
         in no event shall any Party be liable to any other Party for any
         consequential damages or lost profits that such other Party may
         suffer.  The Parties acknowledge that this Clause is intended only to
         limit their liability to each other for consequential loss or damage,
         and shall not be construed so as to limit their liability to third
         parties or their right to seek indemnification for third party claims
         in accordance with any other Clause.

29.4     Nothing contained herein is intended to create, or shall be deemed or
         construed as creating, any legal entity between the Parties. No Party
         shall have the authority or right, or hold itself out as having the
         authority or right, to assume, create or undertake any obligation of
         any kind whatsoever, express or implied, on behalf of or in the name
         of any other Party, except as expressly provided herein. Except to the
         extent that the Contractors are to acquire goods and services from
         third parties for the account of the Affiliate on a non-recourse basis
         as provided herein, no provision in this Agreement shall constitute
         the Contractors or the Operator, or any of their employees,
         subcontractors, agents or representatives, an employee, contractor,
         agent or representative of the Affiliate. The Contractors and the 
         Operator shall be independent contractors and shall be responsible for
         and have control over the performance of the Operating Services        
         hereunder, subject to the standards set forth in this Agreement. Any
         provision herein giving the Affiliate the right to direct the
         Contractors or the Operator as to any details of the performance of
         the Operating Services shall not be construed to limit or release the
         obligations of the Contractors or the Operator hereunder.

29.5     The obligations of the Contractors and the Operator hereunder shall be
         several and not joint, except that the Operator shall be jointly and
         severally liable for the obligations of the Contractors as provided in
         Clause 10.1.

29.6     This Agreement my be executed in one or more counterparts, each of
         which shall be considered an original.

29.7     This Agreement is being executed in the Spanish language, and an
         English language version is being acknowledged as an official
         translation. The Spanish version shall constitute the only binding
         version, and the English translation is being acknowledged as a matter
         of reference only.



                                       68
<PAGE>   72
                                                                   BOQUERON AREA


                                   SIGNATURES

         In Caracas, Venezuela, on the 29 day of the month of July, 1997.

         ACKNOWLEDGED AS OFFICIAL TRANSLATION

         LAGOVEN S.A


         By:

         /s/ JULIUS TRINKUNAS       
         ---------------------------
         Name: Julius Trinkunas            [SEAL]

         Title: President




         UNION TEXAS VENEZUELA LIMITED


         By:     /s/ NEWTON W. WILSON, III  
                 ---------------------------
         Name:   Newton W. Wilson, III

         Title: President




         PREUSSAG ENERGIE GmbH


         By:     /s/ RUDOLPH BERENDS        
                 ---------------------------
         Name:   Rudolph Berends

         Title: Attorney in Fact



                                       69
<PAGE>   73
                                     ANNEX A
                               DESCRIPTION OF AREA
                                  BOQUERON AREA

  1.  LOCATION

      The Area is comprised of sixty square kilometers (60 km(2)) and is located
      four kilometers (4 km) northeast of the city of Maturin, in the Boqueron
      field.

  2.  MAP
     
      [See attached map.]

  3.  STRATIGRAPHIC REFERENCE COLUMN

      The following stratigraphic column shall be the official reference for
      Annexes A and B.

          AGE                        FORMATION              MEMBER
          ---                        ---------              ------   

          MIOCENE                    CARAPITA

          OLIGOCENE                  NARICUAL             NARICUAL SUPERIOR
                                                          NARICUAL MEDIO
                                                          NARICUAL INFERIOR
                                     AREO

          CRETACEOUS                 LOS JABILLOS

  4.  AREA BOUNDARY

      Horizontally the Area boundary is represented by a polygon of four (4)
      vertices, the geographic coordinates of which are indicated in the map
      included herein.

      Vertically the Area comprises the entire stratigraphic column, without
      limit of depth.




                                      A-1
<PAGE>   74





                                     ANNEX B
                          DESCRIPTION OF INITIAL FIELD
                                  BOQUERON AREA

1.    MAP

      [See attached map.]

2.    FIELD BOUNDARY Of THE INITIAL FIELD

      Aerially the Field Boundary of the Initial Field is comprised of a
      polygon of eight (8) vertices, the geographic coordinates of which are
      indicated in the map included herein.

      Vertically the Field Boundary of the Initial Field is comprised of the
      base of the Carapita Formation of the Miocene Age and the top of the Areo
      Formation of the Oligocene Age.




                                      B-1
<PAGE>   75





  ANNEX C

  [Translation]

  



                             ACCOUNTING PROCEDURES





<PAGE>   76





                              ACCOUNTING PROCEDURES

I.       GENERAL CONDITIONS

1.1      Purposes

         The purposes of these Accounting Procedures are to establish the
         accounting procedures that will allow the maintenance of all the
         necessary records to reflect in a consistent manner the costs of
         exploiting Hydrocarbons in the Area, to facilitate the payment of
         Service Fees and to permit the Parties to comply with their other
         obligations and responsibilities under the Agreement.

1.2      Definitions(1)

         Capitalized terms defined in the Agreement (as defined below), when
         used in these Accounting Procedures, have the respective meanings
         assigned to such terms in the Agreement. The following definitions are
         in addition to and supplement those set forth in the Agreement.

                  "Agreement" means the Operating Agreement of which these
                  Accounting Procedures form a part.

                  "Bolivar Exchange Rate" means, as of any date of determination
                  in any calendar month, the average of the daily closing
                  exchange rates for each day in such calendar month on which
                  the relevant rate is fixed, for the purchase of Bolivars with
                  Dollars, determined for each such day in accordance with
                  Venezuelan laws and regulations for use in a transaction of
                  the type being recorded or booked. If at any time there is 
                  more than one legal rate for purchase of Bolivars with Dollars
                  with respect to the relevant type of transaction, the rate to
                  be used shall be the rate that most nearly reflects the free
                  market rate for such conversion. In the event that there is a
                  dispute as to which rate satisfies such requirement, pending
                  the resolution of the dispute, the Bolivar Exchange Rate for
                  any such day shall be equal to the rate at which the Operator
                  actually purchased Bolivars with Dollars, in its most recent
                  bona fide arms' length transaction of at least $10,000, from
                  Persons other than the Operator, a Contractor or an Associated
                  Entity of the Operator or a Contractor.

                  "Calendar Year" means the period of time from and including
                  January 1 in any year through and including December 31 in the
                  same year.

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(1)  Definitions in this English translation are presented in alphabetical order
     in English for ease of reference. Accordingly, the order of these
     definitions does not match the order in the definitive Spanish version.



<PAGE>   77





                  "Capital Expenditures" means those Chargeable Expenditures or
                  proposed Chargeable Expenditures that are or would be
                  classified as capital expenses (including capitalized lease
                  expenses) in accordance with PDVSA Accounting Principles.

                  "Cash Method" means that method of accounting in which all
                  revenue and expenditure items are recorded as of the date on
                  which cash or other consideration is actually paid or received
                  by the relevant party.

                  "Chargeable Expenditures" means expenditures that are eligible
                  for inclusion in the calculation of the Service Fee in
                  accordance with Article IV of these Accounting Procedures.
                  Chargeable Expenditures will not include any Financing
                  Charges.

                  "CPI" means the Consumer Price Index for All Urban Consumers
                  (CPI-U), United States City Average (base period 1982-1984 =
                  100), as published by the United States Bureau of Labor
                  Statistics. In the event that such index is no longer
                  published or is no longer representative of the changes in
                  consumer prices in the United States, the Parties shall select
                  an alternative index that most accurately reflects changes in
                  consumer prices in the United States. In the absence of
                  agreement, either Party may require that the determination be
                  made by an independent expert appointed pursuant to Clause
                  23.3 of the Agreement.

                  "Expenditure Reductions" means any reduction in, or refund or
                  reimbursement of, any Chargeable Expenditures that are
                  received by the Operator or any Contractor after such
                  Chargeable Expenditures have been included in the calculation
                  of the Service Fee, including, without limitation, (i) any
                  refunds, discounts (other than discounts deducted from the
                  original purchase price), rebates; damages or other amounts 
                  received following the purchase or leasing of goods or
                  services, (ii) any amounts received as damages from, or in
                  settlement of, a legal proceeding (including an arbitration
                  proceeding), and (iii) any insurance proceeds in respect of
                  loss or damage.

                  "Exploration Expenditures" means all Chargeable Expenditures
                  made or proposed to be made in connection with an approved
                  Exploration Activity, Exploration Expenditures will not be
                  included in the calculation of the Service Fee for any Field,
                  except as provided in Clause 17.3 of the Agreement and Article
                  5.4 of these Accounting Procedures.

                  "Financing Charges" means all interest, fees and other
                  financing expenses for indebtedness (including all obligations
                  for borrowed money, all obligations evidenced by bonds, notes,
                  debentures or similar instruments, all letters of credit or
                  banker's acceptances, all delinquent tax liabilities, and all
                  obligations for the deferred purchase price of goods or
                  services, including any lease accounted for as a capitalized
                  lease, in all cases determined on the basis of international
                  accounting standards), If (i) the documentation for any such
                  indebtedness does not clearly


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                  state an interest and financing component or the Affiliate
                  does not believe that the interest and financing component
                  stated in such documentation reflects a bona fide, arms'
                  length and reasonable interest and financing component and
                  (ii) the Affiliate and the Contractors are unable to agree on
                  an appropriate interest and financing component, the Affiliate
                  may at any time prior to the end of the period that may be
                  covered by an additional audit under Article 3.2 of these
                  Accounting Procedures, request that the question of an
                  appropriate interest and financing component be decided by an
                  independent expert in accordance with Clause 23.3. of the
                  Agreement. The decision of the independent expert will be
                  final and binding.

                  "Net Hydrocarbon Value" means, with respect to any Field, for
                  any Quarter, the value of the Incremental Production from such
                  field that is delivered in such Quarter at the applicable
                  Delivery Point(s) (after taking into account any reduction
                  pursuant to Article 5.2.3 of these Accounting Procedures),
                  based on the Price Formula, net of (i) Royalties in respect of
                  such Incremental Production (and in respect of any Production
                  of Liquid Hydrocarbons that is not delivered at a Delivery
                  Point and is used, disposed of or lost in a manner that
                  subjects such Production to exploitation tax (royalty) under
                  Venezuelan laws and regulations), and (ii) the percentage
                  specified in Schedule A to these Accounting Procedures of the
                  gross value of such Incremental Production based on the Price
                  Formula, in respect of the administrative costs incurred by
                  the Affiliate.

                  "Operating Expenditures" means those Chargeable Expenditures
                  or proposed Chargeable Expenditures that are or would be
                  classified as current expenses in accordance with PDVSA
                  Accounting Principles.

                  "PDVSA Accounting Principles" means the body of generally
                  accepted accounting principles used by PDVSA in the
                  preparation of its audited financial statements in Venezuela,
                  applied on a consistent basis, as such principles may be
                  amended from time to time. Promptly following the Effective
                  Date, the Affiliate shall provide the Contractors with
                  information regarding the PDVSA Accounting Principles
                  currently in effect and will thereafter consult with the
                  Contractors as requested regarding the proper classification
                  of Chargeable Expenditures for purposes of the Development
                  Plan and the first Annual Work Program and Budget for the
                  Initial Field. Any amendments to the PDVSA Accounting
                  Principles will be notified to the Contractors in a timely
                  manner. If a subsequent amendment of PDVSA Accounting
                  Principles would affect the classification of Chargeable
                  Expenditures as Operating Expenditures or Capital Expenditures
                  as reflected in the Development Plan, such classification
                  shall be revised (without need for amendment pursuant to
                  Clause IX of the Agreement) so that the classification of
                  Chargeable Expenditures therein remains consistent with the
                  classification of Chargeable Expenditures in the current and
                  future Annual Work Programs and Budgets.




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                  "Quarter" means a period extending from January 1 to March 31,
                  April 1 to June 30, July 1 to September 30 or October 1 to
                  December 31 in any Calendar Year.

                  "Uniform Reporting System" shall have the meaning set forth in
                  Article 2.1.

                  "Well Expenditures" means all Chargeable Expenditures directly
                  associated with the drilling, deepening, completion,
                  recompletion, plugging back, reworking, sidetracking, testing,
                  suspension or abandonment of a well, including, without
                  limitation, site preparation, drilling charges, rental or
                  acquisition of drilling equipment, materials used in the
                  course of such activities and activities directly relating
                  thereto, logging costs, testing costs, plugging costs and
                  personnel costs in respect of the foregoing activities.

1.3    Currency

       1.3.1  Dollar Books

              All transactions relating to activities conducted in relation to
              the Agreement shall be recorded in Dollars in the books of account
              and other records maintained by the Operator.

       1.3.2  Transactions in Dollars

              The Service Fee paid by the Affiliate, Chargeable Expenditures
              made by the Operator in Dollars and Expenditure Reductions
              received by the Operator in Dollars shall be recorded at their
              actual amounts as of the date of the relevant transaction (as
              determined pursuant to Article 1.4.3).

       1.3.3  Transactions in Currencies Other Than Dollars 

              Chargeable Expenditures made by the Operator in Bolivars and
              Expenditure Reductions received by the Operator in Bolivars shall
              be translated into Dollars on the basis of the Bolivar Exchange
              Rate as of the date of the relevant transaction. The Dollar amount
              resulting from such determination shall be recorded in the books
              of the Operator as if the transaction had been originally effected
              in Dollars.

              Chargeable Expenditures incurred by the Operator in a currency
              other than Bolivars or Dollars shall be translated into Dollars
              and recorded in the books of the Operator as if such Chargeable
              Expenditures had been originally effected in Dollars, on the basis
              of either:

              (i)     if Dollars were actually used by the Operator to purchase
                      such other currency specifically for the relevant
                      transaction from a Person other than the Operator, a
                      Contractor or an Associated Entity of the Operator or a
                      Contractor, the rate at which such purchase was effected
                      (or, if there was



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                      more than one such purchase, the average purchase rate,
                      weighted by the respective Dollar amounts of such
                      purchases); or

              (ii)    in all other cases, the rate at which the Operator
                      actually purchased such other currency with Dollars in its
                      most recent bona fide arms' length transaction of at least
                      $10,000 from Persons other than the Operator, a Contractor
                      or an Associated Entity of the Operator or a Contractor,
                      or if no such purchase has been made within 30 days prior
                      to the relevant transaction, the rate published in the
                      "Cross Currency Rate" table (or any successor table) in
                      the London edition of the Financial Times most recently
                      prior to the date of the transaction.

  1.4    Accounting Records

         1.4.1   The Operator shall open and maintain such separately
                 identifiable accounting records as may be necessary to record
                 in a full and proper manner the Service Fee paid by the
                 Affiliate, all Chargeable Expenditures incurred by the
                 Operator, all Expenditure Reductions, and all other amounts
                 necessary to permit compliance with these Accounting Procedures
                 and the Agreement. For purposes of these Accounting Procedures,
                 Expenditure Reductions received by a Party other than the
                 Operator shall be considered to be received by the Operator on
                 the date of receipt by such Party (and shall be remitted to the
                 Affiliate by such Party immediately upon receipt).

         1.4.2   All accounts WILL show clearly any luxury and wholesale taxes
                 (or similar Venezuelan sales or value added taxes) paid or
                 collected by the Operator for the account of the Affiliate that
                 are reimbursable to the Contractors pursuant to Article 1.6 of
                 these Accounting Procedures.

         1.4.3   All Service Fees, Chargeable Expenditures and Expenditure
                 Reductions shall be recorded in the Operator's accounting books
                 and records in accordance with the Cash Method. The Operator's
                 books and records shall be maintained in accordance with the
                 Cash Method for all purposes hereunder, except that any
                 Chargeable Expenditures that are prepaid so that they are
                 incurred in cash in a Quarter prior to that in which they are
                 due shall be deemed to have been incurred in the Quarter in
                 which they are due.

         1.4.4   The Operator shall maintain its books and records separately
                 for each Field and for all Exploration Expenditures, and
                 otherwise in order to permit the Operator to make all
                 calculations arid to prepare all reports required to be made or
                 prepared hereunder.

1.5    Inflation

         1.5.1   Except for purposes of the determination of "Deflated Pre-Tax
                 Cash Flow" and "Inflated Pre-Tax Cash Flow" in Article 5.2, and
                 except as provided in Article 1.5.2, amounts recorded in the
                 books and records of the Operator shall not be


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                 adjusted for inflation and shall remain in the Operator's books
                 and records on the basis of historical amounts.

         1.5.2   For purposes of determining whether the cost thresholds set
                 forth in Sections 7.3, 7.6(ii) and 9.1 of the Agreement are
                 exceeded, Chargeable Expenditures incurred, and projections
                 made as to Chargeable Expenditures, in a Quarter other than the
                 Quarter in which the relevant determination is being made shall
                 be adjusted for inflation on the basis of the respective values
                 of the CPI most recently published as of the first day of the
                 respective Quarters for which the determination is being made,
                 so as to make such determinations on the basis of constant
                 Dollars.

         1.5.3   In order to improve the comparability of financial information,
                 the Contractors shall, to the extent reasonably practical,
                 present Development Plans and Annual Work Programs and Budgets
                 in constant Dollars.

1.6      Advances to Affiliate; Venezuelan Luxury and Wholesale Taxes

         1.6.1   All assets and services that are purchased or leased by the
                 Contractors from third parties in connection with the Operating
                 Services (including any assets or services purchased or leased
                 from an Associated Entity of any Contractor acting as a
                 supplier) shall be deemed to have been acquired for the account
                 of the Affiliate and funded through non-recourse advances from
                 the Contractors to the Affiliate, as described more fully in
                 Article VI.

         1.6.2   Accordingly, all Venezuelan luxury and wholesale taxes (or
                 similar Venezuelan value added or sales taxes) that are due in
                 connection with the purchase, sale, leasing or other
                 acquisition of any such assets or services relating to the
                 provision of Operating Services shall be deemed to have been
                 incurred and paid for the account of the Affiliate, and shall
                 be reimbursed to the Contractors by the Affiliate in Bolivars
                 monthly, against presentation of written requests for
                 reimbursement in the form specified in the Uniform Reporting
                 System. Such reimbursement shall be made within 30 days
                 following the receipt of the request for reimbursement.

         1.6.3   No Venezuelan taxes that are subject to reimbursement pursuant
                 to Article 1.6.2 may be included in the Chargeable Expenditures
                 submitted to the Affiliate for inclusion in the calculation of
                 the Service Fee, and all Chargeable Expenditures must be
                 charged net of such taxes.

  II.    REPORTS

  2.1    Uniform Reporting System

         The "Uniform Reporting System" shall consist of tile various reports,
         plans, notices, budgets, AFEs, statements, invoices and other documents
         that will be used for the collection and presentation of technical,
         financial and other information whose communication or exchange is
         contemplated by the Agreement, these Accounting Procedures or
         applicable Venezuelan Laws and Decisions. The Affiliate shall establish
         the 

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         the Uniform Reporting System no later than 30 days following the
         Effective Date, after consultation with the Contractors (and the
         Operator, if it has executed the Agreement), taking into account that
         an important objective of the Uniform Reporting System is uniformity of
         reporting under the Agreement and the other operating services
         agreements entered into in connection with the bidding round pursuant
         to which this Agreement has been executed. The frequency and detail of
         reporting under the Uniform Reporting System shall be consistent with
         the Affiliate's normal business practices (which may change over time),
         the requirements of applicable Venezuelan Laws and Decisions and the
         provisions of the Agreement. The Uniform Reporting System may be
         modified from time to time by the Affiliate, following review and
         comment by the Contractors and the Operator, The Contractors and
         Operator will be required to comply in all material respects with the
         Uniform Reporting System.

2.2      Monthly Reports

         Subject to the requirements of the Uniform Reporting System, the
         Operator shall provide monthly reports to the Affiliate no later than
         the 10th day of the immediately following month (or, in the case of
         the last month of any Quarter, the earlier of the 5th day of the
         immediately following month or the day on which the relevant invoice is
         delivered to the Affiliate), The monthly report shall include all
         relevant information separately for each Field and for Exploration
         Expenditures, as well as aggregate information for all Fields.

         2.2.1   Chargeable Expenditures. Each monthly report shall specify the
                 aggregate amount of Chargeable Expenditures incurred by the
                 Operator in the relevant month, separately indicating the
                 budget items and AFEs (or groupings of budget items and AFEs)
                 to which the Expenditures relate and the amount of luxury and
                 wholesale taxes (or other similar Venezuelan sales or value
                 added taxes) paid by the Operator and reimbursable to the
                 Contractors pursuant Article 1.6 of these Accounting
                 Procedures.

         2.2.2   Production. Each monthly report shall specify the volume of
                 Production delivered to the Affiliate at each Delivery Point
                 in the relevant month pursuant to Clause 15.4 of the
                 Agreement.
                 
         2.2.3   Expenditure Reduction. Each monthly report shall specify the
                 aggregate amount of any Expenditure Reductions in the relevant
                 month, separately indicating the types of such Expenditure
                 Reductions.

         2.2.4   Service Fee. The monthly report for any month other than the
                 last month of any Quarter shall include an estimate of the
                 Service Fee that the Operator expects will be payable in
                 respect of the Quarter during which such month occurs, based on
                 actual activities conducted through the end of such month and
                 the Operator's expectations as to activities to be conducted
                 during the remainder of such Quarter, The monthly report for
                 the last month for any Quarter shall include a copy of the
                 invoice showing the Service Fee payable for such Quarter (or,
                 if such invoice has



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                 not yet been finalized, shall include a statement as to the
                 amount of the Service Fee expected to be payable for such
                 Quarter).

         2.2.5   Other Information. The monthly report shall include such other
                 information as is specified in these Accounting Procedures or
                 the Uniform Reporting System or as may be reasonably requested
                 by the Affiliate.

2.3      Annual Reports

         Subject to the requirements of the Uniform Reporting System, the
         Operator shall provide an annual report to the Affiliate, setting forth
         the information required to be contained in the relevant monthly
         reports on an aggregate basis for the relevant year. An annual report
         relating to activities conducted by the Operator in any Calendar Year
         shall be provided to the Affiliate no later than February 15 of the
         immediately following Calendar Year. If the audit of such annual report
         is not yet complete by such date, a preliminary, unaudited annual
         report may be provided, provided that the audited annual report must
         be provided no later than March 31.

III.     AUDITS

3.1      Annual Audit

         In accordance with Clause 18.3 of the Agreement, an annual audit will
         be performed by a firm of independent auditors designated by the
         Contractors and approved by the Affiliate. A report of such external
         auditors shall accompany each audited annual report provided by the
         Operator pursuant to Article 2.3 of these Accounting Procedures, and
         shall confirm the calculation of the amounts specified therein, or
         shall note any exceptions of such external auditors with respect to the
         amounts specified therein.


3.2      Additional Audit

         The Affiliate may require that one additional audit be performed in any
         year. Such additional audit shall be performed by a firm of independent
         auditors of recognized international standing with expertise in
         Venezuelan accounting principles appointed by the Affiliate or by duly
         qualified auditors that are employees of the Affiliate or an Associated
         Entity of the Affiliate. Such additional audit may cover any or all
         annual reports, monthly reports or invoices prepared in the then
         current Calendar Year and the two preceding Calendar Years. Any annual
         report, monthly report or invoice not eligible for coverage in such an
         additional audit in accordance with the preceding sentence shall be
         deemed final and binding, except to the extent of any exceptions
         previously noted in an annual audit or additional audit or any items
         previously protested by a Party, which in either case have not yet been
         resolved. The Affiliate shall give at least 30 days' notice to the
         Operator of its intention to conduct such an additional audit.




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3.3      Resolution Of Exceptions

         In the event that an audit performed pursuant to Article 3.1 or 3.2
         indicates any exceptions, or in the event that the Affiliate protests
         any item contained in an annual report, monthly report or invoice that
         is the subject of an audit conducted pursuant to Article 3.1 or 3.2,
         the Affiliate and the Operator shall attempt to reconcile the exception
         or the protested item. In the event that they are not able to achieve
         such a reconciliation within 180 days of the date of the audit report
         or the date of the protest, as the case may be, the matter shall be
         resolved by arbitration in accordance with Clause XXIII of the
         Agreement. The resolution of any such item shall include a mechanism
         for adjusting the resolved item (either by adjustment to a subsequent
         invoice or by payment from one party to the other party). Pending the
         resolution of any such item, the original position shall be maintained
         without adjustment.

3.4      Audit Expenses

         Expenses of any audit or confirmation provided pursuant to Article 3.1
         shall be paid by the Operator and shall be Chargeable Expenditures.
         Expenses of any audit conducted pursuant to Article 3.2 shall be paid
         by the Affiliate, except that they shall be payable by the Operator
         (and shall not be included as Chargeable Expenditures) if, as part of
         the resolution of any exception or protest based on such audit, the
         aggregate amount of the Service Fee payable by the Affiliate is reduced
         by at least $250,000 below the aggregate amount set forth in the annual
         reports, monthly reports and/or invoices being examined.

3.5      Conduct Of Audits

         Audits shall be conducted in a manner so as to minimize disruptions to
         the Operator's activities. The Operator shall cooperate with the
         auditors, including providing access to all relevant facilities during
         regular business hours and appropriate assistance to the auditors.

3.6      Cost Plus Contracts

         The Operator shall endeavor to obtain audit rights for all contracts of
         a "cost-plus" nature entered into in connection with the Operating
         Services.

IV.      CHARGEABLE EXPENDITURES

         Subject to the limitations set forth in these Accounting Procedures and
         the Agreement, the Operator may include in the calculation of the
         Service Fee the items of expenditure listed in this Article IV insofar
         as they are (i) paid on or after the Effective Date, and (ii) are
         reasonable and necessary for the conduct of the operations conducted in
         accordance with the Agreement (it being understood that items of
         expenditure falling under more than one heading set forth in this
         Article IV may be charged only once).

         Subject to the limitations provided in this Article IV, in Article 5.4
         and elsewhere in these Accounting Procedures and the Agreement,
         expenses incurred in the preparation of the



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         Development Plan for a Field prior to the approval of such Development
         Plan may subsequently be included as Chargeable Expenditures in the
         calculation of the Service Fee for such Field.

         Expenses relating to more than one Field or related to a Field and to
         other activities of the Operator or Contractors shall be allocated as
         provided in Article 5.4.

4.1      Personnel Costs

         Actual costs of salary and related benefits of all personnel who work
         on the Operating Services directly for the Operator (including, without
         limitation, as a result of reasonable secondment from a Contractor or
         an Associated Entity of the Operator or a Contractor to the extent that
         such secondment is identified in an approved Annual Work Program and
         Budget) shall be chargeable, in accordance with the customary personnel
         policies of the Operator or the Contractor, as the case may be (or of
         any group of Associated Entities that includes the Operator or the
         Contractor). In the event that the Operator or Contractor (or their
         respective groups of Associated Entities) has no such policies, the
         Operator shall propose personnel policies to the Affiliate for
         approval, and personnel costs shall only be chargeable to the extent
         incurred in accordance with such approved policies. Costs of personnel
         that work an both the Operating Services and other operations shall be
         allocated on the basis of the proportion of time spent in the relevant
         activities.

4.2      Administrative Overhead Costs

         4.2.1   The Operator shall be entitled to charge in each Calendar Year
                 an amount in respect of administrative overhead equal to 1% of
                 the Chargeable Expenditures charged pursuant to Article 1.4.3
                 for such Calendar Year (other than Chargeable Expenditures
                 calculated pursuant to this Article 4.2). The Operator shall be
                 entitled to charge the Affiliate for administrative overhead
                 Quarterly, on the basis of the other Chargeable Expenditures
                 incurred in the relevant Quarter.

         4.2.2   Administrative overhead charges shall be allocated among
                 Fields, and as Exploration Expenditures, in proportion to the
                 respective amounts of other Chargeable Expenditures allocated
                 to such Fields or as Exploration Expenditures.

4.3      Expenses Incurred by Personnel

         All direct expenses reasonably and necessarily incurred by personnel
         who work under the direct control of the Operator on the Operating
         Services shall be chargeable, including reasonable travel,
         accommodations and communications expenses for personnel working
         directly for the Operator away from their permanent residence in
         connection with such Operating Services, and reasonable relocation
         expenses for such personnel and their immediate families. All expenses
         charged pursuant to this Article 4.3 shall be in accordance with the
         customary personnel policies established by the Operator (or any group
         of Associated Entities that includes the Operator), except as otherwise
         provided by the Agreement. Relocation expenses at the termination of a
         period of work on the Operating Services will be charged on the basis
         of the lower of the cost of a return to




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         point of origin or actual, and shall be apportioned between the
         departure location and the receiving location on an equitable basis, in
         accordance with the customary personnel policies described above.

4.4      Transport

         4.4.1   The cost of transport to move personnel and material reasonably
                 and necessarily incurred by the Operator in connection with the
                 Operating Services shall be chargeable, whether such
                 transportation is provided directly by the Operator or by a
                 third party under a contract awarded by the Operator.

         4.4.2   The cost of Transportation and Handling of Hydrocarbons
                 produced from any Field to the relevant Delivery Point or
                 Delivery Points shall be chargeable, and shall include:

                 (a)      tariffs paid for the use of Transportation and
                          Handling facilities (other than facilities constructed
                          or acquired by the Operator for the account of the
                          Affiliate as part of the Operating Services); and
               
                 (b)      costs associated with the construction, acquisition
                          and operation of any Transportation and Handling
                          facilities by the Operator for the account of the
                          Affiliate as part of the Operating Services.

4.5      Material

         4.5.1   Costs of material, equipment or other personal property
                 ("Material") purchased or leased by the Operator for use in
                 connection with the Operating Services shall be chargeable,
                 including Material purchased or transferred from warehouse
                 stock. Material purchased or leased for use in the Operating
                 Services shall be charged at cost, which shall mean net invoice
                 price (after deducting all trade and cash discounts actually
                 received that are deductible from the relevant price when paid)
                 together with any transport costs, forwarding and documentation
                 fees, insurance on transportation, packing costs, duties,
                 license fees, taxes (other than Venezuelan luxury and wholesale
                 taxes) and like items chargeable in respect of such goods.
                 Material transferred from warehouse stock of the Operator or
                 its Associated Entities shall be chargeable in accordance with
                 policies to be adopted by the Operator and approved by the
                 Affiliate, and shall not be chargeable in the absence of the
                 adoption and approval of such policies.

         4.5.2   So far as is consistent with efficient and economical operation
                 and provision for emergencies, only such Material shall be
                 purchased or leased as may be required for immediate use, and
                 the accumulation of surplus stocks shall be avoided.

4.6      Services

         The cost of services and facilities provided to the Operator for the
         Operating Services by subcontractors, consultants, Associated Entities
         or other Persons with whom contracts are




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         concluded by the Operator in accordance with the contracting policies
         established in accordance with Clause XI of the Agreement shall be
         chargeable.

4.7      Litigation and Legal Services

         All costs and expenses of litigation, arbitration and other legal
         services necessary or expedient in connection with the Operating
         Services (including reasonable attorneys' fees) shall be chargeable,
         including amounts paid in settlement of claims and amounts paid
         pursuant to Clause 11.10 of the Agreement, other than costs and
         expenses incurred (i) in relation to claims made by one or more Parties
         against one or more other Parties in relation to the Agreement or the
         transactions contemplated therein, or (ii) as a result of or arising
         from the gross negligence or willful misconduct of the Operator or any
         Contractor.

4.8      Auditing Services

         All fees and expenses payable or reimbursable to the independent
         auditors that perform the annual audit specified in Article 3.1 of
         these Accounting Procedures shall be chargeable.

4.9      Taxes

         All taxes, duties and other governmental levies of every kind and
         nature assessed or levied upon or in connection with the Operating
         Services that have been paid by the Operator or the Contractors shall
         be chargeable, other than (i) corporate income taxes, (ii) luxury and
         wholesale or similar Venezuelan taxes that are eligible to be
         reimbursed to the Contractors pursuant to Article 1.6 of these
         Accounting Procedures, and (iii) as provided in the next sentence.
         Municipal and State taxes payable by the Contractors shall only be
         Chargeable Expenditures to the extent that (i) they are calculated
         based on the portion of the Service Fee corresponding to the
         Contractors' compensation as determined in accordance with Article VI
         of these Accounting Procedures, (ii) they are levied at a rate greater
         than 4%, and (iii) the Contractors take such measures as the Affiliate
         may reasonably request to challenge the imposition of such taxes over
         4% as excessive (such taxes in excess of 4% being chargeable as paid so
         long as the Contractors continue to take such measures). The cost of
         measures taken at the request of the Affiliate to challenge such taxes
         will constitute litigation expenses under Article 4.7. Subject to the
         above conditions, if such Contractors' compensation is subject to
         Municipal and State taxes in more than one taxing jurisdiction and the
         aggregate of the Municipal and State taxes in all such jurisdictions
         exceeds 4% of total compensation, the excess shall be Chargeable
         Expenditures; provided that, for purposes of calculating such
         Chargeable Expenditures, such total compensation will be deemed to have
         been subject to such tax only once (and not subject to double taxation
         by two or more such jurisdictions).

4.10     Damages and Losses

         All costs and expenses necessary for the repair or replacement of
         property acquired by the Operator for the account of the Affiliate with
         Chargeable Expenditures, or for loss of life or injury, due to fire,
         flood, storm, theft, accident or any other cause, or for remedying any
         environmental condition in the Area in accordance with Clause XXII
         of the Agreement, or





                                       12


<PAGE>   88





         in respect of any facilities used in connection with the Operating
         Services, shall be chargeable, other than (i) costs or expenses
         incurred as a result of or arising from the gross negligence or willful
         misconduct of the Operator or any Contractor, and (ii) any such costs
         and expenses, to the extent of any amounts recovered under any
         insurance policy and applied to the repair or replacement of the
         relevant property or the compensation of the relevant Persons in
         accordance with Clause 11.10 of the Agreement.

4.11     Insurance

         Insurance premiums shall be chargeable to the extent provided in Clause
         11.10(a) of the Agreement.

4.12     Real Property

         Payments made for the purchase or acquisition of real property used in
         connection with the Operating Services, including the acquisition or
         extension of rights-of-way and similar property rights, shall be
         chargeable. Costs relating to real property used in both the Operating
         Services and other operations shall be allocated in an equitable manner
         in accordance with formulas or guidelines to be proposed by the
         Contractor and approved by the Affiliate, and shall not be chargeable
         in the absence of the adoption and approval of such policies.

4.13     Royalties and License Fees

         Royalties and license fees payable in respect of any technological
         processes or other intellectual property licensed for use in connection
         with the Operating Services shall be chargeable.

4.14     Miscellaneous Expenditures

         Any cost or expense incurred by the Operator that is not covered in
         Articles 4.1 to 4.13 of these Accounting Procedures and that is
         reasonable and necessary for the provision of the Operating Services
         shall be chargeable, so long as such cost or expense (or the relevant
         type of cost or expenses) is approved by the Affiliate. Expenses
         specifically included in an Annual Work Plan and Budget will be deemed
         to have been approved.

V.       SERVICE FEE CALCULATION AND FINANCIAL MATTERS

5.1      General

         The Service Fee will be payable on a quarterly basis, beginning with
         the Quarter in which the Operation Period for the Field concerned
         begins, against presentation of invoices, in accordance with Clauses
         XVII and XVIII of the Agreement. A single Service Fee will be 
         calculated for each Quarter for each Field in accordance with the
         provisions set forth in this Article V. The Contractors may submit the
         invoice for any Quarter to the Affiliate at any time following the
         conclusion of such Quarter, and the Affiliate shall pay the applicable
         Service Fee to the Contractors at the time set forth in Clause 18.1 of
         the


                                       13


<PAGE>   89





         Agreement. The Affiliate shall pay the Service Fee for all of the
         Contractors to a single Dollar account inside or outside Venezuela
         designated in writing by the Operator. The Operator shall be
         responsible for allocating each such payment among the Contractors. The
         Affiliate shall be fully discharged from its obligations in respect of
         the Service Fee by making payment to the account specified pursuant to
         this Article 5.1, and shall have no responsibility in the event that
         the Operator fails to allocate any such payment properly.

5.2      Service Fee Formula
           
5.2.1    The Service Fee for any Field for any Quarter (q) shall be calculated 
         in accordance with the following formula:

                                                  *


* Confidential portions on pages 14, 15, 16 and 17 have been omitted pursuant to
  a request for confidential treatment and filed separately with the Commission.


                                       14
<PAGE>   90


*

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



         
                                       15
<PAGE>   91
*

  5.2.2  For purposes of determining the Service Fee for any Quarter in which
         MIRR(q) becomes positive after having been negative in the immediately
         preceding Quarter, the Quarter in respect of which the calculation is
         being made shall be divided into two periods. One such period shall be
         of sufficient duration so that MIRR(q) as of the end of such period
         shall be zero, and the other such period shall reflect the remainder 
         of the Operating Services conducted during such Quarter. A separate 
         Service Fee shall be calculated for each such period (as if each were a
         Quarter), and the Service Fee for such Quarter shall be equal to the
         sum of the Service Fees calculated for such periods.

  5.2.3  For purposes of calculating the Service Fee, in the event that the
         Production from the Initial Field for any Quarter is less than the
         Baseline Production (or, during the first 12 months after the Takeover
         Date, more than 10% below the Baseline Production for such Quarter),
         the shortfall (which, in such first 12 months, shall be the excess of
         the shortfall over 10%) shall be applied in the following Quarter (and,
         if necessary, in subsequent Quarters) to reduce the Incremental
         Production and to increase the Baseline Production until the entire
         shortfall has been so applied. This Article 5.2.3 shall not apply to
         the extent that a shortfall in Baseline Production results from a
         reduction or curtailment of Production pursuant to Clauses 11.1(b),
         XIV, 15.4(b), 22.5 or XXVI of the Agreement or as a result of
         extraordinary maintenance to surface facilities.

  5.3    Baseline Production

         The portion of the Service Fee consisting of a payment for Baseline
         Production for any Quarter ("A(q)" in the formula set forth in Article
         5.2) shall be calculated for each Quarter in accordance with the
         following formula:
                                *

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       16
<PAGE>   92

*

         The payment for Baseline Production shall only be made in respect of
         the Initial Field. No other Field has Baseline Production.

  5.4    Ringfencing and Allocation

  5.4.1  Except as otherwise approved by the Affiliate, the Service Fee shall be
         calculated separately for each Field. Production and Chargeable
         Expenditures allocable to one Field in accordance with this Article 5.4
         shall not be included in the calculation of the Service Fee for any
         other Field.

  5.4.2  All Chargeable Expenditures and Production shall be allocated among
         Fields in accordance with the procedures set forth in this Article 5.4.

  5.4.3  Chargeable Expenditures that relate exclusively to Operating Services 
         within, or in respect of, the interior of the Field Boundary of a
         single Field shall be allocated in full to such Field.

  5.4.4  Chargeable Expenditures associated with the Transportation and 
         Handling of Production from the wellhead or other point of extraction
         to the relevant Delivery Point shall be allocated in full to the Field
         from which such Production is realized. To the extent that such
         Production is blended with other Hydrocarbons prior to its delivery at
         the Delivery Point, such Chargeable Expenditures shall be allocated to
         the relevant Fields in the manner set forth in Article 5.4.6.

  5.4.5  (a)  Exploration Expenditures shall not be included in the calculation 
              of the Service Fee for any Field, except as follows:

         (i)  Well Expenditures for wells with a target zone within the Field 
              Boundary of a subsequently established Field (or, in the case of
              wells with multiple target zones, a portion of such Well
              Expenditures, calculated in the manner set forth in paragraph (b)
              below) shall be included in the calculation of the Service Fee for
              such Field, as of the first Quarter following the approval of the
              applicable Development Plan by the Affiliate; provided that such
              wells are completed as producing wells or injection wells for such
              Field in accordance with International Oil Industry


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       17
<PAGE>   93


              Standards and are included as such in the applicable Development
              Plan for such Field; and

         (ii) Exploration Expenditures other than Well Expenditures shall be
              included in the calculation of the Service Fee for the Field, if
              any, for which the immediately following Development Plan is
              approved by the Affiliate, except that no Exploration Expenditures
              shall under any circumstances be included in the calculation of
              the Service Fee for the Initial Field (unless the Exploration
              Activities concerned lead to the discovery of a Hydrocarbon
              formation outside the Initial Field that is found to be Connected
              with the Initial Field and subsequently included within amended
              Field Boundaries for the Initial Field pursuant to Clause 8.8 of
              the Agreement).

         (b)  In the event that any well is drilled with multiple target zones 
         in the Area, except as otherwise approved by the Affiliate, the related
         Well Expenditures shall be allocated among such target zones such that
         (x) Well Expenditures incurred in connection with reaching the first
         target zone in the Area and any completion or recompletion in respect
         of such target zone shall be allocated in full to such target zone, and
         (y) Well Expenditures incurred in connection with drilling from any
         target zone to any other target zone, and any completion or
         recompletion in respect of the latter target zone, shall be allocated
         in full to the latter target zone.

  5.4.6  In the event that:

         (a)  The Operator incurs or proposes to incur Chargeable Expenditures 
              relating to more than one Field; or

         (b)  Production from a Field is combined with other Hydrocarbons 
              (whether or not constituting Production hereunder) prior to its 
              delivery at an applicable Delivery Point,

         such Chargeable Expenditures or Production (and the Chargeable
         Expenditures associated with Transportation and Handling of such
         Production) shall be allocated by the Operator on the basis of formulas
         or guidelines approved by the Affiliate and included in the relevant
         Development Plans or Annual Work Programs and Budgets, based on such
         equitable mechanisms as are customary in similar circumstances in the
         international oil industry or as may be approved by the Affiliate. If
         the Operator believes that any decision by the Affiliate to withhold
         its approval of any such mechanism is not consistent with the foregoing
         standard, the Operator may at any time until the expiration of 30 days
         following the date of rejection require that the final determination be
         made by an independent expert appointed in accordance with Clause 23.3
         of the Agreement. The decision of the expert shall be final and
         binding.

  5.5    Royalties

         The Royalties that are to be deducted from the value of the Incremental
         Production from a Field in calculating Net Hydrocarbon Value for any
         Quarter shall be equal to the product




                                       18
<PAGE>   94

         of (i) the applicable Royalty Rate, (ii) the volume of the Incremental
         Production in any Quarter for which the Royalty is to be deducted
         pursuant to these Accounting Procedures, and (iii) the wellhead value
         of such Production, all determined in accordance with Venezuelan law.
         The Royalty Rate shall be the rate at which the exploitation tax is
         actually assessed by the Ministry of Energy and Mines in accordance
         with applicable Venezuelan laws and regulations. As of the date of the
         Effective Date, the Royalty Rate is *.

  5.6    Abandonment Costs

         Chargeable Expenditures incurred in the last five years of the
         Operation Period for any Field (without regard to any extension of the
         Operation Period, unless such extension is granted before the relevant
         Chargeable Expenditures are incurred) and associated with plugging and
         abandoning wells or removing facilities in accordance with Clause XXI
         or with the final environmental audit and any Post-Takeover Date
         Environmental Claim and Cleanup Liability in accordance with Clause
         XXII of the Agreement ("Abandonment Costs") shall be included in the
         calculation of the Service Fee in the manner set forth in this Article
         5.6 in the circumstances described in this Article 5.6.

         (i)   Whenever CF(q) (as determined in accordance with Article 5.2) for
               the Quarter in which Abandonment Costs are incurred is negative,
               an amount (the "Shortfall Amount") equal to the lesser of (i) the
               total amount of such Abandonment Costs, and (ii) the absolute
               value of CF(q) for such Quarter shall be calculated.

         (ii)  The Operator may charge and include the Shortfall Amount in the
               succeeding Quarter as if the Shortfall Amount were a Chargeable
               Expenditure incurred in such succeeding Quarter. If after
               applying the Shortfall Amount in such manner, CF(q) for such
               succeeding Quarter is negative, then the excess portion of the
               Shortfall Amount shall be calculated and applied to the
               calculation of the Service Fee for the next succeeding Quarter,
               as if the excess Shortfall Amount so applied were a Chargeable
               Expenditure incurred in such Quarter. This process shall continue
               until a Quarter is reached in respect of which CF(q), determined
               after applying any remaining Shortfall Amount, is positive.

         (iii) Periodically, the Operator shall make an assessment as to whether
               the aggregate of CF(q) for all remaining Quarters in the
               Operation Period will be greater than the total of all remaining
               Shortfall Amounts, based on forecast Production and Chargeable
               Expenditures in the Development Plan and the Price Formula. If
               so, then no further calculations shall be made. If not, then the
               Operator shall calculate an amount equal to the excess of the
               Shortfall Amount over the sum of the projected CF(q) amounts for
               all such remaining Quarters (such excess, the "Carryback
               Amount"). As of the end of each Quarter remaining in the
               Operation Period, the Operator shall periodically reassess any
               Carryback Amount that has not yet been recovered as provided
               below and shall, if necessary, adjust the remaining Carryback
               Amount accordingly.


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       19
<PAGE>   95
         (iv)  The Operator shall redetermine the Service Fee (without
               recalculation of MIRR(q) for the immediately preceding Quarter as
               if the Carryback Amount had been a Chargeable Expenditure
               incurred in such prior Quarter.

          (v)  If after applying the Carryback Amount in such manner, CF(q) for
               such preceding Quarter is negative, then the excess portion of
               the Carryback Amount shall be calculated and applied to the
               recalculation of the Service Fee for the next preceding Quarter,
               as if the excess Carryback Amount so applied were a Chargeable
               Expenditure incurred in such Quarter. This process shall continue
               until a Quarter is reached in respect of which CF(q), determined
               after applying any remaining Carryback Amount, is positive.

         (vi)  The Operator shall determine, for each Quarter in respect of
               which the Service Fee is recalculated as provided above, the
               difference between (x) the Service Fee as so recalculated, and
               (y) the Service Fee originally charged for such Quarter.

         (vii) The sum of the differences determined pursuant to clause (vi)
               shall be chargeable to the Affiliate as an addition to the
               Service Fee for the Quarter in which the Abandonment Costs are
               incurred or for a subsequent Quarter as determined by the
               Operator, and shall be reflected separately on the relevant
               invoice.

  VI.    AMORTIZATION OF ADVANCES AND ALLOCATION OF THE SERVICE FEE

  6.1    General

         All goods and services that are purchased or leased by the Contractors
         from third parties in connection with the Operating Services (including
         any goods or services purchased or leased from an Associated Entity of
         any Contractor acting as a supplier) shall be deemed to have been
         acquired for the account of the Affiliate and funded through
         non-recourse advances from the Contractors to the Affiliate. Such
         advances shall be repayable to the Contractors only to the extent that
         a portion of the Service Fee is applied to amortize such advances in
         accordance with this Article VI. Any such advances that are not so
         amortized at the time of termination of the Agreement with respect to
         any Field, and any such advances in respect of Exploration Expenditures
         that are not allocated to a Field prior to the termination of this
         Agreement, shall be deemed canceled at the time of such termination.

         No interest shall be separately calculated or paid with respect to any
         such advances. Financing charges associated with such advances shall be
         deemed to be included and entirely paid as part of the portion of the
         Service Fee representing the Contractors' compensation for the
         Operating Services.

         For purposes of calculating the amount of any Municipal and State taxes
         that may be Chargeable Expenditures pursuant to Article 4.9, the
         Contractors shall include as revenues subject to such taxes only that
         part of the Service Fee that corresponds to the Contractors'
         compensation for the Operating Services and not the portion
         corresponding to the reimbursement of such advances made by the
         Contractors to the Affiliate.


                                       20
<PAGE>   96


  6.2    Principles of Amortization

         Advances made by the Contractors to the Affiliate as provided in
         Article 6.1 shall be amortized on the basis of PDVSA Accounting
         Principles in effect from time to time, which currently provide as
         follows:

         (i)   advances in respect of items that would be treated as expenses 
               in the Quarter in which they are incurred for Venezuelan tax
               purposes shall be amortized in the year in which they are
               incurred;

         (ii)  advances in respect of fixed assets and capitalized expenses
               upstream of the first tank farm shall be amortized on a unit of
               production basis according to the proved developed reserves for
               the Field concerned (or the Fields concerned, if such advances
               are in respect of Chargeable Expenditures allocated to more than
               one Field), on the basis of the reserves estimates and production
               profiles specified in the relevant Development Plan; and 

         (iii) advances in respect of fixed assets and capitalized expenses at
               the first tank farm or downstream of the first tank farm shall be
               amortized using the straight-line method, based on the useful
               life of such assets;

         in each case, to the extent the Service Fee is sufficient for such
         purpose or otherwise in subsequent Quarters until the Service Fee for
         such subsequent Quarters is sufficient for such purpose (amortizing in
         each Quarter the advances with the shortest remaining amortization
         period first).

  6.3    Allocation of the Service Fee

         The Service Fee for any Field and for any Quarter shall be allocated 
         first to the reimbursement of advances calculated as provided above and
         then to compensation of the Contractors for providing the Operating
         Services hereunder. For each Quarter, the Operator shall provide the
         Affiliate with a separate statement for the reimbursement amount and an
         invoice for the compensation amount, in each case in the forms provided
         in the URS. If the Service Fee is insufficient to cover all
         reimbursements deemed due in a Quarter as provided in Article 6.2, then
         the shortfall will be carried over to the next Quarter and the
         Contractors will not receive any compensation component of the Service
         Fee for such Quarter.

  6.4    No Effect on Service Fee Calculation or Payment

         The rate of amortization of advances pursuant to this Article VI shall
         not affect in any manner whatsoever the calculation of the Service Fee
         for any Field or the total amount payable as the Service Fee by the
         Affiliate in respect of any Field and any Quarter.



                                       21
<PAGE>   97


                  SCHEDULE A

<TABLE>
<CAPTION>
     Area                          Percentage
     ----                          ----------
  <S>                                <C>
  Acema                               *   
  Ambrosio                            *   
  Bachaquero S. 0.                    *   
  Boqueron                            *   
  B2X-68/79                           *   
  B2X-70/80                           *   
  Cabimas                             *   
  Caracoles                           *   
  Casma-Anaco                         *   
  Cretacico Sur                       *   
  Dacion                              *   
  Intercampo N.                       *   
  Kaki                                *   
  La Concepcion                       *   
  La Vela Costa Afuera                *   
  LL-652                              *   
  Mata                                *   
  Maulpa                              *   
  Mene Grande                         *   
  Onado                               *   
</TABLE>


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.
<PAGE>   98
<ST,2,,0>Expenses<TA>0.20<et>% 



                                   SCHEDULE B
<TABLE>
<CAPTION>

 Quarter         T(q)                    Quarter        T(q)
   (q)                                     (q)
 ------------------------                ------------------------
  <S>            <C>                       <C>           <C>
   1             *                          42           *
   2             *                          43           *
   3             *                          44           *
   4             *                          45           *
   5             *                          46           *
   6             *                          47           *
   7             *                          48           *
   8             *                          49           *
   9             *                          50           *
   10            *                          51           *
   11            *                          52           *
   12            *                          53           *
   13            *                          54           *
   14            *                          55           *
   15            *                          56           *
   16            *                          57           *
   17            *                          58           *
   18            *                          59           *
   19            *                          60           *
   20            *                          61           *
   21            *                          62           *
   22            *                          63           *
   23            *                          64           *
   24            *                          65           *
   25            *                          66           *
   26            *                          67           *
   27            *                          68           *
   28            *                          69           *
   29            *                          70           *
   30            *                          71           *
   31            *                          72           *
   32            *                          73           *
   33            *                          74           *
   34            *                          75           *
   35            *                          76           *
   36            *                          77           *
   37            *                          78           *
   38            *                          79           *
   39            *                          80           *
   40            *        
   41            *        
</TABLE>


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.
<PAGE>   99
ANNEX D

(Translation]

                         [FORM OF CONTRACTOR GUARANTEE]

                         GUARANTEE OF PROPER PERFORMANCE

     Reference is made to the Operating Agreement (the "Agreement") of even date
herewith among _____________. (together with its successors and assigns, the 
"Affiliate") a sociedad anonima organized under the laws of the Republic of 
Venezuela, _________________ (the "Guaranteed Entity") a ________________
organized under the laws of __________________, and ________________, a
_________________ organized under the laws of ___________________.

     With regard to the obligations assumed by the Guaranteed Entity under the
Agreement or that may be imposed upon the Guaranteed Entity under or in
connection with the Agreement, ____________________ (the "Guarantor"), a
________________ organized under the laws of __________________, an Associated
Entity of the Guaranteed Entity, agrees as follows:

1.   Capitalized terms used herein and not otherwise defined shall have the
     meanings set forth in the Agreement.

2.   The Guarantor hereby expressly represents and warrants to the Affiliate
     that: (i) it is duly organized, validly existing and in good standing under
     the laws of its jurisdiction of organization, (ii) it has all requisite
     corporate power and authority to execute, deliver and perform this
     Guarantee, (iii) the execution, delivery and performance of this Guarantee
     have been duly authorized by all necessary corporate action, (iv) this
     Guarantee constitutes the legal, valid and binding obligation of the
     Guarantor, enforceable against the Guarantor in accordance with its terms,
     (v) no governmental approvals are required in connection with the
     execution, delivery and performance of this Guarantee, except as have been
     obtained and are in force, and (vi) the execution, delivery and performance
     of this Guarantee by the Guarantor will not violate any provision of any
     existing law or regulation to which the Guarantor is subject or any
     provision of the Guarantor's constitutive documents or of any material
     agreements to which it may be a party.

3.   The Guarantor hereby unconditionally and irrevocably guarantees to the
     Affiliate, as a primary obligor, the due and punctual performance of all of
     the obligations of the Guaranteed Entity under or in connection with the
     Agreement. If the Guaranteed Entity fails to perform any such obligation in
     the manner and at the time required, the Guarantor shall perform or procure
     the performance of such obligation upon demand by the Affiliate.


- --------------------

(1) Add or delete spaces as appropriate to reflect the number of Contractors.




<PAGE>   100



4.   This Guarantee is irrevocable and unconditional and shall remain in full
     force and effect until all obligations of the Guaranteed Entity under or in
     connection with the Agreement are fully and irrevocably satisfied and
     discharged, notwithstanding (a) any amendment or termination of the
     Agreement, (b) any extension of time or other indulgence or concession
     granted by the Affiliate, or (c) any delay or failure by the Affiliate in
     pursuing any remedies available against the Guaranteed Entity.
     Notwithstanding the foregoing, this Guarantee shall terminate with respect
     to liabilities arising from improper abandonment of wells or facilities in
     any area outside a Field or in any Field on the fifth anniversary of the
     termination of the Agreement with respect to such area or Field.

5.   The provisions contained in Article 547 of the Commercial Code of Venezuela
     will be fully applicable to this Guarantee. Accordingly, the Affiliate
     shall have no obligation to pursue any remedy or take any action against or
     in respect of the Guaranteed Entity prior to enforcing its rights under
     this Guarantee directly against the Guarantor. In addition, the Guarantor
     may not claim that the Affiliate could have avoided or mitigated, in any
     manner or through any action, the damages resulting from a default of the
     Guaranteed Entity under the Agreement or resort to any other guarantee held
     at any time in its favor, before proceeding against the Guarantor in
     connection with its obligations under this Guarantee. The Guarantor's
     obligations under this Guarantee shall be independent and absolute, and the
     Guarantor shall have no right of setoff or counterclaim with respect to any
     other claims it may have against the Affiliate or any other Person.

6.   All of the obligations of the Guarantor set forth herein shall bind the
     Guarantor and its successors. The Guarantor may not assign or delegate its
     duties or obligations hereunder without the prior written consent of the
     Affiliate, and any purported assignment or delegation without such consent
     shall be null and void. The Guarantor confirms that this Guarantee shall
     remain in effect with respect to any assignee of the Guaranteed Entity
     under the Agreement that is an Associated Entity of the Guaranteed Entity.
     Upon any such assignment the assignee shall be considered the Guaranteed
     Entity for all purposes hereunder to the extent of the assigned
     obligations. The Guarantor additionally confirms that any assignee of the
     Affiliate under the Agreement permitted in accordance with Clause 27.3 of
     the Agreement may exercise all rights and remedies of the Affiliate under
     this Guarantee. No other person or entity shall be a beneficiary of this
     Guarantee or have or acquire any rights by reason of this Guarantee.

7.   This Guarantee shall be governed by and construed in accordance with the
     laws of the Republic of Venezuela.

8.   Any failure or delay by the Affiliate to exercise any right, in whole or in
     part, hereunder shall not be construed as a waiver of the right to exercise
     the same or any other right.

9.   No amendment or modification of this Guarantee shall be effective unless in
     writing and signed by the Guarantor and the Affiliate.

10.  Any dispute concerning the legal interpretation or construction of this
     Guarantee shall be settled exclusively and finally by arbitration conducted
     in accordance with the Rules of the



                                       2
<PAGE>   101



     International Chamber of Commerce ("ICC"). The Affiliate shall select an
     arbitrator and the Guarantor shall select an arbitrator in accordance with
     the ICC Rules. The arbitrators so nominated shall then agree within 30 days
     on a third arbitrator to serve as Chairman. The arbitration shall be
     conducted in New York City (United States of America). Notwithstanding the
     foregoing, in the event that a dispute involves both the Guarantor and the
     Guaranteed Entity, arbitration shall be conducted in accordance with Clause
     23.2 of the Agreement, as a single proceeding, and Guarantor and the
     Guaranteed Entity shall jointly have the rights of the Guaranteed Entity
     under such Clause 23.2.

11.  The Guarantor shall pay upon demand and presentation of invoices all
     reasonable and actual costs and expenses incurred by the Affiliate in
     connection with the successful enforcement of this Guarantee, including,
     without limitation, reasonable fees and expenses of counsel.

12.  All notices, demands, instructions, waivers or other communications to be
     provided pursuant to this Guarantee. and any consents contemplated in this
     Guarantee, shall be in writing in Spanish or English, shall be effective
     upon receipt, and shall be sent by personal delivery, courier, first class
     mail, facsimile or telex, to the following addresses:

     i)  If to the Guarantor, to:

     ii) If to the Affiliate, to:

     The addresses and telex and facsimile numbers of either party for notices
     given pursuant to this Guarantee may be changed by means of a written
     notice given to the other party at least 15 Business Days prior to the
     effective date of such change.

13.  This Guarantee is being executed in both the Spanish language and the
     English language. The Spanish version shall constitute the binding version,
     and the English version is being executed as a matter of reference only.

14.  This Guarantee may be executed in any number of counterparts, each of which
     shall be deemed to be an original.





                                        3
<PAGE>   102

This Guarantee has been duly executed by the Guarantor and the Affiliate by
their respective officers thereunto duly authorized as of the ___ day of
______________,1997.


                                             NAME OF GUARANTOR)


                                             By:                              
                                                ------------------------------
                                             Name:                            
                                                  ----------------------------
                                             Title:                           
                                                   ---------------------------


ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By:
   ------------------------------
Name:
     ----------------------------
Title:
      ---------------------------



                                       4
<PAGE>   103
ANNEX E


(Translation]


                           DEVELOPMENT PLAN GUIDELINES


     This Annex sets forth the topics required to be covered in a Development
Plan submitted to the Affiliate for approval, to the extent applicable to the
relevant Field. While this Annex describes the general requirements of the
Development Plan and incorporates those set forth in Clauses 6.2 and 8.4 of the
Agreement, there is no detailed prescription of the format or the level of
detail to be presented, other than coverage of the key topics identified herein.
Additional information may be presented in a Development Plan to the extent
appropriate to the relevant activities.

1.   Description of Field.

     (a) Description of the Field to be developed.

     (b) Field Boundaries of the Field to be developed.

     (c) Description of the Hydrocarbon-bearing formations to constitute the
         Field.

2.   Reserves and Production.

     (a) An estimate of proved, probable and possible reserves in the Field for
         each reservoir (in each case, determined on a life-of-field basis,
         without regard to the duration of the Operation Period), separated by
         Liquid Hydrocarbons (separately for crude oil, condensate and natural
         gas liquids) and Natural Gas.

     (b) An estimate of the production profile for each reservoir of the
         Hydrocarbons that the Contractors expect to deliver to the Affiliate in
         each year during the Operation Period for the proved and proved plus
         probable reserves cases (separately indicating the amount of projected
         Incremental Production), and an explanation of how the production
         profile in the proved reserve case achieves the Maximum Economic Rate
         of Production (unless Production is constrained by the Delivery Point
         Capacity)

3.   Description of Proposed Activities.

     (a) Description of the proposed rehabilitation, reactivation, enhancement
         or development scheme, as applicable, including the following:




<PAGE>   104



         (i)   General description of expected activities for the relevant
               Operation Period.

         (ii)  Description of planned facilities, both inside and outside of
               Field Boundaries.

         (iii) Description of drive mechanism and reservoir management policy.

         (iv)  The designation of additional Delivery Points that the
               Contractors plan to use in accordance with Clause 15.3 of the
               Agreement and Hydrocarbon Transportation and Handling
               arrangements, including routing to Delivery Points, type of
               Transportation and Handling facilities and expected use of
               Affiliate or third party facilities.

         (v)   Expected arrangements for abandonment of facilities to be
               utilized in the course of the work program.

     (b) Plan for the periodic inspection of all inactive wells in the Initial
         Field at least twice per year and, unless otherwise agreed by the
         Affiliate in its discretion, a plan for the periodic surveillance of
         subsidence in around the Area that may be affected by Production.

     (c) Principal contingent features of proposed activities, and likely
         additional activities to be undertaken depending on results of
         specified initial activities.

     (d) Alterative approaches considered and reasons for choice of approach
         selected.

     (e) Schedule of activities, including expected schedule for construction or
         acquisition of major facilities and timetable for achieving commercial
         production rates (for Fields not currently in production) and Maximum
         Economic Rate (or Delivery Point Capacity).

     (f) Plan for the transfer of operations in accordance with Clause 11.8 of
         the Agreement.

4.   Budget and Economics.

     (Note: All financial information should be expressed in constant dollars, 
     with no adjustment for inflation.)

     (a) Projected & capital and operating expenditures for the Operation Period
         for proved and proved plus probable reserves cases, prepared in
         accordance with the Uniform Reporting System, including (for the
         Initial Field) confirmation that the Minimum Work Obligation will be
         met.

     (b) Sharing and allocation arrangements, including:



                                       2
<PAGE>   105



         (i)   Arrangements for Fields extending outside the Area, adopted or
               expected to be adopted pursuant to Clause XIII of the Agreement.

         (ii)  Any arrangements for sharing of facilities or other costs, or for
               commingling and reallocation of Production, whether in respect of
               other Fields or otherwise, and guidelines for effecting
               allocations under Article 5.4 of the Accounting Procedures.

     (c) Contractor Participations in Field.

     (d) Expected Field returns and discounted cash flow analysis, in each case
         based on assumptions to be set forth in the Development Plan (including
         such reasonable assumptions as may be required by the Affiliate by
         notice to the Operator from time to time).

     (e) An estimate of the Service Fees that the Contractors expect to be
         payable by the Affiliate during each year of the Operation Period for
         each reserves case.

     (f) Expected duration of pre-operative phase, if any.

5.   Safety and Environmental Considerations.

     (a) Description of environmental program and contingency plans to be
         established pursuant to Clause 22.1 of the Agreement.

     (b) Description of program for protection of safety of personnel and other
         safety related programs.

6.   Additional Information for Amendments and Updates.

     (a) Reasons for proposed amendment or update.

     (b) Discussion of activities conducted since original Development Plan or
         previous amendment or update, as the case may be.

     (c) Revised presentation of all information described in clauses 1 through
         4 above (or, to the extent appropriate, only such information as is 
         being amended or updated).





                                        3
<PAGE>   106
                                                                   BOQUERON AREA

ANNEX F



                        Initial Contractor Participations


<TABLE>
<S>                                                   <C>   
             Union Texas Venezuela Ltd.               66.67%
             Preussag Energie GmbH                    33.33%
</TABLE>




<PAGE>   107
ANNEX G

[Translation]


                      FORM OF OPERATOR ACCESSION AGREEMENT

(Date]

[Affiliate] 
[Address]

[Contractor 1]
[Contractor 2]
c/o [Contractor 1]
[Address]

       Re:    Accession to Operating, Agreement

Ladies and Gentlemen:

     We address you on this opportunity in order to refer to the Operating
Agreement (the "Agreement"), dated ____________ 1997, between [Affiliate], 
[Contractor I] and [Contractor 2].

     [Name of Operator) (the "0perator") agrees to perform fully all of the
obligations and responsibilities attributed to it under the Agreement, to the
extent and in the manner in which they are set forth.

     In addition, the Operator acknowledges all the rights to which it has
become entitled under the Agreement, which it hereby assumes and may fully
exercise.

     This accession agreement shall be governed by, and construed in accordance
with, the laws of the Republic of Venezuela.


                                           Very truly yours,

                                           [NAME OF OPERATOR]

                                           By:
                                              ------------------------------
                                           Name:
                                           Title:


- --------------------

(1) Add or delete as appropriate to reflect the number of Contractors.

<PAGE>   108

                                    ANNEX H
                            DELIVERY OF HYDROCARBONS
                                 BOQUERON AREA


1.    DELIVERY POINT OF LIQUID HYDROCARBONS

      La Toscana manifold inlet (gross production).

2.    QUALITY OF LIQUID HYDROCARBONS AT THE DELIVERY POINT

      Liquid Hydrocarbons must meet the following conditions:

      Gravity:                         > 22 degrees API
                                       -
      Sand content:                    < 0.05%
                                       -     
      Sulfur:                          < 1.5% in weight
                                       -
      Wax, paraffins and asphaltines:  Contractors must prevent precipitation
                                       upstream of Delivery Point and cooperate
                                       with the Affiliate for such prevention
                                       downstream of Delivery Point.

3.    DELIVERY POINT CAPACITY OF LIQUID HYDROCARBONS

      20 MBD gross (with a maximum of 1% of water content).

4.    DELIVERY POINT OF ASSOCIATED GAS

      La Toscana manifold inlet.

5.    QUALITY OF DELIVERED ASSOCIATED GAS

      Delivered Associated Gas must meet the following conditions:

      C0(2) Content:                    < 5% molar
                                        -  
      Water Content:                    < 7 Pounds/MSCF
                                        -
      H(2)S Content:                    < 15 ppmv
                                        -



BOQUERON AREA                         H-1
<PAGE>   109

                                     ANNEX I
                               BASELINE PRODUCTION
                                  BOQUERON AREA


Baseline Production
Decline Factor:            0.10 annually

Deemed Cost
of Baseline Production:    1.25 $/NB



BOQUERON AREA                          I-1
<PAGE>   110

ANNEX J

[Translation]

                          [FORM OF OPERATOR GUARANTEE]

                         GUARANTEE OF PROPER PERFORMANCE
                         -------------------------------

     Reference is made to the Operating Agreement dated ____________ among
____________ (together with its successors and assigns, the "Affiliate"), a
sociedad anonima organized under the laws of the Republic of Venezuela;
___________________, a ____________________ organized under the laws of
____________________; and _________________, a __________________ organized
under the laws of _________________; (1) and to which __________________ (the 
"Operator"), a __________________ organized under the laws of ______________,
has become a party pursuant to an Accession Agreement of even date herewith.

     With regard to the obligations assumed by the Operator under the Operating
Agreement, or that may be imposed upon the Operator under or in connection with
the Operating Agreement, ___________________ (the "Guarantor"), a
_______________ organized under the laws of __________________, an Associated
Entity of the Operator, agrees as follows:

1.   Capitalized terms used herein and not otherwise defined shall have the
     meanings set forth in the Operating Agreement.

2.   The Guarantor hereby expressly represents and warrants to the Affiliate
     that, (i) it is duly organized, validly existing and in good standing
     under the laws of its jurisdiction of organization, (ii) it has all
     requisite corporate power and authority to execute, deliver and perform
     this Guarantee, (iii) the execution, delivery and performance of this
     Guarantee have been duly authorized by all necessary corporate action, (iv)
     this Guarantee constitutes the legal, valid and binding obligation of the
     Guarantor, enforceable against the Guarantor in accordance with its terms,
     (v) no governmental approvals are required in connection with the
     execution, delivery and performance of this Guarantee, except as have been
     obtained and are in force, and (vi) the execution, delivery and performance
     of this Guarantee by the Guarantor will not violate any provision of any
     existing law or regulation to which the Guarantor is subject or any
     provision of the Guarantor's constitutive documents or of any material
     agreements to which it may be a party.

3.   The Guarantor hereby unconditionally and irrevocably guarantees to the
     Affiliate, as a primary obligor, the due and punctual performance of all
     of the obligations of the Operator under or in connection with the
     Operating Agreement. If the Operator fails to perform any such obligation
     in the manner and at the time required, the Guarantor shall perform or
     procure the performance of such obligation upon demand by the Affiliate.


- ----------------------

(1) Add or delete spaces as appropriate to reflect the number of Contractors.


<PAGE>   111



4.   This Guarantee is irrevocable and unconditional and shall remain in full
     force and effect until all obligations of the Operator under or in
     connection with the Operating Agreement are fully and irrevocably satisfied
     and discharged, notwithstanding (a) any amendment or termination of the
     Operating Agreement, (b) any extension of time or other indulgence or
     concession granted by the Affiliate, or (c) any delay or failure by the
     Affiliate in pursuing any remedies available against the Operator. 
     Notwithstanding the foregoing, this Guarantee shall terminate with respect
     to liabilities arising from improper abandonment of wells or facilities in
     any area outside a Field or in any Field on the fifth anniversary of the
     termination of the Operating Agreement with respect to such area or Field.

5.   The provisions contained in Article 547 of the Commercial Code of Venezuela
     will be fully applicable to this Guarantee. Accordingly, the Affiliate
     shall have no obligation to pursue any remedy or take any action against or
     in respect of the Operator prior to enforcing its rights under this
     Guarantee directly against the Guarantor. In addition, the Guarantor may
     not claim that the Affiliate could have avoided or mitigated, in any manner
     or through any action, the damages resulting from a default of the Operator
     under the Operating Agreement or resort to any other guarantee held at any
     time in its favor, before proceeding against the Guarantor in connection
     with its obligations under this Guarantee. The Guarantor's obligations
     under this Guarantee shall be independent and absolute, and the Guarantor
     shall have no right of set-off or counterclaim with respect to any other
     claims it may have against the Affiliate or any other Person,

6.   All of the obligations of the Guarantor set forth herein shall bind the
     Guarantor and its successors. The Guarantor may not assign or delegate its
     duties or obligations hereunder without the prior written consent of the
     Affiliate, and any purported assignment or delegation without such consent
     shall be null and void. The Guarantor confirms that this Guarantee shall
     remain in effect with respect to any assignee of the Operator under the
     Operating Agreement that is an Associated Entity of the Operator. Upon any
     such assignment the assignee shall be considered the Operator for all
     purposes hereunder to the extent of the assigned obligations. The Guarantor
     additionally confirms that any assignee of the Affiliate under the
     Operating Agreement permitted in accordance with Clause 27.3 of the
     Operating Agreement may exercise all rights and remedies of the Affiliate
     under this Guarantee. No other person or entity shall be a beneficiary of
     this Guarantee or have or acquire any rights by reason of this Guarantee.

7.   This Guarantee shall be governed by and construed in accordance with the
     laws of the Republic of Venezuela.

8.   Any failure or delay by the Affiliate to exercise any right, in whole or in
     part, hereunder shall not be construed as a waiver of the right to exercise
     the same or any other right.

9.   No amendment or modification of this Guarantee shall be effective unless in
     writing and signed by the Affiliate and the Guarantor.

10.  Any dispute concerning the legal interpretation or construction of this
     Guarantee shall be settled exclusively and finally by arbitration conducted
     in accordance with the Rules of the




                                        2


<PAGE>   112
     International Chamber of Commerce ("ICC"). The Affiliate shall select an
     arbitrator and the Guarantor shall select an arbitrator in accordance with
     the ICC Rules. The arbitrators so nominated shall then agree within 30 days
     on a third arbitrator to serve as Chairman. The arbitration shall be
     conducted in New York City (United States of America). Notwithstanding the
     foregoing, in the event that a dispute involves both the Guarantor and the
     Operator, arbitration shall be conducted in accordance with Clause 23.2 of
     the Operating Agreement, and the Guarantor and the Operator shall jointly
     have the rights of the Operator under such Clause 23.2.

11.  The Guarantor shall pay upon demand and presentation of invoices all
     reasonable and actual costs and expenses incurred by the Affiliate in
     connection with the successful enforcement of this Guarantee, including,
     without limitation, reasonable fees and expenses of counsel.

12.  All notices, demands, instructions, waivers or other communications to be
     provided pursuant to this Guarantee, and any consents contemplated in this
     Guarantee, shall be in writing in Spanish or English, shall be effective
     upon receipt, and shall be sent by personal delivery, courier, first class
     mail, facsimile or telex, to the following addresses:

     i)  If to the Guarantor, to:



     ii) If to the Affiliate, to:



     The addresses and telex and facsimile numbers of either party for notices
     given pursuant to this Guarantee may be changed by means of a written
     notice given to the other party at least 15 Business Days prior to the
     effective date of such change.

13.  This Guarantee is being executed in both the Spanish language and the
     English language. The Spanish version shall constitute the binding version,
     and the English version is being executed as a matter of reference only.

14.  This Guarantee may be executed in any number of counterparts, each of which
     shall be deemed to be an original.





                                        3




<PAGE>   113



This Guarantee has been duly executed by the Guarantor and the Affiliate by
their respective officers thereunto duly authorized as of the ___ day of
_______________, 1997.


                                         [NAME OF GUARANTOR]

                                         By:
                                            ------------------------------
                                         Name:
                                              ----------------------------
                                         Title:
                                               ---------------------------

ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By:
   -----------------------------
Name:
     ---------------------------
Title:
      --------------------------




                                       4
<PAGE>   114

ANNEX K

[TRANSLATION]


                      MODEL JOINT OPERATING TERMS FOR EPIC

                                       I

                                   DEFINITIONS(1)


     Capitalized terms defined in the Agreement (as defined below) or the
     Accounting Procedures (as defined in the Agreement) have the respective
     meanings assigned to such terms therein. The following definitions are in
     addition to and supplement those set forth in the Agreement and the
     Accounting Procedures.

     "Agreement" shall mean the Operating Agreement to which these Model Terms
     are an Annex.

     "Advances" shall mean each payment of cash made or required to be made
     pursuant to a valid Cash Call.

     "Cash Call" shall mean any request for payment made by the Operator in
     accordance with Article IV of these Model Terms.

     "Contractor Agreement" shall mean any agreement or contract, whether oral
     or written, among some or all of the Other Contractors or between the Other
     Contractors and the Operator (in its capacity as such) with respect to
     their respective rights or obligations under the Agreement, as such
     agreement or contract may be amended or supplemented from time to time.

     "Joint Bank Account" shall have the meaning set forth in Article 4.1.

     "Management Committee" shall have the meaning set forth in Article 6.1.

     "Model Terms" shall mean these Model Joint Operating Terms for EPIC, as
     they may be amended or supplemented from time to time.

- ----------------------

(1)  Definitions in this English translation are presented in alphabetical order
     in English for ease of reference. Accordingly, the order of these
     definitions does not match the order in the definitive Spanish version.




<PAGE>   115

     "Permitted Expenditures" shall mean:

          (i)  Chargeable Expenditures;

          (ii) other expenditures that (a) relate to and are necessary for the
               provision of Operating Services or other activities under the
               Agreement, (b) are also paid by the Other Contractor(s), and (c)
               are of a kind and in amounts that are customarily charged to
               contractors under international joint operating agreements; and

         (iii) other expenditures that EPIC agrees to pay.

                                       II

                                      SCOPE

     Absent express written agreement to the contrary by EPIC, these Model Terms
     shall govern relations between EPIC and the Operator and EPIC and the Other
     Contractors and shall create a binding contractual relationship,
     enforceable against each of them in accordance with its terms.

     Except as the Other Contractors and/or the Operator may agree, these Model
     Terms will not affect any Contractor Agreement or any other aspect of
     relations between or among the Other Contractors and/or the Operator.

                                      III

                               NON-DISCRIMINATION

     As a general matter, in all matters relating to the Agreement and the
     Contractors' rights and obligations thereunder, the Operator and the Other
     Contractors shall not discriminate against EPIC, shall afford EPIC the same
     rights, access to information and other benefits as are enjoyed by Other
     Contractors under any Contractor Agreement or otherwise (taking into
     account the level of EPIC's Participation) and shall treat EPIC no less
     favorably than any Other Contractor with the same Participation is or would
     be treated by the Operator and/or Other Contractors under a Contractor
     Agreement or otherwise; provided that, unless it expressly agrees to the
     contrary in writing, EPIC shall at all times be entitled to the minimum
     rights, benefits and treatment provided in these Model Terms.

                                       IV

                       BANK ACCOUNTS; CASH CALLS; DEFAULT

4.1  (a) If it has not already done so, the Operator shall establish and 
     maintain one or more bank accounts (the "Joint Bank Accounts") in Dollars 
     (and in Bolivars, if there are Cash



                                        2
<PAGE>   116



     Calls in Bolivars), into which Advances and the Service Fee will be
     deposited and from which Permitted Expenditures will be paid by or
     reimbursed to the Operator. Payments of the Service Fee shall be held in a
     Joint Bank Account in Dollars and distributions of net amounts to EPIC
     shall be made in Dollars.

     (b) The Operator shall distribute cash from a Joint Bank Account to EPIC in
     proportion to EPIC's Participation in the Field (or, in the case of any
     reimbursement of unused Advances, Exploration Activity) concerned, at the
     same time as it distributes any cash from such Joint Bank Account to any
     Other Contractor (including the Operator itself in its capacity as a
     Contractor).

     (c) The Joint Bank Accounts shall be managed and Cash Calls made with a
     goal of minimizing the amount of idle cash in the Joint Bank Accounts, to
     the extent consistent with the needs of the Operator to perform the
     Operating Services contemplated in the Agreement.

4.2  The Operator shall make Cash Calls to EPIC in accordance with the
     procedures set forth herein to provide for the orderly funding by EPIC of
     its Participation in Permitted Expenditures. Cash Calls may be made by the
     Operator to fund any Permitted Expenditures. Cash Calls in respect of each
     Field or Exploration Activity may be made to EPIC in proportion to its
     respective Participation in the Field or Exploration Activity concerned
     only at the same time and in the same manner that Cash Calls with respect
     to the Permitted Expenditures concerned are made to all Other Contractors
     having a Participation in such Field or Exploration Activity. In addition,
     all Cash Calls to EPIC will be subject to the following conditions:

          (i) No later than fourteen calendar days prior to the beginning of
          each calendar month, the Operator shall furnish EPIC with a notice of
          (a) the Cash Call(s) being made for such calendar month and (b) an
          estimate of the Cash Calls that will be made for the three following
          calendar months. The amount requested in the Cash Call notice for any
          month shall be the Operator's estimate of the amount and currencies
          that will be payable in such calendar month in respect of the relevant
          Permitted Expenditures, taking into account cash already on hand and
          net of any Service Fee that the Operator expects to receive in such
          calendar month (to the extent that the Operator nets the Service Fee
          with respect to the Other Contractors), plus a reserve for
          contingencies in amounts consistent with normal industry practice.
          Each Cash Call notice sent to EPIC shall specify the amount applicable
          to each Field and to each Exploration Activity relevant to EPIC. Each
          Cash Call notice shall identify the budget items or AFE's (or main
          groupings of budget items or AFE'S) for which the funds are required
          and the amounts attributable to each such budget item or AFE (or
          grouping thereof).

          (ii) Cash Call(s) made in such notice for the coming calendar month
          shall be paid by EPIC no later than the first Business Day of such
          calendar month or such later Business Day as may be specified in the
          notice. Where Cash Calls are for




                                        3
<PAGE>   117


          more than $1.0 million (or the equivalent in another currency), EPIC
          will have the right to pay the Cash Calls in two or more installments
          during the course of the month in implementation of the principle
          stated in Article 4.1(c); provided that the timing of payment is
          consistent with the Operator's needs for funding.

          (iii) With respect to any Cash Calls made to the Other Contractors
          (or in the case of a single Other Contractor, any Permitted
          Expenditures actually made by such Other Contractor) prior to the date
          of execution and delivery of the Agreement by EPIC, EPIC shall pay the
          Operator its Participation in such Cash Calls (or such Permitted
          Expenditures) on the first Business Day that is or follows the latest
          of: (a) 30 calendar days following the date EPIC executes and delivers
          the Agreement, (b) five Business Days following receipt of an
          appropriate Cash Call notice from the Operator, and (c) the date on
          which such Cash Call is to be paid by the Other Contractors.

          Where the Other Contractors have paid a Cash Call (or a single Other
          Contractor has made a Permitted Expenditure) prior to the date on
          which EPIC pays its Participation in such Cash Call (or Permitted
          Expenditure), EPIC shall also pay interest on the amount of such
          Participation from and including the date of payment by the Other
          Contractor(s) to but excluding the date of payment by EPIC, at a rate
          for each day equal to *.

          (iv) Cash Calls to EPIC may be made only in Bolivars or Dollars. Each
          Cash Call shall specify, in respect of each Advance, the currency
          required and the Joint Bank Account to which payment is to be made.
          Payments of all Cash Calls shall be made to such Joint Bank Account,
          in funds available for withdrawal by the Operator on the date on which
          the payments are due. Whenever a Cash Call is made in Bolivars or
          Dollars for a funding need in another currency, the Operator shall
          purchase the appropriate amount of the required currency with Bolivars
          or Dollars, as the case may be, in an arms' length transaction from a
          bank of international reputation.

4.3       In the event that amounts are payable in respect of Permitted 
          Expenditures for which a Cash Call may be made by the Operator, and
          there is not sufficient cash on hand Advanced by the relevant
          Contractors to meet such Permitted Expenditures, the Operator shall
          give notice to each of EPIC and the relevant Other Contractors
          requesting that it fund its Participation in a special Cash Call. If
          EPIC elects not to provide such funding or does not respond in a
          timely manner, the Operator may advance EPIC's Participation in such
          amounts, if the Operator could; if necessary, simultaneously advance
          the respective Participations of the relevant Other Contractors.
          Amounts so advanced on behalf of EPIC shall be included in the Cash
          Call to EPIC for the next month (or for the following month, if the
          latest date for the notification of a Cash Call for the next month has
          passed before the date of such advance). The Operator shall receive
          interest on each such advance from and including the date of the
          advance, to but excluding the date of reimbursement, at a rate for
          each day in such period equal to the lower of (i) the lowest rate
          charged any Other

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



                                       4
<PAGE>   118
          Contractor with respect to advances made at the same time and (ii)
          LIBOR for such day. The related Cash Call shall include an amount
          sufficient to pay such interest.

4.4       (a) All Cash Calls made by the Operator shall be paid by EPIC,
          regardless of whether it disputes the correctness of such Cash Calls.
          If the Operator makes an improper Cash Call in bad faith or repeatedly
          makes improper Cash Calls, such error or errors shall constitute a
          breach by the Operator of its obligations under these Model Terms,
          Payment of any Advance will not prejudice EPIC's right to protest or
          question the correctness of the related Cash Call.

          (b) EPIC shall have the right to require that one audit of Permitted
          Expenditures, Cash Calls, Advances, Joint Bank Accounts and related
          matters be performed in any Calendar Year, at its own expense, by a
          firm of independent auditors of recognized international standing with
          expertise in Venezuelan accounting principles. Such audit may cover
          any or all such matters relating to the current Calendar Year or the
          two preceding Calendar Years. EPIC shall give at least 30 days' notice
          to the Operator of its intention to conduct such an audit. Audits
          shall be conducted in a manner so as to minimize disruptions to the
          Operator's activities. The Operator shall cooperate with the auditors,
          including providing access to all relevant facilities during regular
          business hours and providing appropriate assistance to the auditors.

          Notwithstanding the previous paragraph, if the items as to which EPIC
          requests an audit have already been audited once as part of the annual
          audit required by Clause 18.3 of the Agreement and Article 3.1 of the
          Accounting Procedures and a second time as part of an additional audit
          requested either by the Affiliate pursuant to Article 3.2 of the
          Accounting Procedures or by one or more Other Contractors pursuant to
          a Contractor Agreement or otherwise, EPIC will not have the right to
          require a third audit.

4.5       (a) If EPIC fails to pay any Cash Call when due, the Operator or any
          Other Contractor may give EPIC a notice of default. EPIC will have
          five Business Days from the giving of such notice in which to make up
          the Cash Call without penalty. If it fails to make up the Cash Call
          within such five Business Days, (i) EPIC will lose the right to
          receive distributions of the Service Fee and the Operator will be
          entitled to apply any Service Fees payable to EPIC to the amount of
          the unpaid Cash Calls, and (ii) the net amount of such unpaid Cash
          Calls (after application of the Service Fee) will subsequently bear
          interest, at a rate for each day equal to *, from and including the
          date such amount was originally due to but excluding the earlier of
          (1) the date of payment of such amount, (2) the date of transfer of
          EPIC's Participation as provided in Article 4.5(b), and (3) the date
          of withdrawal by EPIC with respect to the Field concerned pursuant to
          Clause 20.4 of the Agreement. If any portion of a Cash Call remains
          unpaid 30 calendar days after such notice of default, EPIC will lose
          the right to vote on any Management Committee (but will not lose its
          right to receive information pursuant to Article V). Upon payment in
          full of all unpaid Cash Calls and interest thereon, EPIC's rights to
          receive the Service Fee and to vote will be immediately reinstated.

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       5
<PAGE>   119

          (b) At any time that the amount of such missed Cash Call plus interest
          thereon remains unpaid following 120 calendar days after the end of
          the five-Business Day period referred to in the previous paragraph,
          the Operator shall have the right, but not the obligation, to give
          notice to EPIC requiring EPIC to transfer its Participation in the
          Field(s) or Exploration Activity to which the missed Cash Call relates
          to the Other Contractors in such proportions as the Operator shall
          indicate in the notice, without payment of any compensation or
          consideration of any kind to EPIC. To this end, upon receipt of such
          notice, EPIC shall be deemed to have transferred all of its right,
          title and beneficial interest in and under the Agreement to such Other
          Contractors and to have empowered the Operator to execute on EPIC's
          behalf any documents required to effect such transfer. If requested,
          EPIC will execute a power of attorney in this regard and will do any
          and all acts required by applicable law or regulation in order to
          complete such transfer. In the event that any necessary governmental
          or other approvals are not timely obtained, EPIC shall hold its
          Participation concerned in trust for the Other Contractors designated
          in the Operator's notice of transfer. Upon the effectiveness of the
          transfer of EPIC's Participation as provided above, EPIC will cease to
          be a Contractor under the Agreement with respect to the Field or
          Exploration Activity concerned,

          For purposes of Clause XXVII of the Agreement, the Affiliate will be
          deemed to have approved the Transfers provided above in advance and no
          further approval by the Affiliate will be required.

          (c) Transfer of EPIC's Participation in the Field(s) or Exploration
          Activity concerned pursuant to Article 4.5(b) will not relieve EPIC of
          the obligation to pay the Operator the amount of the missed Cash Call
          together with interest thereon or of liability for any other
          obligations, financial or otherwise, that have vested, matured or
          accrued under the Agreement prior to such transfer.

4.6       Unless it otherwise agrees, EPIC shall have no liability in respect
          of late or missed Cash Calls to Other Contractors.

                                       V

                              ACCESS TO INFORMATION

5.1       Subject to Article 7.2(c)(2), the Operator and the Other Contractors
          shall promptly provide EPIC with copies of all documents,
          communications, reports, notices and other information that are
          provided to,or received from, the Affiliate, any Other Contractor or
          any ministry or agency of the Venezuelan government in connection with
          the Agreement, including without limitation the following:

               (i) preliminary and final versions of any Development Plan,
               Annual Work Program and Budget, AFE, proposal for an Exploration
               Activity or Final Well Report, and of any significant amendments
               thereto; and




                                       6
<PAGE>   120

               (ii) any significant commentary disagreement, dispute, approval,
               response or other communications with regard to any of such
               documents;

     provided that magnetic tapes may be stored by the Operator and made
     available for inspection and/or copying at the expense of EPIC.

5.2  In addition, to the extent not already included under Article 5.1, the
     Operator shall promptly provide EPIC with copies of

               (i) all data and reports that are produced or compiled under the
               Uniform Reporting System;

               (ii) all monthly and annual reports produced pursuant to Article
               II of the Accounting Procedures;

               (iii) all audits and related information done or produced
               pursuant to Article III of the Accounting Procedures; and

               (iv) such additional information as EPIC may reasonably request,
               provided that it pays the costs of preparation of such additional
               information.

5.3  In general, the Operator shall afford EPIC access at all reasonable times
     to all facilities and installations used in connection with the Operating
     Services and to other data, information and documents acquired or produced
     in the conduct of the Operating Services and permit EPIC to make copies
     thereof at its own expense.

5.4  Notwithstanding the other provisions of this Article V, neither the
     Operator nor any Other Contractor shall be required to divulge proprietary
     technology to EPIC; provided that where the cost of development of
     proprietary technology has been included as a Permitted Expenditure to
     which EPIC has contributed, such proprietary technology shall be disclosed
     to EPIC and may be used by EPIC in other operations.

                                       VI

                           PARTICIPATION IN COMMITTEES

6.1  EPIC shall have the right to nominate one representative and one alternate
     representative to each operating committee, technical committee or similar
     body (each a "Management Committee") that is composed of representatives of
     the Contractors and has powers and duties with regard to authorizing and
     supervising Operating Services and other activities relating to the
     Agreement. EPIC shall have the right to change its representative and
     alternate at any time by giving notice to such effect to the Operator and
     the Other Contractors. EPIC shall be entitled to receive all notices and
     information (including, without limitation, proposed authorizations for
     expenditure) and to participate in meetings




                                       7
<PAGE>   121

     on the same basis as the Other Contractors, and to a vote on each
     Management Committee equal to its Participation from time to time.

6.2  If an operating committee and a technical committee have not already been
     formed pursuant to a Contractor Agreement or otherwise, the Other
     Contractor(s), the Operator and EPIC shall create an operating committee
     and technical committee, which shall each meet at least twice per year and
     shall have such powers and duties and operate according to such procedures
     as are customary in the international oil industry. The Operator shall
     provide EPIC with such notices, information and proposed authorizations for
     expenditure as are customary in the international oil industry.

6.3  If the requirements of Articles 6.1 or 6.2 are satisfied, decisions of the
     Management Committee concerned shall be conclusive and binding on EPIC to
     the extent that such decisions are also conclusive and binding on all Other
     Contractors; provided that (i) EPIC shall have no liability with respect to
     any activity or matter as to which it gives notice nonconsent under
     Articles 7.2(a), 7.3(a) or 7.4, and (ii) a Management Committee may not
     amend the Agreement or these Model Terms or modify EPIC's rights thereunder
     or hereunder without EPIC's written consent.

                                       VII

                PARTICIPATION IN FIELD DEVELOPMENTS; EXPLORATION
                     ACTIVITIES AND CERTAIN OTHER ACTIVITIES

7.1  Subject to its right to withdraw pursuant to Clause 20.4 of the Agreement
     and its right to transfer its Participation in a Field pursuant to Clause
     XXVII of the Agreement, EPIC shall be liable for its share of all
     Chargeable Expenditures relating to the Initial Field and for all other
     Permitted Expenditures reasonably related to such Field, and shall be
     entitled to its share of the Service Fee with respect to such Initial
     Field, for the entire Operation Period of such Initial Field. It shall
     otherwise have no right to withhold consent or otherwise to opt out of
     Operating Services performed with respect to the Initial Field.

7.2  (a) Subject to Article 7.2(c), EPIC shall have the right to participate in
     any Exploration Activity that is proposed to the Affiliate pursuant to
     Clause VIII of the Agreement. The Operator shall promptly give EPIC notice
     of any such proposal. At any time within the 10 calendar days following
     such notice (or within 48 hours if the proposed Exploration Activity
     involves use of a drilling rig that is standing by) EPIC may notify the
     Operator that it does not wish to participate in such Exploration Activity.
     Absent such notification of non-consent, EPIC will be deemed to have
     approved such Exploration Activity and will be liable for its Participation
     in all Permitted Expenditures in connection with such Exploration Activity,

     (b) In the event that EPIC notifies the Operator that it does not wish to
     participate in such an Exploration Activity, it will have no liability for
     any Permitted Expenditures or any



                                       8
<PAGE>   122
     other liabilities incurred in connection with such Exploration Activity.
     Thereafter, each of the Other Contractors participating in such Exploration
     Activity will indemnify EPIC from, and hold it harmless against, any costs,
     expenses (including without limitation reasonable legal costs, expenses and
     attorneys' fees) and liabilities incident to claims, demands or causes of
     action of every kind and character brought by or on behalf of any Person,
     for damage to or loss of property or the environment, or for injury to,
     illness or death of any Person, in each case to the extent such costs,
     expenses and liabilities arise from or are related to such Exploration
     Activity,

     (c) In the event that EPIC elects not to participate in an Exploration
     Activity as provided above, it will be deemed to have conclusively
     relinquished to the Other Contractors (1) all rights to participate in such
     Exploration Activity and in any additional exploration, appraisal or
     drilling activity that results directly therefrom, (2) all rights under
     these Model Terms to receive data or information relating to or resulting
     from such Exploration Activity or additional activities, and (3) all rights
     under the Agreement to have a Participation in the development of any
     Hydrocarbons discovered or appraised as a result of such Exploration
     Activity or additional activities,

     (d) Notwithstanding the provisions of Article 7.2(c), if any non-consenting
     Other Contractor has the option under a Contractor Agreement or otherwise
     to reinstate any of the rights described in Article 7.2(c), EPIC shall have
     the same option on the same terms and subject to the same conditions as
     such Other Contractor.

     (e) Further notwithstanding the provisions of Article 7.2(c), if an
     Exploration Activity in which EPIC does not participate leads either (1) to
     the development of a new Field whose development also results from
     Exploration Activities in which EPIC does participate or (2) to the
     extension of an existing Field in which EPIC has a Participation, EPIC
     shall have the option to have a Participation in the development of such
     new Field equal to its Participation in the Exploration Activities in which
     it did participate or to maintain its Participation in the existing Field.
     Such option shall be exercisable by giving notice to the Operator at any
     time during the 30 calendar days following the approval by the Affiliate of
     a Development Plan for such new Field or an amendment of the Development
     Plan for the existing Field.

     If EPIC gives such notice, it will be required to pay the Operator the full
     amount of its Participation in each Cash Call for Exploration Expenditures
     and other Permitted Expenditures related to the Exploration Activities in
     which EPIC did not participate, that was addressed to the Other Contractors
     prior to the date of such notice and has not already been paid by EPIC.
     The amount of each such Cash Call shall be paid to the Operator on the
     first Business Day that is or follows the latest of: (a) 30 calendar days
     following the date of such notice, (b) five Business Days following receipt
     of an appropriate Cash Call notice from the Operator, and (c) the date on
     which any such Cash Call is to be paid by the Other Contractors.



                                       9
<PAGE>   123

     If Other Contractors have paid such a Cash Call prior to the date on which
     EPIC pays its Participation in such Cash Call, EPIC shall also pay interest
     on the amount of such Participation from and including the date of payment
     by the Other Contractors to but excluding the date of payment by EPIC, at a
     rate for each day equal to LIBOR plus 1%.

7.3  (a) Subject to Article 7.2(c), EPIC shall have a Participation in any
     development proposed pursuant to Clause 8.4 of the Agreement, that
     corresponds to its Participation in the Exploration Activities that lead to
     such development, unless it notifies the Affiliate and the Operator at any
     time prior to approval of the related Development Plan by the Affiliate
     that it does not wish to participate in such development. Absent such
     notification, and subject to its right to withdraw pursuant to Clause 20.4
     of the Agreement and its right to transfer its Participation in a Field
     pursuant to Clause XXVII of the Agreement, EPIC shall be liable for its
     share of all Chargeable Expenditures, and be entitled to its share of the
     Service Fee, with respect to the Field concerned for the entire Operation
     Period of such Field. It shall Otherwise have no right to withhold consent
     or otherwise to opt out of Operating Services performed with respect to
     such Field.

     (b) In the event that EPIC notifies the Operator that it does not wish to
     participate in such Development Plan, it will have no liability for any
     Chargeable Expenditures or any other liabilities incurred in connection
     with such Development Plan or such Field after the giving of such notice.
     Thereafter, each of the Other Contractors participating in such Development
     Plan will indemnify EPIC from, and hold it harmless against, any costs,
     expenses (including without limitation reasonable legal costs, expenses and
     attorneys' fees) and liabilities incident to claims, demands or causes of
     action of every kind and character brought by or on behalf of any Person,
     for damage to or loss of property or the environment, or for injury to,
     illness or death of any Person, in each case to the extent such costs,
     expenses and liabilities arise from or are related to such Development Plan
     or the conduct of any activities with respect to such Field.

7.4  EPIC shall have the right to participate on the same terms and conditions
     as any Other Contractors (including the right to receive its pro rata share
     of any revenues realized in addition to the Service Fee), with a
     Participation equal to the largest Participation it then has with respect
     to a Field under the Agreement, in:

          (i) any infrastructure projects proposed pursuant to Clause 15.3 of
          the Agreement;

          (ii) any Natural Gas development negotiated pursuant to Clause XVI of
          the Agreement; and 

          (iii) any acquisition, construction or operation of any other
          facilities, installations or other assets which are to be used partly
          in connection with the Operating Services and partly in connection
          with other operations or to provide services to third parties.



                                       10
<PAGE>   124
                                      VIII

                           TRANSFER OF PARTICIPATIONS

8.1  Absent express written agreement to the contrary with one or more Other
     Contractors, EPIC will not be subject to, or have the benefit of, any
     restrictions on Transfers of Participations existing with respect to some
     or all of the Other Contractors under any Contractor Agreement (such as
     rights of first refusal, rights of first negotiation, "piggyback" rights,
     and other similar rights).

8.2  In any event, EPIC will be subject to the provisions of Clause XXVII of the
     Agreement, except as specifically provided to the contrary in Clause 3.3 of
     the Agreement.

                                       IX

                                 MISCELLANEOUS

9.1  These Model Terms shall be governed by and construed in accordance with the
     laws of the Republic of Venezuela. Disputes between EPIC and the Operator
     or any Other Contractor shall be resolved as provided in Clause 23.2 of the
     Agreement.

9.2  All notices, demands, instructions, waivers, consents or other
     communications to be provided pursuant to these Model Terms shall be given
     as provided in Clause XXVII of the Agreement,

9.3  To be binding, any amendment of these Model Terms must be effected by an
     instrument in writing signed by EPIC, the Operator and the Other
     Contractors. No further formalities shall be required to amend these Model
     Terms.

9.4  Rights hereunder may not be waived, except pursuant to a writing signed by
     the Party against which enforcement of the waiver is sought.

9.5  Notwithstanding anything to the contrary contained in these Model Terms, in
     no event shall any Party be liable to any other Party for any consequential
     damages or lost profits that such other Party might suffer. The Parties
     acknowledge that this provision is intended only to limit their liability
     to each other for consequential loss or damage and lost profits, and shall
     not be construed to so as to limit their liability to third parties or
     their right to seek indemnification for third party claims in accordance
     with any other Clause.

     The Operator and each Other Contractor shall indemnify EPIC from, and hold
     it harmless against, any loss, damage, cost or expense (including without
     limitation reasonable legal costs, expenses and attorneys' fees) incurred
     as a result of or arising from the gross negligence or willful misconduct
     respectively of the Operator or such Other Contractor in connection with
     activities relating to the Agreement,



                                       11
<PAGE>   125


     EPIC shall indemnify the Operator and each Other Contractor from, and hold
     it harmless against, any loss, damage, cost or expense (including without
     limitation reasonable legal costs, expenses and attorneys' fees) incurred
     as a result of or arising from the gross negligence or willful misconduct
     of EPIC in connection with activities relating to the Agreement.

     In the event that EPIC pays, or is held liable for, any cost, loss, damage
     or expense (other than EPIC's own costs of litigation) arising out of or in
     relation to any of the Operating Services or any other activity under the
     Agreement (including, without limitation, as a result of settlement of
     third party claims), that is in excess of EPIC's Participation in the
     Operating Services or activity giving rise to such cost, loss, damage or
     expense, each Other Contractor that pays, or is held liable for, a part of
     the total cost, loss, damage or expense that is less than its Participation
     in such Operating Services or activity shall promptly upon notice from EPIC
     pay to EPIC the amount of the shortfall. Similarly, EPIC shall be liable
     for contribution to some or all of the Other Contractors if it pays, or is
     held liable for, less than its Participation in any such cost, loss, damage
     or expense.

9.6  Nothing contained in these Model Terms or in the Agreement is intended to
     create, or shall be deemed or construed as creating, any legal entity
     between the Parties. No Party shall have the authority or right, or hold
     itself out as having the authority or right, to assume, create or undertake
     any obligation of any kind whatsoever, express or implied, on behalf of or 
     in the name of any other Party, except as expressly provided herein.



                                       12


<PAGE>   126
ANNEX L

[TRANSLATION]


                                 PRICE FORMULA


     For purpose of Clause 17.4 of the Agreement, the value of Hydrocarbons
other than Associated Gas for each calendar day in any given Quarter will be
determined in accordance with the appropriate formula set forth below.

     The average price for purposes of Clause 17.4 will be the arithmetic mean
of the prices for each calendar day in the Quarter, except Saturdays, Sundays,
and legal holidays in the place where price quotation referred to below is
taken, carried to three decimal places with fractions of 0.0005 or more being
rounded up.  If a quotation used in the applicable formula is unavailable for
any particular day, the most recent available quotation will be used.  

A. Liquid Hydrocarbons

1. For Liquid Hydrocarbons having an API gravity of 28 degrees or greater,

         *

2. For Liquid Hydrocarbons having an API gravity of 22 degrees to 27.9 degrees,

         *

3. For Liquid Hydrocarbons having an API gravity of 15 degrees to 21.9 degrees,

         *

4. For Liquid Hydrocarbons having an API gravity of 10 degrees to 14.9 degrees,

         *

*  Confidential portions of this page and pages 2, 3, 4, 5 and Exhibit 1 on
   this Annex L have been omitted pursuant to a request for confidential 
   treatment and filed separately with the Commission.







<PAGE>   127
*

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



                                       2



<PAGE>   128



     In the event that Platt's Oilgram Price Report at any time ceases to be
published or is otherwise unavailable, the Affiliate and the Contractors shall
agree on an alternative source of price information for the index crudes
concerned.  If any such index is unavailable from any source or if the
composition of such index changes so that it is no longer substantially
equivalent to the index as of the Effective Date, the Affiliate and the
Contractors shall agree on a new index or indexes, and on corresponding
modifications of the appropriate Price Formula as set forth above, so that such
new index(es) and modified Price Formula yield substantially the same
historical results as the initial index(es) and Price Formula.

     If the Affiliate and the Contractors are unable to agree on either (i)
whether one of the circumstances described in the preceding paragraph has
occurred, or (ii) the appropriate solution to such circumstance, within 60 days
following notification by one side to the other that agreement on such a matter
is required, either the Affiliate or the Contractors will have the right to
refer such matter to an independent expert for decision pursuant to Clause 23.3
of the Agreement.  The decision of the independent expert will be final and
binding.  Unless otherwise agreed by the Parties, the independent expert's
decision will be strictly limited to the matters described in the preceding
paragraph and no other issue relating to the Price Formula may be submitted for
independent expert review.


B. Natural Gas (except Associated Gas)

1. For Natural Gas from Cretacico Sur,

     *

2. For Natural Gas from La Concepcion,

     *

3. For Natural Gas from La Vela Costa Afuera,

     *

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       3
<PAGE>   129
*































* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.
<PAGE>   130

     *

     In the event that an official price for Natural Gas or high sulfur fuel
oil is no longer established for the relevant Venezuelan market pursuant to
government regulation, then for purposes of determining P(001) or FOP, as the
case may be, for the above formulae, the Affiliate and the Contractors shall
agree on an index or other source of price information that most accurately
indicates the actual, average daily selling price for Natural Gas or high
sulfur fuel oil, as the case may be, for industrial uses, that is charged by
the Affiliate or other major suppliers on the open market in the relevant
location, under term contracts.

     If the Affiliate and the Contractors are unable to agree on either (i)
whether one of the circumstances described in the preceding paragraph has
occurred, or (ii) the appropriate solution to such circumstance, within 60 days
following notification by one side to the other that agreement on such a matter
is required, either the Affiliate or the Contractors will have the right to
refer such matter to an independent expert for decision pursuant to Clause 23.3
of the Agreement. The decision of the independent expert will be final and
binding.  Unless otherwise agreed by the Parties, the independent expert's
decision will be strictly limited to the matters described in the preceding
paragraph and no other issue relating to the Price Formula may be submitted for
independent expert review.

* Confidential portion has been omitted pursuant to a request for
  confidential treatment and filed separately with the Commission.

                                       5
<PAGE>   131
Exhibit 1

               VALUES OF K(LCH) FOR PURPOSES OF THE PRICE FORMULAS

<TABLE>
<CAPTION>
- ------------------------------------------------
                     K(LCH) IN $/BARREL FOR
AREAS                INITIAL DELIVERY POINTS
- ------------------------------------------------
<S>                  <C>
Acema                          *  
- ------------------------------------------------
Ambrosio                       *  
- ------------------------------------------------
Bachaquero S. O.               *  
- ------------------------------------------------
Boqueron                       *
- ------------------------------------------------
B2X-68/79                      *
- ------------------------------------------------
B2X-70/80                      *
- ------------------------------------------------
Cabimas                        *
- ------------------------------------------------
Caracoles                      *
- ------------------------------------------------
Casma-Anaco                    *
- ------------------------------------------------
Cretacico Sur                  *
- ------------------------------------------------
Dacion                         *
- ------------------------------------------------
Intercampo N.                  *
- ------------------------------------------------
Kaki                           *
- ------------------------------------------------
La Concepcion                  *
- ------------------------------------------------
La Vela Costa Afuera           *
- ------------------------------------------------
LL-652                         *
- ------------------------------------------------
Mata                           *
- ------------------------------------------------
Maulpa                         *
- ------------------------------------------------
Mene Grande                    *
- ------------------------------------------------
Onado                          *
- ------------------------------------------------
</TABLE>

* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.
<PAGE>   132
ANNEX M

[Translation]

               [FORM OF GUARANTEE FOR MINIMUM WORK OBLIGATION](1)

         Reference is made to the Operating Agreement (the "Agreement") of even
date herewith among [name of Affiliate] (together with its successors and
assigns, the "Affiliate"), a sociedad anonima organized under the laws of the
Republic of Venezuela, ____________________ (the "Guaranteed Entity"), a
___________________ organized under the laws of ____________________ and
___________________ a ____________________ organized under the laws of
___________________, and ____________________, a ____________________ organized
under the laws of ____________________.

         ____________________ (the "Guarantor"), a ___________________ organized
under the laws of ____________________, and an Associated Entity of the
Guaranteed Entity, hereby agrees as follows:

1.       Capitalized terms used herein and not otherwise defined shall have the
         meanings set forth in the Agreement.

2.       The Guarantor hereby expressly represents and warrants to the
         Affiliate that:(i) it is duly organized, validly existing and in good
         standing under the laws of its jurisdiction of organization, (ii) it
         has all requisite corporate power and authority to execute, deliver
         and perform this Guarantee, (iii) the execution, delivery and
         performance of this Guarantee have been duly authorized by all
         necessary corporate action, (iv) this Guarantee constitutes the legal,
         valid and binding obligation of the Guarantor, enforceable against the
         Guarantor in accordance with its terms, (v) no governmental
         approvals are required in connection with the execution, delivery and
         performance of this Guarantee, except as have been obtained and are in
         force, and (vi) the execution, delivery and performance of this
         Guarantee by the Guarantor will not violate any provision of any
         existing law or regulation to which the Guarantor is subject or any
         provision of the Guarantor's constitutive documents or of any material
         agreements to which it may be a party.

3.       The Guarantor hereby unconditionally and irrevocably guarantees to the
         Affiliate, as primary debtor and obligor, the payment of the
         Guaranteed Amount (as defined below) if the Minimum Work Obligation is
         not completed by the earlier of (i) the date of termination of the
         Agreement and (ii) the date that is [ ](2) years following the
         Takeover Date (in either case, the

- -------------
(1)      This Guarantee may be provided in lieu of the letter of credit by
         bidders whose direct or indirect parent companies qualified in
         Category "A" or "B" in the Third Operating Agreement Round.

(2)      Insert the number of years specified in the Final Tender Protocol for
         the completion of the Minimum Work Obligation.
<PAGE>   133


         "Completion Date"). The "Guaranteed Amount" shall initially be equal
         to U.S.$ _______.(3) The Guaranteed Amount shall be reduced no
         earlier than three months after the date of this Guarantee, and no
         more frequently than every three months thereafter, by the amount
         specified in a certificate duly executed by the Affiliate in the form
         attached hereto as Exhibit 1. The Guaranteed Amount shall be reduced
         to zero upon the execution by the Affiliate of a Certificate in the
         form attached hereto as Exhibit 2.
         
4.       In the event that the Minimum Work Obligation is not completed by the
         Completion Date, no later than three Business Days after written
         demand by the Affiliate, the Guarantor shall pay the Guaranteed Amount
         as of the Completion Date, in U.S. dollars, by wire transfer of
         immediately available funds to the account specified by the Affiliate.
         In the event that the Guarantor disputes any such demand, the
         Guarantor shall nonetheless pay the amount demanded, and, in the event
         that the dispute is resolved in the Guarantor's favor, the Affiliate
         shall repay the excess amount paid by the Guarantor, together with
         interest at a reasonable rate to be determined by mutual agreement by
         the Affiliate and the Guarantor or, if such agreement is not reached
         by the time an arbitral tribunal appointed pursuant to Clause 12 of
         this Guarantee makes an award, to be determined by the arbitral
         tribunal.

5.       This Guarantee shall expire and shall be of no further force or effect
         if no demand for payment is made hereunder pursuant to Clause 4 within
         six months following the Completion Date, except that this Guarantee
         shall be reinstated and be in full force and effect if, and to the
         extent that, the Guaranteed Entity makes any payment to the Affiliate
         in respect of an amount guaranteed hereunder and such payment, or any
         portion thereof, is required to be returned to the Guaranteed Entity
         in accordance with any applicable bankruptcy, insolvency or similar
         law.

6.       This Guarantee is irrevocable and unconditional and shall remain in
         full force and effect to the extent of the Guaranteed Amount at any
         given time, notwithstanding (a) any amendment or termination of the
         Agreement, (b) any extension of time or other concession granted by
         the Affiliate, or (c) any delay or failure by the Affiliate in
         pursuing any actions or remedies available against the Guarantor
         hereunder (except as provided in Clause 5) or against the Guaranteed
         Entity for failure to complete the Minimum Work Obligation or
         otherwise.

7.       The provisions contained in Article 547 of the Commercial Code of
         Venezuela will be fully applicable to this Guarantee. Accordingly, the
         Affiliate shall have no obligation to pursue any remedy or take any
         action against or in respect of the Guaranteed Entity prior to
         enforcing its rights under this Guarantee directly against the
         Guarantor. In addition, the Guarantor may not claim that the Affiliate
         could have avoided or mitigated, in any manner or through any action,


- --------------

(3)      The amount to be included will be equal to the product of the
         Guaranteed Entity's Participation, and the value of the Minimum Work
         Obligation set forth in Section 4.4 of the Agreement. The value of the
         Minimum Work Obligation for each Area is set forth in the Final Tender
         Protocol.


                                       2
<PAGE>   134

         the damages resulting from the Guaranteed Entity's failure to complete
         the Minimum Work Obligation, or resort to any other guarantee held at
         any time in its favor, before proceeding against the Guarantor in
         connection with its obligations under this Guarantee. The Guarantor's
         obligations under this Guarantee shall be independent and absolute,
         and the Guarantor shall have no right of set-off or counterclaim with
         respect to any other claims it may have against the Affiliate or any
         other Person.

8.       All of the obligations of the Guarantor set forth herein shall bind
         the Guarantor and its successors and permitted assigns. The Guarantor
         may not assign or delegate its duties or obligations hereunder without
         the prior written consent of the Affiliate, and any purported
         assignment or delegation without such consent shall be null and void.
         The Guarantor confirms that this Guarantee shall remain in effect with
         respect to any assignee of the Guaranteed Entity under the Agreement
         that is an Associated Entity of the Guaranteed Entity, and upon any
         such assignment the assignee shall be considered the Guaranteed Entity
         for all purposes hereunder to the extent of the assigned obligations.
         The Guarantor additionally confirms that any permitted assignee of all
         of the Affiliate's rights and obligations under Clause 27.3 of the
         Agreement may exercise all rights and remedies of the Affiliate under
         this Guarantee. No other person or entity shall be a beneficiary of
         this Guarantee or have or acquire any rights by reason of this
         Guarantee.

9.       This Guarantee shall be governed by and construed in accordance with
         the laws of the Republic of Venezuela.

10.      Any failure or delay by the Affiliate to exercise any right, in whole
         or in part, hereunder shall not be construed as a waiver of the right
         to exercise the same or any other right.

11.      No amendment or modification of this Guarantee shall be effective
         unless in writing and signed by the Guarantor and the Affiliate.

12.      Any dispute concerning the legal interpretation or construction of
         this Guarantee shall be settled exclusively and finally by
         arbitration. The arbitration shall be conducted in accordance with the
         Rules of the International Chamber of Commerce ("ICC"). The Affiliate
         shall select an arbitrator and the Guarantor shall select an
         arbitrator in accordance with the ICC Rules. The arbitrators so
         nominated shall then agree within 30 days on a third arbitrator to
         serve as Chairman. The arbitration shall be conducted in New York City
         (United States of America). Notwithstanding the foregoing, in the
         event that a dispute involves both the Guarantor and the Guaranteed
         Entity, arbitration shall be conducted in accordance with Clause 23.2
         of the Agreement, as a single proceeding, and the Guarantor and the
         Guaranteed Entity shall jointly have the rights of the Guaranteed
         Entity under such Clause 23.2.

13.      The Guarantor shall pay upon demand and presentation of invoices all
         reasonable and actual costs and expenses (including, without
         limitation, reasonable fees and expenses of counsel) incurred by the
         Affiliate in connection with the successful enforcement of this
         Guarantee.


                                       3
<PAGE>   135

14.      All notices, demands, instructions, waivers or other communications to
         be provided pursuant to this Guarantee, and any consents contemplated
         in this Guarantee, shall be in writing in Spanish or English, shall be
         effective upon receipt, and shall be sent by personal delivery,
         courier, first class mail, facsimile or telex, to the following
         addresses:

         i)  If to the Guarantor, to:

         ii) If to the Affiliate, to:

                 [Affiliate name]
                 [Affiliate address]

         The addresses and telex and facsimile numbers for notices given
         pursuant to this Guarantee may be changed by means of a written notice
         given by the Affiliate or the Guarantor, as applicable, to the other
         at least 15 Business Days prior to the effective date of such change.

15.      This Guarantee is being executed in both the Spanish language and the
         English language. The Spanish version shall constitute the binding
         version, and the English version is being executed as a matter of
         reference only.

16.      This Guarantee may be executed in any number of counterparts, each of
         which shall be deemed to be an original.

This Guarantee has been duly executed by the Guarantor and the Affiliate by
their respective officers thereunto duly authorized as of the ___ day of ___,
1997.

                                              [NAME OF GUARANTOR]

                                              By:
                                                 -----------------------------
                                              Name:
                                                   ---------------------------
                                              Title:
                                                    --------------------------
ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By:
   -----------------------------
Name:
     ---------------------------
Title:
      --------------------------


                                       4
<PAGE>   136

                                                                       EXHIBIT 1


              [FORM OF AFFILIATE CERTIFICATE REDUCING GUARANTEED AMOUNT]

        Reference is made to the Guarantee (the "Guarantee"), dated as of _____,
1997, issued by __________, a __________, organized under the laws of _________,
relating to the Operating Agreement (the "Agreement"), dated as of _____, 1997,
among [name of Affiliate] ("the Affiliate") a sociedad anonima organized under
the laws of the Republic of Venezuela, __________, a __________ organized under
the laws of ______, and ________, a ____________ organized under the laws of
_________.  Capitalized terms used herein and not defined have the respective
meanings set forth in the Guarantee or, to the extent not defined therein, in
the Agreement.
                           
        The undersigned, being duly authorized to execute this certificate on
behalf of the Affiliate, hereby certifies that:               

         (i)  The amount in U.S. dollars specified in (a) below is either (1) 
              the share allocable to the Guaranteed Entity of the amount that 
              has been spent by the Contractors on the Minimum Work Obligation
              through the date of this certificate, or (2) a 10% reduction in
              the existing Guaranteed Amount due to Exploracion y Produccion
              EPIC, S.A. becoming a Party to the Agreement; and
        
         (ii) The Guaranteed Amount is to be reduced to the amount specified
              in (b) below, effective upon the execution of this certificate.

(a) Share or Dollar Amount Spent on                $_______________
Minimum Work Obligation or Reduction due
to EPIC

(b) Remaining Guaranteed Amount                    $_______________

      This certificate has been duly executed by the undersigned as of the ___
day of ________ , 199__.

                                        [NAME OF AFFILIATE]

                                        

                                        By:
                                           -------------------------
                                        Name: 
                                        Title:



                                   5
<PAGE>   137



                                                                      EXHIBIT 2

               [FORM OF AFFILIATE CERTIFICATE AS TO COMPLETION]

       Reference is made to the Guarantee (the "Guarantee"), dated as of
__________, 1997, issued by __________, a __________, organized under the laws 
of _________,  relating to the Operating Agreement (the "Agreement"), dated as
of_________, 1997, among [name of Affiliate] ("the Affiliate"), a sociedad
anonima organized under the laws of the Republic of Venezuela, _________, a
___________ organized under the laws of __________, and ____________, a
__________ organized under the laws of __________. Capitalized terms used herein
and not defined have the respective meanings set forth in the Guarantee or, to
the extent not defined therein, in the Agreement.             

       The undersigned, being duly authorized to execute this certificate on
behalf of the Affiliate, hereby certifies that:                         

         (i)     The Minimum Work Obligation has been completed by the
                 Contractors; and

         (ii)    The Guaranteed Amount is to be reduced to zero, effective upon
                 the execution of this certificate.

                 This certificate has been duly executed by the undersigned as
of the __________ day of 199__.

                                                [NAME OF AFFILIATE]


                                                By:
                                                   -------------------------
                                                Name:
                                                Title:




                                      6
<PAGE>   138

ANNEX M-2


[Translation]

          [FORM OF FINANCIAL UNDERTAKING FOR MINIMUM WORK OBLIGATION]

         Reference is made to the Operating Agreement (the "Agreement") of even
date herewith among [name of Affiliate] (together with its successors and
assigns, the "Affiliate"), a sociedad anonima organized under the laws of the
Republic of Venezuela, __________ (the "Undertaking Contractor"), a __________ 
organized under the laws of __________, and __________, a __________ organized
under the laws of __________.

         With respect to the obligations assumed by the Undertaking Contractor
under the Agreement, the Undertaking Contractor hereby agrees as follows: 

1.  Capitalized terms used herein and not otherwise defined shall have the
    meanings set forth in the Agreement.

2.  The Undertaking Contractor hereby unconditionally and irrevocably 
    undertakes the payment of the Face Amount (as defined below) to the
    Affiliate if the Minimum Work Obligation is not completed by the earlier of
    (i) the date of termination of the Agreement and (ii) the date that is
    [ ](2) years following the Takeover Date (in either case, the "Completion
    Date"). The "Face Amount" shall initially be equal to U.S. $_______(3). The
    Face Amount shall be reduced no earlier than three months after the date of
    this Financial Undertaking, and no more frequently than every three months
    thereafter, by the amount specified in a certificate duly executed by the
    Affiliate in the form attached hereto as Exhibit 1. The Face Amount shall be
    reduced to zero upon the execution by the Affiliate of a Certificate in the
    form attached hereto as Exhibit 2.


- ------------------

(1) This Financial Undertaking may be provided in lieu of the letter of credit
    by pre-qualified companies who qualified financially under Categories "A" or
    "B" in the Third Operating Agreement Round and who will be signing the
    Operating Agreement directly (and not through an Associated Entity or
    Jointly Held Company).

(2) Insert period for completion of the Minimum Work Obligation from the Final 
    Tender Protocol.  

(3) The amount to be included will be equal to the product of the Undertaking
    Contractor's Participation, and the value of the Minimum Work Obligation set
    forth in Section 4.4 of the Agreement. The value of the Minimum Work
    Obligation for each Area is set forth in the Final Tender Protocol.
<PAGE>   139


3.       In the event that the Minimum Work Obligation is not completed by the
         Completion Date, no later than three Business Days after written demand
         by the Affiliate, the Undertaking Contractor shall pay the Face Amount
         as of the Completion Date, in U.S. dollars, by wire transfer of
         immediately available funds to the account specified by the Affiliate.
         In the event that the Undertaking Contractor disputes any such demand,
         it shall nonetheless pay the amount demanded, and, in the event that
         the dispute is resolved in the Undertaking Contractor's favor, the
         Affiliate shall repay the excess amount paid by the Undertaking
         Contractor, together with interest at a reasonable rate to be
         determined by mutual agreement by the Affiliate and the Undertaking
         Contractor or, if such agreement is not reached by the time an arbitral
         tribunal appointed pursuant to Clause 11 of this Financial Undertaking
         makes an award, to be determined by the arbitral tribunal.

4.       This Financial Undertaking shall expire and shall be of no further
         force or effect if no demand for payment is made hereunder pursuant to
         Clause 3 within six months following the Completion Date.

5.       The Financial Undertaking is irrevocable and unconditional and shall
         remain in full force and effect to the extent of the Face Amount at any
         given time, notwithstanding (a) any amendment or termination of the
         Agreement, (b) any extension of time or other concession granted by the
         Affiliate, or (c) any delay or failure by the Affiliate in pursuing any
         actions or remedies available against the Undertaking Contractor
         hereunder (except as provided in Clause 4) or under the Agreement for
         failure to complete the Minimum Work Obligation or otherwise.

6.       The Undertaking Contractor may not claim that the Affiliate could have
         avoided or mitigated, in any manner or through any action, the damages
         resulting from the Undertaking Contractor's failure to complete the
         Minimum Work Obligation, or resort to any guarantee held at any time in
         its favor, before proceeding against the Undertaking Contractor in
         connection with its obligations under this Financial Undertaking. The
         Undertaking Contractor's obligations under this Financial Undertaking
         shall be independent and absolute, and the Undertaking Contractor shall
         have no right of set-off or counterclaim with respect to any other
         claims it may have against the Affiliate or any other Person.

7.       All of the obligations of the Undertaking Contractor set forth herein
         shall bind the Undertaking Contractor and its successors and permitted
         assigns. The Undertaking Contractor may not assign or delegate its
         duties or obligations hereunder without the prior written consent of
         the Affiliate, and any purported assignment or delegation without such
         consent shall be null and void. The Undertaking Contractor agrees that
         in the event of any assignment under the Agreement to an Associated
         Entity of the Undertaking Contractor, it shall replace this Financial
         Undertaking with a guarantee in the form of Annex M-1 to the
         Agreement. The Undertaking Contractor additionally confirms that any
         permitted assignee of all of the Affiliate's rights and obligations
         under Clause 27.3 of the Agreement may exercise all rights and remedies
         of the Affiliate under this Financial Undertaking. No other person or
         entity shall be a beneficiary of this Financial Undertaking or have or
         acquire any rights by reason of this Financial Undertaking.

                                           2
<PAGE>   140

8.       The Financial Undertaking shall be governed by and construed in
         accordance with the laws of the Republic of Venezuela.

9.       Any failure or delay by the Affiliate to exercise any right, in whole
         or in part, hereunder shall not be construed as a waiver of the right
         to exercise the same or any other right.

10.      No amendment or modification of this Financial Undertaking shall be
         effective unless in writing and signed by the Undertaking Contractor
         and the Affiliate.

11.      Any dispute concerning the legal interpretation or construction of this
         Financial Undertaking shall be settled exclusively and finally by
         arbitration. The arbitration shall be conducted in accordance with the
         ICC Rules. The Affiliate shall select an arbitrator and the Undertaking
         Contractor shall select an arbitrator in accordance with the ICC Rules.
         The arbitrators so nominated shall then agree within 30 days on a third
         arbitrator to serve as Chairman. The arbitration shall be conducted in
         New York City (United States of America).

12.      The Undertaking Contractor shall pay upon demand and presentation of
         invoices all reasonable and actual costs and expenses (including,
         without limitation, reasonable fees and expenses of counsel) incurred
         by the Affiliate in connection with the successful enforcement of this
         Financial Undertaking.

13.      All notices, demands, instructions, waivers or other communications to
         be provided pursuant to this Financial Undertaking, and any consents
         contemplated in this Financial Undertaking, shall be in writing in
         Spanish or English, shall be effective upon receipt, and shall be sent
         by personal delivery, courier, first class mail, facsimile or telex, to
         the following addresses:             

         i)  If to the Undertaking Contractor, to:

         ii) If to the Affiliate, to:

                 [Affiliate name]
                 [Affiliate address]

         The addresses and telex and facsimile numbers for notices given
         pursuant to this Financial Undertaking may be changed by means of a
         written notice given by the Affiliate or the Undertaking Contractor,
         as applicable, to the other at least 15 Business Days prior to the
         effective date of such change.

14.      This Financial Undertaking is being executed in both the Spanish
         language and the English language. The Spanish version shall constitute
         the binding version, and the English version is being executed as a
         matter of reference only.                                

15.      This Financial Undertaking may be executed in any number of
         counterparts, each of which shall be deemed to be an original. 


                                           3

<PAGE>   141

This Financial Undertaking has been duly executed by the Undertaking
Contractor and the Affiliate by their respective officers thereunto
duly authorized as of the ___ day __________________,of 1997.

                                         [NAME OF UNDERTAKING CONTRACTOR]

                                         By: 
                                            --------------------------
                                         Name: 
                                              ------------------------
                                         Title:
                                               -----------------------


ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By: 
   --------------------------
Name: 
     ------------------------
Title:
      -----------------------



                                           4
<PAGE>   142

                                                                       EXHIBIT 1

            [FORM OF AFFILIATE CERTIFICATE REDUCING FACE AMOUNT]

         Reference is made to the Financial Undertaking (the "Financial
Undertaking"), dated as of ________________, 1997, issued by _______________,
a ______________, organized under the laws of ________________, relating to the
Operating Agreement (the "Agreement"), dated as of __________________, 1997,
among [name of Affiliate] ("the Affiliate"), a sociedad anonima organized under
the laws of the Republic of Venezuela, __________________, a __________________ 
organized under the laws of ___________________, and ___________________, a
________________ organized under the laws of ________________. Capitalized terms
used herein and not defined have the respective meanings set forth in the
Financial Undertaking or, to the extent not defined therein, in the Agreement.

         The undersigned, being duly authorized to execute this certificate on
behalf of the Affiliate, hereby certifies that:

         (i)     The amount in U.S. dollars specified in (a) below is either
                 (1) the share allocable to the Undertaking Contractor of the
                 amount that has been spent by the Contractors on the Minimum
                 Work Obligation through the date of this certificate, or (2) a
                 10% reduction in the existing Face Amount due to Exploracion
                 y Produccion EPIC, S.A. becoming a Party to the Agreement; and

         (ii)    The Face Amount is to be reduced to the amount specified in
                 (b) below, effective upon the execution of this certificate.

(a) Share of Dollar Amount Spent on             $ _______________
Minimum Work Obligation or Reduction due
to EPIC

(b) Remaining Face Amount                       $ _______________

                 This certificate has been duly executed by the undersigned as
of the ___ day of _______________ 199__.


                                        [NAME OF AFFILIATE]

         
                                         By: 
                                            --------------------------
                                         Name: 
                                         Title:
                        
         
         
                                      5
<PAGE>   143

                                                                       EXHIBIT 2

              [FORM OF AFFILIATE CERTIFICATE AS TO COMPLETION]

             Reference is made to the Financial Undertaking (the "Financial
Undertaking"), dated as of _________________, 1997, issued by ________________
a __________________, organized under the laws of _______________, relating to
the Operating Agreement (the "Agreement"), dated as of __________________, 1997,
among [name of Affiliate] ("the Affiliate"), a sociedad anonima organized under
the laws of the Republic of Venezuela, _________________, a ________________
organized under the laws of __________________, and ___________________, a 
___________________ organized under the laws of ________________. Capitalized
terms used herein and not defined have the respective meanings set forth in the
Financial Undertaking or, to the extent not defined therein, in the Agreement.
                                                                       
             The undersigned, being duly authorized to execute this certificate 
on behalf of the Affiliate, hereby certifies that:

        (i)     The Minimum Work Obligation has been completed by the
                Contractors; and

        (ii)    The Face Amount is to be reduced to zero, effective upon the
                execution of this certificate.

                This certificate has been duly executed by the undersigned as 
of the ____ day of ______________, 199__.



                                         [NAME OF AFFILIATE]



                                         By: 
                                            --------------------------
                                         Name: 
                                         Title:
         



                                      6
<PAGE>   144

                                    ANNEX N
                                AVAILABLE ASSETS
                                 BOQUERON AREA

         ASSETS TO BE OPERATED BY THE OPERATOR

         1.      BOQ-1 I flow station.

         2.      La Toscana manifold inlet.

                                     N-1

<PAGE>   145

ANNEX 0

[Translation]
  
  
            [FORM OF LETTER OF CREDIT FOR MINIMUM WORK OBLIGATION)

                    IRREVOCABLE STAND-BY LETTER OF CREDIT

                           Issued by [Name of Bank]


Date:___________
No.:____________


[Name of Affiliate]
[Affiliate Address)


Dear Sirs:

         1. [Name of Bank], a __________ organized under the laws of _________
(the "Issuer"), hereby establishes in favor of (name of Affiliate] (the
"Affiliate"), a sociedad anonima organized under the laws of the Republic of
Venezuela, its Irrevocable Standby Letter of Credit No. ______________ (this
"Letter of Credit"), whereby the Issuer authorizes the Affiliate to draw
hereunder, in a single drawing, the Face Amount of this Letter of Credit as of
the date of drawing (determined in the manner set forth in Clause 3 of this
Letter of Credit) by presentation of a Draft and a Drawing Certificate (each as
defined below) at the Issuer's office specified in Clause 5 of this Letter of
Credit, during the Drawing Period (as defined below).

         2. This Letter of Credit is being established in accordance with the
Operating Agreement (the "Agreement "), dated ______, 1997, between the
Affiliate, [Contractor #1], a ____________ organized under the laws of
__________, and [Contractor #2], a _____________ organized under the laws of
__________.(1) Capitalized terms used herein (including in the Exhibits hereto)
and not defined have the respective meanings set forth in the Agreement.

         3. The Face Amount of this Letter of Credit shall initially be U.S.
$__________. The Face Amount shall be reduced upon presentation by the Affiliate
to the Issuer of a certificate                                            

- ---------------

(1)  Add or delete spaces as appropriate to reflect the number of Contractors.


<PAGE>   146


(a "Reduction Certificate"), in the form set forth in Exhibit 1 hereto,
specifying a new, lower Face Amount. A Reduction Certificate may be presented to
the Issuer, and the Face Amount may be reduced, no more frequently than once
every three months, beginning three months after the date of this Letter of
Credit.

         4. The Face Amount of this Letter of Credit may be drawn by the
Affiliate in the manner specified in Clause 5 of this Letter of Credit on any
Banking Day during the period (the "Drawing Period") beginning at 9:00 a.m., New
York City time, on __________, 19 ____,(2) and ending at 5:00 p.m., New York 
City time, on __________, ____.(3) A "Banking Day" is any day other than a
Saturday, a Sunday or day on which commercial banks in New York City are
authorized or required by law, regulation or executive order to close.   

         5. A drawing may be made hereunder only by the presentation by the
Affiliate to the Issuer of a sight draft of the Affiliate drawn on the Issuer in
the form attached hereto as Exhibit 2 (a "Draft"), and a certificate executed by
the Affiliate in the form attached hereto as Exhibit 3 (a "Drawing
Certificate"). Presentation of a Draft and Drawing Certificate must be made at
the Issuer's office in New York City located at __________, or at such other
address in New York City as the Issuer may designate to the Affiliate by notice
given in accordance with Clause 10 of this Letter of Credit.          

         6. Upon the presentation by the Affiliate to the Issuer during the
Drawing Period of the Draft and Drawing Certificate at the office of the Issuer
designated pursuant to such Clause 5, the Issuer shall pay the Face Amount as of
the date of presentation, by wire transfer of immediately available funds to the
Affiliate's account with a financial institution in New York City designated in
the Drawing Certificate. If presentation is duly made at or prior to 11:00 a.m.,
New York City time, on any Banking Day, payment shall be made by the Issuer at
or prior to 5:00 p.m., New York City time, on the same Banking Day. If
presentation is duly made after 11:00 a.m., New York City time, on any Banking
Day, payment shall be made by the Issuer at or prior to 1:00 p.m., New York City
time, on the immediately following Banking Day.

         7. This Letter of Credit shall expire upon the earliest of (i)
_______,(4) (ii) the reduction of the Face Amount of this Letter of Credit to
zero, (iii) the date on which the Affiliate presents to the Issuer a certificate
executed by the Affiliate in the form attached hereto as Exhibit 4 (a
"Completion Certificate"), and (iv) the indefeasible payment by the Issuer to
the Affiliate in the manner set forth in Clause 6 of this Letter of Credit of
the Face Amount upon a drawing properly made hereunder.  Notwithstanding the
foregoing, any drawing properly made

- --------------


(2)  Insert the date of the Effective Date.

(3)  Insert the date that is six months after the last day of the period set 
     forth in Clause 4.3 of the Agreement.  

(4)  Insert the date of the expiration of the Drawing Period.

                                      2
<PAGE>   147
hereunder prior to the expiration of this Letter of Credit shall be honored by
the Issuer. Notwithstanding anything contained in Article 17 of the Uniform
Customs (defined below) or herein, in the event that the Issuer's office
designated in Clause 5 of this Letter of Credit is closed on the date set forth
in (i) of this Clause 7, the expiration date of this Letter of Credit and the
Drawing Period shall be extended to the next Banking Day on which such office is
open.

         8. This Letter of Credit may only be drawn by, and other rights
hereunder may only be exercised by, the Affiliate, unless and until the Issuer
receives a certificate in the form attached hereto as Exhibit 5 (a "Transfer
Certificate") from the Affiliate designating a Person that is an assignee of
the rights and obligations of the Affiliate under Clause 27.3 of the Agreement.
Upon the delivery of a Transfer Certificate by the Affiliate to the Issuer, the
assignee named in the Transfer Certificate (and only such assignee) shall be
considered "the Affiliate" for all purposes hereunder (including for purposes of
this Clause 8). This Letter of Credit is a "transferable credit" within the
meaning of Article 48(a) of the Uniform Customs, and may be transferred in
accordance with this Clause 8, notwithstanding anything to the contrary
contained in Article 48(g) of the Uniform Customs.                       

         9. This Letter of Credit is subject to the Uniform Customs and Practice
for Documentary Credits (1993 Revision), International Chamber of Commerce
Publication No. 500 (the "Uniform Customs"). As to matters not covered by the
Uniform Customs, this Letter of Credit shall be governed by, and construed in
accordance with, the laws of the State of New York, including without limitation
Article 5 of the Uniform Commercial Code as in effect in the State of New York.
                                                                        
         10. All notices, demands, instructions, waivers or other communications
to be provided pursuant to this Letter of Credit shall be in writing in English,
shall be effective upon receipt, and shall be sent by personal delivery,
courier, first class mail, facsimile or telex, to the following addresses: 

         i)  If to the Issuer, to:


                                      3

<PAGE>   148

         ii) If to the Affiliate, to:

                         [Affiliate name] 
                         [Affiliate address]

The addresses and telex and facsimile numbers for notices given pursuant to this
Letter of Credit may be changed by the Issuer or the Affiliate by means of a
written notice given to the other at least 15 Banking Days prior to the
effective date of such change.

         11. This Letter of Credit sets forth in full the Issuer's undertaking,
and such undertaking shall not in any way be modified or amended by reference to
any document, instrument or agreement referred to herein, except the Draft, the
Drawing Certificate, any Transfer Certificate, any Completion Certificate and
any Reduction Certificate.                                                    

                                         Very truly yours,

                                         [NAME OF BANK]

                                         By:
                                            ----------------------------
                                         Name:
                                         Title:



                                      4
<PAGE>   149
                                                                       EXHIBIT 1


                        (FORM OF REDUCTION CERTIFICATE)

                          Reference is made to the Irrevocable Standby Letter of
Credit (the "Letter of Credit"), No.             dated            , issued by
             in favor of the Affiliate. Capitalized terms used herein and not 
defined have the respective meanings set forth or incorporated by reference in 
the Letter of Credit.

                 The undersigned, being duly authorized to execute this
certificate on behalf of the Affiliate, hereby certifies that:

         (i)     The amount in U.S. dollars specified in (a) below is either
                 (1) the share allocable to the Face Amount of the Letter of
                 Credit of the amount that has been spent by the Contractors on
                 the Minimum Work Obligation through the date of this
                 certificate, or (2) a 10% reduction in the existing Face
                 Amount of the Letter of Credit due to Exploracion y Produccion
                 EPIC, S.A. becoming a Party to the Agreement; and

         (ii)    The Face Amount of the Letter of Credit is to be reduced to an
                 amount equal to the Remaining Face Agreement specified in (b)
                 below, effective as of the date of this certificate set forth
                 below.

(a) Share of Dollar Amount Spent on                $_______________
Minimum Work Obligation or Reduction
due to EPIC

(b) Remaining Face Amount                          $________________

         This certificate has been duly executed by the undersigned as of the
__________ day of________, 199_.

                                        [NAME OF AFFILIATE]

                                        By:
                                           ------------------------
                                        Name: 
                                        Title:


                                       5
<PAGE>   150

                                                                       EXHIBIT 2

                                [FORM OF DRAFT]

                          Letter of Credit No._______
                              [New York, New York]
                                [Date of Draft]

At sight

PAY TO THE ORDER OF [NAME OF Affiliate](1) the sum of U.S. $__________
(_______________ U.S. Dollars), FOR VALUE RECEIVED. DRAWN UNDER [NAME
OF ISSUER] IRREVOCABLE STANDBY LETTER OF CREDIT NO.                 .

                                        [NAME OF AFFILIATE](1)

                                        By:
                                           --------------------------- 
                                        Name:
                                        Title:

To: [Name of Issuer].
    [Address of Issuer]



- ----------------

(1) If the Letter of Credit is assigned pursuant to Clause 8 of the Letter of
Credit, substitute the name of the assignee.
<PAGE>   151

                                                                       EXHIBIT 3



                         [FORM OF DRAWING CERTIFICATE]

                Reference is made to the Irrevocable Standby Letter of Credit
(the "Letter of Credit"), No. ____________ dated _____________, issued by
________ in favor of [name of Affiliate]. Capitalized terms used herein and not
defined have the respective meanings set forth or incorporated by reference in
the Letter of Credit.

                 The undersigned, being duly authorized to execute this
certificate on behalf of the Affiliate, hereby certifies that:

         (i)     the Agreement has terminated without completion of the Minimum
                 Work Obligation;

         (ii)    the period specified for the completion of the Minimum Work
                 Obligation under Clause 4.3 of the Agreement has expired
                 without completion of the Minimum Work Obligation; or

         (iii)   the Minimum Work Obligation has not been completed by the
                 Contractors as of 15 days prior to [date](5) (the "Renewal
                 Date") and the Letter of Credit has not been either:

                 (a) amended to extend the last day of the Drawing Period to 
                 the last day of the period specified for the completion of the
                 Minimum Work Obligation in the first sentence of Clause 4.3 of
                 the Agreement (or, if such date is not known, a date at least 
                 two years following the Renewal Date); or

                 (b) replaced by a new irrevocable stand-by letter of credit 
                 that is (i) issue by [       ](6) or another bank or financial
                 institution having a branch in New York City, the long-term 
                 unsecured senior debt obligations of which are rated at least 
                 "A" by Standard & Poor's Ratings Group or by Moody's Investors
                 Services, Inc., (ii) payable at a branch of such bank or 
                 financial institution in New York City, (iii) in the form of 
                 the Letter of Credit (except for relevant dates), (iv) 
                 provides for a Drawing Period that ends on the last day of the
                 period specified for the completion of the Minimum Work
                 Obligation in the first sentence of Clause 4.3 of the
                 Agreement (or, if such date is not known, a date at least two
                 years following the Renewal Date), and (v) in an amount equal
                 to the Face Amount of the Letter of Credit as of the Renewal
                 Date.

- ---------------

(5)Insert the last day of the Drawing Period set forth in Clause 4 of the
   Letter of Credit.

(6)Insert name of the Issuer of the Letter of Credit.


                                       7
<PAGE>   152
         Payment of the current Face Amount of the Letter of Credit is to be
made by the Issuer to the following account:


                 [insert details for account in New York City]


         This certificate has been duly executed by the undersigned as of the
_____ day of _________ 199__.

                                            [NAME OF AFFILIATE]

                                            By:
                                               ------------------------------
                                            Name:
                                            Title:




                                       8
<PAGE>   153
                                                                       EXHIBIT 4

                        [FORM OF COMPLETION CERTIFICATE]

        Reference is made to the Irrevocable Standby Letter of Credit (the
"Letter of Credit") No. ________, dated ________, issued by in favor of [name of
Affiliate]. Capitalized terms used herein and not defined have the respective
meanings set forth or incorporated by reference in the Letter of Credit.

        The undersigned, being duly authorized to execute this certificate on 
behalf of the Affiliate, hereby certifies that:

         (i)     The Minimum Work Obligation has been completed by the
                 Contractors or the Letter of Credit has been replaced by an
                 irrevocable stand-by letter of credit as described in
                 paragraph (iii) (b) of the Drawing Certificate; and

         (ii)    The Letter of Credit shall expire as of the date of this
                 Certificate.

                 This certificate has been duly executed by the undersigned as
of the day of________ 199__.

                                        [NAME OF AFFILIATE]

                                        By:
                                           -------------------------- 
                                        Name:
                                        Title:



                                       9
<PAGE>   154
                                                                       EXHIBIT 5

                         [FORM OF TRANSFER CERTIFICATE]


         Reference is made to the Irrevocable Standby Letter of Credit (the
"Letter of Credit"), No. _________, dated ________, issued by ____________ in
favor of [name of Affiliate]. Capitalized terms used herein and not defined have
the respective meanings set forth or incorporated by reference in the Letter of
Credit.

        The undersigned, being duly authorized to execute this certificate on 
behalf of the Affiliate, hereby certifies that:

             (i)      The Affiliate has transferred its rights and
                      obligations under the Agreement to __________ (the
                      "Transferee"), a ________ organized under the laws of
                      __________; and
         
             (ii)     The Affiliate has transferred all of its rights
                      (including without limitation the rights described in
                      Article 48(d) of the Uniform Customs) under the
                      Letter of Credit to the Transferee.

        All notices, demands, instructions, waivers or other communications to
be provided to the Transferee pursuant to Clause 10 of the Letter of Credit
shall be sent to the following address:

                           [insert notice address]

        This certificate has been duly executed by the undersigned as of the
________ day of_______, 199__.

                                             [NAME OF AFFILIATE]

                                             By:    
                                                ----------------------     
                                             Name:
                                             Title:

                                       10

<PAGE>   155






                                    [MAP]
<PAGE>   156





                                    [MAP]

<PAGE>   1
                          OPERATING SERVICES AGREEMENT

     THIS AGREEMENT has been entered into and signed on the nineteenth (19th)
     day of November, 1993, by and between MARAVEN S.A., hereinafter called "THE
     AFFILIATE," represented herein by its President, Eduardo Lopez Quevedo,
     duly authorized by the Articles of Incorporation - Bylaws of THE AFFILIATE,
     and COMPANIA OCCIDENTAL HIDROCARBUROS, INC., hereinafter called "THE
     CONTRACTOR," a corporation incorporated and existing under the laws of
     California, represented herein by its President, Joseph F. Snape, duly
     authorized by Board Resolutions of THE CONTRACTOR dated November 4, 1993.

     1.   GENERAL PROVISIONS

          1.1  All the Hydrocarbons existing within the territory of Venezuela
               are a national resource owned and controlled by the State.

          1.2  THE AFFILIATE has the exclusive right to carry on exploitation
               operations of the Hydrocarbons in all the area described in
               Appendix "A" and outlined in the Appendix "B", both annexed
               hereto, hereinafter called "Agreement Area."

          1.3  THE AFFILIATE wishes to promote the development of the Agreement
               Area, and THE CONTRACTOR wishes to render services within such
               area.

     LEGEND

     * Confidential portion has been omitted pursuant to a request for
       confidential treatment and filed separately with the Commission.
<PAGE>   2



          1.4  THE CONTRACTOR has the financial capacity, technical ability and
               professional expertise necessary to perform the Operating
               Services described hereunder.

          1.5  THE CONTRACTOR shall perform for THE AFFILIATE, but at the risk
               and cost of THE CONTRACTOR, those rehabilitation, development,
               production and other activities as are required to achieve the
               continuous commercial development of the Hydrocarbons which are
               present in the Agreement Area, as further specifically set forth
               hereunder and in the Work Program approved by THE AFFILIATE.

          It being understood that:

          a)   The compensation of THE CONTRACTOR for the services hereunder 
               shall only consist of such compensation established in Clause 8
               and shall not include any title to the Hydrocarbons found or
               produced in the Agreement Area.

          b)   The rights of THE CONTRACTOR arising from this Agreement do not 
               include any right to the economic benefits resulting from the
               sale or disposal by THE AFFILIATE of the Hydrocarbons extracted
               from the Agreement Area, but only to those economic interests, as
               may be granted hereunder as a contractor, for the operational
               activities thereof.




                                      -2-
<PAGE>   3



          c)   The Agreement is entered into with THE CONTRACTOR by reason of
               its particular conditions, therefore, it is considered to be a
               contract intuito personae. As a result, THE CONTRACTOR may not
               merge, associate or modify either the organizational structure or
               its share participation without notifying THE AFFILIATE in
               writing at least three (3) months in advance to any of the
               above-mentioned situations and must provide THE AFFILIATE with
               any documents required thereby. THE CONTRACTOR will be informed
               by THE AFFILIATE if THE AFFILIATE considers that the occurrence
               of any of the above circumstances is not convenient to its
               interests concerning this Agreement, and if THE CONTRACTOR
               insists in carrying out the decision thereof notwithstanding the
               objection from THE AFFILIATE, THE AFFILIATE may terminate this
               Agreement and THE CONTRACTOR will have no right to file any
               claim.

     2.   DEFINITIONS

          The words and terms as used herein shall have the following meanings,
          irrespective of their being used in the singular or plural:

          2.1  Agreement: Means the Spanish version of this "Operating Services
               Agreement," together with Appendices "A", "B", "C", "D", "E" and
               "F", which are




                                      -3-
<PAGE>   4

               incorporated hereto. The English version of the Agreement and its
               Appendices is used only as a reference and has no effect
               whatsoever.

          2.2  Agreement Area: Means the Area within the territory of Venezuela
               object of this Agreement, as described and outlined in Appendices
               "A" and "B".

          2.3  Agreement Year: Means a period of twelve (12) months starting on
               January 1st and ending the following December 31, according to
               the Gregorian Calendar. For the first year of the Agreement, the
               Agreement Year means the period commencing the Effective Date of
               the Agreement until December 31 of the following Gregorian
               Calendar year.

          2.4  Effective Date: Means the day this Agreement is signed.

          2.5  Associated Company: Means, with respect to a Party to this
               Agreement, a company or other entity controlling or being
               controlled by the Party; or a company controlling a company or
               other entity controlling or being controlled by such Party, it
               being understood that control means the ownership by a company or
               entity of at least fifty percent (50%) of: (a) the voting shares,
               if the company is a stock company; or (b) the controlling rights
               or interests,




                                      -4-

<PAGE>   5

               if the other entity is not a stock company. Those companies or
               entities directly or indirectly controlled by a company or entity
               controlling one of the Parties shall also be considered an
               Associated Company.

          2.6  Starting Date of Operations: Means the date Appendix "F"
               (Operations Starting Certificate) is subscribed by THE CONTRACTOR
               and THE AFFILIATE. The Starting Date of Operations may not be
               later than four (4) months after the Effective Date.

          2.7  Day: Means a calendar day.

          2.8  Force Majeure: Means any event beyond the control of, and which
               is not a direct consequence of gross negligence or willful
               misconduct by the affected Party, including, but not limited to,
               Acts of God or of third parties; compliance with any request,
               ruling, order or decree of governmental authorities,
               substantially impeding the performance of the work as provided
               hereunder; war, rebellion, sabotage or riots; public insurrection
               or disorder; floods or volcanic eruptions, tidal waves,
               earthquakes, lightning, fires, explosions or other disasters;
               strikes or any other act agreed by the workers; or other similar
               occurrences beyond the control of the affected Party and that may
               not be avoided or





                                      -5-
<PAGE>   6



               prevented by such Party exercising due diligence. Nonetheless,
               Force Majeure shall not include occurrences such as:

               a)   Late delivery of construction equipment or materials to be
                    supplied by THE CONTRACTOR, resulting from a congestion at a
                    plant of the manufacturer or any other place; a market
                    oversold condition, inefficiencies or similar occurrences,
                    or

               b)   Late performance by THE CONTRACTOR or its subcontractors
                    resulting from a shortage of supervisors, workforce,
                    inefficiencies or similar events and a shortage of services,
                    or

               c)   The lack of payment of monetary amounts or the congestion
                    or lack of transportation or storage capacity.

               The foregoing, except when said late delivery or late
               performance, described in paragraphs a) and b), or congestion or
               lack of capacity described in paragraph c), arise from Force
               Majeure [an event other than those described in paragraphs a), b)
               and c) above] which is beyond the control of affected Party, as
               well as the subcontractors, and an





                                      -6-
<PAGE>   7

               acceptable alternative source of services, equipment or materials
               is not available.

          2.9  Production: Means the Hydrocarbons produced and regularly
               transferred to THE AFFILIATE at the Transfer Points and under
               the terms indicated in Appendix "A", as it may be modified from
               time to time by written agreement of the Parties ("Appendix
               "A"), on a regular basis, according to the Work Program approved
               by THE AFFILIATE, and that THE AFFILIATE is operationally
               capable of receiving. The reception of Hydrocarbons produced
               under the specifications of Appendix "A" shall only be refused
               in the event of Force Majeure.

          2.10 Audit of Environmental Situation: Means the determination of
               preexisting environmental conditions at the Starting Date of
               Operations.

          2.11 Production Date: Means the date when the Crude Oil Production
               begins, or, subject to Clause 7.7, the Natural Gas, which date,
               for the purposes of this Agreement, coincides with the Starting
               Date of Operations.

          2.12 Crude Oil: Means the oil or any other hydrocarbon in a liquid
               state at environmental conditions, including the liquid
               hydrocarbons extracted from natural gas.




                                      -7-
<PAGE>   8

          2.13 Natural Gas: Means any gaseous hydrocarbon produced, including,
               without limitation, non-associated gas and wet gas, dry gas,
               casinghead gas and residual gas remaining after liquid
               hydrocarbons extraction from wet gas.

          2.14 Hydrocarbons: Means both Crude Oil and Natural Gas.

          2.15 Barrel: Means an amount or volumetric unit of Crude Oil of
               forty-two (42) United States gallons at a temperature of sixty
               degrees (60 degrees) Fahrenheit.

          2.16 Quarter: Means the period of three (3) months starting either on
               January 1, April 1, July 1 or October 1 of any Agreement Year.

          2.17 Current Quarter: Means the pertinent Quarter for purposes of
               invoicing and indexing adjustments as provided in Clause 18
               hereunder.

          2.18 Previous Quarter: Means the Quarter preceding the current
               Quarter.

          2.19 Crude Oil Transfer Points: Means the point of transfer to THE
               AFFILIATE of the risk, safeguard and custody of the Crude Oil
               produced in the Agreement Area, as defined in Appendix "A".




                                      -8-
<PAGE>   9



          2.20 Gas Transfer Points: Means the point of transfer to THE AFFILIATE
               of the risk, safeguard and custody of the Natural Gas produced in
               the Agreement Area, as defined in Appendix "A".

          2.21 Operating Services: Means all drilling, geological studies and
               geophysical surveys, rehabilitation, development, extraction,
               production, treatment, hauling, maintenance and other operations
               authorized or contemplated hereunder.

          2.22 Work Program: Means an annual statement detailing the Operating
               Services to be performed in the Agreement Area, as approved by
               THE AFFILIATE from time to time, including the corresponding
               Budget.

          2.23 Minimum Work Program: Means the statement detailing the minimum
               commitment of Operating Services to be performed at the Agreement
               Area during the first three (3) Agreement Years, including the
               corresponding Budget, as established in Appendix "C".

          2.24 Budget: Means the estimate of all Capital and Non-Capital Costs
               included in the Work Program for the period concerned.




                                      -9-
<PAGE>   10



          2.25 Capital and Non-Capital costs:

               Capital Costs: Means those expenditures incurred for the
               performance of the Operating Services established as such
               according to Clause 18 hereunder, Accounting Procedures, provided
               they are included in the approved Budget as Capital Costs, or
               have been approved in writing by THE AFFILIATE.

               Non-Capital Costs: Means those expenditures incurred for the
               performance of the Operating Services, established as such
               according to Clause 18 hereunder, provided that any such Non-
               Capital Costs have been incurred after the Production Date and
               are included in the approved Budget or have been approved in
               writing by THE AFFILIATE.

          2.26 Norms and Regulations: Any law, regulation and other provisions
               applicable to the activities to be performed by THE CONTRACTOR
               hereunder, including such normal operating practices of THE
               AFFILIATE, as have been notified to THE CONTRACTOR.

          2.27 Party: Means THE CONTRACTOR or THE AFFILIATE, as the case may be.




                                      -10-
<PAGE>   11



          2.28 Applicable Law: Means all the laws of the Republic of Venezuela
               which will rule the interpretation, validity and compliance of
               this Agreement.

       3. DURATION OF AGREEMENT

          3.1  This Agreement shall be in effect for twenty (20) Agreement
               Years, as from the Effective Date. In the event there is no
               Production during the first three (3) Agreement Years, the
               Agreement shall fully automatically cease, except as otherwise
               provided herein.

          3.2  THE CONTRACTOR may request, in writing, the extension of the
               Agreement. Such request must be reasoned and submitted at least
               six (6) months in advance to the maturity of the term set forth
               in paragraph 3.1. THE AFFILIATE may grant or reject, in a
               reasonable manner, the extension, as well as put conditions to
               it.

          3.3  In the event there is no Production at the end of the first three
               (3) Agreement Years, but THE AFFILIATE and THE CONTRACTOR, after
               having considered all the pertinent operating and financial data,
               are of the opinion that Production may be achieved, the period of
               three (3) years described in paragraph 3.1 may be extended as
               agreed upon by the Parties in writing.




                                      -11-
<PAGE>   12



       4. AUTOMATIC TERMINATION

          In the event that Production is interrupted at any moment after the
          first three (3) Agreement Years, for a period of six (6) consecutive
          months, except by reason of Force Majeure, the Agreement shall be
          automatically terminated, unless otherwise agreed upon by THE
          AFFILIATE and THE CONTRACTOR.

       5. WORK PROGRAM AND DISBURSEMENTS

          5.1  During the first thirty-six (36) months of the Agreement counted
               from the Starting Date of Operations, THE CONTRACTOR shall
               perform the Minimum Work Program set forth in Appendix "C".

               The total amount to be spent by THE CONTRACTOR to perform the
               operations during the referred first thirty-six (36) months, as
               provided hereunder, shall not, in the aggregate, be less than the
               amount specified below for each one of the three (3) periods of
               twelve (12) months:

               First twelve (12) months:               U.S.  * 

               Second twelve (12) months:              U.S.  * 

               Third twelve (12) months:               U.S.  *

       * Confidential portion has been omitted pursuant to a request for
         confidential treatment and filed separately with the Commission.





                                      -12-
<PAGE>   13



               To guarantee the Minimum Work Program, THE CONTRACTOR shall
               submit an irrevocable "Stand-By" Letter of Credit, in favor of
               THE AFFILIATE and issued or confirmed by a first-class bank
               previously approved by THE AFFILIATE. The Stand-By Letter of
               Credit must he based on the form established in Appendix "D".

               The amount of the Stand-By Letter of Credit will be reduced at
               the end of each Quarter following the Starting Date of
               Operations, pursuant to its terms. For this purpose, THE
               CONTRACTOR will report to THE AFFILIATE, within fifteen (15) Days
               from the end of each Quarter, the works performed and the amounts
               expended, with supporting documentation, in the performance of
               the Agreement. THE AFFILIATE, after checking the amounts and
               supporting documentation provided by THE CONTRACTOR, will order
               the corresponding bank to reduce the Letter of Credit by the
               amount actually expended, within fifteen (15) Days from receipt
               of said information. At THE AFFILIATE's request, THE CONTRACTOR
               must submit any additional supporting documentation, including,
               without limitation, any pertinent invoice, contract and document.
               THE AFFILIATE shall have the right to object to the amount
               reported by THE CONTRACTOR and the reduction of the Stand-By
               Letter of Credit by the objected amounts will be suspended until
               the objections are duly clarified by the Parties, without



                                      -13-

<PAGE>   14



               prejudice of the reduction by THE AFFILIATE of the amounts not
               objected. Reductions made in accordance with this clause 5.1 will
               not be considered as a waiver by THE AFFILIATE of the right to
               submit an objection or claim in the future or to execute the
               outstanding balance of the Stand-By Letter of Credit with respect
               to works or amounts that further checking demonstrates should not
               have given rise to reduction already made, or of any other right
               that THE AFFILIATE may have with respect to said amounts.

               Default by THE CONTRACTOR of the Minimum Work Program and/or the
               above minimum expenditure commitments as provided herein shall
               give THE AFFILIATE the right, without prejudice to any other
               available right or remedy, to immediately execute the
               above-mentioned Letter of Credit for an amount representing the
               defaulted minimum guaranteed work commitment of THE CONTRACTOR.
               The amounts executed as provided herein shall, in no case, be
               reimbursed to THE CONTRACTOR, nor reduced, offset nor otherwise
               reduced for any reason whatsoever, including, without limitation,
               the receipt of any benefits by THE AFFILIATE, the mitigation of
               whatever damage caused by the default of the Minimum Work Program
               or the real or possible existence of any claim against third
               parties or THE AFFILIATE.




                                      -14-

<PAGE>   15



          5.2  In the event that THE CONTRACTOR is unable to comply with the
               Minimum Work Program, THE AFFILIATE must be immediately informed
               in writing of the reasons causing the non-compliance, and, in
               such event, THE CONTRACTOR may be allowed by THE AFFILIATE to
               perform the defaulted portion of the Minimum Work Program, or
               make the pertinent disbursements during the following year.
               Should such situation arise at the end of the third Agreement
               Year, THE CONTRACTOR shall be able to obtain an extension of the
               "Stand-By" Letter of Credit for the additional term granted to
               finish the performance of the defaulted portion and for the
               amount corresponding to the defaulted commitment of the Minimum
               Work Program. THE AFFILIATE reserves the right to approve or
               refuse the request from THE CONTRACTOR to perform the unfinished
               portion of the Minimum Work Program during the following year,
               within a lapse of time considered to be convenient, without
               having to justify its decision.

               In the event that, during any Agreement Year following the first
               thirty-six (36) months, THE CONTRACTOR shall have performed less
               than the agreed Work Program, such unfinished portion, with due
               justification and with the written consent from THE AFFILIATE,
               may be carried forward to the Work Program for the following
               Agreement Year without affecting the rights of THE CONTRACTOR
               hereunder. Likewise,




                                      -15-
<PAGE>   16



               should THE CONTRACTOR, with prior authorization by THE AFFILIATE,
               carry out more of the Work Program agreed on, said additional
               portion shall be deducted, with due justification and with the
               written consent of THE AFFILIATE, from the Work Program for the
               following Year of the Agreement, without affecting the rights of
               THE CONTRACTOR under this Agreement.

          5.3  At lease three (3) months in advance to the beginning of each
               Agreement Year, or as otherwise agreed upon by the Parties, THE
               CONTRACTOR shall prepare and submit for approval by THE AFFILIATE
               a Work Program for the Agreement Area, setting forth the proposed
               Operating Services to be carried out by THE CONTRACTOR during the
               following Agreement Year, the estimated cost thereof, the
               estimated production to be obtained and the estimated
               Hydrocarbons reserves. The Parties hereby agree that the Work
               Program for the first Agreement Year shall be prepared and
               submitted for THE AFFILIATE's approval within seventy-five (75)
               Days following the Effective Date, except as otherwise agreed by
               the Parties. THE AFFILIATE may grant or reject, for reasonable
               cause, the aforementioned approval of the Work Program, within
               the term established in Clause 5.4.

          5.4  In the event THE AFFILIATE shall wish to propose a revision of
               specific aspects of a Work Program, THE




                                      -16-

<PAGE>   17

               CONTRACTOR shall be notified thereby during the forty-five (45)
               Days following the reception of the Work Program, specifying in
               detail the reasons for such modification. As soon as possible,
               the Parties shall meet in order to reach an agreement over the
               revisions proposed by THE AFFILIATE. However, any portion of the
               Work Program which THE AFFILIATE does not propose to revise
               shall be performed as established in the Work Program. In the
               event no revision is requested by THE AFFILIATE during the
               mentioned period of forty-five (45) Days, the Work Program shall
               be deemed approved as submitted by THE CONTRACTOR. 

          5.5  It is understood that the details of a Work Program may require
               changes in view of the prevailing circumstances, and nothing
               herein shall limit the right of THE CONTRACTOR to perform such
               changes, provided that the general scope of the Work Program is
               not modified by such changes and that they are approved in
               writing by THE AFFILIATE.

          5.6  In the event of emergencies or other special circumstances
               requiring immediate action, including, among others, fires,
               explosions, blow-outs and oil spills, leaks of toxic and/or
               dangerous substances (such as gas, chlorine and ammonia), THE
               AFFILIATE must be immediately informed by THE CONTRACTOR, who



                                      -17-
<PAGE>   18



               must take the appropriate actions to control the situation or
               protect the facilities, people and property. Such actions must be
               timely notified to THE AFFILIATE, for purposes of pertinent
               coordination.

               Any justified expense incurred by THE CONTRACTOR in relation with
               such actions, without prejudice to the provisions of Clause 10.17
               hereof, shall be included in the Capital Costs.

               To meet the situations described above, THE CONTRACTOR must
               submit to THE AFFILIATE, within the sixty (60) days following the
               Effective Date, the emergency and contingency plans to attend to
               any Crude Oil spills.

               Notwithstanding the foregoing, and without prejudice to the
               obligations of THE CONTRACTOR hereunder, should THE AFFILIATE not
               be satisfied with the actions taken by THE CONTRACTOR, or should
               he consider it convenient to the interests thereof, THE AFFILIATE
               may inform THE CONTRACTOR of a direct intervention and may take
               any such action as may be considered advisable, and, in such
               event, any expenses incurred by THE AFFILIATE to that purpose
               shall be reimbursed by THE CONTRACTOR within the thirty (30) days
               following the receipt of the




                                      -18-
<PAGE>   19

               corresponding invoice and, without prejudice to the provisions of
               Clause 10.17 herein, shall be included within the Capital Costs
               of THE CONTRACTOR.

          5.7  Nothing in Clause 5 hereof shall be interpreted as allowing THE
               CONTRACTOR to make disbursements for less than the minimum
               amounts guaranteed, or to perform less than the Minimum Work
               Program, as provided in Clause 5.1 hereof (and as detailed in the
               Minimum Work Program in Appendix "C"), during the first
               thirty-six (36) months of this Agreement, unless a revision to
               that purpose is specifically approved in writing by THE
               AFFILIATE.

          5.8  Without prejudice to the provisions of Clause 5.7, unless it is
               specifically otherwise allowed or justified hereunder, the lack
               of performance of twenty percent (20%) or more of the Work
               Program for any Agreement Year during the term thereof shall be
               considered a material breach of the obligations of THE CONTRACTOR
               hereunder and shall entitle THE AFFILIATE to immediately
               terminate this Agreement without prejudice to any other right or
               remedy available to THE AFFILIATE, including, but not limited to,
               the right to execute the guarantees given by THE CONTRACTOR.





                                      -19-
<PAGE>   20

       6. RIGHTS AND OBLIGATIONS OF THE CONTRACTOR

          Other than the provisions hereunder, THE CONTRACTOR shall:

          6.1  At its sole expense, finance all the Operating Services without
               recourse to THE AFFILIATE, except as otherwise specifically
               provided in Clause 8 hereof.

          6.2  Prepare and implement the annual Work Program in accordance with
               the Norms and Regulations and any other applicable guideline or
               instruction and the oil industry practices, including any such
               regulations concerning safety, health, labor and environmental
               matters applied to the Venezuelan oil industry which are notified
               to THE CONTRACTOR. To such purpose, THE CONTRACTOR shall submit
               to THE AFFILIATE for approval, sixty (60) Days after the
               Effective Date, the following documents: 

               a)   The Program for preventing injuries and/or industrial
                    diseases.

               b)   The Plan for protecting the environment, specifying the 
                    steps to be taken for handling atmospheric emissions, solid
                    residues, toxic waste, or other polluting agents and for
                    preventing pollution of soil and effluents.




                                      -20-
<PAGE>   21

               c)   Contingency plan as indicated in Clause 5.6.

               d)   Emergency plan as indicated in Clause 5.6.

          6.3  Unless as otherwise agreed upon by THE AFFILIATE, THE CONTRACTOR
               shall be responsible, during the term of this Agreement, for the
               maintenance, subject to normal wear and tear, of the facilities
               that it has put into service; and, at the appropriate time, but
               not later than the termination of this Agreement, for the
               abandonment of wells and for the cleaning and dismantlement of
               facilities that it has put into service. Such maintenance,
               abandonment, cleaning and dismantlement will be performed in
               accordance with Norms and Regulations.

          6.4  Perform, together with THE AFFILIATE, an Audit of Environmental
               Situation, in the Agreement Area, within a period not exceeding
               four (4) months from the Effective Date. 

               The cost of the audit shall be paid by the Parties in equal
               parts. Such audit shall be performed by a juridical person
               designated by mutual agreement between the Parties, in writing
               and in accordance with the Venezuelan legislation governing the
               matter. This expenditure will be a Non-Capital Cost for THE
               CONTRACTOR.




                                      -21-
<PAGE>   22



               THE CONTRACTOR shall not be liable for the preexisting
               environmental conditions. In the event the Ministry of the
               Environment and Renewable Natural Resources and/or the Ministry
               of Energy and Mines were to order the correction or recovery of
               the environment in the Agreement Area because of preexisting
               conditions, the execution of such activities will correspond to
               THE AFFILIATE.

               Prior to the Starting Date of Operations, THE CONTRACTOR shall
               perform an Environmental Impact Study as provided in the
               Environmental Organic Law, and the cost thereof shall be included
               as a Capital Cost in accordance with Clauses 18.5 and 18.11.

          6.5  Submit on time to THE AFFILIATE copies of all the geological,
               geophysical, drilling, well, production and any such data and
               reports as THE CONTRACTOR may obtain and compile during the term
               hereof and from time to time. THE CONTRACTOR shall provide on a
               routine and timely basis any such reports as are necessary for
               THE AFFILIATE to comply with the statutory and internal reporting
               requirements thereof, according to the formats provided by THE
               AFFILIATE, including, but not limited to, reports of the
               estimated Hydrocarbons remaining reserves and the Production at
               year end.




                                      -22-
<PAGE>   23



          6.6  Cooperate with and support THE AFFILIATE in obtaining any such
               third parties' permits and/or right of ways and/or servitude as
               are necessary for THE CONTRACTOR to reach or move inside the
               Agreement Area in order to perform the Operating Services
               provided hereunder. In order to obtain such permits, THE
               AFFILIATE shall be notified by THE CONTRACTOR, in writing, at
               least two (2) months in advance, of the precise indication of the
               zones affected by the Operating Services within the Agreement
               Area, as provided in the Work Program. At the end of each
               calendar month, an invoice shall be presented by THE AFFILIATE to
               THE CONTRACTOR expressing:

               a)   any payment made by THE AFFILIATE concerning such permits
                    and rights, in accordance with the rates THE AFFILIATE has
                    to such purpose, together with the corresponding supporting
                    vouchers.

               b)   administration, organization and men-hours expenditures and
                    costs incurred by THE AFFILIATE to obtain such permits and
                    rights.

               Such amounts shall be reimbursed to THE AFFILIATE by THE
               CONTRACTOR within the forty-five (45) Days following the
               presentation thereof and shall be charged to the Capital Costs of
               THE CONTRACTOR.




                                      -23-
<PAGE>   24

          6.7  Give preference to goods and services produced in Venezuela or
               rendered by Venezuelans, provided they are offered under similar
               quality, price and availability conditions, when and in the
               amounts required.

          6.8  Pay any such taxes, contributions and duties as are required by
               the Venezuelan Laws and Ordinances. THE CONTRACTOR shall comply
               with the requirements of the law, specifically those concerning
               the filing of returns, determination and withholding of taxes,
               and maintenance and exhibition of books and records.

          6.9  Promptly respond to and pay the amounts owed, according to
               Clause 10 hereunder, and obtain and keep any such insurance
               policies as are required by said Clause 10.

          6.10 Subject to the terms and provisions hereunder, it shall:

               a)   perform any such activities as are reasonably required to
                    accomplish the purpose of this Agreement, according to
                    Clause 1.5 and as detailed in the Work Program.

               b)   custody and maintain any Hydrocarbons produced in the
                    Agreement Area up to the corresponding




                                      -24-
<PAGE>   25

                    Transfer Points, as well as any other property, plant and
                    equipment of THE AFFILIATE inside or outside the Agreement
                    Area, which is under THE CONTRACTOR's guard and custody for
                    the performance of the Operating Services, in a good and
                    orderly condition, subject to normal wear and tear.

          6.11 Promptly after termination of this Agreement, deliver all those
               documents with data and reports, in original if they are
               available to THE CONTRACTOR, which have not been previously
               delivered to THE AFFILIATE.

          6.12 Comply with and cause its subcontractors to comply with:

               a)   all the laws, regulations and any other applicable 
                    provisions in the Republic of Venezuela.

               b)   all the norms set forth by THE AFFILIATE concerning its
                    contractors, including, without limitation, safety,
                    technical, operational, environmental and labor regulations,
                    including specifically the Labor Collective Contract as
                    interpreted by THE AFFILIATE, that is in force and
                    applicable to the Venezuelan oil industry,




                                      -25-
<PAGE>   26

                    as notified to THE CONTRACTOR, during the term of this
                    Agreement.

          6.13 While performing the Operating Services, it shall take the
               necessary steps for the conservation and safety of life,
               property, crops, vegetation, fishing and fisheries, navigation,
               protection of the environment, prevention of pollution,
               disposition of effluent waters, including sea pollution, and the
               personnel safety and health, taking all reasonably necessary
               precautions to minimize damages to the environment.

          6.14 Keep confidential and take all reasonable measures to make sure
               that its employees, Associated Companies, and subcontractors and
               its employees do not disclose to third parties, without the
               previous written consent from THE AFFILIATE, any information
               produced and/or obtained by THE CONTRACTOR in relation to the
               Operating Services and/or the Agreement Area, except when the
               information must be disclosed:

               a)   To governmental authorities acting within the scope of their
                    competence, which will be timely notified to THE AFFILIATE.




                                      -26-
<PAGE>   27

               b)   In relation with requirements of stock exchanges where THE
                    CONTRACTOR's or its Associated Companies' share or
                    instruments are quoted.

               c)   To Associated Companies, professional consultants, banks, or
                    financial entities which reasonably require said
                    information, provided these entities agree in writing to
                    maintain such information strictly confidential.

          6.15 Obtain the authorization from THE AFFILIATE prior to publishing
               any information or publicity which is not in the public domain
               concerning the Operating Services and/or the Agreement Area. THE
               CONTRACTOR shall also demand from the subcontractors thereof to
               comply with this requisite.

          6.16 Make sure that all Hydrocarbons production transferred to THE
               AFFILIATE is of the quality specified in Appendix "A" and in the
               adequate volumes for reception in the facilities of THE
               AFFILIATE. It is understood that, during a test period of six (6)
               months counted from the Production Date, THE AFFILIATE shall
               receive the Crude Oil not meeting the quality specifications
               established in Appendix "A", and the treatment-related costs
               incurred therefor shall be charged to THE CONTRACTOR and imputed
               against future credits. These costs shall not be




                                      -27-
<PAGE>   28

               recovered by THE CONTRACTOR. The Natural Gas not meeting the
               quality specifications established in Appendix "A", subject to
               Clause 7.7, may be received by THE AFFILIATE under the same above
               conditions concerning Crude Oil.

          6.17 Retain control of every leased property and equipment and shall
               have the right to freely remove such property from the Agreement
               Area, except for those goods which, due to their fixed and
               permanent nature, become the property of THE AFFILIATE, without
               prejudice to THE CONTRACTOR's rights to continue using them for
               the Operating Services.

          6.18 Have equal rights as THE AFFILIATE to enter and exit the
               Agreement Area at any time, to and from the facilities inside,
               without interfering with the activities which THE AFFILIATE may
               be performing within the Agreement Area at the Effective Date.

          6.19 Have the right to use, and have access to, and THE AFFILIATE
               shall always make available, provided it is physically and
               legally possible, every geological, geophysical, drilling, well,
               production, and other information which THE AFFILIATE may now or
               in the future have concerning the Agreement Area, and provided
               that it is relevant and necessary to perform the obligations
               hereunder. THE CONTRACTOR shall keep




                                      -28-
<PAGE>   29

               confidential and take every reasonable step to make sure that its
               employees, Associated Companies, and subcontractors and their
               employees do not disclose to third parties, without prior written
               consent from THE AFFILIATE, any information directly or
               indirectly received by THE AFFILIATE hereunder.

          6.20 Be entitled to receive operating and capital fees on the basis of
               Production, as provided in Clause 8, during the term of the
               Agreement.

       7. RIGHTS AND OBLIGATIONS OF THE AFFILIATE

          In addition to the other provisions of this Agreement, THE AFFILIATE
          shall:

          7.1  Have title to all the Hydrocarbons produced and be responsible
               for the payment of the taxes and impositions related to the
               Production.

          7.2  Retain title to all original data and information resulting from
               the Operating Services, including, but not limited to,
               geological, geophysical, petrophysical, engineering, well logs
               and well completion reports and any other data compiled by THE
               CONTRACTOR during the term of this Agreement.




                                      -29-
<PAGE>   30


          7.3  As much as possible, cooperate with THE CONTRACTOR in order to
               facilitate the performance of this Agreement.

          7.4  Notwithstanding the obligations of THE CONTRACTOR hereunder, be
               entitled to inspect the activities of THE CONTRACTOR hereunder
               any time, and request all the information and reports it may
               consider appropriate.

          7.5  During the term of this Agreement, allow the use of the equipment
               and materials that, by virtue of this Agreement, shall become its
               property, only for the Operating Services hereunder, and, in the
               event THE AFFILIATE shall wish to use such equipment for any
               other purpose, it may do it to the extent that it does not
               interfere with THE CONTRACTOR in the performance of the Operating
               Services, and after consulting first with it. Furthermore, THE
               AFFILIATE shall have the right to access the Agreement Area to
               perform operations related to Hydrocarbons to the extent they do
               not interfere with the operations and Work Programs of THE
               CONTRACTOR.

          7.6  Unless Force Majeure circumstances are involved, take the guard
               and custody of all the Crude Oil production meeting the terms
               established hereunder, when THE




                                      -30-
<PAGE>   31

               CONTRACTOR makes it available at the Hydrocarbons Transfer Point,
               on or after the Production Date.

          7.7  Provided that THE AFFILIATE shall have agreed to receive specific
               volumes of Natural Gas, take the immediate custody of the volumes
               agreed when THE CONTRACTOR makes them available at the Gas
               Transfer Point. Unless otherwise agreed upon, THE AFFILIATE shall
               not be obliged to accept the custody of any amount of Natural Gas
               during the term of this Agreement.

               The Parties have agreed to the contrary of the provisions herein
               in the terms and conditions established in Appendix "A".

          7.8  Promptly pay to THE CONTRACTOR every applicable fee as set forth
               in Clause 8 and further in Clause 18.

          7.9  Exercise due diligence to negotiate and complete those agreements
               with third parties, land and real estate owners inside the
               Agreement Area as are necessary to obtain the right of entry or
               other reasonable rights required by THE CONTRACTOR to perform the
               Operating Services hereunder. Any right granted by third parties
               to THE AFFILIATE shall be extended to THE CONTRACTOR during the
               term of this Agreement. Any payment made by THE AFFILIATE







                                      -31-
<PAGE>   32

               concerning such permits and rights shall be reimbursed to THE
               AFFILIATE by THE CONTRACTOR within the forty-five (45) days
               following the submission of the supporting vouchers of such
               costs, which costs will be recovered by THE CONTRACTOR as Capital
               Costs.

          7.10 Maintain as confidential and take all reasonable measures to
               ensure that its employees and Associated Companies do not reveal
               to third parties, without the prior written consent of THE
               CONTRACTOR, information on know-how and technical, financial, or
               other information which is proprietary of THE CONTRACTOR or its
               subcontractors.

          7.11 Coordinate with THE CONTRACTOR, to the extent possible, the
               publication of information or publicity not in the public domain
               relating to the Operating Services, provided that THE AFFILIATE
               has control over these actions.

       8. COMPENSATION OF THE CONTRACTOR

          8.1  THE CONTRACTOR shall be compensated every Quarter on the basis of
               the volume of Hydrocarbons transferred to THE AFFILIATE at the
               Transfer Points, from and including the Production Date, as set
               forth in Clause 18.





                                      -32-
<PAGE>   33

          8.2  The fees for services Of THE CONTRACTOR, including the recovery
               of operating costs, will be paid as Operating Fees on the basis
               of the volume of Hydrocarbons transferred to THE AFFILIATE, as
               set forth in Clause 18.

          8.3  The Capital Costs (and Non-Capital Costs incurred prior to the
               Production Date that are included in the Capital Costs) may be
               recovered as Capital Fees on the basis of the volume of
               Hydrocarbons transferred to THE AFFILIATE, as set forth in Clause
               18.

          8.4  The Incentives for Production Increases will be paid as
               established in Subclause 18.17.

          8.5  The Parties understand that THE AFFILIATE and THE CONTRACTOR are
               subject to the Law on the Value Added Tax ("IVA") and to the
               regulations thereunder, as they may be amended from time to
               time, in relation with the services to be rendered and the
               compensation and reimbursement to be paid, under this Agreement.
               In accordance with the regime in force, THE AFFILIATE will pay
               THE CONTRACTOR, in Bolivars, the IVA amounts that THE CONTRACTOR
               must pay to the Government in relation to the services rendered
               and corresponding compensation under this Agreement. THE
               AFFILIATE shall pay this amount to THE CONTRACTOR within the
               terms established by Law for the payment of IVA by




                                      -33-
<PAGE>   34



               THE CONTRACTOR to the Government, through deposits in an amount
               and bank designated by THE CONTRACTOR, unless otherwise agreed.
               The amount of IVA to be paid by THE AFFILIATE to THE CONTRACTOR
               in independent from and in addition to the compensation and the
               reimbursements due for payment to THE CONTRACTOR in accordance
               with Clauses 8.1 through 8.4 and Clause 18 of this Agreement.

       9. PAYMENTS

          9.1  Except as otherwise specifically provided hereunder, all payments
               due to THE CONTRACTOR shall be made exclusively in Dollars of the
               United States, or, as decided by the Parties, in any other
               currency acceptable to THE CONTRACTOR, at a foreign bank to be
               agreed upon by the Parties, unless otherwise agreed.

               Any Capital Cost and any Non-Capital Costs prior to the
               Production Date incurred in Bolivars shall be paid in Dollars
               reconciled at the average exchange rate for the sale of that
               currency, established by the Banco Central de Venezuela on the
               date such Costs were incurred. Whenever these costs shall have
               been incurred in any currency other than Bolivars and Dollars,
               they shall be converted to Dollars at the exchange rate
               prevailing for the sale of this currency established by the Chase
               Manhattan Bank, New




                                      -34-
<PAGE>   35



               York, Hew York, at 11:00 a.m. on the date the costs were
               incurred.

          9.2  Every payment required as established hereunder shall be made on
               or before the end of the second calendar month following the
               Quarter object of the specific invoice.

               To such purpose, an updated invoice and two (2) copies reflecting
               the Capital Costs and Operating Fees, supported with statements
               of account, shall be submitted by THE CONTRACTOR to THE AFFILIATE
               within the first fifteen (15) Days following the end of the
               corresponding Quarter. THE CONTRACTOR must submit any additional
               documentary support as is required by THE AFFILIATE, including,
               without limitation, any pertinent invoice, contract and record.
               THE AFFILIATE shall be entitled to object to such invoice,
               indicating the reasons for its objection, and, in the event an
               objection were made within twenty-one (21) days from the receipt
               of the invoice by THE AFFILIATE, the payment of any disputed
               amount shall be delayed until the objection is duly settled by
               the Parties.

               The payment of an invoice by THE AFFILIATE shall not be
               considered a waiver by THE AFFILIATE of the right to submit a
               future objection or claim, or of any




                                      -35-
<PAGE>   36

               other right THE AFFILIATE may have concerning such payment. It is
               understood that the disputed amounts shall not accrue any
               interest whatsoever.

     10.  LIABILITIES, INDEMNITIES AND INSURANCE

          10.1 THE CONTRACTOR shall be liable for all injuries (including death)
               of its employees and/or those of its subcontractors, servants,
               agents and/or representatives thereof; and/or for the loss or
               damage to the properties of THE CONTRACTOR and/or its
               subcontractors and/or the properties of its employees, servants,
               agents and/or representatives and/or the properties of the
               employees, servants, agents and/or representatives of its
               subcontractors, unless it demonstrates that the harm or loss or
               damage is due to a non-imputable cause.

          10.2 Subject to the provision of Clause 10.20 of this Agreement, THE
               CONTRACTOR shall be liable for every loss and/or damage to the
               facilities, materials and equipment, whether they are inside the
               Agreement Area or otherwise, of THE AFFILIATE, provided that
               they are under the guard and custody of THE CONTRACTOR as set
               forth hereunder, resulting from the performance by THE CONTRACTOR
               and/or its subcontractors of any activity hereunder.




                                      -36-
<PAGE>   37

          10.3 THE CONTRACTOR shall be liable for any loss and/or damage to the
               properties Of THE AFFILIATE (other than those of THE AFFILIATE
               referred to in Clause 10.2) resulting from the willful misconduct
               or grossly negligent acts or omissions of THE CONTRACTOR and/or
               its subcontractors, and/or Associated Companies.

          10.4 THE CONTRACTOR shall be liable for:

               a)   Every loss and/or damage to the properties of third parties
                    and/or every injury (including death) to any person, which
                    occurs on the occasion or as a result of the performance of
                    this Agreement.

               b)   Every damage to natural resources, except Crude Oil, 
                    Natural Gas, and other minerals in situ, before their
                    extraction to the surface (but not excepting those damages
                    caused by willful misconduct or gross negligence) and every
                    damage to the environment, including, but not limited to,
                    damage or destruction of marine resources, wildlife, timber
                    resources, estuaries, streams or bodies of water, oceans,
                    land or air or any other damage which occur on the occasion
                    or as a result of the performance of this Agreement.




                                      -37-
<PAGE>   38



                    In case of loss of Hydrocarbons for reasons imputable to THE
                    CONTRACTOR or its subcontractors (that is, excluding losses
                    caused by Force Majeure or imputable to third parties), THE
                    CONTRACTOR shall be responsible vis-a-vis THE AFFILIATE for
                    the market value of the Hydrocarbons actually lost
                    (excluding recovered Hydrocarbons), minus THE CONTRACTOR's
                    compensation established in Clause 8 that THE AFFILIATE
                    would have paid to THE CONTRACTOR should those Hydrocarbons
                    have been delivered to it at the corresponding Transfer
                    Point. THE CONTRACTOR shall pay the corresponding amounts
                    within thirty (30) Days from the presentation of an invoice
                    by THE AFFILIATE.

               c)   Any fine or sanction that is imposed on the occasion or as a
                    result of the performance of this Agreement, without
                    prejudice to the right to submit administrative or judicial
                    claims provided by law.

                    The liability of THE CONTRACTOR, referred to in paragraphs
                    a) and b) of this Subclause, is without prejudice to its
                    right to demonstrate the intervention of a non-imputable
                    cause.




                                      -38-

<PAGE>   39

          10.5 THE CONTRACTOR shall hold harmless and indemnify THE AFFILIATE
               from and against any action, cause of action, damages, claims and
               suits whatsoever, whether at law or in equity, sentences,
               including costs and legal fees that may be rendered against THE
               AFFILIATE, arising from any incident referred to in Clauses 10.1,
               10.2, 10.3 and 10.4 hereof, based on the terms and subject to the
               exceptions established therein.

          10.6 THE CONTRACTOR shall hold harmless and indemnify THE AFFILIATE
               from and against any loss, damage and expenses, including
               attorney fees arising from any claim for infringement of a
               patent, copyright or other existing similar rights or to be
               granted, with respect to or arising out of the activities carried
               out by THE CONTRACTOR or its subcontractors hereunder, the
               manufacturing, incorporation or use of any material or equipment
               and/or any technique used in such activities.

          10.7 THE CONTRACTOR shall indemnify, defend and hold harmless against
               any lien and claim over the property of THE AFFILIATE and the
               materials, equipment or structures, or the premises on which they
               are located, provided these liens and claims are not imputable to
               THE AFFILIATE and they arise from or in connection with the
               activities developed by THE




                                      -39-
<PAGE>   40

               CONTRACTOR or its subcontractors hereunder, including, but not
               limited to, workers, materials and other services to be rendered
               by THE CONTRACTOR or its subcontractors or suppliers hereunder.

          10.8 THE CONTRACTOR shall defend and indemnify THE AFFILIATE against
               any claim, action, loss or damage that may affect THE AFFILIATE
               resulting from the failure of THE CONTRACTOR to comply with the
               obligations hereunder.

          10.9 THE AFFILIATE shall include THE CONTRACTOR as co-insured in the
               following corporate policies: All Risk Construction, Properties
               (fire, explosion, lightning, earthquake, Comprehensive Civil
               Liability and Control of Wells) and will include the insurers'
               waiver to its right to surrogate itself, in relation to the
               co-insured.

               THE CONTRACTOR shall reimburse THE AFFILIATE for any additional
               cost to the insurance premiums due to the above, and such costs
               shall be recovered as a Capital Cost, as defined in Clause 18
               herein.

         10.10 THE AFFILIATE shall defend and indemnify THE CONTRACTOR against
               any loss or damage to the properties of THE AFFILIATE covered by
               the corporate insurance policies of THE AFFILIATE, without




                                      -40-
<PAGE>   41
               prejudice to the provisions of Clauses 10.2 and 10.3 above.

         10.11 THE AFFILIATE shall defend and indemnify THE CONTRACTOR against
               any loss or damage resulting from any action taken by THE
               AFFILIATE with its own resources under the circumstances and as
               provided in Clause 5.6 of this Agreement,

         10.12 THE CONTRACTOR may carry, under terms and with insurance
               companies satisfactory to THE AFFILIATE, the following insurance
               policies during the term of this Agreement:

               a)   All Risk Construction.

               b)   Properties.

               c)   Insurance on Wells Control, including:

                    - Cost of Control (including the cost of control of
                      underground blowout)

                    - Redrilling Expenses

                    - Extraordinary Redrilling Expenses

                    - Expenses for Making Well Safe

                    - Expenses for Preparing and Conditioning

                    - Deliberate Well Firing

                    - Clean-up, Containment and Pollution





                                      -41-


<PAGE>   42
               The amounts to be covered under the insurance policies shall be
               equal to the applicable deductibles under the policies referred
               to in Clauses 10.9 and 10.10 hereunder and in accordance with the
               variations they suffer from time to time. Furthermore, it may
               carry insurance for the excess if it considers it convenient.
         
               THE CONTRACTOR may take out, additionally, other insurance
               policies which it considers convenient in relation with the
               Operating Services. The premiums of said policies will be
               considered as Capital Costs if they are approved as part of the
               Budget included in the corresponding Work Program.

     10.13     THE CONTRACTOR shall further carry and maintain the following 
               insurance policies under terms and with insurance companies
               satisfactory to THE AFFILIATE during the term of this Agreement:

               a) Motor Vehicles Liability Insurance covering motor vehicles
                  owned, leased or used by THE CONTRACTOR, in accordance with 
                  Venezuelan legislation.

               b) Workers' Compensation and Employer's Liability Insurance
                  covering the obligations of THE CONTRACTOR with respect to its
                  personnel.





                                     - 42 -
<PAGE>   43
               c) Any other insurance policy as THE AFFILIATE may require from 
                  time to time according to its corporate policies or the nature
                  and location of the Operating Services.

               d) Third Party Liability Insurance, including death or injury to
                  persons and accidents and/or damages to the property, 
                  including properties of THE AFFILIATE.

               The amounts to be covered by the insurance policies shall be
               determined as part of the annual Budget included in the
               corresponding Work Program approved by THE AFFILIATE.


     10.14     The insurance policies carried and maintained by THE CONTRACTOR
               referred to in Clauses 10.12 and 10.13 shall name THE AFFILIATE
               and Petroleos de Venezuela, S.A. as co-insured and include a
               waiver of the rights of the insurer to subrogation in relation to
               the co-insured.

               THE CONTRACTOR shall provide THE AFFILIATE with certificates or
               other documentary evidence showing that such insurance is
               maintained as required hereunder and that the premiums thereof
               have been duly paid.





                                     - 43 -
<PAGE>   44
     10.15     Except as otherwise expressly provided in this Clause 10, the
               obligations of THE CONTRACTOR hereunder shall not be restricted,
               limited nor altered by any provision, stipulation or arrangement
               with respect to the insurance policies, deductible or limitation
               of insurance coverage, nor by any approval of the insurance
               policies by THE AFFILIATE.

     10.16     THE CONTRACTOR shall obtain and furnish a guaranty issued by a
               bank or insurance company satisfactory to THE AFFILIATE, to
               guaranty the proper performance by THE CONTRACTOR of all the
               legal obligations towards employees. Such guaranty shall be in
               accordance with the format to be furnished by THE AFFILIATE and
               cover the amount to be determined by THE AFFILIATE prior to the
               Starting Date of Operations and shall be in force, through annual
               renewals, as from the Starting Date of Operations until fourteen
               (14) months after the termination of this Agreement.

     10.17     Except as otherwise provided in the second paragraph of Clause
               10.9 and the insurance premiums as determined in the annual
               Budget approved by THE AFFILIATE, any cost, expense or debt that
               may arise according to this Clause 10 may not be recovered by THE
               CONTRACTOR as part of the Capital Cost.





                                     - 44 -
<PAGE>   45
     10.18     Neither Party shall be liable before the other for indirect 
               damages or lost profits resulting from the breach of their
               respective obligations hereunder.

     10.19     For the purposes set forth in Clauses 10.9, 10.10, 10.12, 10.13,
               and 10.20, the deductibles and maximum coverage amounts in force
               as of the Effective Date of the Agreement are specified
               hereafter:

<TABLE>
<CAPTION>
                               DEDUCTIBLES   MAXIMUM COVERAGE
                                 (U.S.$)      AMOUNT (U.S.$)
                               -----------   ----------------
<S>                            <C>           <C>
Properties                          *

- -  Fire  and  other                                   *

- -  Earthquake                                         *

- -  Sabotage and Terrorism                             *

- -  Removal of Debris                                  *

- -  Extinction Expenses                                *

- -  Clean Expenses                                     *

Third Party Comprehensive
Liability                           *                 *

Control of Wells                    *                 *

Construction Risk

- -  Construction per
   Contract                         *                 *

- -  Third Party Liability            *                 *

- -  Other Adjacent
   Properties                       *                 *

- -  Transportation                   *                 *
</TABLE>

* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.


                                     - 45 -
<PAGE>   46
               The above amounts are subject to modification. THE AFFILIATE will
               notify THE CONTRACTOR, in writing, the modifications to such
               amounts.

     10.20     THE CONTRACTOR and/or its subcontractors and/or Associated 
               Companies shall be responsible for losses and damages, up to the
               [amount of] the deductible of THE AFFILIATE's corporate insurance
               policies. THE CONTRACTOR and/or its subcontractors and/or
               Associated Companies may exonerate themselves of responsibility
               for payment of losses or damages that exceed the coverage of such
               policies, provided they demonstrate they acted diligently. Any
               other losses or damages not covered by the policies mentioned in
               this clause will be indemnified in accordance with applicable
               law.

     10.21     The provisions of this Clause 10 concern the relationship between
               the Parties, and they have been agreed without prejudice to the
               rights and obligations of each Party with respect to third
               parties.


11.  PROPERTY

     11.1      THE AFFILIATE shall obtain exclusive title to every operating
               facility, goods and/or equipment which is a Capital Cost used by
               THE CONTRACTOR to perform the





                                     - 46 -
<PAGE>   47
               activities hereunder, except any such real property located
               outside the Agreement Area, or movables located either inside or
               outside the Agreement Area, provided that THE AFFILIATE shall
               have specifically authorized THE CONTRACTOR or its
               subcontractors to retain title to such property, for reasons of
               economy or practical convenience.

               Notwithstanding the above, THE CONTRACTOR and its subcontractors
               thereof shall retain title to any movables introduced in the
               Agreement Area by THE CONTRACTOR to be temporarily used or for a
               specific temporary purpose.


     11.2      THE CONTRACTOR shall include in the Work Programs and shall 
               submit to the approval of THE AFFILIATE the leasing plans of the
               movables and real property which qualify as Capital Costs and
               are required for the performance of the activities hereunder, as
               well as the justification thereof.  THE AFFILIATE reserves the
               right to approve or disapprove such request.  


     11.3      The ownership of any technology and/or know-how, whether
               patented or not, as THE CONTRACTOR may specifically develop
               during the performance of the Operating Services shall be common
               to THE AFFILIATE and THE CONTRACTOR.  Notwithstanding such
               common ownership, both THE AFFILIATE and THE CONTRACTOR and  





                                     - 47 -
<PAGE>   48
               their Associated Companies shall have the right to use such
               technology in their own operations at no cost to them.  All the
               information concerning the technology and/or know-how shall be
               delivered to THE AFFILIATE by THE CONTRACTOR.

               Any disclosure of such technology or know-how to a third party
               other than the Associated Companies of THE AFFILIATE and THE
               CONTRACTOR, whether for a consideration or not, shall be subject
               to THE CONTRACTOR and THE AFFILIATE entering into a previous
               written agreement for such purpose.

12.  ARBITRATION

     12.1      Any dispute or controversy related to this Agreement that the
               Parties cannot settle shall be finally resolved through
               arbitration in the City of Caracas, Venezuela.         

     12.2      The arbitration board shall be conformed by three (3)
               arbitrators. Each Party will appoint one (1) arbitrator, who
               will jointly appoint the third arbitrator within thirty (30)
               Days from the appointment of the second arbitrator.  The
               arbitration shall be awarded pursuant to the Applicable Law, but
               the process shall be governed by     





                                     - 48 -
<PAGE>   49
               the Rules of the International Chamber of Commerce ("ICC") in
               force on the Effective Date.

     12.3      The provisions of this Clause 12 will survive the termination of
               this Agreement.                                   

13.  EMPLOYMENT AND TRAINING OF PERSONNEL

     13.1      THE CONTRACTOR shall obtain, hire, pay and maintain all the
               supervisory and administrative personnel, all the skilled and
               non-skilled labor, including any personnel hired abroad, as is
               necessary to perform the Operating Services.  THE CONTRACTOR
               shall only hire persons who are physically and mentally fit and
               technically competent.  As soon as the personnel is hired, THE
               CONTRACTOR shall be responsible for the transportation thereof
               from the point of origin to the locations of the Operating
               Services in Venezuela. THE CONTRACTOR shall further be
               responsible for the return transportation of such personnel to
               the points of origin.  THE CONTRACTOR shall pay all the expenses
               related to such personnel, including, but not limited to, any
               expense incurred in obtaining the passport, visa and solvency;
               hiring expenses; transportation costs and travel expenses.  THE
               AFFILIATE shall not be responsible for providing housing, goods
               or services for the performance of the Operating       





                                     - 49 -
<PAGE>   50
               Services to THE CONTRACTOR, its contractors or its
               subcontractors.

     13.2      THE CONTRACTOR agrees to hire qualified personnel for its
               operations, and, once Production begins, it shall undertake the
               training of Venezuelan personnel required to fill in labor and
               staff positions, including administrative and management
               executive positions.     

     13.3      Costs and expenses incurred in the training of personnel outside
               the regular scope of operations shall be included in Capital
               Costs, provided that the adequate provisions shall have been
               made in the Work Program.                      

     13.4      THE CONTRACTOR is bound to protect, defend and indemnify THE
               AFFILIATE against any claim, demand, damage, obligation, cost
               and expenses whatsoever resulting or derived from the labor or
               work contracts of THE CONTRACTOR, or from any applicable law,
               decree or regulation, pertinent or related to such employment,
               or the breach of such contracts, laws, decrees or regulations. 





                                     - 50 -
<PAGE>   51
14.  ACCELERATED TERMINATION

     If at any time after completing the Minimum Work Program for the first
     thirty-six (36) months of the Agreement THE CONTRACTOR were to find
     evidence of no Crude Oil in the Agreement Area, or that the potential
     Crude Oil bearing formations as exist or as are likely to be found are not
     capable of commercial production because of the possible investment or
     necessary expenses required to undertake such exploitation, THE CONTRACTOR
     may request THE AFFILIATE, in writing, to approve the accelerated
     termination of this Agreement within sixty (60) Days following the date of
     such request.
     
     All the data and information as THE CONTRACTOR may produce to support its
     claim that the Agreement Area is not susceptible to Production must be
     attached to the request.

     Furthermore, THE CONTRACTOR shall promptly provide any additional data and
     information as may be required by THE AFFILIATE to better support the
     claim of THE CONTRACTOR.

     Any refusal by THE AFFILIATE to approve the termination of the Agreement
     under these conditions may not be unreasonable.





                                     - 51 -
<PAGE>   52
15.  ACCOUNTING AND AUDITS

     15.1     All the books and records of THE CONTRACTOR pertinent to the
              operations hereunder shall be kept on a calendar-year basis, abide
              by the Applicable Law and be available to be audited by THE
              AFFILIATE, subject to prior ten (10) Day advance notice. 

              THE CONTRACTOR must further comply with any reasonable special
              instructions or requirements concerning the operations hereunder
              as are indicated by THE AFFILIATE with relation to the books and
              records thereof and the invoicing processes, budget and
              preparation of financial statements.

     15.2     Any time during the term of this Agreement, subject to prior ten
              (10) Day advance notice, THE AFFILIATE shall have the right to
              inspect and audit all the books and accounting of THE CONTRACTOR,
              with respect to any Agreement Year, within five (5) years
              following the end of such Agreement Year, whether directly or
              through independent accountants specifically engaged for that
              purpose.  THE CONTRACTOR shall include in every subcontract
              entered into with respect to this Agreement provisions granting
              THE AFFILIATE the same auditing rights as are granted hereunder.
           




                                     - 52 -
<PAGE>   53
              THE CONTRACTOR shall keep and have available to THE AFFILIATE all
              the books, records and papers and shall cause its subcontractors
              to keep any such records, papers and books as are related to all
              the activities hereunder, so that THE AFFILIATE may exercise the
              rights granted hereinabove.

16.  ASSIGNMENT

     16.1     Neither Party shall have the right to assign or delegate their
              rights or obligations hereunder without previous consent in
              writing from the other Party, except that:

              a) Either Party may execute such assignment or delegation to an
                 Associated Company, provided that the assignor or delegating
                 Party shall remain responsible for the proper and correct
                 performance of its obligations hereunder.

              b) THE CONTRACTOR may subcontract any part of its operations or
                 activities hereunder, provided that the subcontracts shall be
                 subject to reasonable market conditions and shall be awarded to
                 subcontractors who are technically and financially reliable.
                 THE CONTRACTOR shall further be responsible for the performance
                 of  





                                     - 53 -
<PAGE>   54
                 such subcontractors as if the activities were performed by THE
                 CONTRACTOR itself.

     16.2     Unless otherwise agreed upon by the Parties, any subcontract
              referring to Capital Costs that in the aggregate exceeds the
              amount of     *     of the United States
              (U.S.$     *     ) or an equivalent amount in any other currency
              shall be subject to a previous written consent by THE AFFILIATE. 
           
     16.3     Except when duly justified for economic and technical reasons, THE
              CONTRACTOR shall award all subcontracts referred to in Clause
              18.8 on the basis of a competitive process of selection.  To such
              purpose, THE AFFILIATE and THE CONTRACTOR shall establish within
              three (3) months following the Effective Date the documents
              containing the subcontracting, operating, accounting and
              invoicing procedures that are necessary for the adequate
              performance of this Agreement.

17.  OTHER PROVISIONS

     17.1     Every notice required or given by either Party to the other shall
              be deemed to have been received when delivered in writing at the
              address of the addressee.                                    

* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.


                                     - 54 -
<PAGE>   55
              Any such notices shall be address to:


              THE CONTRACTOR                      THE AFFILIATE           
                                                                          
              COMPANIA OCCIDENTAL DE              MARAVEN, S.A.           
              HIDROCARBUROS, INC.                 Av. La Estancia         
              Av. Francisco de Miranda            Edif. Maraven           
              Edif. EASO, Mezzanina-Ofic. A       Chuao, CARACAS 1060     
              Chacaito, CARACAS, 1050             Venezuela               
              Venezuela                           Attn.:  Gerente de      
              Attn.:    Gerente General                   Exploracion     
                                                          y Produccion    
                                                                    

              Either Party may substitute or change the address upon written
              notice to the other Party.


     17.2     Considering the characteristics and nature of the Operating
              Services to be performed hereunder, the provisions set forth in
              Decree No. 1821 dated August 30, 1991, shall not apply to this
              Agreement.  Therefore, every term and condition established herein
              shall be considered to be special contracting condition for the
              purposes of the above-mentioned Decree No. 1821.           

     17.3     Without prejudice to the obligations of THE CONTRACTOR provided in
              Clause 10 herein, any fault or delay by either Party in the
              fulfillment of their obligations or duties hereunder shall be
              excused only to the extent attributable to Force Majeure.
             




                                     - 55 -
<PAGE>   56
     17.4     In the event the operations were delayed, restricted or prevented
              by reason of Force Majeure, the term of this Agreement and every
              right and obligation hereunder shall be extended for a period of
              time equal to the period affected by the Force Majeure, up to a
              maximum of five (5) years.                                       
           
     17.5     The Party whose ability to comply with its obligations is so
              affected shall notify the other Party in writing, indicating the
              cause, and both Parties shall exercise their reasonable endeavors
              to cease or mitigate the effects of such cause, as the case may
              be.                      

     17.6     Except as otherwise provided hereunder, the agreements and pacts
              established in Clauses 6.3, 6.8, 6.9, 6.11, 6.14, the
              confidentiality obligations set forth in Clause 6.19 and any such
              agreements and pacts as are provided in Clauses 10.1, 10.2, 10.3,
              10.4, 10.5, 10.6, 10.7, 10.8, 10.16, 11.3 and 15.2 shall survive
              the termination of this Agreement in relation with information
              received or events which occurred during the term thereof, until
              they are completely satisfied as provided therein.    
        
    17.7      No provision in this Agreement shall constitute THE CONTRACTOR, or
              any of its employees, sub-contractors, or agents, an agent,
              representative or employee of





                                     - 56 -
<PAGE>   57
              THE AFFILIATE. THE CONTRACTOR shall be an independent contractor
              and shall be responsible for and have the control over the details
              and means for performing the Work Program.  Any provision herein
              granting THE AFFILIATE the right to direct THE CONTRACTOR as to
              the details of the performance of the work or to exercise a
              control mechanism over THE CONTRACTOR shall not be construed to
              reduce or release the obligations of THE CONTRACTOR hereunder.

              THE CONTRACTOR is an autonomous company, and its personnel is
              hired for its exclusive account.  As the employer, THE CONTRACTOR
              is solely responsible for the performance of the obligations
              assumed towards its personnel by virtue of the Labor Organic Law
              and the regulations thereof, the Social Security Law and the
              regulations thereof, the INCE Law and the regulations thereof and
              any other law, regulation, decree, resolution or order passed by
              the competent authority, and by virtue of the individual or
              collective contracts entered into with its personnel. Should THE
              AFFILIATE be forced to pay an amount of money for any concept, by
              virtue of a claim filed by any worker of THE CONTRACTOR before the
              judicial authorities or labor administrative authorities or other,
              or by professional associations, unions or by third parties,
              whether Venezuelan or foreigner against THE CONTRACTOR and/or THE
              AFFILIATE, THE





                                     - 57 -
<PAGE>   58
              CONTRACTOR shall immediately reimburse THE AFFILIATE every such
              payment. THE AFFILIATE is authorized by THE CONTRACTOR to deduct
              such amount from any amount as may be owed by THE CONTRACTOR to
              THE AFFILIATE.

              It is agreed by the Parties that THE CONTRACTOR shall be
              responsible for settling, under acceptable terms and at its own
              discretion, any strike or act planned by the workers of the
              CONTRACTOR, provided that such situation shall not affect THE
              AFFILIATE or the Venezuelan Oil Industry, and, in such event, THE
              AFFILIATE and THE CONTRACTOR shall jointly seek solutions to
              remedy the situation as soon as possible.

    17.8      It is the intention of the Parties that common reservoirs that may
              exist in the Agreement Area and other adjacent areas be the
              subject of unified extraction agreements.  The Parties will
              dedicate their efforts to achieve such agreements.             

18. ACCOUNTING PROCEDURES

    18.1      The following provisions set forth to implement the payment of
              fees between THE CONTRACTOR and THE AFFILIATE are solely and only
              for the purpose of calculating the fees of THE CONTRACTOR.  Both
              THE AFFILIATE and THE CONTRACTOR shall be responsible for     





                                     - 58 -
<PAGE>   59
              the Venezuelan taxes pursuant to the Venezuelan tax laws in force,
              and nothing in this Clause 18 shall be construed in any way to be
              contrary to such laws and regulations.

    18.2      Definitions: The provisions of this Clause 18 shall be followed
              and observed in the compliance of the obligations of each Party
              hereunder. The definition and terms in this Clause 18 shall have
              the meanings herein indicated.                         

    18.3      Accounting and Records: The records and accounting books of THE
              CONTRACTOR shall be kept according to accounting systems generally
              accepted and recognized, consistent with the current practices and
              procedures of the oil industry (PDVSA and its Affiliates) and
              according to the Venezuelan practice.

              In the event of any inconsistency or doubt between the accounting
              systems and practices generally accepted and the current
              procedures of the oil industry, the Parties must solve them by
              mutual agreement taking into consideration the Accounting Norms
              and Procedures from PDVSA which have been notified to THE
              CONTRACTOR.  THE CONTRACTOR shall organize and prepare reports for
              the use of THE AFFILIATE in the performance of its
              responsibilities hereunder.





                                     - 59 -
<PAGE>   60
    18.4      Non-Capital Costs: Non-Capital Costs are those reasonable and
              necessary expenses actually incurred by THE CONTRACTOR, related to
              the current year operations, provided that they are included as
              Non-Capital Costs in the pertinent Budget.

              The Non-Capital Costs include, but are not limited to, the
              following:

              a)   Labor, materials and services used in daily oil operations,
                   including field facilities operations, secondary and tertiary
                   recovery and other enhanced recovery operations, storage,
                   handling, hauling and processing operations, measurement, and
                   other operational activities, including surface and 
                   subsurface equipment repair and maintenance.

              b)   Office, services and general administration of main and
                   field offices in Venezuela, general services, including
                   technical and related services, tangible services, hauling,
                   lease of special or heavy equipment, personnel expenses,
                   public relations and any other expenses incurred abroad which
                   do not qualify as a Capital Cost in accordance with this
                   Agreement.                      





                                     - 60 -
<PAGE>   61
              c) Auxiliary or temporary facilities having less than one (1)
                 year of [useful] life. 
              
              d) Every technical or managerial cost other than those 
                 specifically covered in Clause 18.5.   
              
   18.5       Capital Costs: Capital Costs are those reasonable and necessary
              disbursements actually made by THE CONTRACTOR for items that
              normally have a useful life beyond the year they are incurred,
              provided they are included in the pertinent Budget as Capital
              Costs and, further provided, in the case of equipment and/or
              facilities, that they already be located in the Agreement Area.
        
              The Capital Costs include, but are not limited to, the
              classification described herein: 

              a) Drilling of wells: all tangible and intangible costs for
                 drilling of wells, including drilling of test, delineation,
                 [and] injection wells, as well as the initial construction of
                 access roads leading to the wells.           

              b) Rehabilitation of wells: All the tangible and intangible costs
                 for the rehabilitation of wells, including redrilling or 
                 recompletion of wells, initial installation of artificial





                                     - 61 -
<PAGE>   62
                 lifting equipment, changes of producing intervals, initial
                 gravel packing, stimulations and fractures.  Every other
                 rehabilitation shall be considered a Non-Capital Cost.
        
              c) Construction of Service [facilities]: Workshops, energy and 
                 water facilities, warehouses and field roads.  Cost of oil
                 piers and anchorages, treatment plants and equipment, systems
                 of secondary and/or enhanced recovery, gas plants and steam
                 systems.
        
              d) Production facilities, including the costs for fuel, hauling 
                 and supplies for construction outside the Agreement Area and
                 installation in the Agreement Area, and other construction
                 costs incurred for the erection of platforms and installation
                 of piping, wellhead equipment, subsurface lifting equipment,
                 production tubing, sucker rods, surface pumps, flow lines,
                 gathering equipment, delivery lines and storage facilities,
                 excluding costs relating to the personnel that will be in
                 charge of operating such facilities.

              e) Equipment: Drilling and surface and subsurface production
                 tools, equipment and instruments, bares, floating equipment,
                 automotive equipment,





                                     - 62 -
<PAGE>   63
                 aircraft, construction equipment, furniture and office 
                 equipment, and miscellaneous equipment.

              f) Personnel, materials and services used in aerial, geological,
                 topographical, geophysical and seismic surveys; core drilling
                 and other non-routine surveys related to production 
                 maintenance.

              g) Certain annual costs, including insurance costs, import duties
                 related to capital items, any national, state, local or
                 municipal taxes, other than Venezuelan Income Tax and taxes
                 which provide tax credits against Venezuelan Income Tax,
                 certificate of occupancy and rights of way, land or real
                 property rentals and the costs of any geological or geophysical
                 information acquired, independent technical studies and
                 independent reserve estimates reports and training of
                 Venezuelan labor and professional staff outside the normal
                 scope of operations.

              h) Labor, materials and services associated with Capital 
                 projects, and reasonable amount of spare parts and material 
                 inventory associated with Capital projects.





                                     - 63 -
<PAGE>   64
    18.6      Overhead Allocation: No general overhead costs incurred outside
              Venezuela shall be included as Capital or Non-Capital Costs. Only
              those costs qualifying as Capital Costs and covered by specific
              agreements approved by THE AFFILIATE shall be recovered as 
              Capital Costs.      

    18.7      Unrecovered Capital Costs and Interests: The Unrecovered Capital
              Costs are that portion of the total Capital Costs spent up to 
              the end of the previous Quarter that, complying with the 
              conditions established hereunder, have not yet been recovered as
              Capital Fees.

              The total Unrecovered Capital Costs as of the end of the preceding
              Quarter may accrue interest at                *                   
              rate corresponding to five (5) working days previous to the
              beginning date of the considered Quarter or the previous Friday,
              if such date happens to be either a Saturday, Sunday or a holiday
              in the United States of America.  The referenced rate shall be the
              average of the rates provided at 11:00 a.m. (New York time) by the
              following banks, Chase Manhattan Bank, Bankers Trust and Bank of
              Tokyo.  Such interest (hereinafter called "Interest Rate") shall
              be paid as provided in Clause 18.12.

    * Confidential portion has been omitted pursuant to a request for 
      confidential treatment and filed separately with the Commission.



                                     - 64 -
<PAGE>   65
    18.8      Except where inconvenient from the economic and practical point 
              of view, any agreement with third parties for the acquisition of
              capital goods, technical or other services to be considered as
              Capital Costs or as Non-Capital Costs prior to the Production Date
              shall be awarded on the basis of competitive tenders, always
              trying to assure costs not exceeding the prevailing market levels.

              In the event that the services or leased equipment were supplied
              by Associated Companies of THE CONTRACTOR, only such costs as are
              the lower of,

              a) the net cost of services rendered or equipment leased for the
                 Associated Companies of THE CONTRACTOR which provided them; and

              b) the standard commercial fee charged by third parties for
                 supplying such goods and services 

              will be recognized. 
   
    18.9      After establishing the Production Date, THE CONTRACTOR shall 
              recover all the costs and fees every quarter as set forth in the
              terms and conditions herein and as further specified, on the 
              basis of the volume of Hydrocarbons transferred to THE AFFILIATE





                                     - 65 -
<PAGE>   66
              at the Points of Transference, measured in accordance with the
              norms ruling the matter.

    18.10     All the Costs of THE CONTRACTOR other than Capital and [other
              than] Non-Capital Costs prior to the Production Date, including
              but not limited to operating costs and fees for the services of
              THE CONTRACTOR, may only be recovered through the Operating Fees
              ("OPFee").                                                      

              The OPFee shall be calculated according to the Crude Oil
              Production delivered to THE AFFILIATE.

              If the volume of Crude Oil Production delivered to THE AFFILIATE
              is          *         the OPFee is equal to       *         .

              If the volume of Crude Oil Production delivered to THE AFFILIATE
              is        *       , the OPFee shall be calculated according to
              the following formula:


                                       *


              If the volume of Crude Oil Production delivered to THE AFFILIATE
              is       *       , the OPFee shall be calculated according to the
              following formula:


                                          * 

    * Confidential portion has been omitted pursuant to a request for 
      confidential treatment and filed separately with the Commission.
                                  




                                     - 66 -
<PAGE>   67
  WHERE:



                                 *


                                 *

                     *
                      
                     *

                     *
  
                     *

                     *

              The OPFee shall be subject to adjustments after the Quarter that
              includes the Effective Date hereof as follows:

              As of the Quarter following the one that includes the Effective
              Date hereof, the "$/Barrel OPFee" of THE CONTRACTOR shall be
              adjusted for inflation every Quarter, so that the OPFee shall
              reflect an adjusted value every succeeding Quarter.

              The inflation adjusted $/Barrel OPFee formula shall be determined
              according to the following formula:

              * Confidential portion has been omitted pursuant to a request for
                confidential treatment and filed separately with the Commission.




                                     - 67 -
<PAGE>   68
                   *
                    



                   *

                   *

                   *

                   *


                   *

- ----------------
(*) The inflation index applicable in determining the OPFee adjusted
    for any Quarter after the first Quarter subsequent to the Effective Date
    hereof shall be the "Special Index-Energy" (unadjusted) of the "Consumer
    Price Index" for all "Urban Consumers" (CPI-U), United States City Average
    (based period 1982-1984 = 100) of the "Summary Data from the Consumer Price
    Index News Release" as published every month by the "United States 
    Department of Labor Statistics, Washington, D.C. 20212."

    Should the inflation index, as indicated every month in the "News Release"
    described above suffer corrections at any time after its publication and
    utilization for OPFee adjustments, a suitable reconciliation to the invoices
    of the following Quarter shall be applied.

    Should the index of the base period (1982-1984 = 100) be revised, it must be
    clear that the intent of this indexing provision is to adjust the OPFee in
    proportion to the average price level in the Previous Quarter to the Quarter
    being invoiced, by using the information of the three (3) months of the
    Current Quarter and that of the three (3) months of the Previous Quarter.

    * Confidential portion has been omitted pursuant to a request for
      confidential treatment and filed separately with the Commission.




                                     - 68 -
<PAGE>   69
              The procedures hereinabove described shall be applied subsequent 
              to the Effective Date hereof.

    18.11     Capital Costs (and Non-Capital Costs prior to the Production Date,
              that by definition are Capital Costs), shall be recovered as
              Capital Fees (CFee).  It being understood that Capital Fees (CFee)
              [are the] cumulative recovery of Capital Costs accounted for up to
              the end of the Quarter being invoiced, calculated by the straight-
              line method over ten (10) years.  It is understood that, under no
              circumstances, the compensation formula herein established will
              give rise to a double recovery of any Capital Cost.

              The Capital Costs incurred after the tenth (10th) Year of the
              Agreement shall be recovered by the straight-line method, during
              the remainder of the time the Agreement is in force, provided
              that the Maximum Total Fee ("MTF") so permits.

              The recovery of the CFee for Capital and Non-Capital Costs prior
              to the Production Date shall be calculated as of the Production
              Date.

    18.12     The interest referred to in Clause 18.7 may be charged and
              recovered as part of Capital Costs and





                                     - 69 -
<PAGE>   70
              Non-Capital Costs in the aggregate of Unrecovered Capital Costs,
              as follows:


              *


              *

              *

              *

              No interests on the Capital Costs prior to the Production Date
              shall be accrued nor paid.  Even though the interests shall be
              treated as part of the Capital Costs in the recovery process, no
              interests shall be accrued by such interests.

     18.13    The total compensation to be received by THE CONTRACTOR in any 
              Quarter, as set forth in Clauses 18.10, 18.11 and 18.12 shall not
              exceed the amount of $/bbl equal to the Maximum Total Fee (MTF)
              adjusted as established below.

     * Confidential portion has been omitted pursuant to a request for
       confidential treatment and filed separately with the Commission.






                                     - 70 -
<PAGE>   71
              The initial Maximum Total Fee (MTF) payable by THE AFFILIATE in
              any Quarter shall be   *   US$/Bbl adjusted according to the
              following paragraphs:

              The Maximum Total Fee (MTF) payable by THE AFFILIATE in any
              Quarter shall be subject to indexation so that the adjusted value
              shall be reflected by the MTF for the subsequent Quarters.  Such
              indexation adjustment shall be based on the variation upwards or
              downwards in the Price of a Basket of Products ("PCP") applicable
              to light, medium or heavy crudes, as corresponding in accordance
              with the gravity of the Hydrocarbons delivered to THE AFFILIATE,
              according to the price formulas stated below:

              LIGHT CRUDE is the one the gravity of which is higher or equal to
              30 degrees API,

              MEDIUM CRUDE is the one the gravity of which ranges between 21.9
              degrees and 29.9 degrees API,

              HEAVY CRUDE is the one the gravity of which is lower than 21.9
              degrees API.

              The PCP for LIGHT CRUDES shall be calculated according to the
              following formula:

                                       *

              * Confidential portion has been omitted pursuant to a request
                for confidential treatment and filed separately with the
                Commission.





                                     - 71 -
<PAGE>   72
              The PCP for MEDIUM CRUDES shall be calculated according to the
              following formula:

                                          *

              The PPB for HEAVY CRUDES shall be calculated according to the
              following formula:

                                          * 



                                          *              


                                                                 


              Should any of the components of the basket of products not be
              published on a routine basis, or should an anomalous quotation
              appear, the Parties shall meet to agree upon a revised Basket of
              Products in order to determine the indexation of the Maximum Total
              Fee.

              * Confidential portion has been omitted pursuant to a request for
                confidential treatment and filed separately with the Commission.





                                     - 72 -
<PAGE>   73
              The initial Maximum Total Fee (MTF) as specified above shall
              be adjusted according to the formula stated below, so that, to
              adjust the MTF, the first Current Quarter shall be the first
              Quarter of 1993 and the first Previous Quarter shall be the fourth
              Quarter of 1992, so that each succeeding Quarter reflects the
              adjusted level:

                                            *  
                                             
              WHERE:

                                            *

                                            *

                                            *

                                            *

              * Confidential portion has been omitted pursuant to a request for
                confidential treatment and filed separately with the Commission.


                                     - 73 -
<PAGE>   74
    18.14     Any unrecovered Capital Fee (CFee) because of limitations of the
              Maximum Total Fee (MTF) in any Quarter, may be carried forward for
              a later recovery during the term of this Agreement; provided that
              this is allowed by the adjusted Maximum Total Fee (MTF).

              Any unrecovered Operations Fee because of limitations of the
              Maximum Total Fee (MTF) in any Quarter, may be carried forward for
              a later recovery during the term of this Agreement, provided that
              this is allowed by the adjusted Maximum Total Fee.  These
              Operating Fees carried forward shall not accrue interests nor
              shall they be subject to an inflation indexing adjustment.

              In any Quarter, THE CONTRACTOR shall first recover the current
              Operating Fees and the previous unrecovered Operating Fees,
              followed by any current interest and the previous unrecovered
              interests, and finally, the current Capital Fees and the previous
              unrecovered Capital Fees to the extent allowed by the prevailing
              Maximum Total Fee (MTF).

    18.15     Natural Gas Transferences: If no alternate agreement between THE
              CONTRACTOR and THE AFFILIATE has been reached, one (1) barrel of
              Crude Oil for each 39,600 standard cubic feet of Natural Gas,
              measured at 14.7 lpc and 60 degrees F delivered to THE AFFILIATE,
              as set forth




                                     - 74 -
<PAGE>   75
              in Clause 7.7 hereof shall be credited to THE CONTRACTOR as
              delivered to THE AFFILIATE.

    18.16     Inspection Points: In the event an inspection were necessary to
              meet the requirements and regulations on Hydrocarbons production
              in the area as established by the Ministry of Energy and Mines, at
              one or more points inside or near the Agreement Area, such
              inspection shall constitute no transference of Hydrocarbons nor
              indicate acceptance of the custody by THE AFFILIATE.  This custody
              will be accepted only at the Crude Oil and/or Natural Gas
              Transference Points and under the terms hereunder.

    18.17     Incentive for Production Increment: THE AFFILIATE agrees to pay to
              THE CONTRACTOR * Dollars of the United States of America per
              barrel (US$*/Bl), for each barrel of Hydrocarbons produced and
              delivered to THE AFFILIATE, above the level established by THE
              AFFILIATE, which hereinafter shall be considered accumulated
              production.  This incentive is additional to the Operating Fee and
              Capital Fee and independent from the Maximum Total Fee (MTF), and
              shall be payable as set forth in Clause 9.2.

              Said incentive shall be subject to indexing following the same
              procedure established for the Maximum Total Fee ("MTF"), according
              to Subclause 18.13 above.

    * Confidential portion has been omitted pursuant to a request for
      confidential treatment and filed separately with the Commission.




                                     - 75 -
<PAGE>   76

<TABLE>
<CAPTION>

                   ACCUMULATED PRODUCTION       INCENTIVE
                       (MMBls)                   (US$/Bl)
                   <S>                           <C>
                          52.0                       *
</TABLE>

* Confidential portion has been omitted pursuant to a request for
  confidential treatment and filed separately with the Commission.




19. TERM AND APPLICABLE LAW

    19.1      This Agreement shall be in force as of the Effective Date.

    19.2      This Agreement shall be construed and governed by the Laws of the
              Republic of Venezuela, which are defined in Clause 2.29 as the
              Applicable Law.
 
    19.3      This Agreement shall not be amended nor modified in any way except
              by mutual agreement in writing of the Parties.

    19.4      In witness whereof, the Parties have signed two (2) identical
              copies of this Agreement, in the City of Caracas, on the 
              nineteenth (19th) day of the month of November, 1993.       


By THE AFFILIATE                             By THE CONTRACTOR


      (Signed)                                      (Signed)  
- --------------------------                   --------------------------
  Eduardo Lopez Quevedo                            Joseph F. Snape
       President                                      President





                                     - 76 -
<PAGE>   77
                                  APPENDIX "A"

                          DESCRIPTION OF AGREEMENT AREA

AREA

The area of the agreement is located in the State of Zulia, comprises 391,973.51
hectares and is included within the area which corners are defined by U.T.M.
coordinates as indicated in the map included as Appendix "B".

TRANSFER POINTS AND CONDITIONS OF TRANSFER

<TABLE>
<CAPTION>
           TRANSFER POINT                                         CONDITION
           --------------                                         ---------

<S>                                                    <C>
Crude oil

     Alpuf Flow Station for the                        Stabilized crude with less
     Alturitas, San Julian, San                        than 0.5% BS&W 23-30 degrees API.
     Jose, Machiques, Totumos,
     and Alpuf fields.

     Garcia Urdaneta Plant for                         Stabilized crude with less
     the Garcia Urdaneta field.                        than 0.5% BS&W 23-30 degrees API.

Natural Gas

     Alpuf Flow Station for the                        Less than 20 ppm of H(2)S.
     Alturitas, San Julian, San
     Jose, Machiques, Totumos,
     and Alpuf fields.

     Garcia Urdaneta Plant for                         Less than 20 ppm of H(2)S.
     the Garcia Urdaneta field.

     The Affiliate accepts to
     receive all the available
     treated Natural Gas.
</TABLE>


                                     A - 1
<PAGE>   78
OPERATORSHIP CONDITIONS

The Contractor will be responsible for the construction, operation and
maintenance of all necessary production, separation, measurement, treating,
storage, dehydration, and disposal facilities in order to transport the crude to
the transfer points.

While the construction of the Alpuf Flow Station is in progress (6 months
maximum), the Parties will agree, in writing, the dehydration costs in Punta de
Palmas and other basic services which Maraven will charge the Contractor.




                                     A - 2
<PAGE>   79

                                  APPENDIX "B"

                              MAP OF AGREEMENT AREA


                                     B - 1
<PAGE>   80
                                  APPENDIX "C"

                        MINIMUM WORK PROGRAM AGREED UPON

<TABLE>
<CAPTION>
ACTIVITIES                                   1st YEAR            2nd YEAR            3rd YEAR         TOTAL
- ----------                                   --------            --------            --------         -----
<S>                                          <C>                 <C>                 <C>              <C>
*                                             *                                      *                *

*                                             *                    *                 *                *

*                                             *                    *                 *                *

*                                             *                    *                 *                *

*                                                                                    *                *

*                                                                                                     

*                                             *                                                       *

*                                             *                                                       *

*                                             *                                                       

*                                                                                                     *

*                                             *                                      *                

*                                             *                                                       *

*                                                                                    *                *

*                                             *                                                       *

*                                                                   *                

*                                             *                     *                *                *

*                                                                   *                *                *
</TABLE>

       * Confidential portion has been omitted pursuant to a request for
         confidential treatment and filed separately with the Commission.
 



                                     C - 1
<PAGE>   81
Service to wells consists of hydraulic pump/ESP change outs. Rehabilitation to
Wells consists of asphaltene/restimulation jobs. Technical advising includes
VSD/ESP consultants. All others will be inhouse staff.

<TABLE>
<CAPTION>
                                                                             MM $
                                             --------------------------------------------------------------
ACTIVITIES                                   1st YEAR            2nd YEAR            3rd YEAR         TOTAL
- ----------                                   --------            --------            --------         -----
<S>                                          <C>                 <C>                 <C>              <C>
CAPITAL

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*

*

*

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*

*

*                                                                                     *              *   
</TABLE>

         * Confidential portion has been omitted pursuant to a request for
           confidential treatment and filed separately with the Commission.


                                     C - 2
<PAGE>   82
<TABLE>
<CAPTION>
                                                                             MM $
                                             --------------------------------------------------------------
ACTIVITIES                                   1st YEAR            2nd YEAR            3rd YEAR         TOTAL
- ----------                                   --------            --------            --------         -----
CAPITAL (cont.)
- ---------------
<S>                                          <C>                 <C>                 <C>              <C>
*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

Subtotal                                     *                    *                  *                *

EXPENDITURES
- ------------
*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 
                                          --------             --------            --------         ------
Subtotal                                     *                    *                  *                *
                                          --------             --------            --------         ------
TOTAL                                        *                    *                  *                *
</TABLE>

         * Confidential portion has been omitted pursuant to a request for
           confidential treatment and filed separately with the Commission.



                                     C - 3
<PAGE>   83

                                  APPENDIX "D"

                    FORM OF THE IRREVOCABLE GUARANTY FOR THE
                     GUARANTEED PORTION OF THE WORK PROGRAM
                      FOR THE FIRST THIRTY-SIX (36) MONTHS

FROM: BANK
TO:   THE AFFILIATE

We hereby establish our irrevocable "Stand-By" Letter of Credit No. ________ in
favor of Maraven S.A. ("THE AFFILIATE"), for the account of (Name and address
of THE CONTRACTOR) up to a total amount of U.S.$_____________ to secure the
satisfactory performance of the Minimum Work Program obligations of (Name of THE
CONTRACTOR), as provided in the Operating Services Agreement for (Area Name)
entered into by (THE CONTRACTOR) and (THE AFFILIATE) on (Date of Execution).

TERMS

I.   This "Stand-By" Letter of Credit is available for payment at sight by us,
     against submission of a tested telex advising bank, stating that the
     advising bank has received a certificate or tested telex from THE AFFILIATE
     stating:

     QUOTE

     (1)  We demand payment for U.S.$(to be indicated by THE AFFILIATE) since
          (Name of THE CONTRACTOR) has defaulted its obligations within the
          Minimum Work Program, as provided in the Operating Services Agreement
          for (Area Name) entered into between (THE CONTRACTOR) and ourselves on
          (date of execution).

     (2)  The amount demanded hereby represents the overdue obligations of THE
          CONTRACTOR, according to the aforementioned Agreement.

     UNQUOTE 

II.  The amount under this "Stand-By" Letter of Credit shall be reduced in such
     amounts as are to be indicated by (THE AFFILIATE) at the end of each
     calendar quarter from the date on which this "Stand-By" Letter of Credit
     becomes effective, in accordance with paragraph "C", "Other Conditions,"
     below, provided that we (Bank) receive a telex from (THE AFFILIATE),
     stating:

     QUOTE

     We hereby authorize (Bank) to reduce the amount under your "Stand-By"
     Letter of Credit No. __________ in an amount equal to U.S.$ (to be
     indicated by THE AFFILIATE), that represents the portion of the
     obligations already performed by (THE


                                     D - 1
<PAGE>   84

     CONTRACTOR), of the Minimum Work Program, as set forth in the Operating
     Services Agreement entered into between (THE CONTRACTOR) and ourselves on
     (Date of Execution). It is understood that the above-mentioned "Stand-By"
     Letter of Credit shall be in force for the remaining balance of U.S.$(to be
     inserted).

     UNQUOTE

OTHER CONDITIONS

A.   We (Bank) are bound by this "Stand-By" Letter of Credit to pay in an
     irrevocable and absolute manner to THE AFFILIATE upon submission of the
     document mentioned under Condition 1 above.

B.   All Bank fees related to this Letter of Credit are for the account of (THE
     CONTRACTOR).

C.   This Letter of Credit shall be in force for a period of thirty-seven (37)
     months as of the Starting Date of Operations, but not later than
     ________________, ___________, as notified to us through a tested telex by
     the advising bank, in which the advising bank states that it has received
     from THE AFFILIATE a certificate or tested telex containing the Starting
     Date of Operations or a statement indicating that the operations will not
     start on the proposed Starting Date of Operations for reasons imputable to
     THE CONTRACTOR, in accordance with the form of Annex I.

D.   We shall make the payment under the "Stand-By" Letter of Credit in Dollars
     of the United States of America upon submission of the document required
     and without requesting any evidence or condition concerning the accuracy of
     the statements made in such document, and irrespective of whether (THE
     CONTRACTOR) has previously filed a bankruptcy, reorganization or delay
     procedure.

E.   This Credit is subject to the uniform rules and practices for documentary
     credits (revision 1983) of the International Chamber of Commerce,
     Publication 400, except with respect to Article 19 of such rules.
     Thereupon, in the event our activities were interrupted by the reasons
     established in said article, we (Bank) are bound to pay on the first
     banking day following the interruption of such causes the amount to be
     indicated by THE AFFILIATE via telex, as mentioned in Condition 1 above, up
     to an amount not to exceed the one indicated in this "Stand-By" Letter of
     Credit, if the term of this "Stand-By" Letter of Credit shall have expired
     during the interruption of our activities.

F.   References to the Operating Services Agreement or to its terms or
     conditions are made herein only for identification purposes and such
     document is not incorporated to this "Stand-By" Letter of Credit.


                                     D - 2
<PAGE>   85

G.   This tested telex is the operative instrument of credit and shall not be
     further confirmed by mail.




                                     D - 3
<PAGE>   86

                                  APPENDIX "D"

                                    ANNEX I

                         STARTING OPERATIONS CERTIFICATE

I, _________________, the bearer of Identity Card No. ________________, acting
on behalf of Maraven S.A., hereby confirm that the Letter of Credit No. _______
issued in our favor for the account of Compania Occidental de Hidrocarburos,
Inc., will become effective on ____________, 199__, because [the Starting
Date of Operations took place on ______________, 199___ (or) the works did not
commence on the proposed Starting Date of Operations for reasons imputable to
THE CONTRACTOR].

In witness whereof, the undersigned subscribed this certificate or authorizes
this tested telex on _________, 199___.

By:
   -----------------------------
            Maraven S.A.





                                     D - 4
<PAGE>   87

                                  APPENDIX "F"

                         STARTING OPERATIONS CERTIFICATE

I, ________________, the bearer of Identity Card No. _______________, acting on
behalf of (THE AFFILIATE), party of the first part; and ___________________,
acting an behalf of THE CONTRACTOR, party of the second part, in his capacity as
_______________, hereby confirm, as provided in Clause 2.6 of the Operating
Services Agreement for the Unit ______, entered into between the PARTIES, that
the Operating Services corresponding to the mentioned AGREEMENT will start at
_____ on the _____ day of the month of ____________________ 199____. 

In witness whereof, the undersigned subscribed this CERTIFICATE on the _______
day of the month of __________________, 199__.

By THE AFFILIATE                        By THE CONTRACTOR


- --------------------------------        ---------------------------------


                                      F-1
<PAGE>   88
                                                                       
The undersigned, MARIA ISABEL MARTINEZ GARCIA, Bearer of Venezuelan Identity
Card No. 5.062.225, a Certified Public Interpreter for the English Language of
the Republic of Venezuela, as evidenced by and Official License issued unto her
and published in Official Gazette No. 32686 of March 16th 1983 and registered
at the Main Bureau of Public Registry of Federal District under No. 495, Folio
286, of Protocol 2, Volume 2 on February 24th, 1983 hereby certify that the
attached original document written in Spanish has been submitted to her for
translation and the following is a true English version thereof.

                                 ADDENDUM No. 1

              TO THE OPERATING SERVICES AGREEMENT FOR UNIT D.Z.O.

This Addendum No. 1 to the Operation of Services Agreement for Unit DZO
(hereinafter referred to as the "Addendum") has been held and undersigned on
December seventh (7th) 1994 by MARAVEN, S.A.(hereinafter referred to as "THE
SUBSIDIARY"), on one part, represented by its President Mr. Emilio Abouhamad,
duly authorized as per Bylaws of THE SUBSIDIARY and COMPANIA OCCIDENTAL DE
HIDROCARBUROS, INC. on the other (hereinafter referred to as "THE CONTRACTOR"),
corporation organized and existing under the laws of California, USA,
represented by its President and General Manager, Mr. Carlos del Solar, duly
authorized as per power of attorney registered before the 


Legend 

     *  Confidential portion has been omitted pursuant to a request for 
        confidential treatment and filed separately with the Commission.

                                                                               1
<PAGE>   89
First Mercantile Registry Office of the Judicial Circumscription of Federal
District and State of Miranda, on May 12, 1994, under No. 58, Volume 3-C PRO:

1.       GENERAL PROVISIONS.

         1.1.    THE SUBSIDIARY AND THE CONTRACTOR undersigned an Operation of
Services Agreement on November 19, 1993 (hereinafter referred to as "THE
AGREEMENT"), under which THE CONTRACTOR operates, under the terms and
conditions therein agreed, the unit DZO (hereinafter referred to as THE UNIT).

         1.2.    The terms defined on Clause 2 of the Agreement that shall be
used on this Addendum and that are not defined herein, shall have the same
meaning assigned by them on the Agreement.  On Article two (2) of this
Addendum, the term "Production of Crude Oil" shall be used with the term
"Production" on Sub clause 2.9 of the Agreement, but referred only to Crude Oil
and not to Natural Gas.

         1.3.     In compliance with Sub clause 19.3 of the Agreement, the
Parties have decided to undersign this Addendum in order to reflect certain
explanations and amendments to the Agreement consistent with the mutual
intention of the Parties and a more efficient operation of the Unit.




                                                                              
                                                                               2
<PAGE>   90
2.       TRANSFERENCE POINT AND CRUDE OIL TRANSPORTATION

         2.1     Unless the parties agree the contrary, The Transference Point
of Crude Oil to all fields, with the exception of Garcia Urdaneta, shall be
relocated to Matapalo and the Transference Point of Natural Gas for all fields
shall be relocated to Los Claros.  Therefore, THE CONTRACTOR shall be
responsible for any additional expansion, as well as of the operation,
maintenance and repairs of the facilities required for the transportation on
Hidrocarbons in the Agreement Area to the Transference Points.

         2.2     In the same manner THE CONTRACTOR agrees to be responsible
for:

                 i)       the construction of a pumping station in Matapalo, in
order to allow the delivery to THE SUBSIDIARY'S crude transportation system,
The Production of Crude Oil in excess to the present capacity of twenty six
thousand barrels per day.

                 ii)      The expansion of the capacity of the transportation
system for the Production of Crude Oil between the Matapalo Station and
Platform PE-2-9, in the event the production exceeds the Transportation
capacity of 40 thousand barrels per day, which is estimated to have that
transportation system, once THE CONTRACTOR builds the pumping station referred
to on the preceding 2.2.(i).  The obligation of THE SUBSIDIARY of receiving
the Production of Crude Oil, in excess of 40 thousand barrels per day, shall be
subject to the construction and 



                                                                              
                                                                               3
<PAGE>   91
adequate conditions of operations by THE CONTRACTOR, of the referred expansion
to the transportation system between Matapalo Station and Platform PE-2-9.

         2.3     The payments incurred by THE CONTRACTOR in fulfillment of the
additional obligations assumed in 2.1 and 2.2 herein shall qualify as Capital
Costs, subject to the conditions stated on Clause 18.5 of the Agreement.

         2.4     It is expressly understood that the operation, maintenance and
repair of the transportation system between Matapalo and Platform PE-2-9
referred to in 2.2 (ii) herein shall be of the sole responsibility of THE
SUBSIDIARY, once THE CONTRACTOR constructs it and places it in adequate
operating conditions.

          2.5    It is expressly understood that the transportation system THE
CONTRACTOR agrees to expand herein indicated shall be for the exclusive use of
the Production of Unit DZO during the term of the Agreement.

3.       REMUNERATION PARAMETERS

         3.1     Taking into account the Effective Date and Operations Starting
Date under the Agreement, the Parties agree that the initial Maximum Total Fee
(MTF) of US $*/Barrel (* of the United States of America per 


         * Confidential portion has been omitted pursuant to a request for
           confidential treatment and filed separately with the Commission.
 


                                                                               4
 
<PAGE>   92
barrel) set forth on sub clause 18.13 of the Agreement, shall be adjusted in
accordance with the formula contained on the same clause, therefore during the
First Trimester in course shall be the First Trimester of 1994 and the previous
First Trimester shall be the fourth Trimester of 1993.  For the effect of
adjustment for the Incentive in Production Increase of US $*/Barrel (* of the
United States of America per Barrel) set forth on Sub clause 18.17 of the
Agreement, the first Trimester in course shall continue being the first
Trimester of 1993 and the previous first Trimester shall continue being the
fourth Trimester of 1992.  The change made to the Agreement herein was agreed
between the Parties due to commercial and extraordinary causes.  The Parties
agree that the reference dates for the Incentive in Production Increase
aforementioned, shall not be the object of any modification in the future.

         3.2     The provisions set forth on 3.1 herein shall be effective as
of Effective Date of the Agreement.  The remuneration adjustments to THE
CONTRACTOR that shall take place in compliance with this Addendum, shall be
made within thirty (30) days upon reception of the invoice corresponding to the
fourth (4) Trimester of 1994.

4.       SECONDARY RECOVERING PROJECT.

         4.1     THE CONTRACTOR is bound to execute a secondary recovery
project at Marcelina Oil Field, similar to the secondary case referred to in
the August


         * Confidential portion has been omitted pursuant to a request for
           confidential treatment and filed separately with the Commission.
 
                                                                               5

<PAGE>   93
1993 offer rendered to THE SUBSIDIARY, as long as the parties determine that
such project is feasible from the technical and economical point of view for
both Parties.  During the two (2) years following the execution of this
Addendum THE CONTRACTOR agrees to carry out feasibility studies necessary in
order to make a decision on whether or not to proceed with the referred project
on secondary recovery.  In the event such study has been made and the decision
of not to proceed with the referred project on secondary recovery, THE
SUBSIDIARY may request THE CONTRACTOR, when so deemed convenient, that the
above mentioned feasibility studies be updated, updating them and taking the
respective decision, in a term no longer than six (6) months as from the date
the requirement is made in writing to THE SUBSIDIARY.  In the event it is
required, the magnitude of the secondary recovery project shall depend on the
performance of Marcelina oil field and of the results of the pilot project of
water injection that THE CONTRACTOR shall carry out as of the first semester
1995.  The above mentioned secondary recovery project shall be considered
feasible from the economical point of view for THE CONTRACTOR only if the
internal return rate for THE CONTRACTOR is equal or higher to    *    per cent
    *    calculated based on an economic analysis with constant oil prices and
costs not subject to inflation, and at a Product Price Budget equal to the
average of the three (3) Trimesters previous to the date in which the decision
is taken.  In the event the Parties do not reach an agreement in relation to
the technical feasibility of the secondary recovery project the decision shall
be referred to an independent oil 


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



                                                                               6
<PAGE>   94
consulting firm, chosen by mutual consent of the parties. In such case the
professional fees regarding such advise shall be shared by both parties.

         4.2.    The non fulfillment of the obligations herein set forth on
numeral four (4) from the part of THE CONTRACTOR shall be considered as a
substantial non fulfillment of its obligations, as set forth on Clause 5.8.
of the Agreement.

5.       OTHER PROVISIONS

         5.1     The parties agree to modify, according to the present
Addendum, the gravity minimum requirement contained on Attachment "A" of the
Agreement in order to allow the delivery of Crude Oil within a range of 22
degrees to 30 degrees API, with the objective of not limiting the production
and development of Marcelina Oil Field.

         5.2.    The additional activities referred to in this Addendum are
obligatory for THE CONTRACTOR, which shall provide additional amounts that may
result necessary for its execution.  Without prejudice of such obligation, the
amount of the minimum installment referred to in Clauses 5.1 and 5.7 of the
Agreement, shall continue to be US $     *    .oo.

         5.3.    The parties agree to modify, according to the present
Addendum, Sub Clause 6.6 of the Agreement, which shall be drafted as follows:

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                                                               7
<PAGE>   95

"THE CONTRACTOR shall conduct and negotiate on behalf of THE SUBSIDIARY, with
its cooperation and support, the obtantion of any permit and/or right of pass,
and/or right of way to third parties needed so that THE CONTRACTOR reaches the
Agreement Area, or on the premises in order to carry out Operation Services set
forth on the Agreement.  THE CONTRACTOR shall inform THE SUBSIDIARY in writing,
with at least two (2) months of Operation among the Agreement Area in
compliance with the Labor Program.  Subject to the conditions herein set forth,
only the payments made by THE CONTRACTOR to third parties regarding such
permits and rights, duly sustained with their respective vouchers, shall be
recovered by THE CONTRACTOR as Capital Cost.

All payments made by THE CONTRACTOR to third parties as set forth on Sub Clause
6.6, shall be made previous authorization of THE SUBSIDIARY in writing.  THE
SUBSIDIARY, shall communicate in writing and in each case, its approval or
objections within the following fifteen (15) working days upon reception of the
approval request from THE CONTRACTOR. Should THE CONTRACTOR does not receive
written communication from THE SUBSIDIARY, during the above mentioned fifteen
(15) working days term, it shall be understood that such payments have been
authorized.

With the exception of a case of negligence from any of the Parties, any delay
in the Operations Services caused by the delay in the obtation of the terms and




                                                                               8
<PAGE>   96
rights referred to in this sub clause, shall not be considered chargeable to
any of the Parties".

         5.4     The parties agree to modify according to the present Addendum,
sub clause 7.9 of the Agreement, which shall be drafted as follows:

"THE SUBSIDIARY shall cooperate with THE CONTRACTOR and shall support the same,
in order to negotiate and complete those agreements with third parties, land
owners and real estate owners among the Area of the Agreement, required in
order to enter the area or other reasonable rights required by THE CONTRACTOR
in order to carry on with the Operation Services herein.  Such rights granted
by third parties to THE SUBSIDIARY, shall be extended to THE CONTRACTOR for the
duration of this Agreement.  Any other reimbursement or administration costs,
organization and man hour incurred by THE SUBSIDIARY in relation to the
referred support or for the obtainment of the aforementioned rights, shall be
on THE CONTRACTORS account, which shall reimburse them to THE SUBSIDIARY within
the next forty five (45) days upon presentation of vouchers referring those
costs, which in turn shall be recovered by THE CONTRACTOR as Capital Costs".

         5.5     The parties agree to clarify, in accordance with the last
paragraph of Sub clause 18.14 of the Agreement, that the interest referred to
on Sub clauses




                                                                               9
<PAGE>   97
18.7 and 18.12 of the Agreement shall be totally charged to and recovered
during each following trimester, as long as the Maximum Total Fee (MTF) so
permits it.

         5.6     The parties agree, according to the present Addendum, to
clarify Sub clause 18.10 of the Agreement, which shall be drafted as per terms
set forth on Attachment "A" herein, which is part of the same.

         5.7     With the exception of clarifications and amendments to the
Agreement herein made, the Parties ratify and confirm the other terms of the
Agreement.

         5.8     This Addendum shall not amend or modified in any aspect, with
the exception of mutual written consent between the Parties.

In witness thereof the Parties have signed two copies of the same tenor and
sole effect, in the city of Caracas, on December seven (7) 1994.

By THE SUBSIDIARY                      By THE CONTRACTOR

(Signed illegible) By:                 (Signed illegible) By: Carlos del Solar

Emilio Abouhamad -  President          President and General Manager




                                                                              10
<PAGE>   98
                                  ATTACHMENT A

                               OF ADDENDUM No. 1
                                       TO
                  OPERATION SERVICES AGREEMENT FOR UNIT D.Z.O.

In accordance with what is set forth on Article 5.6 of the Addendum, THE
SUBSIDIARY and THE CONTRACTOR agree to clarify the terms contained on clause
18.10, which shall be drafted as follows:

"18.10  All cost of THE CONTRACTOR, different to Capital Costs and Non
Capitalized Costs previous to the Production Date, included with no limitation,
operations costs and THE CONTRACTOR'S services fees, may be recovered only
through Operations Fee (OPFee).

OPFee shall be subject to adjustments after the Trimester which includes the
Effective Date of this Agreement as follows:

As of the following Trimester of that which includes the Effective Date of the
Agreement the "US$/Barrel OPFee of THE CONTRACTOR shall be adjusted on a
trimester basis due to inflation, in which manner the OPFee in each Following
Trimester reflects the adjusted value.

The formula US$/Barrel OPFee adjusted due to inflation shall be determined in
accordance with the following formula:

                                            *

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.

                                                                              11
<PAGE>   99
*

The procedures above described shall be applied subsequently to the Effective
date of this Agreement.

The above resulting amount of OPFee (N) shall be applied to the three following
formulas.

The OPFee shall be calculated according to the Crude Oil Production delivered
to THE SUBSIDIARY.

Formula 1:       Should the Crude Oil Production volume delivered to THE
                 SUBSIDIARY is              *                .

Formula 2:       Should the Crude Oil Production volume delivered to THE
                 SUBSIDIARY is     *      , the OPFee shall be calculated
                 as per the following formula:

                 *

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                                                              12
<PAGE>   100
Formula 3:       Should the Crude Oil Production Volume delivered to THE
                 SUBSIDIARY is higher than Po, the OPFee shall be calculated as
                 per the following formula:

                    *
                    *

(*) The applicable inflation index in order to determine OPFee (N) adjusted to
any Trimester after the Trimester containing the Effective Date of this
Agreement shall be the Special Index Energy (unadjusted) from the Consumer
Price Index for all Urban Consumers (CPI-U), United States City Average (base
period 1982 - 1984 = 100) from the Summary Data from the 

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                                                              13
<PAGE>   101
Consumer Price Index News Release as published monthly by the United States
Department of Labor Statistics, Washington DC 20212.

Should the Inflation Index, as indicated monthly in News Release above
described suffers corrections at any time after its publication and use for the
adjustments of OPFee (N), the acceptable reconciliation shall be applied in the
following Trimester.

Should the index for the base period (1982 - 1984 = 100) is revised it must be
clear that the intention of this indention provision is made in order to adjust
in proportion the OPFee (N) to the average of price level of IV Trimester 93 in
the Trimester invoiced using the information of three months of the Trimesters
in course and the Information of the three months of the IV Trimester 93":

The foregoing is a faithful translation of the attached document written in
Spanish, which I have made upon request of the interested, not prejudging about
content or form, in Marcaibo, State of Zulia, Republic of Venezuela on November
10th 1997.

/s/ MARIA ISABEL MARTINEZ GARCIA

Maria Isabel Martinez Garcia
Certified Translator for the English Language



                                                                              14

<PAGE>   1
<TABLE>
<CAPTION>

[NATIONSBANK LOGO]               Note#               Acct#               PROMISSORY NOTE
NationsBank of Texas, N.A.                                              (Single Maturity)
=========================================================================================
<S>                                                 <C>                <C>
Name and Address of Lender (Including County)       Officer            Date
NationsBank of Texas, N.A.                          Paul A. Squires    February 4, 1998
700 Louisiana                                       -------------------------------------
Houston, Texas 77002                                Maturity Date      Amount of Note
                                                    May 4, 1998        $130,000,000.00
                                                    -------------------------------------
                                                                                                      
                                                                      [ ] 1. Fixed Rate of      %, or
                                                    Annual Rate       [ ] 2. Lender's Business Base Rate plus    %, or
                                                    of Interest (AR): [ ] 3. Lenders Prime Rate plus      %, or
                                                    (Check and        [X] 4. See Below*
                                                    Complete one) 
                                                    ---------------------------------------------------------------------

                                                    AR Computed Using

                                                    360/360 Days per Year
                                                    ---------------------------------------------------------------------



</TABLE>

Terms used in this Note shall have the meanings indicated herein and in the
boxes above. On demand, or if prior demand is not made then on Maturity Date,
Maker promises to pay to the order of Lender at Lender's address shown above
the Amount of Note plus interest on unpaid Amount of Note from Date at the AR
over the elapsed term of Note provided that the amount of interest payable
shall not exceed the maximum amount Lender lawfully may charge on this Note. If
the AR is stated in terms of Lender's Business Base Rate, Lender's Prime Rate,
or such other variable Rate described under the * below, the AR shall change
with each change in such named Rate as of the date of any such change without
notice. "Lender's Business Base Rate" shall mean the Business Base Rate charged
by Lender as announced or published by Lender from time to time. "Lender's
Prime Rate" shall mean the Prime Interest Rate charged by Lender as announced
or published by Lender from time to time. The two rates may not be related and
either may not be the lowest interest rate charged by Lender. Unpaid and past
due Amount of Note and interest shall bear interest at the highest rate Lender
lawfully may charge on this Note. Interest paid or agreed to be paid shall not
exceed the maximum amount permissible under applicable law and, in any
contingency whatsoever, if Lender shall receive anything of value deemed
interest under applicable law which would exceed the maximum amount of interest
permissible under applicable law, the excessive interest shall be applied to
the reduction of the unpaid Amount of Note or refunded to Maker.

Each Maker, guarantor, surety and endorser waives demand, presentment, notice of
dishonor, protest, notice of intent to accelerate, notice of acceleration and
diligence in collecting sums due hereunder; agrees to application of any debt of
Lender to the payment hereof; agrees that extensions and renewals without limit
as to number, acceptance of any number of partial payments, releases of any
party liable hereon, and releases or substitutions of collateral, before or 
after maturity, shall not release or discharge his obligation under this Note;
and agrees to pay in addition to all other sums due hereunder reasonable
attorney's fees if this Note is placed in the hands of an attorney for
collection or if it is collected through probate, bankruptcy, or other judicial
proceeding, plus all court costs and other collection expenses incurred by
Lender. As used herein, where appropriate, the masculine gender includes the
feminine and neuter and the singular number includes the plural. All payments
hereunder shall be made in lawful tender of the United States of America. This
Note is executed in the county and state stated above.

*In accordance with the Letter Agreement between Borrower and Lender dated
February 4, 1998.



                                   Compania Occidental de Hidrocarburos, Inc.
                                           
                                   By: LUIS H. DERROTA 
                                      ----------------------------------------
                                   Title: Vice President & Assistant Secretary
                                         -------------------------------------
                                   Compania Occidental de Hidrocarburos, Inc.
                                   -------------------------------------------
                                   (Maker)

[Compania Occidental de Hidrocarburos,Inc.] 
<PAGE>   2
                                                                    CONFIDENTIAL






                                February 4, 1998

Compania Occidental de Hidrocarburos, Inc.
c/o Union Texas Petroleum Holdings, Inc.
1330 Post Oak Blvd.
P.O. Box 2120
Houston, Texas 77252-2120

     Re:  $130,000,000 Loan

Gentlemen:

NationsBank of Texas, N.A. ("NationsBank") has been requested to make a loan in
the amount of $130,000,000 to Compania Occidental de Hidrocarburos, Inc., a
corporation organized under the laws of California ("Borrower") in a single
advance on the date hereof.  NationsBank has agreed to make the Loan upon the
following terms and conditions:

1.   The Loan shall be evidenced by a Promissory Note in the form of Exhibit A
     attached hereto (the "Note").

2.   The Loan shall mature and, together with accrued interest, be payable in
     full on May 4, 1998.  The Loan shall bear interest at the Borrower's
     election at (i) a rate equal to the rate (computed on the basis of a year
     of 360 days for the actual number of days elapsed, including the first day
     but excluding the last day) determined by NationsBank at which deposits are
     offered by NationsBank in the London Interbank Eurodollar Market two
     business days prior to the date of the Loan for a one-month period in an
     amount substantially equal to the Loan plus 50 basis points (the "LIBOR
     Rate") or (ii) for terms of 7 days or less a fixed rate of interest
     mutually agreed to between the Borrower and NationsBank.  If a fixed rate
     is not agreed to between the Borrower and NationsBank as provided for above
     and any existing interest period has lapsed, the Loan shall bear interest
     at a one-month LIBOR Rate (including the 50 basis point margin) set two
     business days prior to the end of such expiring one-month period.

3.   The Loan shall not be subject to optional prepayment by Borrower.
<PAGE>   3

Compania Occidental de Hidrocarburos, Inc.
February 4, 1998
Page 2


4.   It shall be an Event of Default under this letter agreement and the Note in
     the event Borrower fails to pay the principal of or accrued interest on the
     Loan when due or upon the occurrence of an Event of Default as defined in
     that certain Second Amended and Restated Credit Agreement dated as of March
     29, 1996 (as heretofore amended or modified, the "Credit Agreement") among
     the Guarantor, the lenders party thereto, NationsBank, as Agent, and Bank
     of America National Trust and Savings Association and Union Bank of
     Switzerland, Houston Agency, as Co-Agents.

5.   Borrower hereby represents and warrants to NationsBank as follows

               i.   The Borrower is a corporation duly organized, validly
     existing, and in good standing under the laws of the State of California.
     The Borrower is duly qualified and authorized to do business and is in good
     standing in California.

               ii.  The Borrower has all corporate power, permits and other
     authorizations required to own and operate its properties and to carry on
     its business as now conducted by it.

               iii. The execution and delivery of this Agreement and the Note,
     the consummation of the transactions and the execution and delivery of the
     instruments contemplated hereby, and the fulfillment of the terms and
     compliance with the provisions hereof and thereof will not result in any
     violation or breach of any provisions of, or constitute a default under,
     the Borrower's Certificate of Incorporation or bylaws.

6.   As a condition precedent to NationsBank agreeing to make the Loan to
     Borrower, Union Texas Petroleum Holdings, Inc. shall agree to guaranty the
     Loan and shall cause its duly authorized representatives to execute a
     Guaranty Agreement in substantially the form of Exhibit B attached hereto
     to NationsBank, together with such authorizing resolutions and certificates
     of incumbency and specimen signatures of the signing officers as
     NationsBank may reasonably request.

7.   THE WRITTEN LOAN AGREEMENT AND THE NOTE REPRESENT THE FINAL AGREEMENT
     BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
     CONTEMPORANEOUS, OR
<PAGE>   4
Compania Occidental de Hidrocarburos, Inc.
February 4, 1998
Page 3



     SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL
     AGREEMENTS BETWEEN THE PARTIES.

Very truly yours,



NATIONSBANK OF TEXAS, N.A.



By:    /s/ PAUL SQUIRES
   ------------------------------------
      Title:  Senior Vice President
             --------------------------
<PAGE>   5
Compania Occidental de Hidrocarburos, Inc.
February 4, 1998
Page 4



ACCEPTED AND AGREED TO:

COMPANIA OCCIDENTAL DE HIDROCARBUROS, INC.



By:    /s/ LUIS H. DERROTA
   -------------------------------
     Title:  Vice President and
            ----------------------
             Assistant Secretary
            ----------------------
<PAGE>   6
                                                                       Exhibit B


                               GUARANTY AGREEMENT



     GUARANTY dated as of February 4, 1998 ("Agreement") between Union Texas
Petroleum Holdings, Inc. (the "Guarantor") and NationsBank of Texas, N.A. (the
"Lender").

                                  WITNESSETH:

     WHEREAS, pursuant to a letter agreement dated as of February 4, 1998 (the
"Letter Agreement") between Compania Occidental de Hidrocarburos, Inc. (the
"Company") and the Lender, the Company is entitled, subject to certain
conditions, to borrow up to $130,000,000;

     WHEREAS, as a condition to borrowing under the Letter Agreement and the
Note referred to therein (the "Note"), the Guarantor is required to execute and
deliver this Agreement whereby the Guarantor shall guarantee the payment when
due of the principal of and interest on the loan evidenced by the Note and all
other amounts payable at any time by the Company or the Guarantor under the
Letter Agreement, the Note or this Agreement (collectively, the "Interim
Financing Documents") including, without limitation, interest which accrues
during a proceeding which occurs under the U.S. Bankruptcy Code or which would
otherwise accrue on such amount under the terms of the Letter Agreement and the
Note, but for a proceeding under the U.S. Bankruptcy Code (such principal,
interest and other amounts being herein called the "Guaranteed Amount");

     WHEREAS, in consideration of such financial and other support as the
Company may in the future provide, to the Guarantor and in order to induce the
Lender to enter into the Letter Agreement and to make the loan contemplated
thereby, the Guarantor is willing to guarantee the Guaranteed Amounts;

     NOW, THEREFORE, the parties hereto agree as follows:

                                   ARTICLE 1
                                  DEFINITIONS

     SECTION 1.01. Definitions. Terms defined in the Letter Agreement and not
otherwise defined herein are used as therein defined.

<PAGE>   7
                                   ARTICLE II
                                   GUARANTEES


     SECTION 2.01. The Guaranty. The Guarantor hereby unconditionally and
irrevocably guarantees to the Lender the full and punctual payment of all
present and future Guaranteed Amounts as and when the same shall become due and
payable, whether at maturity, by declaration or otherwise, according to the
terms thereof.  In case of failure by the Company punctually to pay any
Guaranteed Amount, the Guarantor agrees upon demand by the Lender, to make
payment thereof to the Lender at the place and in the manner specified in the
Letter Agreement.

     SECTION 2.02. Guaranty Unconditional. The obligations of the Guarantor
under this Article II shall be unconditional and absolute and, without limiting
the generality of the foregoing, shall not be released, discharged or otherwise
affected by:

          (a)  any extension, renewal, settlement, compromise, waiver or
release in respect of any obligation of the Company under any Interim Financing
Document or any Guaranteed Amount;

          (b)  any modification or amendment of or supplement to (i) this
Agreement insofar as the same does not purport to modify the rights or
obligations of the Guarantor hereunder or (ii) any other Interim Financing
Document;

          (c)  any change in the corporate existence, structure or ownership of
the Company or the Guarantor, or any insolvency, bankruptcy, reorganization or
other similar proceeding affecting the Company or the Guarantor or their
respective assets;

          (d)  the existence of any claim, set-off or other rights which the
Guarantor may have at any time against the Company, the Lender or any other
person or entity, whether or not arising in connection with any Interim
Financing Document or any Guaranteed Amount, provided that nothing herein shall
prevent the assertion of any such claim by separate suit or compulsory
counterclaim;

          (e)  any invalidity or unenforceability relating to or against the
Company or the Guarantor for any reason of any Interim Financing Document or
any Guaranteed Amount, or any provision of applicable law or regulation
purporting to prohibit the payment by the Company or the Guarantor of any
Guaranteed Amount; or

          (f)  any other act or omission to act or delay of any kind by the
Company or the Guarantor, the Lender or any other person or entity or any other
circumstances whatsoever that

                                      -2-
<PAGE>   8


might, but for the provisions of this paragraph, constitute a legal or equitable
discharge of the obligations of the Guarantor under this Article II.

     SECTION 2.03.  Discharge Reinstatement in Certain Circumstances. The
Guarantor's obligations under this Article II shall remain in full force and
effect until all of the Guaranteed Amounts shall have been paid in full. If at
any time any payment of or any amount payable by the Company or the Guarantor in
respect of any Guaranteed Amount is rescinded or must be otherwise restored or
returned upon the insolvency, bankruptcy or reorganization of such Person or
otherwise, the Guarantor's obligations under this Article II with respect to
such payment shall be reinstated at such time as thought such payment had become
due but had not been made at such time.

     SECTION 2.04.  Waiver. The Guarantor irrevocably waives acceptance hereof,
presentment, demand, protest and any notice not provided for herein, as well as
any requirement that at any time any action be taken by any person or entity
against the Company or the Guarantor or any other person or entity. The
Guarantor hereby irrevocably waives each and every right to which it may be
entitled by virtue of the suretyship laws of the State of Texas, including,
without limitation, any and all rights it may have pursuant to Rule 31 or Rule
32, Texas Rules of Civil Procedure, Section 17.001 of the Texas Civil Practice
and Remedies Code and Chapter 34 of the Texas Business and Commerce Code.

     SECTION 2.05.  Subrogation and Contribution. The Guarantor irrevocably
waives any and all rights to which it may be entitled, by operation of law or
otherwise, upon making any payment hereunder (i) to be subrogated to the rights
of the payee against the Company with respect to such payment or otherwise to be
reimbursed, indemnified or exonerated by the Company in respect thereof or (ii)
to receive any payment, in the nature of contribution or for any other reason,
from any other person with respect to such payment, in each case until such time
as all of the Guaranteed Amounts shall have been paid in full.

     SECTION 2.06. Stay of Acceleration. If acceleration of the time for
payment of any amount payable by the Company in respect of any Guaranteed Amount
is stayed upon the insolvency, bankruptcy or reorganization of such entity, all
such amounts otherwise subject to acceleration under the terms of the Interim
Financing Documents or any other agreement or instrument evidencing such
Guaranteed Amount shall nonetheless be payable by the Guarantor hereunder
forthwith on demand by the Lender.

     SECTION 2.07. Existing Credit Agreement. Guarantor will maintain borrowing
availability under that certain Second Amended and Restated Credit Agreement
dated as of March 29, 1996 (as heretofore amended or modified, the "Credit
Agreement") among the Guarantor, the lenders party thereto, NationsBank, as
agent, Bank of America National Trust and Savings and Union Bank of




                                      -3-
<PAGE>   9
Switzerland, Houston Agency, as Co-Agents in an amount not less than the
principal balance of the Guaranteed Amount.

     SECTION 2.08. Representations and Warranties. The Guarantor represents and
warrants that as of the date hereof, and after giving effect to this Agreement
and the contingent obligations evidenced hereby (i) it is and will be solvent,
and has and will have assets which, fairly valued, exceed its obligations,
liabilities and debts, and has and will have property and assets sufficient to
satisfy and repay its obligations, liabilities and debts when the same become
due and (ii) the representations and warranties set forth in the Credit
Agreement are true on the date hereof as if made on the date hereof.


                                  ARTICLE III
                                 MISCELLANEOUS

     SECTION 3.01. Notices. All notices, requests and other communications to
any party hereunder shall be in writing (including telecopy, telex, facsimile
transmission or similar writing) and (i) in the case of the Guarantor, shall be
given to the Guarantor at Union Texas Petroleum Holdings, Inc., 1330 Post Oak
Boulevard, Houston, Texas 77056 (telex number:  762255) and (ii) in the case of
the Company or the Lender, at its address specified in the Letter Agreement or
in any case at such other address or telex number as such party may hereafter
specify for the purpose by notice to the Lender and the Company.  Each such
notice, request or other communication shall be effective (i) if given by
telex, when such telex is transmitted to the telex number specified in this
Section and the appropriate answer is received, (ii) if given by mail, 72 hours
after such communication is deposited in the mails with first class postage
prepaid, addressed as aforesaid or (iii) if given by any other means, when
delivered at the address specified in this Section.

     SECTION 3.02. No Waiver; Exercise of Remedies. No failure or delay by the
Lender in exercising any right, power or privilege hereunder shall operate as a
waiver thereof nor shall any single or partial exercise thereof preclude any
other or further exercise thereof or the exercise of any other right, power or
privilege. The rights and remedies herein provided shall be cumulative and not
exclusive of any rights or remedies provided by law.

     SECTION 3.03. Amendments and Waivers. Any provision of this Agreement may
be amended or waived, and the Guarantor may be released from any of its
obligations hereunder, if and only if, such amendment, waiver or release is in
writing and is signed by the Lender.

     SECTION 3.04. Texas Law. This Agreement shall be construed in accordance
with and governed by the law of the state of Texas.



                                      -4-
<PAGE>   10
     SECTION 3.05. CONSENT TO JURISDICTION. THE GUARANTOR HEREBY IRREVOCABLY
CONSENTS TO THE NONEXCLUSIVE JURISDICTION OF THE COURTS OF THE STATE OF TEXAS
AND OF ANY FEDERAL COURT LOCATED IN SUCH STATE OVER EACH OF THEM IN CONNECTION
WITH ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO ANY INTERIM
FINANCING DOCUMENT AND, TO THE FULLEST EXTENT PERMITTED BY LAW, FURTHER AGREES
(AND SHALL NOT CONTEST) THAT THE PROPER VENUE FOR FILING AND MAINTAINING ANY
SUCH ACTION OR PROCEEDING SHALL BE IN THE STATE OF TEXAS. IN ANY SUCH ACTION OR
PROCEEDING, THE GUARANTOR WAIVES PERSONAL SERVICE OF ANY SUMMONS, COMPLAINT OR
OTHER PROCESS OR NOTICE AND AGREES THAT SERVICE BY FIRST CLASS MAIL, RETURN
RECEIPT REQUESTED, TO THE GUARANTOR AT ITS ADDRESS FOR NOTICES HEREUNDER, OR
ANY OTHER FORM OF SERVICE PROVIDED FOR IN THE TEXAS CIVIL PRACTICE LAW AND RULES
THEN IN EFFECT SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE UPON THE GUARANTOR.

     SECTION 3.06. WAIVER OF JURY TRIAL. THE GUARANTOR HEREBY IRREVOCABLY
WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT
OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

     SECTION 3.07. WAIVER OF SOVEREIGN IMMUNITY. TO THE EXTENT THAT THE
GUARANTOR HAS OR HEREAFTER MAY ACQUIRE ANY IMMUNITY FROM JURISDICTION OF ANY
COURT OR FROM ANY LEGAL PROCESS (WHETHER THROUGH SERVICE OR NOTICE, ATTACHMENT
PRIOR TO JUDGMENT, ATTACHMENT IN AID OF EXECUTION, EXECUTION OR OTHERWISE) WITH
RESPECT TO ITSELF OR ITS PROPERTY, THE GUARANTOR HEREBY IRREVOCABLY WAIVES, TO
THE FULLEST EXTENT IT MAY LEGALLY DO SO, SUCH IMMUNITY IN RESPECT OF ITS
OBLIGATIONS UNDER THIS AGREEMENT AND, WITHOUT LIMITING THE GENERALITY OF THE
FOREGOING, AGREES, TO THE FULLEST EXTENT IT MAY LEGALLY DO SO, THAT THE WAIVERS
SET FORTH IN THIS SECTION 3.07 SHALL HAVE THE FULLEST SCOPE PERMITTED UNDER THE
FOREIGN SOVEREIGN IMMUNITIES ACT OF 1976 OF THE UNITED STATES AND ARE INTENDED
TO BE IRREVOCABLE FOR PURPOSES OF SUCH ACT.

     SECTION 3.08. Successors and Assigns. All of the provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns, except that the Guarantor may not
assign or transfer any of its rights or obligations under this Agreement.


                                      -5-
<PAGE>   11
         SECTION 3.09  Counterparts.  This Agreement may be signed in any number
of counterparts, each of which shall be an original, and all of which taken
together shall constitute a single instrument, with the same effect as if the
signatures thereto and hereto were upon the same instrument.



                                      -6-
<PAGE>   12
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed by their respective authorized officers as of the date first
above written.

                                    GUARANTOR:

                                    UNION TEXAS PETROLEUM HOLDINGS, INC.



                                    By: /s/ M. N. Markowitz
                                        ----------------------------
                                        Title: Vice President and 
                                               Treasurer 
                                              ----------------------


                                    LENDER:

                                    NATIONSBANK OF TEXAS, N.A.


                                    By: /s/ PAUL SQUIRES
                                        ----------------------------
                                        TITLE: Senior Vice President
                                              ----------------------


                                      -7-

<PAGE>   1
                              FOURTH AMENDMENT TO
                             UNION TEXAS PETROLEUM
                        SALARIED EMPLOYEES' PENSION PLAN

         WHEREAS, Union Texas Petroleum Holdings, Inc. (the "Company") and
other Employing Companies have heretofore adopted and maintain the Union Texas
Petroleum Salaried Employees' Pension Plan as amended and restated effective
January 1, 1994 (the "Plan") for the benefit of their eligible employees; and

         WHEREAS, Union Texas Venezuela, Limited has agreed to purchase all of
the stock of Compania Occidental de Hidrocarburos, Inc. from Occidental Oil and
Gas Corporation (the "Stock Purchase"); and

         WHEREAS, upon consummation of the Stock Purchase the Company or
subsidiaries of the Company will offer employment to certain individuals
currently employed by Occidental Oil and Gas Corporation or its affiliates
other than Compania Occidental de Hidrocarburos, Inc.; and

         WHEREAS, the Company desires to amend the Plan in certain respects as
to the benefits of individuals who transfer employment from Occidental Oil and
Gas Corporation or its affiliates other than Compania Occidental de
Hidrocarburos, Inc. to the Company or one of its subsidiaries in connection
with the Stock Purchase (the "Occidental Transferred Employees");

         NOW, THEREFORE, the Plan is hereby amended as follows:

         1. Effective as of the closing date of the Stock Purchase, the Plan is
hereby amended to provide that the Occidental Transferred Employees who
transfer employment to the Company or one of its subsidiaries at the closing
date of the Stock Purchase or within 60 days after such closing date and who
are eligible to participate in the Plan shall be credited for vesting purposes
under the Plan with all service such employees were credited with by Occidental
Oil and Gas Corporation, provided, however, that such Occidental Transferred
Employees shall not be credited with Accrual Service under the Plan (whether
pursuant to Section 4.01(b) of the Plan or otherwise) for such vesting service.

         2. The terms used in this document with initial capitalization shall
have the same meaning as are ascribed to such terms under the Plan, except as
otherwise specifically indicated herein.

         3. As amended hereby, the Plan is specifically ratified and
reaffirmed.

                                        UNION TEXAS PETROLEUM HOLDINGS, INC.


                                        By: /s/ JOHN L. WHITMIRE
                                            ------------------------------------
                                            John L. Whitmire
                                            Chairman and Chief Executive Officer

<PAGE>   1
                              FOURTH AMENDMENT TO
                         UNION TEXAS PETROLEUM SAVINGS
                          PLAN FOR SALARIED EMPLOYEES

         WHEREAS, Union Texas Petroleum Holdings, Inc. (the "Company") and
other Employing Companies have heretofore adopted and maintain the Union Texas
Petroleum Savings Plan for Salaried Employees as amended and restated effective
January 1, 1993 (the "Plan") for the benefit of their eligible employees; and

         WHEREAS, Union Texas Venezuela, Limited has agreed to purchase all of
the stock of Compania Occidental de Hidrocarburos, Inc. from Occidental Oil and
Gas Corporation (the "Stock Purchase"); and

         WHEREAS, upon consummation of the Stock Purchase the Company or
subsidiaries of the Company will offer employment to certain individuals
currently employed by Occidental Oil and Gas Corporation or its affiliates
other than Compania Occidental De Hidrocarburos, Inc.; and

         WHEREAS, the Company desires to amend the Plan in certain respects as
to the benefits of individuals who transfer employment from Occidental Oil and
Gas Corporation or its affiliates other than Compania Occidental de
Hidrocarburos, Inc. to the Company or one of its subsidiaries in connection
with the Stock Purchase (the "Occidental Transferred Employees");

         NOW, THEREFORE, the Plan is hereby amended as follows:

         1. Effective as of the closing date of the Stock Purchase, the Plan is
hereby amended to provide that the Occidental Transferred Employees who
transfer employment to the Company or one of its subsidiaries at the closing
date of the Stock Purchase or within 60 days after such closing date and who
are eligible to participate in the Plan shall be credited for vesting purposes
under the Plan with all service such employees were credited with by Occidental
Oil and Gas Corporation.

         2. The terms used in this document with initial capitalization shall
have the same meaning as are ascribed to such terms under the Plan, except as
otherwise specifically indicated herein.

         3. As amended hereby, the Plan is specifically ratified and
reaffirmed.

                                        UNION TEXAS PETROLEUM HOLDINGS, INC.


                                        By: /s/ JOHN L. WHITMIRE
                                            ------------------------------------
                                            John L. Whitmire
                                            Chairman and Chief Executive Officer



<PAGE>   1
                             UNION TEXAS PETROLEUM

                           DEFERRED COMPENSATION PLAN














                            As Amended and Restated
                           Effective February 4, 1998





<PAGE>   2



                             UNION TEXAS PETROLEUM

                           DEFERRED COMPENSATION PLAN

<TABLE>
<CAPTION>
                                                                                                             Page
                                                                                                             ----
<S>               <C>                                                                                         <C>
Section 1         Definitions ............................................................................     2

Section 2         Administration .........................................................................     5

Section 3         Participants ...........................................................................     6

Section 4         Deferrals ..............................................................................     6

Section 5         General Provisions .....................................................................    12
</TABLE>




                                      -i-

<PAGE>   3

                             UNION TEXAS PETROLEUM
                           DEFERRED COMPENSATION PLAN
                                    PREAMBLE

                  WHEREAS, to assist the ability of Union Texas Petroleum
Holdings, Inc. (the "Company") to attract and retain exceptional key employees
and individuals to serve on its Board of Directors, the Company has heretofore
adopted on May 9, 1997 the Union Texas Deferred Compensation Plan (the "Plan")
which permits those persons the ability to defer compensation on an elective
basis;
                  WHEREAS, the Company desires to align more closely the
interests of those eligible individuals electing to the defer compensation with
the interests of the stockholders of the Company by permitting certain
deferrals to be in the form of restricted shares of common stock of the Company
or in phantom shares of common stock of the Company; and

                  WHEREAS, the Company desires to amend the Plan in several
respects as provided herein;

                  NOW, THEREFORE, the Plan is hereby amended and restated in
its entirety as follows, effective February 4, 1998; provided, however, this
amendment and restatement shall not operate or be construed to adversely affect
or change any Participant elections previously made under the Plan.


<PAGE>   4



                                   SECTION 1

                                  DEFINITIONS

                  For purposes of the Plan, the following terms shall have the
meanings indicated:

         1.1      Account means a ledger account established for a Participant.

         1.2      Affiliate means (i) an entity that, directly or through one or
more intermediaries, is controlled by the Company and (ii) any entity in which
the Company has a significant equity interest, as determined by the Committee.

         1.3      Annual Incentive Compensation means the annual incentive bonus
payable to a Participant with respect to any year, to the extent such bonus is
otherwise earned.

         1.4      Base Compensation means the Participant's base salary payable
for the applicable year or the remainder of the applicable year, as the case
may be, exclusive of all other items of compensation.

         1.5      Beneficiary means the person(s) designated by a Participant,
on a form provided by and filed with the Company's Human Resources Department,
to receive payment by the Employer pursuant to the Plan in the event of his or
her death. A Participant may change his or her beneficiary designation at any
time. If no designated Beneficiary survives the Participant, the Beneficiary
shall be the Participant's surviving spouse or, if none, his or her estate.

         1.6      Board means the Board of Directors of the Company.

         1.7      Cause means the Employee's engaging in fraud, misappropriation
of property of the Employer or willful misconduct damaging to such property or
business of the Employer or a Director removed with cause at a meeting of the
stockholders pursuant to the Bylaws of the Employer.



                                      -2-

<PAGE>   5



         1.8      Change in Control means a Change in Control as defined in
Section 8 of the Company's 1994 Incentive Plan, as amended from time to time.

         1.9      Common Stock means the common stock, par value $.05 per share,
of the Company.

         1.10     Committee means the Organization and Compensation Committee of
the Board or, when it is necessary or desirable, the Section 16 Committee, as
defined in the Company's 1994 Incentive Plan, as amended from time to time.

         1.11     Designated Payment Date means the date on which all or part of
an Account is to be paid to a Participant (or Beneficiary) pursuant to the
Participant's deferral election.

         1.12     Director means a member of the Board who is not also an
employee of the Employer or an Affiliate.

         1.13     Director Fees means the Director's annual retainer for such
year and any meeting fees for each regular and special meeting and any
committee meeting attended by the Director during the applicable year.

         1.14     Employee means an employee of the Employer, including any
Officer, in salary grade 15 of the Company (or its equivalent) or above.

         1.15     Employer means the Company and its Affiliates; provided,
however, as used with respect to any specified Participant, it shall mean the
employing entity of such Participant.

         1.16     Executive means an Employee, including any Officer, in salary
grade 17 of the Company (or its equivalent) or above.

         1.17     Fair Market Value means, if the shares of Common Stock are
traded on a national stock exchange, the fair market value of a share of Common
Stock on the particular date shall be equal to the average of the reported high
and low sales prices of the share of Common Stock on such



                                      -3-

<PAGE>   6



exchange on that date, or if no prices are reported on that date, on the last
preceding date on which such prices of the shares are so reported. If the
shares of Common Stock are publicly traded but are not traded on a national
stock exchange at the time a determination of its fair market value is required
to be made hereunder, its fair market value shall be deemed to be equal to the
average between the closing bid and asked price of the share on the most recent
date the shares were publicly traded. In the event the shares are not publicly
traded at the time a determination of its fair market value is required to be
made hereunder, the determination of fair market value shall be made in good
faith by the Committee.

         1.18     Interest Account means a subaccount of an Account that is
credited with interest periodically at such times and rates as may be
established from time to time by the Committee (or its designee) in its sole
discretion.

         1.19     Investment Account means the Phantom Stock Account, Mutual
Fund Account and Interest Account, as applicable.

         1.20     Mutual Fund Account means a subaccount of an Account that is
credited with phantom units in one or more of the mutual funds listed on
Attachment A hereto.

         1.21     Officer means an Employee who is an officer of the Company who
is subject to Section 16(b) of the Securities Exchange Act of 1934, as amended.

         1.22     Participant means each Employee and Director who participates
in the Plan.

         1.23     Permanent Disability means (i) with respect to an Employee of
the Employer of any Affiliate, becoming permanently disabled under the
standards of the Employer's or Affiliate's disability program as determined by
the Committee or (ii) with respect to a Director, the inability to perform the
duties and services as a director of the Company by reason of a medically



                                      -4-

<PAGE>   7



determinable physical or mental impairment supported by medical evidence which
in the opinion of the Committee can be expected to result in death or which can
be expected to last for a continuous period of not less than 12 months.

         1.24     Phantom Stock means a notional share of Common Stock.

         1.25     Phantom Stock Account means a subaccount of an Account that is
credited with shares of Phantom Stock.

         1.26     Plan means the Union Texas Petroleum Deferred Compensation
Plan as amended from time to time.

         1.27     Restricted Stock means a share of Common Stock that is subject
to restrictions on transfer and a substantial risk of forfeiture for purposes
of Section 83 of the Internal Revenue Code, as amended; provided, however,
shares of Restricted Stock may be surrendered to the Employer as provided in
Section 5.3 of the Plan.

         1.28     Termination means an Employee's termination of employment with
the Company and its Affiliates or a Director's ceasing to be a member of the
Board, whichever is applicable.

                                   SECTION 2

                                 ADMINISTRATION

         2.1      Committee. The Plan shall be administered by the Committee.
The Committee shall have the complete authority and power to interpret the
Plan, prescribe, amend and rescind rules relating to its administration,
determine a Participant's (or Beneficiary's) right to a payment and the amount
of such payment, and to take all other actions necessary or desirable for the
administration of the Plan. The Committee may delegate the ministerial duties
under the Plan to other parties who may or may not be employees of the Company.
All actions and decisions of the Committee shall



                                      -5-

<PAGE>   8



be final and binding upon all Participants and Beneficiaries. No member of the
Committee shall vote on any matter that pertains solely to himself or herself.

                  Notwithstanding the foregoing, the Section 16 Committee shall
have full power and authority to take any of the actions described above and
any other action necessary or desirable to ensure compliance with the
requirements of, and to provide the exemption of transactions under the Plan
pursuant to, Section 16 of the Securities Exchange Act of 1934, as amended, and
the rules and regulations promulgated thereunder.

                                   SECTION 3

                                  PARTICIPANTS

         3.1      Participants. Each Officer, Employee and Director shall be
eligible to participate in the Plan as provided herein; provided, however,
notwithstanding the foregoing, the Committee may specify that one or more
Employees shall be ineligible to participate in the Plan or in a specified
feature of the Plan if the Committee determines, in its sole discretion, that
participation by such designated Employee(s) may cause the Plan to cease to be
a "top-hat" plan for purposes of Employee Retirement Income Security Act of
1974, as amended.

                                   SECTION 4

                                   DEFERRALS

         4.1      Base Compensation Deferrals. Before the beginning of any
future calendar quarter of any year (or, with respect to an Executive who first
becomes eligible to participate during a year, on or before the date on which
the Executive becomes eligible to begin participating), each Executive may
elect to have a designated percentage (in increments of 10%, but not exceeding
50%)



                                      -6-

<PAGE>   9



of his or her Base Compensation for that year (or, his or her Base Compensation
for the remainder of such year, as the case may be) deferred in an Account
under the Plan; provided, however, in no event shall a Participant's deferral
election be given effect with respect to any pay period to the extent it would
reduce the amount of base salary that is to be paid to the Participant to less
than the amount of such Participant's voluntary payroll deductions (other than
deferrals under any other nonqualified deferred compensation plan of the
Employer) for that pay period, including, but not limited to, premiums for
insurance coverages, flexible spending account amounts, employee qualified plan
contributions, government savings bonds, charitable contributions, payments on
loans, and bank account deposits, and applicable taxes required to be withheld
by the Company. The Participant's election shall be made on a form approved by
the Company, which shall govern the amount deferred, the timing of the payment
of the Account, and the investment of the Account during such deferral period
pending its payment by the Employer. A Participant's deferral election
hereunder (i) may be revoked or changed only as of the beginning of a future
calendar quarter and (ii) shall apply only with respect to the Base
Compensation earned during that specified calendar year or partial year, as the
case may be.

         4.2      Annual Incentive Compensation Deferrals. Before October 1 of
any year, each Employee for that year may elect to have all or a designated
percentage (in increments of 25%) of his or her Annual Incentive Compensation
that may become earned with respect to that year deferred in an Account under
the Plan until a future date or dates as specified by the Participant. The
Participant's election shall be irrevocable and shall be made on a form
prescribed by the Company, which shall govern the amount deferred, the timing
of the payment of the Account, and the investment of the Account during such
deferral period pending its payment by the Employer. A



                                      -7-

<PAGE>   10



Participant's deferral election hereunder shall apply only to the Annual
Incentive Compensation earned, if any, with respect to the specified calendar
year.

         4.3      Restricted Stock Deferrals. An Officer or Director may elect
to have all or a portion (in increments of 25%) of his or her Annual Incentive
Compensation or Director's Fees that may become earned or be payable, as the
case may be, with respect to a year paid in the form of shares of Restricted
Stock having a Fair Market Value (disregarding the restrictions) equal to the
amount of cash compensation that would otherwise be earned or payable. Such
deferral election with respect to any year must be made (i) with respect to an
Officer, October 1, and (ii) with respect to a Director, January 1 of the year.
The shares of Restricted Stock shall vest (i.e., the restrictions thereon shall
lapse) at the rate of 25% per year on each January 1 following the date the
Restricted Stock is issued to the Participant, unless the Participant, in the
deferral election, elects for the restrictions on the Restricted Stock to lapse
on or beginning on a specified January 1 that is no earlier than the fourth
January 1 following the date the Restricted Stock is credited to the
Participant. In the event of such an election, the Participant may also specify
a different "lapse" rate for the restrictions on the Restricted Stock, provided
it is in increments of 5%. The deferral election shall be irrevocable and shall
be made on a form provided by the Company, which shall govern the amount
deferred and the timing of the lapse of the restrictions. All dividends and
other distributions made with respect to shares of Restricted Stock during the
restricted period shall be fully vested and paid currently to the Participant.
A Participant shall be entitled to vote his or her shares of Restricted Stock.
Upon a Participant's Termination due to death or Permanent Disability or an
involuntary Termination other than for Cause, the restrictions shall
automatically lapse on all of the Participant's shares of Restricted Stock.
Upon a Termination for any other reason, a Participant's shares of



                                      -8-

<PAGE>   11



Restricted Stock shall be automatically forfeited, unless and to the extent the
Committee, in its sole discretion, elects to waive such forfeiture.

         4.4      Director Fees Deferrals. Before January 1 of any year (or,
with respect to an individual who first becomes a Director during a year,
within 30 days of the date on which he or she becomes a Director), each
Director may elect to have all or a portion (in increments of 25%) of his or
her Director Fees for that year (or, if applicable, the remainder of the year)
deferred in an Account under the Plan. The election shall be irrevocable and
shall be made on a form prescribed by the Company, which shall govern the
amount deferred, the timing of the payment of the Account, and the investment
of the Account during such deferral period pending its payment by the Company.
A Participant's deferral election hereunder shall apply only to Director Fees
earned during that year or partial year, as the case may be. If a Director has
not made a deferral election with respect to a year, the Director Fees payable
to the Director for that year shall be paid in accordance with the Company's
normal practices.

         4.5      Accounts. The Company shall establish one or more Accounts for
each Participant who has elected to defer compensation under the Plan, other
than in the form of shares of Restricted Stock, for the purpose of reflecting
the Employer's obligation to pay the compensation deferred by such Participant,
as adjusted for any investment gains or losses of such Account(s) under the
Plan.

         4.6      Investment of Accounts. A Participant may direct that all or a
specified percentage (in increments of 5%) of his or her Account established
for any year be "invested" (i.e., credited on an Employer ledger account) in
one or more of the Investment Accounts. If the Account is directed by the
Participant to be invested in more than one of the Investment Accounts, the
Employer shall establish separate subaccounts under the Participant's Account,
which shall be credited (i) with



                                      -9-

<PAGE>   12



respect to deferrals in Phantom Stock, whole and fractional shares of Phantom
Stock as of the dates of the deferrals, and with phantom dividends with respect
to the credited shares of Phantom Stock, which shall be credited as being
reinvested in additional shares of Phantom Stock on the applicable date, (ii)
with respect to deferrals in the Mutual Fund Account, with whole and fractional
phantom units in such mutual fund(s) as of the dates of the deferrals and with
phantom distributions on such units, which shall be credited as being
reinvested in additional phantom units in such mutual fund(s), and (iii) with
respect to deferrals in the Interest Account, with interest at the rate
provided by the Interest Account.

         4.7      Changes in Investment Elections. Except as provided below, a
Participant may direct that all or a specified percentage (in increments of 5%)
of any of his or her Account(s) be reinvested in one or more of the other
Investment Accounts in accordance with Plan procedures as established from time
to time by the Committee (or its designee). This election shall be in such form
as the Company shall establish from time to time. However, the foregoing shall
not operate or be construed from permitting a Participant to irrevocably waive
(in such manner as may be approved by the Company) the ability to direct that
his or her Phantom Stock Account be reinvested in one or more of the other
Investment Accounts under the Plan.

         4.8      Payment of Accounts. Upon a Participant's Designated Payment
Date, the Employer shall pay to the Participant (or to his or her Beneficiary
in case of the Participant's death) an amount in cash equal to the balance (or
applicable designated portion thereof) then credited to the Participant's
affected Account(s), except that any payment with respect to shares of Phantom
Stock shall be made, to the extent practical, in shares of Common Stock with
any balance paid in cash. The forms of payment permitted to be designated by a
Participant under the Plan are as follows:



                                      -10-

<PAGE>   13



         (a)      a lump sum payment; or

         (b)      consecutive annual installments over a period not to exceed 15
         years, with the amount of each installment being equal to a fraction,
         the numerator of which is one and the denominator of which is the
         number of installments remaining to be paid, including the installment
         then being paid. 

         4.9      Committee Acceleration of Payments. Notwithstanding a 
Participant's deferral election to the contrary, the Committee, in its sole
discretion, may accelerate the payment of all or part of the balance of a
Participant's Account(s) upon its determination that the Participant has
incurred a "severe financial hardship" resulting from a sudden and unexpected
illness or accident of such person or of a dependent, a loss of such person's
property due to casualty, or other similar extraordinary and unforeseeable
circumstances arising as a result of events beyond the control of such person.
The Committee, in making its determination of severe financial hardship may
consider such factors and require such information as it deems appropriate,
but, in any case, payment may not be made to the extent that such hardship is
or may be relieved (i) through reimbursement or compensation by insurance or
otherwise or (ii) by liquidation of such person's assets, to the extent
liquidation of such assets will not itself cause severe financial hardship.

         4.10     Acceleration of Payments Upon a Change in Control.
Notwithstanding anything in the Plan to the contrary, effective upon a Change
in Control (i) all restrictions on shares of Restricted Stock shall
automatically lapse and (ii) the Employer shall pay the Participants the then
balance of his or her Account(s) in a lump sum in cash; provided, however,
notwithstanding the foregoing, if it is intended by the Board or the Committee
that the transaction constituting the Change in Control be accounted for as a
"pooling of interests" and the cashout of the Phantom Stock



                                      -11-

<PAGE>   14



Accounts would otherwise preclude such accounting treatment, such Phantom Stock
Accounts shall be paid in shares of Common Stock immediately prior to such
Change in Control, with any fractional Phantom Stock paid in cash.

                                   SECTION 5

                               GENERAL PROVISIONS

         5.1      Unfunded Obligation. The amounts to be paid to Participants
pursuant to this Plan are unfunded obligations of the Employer. The Employer is
not required to segregate any monies from its general funds, to create any
trusts, or to make any special deposits with respect to this obligation. Title
to and beneficial ownership of any investments, including trust investments,
which the Employer may make to fulfill this obligation shall at all times
remain in the Employer. Any investments and the creation or maintenance of any
trust or notional accounts shall not create or constitute a trust or a
fiduciary relationship between the Committee or the Employer and a Participant,
or otherwise create any vested or beneficial interest in any Participant or his
or her Beneficiary or his or her creditors in any assets of the Employer
whatsoever. The Participants (and Beneficiaries) shall have no claim against
the Employer for any changes in the value of any Accounts and shall be general
unsecured creditors of the Employer with respect to any payment due under this
Plan.

         5.2      Incapacity of Participant or Beneficiary. If the Committee
finds that any Participant or Beneficiary to whom a payment is payable under
the Plan is unable to care for his or her affairs because of illness or
accident or is under a legal disability, any payment due (unless a prior claim
therefore shall have been made by a duly appointed legal representative) at the
discretion of the Committee, may be paid to the spouse, child, parent or
brother or sister of such Participant or



                                      -12-

<PAGE>   15



Beneficiary or to any person whom the Committee has determined has incurred
expense for such Participant or Beneficiary. Any such payment shall be a
complete discharge of the obligations of the Company under the provisions of
the Plan.

         5.3      Nonassignment. The right of a Participant or Beneficiary to
the payment of any amounts under the Plan may not be assigned, transferred,
pledged or encumbered in any manner nor shall such right or other interests be
subject to attachment, garnishment, execution or other legal process.
Notwithstanding the foregoing however, a Participant may surrender shares of
Restricted Stock under this Plan to exercise a stock-based award under another
stock plan of the Company provided that such other award is paid in shares of
Common Stock that, to the extent of the shares of Restricted Stock surrendered,
are subject to the same substantial risks of forfeiture as such surrendered
shares.

         5.4      No Right to Continued Employment. Nothing in the Plan shall be
construed to confer upon any Participant any right to continued employment with
the Employer or any Affiliate, nor interfere in any way with the right of the
Employer or any Affiliate to terminate the employment of such Participant at
any time without assigning any reason therefor.

         5.5      Withholding Taxes. Appropriate taxes shall be withheld from
the Participant's compensation with respect to all deferrals made under, and
from all payments made pursuant to, the Plan.

         5.6      Termination and Amendment. The Board or Committee may from
time to time amend, suspend or terminate the Plan, in whole or in part, without
the consent of any Participant and if the Plan is suspended or terminated, the
Board or Committee may reinstate any or all of its provisions. However, no
amendment, suspension or termination of the Plan may impair the right of



                                      -13-

<PAGE>   16



a Participant or his or her Beneficiary to receive the benefit accrued
hereunder prior to the effective date of such amendment, suspension or
termination.

         5.7      Compliance with Securities Laws. It is the intention of the
Company that, so long as any of the Company's equity securities are registered
pursuant to Section 12(b) or 12(g) of the Securities Exchange Act of 1934, as
amended, this Plan shall be operated in compliance with Section 16(b) thereof
and, if any Plan provision or transaction is found not to comply with Section
16(b), that provision or transaction, as the case may be, shall be deemed null
and void ab initio. Notwithstanding anything in the Plan to the contrary, the
Committee, in its absolute discretion, may bifurcate the Plan so as to
restrict, limit or condition the use of any provision of the Plan to
Participants who are officers and directors subject to Section 16(b) without so
restricting, limiting or conditioning the Plan with respect to other
Participants.

         5.8      Adjustments. In the event that the Committee determines that
any dividend or other distribution (whether in the form of cash, shares of
Common Stock, other securities, or other property), recapitalization, stock
split, reverse stock split, reorganization, merger, consolidation, split-up,
spin-off, combination, repurchase, or exchange of shares of Common Stock or
other securities of the Company, issuance of warrants or other rights to
purchase shares of Common Stock or other securities of the Company, or other
similar corporate transaction or event affects the shares of Common Stock such
that an adjustment is determined by the Committee to be appropriate in order to
prevent dilution or enlargement of the benefits or potential benefits intended
to be made available under the Plan, then the Committee shall, in such manner
as it may deem equitable, adjust any or all of (i) the number and type of
shares of Common Stock (or other securities or property) with respect



                                      -14-

<PAGE>   17


to which deferrals may be made and (ii) the number and type of shares of Common
Stock (or other securities or property) subject to outstanding deferrals.

         5.9      Sources of Shares. Any shares of Common Stock delivered 
pursuant to this Plan shall consist solely of treasury shares or shares
purchased on the open market.

         5.10     Share Certificates. All certificates for shares of Restricted
Stock or Common Stock delivered under the Plan shall be subject to such stop
transfer orders and other restrictions as the Committee may deem advisable
under the Plan or the rules, regulations, and other requirements of the SEC,
any stock exchange upon which such shares or other securities are then listed,
and any applicable federal or state laws. In addition, the Committee may cause
a legend or legends to be put on any such certificates to make appropriate
reference to such restrictions, and any such restrictions as are imposed by the
Plan, including, with respect to Restricted Stock, the restrictions on
transferability and vesting. Unless otherwise approved by the Committee,
certificates representing shares of Restricted Stock will be held in escrow by
the Company until such time as such restrictions have expired or the shares
have been forfeited.

         5.11     Applicable Law. Except to the extent preempted by applicable
federal law, the Plan shall be construed and governed in accordance with the
laws of the State of Texas.


                                      UNION TEXAS PETROLEUM
                                      HOLDINGS, INC.


                                      By: /s/ JOHN L. WHITMIRE
                                          --------------------------------------
                                          John L. Whitmire
                                          Chairman and Chief Executive Officer



                                      -15-


<PAGE>   1
                                  ADDENDUM TO
                          BADAK IV LNG SALES CONTRACT
                                SUPPLY AGREEMENT

         THIS ADDENDUM, made and entered into in Jakarta the 31st day of
January, 1994, but effective as of the 23rd day of October, 1990, by and
between PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA ("PERTAMINA"), on
the one hand, and VIRGINIA INDONESIA COMPANY ("VICO"), LASMO SANGA SANGA
LIMITED, OPICOIL HOUSTON, INC., UNION TEXAS EAST KALIMANTAN LIMITED, UNIVERSE
GAS & OIL COMPANY, INC., AND VIRGINIA INTERNATIONAL COMPANY (herein referred to
collectively as "Contractors" and individually as "Contractor"), on the other
hand,

                                  WITNESSETH:

         WHEREAS, PERTAMINA and Contractors are parties to the Badak IV LNG
Sales Contract Supply Agreement, made and entered into the 12th day of August,
1991, but effective as of the 23rd day of October, 1990 (the "Supply
Agreement") (unless otherwise stated, any terms defined in the Supply Agreement
shall have the same meanings when used herein); and

         WHEREAS, under the Supply Agreement PERTAMINA and Contractors have
committed to supply and deliver from proved recoverable reserves of natural gas
in specific fields within the VICO Contract Area sufficient natural gas (and
LNG resulting from the liquefaction thereof) to meet a portion of the Badak IV
Base Net Gas Requirement and the Badak IV Additional Net Gas Requirement over
the term of the Supply Agreement; and

         WHEREAS, the initial figures for the VICO Contract Gas, the Other
Contract Gas and the Producers' Percentage set forth in the Supply Agreement
were established by PERTAMINA to be used only on a provisional basis until such
time as DeGolyer and MacNaughton certified such reserves, following which the
identity of the participating fields was to be documented and the quantities in
each field which comprise the VICO Contract Gas and the Other Contract Gas and
the Producers' Percentage were to be adjusted and documented in a supplemental
memorandum (the "Supplemental Memorandum") in accordance with the Memorandum of
Understanding Re: Supply Agreements and Package IV Sales dated August 12, 1991;
and

         WHEREAS, upon completion of such adjustments, but not later than the
date of loading the initial cargo of LNG for delivery under the Badak IV LNG
Sales Contract, PERTAMINA and Contractors agreed to execute an addendum to the
Supply Agreement confirming the VICO participating fields, the quantities in
each field which comprise the VICO Contract Gas and the Other Contract Gas, and
the Producers' Percentage; and

         WHEREAS, such adjustments have been completed and agreed to by
PERTAMINA, Contractors and the production sharing contractors in the Other
Contract Areas and the Supplemental Memorandum has been entered into of even
date herewith.



<PAGE>   2



         NOW, THEREFORE, the parties agree as follows:

         1.       The Producers' Percentage is 27.2064%.

         2.       The VICO Contract Gas is 0.650570 t.s.c.f.

         3.       The VICO participating fields and the quantities in each
                  field comprising the VICO Contract Gas are as follows:

<TABLE>
<CAPTION>
                           Participating Field                Quantity of Gas (t.s.c.f.)
                           -------------------                --------------------------
                           <S>                                <C>
                           Badak                                 0.159137
                           Nilam                                 0.257704
                           Mutiara                               0.092838
                           Semberah                              0.136132
                           Pamaguan                              0.004759
</TABLE>

         4.       Subject to the foregoing, the undersigned parties hereby
                  ratify and confirm the Supply Agreement.

         5.       By separate addenda similar hereto and compatible herewith,
                  executed and delivered at the same time as this Addendum,
                  PERTAMINA and the production sharing contractors in the Other
                  Contract Areas shall confirm the quantity of the Other
                  Contract Gas.

IN WITNESS WHEREOF, PERTAMINA and Contractors have caused their duly authorized
representatives to execute this Addendum as of the day and year first written
above.


PERUSAHAAN PERTAMBANGAN                            CONTRACTORS:
MINYAK DAN GAS BUMI
NEGARA (PERTAMINA)                                 VIRGINIA INDONESIA COMPANY


By  /s/ F. ABDA'OE                                 By  /s/ CHARLES REIMER
    -------------------------                          -------------------------


                                                   LASMO SANGA SANGA LIMITED


                                                   By  /s/ [ILLEGIBLE]
                                                       -------------------------



                                       2

<PAGE>   3


                                               OPICOIL HOUSTON, INC.



                                               By  /s/ CHING YUNG CHUNG
                                                   -----------------------------
                                                   Executive Vice President

                                               UNION TEXAS EAST KALIMANTAN
                                               LIMITED


                                               By  /s/ A.W. PEABODY, JR.
                                                   -----------------------------

                                               UNIVERSE GAS & OIL COMPANY, INC.


                                               By  /s/ HIDESUKE NAMJO
                                                   -----------------------------
                                                   General Manager

                                               VIRGINIA INTERNATIONAL COMPANY


                                               By  /s/ [ILLEGIBLE]
                                                   -----------------------------


                                       3

<PAGE>   1
                            MEMORANDUM OF AGREEMENT



                                    BETWEEN



                      PERTAMINA AND KOREA GAS CORPORATION



                                      FOR



                            PURCHASE AND SALE OF LNG



                               DURING 1995 - 1999








<PAGE>   2



                            MEMORANDUM OF AGREEMENT
                                      FOR
                   PURCHASE AND SALE OF LNG DURING 1995-1999



This Memorandum of Agreement ("Agreement") dated September 30, 1994 is made by
and between PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA ("PERTAMINA")
("Seller") and Korea Gas Corporation ("KGC") ("Buyer"), for the sale and
purchase of certain quantities of LNG as described below. Seller and Buyer are
collectively referred to herein as the "Parties".

WHEREAS, Seller and Buyer are parties to an Amended and Restated LNG Sales and
Purchase Contract, effective as of January 1, 1991 ("Arun III Contract") which
is in full force and effect and which is unaffected by this Agreement; and

WHEREAS, Seller and Buyer are parties to the LNG Sales and Purchase Contract
(Korea II), effective as of May 7, 1991 ("Korea II Contract") which is in full
force and effect and which is unaffected by this Agreement ; and

WHEREAS, Seller desires to sell and Buyer desires to purchase certain
quantities of LNG during the period 1995 to 1999.

NOW THEREFORE, in consideration of the mutual promises contained herein, the
Parties agree as follows :



                                      -1-



<PAGE>   3


                                ARTICLE I - TERM

The term of this Agreement shall commence on January 1, 1995 and shall
terminate on December 31, 1999.

                         ARTICLE II - FIXED QUANTITIES

During each calendar year specified below ("Fixed Quantity Period"), Seller
shall sell and deliver to Buyer and Buyer shall purchase, receive and pay for,
at the applicable Contract Sales Price, the quantity of LNG specified for such
Fixed Quantity Period (each such quantity being called a "Fixed Quantity") as
follows :

<TABLE>
<CAPTION>
       Fixed Quantity                                 Fixed Quantities (Number of Cargoes)
       --------------                                 ------------------------------------

           Period                      Ex-Ship                       F.O.B.                       Total
           ------                      -------                       ------                       -----

            <S>                           <C>                          <C>                         <C>
            1995                          7                            6                           13
            1996                          23                           3                           26
            1997                          20                           3                           23
            1998                          15                           4                           19
            1999                          -                            27                          27
</TABLE>

One Ex-Ship cargo is equivalent to 2,900 Billion BTU's.
One F.O.B. cargo is equivalent to 2,940 Billion BTU's.

                          ARTICLE III - TRANSPORTATION

(a)      Seller shall be responsible for providing transportation for the
         Ex-Ship Fixed Quantities specified in Article II above, on an Ex-Ship
         basis.


                                      -2-



<PAGE>   4



(b)      Buyer shall be responsible for providing transportation for the F.O.B.
         Fixed Quantities specified in Article II above, on an F.O.B. basis.

(c)      In providing transportation hereunder, the Parties shall use LNG
         Tankers which are compatible with the Loading Port and the Receiving
         Facility and which have the required port clearances, authorizations
         and approvals. The Parties shall use their respective best efforts to
         obtain such clearances, authorizations and approvals.

                       ARTICLE IV - CONTRACT SALES PRICE

(a)      Ex-Ship Fixed Quantities

         The Contract Sales Price for the Ex-Ship Fixed Quantities shall be the
         sum of an LNG related portion ("LNG Related Portion") and a transport
         related portion ("Transport Related Portion").

         The LNG Related Portion shall be 0.159 REP, where REP is the
         arithmetic average of the realized export prices, in U.S. Dollars per
         barrel, F.O.B. Indonesia, of all field classifications of Indonesian
         crude oils (including condensate) then being sold and exported, except
         premiums and except such prices for spot sales.

         The Transport Related Portion shall be U.S.$0.62/MMBTU as at January
         1, 1994, escalating 2.5% per annum thereafter.

(b)      F.O.B. Fixed Quantities
         The Contract Sales Price for the F.O.B. Fixed Quantities shall be
         equal to the LNG Related Portion for the Ex-Ship Quantities referred
         to in (a) above, multiplied by a boil-off adjustment factor of 0.9865.

                                      -3-



<PAGE>   5



                         ARTICLE V - SOURCES OF SUPPLY

The Natural Gas to be processed into LNG and sold and delivered hereunder is to
be produced from the areas in East Kalimantan covered by production sharing
contracts between PERTAMINA and its relevant suppliers, and loaded at
PERTAMINA's facility at Bontang, East Kalimantan.

                   ARTICLE VI - GENERAL TERMS AND CONDITIONS

(a)      Ex-Ship Fixed Quantities

         All of the terms and conditions of the Arun III Contract shall apply
         to the Ex-Ship Fixed Quantities and shall be incorporated in this
         Agreement (mutatis mutandis) except for terms which are specifically
         excluded below, or which conflict with the terms herein. Capitalized
         terms used herein in connection with the Ex-Ship Fixed Quantities
         shall have the same meaning as set forth in the Arun III Contract
         unless otherwise specifically defined herein.

         The following Articles of the Arun III Contract are hereby expressly
         excluded from this Agreement :

         7.1      Fixed Quantity (save that each of the calendar years
                  1995-1999 shall be referred to as a "Fixed Quantity Period"
                  and the quantity of LNG set out for delivery hereunder in
                  each such calendar year shall be referred to as the "Fixed
                  Quantity" for such Fixed Quantity Period);
         7.3      Buyer's Obligation to Take-or-Pay;
         7.4      Allocation of Deliveries of Fixed Quantities Between Buyer and
                  Other Purchasers;
         7.6      Make-Up LNG;
         7.7      Allocation for Make-Good LNG, Make-Up LNG and Restoration
                  Quantities; and
         7.8      Priority Order.



                                      -4-



<PAGE>   6



(b)      F.O.B. Fixed Quantities

         All of the terms and conditions of the Korea II Contract shall apply
         to the F.O.B. Fixed Quantities and shall be incorporated in this
         Agreement (mutatis mutandis) except for terms which are specifically
         excluded below, or which conflict with the terms herein. Capitalized
         terms used herein in connection with the F.O.B. Fixed Quantities shall
         have the same meaning as set forth in the Korea II Contract unless
         otherwise specifically defined herein.

         The following Articles of the Korea II Contract are hereby expressly
         excluded from this Agreement :

         7.1      Fixed Quantity (save that each of the calendar years
                  1995-1999 shall be referred to as a "Fixed Quantity Period"
                  and the quantity of LNG set out for delivery hereunder in
                  each such calendar year shall be referred to as the "Fixed
                  Quantity" for such Fixed Quantity Period);
         7.3      Buyer's Obligation to Take-or-Pay;
         7.4      Allocation of Deliveries of Fixed Quantities Between Buyer and
                  Other Purchasers;
         7.5      Make-Up LNG;
         7.7      Allocation for Make-Up LNG and Restoration Quantities; and
         7.8      Priority Order.



                                      -5-



<PAGE>   7


IN WITNESS WHEREOF, each of the Parties has caused this Agreement to be
executed and signed by its duly authorized officer as of this 30th day of
September, 1994.



SELLER :                                              BUYERS :
PERUSAHAAN PERTAMBANGAN MINYAK                        KOREA GAS CORPORATION
DAN GAS BUMI NEGARA (PERTAMINA)



/s/ F. ABDA'OE                                        /s/ PARK CHUNG-BOO
- -------------------------                             --------------------------
By: F. Abda'oe                                        By: Park, Chung-Boo
Title: President Director                             Title: President
       & C.E.O.                                              & C.E.O.


                                      -6-



<PAGE>   1
                           PACKAGE V SUPPLY AGREEMENT

                 (1995-1999 LNG SALES TO KOREA GAS CORPORATION)


                                    between


                                   PERTAMINA


                                      and


                           VIRGINIA INDONESIA COMPANY
                           LASMO SANGA SANGA LIMITED
                             OPICOIL HOUSTON, INC.
                      UNION TEXAS EAST KALIMANTAN LIMITED
                        UNIVERSE GAS & OIL COMPANY, INC.
                                      and
                         VIRGINIA INTERNATIONAL COMPANY




                         Dated: June 16, 1995
                         Effective: September 30, 1994




<PAGE>   2



                           PACKAGE V SUPPLY AGREEMENT
                 (1995-1999 LNG SALES TO KOREA GAS CORPORATION)

         THIS SUPPLY AGREEMENT, made and entered into in Jakarta on June 16,
1995, by and between PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA
("PERTAMINA"), on the one hand, and VIRGINIA INDONESIA COMPANY ("VICO"), LASMO
SANGA SANGA LIMITED, OPICOIL HOUSTON, INC., UNION TEXAS EAST KALIMANTAN
LIMITED, UNIVERSE GAS & OIL COMPANY, INC., and VIRGINIA INTERNATIONAL COMPANY
(herein referred to collectively as "Contractors" and individually as
"Contractor"), on the other hand,

                                  WITNESSETH:

         A. WHEREAS, Contractors individually own or control all of the
interest of "Contractors" in that certain Amended and Restated Production
Sharing Contract, dated April 23, 1990, but effective as of August 8, 1968
(such contract as hereafter amended is herein referred to as the "Amended and
Restated Production Sharing Contract") and that certain Production Sharing
Contract dated April 23, 1990, but effective as of August 8, 1998 (such
contract as hereafter amended is herein referred to as the "Renewed Production
Sharing Contract"). The Amended and Restated Production Sharing Contract and
the Renewed Production Sharing Contract are herein referred to collectively as
the "Production Sharing Contracts" and the area covered thereby is herein
referred to as the "VICO Contract Area"; and

         B. WHEREAS, pursuant to the Production Sharing Contracts, each of
PERTAMINA and Contractors is entitled to take and receive, sell and freely
export its respective share of the Natural Gas produced and saved from the VICO
Contract Area (the percentage share of such Natural Gas to which each of
PERTAMINA and Contractors is entitled, as determined under the Production
Sharing Contracts, is herein referred to as the "Production Sharing Percentage"
of such party); and


<PAGE>   3



         C. WHEREAS, the reserves of Natural Gas in the VICO Contract Area
exceed the reserves of Natural Gas committed to be produced, supplied and
delivered by PERTAMINA and Contractors to meet a portion of PERTAMINA's
existing obligations under LNG sales contracts, LPG sales contracts, and
domestic gas sales contracts; and

         D. WHEREAS, PERTAMINA, with assistance from Contractors, has
constructed and expanded and is further expanding the Natural Gas liquefaction
and related facilities located at Bontang Bay, on the east coast of Kalimantan,
Indonesia (herein referred to as the "Bontang Plant"); and

         E. WHEREAS, funds for the expansion of the liquefaction plant will be
provided to PERTAMINA through financing of the cost of such expansion on terms,
mutually agreeable to PERTAMINA and Contractors, which provide for the
repayment of funds provided pursuant to such financing and the cost of such
funds (repayment of funds and the cost of such funds are hereinafter referred
to as "Financing Costs"); and

         F. WHEREAS, PERTAMINA and Contractors are parties to the Amended and
Restated Bontang Processing Agreement dated as of February 9, 1988 (as from
time to time amended, the "Processing Agreement"), which provides for the
operation of the Bontang Plant and the payment of the costs of such operation
(such costs as determined in accordance with the Processing Agreement are
herein referred to as "Plant Operating Costs"); and

         G. WHEREAS, PERTAMINA and Contractors have agreed to use the Bontang
Plant in part for the liquefaction of the VICO Contract Gas (as defined in
Section 2.2 hereof) and the Other Contract Gas (as defined in Section 2.3
hereof); and

         H. WHEREAS, PERTAMINA, in collaboration with Contractors and its
production sharing contractors in other contract areas in East Kalimantan
(herein referred to as the "Other Contract Areas"), has entered into a
Memorandum of Agreement dated September 30, 1994, ("MOA", and unless otherwise
so stated, any terms defined in the MOA shall have the same


                                     - 2 -

<PAGE>   4



meanings when used herein) with Korea Gas Corporation ("Buyer") pursuant to
which PERTAMINA is obligated to sell to Buyer certain quantities of LNG on an
ex-ship basis and certain quantities of LNG on an FOB basis; and

         I. WHEREAS, the MOA provides that the Natural Gas to be processed into
LNG and sold by PERTAMINA under the MOA is to be produced from the areas in
East Kalimantan covered by production sharing contracts between PERTAMINA and
its suppliers, which consists of the VICO Contract Area and the Other Contract
Areas; and

         J. WHEREAS, arrangements for the transportation of the ex-ship
quantities pursuant to the MOA and for the payment of costs respecting such
transportation will be made on terms mutually agreeable to PERTAMINA and
Contractors (herein referred to as "Transportation Costs"); and

         K. WHEREAS, PERTAMINA and each Contractor desire to supply and deliver
Natural Gas from the VICO Contract Area in support of the performance by
PERTAMINA of an agreed portion of its obligations under the MOA; and

         L. WHEREAS, each Contractor desires to dispose of its Production 
Sharing Percentage of the VICO Contract Gas (as herein defined) in accordance
with the terms of this Supply Agreement,

         NOW, THEREFORE, the parties agree as follows:


                                   ARTICLE 1
                          EFFECTIVE DATE AND DURATION

         This Supply Agreement shall be effective as of September 30, 1994, and
shall terminate on the date when all rights and obligations of Contractors
hereunder have been satisfied.


                                     - 3 -

<PAGE>   5




                                   ARTICLE 2
                         SUPPLY COMMITMENT AND QUANTITY

         2.1 Net Gas Requirement. The total quantity of net Natural Gas
required to be supplied and delivered out of proved recoverable reserves of
Natural Gas in East Kalimantan for liquefaction and sale as LNG under the MOA
is estimated to be .3243 trillion standard cubic feet ("t.s.c.f."). Such
quantity is herein referred to as the "MOA Net Gas Requirement". The MOA Net
Gas Requirement is based on the Fixed Quantities which Buyer has committed to
purchase pursuant to the terms of the MOA.

         2.2 VICO Contract Gas. PERTAMINA and Contractors hereby commit and
agree to supply and deliver from proved economically recoverable reserves of
Natural Gas in specific fields within the VICO Contract Area sufficient Natural
Gas (and LNG resulting from the liquefaction thereof) to meet a portion of the
MOA Net Gas Requirement over the term of this Supply Agreement consisting of
0.0700 t.s.c.f., or 21.5956% thereof. Such quantities of net Natural Gas
committed to be supplied pursuant to this Supply Agreement are herein referred
to as the "VICO Contract Gas", and the above-stated percentage is herein
referred to as the "Producers' Percentage". The specific fields from which the
VICO Contract Gas will be committed are identified in the supplemental
memorandum entered into among PERTAMINA, Contractors and the production sharing
contractors in the Other Contract Areas pursuant to the Memorandum of
Understanding Re: Supply Agreements and Package V Sales dated October 5, 1994
(the "Package V Supplemental Memorandum"). The VICO participating fields and
the quantities in each field comprising the VICO Contract Gas are as follows:

<TABLE>
<CAPTION>
         Participating Fields                Quantity of Gas (t.s.c.f.)
         --------------------                --------------------------
               <S>                           <C>
               Badak                                 0.0232
               Lampake                               0.0020
               Mutiara                               0.0093
               Nilam                                 0.0245
               Pamaguan                              0.0003
               Semberah                              0.0107

</TABLE>


                                     - 4 -

<PAGE>   6




The quantities committed from each field are subject to revision from time to
time, as the reserves from the fields may be updated and as additional data,
from deliverability studies and otherwise, become available.

         2.3 Other Contract Gas. To meet the balance of the MOA Net Gas
Requirement, constituting 0.2543 t.s.c.f., or 78.4044% thereof, sufficient
Natural Gas (and LNG resulting from the liquefaction thereof) will be committed
for supply and delivery by PERTAMINA and its production sharing contractors
from proved economically recoverable reserves of Natural Gas in the Other
Contract Areas by separate supply agreements, similar hereto and compatible
herewith, executed and delivered concurrently herewith (such amounts are herein
collectively referred to as the "Other Contract Gas"). The specific fields from
which the Other Contract Gas will be committed are also identified in the
Package V Supplemental Memorandum.

         2.4 DeGolyer and MacNaughton Certification. The amounts of net Natural
Gas constituting the VICO Contract Gas and the Other Contract Gas are part of
the estimates of proved recoverable reserves of Natural Gas as certified by the
independent consultant firm of DeGolyer and MacNaughton in written statements
based on data available on May 31, 1994.

         The quantities for the VICO Contract Gas and the Other Contract Gas
set forth in Sections 2.2 and 2.3 hereof and the Producers' Percentage were
established by PERTAMINA at a meeting on May 29, 1995 of the East Kalimantan
Gas Reserves Management Committee.


                                   ARTICLE 3
                           COORDINATION OF GAS SUPPLY

         The VICO Contract Gas and the Other Contract Gas may be produced from
participating fields at times and production rates which may change from time
to time during the term hereof so


                                     - 5 -

<PAGE>   7



as to secure the optimal ultimate recovery of Natural Gas. The supply of
Natural Gas from the VICO Contract Area and the Other Contract Areas will be
coordinated by PERTAMINA so as to conserve and permit full utilization of such
Natural Gas. The sources of supply, producing rates, quality of gas, metering
and related matters shall be matters for study by the East Kalimantan Gas
Reserves Management Committee, consisting of representatives from PERTAMINA,
VICO, TOTAL Indonesie and Unocal Indonesia Company.


                                   ARTICLE 4
                   ADMINISTRATION, INSURANCE AND CONSULTATION

         4.1 MOA. PERTAMINA shall be responsible for the due and prompt
administration of the MOA for the benefit of PERTAMINA and Contractors. All
matters which affect the MOA or the sale, transportation and delivery of LNG
thereunder will be administered by a representative to be appointed by
PERTAMINA and the representative appointed by Contractors under Article 9
hereof. It is understood, however, that it will be necessary from time to time
for PERTAMINA, as seller under the MOA, to take certain administrative and
operational actions without prior consultation where immediate action is
required. Contractors will be promptly advised of any such action.

         4.2 Insurance. PERTAMINA shall ensure that the interests of it and
each Contractor in respect of each ex-ship cargo of LNG transported by
PERTAMINA from the Bontang Plant to Buyer shall be adequately insured pursuant
to arrangements mutually agreed to by PERTAMINA and each Contractor. PERTAMINA
and each Contractor shall be entitled to receive its Production Sharing
Percentage of the Producers' Percentage of any proceeds paid under a marine
insurance policy covering an ex-ship cargo of LNG being transported from the
Bontang Plant. Such proceeds shall be remitted by the insurer directly to the
bank designated as Trustee pursuant to Article 6 hereof.




                                     - 6 -

<PAGE>   8



         4.3 Consultation. PERTAMINA and Contractors agree to consult with each
other freely on all matters relating to the MOA. PERTAMINA and Contractors
shall confer and agree as to any amendment to the MOA or to any permitted
action or election thereunder which constitutes a material adjustment in the
quantities of LNG to be sold and delivered thereunder or a change in the terms
thereof. At the request of any party hereto, a memorandum evidencing any such
agreement shall be prepared as soon as feasible and signed by each party
hereto.

                                   ARTICLE 5
                         TITLE, DELIVERY AND INVOICING

         5.1 Title. PERTAMINA will cause the LNG resulting from the
liquefaction of the VICO Contract Gas and the Other Contract Gas to be
delivered to Buyer at the "Delivery Point" as that term is defined in the MOA.
Title to each Contractor's share of the LNG resulting from the liquefaction of
the VICO Contract Gas shall pass to PERTAMINA at the same time as the passage
of title from PERTAMINA to Buyer pursuant to the MOA.

         5.2 Delivery and Invoicing. At the time of delivery of each cargo of
LNG to Buyer at the relevant "Delivery Point", PERTAMINA will furnish
Contractors with appropriate documentation to evidence the quantity and quality
of LNG delivered, together with copies of the invoices to Buyer in respect of
the sale of LNG in question. PERTAMINA will also furnish Contractors with a
copy of each invoice or billing delivered to Buyer on account of interest or
other payment obligation of Buyer pursuant to the MOA concurrently with its
being furnished to Buyer. Calculation of the Contract Sales Price as provided
for in the MOA, the amount of sales invoices and other billings to Buyer, and
any adjustments, shall be reviewed and approved by PERTAMINA and Contractors
prior to presentation to Buyer.





                                     - 7 -

<PAGE>   9

                                   ARTICLE 6
                            ENTITLEMENT AND PAYMENT

         6.1 Contractor Entitlement. The amounts to be paid to each Contractor
for its share of the LNG resulting from the liquefaction of Natural Gas to be
supplied under this Supply Agreement shall be its Production Sharing Percentage
of the Producers' Percentage of the sum of:

         (a) all amounts to be paid by Buyer to PERTAMINA for LNG sold and
delivered under the MOA;

         (b) all other amounts which Buyer shall become obligated to pay
pursuant to the MOA with regard to deliveries of LNG thereunder including, but
not limited to, any interest accruing on overdue invoice payments;

         (c) amounts payable by insurers in respect of LNG resulting from the
liquefaction of the VICO Contract Gas and the Other Contract Gas; and

         (d) interest earned on any of the amounts referred to in this Section
6.1.

         6.2 PERTAMINA Assignment of Contractor Percentage Share. In order to
arrange for the receipt by each Contractor of the payments to which such
Contractor is entitled under Section 6.1 hereof, PERTAMINA hereby assigns to
each Contractor that Contractor's Production Sharing Percentage of the
Producers' Percentage of all amounts referred to in Section 6.1 hereof.

         6.3 Method of Payment. Throughout the term of this Supply Agreement,
all those payments referred to in Section 6.1 hereof shall be paid in U.S.
Dollars, directly to BankAmerica International in New York City (or such other
leading bank in the United States as shall be selected by PERTAMINA and approved
by Contractors) pursuant to a Trustee and Paying Agent Agreement, the parties to
which shall be PERTAMINA, Contractors, the production sharing contractors in the
Other Contract Areas and the Trustee thereunder. Amounts so received by the
Trustee shall be used for payment of (i) Financing Costs; (ii) an agreed portion
of Plant


                                     - 8 -

<PAGE>   10



Operating Costs; (iii) Transportation Costs in respect of the ex-ship cargoes;
and (iv) other costs approved by PERTAMINA and Contractors. Amounts received by
the Trustee, to the extent that they are not used for payment of the costs
referred to in the preceding sentence, shall, insofar as they are applicable to
the VICO Contract Gas, be disbursed to PERTAMINA and each Contractor in
accordance with its Production Sharing Percentage at a bank or banks of its
choice.

         6.4 Contractors' Right to Payment. The right of Contractors to the
payments provided for in this Article 6 shall extend throughout the term of
this Supply Agreement and shall not be affected by the production rates or
sources of Natural Gas supplied from the VICO Contract Gas or the Other
Contract Gas from time to time during the term hereof.


                                   ARTICLE 7
                                 DELIVERABILITY

         7.1 Oversupply of VICO Contract Gas. If the quantities of net Natural
Gas produced from the participating fields within the VICO Contract Area and
delivered pursuant to this Supply Agreement exceed in the aggregate the
quantity of the VICO Contract Gas, the Producers' Percentage (and the
percentage of the revenues to be paid to PERTAMINA and Contractors hereunder)
will not be increased, and Contractors, together with PERTAMINA, will be
credited with and have the right to receive revenue from future marketing
opportunities in respect of a quantity of net Natural Gas from reserves in the
Other Contract Areas equal to such excess quantities.

         7.2 Shortfall of VICO Contract Gas. If the quantities of net Natural
Gas produced from the participating fields within the VICO Contract Area and
delivered pursuant to this Supply Agreement are in the aggregate less than the
quantity of the VICO Contract Gas, the Producers' Percentage (and the
percentage of the revenues to be paid to PERTAMINA and Contractors hereunder)
will not be reduced, and the production sharing contractors in the Other
Contract Areas


                                     - 9 -

<PAGE>   11



and any new contract area, together with PERTAMINA, will be credited with and
have the right to receive revenue from future marketing opportunities in
respect of a quantity of net Natural Gas from reserves in the VICO Contract
Area equal to excess quantities delivered from sources within the Gas Supply
Area.


                                   ARTICLE 8
                         ARBITRATION AND GOVERNING LAW

         8.1 Arbitration. All disputes arising in connection with this Supply
Agreement shall be finally settled by arbitration conducted in the English
language in Paris, France, by three arbitrators under the Rules of Arbitration
of the International Chamber of Commerce. Judgment upon the award rendered may
be entered in any court having jurisdiction, or application may be made to such
court for a juridical acceptance of the award and an order of enforcement, as
the case may be.

         8.2 Governing Law. This Supply Agreement shall be governed by and
interpreted in accordance with the laws of the State of New York, United States
of America.


                                   ARTICLE 9
                          CONTRACTORS' REPRESENTATIVE

         VICO is designated representative by Contractors for performance on
behalf of Contractors of their obligation under Section 4.1 hereof and for the
giving of notices, responses or other communications to and from Contractors
under this Supply Agreement. Such representative may be changed by written
notice to such effect from Contractors to PERTAMINA.



                                     - 10 -

<PAGE>   12



                                   ARTICLE 10
                                    NOTICES

         Any notices to the parties shall be in writing and sent by mail,
cable, telex or facsimile to the following addresses:

         To PERTAMINA:

         PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA
         (PERTAMINA)
         Jalan Medan Merdeka Timur 1 A
         Jakarta, Indonesia
         Attention:  Head of BPPKA

         Cable:  PERTAMINA, Jakarta, Indonesia
         Telex:  PERTAMINA, 44134 Jakarta
         Facsimile:  3846932


         To Contractors:

         VIRGINIA INDONESIA COMPANY (VICO)
         6th Floor, Kuningan Plaza
         South Tower
         Jl. H.R. Rasuna Said Kav. C11-14
         P.O. Box 2828
         Jakarta Selatan, Indonesia
         Attention:  President - VICO Indonesia

         Cable:  VICO
         Telex:  62458 or 62468
         Facsimile:  523-6100


                                     - 11 -

<PAGE>   13




         cc:            VIRGINIA INDONESIA COMPANY
                        One Houston Center
                        1221 McKinney
                        Suite 700
                        P.O. Box 1551
                        Houston, Texas 77251-1551
                        U.S.A.
                        Attention:  Chairman

                        Telex:  166-100
                        Facsimile:  (713) 754-6698

A party may change its address by written notice to the other parties.


                                   ARTICLE 11
                                 MISCELLANEOUS

         11.1 Amendment. This Supply Agreement shall not be amended or modified
except by written agreement signed by the parties hereto.

         11.2 Successors and Assigns. This Supply Agreement shall inure to the
benefit of, and be binding upon, PERTAMINA and each Contractor, their
respective successors and assigns, provided that this Supply Agreement shall be
assignable by a Contractor only if such Contractor concurrently assigns to the
same assignee an equal interest in the Production Sharing Contracts.

         11.3 Exclusivity. The parties to this Supply Agreement shall be the
only persons or entities entitled to enforce the obligations hereunder of the
other parties hereto, and no persons or entities not parties to this Supply
Agreement shall have the right to enforce any of the obligations hereunder of
any of the parties hereto.



                                     - 12 -

<PAGE>   14



         11.4 Headings and Subheadings. The Article headings and subheadings
used herein are for convenience of reference only.


         IN WITNESS WHEREOF, PERTAMINA and Contractors have caused their duly
authorized representatives to execute this Supply Agreement as of the day and
year first written above.



PERUSAHAAN PERTAMBANGAN MINYAK                  CONTRACTORS:
DAN GAS BUMI NEGARA (PERTAMINA)
                                                VIRGINIA INDONESIA COMPANY



BY /s/ [ILLEGIBLE]                              BY /s/ [ILLEGIBLE]
  -----------------------------                    -----------------------------


                                                LASMO SANGA SANGA LIMITED



                                                BY /s/ [ILLEGIBLE]
                                                   -----------------------------



                                                OPICOIL HOUSTON, INC.



                                                BY /s/ [ILLEGIBLE]
                                                   -----------------------------



                                                UNION TEXAS EAST KALIMANTAN
                                                LIMITED



                                                BY /s/ J.E. KNIGHT
                                                   -----------------------------
                                                   Vice President



                                                UNIVERSE GAS & OIL COMPANY, INC.



                                                BY /s/ [ILLEGIBLE]
                                                   -----------------------------




                                                VIRGINIA INTERNATIONAL COMPANY



                                                BY /s/ [ILLEGIBLE]
                                                   -----------------------------




                                     - 13 -


<PAGE>   1
                            MEMORANDUM OF AGREEMENT



                                    between



                                   PERTAMINA



                                      and



                         CHINESE PETROLEUM CORPORATION



                                      for



                            SALE AND PURCHASE OF LNG



                              during 1998 and 1999






                        Effective as of December 6, 1994



<PAGE>   2



This Memorandum of Agreement ("Agreement"), dated and effective as of December
6, 1994, is made by and between PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI
NEGARA ("PERTAMINA") and CHINESE PETROLEUM CORPORATION ("CPC"), for the sale
and purchase of certain quantities of LNG as described below. PERTAMINA and CPC
are collectively referred to herein as the "Parties".

WHEREAS, PERTAMINA and CPC are parties to the Badak III LNG Sales Contract, and
certain Side Letters and a Disputed Force Majeure Account Agreement, all dated
and effective as of March 19, l987 (collectively, the "Badak III LNG Sales
Contract") which are in full force and effect and which are unaffected by this
Agreement; and

WHEREAS, PERTAMINA desires to sell and CPC desires to purchase quantities of
LNG in addition to the quantities to be purchased under the terms of the Badak
III LNG Sales Contract.

NOW, THEREFORE, in consideration of the mutual promises contained herein, the
Parties agree as follow:


                                ARTICLE I - TERM

This Agreement shall be effective as of the date first above written. The term
shall commence on January 1, 1998 and terminate on December 31, l999.


                             ARTICLE II - QUANTITY

(a) During the term of this Agreement, PERTAMINA shall sell and deliver to CPC
into its Receiving Facility at the Unloading Port and CPC shall purchase,
receive and pay for approximately 46,400 billion BTU's of LNG equivalent to
sixteen (16) cargo lots. Approximately


                                       1

<PAGE>   3



8,700 billion BTU's of LNG, equivalent to three (3) cargo lots, shall be
delivered and taken during calendar year 1998 and approximately 37,700 billion
BTU's of LNG, equivalent to thirteen (13) cargo lots, shall be delivered and
taken during calendar year 1999.

(b) The Parties shall take all necessary actions to provide, as far as
reasonably possible, for even offtakes and deliveries of LNG under the terms of
this Agreement giving due consideration to the schedule of deliveries under the
terms of the Badak III LNG Sales Contract and other long term obligations of
PERTAMINA.


                              ARTICLE III - PRICE

The Contract Sales Price for the LNG delivered under this Agreement, expressed
in U.S. Dollars per million British Thermal Units (U.S.$/MMBTU), shall be the
sum of an LNG related component ("LNG Related Component") and a transportation
related component ("Transportation Related Component").

The LNG Related Component shall be 0.159 REP, where REP is the arithmetic
average of the realized export prices, in U.S. Dollars per barrel, F.O.B.
Indonesia, of all field classifications of Indonesian crude oils (including
condensate) then being sold and exported, except premium and except such prices
for spot sales.

The Transportation Related Component shall be U.S.$0.58/MMBTU as at January 1,
1994 escalated at 2.5% per annum thereafter; provided that if a cargo of LNG
sold and purchased hereunder is transported on an LNG tanker other than the
Dedicated Vessel or the Dwiputra, and if PERTAMINA's cost for such LNG tanker
is lower than the Transportation Related Component, then the parties will
consult with a view to agreeing on an appropriate adjustment of the
Transportation Related Component to apply to such cargo.



                                       2

<PAGE>   4



                          ARTICLE IV - TRANSPORTATION

LNG sold and purchased hereunder may be transported on the Dedicated Vessel, or
on the Dwiputra, or on any other LNG tanker PERTAMINA decides to use, subject
to such LNG tanker being compatible with the Receiving Facility and having the
required port clearance authorizations and approvals from the R.O.C. and any
other relevant authorities. The Parties shall use their respective best efforts
to obtain such authorizations and approvals for such LNG tankers.


                          ARTICLE V - SOURCE OF SUPPLY

The Natural Gas to be processed into LNG and sold and delivered hereunder is to
be produced from the areas in East Kalimantan covered by production sharing
contracts between PERTAMINA and its relevant suppliers, and loaded at
PERTAMINA's facility at Bontang, East Kalimantan.


                   ARTICLE VI - GENERAL TERMS AND CONDITIONS

(a) All of the terms and conditions of the Badak III LNG Sales Contract ,
except for Article 7 thereof, shall apply, mutatis mutandis, to and be
incorporated in this Agreement. Any Implementation Procedure agreed between
PERTAMINA and CPC in relation to the Badak III LNG Sales Contract shall also
apply, mutatis mutandis, to the sale and purchase of LNG pursuant to this
Agreement.

(b) In the event of any conflict between the applicable terms and conditions of
the Badak III LNG Sales Contract and the terms and conditions of this
Agreement, the terms and conditions of this Agreement shall prevail.



                                       3

<PAGE>   5


(c) Capitalized terms used herein shall have the same meaning as set forth in
the Badak III LNG Sales Contract unless otherwise specifically defined herein.


IN WITNESS WHEREOF, PERTAMINA and CPC have caused this Agreement to be entered
into by their respective duly authorized representatives as of the date first
above written.




PERUSAHAAN PERTAMBANGAN                       CHINESE PETROLEUM CORPORATION
MINYAK DAN GAS BUMI NEGARA                    (CPC)
(PERTAMINA)



/s/ F. ABDA'OE                                /s/ T.Y. CHANG
- ------------------------------------          ----------------------------------
By    :  F. Abda'oe                           By :  T.Y. Chang
Title :  President Director & C.E.O.          Title : Chairman of the Board



                                       4

<PAGE>   1

                           PACKAGE V SUPPLY AGREEMENT

             (1998-1999 LNG SALES TO CHINESE PETROLEUM CORPORATION)


                                    between


                                   PERTAMINA


                                      and


                           VIRGINIA INDONESIA COMPANY
                           LASMO SANGA SANGA LIMITED
                             OPICOIL HOUSTON, INC.
                      UNION TEXAS EAST KALIMANTAN LIMITED
                        UNIVERSE GAS & OIL COMPANY, INC.
                                      and
                         VIRGINIA INTERNATIONAL COMPANY




                          Dated: June 16, 1995
                          Effective: December 6, 1994




<PAGE>   2



                           PACKAGE V SUPPLY AGREEMENT
             (1998-1999 LNG SALES TO CHINESE PETROLEUM CORPORATION)

         THIS SUPPLY AGREEMENT, made and entered into in Jakarta on June 16,
1995, by and between PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA
("PERTAMINA"), on the one hand, and VIRGINIA INDONESIA COMPANY ("VICO"), LASMO
SANGA SANGA LIMITED, OPICOIL HOUSTON, INC., UNION TEXAS EAST KALIMANTAN
LIMITED, UNIVERSE GAS & OIL COMPANY, INC., and VIRGINIA INTERNATIONAL COMPANY
(herein referred to collectively as "Contractors" and individually as
"Contractor"), on the other hand,

                                  WITNESSETH:

         A. WHEREAS, Contractors individually own or control all of the
interest of "Contractors" in that certain Amended and Restated Production
Sharing Contract, dated April 23, 1990, but effective as of August 8, 1968
(such contract as hereafter amended is herein referred to as the "Amended and
Restated Production Sharing Contract") and that certain Production Sharing
Contract dated April 23, 1990, but effective as of August 8, 1998 (such
contract as hereafter amended is herein referred to as the "Renewed Production
Sharing Contract"). The Amended and Restated Production Sharing Contract and
the Renewed Production Sharing Contract are herein referred to collectively as
the "Production Sharing Contracts" and the area covered thereby is herein
referred to as the "VICO Contract Area"; and

         B. WHEREAS, pursuant to the Production Sharing Contracts, each of
PERTAMINA and Contractors is entitled to take and receive, sell and freely
export its respective share of the Natural Gas produced and saved from the VICO
Contract Area (the percentage share of such Natural Gas to which each of
PERTAMINA and Contractors is entitled, as determined under the Production
Sharing Contracts, is herein referred to as the "Production Sharing Percentage"
of such party); and

<PAGE>   3



         C. WHEREAS, the reserves of Natural Gas in the VICO Contract Area
exceed the reserves of Natural Gas committed to be produced, supplied and
delivered by PERTAMINA and Contractors to meet a portion of PERTAMINA's
existing obligations under LNG sales contracts, LPG sales contracts, and
domestic gas sales contracts; and

         D. WHEREAS, PERTAMINA, with assistance from Contractors, has
constructed and expanded and is further expanding the Natural Gas liquefaction
and related facilities located at Bontang Bay, on the east coast of Kalimantan,
Indonesia (herein referred to as the "Bontang Plant"); and

         E. WHEREAS, funds for the expansion of the liquefaction plant will be
provided to PERTAMINA through financing of the cost of such expansion on terms,
mutually agreeable to PERTAMINA and Contractors, which provide for the
repayment of funds provided pursuant to such financing and the cost of such
funds (repayment of funds and the cost of such funds are hereinafter referred
to as "Financing Costs"); and

         F. WHEREAS, PERTAMINA and Contractors are parties to the Amended and
Restated Bontang Processing Agreement dated as of February 9, 1988 (as from
time to time amended, the "Processing Agreement"), which provides for the
operation of the Bontang Plant and the payment of the costs of such operation
(such costs as determined in accordance with the Processing Agreement are
herein referred to as "Plant Operating Costs"); and

         G. WHEREAS, PERTAMINA and Contractors have agreed to use the Bontang
Plant in part for the liquefaction of the VICO Contract Gas (as defined in
Section 2.2 hereof) and the Other Contract Gas (as defined in Section 2.3
hereof); and

         H. WHEREAS, PERTAMINA, in collaboration with Contractors and its
production sharing contractors in other contract areas in East Kalimantan
(herein referred to as the "Other Contract Areas"), has entered into a
Memorandum of Agreement dated December 6, 1994 ("MOA", and unless otherwise so
stated, any terms defined in the MOA shall have the same meanings when


                                     - 2 -

<PAGE>   4



used herein) with Chinese Petroleum Corporation ("Buyer") pursuant to which
PERTAMINA is obligated to sell to Buyer certain quantities of LNG on an ex ship
basis; and

         I. WHEREAS, the MOA provides that the Natural Gas to be processed into
LNG and sold by PERTAMINA under the MOA is to be produced from the areas in
East Kalimantan covered by production sharing contracts between PERTAMINA and
its suppliers, which consists of the VICO Contract Area and the Other Contract
Areas; and

         J. WHEREAS, arrangements for the transportation of the ex ship
quantities pursuant to the MOA and for the payment of costs respecting such
transportation will be made on terms mutually agreeable to PERTAMINA and
Contractors (herein referred to as "Transportation Costs"); and

         K. WHEREAS, PERTAMINA and each Contractor desire to supply and deliver
Natural Gas from the VICO Contract Area in support of the performance by
PERTAMINA of an agreed portion of its obligations under the MOA; and

         L. WHEREAS, each Contractor desires to dispose of its Production
Sharing Percentage of the VICO Contract Gas (as herein defined) in accordance
with the terms of this Supply Agreement,

         NOW, THEREFORE, the parties agree as follows:


                                   ARTICLE 1
                          EFFECTIVE DATE AND DURATION

         This Supply Agreement shall be effective as of December 6, 1994, and
shall terminate on the date when all rights and obligations of Contractors
hereunder have been satisfied.



                                     - 3 -

<PAGE>   5



                                   ARTICLE 2
                         SUPPLY COMMITMENT AND QUANTITY

         2.1 Net Gas Requirement. The total quantity of net Natural Gas
required to be supplied and delivered out of proved recoverable reserves of
Natural Gas in East Kalimantan for liquefaction and sale as LNG under the MOA
is estimated to be 0.0482 trillion standard cubic feet ("t.s.c.f."). Such
quantity is herein referred to as the "MOA Net Gas Requirement". The MOA Net
Gas Requirement is based on the Fixed Quantities which Buyer has committed to
purchase pursuant to the terms of the MOA.

         2.2 VICO Contract Gas. PERTAMINA and Contractors hereby commit and
agree to supply and deliver from proved economically recoverable reserves of
Natural Gas in specific fields within the VICO Contract Area sufficient Natural
Gas (and LNG resulting from the liquefaction thereof) to meet a portion of the
MOA Net Gas Requirement over the term of this Supply Agreement consisting of
0.0104 t.s.c.f., or 21.5956% thereof. Such quantities of net Natural Gas
committed to be supplied pursuant to this Supply Agreement are herein referred
to as the "VICO Contract Gas", and the above-stated percentage is herein
referred to as the "Producers' Percentage". The specific fields from which the
VICO Contract Gas will be committed are identified in the supplemental
memorandum entered into among PERTAMINA, Contractors and the production sharing
contractors in the Other Contract Areas pursuant to the Memorandum of
Understanding Re: Supply Agreements and Package V Sales dated October 5, 1994
(the "Package V Supplemental Memorandum"). The VICO participating fields and
the quantities in each field comprising the VICO Contract Gas are as follows:

<TABLE>
<CAPTION>
         Participating Fields               Quantity of Gas (t.s.c.f.)
         --------------------               --------------------------
               <S>                          <C>
               Badak                                  0.0034
               Lampake                                0.0003
               Mutiara                                0.0014
               Nilam                                  0.0036
               Pamaguan                               0.0000
               Semberah                               0.0016
</TABLE>



                                     - 4 -

<PAGE>   6




The quantities committed from each field are subject to revision from time to
time, as the reserves from the fields may be updated and as additional data,
from deliverability studies and otherwise, become available.

         2.3 Other Contract Gas. To meet the balance of the MOA Net Gas
Requirement, constituting 0.0378 t.s.c.f., or 78.4044% thereof, sufficient
Natural Gas (and LNG resulting from the liquefaction thereof) will be committed
for supply and delivery by PERTAMINA and its production sharing contractors
from proved economically recoverable reserves of Natural Gas in the Other
Contract Areas by separate supply agreements, similar hereto and compatible
herewith, executed and delivered concurrently herewith (such amounts are herein
collectively referred to as the "Other Contract Gas"). The specific fields from
which the Other Contract Gas will be committed are also identified in the
Package V Supplemental Memorandum.

         2.4 DeGolyer and MacNaughton Certification. The amounts of net Natural
Gas constituting the VICO Contract Gas and the Other Contract Gas are part of
the estimates of proved recoverable reserves of Natural Gas as certified by the
independent consultant firm of DeGolyer and MacNaughton in written statements
based on data available on May 31, 1994.

         The quantities for the VICO Contract Gas and the Other Contract Gas
set forth in Sections 2.2 and 2.3 hereof and the Producers' Percentage were
established by PERTAMINA at a meeting on May 29, 1995 of the East Kalimantan
Gas Reserves Management Committee.


                                   ARTICLE 3
                           COORDINATION OF GAS SUPPLY

         The VICO Contract Gas and the Other Contract Gas may be produced from
participating fields at times and production rates which may change from time
to time during the term hereof so as to secure the optimal ultimate recovery of
Natural Gas. The supply of Natural Gas from the VICO


                                     - 5 -

<PAGE>   7



Contract Area and the Other Contract Areas will be coordinated by PERTAMINA so
as to conserve and permit full utilization of such Natural Gas. The sources of
supply, producing rates, quality of gas, metering and related matters shall be
matters for study by the East Kalimantan Gas Reserves Management Committee,
consisting of representatives from PERTAMINA, VICO, TOTAL Indonesie and Unocal
Indonesia Company.


                                   ARTICLE 4
                   ADMINISTRATION, INSURANCE AND CONSULTATION

         4.1 MOA. PERTAMINA shall be responsible for the due and prompt
administration of the MOA for the benefit of PERTAMINA and Contractors. All
matters which affect the MOA or the sale, transportation and delivery of LNG
thereunder will be administered by a representative to be appointed by
PERTAMINA and the representative appointed by Contractors under Article 9
hereof. It is understood, however, that it will be necessary from time to time
for PERTAMINA, as seller under the MOA, to take certain administrative and
operational actions without prior consultation where immediate action is
required. Contractors will be promptly advised of any such action.

         4.2 Insurance. PERTAMINA shall ensure that the interests of it and
each Contractor in respect of each cargo of LNG transported by PERTAMINA from
the Bontang Plant to Buyer shall be adequately insured pursuant to arrangements
mutually agreed to by PERTAMINA and each Contractor. PERTAMINA and each
Contractor shall be entitled to receive its Production Sharing Percentage of
the Producers' Percentage of any proceeds paid under a marine insurance policy
covering a cargo of LNG being transported from the Bontang Plant. Such proceeds
shall be remitted by the insurer directly to the bank designated as Trustee
pursuant to Article 6 hereof.

         4.3 Consultation. PERTAMINA and Contractors agree to consult with each
other freely on all matters relating to the MOA. PERTAMINA and Contractors
shall confer and agree as to any amendment to the MOA or to any permitted
action or election thereunder which constitutes


                                     - 6 -

<PAGE>   8



a material adjustment in the quantities of LNG to be sold and delivered
thereunder or a change in the terms thereof. At the request of any party
hereto, a memorandum evidencing any such agreement shall be prepared as soon as
feasible and signed by each party hereto.


                                   ARTICLE 5
                         TITLE, DELIVERY AND INVOICING

         5.1 Title. PERTAMINA will cause the LNG resulting from the
liquefaction of the VICO Contract Gas and the Other Contract Gas to be
delivered to Buyer at the "Delivery Point" as that term is defined in the MOA.
Title to each Contractor's share of the LNG resulting from the liquefaction of
the VICO Contract Gas shall pass to PERTAMINA at the same time as the passage
of title from PERTAMINA to Buyer pursuant to the MOA.

         5.2 Delivery and Invoicing. At the time of delivery of each cargo of
LNG to Buyer at the relevant "Delivery Point", PERTAMINA will furnish
Contractors with appropriate documentation to evidence the quantity and quality
of LNG delivered, together with copies of the invoices to Buyer in respect of
the sale of LNG in question. PERTAMINA will also furnish Contractors with a
copy of each invoice or billing delivered to Buyer on account of interest or
other payment obligation of Buyer pursuant to the MOA concurrently with its
being furnished to Buyer. Calculation of the Contract Sales Price as provided
for in the MOA, the amount of sales invoices and other billings to Buyer, and
any adjustments, shall be reviewed and approved by PERTAMINA and Contractors
prior to presentation to Buyer.





                                     - 7 -

<PAGE>   9

                                   ARTICLE 6
                            ENTITLEMENT AND PAYMENT

         6.1 Contractor Entitlement. The amounts to be paid to each Contractor
for its share of the LNG resulting from the liquefaction of Natural Gas to be
supplied under this Supply Agreement shall be its Production Sharing Percentage
of the Producers' Percentage of the sum of:

         (a) all amounts to be paid by Buyer to PERTAMINA for LNG sold and 
delivered under the MOA;

         (b) all other amounts which Buyer shall become obligated to pay
pursuant to the MOA with regard to deliveries of LNG thereunder including, but
not limited to any interest accruing on overdue invoice payments;

         (c) amounts payable by insurers in respect of LNG resulting from the
liquefaction of the VICO Contract Gas and the Other Contract Gas; and

         (d) interest earned on any of the amounts referred to in this Section
6.1.

         6.2 PERTAMINA Assignment of Contractor Percentage Share. In order to
arrange for the receipt by each Contractor of the payments to which such
Contractor is entitled under Section 6.1 hereof, PERTAMINA hereby assigns to
each Contractor that Contractor's Production Sharing Percentage of the
Producers' Percentage of all amounts referred to in Section 6.1 hereof.

         6.3 Method of Payment. Throughout the term of this Supply Agreement,
all those payments referred to in Section 6.1 hereof shall be paid in U.S.
Dollars, directly to BankAmerica International in New York City (or such other
leading bank in the United States as shall be selected by PERTAMINA and
approved by Contractors) pursuant to a Trustee and Paying Agent Agreement, the
parties to which shall be PERTAMINA, Contractors, the production sharing
contractors in the Other Contract Areas and the Trustee thereunder. Amounts so
received by the Trustee shall be used for payment of (i) Financing Costs; (ii)
an agreed portion of Plant Operating Costs; (iii)


                                     - 8 -

<PAGE>   10



Transportation Costs; and (iv) other costs approved by PERTAMINA and
Contractors. Amounts received by the Trustee, to the extent that they are not
used for payment of the costs referred to in the preceding sentence, shall,
insofar as they are applicable to the VICO Contract Gas, be disbursed to
PERTAMINA and each Contractor in accordance with its Production Sharing
Percentage at a bank or banks of its choice.

         6.4 Contractors' Right to Payment. The right of Contractors to the
payments provided for in this Article 6 shall extend throughout the term of
this Supply Agreement and shall not be affected by the production rates or
sources of Natural Gas supplied from the VICO Contract Gas or the Other
Contract Gas from time to time during the term hereof.


                                   ARTICLE 7
                                 DELIVERABILITY

         7.1 Oversupply of VICO Contract Gas. If the quantities of net Natural
Gas produced from the participating fields within the VICO Contract Area and
delivered pursuant to this Supply Agreement exceed in the aggregate the
quantity of the VICO Contract Gas, the Producers' Percentage (and the
percentage of the revenues to be paid to PERTAMINA and Contractors hereunder)
will not be increased, and Contractors, together with PERTAMINA, will be
credited with and have the right to receive revenue from future marketing
opportunities in respect of a quantity of net Natural Gas from reserves in the
Other Contract Areas equal to such excess quantities.

         7.2 Shortfall of VICO Contract Gas. If the quantities of net Natural
Gas produced from the participating fields within the VICO Contract Area and
delivered pursuant to this Supply Agreement are in the aggregate less than the
quantity of the VICO Contract Gas, the Producers' Percentage (and the
percentage of the revenues to be paid to PERTAMINA and Contractors hereunder)
will not be reduced, and the production sharing contractors in the Other
Contract Areas and any new contract area, together with PERTAMINA, will be
credited with and have the right to receive revenue from future marketing
opportunities in respect of a quantity of net Natural Gas from


                                     - 9 -

<PAGE>   11



reserves in the VICO Contract Area equal to excess quantities delivered from
sources within the Gas Supply Area.


                                   ARTICLE 8
                         ARBITRATION AND GOVERNING LAW

         8.1 Arbitration. All disputes arising in connection with this Supply
Agreement shall be finally settled by arbitration conducted in the English
language in Paris, France, by three arbitrators under the Rules of Arbitration
of the International Chamber of Commerce. Judgment upon the award rendered may
be entered in any court having jurisdiction, or application may be made to such
court for a juridical acceptance of the award and an order of enforcement, as
the case may be.

         8.2 Governing Law. This Supply Agreement shall be governed by and
interpreted in accordance with the laws of the State of New York, United States
of America.


                                   ARTICLE 9
                          CONTRACTORS' REPRESENTATIVE

         VICO is designated representative by Contractors for performance on
behalf of Contractors of their obligation under Section 4.1 hereof and for the
giving of notices, responses or other communications to and from Contractors
under this Supply Agreement. Such representative may be changed by written
notice to such effect from Contractors to PERTAMINA.



                                     - 10 -

<PAGE>   12



                                   ARTICLE 10
                                    NOTICES

         Any notices to the parties shall be in writing and sent by mail,
cable, telex or facsimile to the following addresses:

         To PERTAMINA:

         PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA
         (PERTAMINA)
         Jalan Medan Merdeka Timur 1 A
         Jakarta, Indonesia
         Attention:  Head of BPPKA

         Cable:  PERTAMINA, Jakarta, Indonesia
         Telex:  PERTAMINA, 44134 Jakarta
         Facsimile:  3846932


         To Contractors:

         VIRGINIA INDONESIA COMPANY (VICO)
         6th Floor, Kuningan Plaza
         South Tower
         Jl. H.R. Rasuna Said Kav. C11-14
         P.O. Box 2828
         Jakarta Selatan, Indonesia
         Attention:  President - VICO Indonesia

         Cable:  VICO
         Telex:  62458 or 62468
         Facsimile:  523-6100


                                     - 11 -

<PAGE>   13




         cc:            VIRGINIA INDONESIA COMPANY
                        One Houston Center
                        1221 McKinney
                        Suite 700
                        P.O. Box 1551
                        Houston, Texas 77251-1551
                        U.S.A.
                        Attention:  Chairman

                        Telex:  166-100
                        Facsimile:  (713) 754-6698

A party may change its address by written notice to the other parties.


                                   ARTICLE 11
                                 MISCELLANEOUS

         11.1 Amendment. This Supply Agreement shall not be amended or modified
except by written agreement signed by the parties hereto.

         11.2 Successors and Assigns. This Supply Agreement shall inure to the
benefit of, and be binding upon, PERTAMINA and each Contractor, their
respective successors and assigns, provided that this Supply Agreement shall be
assignable by a Contractor only if such Contractor concurrently assigns to the
same assignee an equal interest in the Production Sharing Contracts.

         11.3 Exclusivity. The parties to this Supply Agreement shall be the
only persons or entities entitled to enforce the obligations hereunder of the
other parties hereto, and no persons or entities not parties to this Supply
Agreement shall have the right to enforce any of the obligations hereunder of
any of the parties hereto.

         11.4 Headings and Subheadings. The Article headings and subheadings
used herein are for convenience of reference only.


                                     - 12 -

<PAGE>   14




         IN WITNESS WHEREOF, PERTAMINA and Contractors have caused their duly
authorized representatives to execute this Supply Agreement as of the day and
year first written above.



PERUSAHAAN PERTAMBANGAN MINYAK                 CONTRACTORS:
DAN GAS BUMI NEGARA (PERTAMINA)                
                                               VIRGINIA INDONESIA COMPANY



BY /s/ [ILLEGIBLE]                             BY /s/ [ILLEGIBLE]
   -----------------------------                  ------------------------------




                                               LASMO SANGA SANGA LIMITED
                                               
                                               
                                               
                                               BY /s/ [ILLEGIBLE]
                                                  ------------------------------
                                               
                                               
                                               OPICOIL HOUSTON, INC.
                                               
                                               
                                               
                                               BY /s/ [ILLEGIBLE]
                                                  ------------------------------
                                               
                                               
                                               
                                               UNION TEXAS EAST KALIMANTAN
                                               LIMITED
                                               
                                               
                                               
                                               BY /s/ J.E. KNIGHT
                                                  ------------------------------
                                                  Vice President
                                               
                                               
                                               
                                               UNIVERSE GAS & OIL COMPANY, INC.
                                               
                                               
                                               
                                               BY /s/ [ILLEGIBLE]
                                                  ------------------------------
                                               
                                               
                                               
                                               
                                               VIRGINIA INTERNATIONAL COMPANY
                                               
                                               
                                               
                                               BY /s/ [ILLEGIBLE]
                                                  ------------------------------




                                    - 13 -
                                       

<PAGE>   1
                                  TRUST UNDER

              THE UNION TEXAS PETROLEUM DEFERRED COMPENSATION PLAN


     This AGREEMENT, made this 1st day of October, 1997, by and between UNION
TEXAS PETROLEUM HOLDINGS, INC., a Delaware corporation (the "Company"), and
VANGUARD FIDUCIARY TRUST COMPANY, a trust company incorporated under Chapter 10
of the Pennsylvania Banking Code ("Trustee").

                                  WITNESSETH:

     WHEREAS, the Company has adopted the UNION TEXAS PETROLEUM DEFERRED
COMPENSATION PLAN (the "Plan");

     WHEREAS, the Company has incurred or expects to incur liability under the
terms of such Plan with respect to the individuals participating in such Plan;

     WHEREAS, the Company wishes to establish a trust (hereinafter called
"Trust") and to contribute to the Trust assets that shall be held therein,
subject to the claims of Company's creditors in the event of Company's
Insolvency, as herein defined, until paid to Plan participants and their
beneficiaries in such manner and at such times as specified in the Plan;

     WHEREAS, it is the intention of the parties that this Trust shall
constitute an unfunded arrangement and shall not affect the status of the Plan
as an unfunded plan maintained for the purpose of providing deferred
compensation for a select group of management or highly compensated employees
for purposes of Title I of the Employee Retirement Income Security Act of 1974,
as amended;
<PAGE>   2
     WHEREAS, it is the intention of Company to make contributions to the Trust
to provide itself with a source of funds to assist it in the meeting of its
liabilities under the Plan;

     NOW, THEREFORE, the parties do hereby establish the Trust and agree that
the Trust shall be comprised, held and disposed of as follows;

SECTION 1. Establishment of Trust.

     (a) The Company shall from time to time deposit amounts with Trustee in
trust which shall become the principal of the Trust to be held, administered
and disposed of by Trustee as provided in this Trust Agreement.

     (b) The Trust hereby established shall be irrevocable.

     (c) The Trust is intended to be a grantor trust, of which Company is the
grantor, within the meaning of subpart E, part I, subchapter J, chapter 1,
subtitle A of the Internal Revenue Code of 1986, as amended, and shall be
construed accordingly.

     (d) The principal of the Trust, and any earnings thereon shall be held
separate and apart from other funds of Company and shall be used exclusively
for the uses and purposes of Plan participants and general creditors as herein
set forth. Plan participants and their beneficiaries shall have no preferred
claim on, or any beneficial ownership interest in, any assets of the Trust. 
Any rights created under the Plan and this Trust Agreement shall be mere
unsecured contractual rights of Plan participants and their beneficiaries
against Company. Any assets held by the Trust will be subject to the claims of
Company's general creditors under federal and state law in the event of
insolvency, as defined in Section 3(a) herein.

     (e) Company, in its sole discretion, may at any time, or from time to time,
make additional deposits of cash or other property in trust with Trustee to
augment the principal to be held, administered and disposed of by Trustee as
provided in this Trust Agreement. Neither Trustee nor any Plan participant or
beneficiary shall have any right to compel such additional deposits.

                                       2
<PAGE>   3
SECTION 2. Payments to Plan Participants and Their Beneficiaries

     (a) Company shall deliver to Trustee a schedule (the "Payment Schedule")
that indicates the amounts payable in respect of each Plan participant (and his
or her beneficiaries), that provides a formula or other instructions acceptable
to Trustee for determining the amounts so payable, the form in which such
amount is to be paid (as provided for or available under the Plan), and the
time of commencement for payment of such amounts. Except as otherwise provided
herein, Trustee shall make payments to the Plan participants and their
beneficiaries in accordance with such Payment Schedule. The Trustee shall make
provision for the reporting and withholding of any federal, state or local
taxes that may be required to be withheld with respect to the payment of
benefits pursuant to the terms of the Plan and shall pay amounts withheld to
the appropriate taxing authorities or determine that such amounts have been
reported, withheld and paid by Company.

     (b) The entitlement of a Plan participant or his or her beneficiaries to
benefits under the Plan shall be determined by Company or such party as it
shall designate under the Plan, and any claim for such benefits shall be
considered and reviewed under the procedures set out in the Plan.

     (c) Company may make payment of benefits directly to Plan participants or
their beneficiaries as they become due under the terms of the Plan. Company
shall notify Trustee of its decision to make payment of benefits directly prior
to the time amounts are payable to participants or their beneficiaries. In
addition, if the principal of the Trust, and any earnings thereon, are not
sufficient to make payments of benefits in accordance with the terms of the
Plan, Company shall make the balance of each such payment as it falls due.
Trustee shall notify Company where principal and earnings are not sufficient.

SECTION 3. Trustee Responsibility Regarding Payments to Trust Beneficiary When
           Company is Insolvent

     (a) Trustee shall cease payment of benefits to Plan participants and their
beneficiaries if the Company is Insolvent. Company shall be considered
"Insolvent" for purposes of this Trust Agreement if (i) Company is unable to
pay its debts as they become due, or (ii) Company is subject to a pending
proceeding as a debtor under the United States Bankruptcy Code.

                                       3
<PAGE>   4
         (b) At all times during the continuance of this Trust, as provided in
Section 1(d) hereof, the principal and income of the Trust shall be subject to
claims of general creditors of Company under federal and state law as set forth
below.

                  (1) The Board of Directors and the Chief Executive Officer of
Company shall have the duty to inform Trustee in writing of Company's
Insolvency. If a person claiming to be a creditor of Company alleges in writing
to Trustee that Company has become Insolvent, Trustee shall determine whether
Company is Insolvent and, pending such determination, Trustee shall discontinue
payment of benefits to Plan participants or their beneficiaries.

                  (2) Unless Trustee has actual knowledge of Company's
Insolvency, or has received notice from Company or a person claiming to be a
creditor alleging that Company is Insolvent, Trustee shall have no duty to
inquire whether Company is Insolvent. Trustee may in all events rely on such
evidence concerning Company's solvency as may be furnished to Trustee and that
provides Trustee with a reasonable basis for making a determination concerning
Company's solvency.

                  (3) If at any time Trustee has determined that Company is
Insolvent, the Trustee shall discontinue payments to Plan participants or their
beneficiaries and shall hold the assets of the Trust for the benefit of
Company's general creditors. Nothing in this Trust Agreement shall in any way
diminish any rights of Plan participants or their beneficiaries to pursue their
rights as general creditors of Company with respect to benefits due under the
Plan or otherwise.

                  (4) Trustee shall resume the payment of benefits to Plan
participants or beneficiaries in accordance with Section 2 of this Trust
Agreement only after Trustee has determined that Company is not Insolvent (or
is no longer Insolvent).

         (c) Provided that there are sufficient assets, if Trustee discontinues
the payment of benefits from the Trust pursuant to subsection 3(b) hereof and
subsequently resumes such payments, the first payment following such
discontinuance shall include the aggregate amount of all payments due to Plan
participants or their beneficiaries under the terms of the Plan for the period
of such discontinuance, less the aggregate

                                       4
<PAGE>   5
amount of any payments made to Plan participants or their beneficiaries by
Company in lieu of the payments provided for hereunder during any such period
of discontinuance.

SECTION 4. Payments to Company.

     Except as provided in Section 3 hereof, after the Trust has become
irrevocable, Company shall have no right or power to direct Trustee to return
to Company or to divert to others any of the Trust assets before all payments
of benefits have been made to Plan participants and their beneficiaries
pursuant to the terms of the Plan.

SECTION 5. Investment Authority.

     (a) Trustee may invest in securities (including stock or rights to acquire
stock) or obligations issued by the Company. All rights associated with assets
of the Trust shall be exercised by Trustee or the person designated by Trustee,
and shall in no event be exercisable by the Company, except that voting rights
with respect to Trust assets will be exercised by the Company, and except that
dividend rights with respect to Trust assets will rest with the Company. Company
shall have the right at anytime, and from time to time in its sole discretion,
to substitute assets of equal fair market value for any asset held by the Trust.
This right is exercisable by the Company in a non-fiduciary capacity without the
approval or consent of any person in a fiduciary capacity.

     (b) The Trust shall be invested by the Trustee among any of the regulated
investment companies maintained by the Vanguard Group, Inc. which have been
previously designated as investment fund alternatives by the Company (the
"Investment Funds"). The Company shall notify the Trustee in writing of the
selection of the Investment Funds and any changes thereto. The Trustee shall
invest in the Trust in accordance with the written directions of the Company or
to the extent that such directions are not received for all or a portion of the
Trust, in the Trustee's discretion among any of the Investment Funds. The
Trustee shall have no liability or responsibility for acting without question on
the written direction of the Company, or for the exercise of investment
discretion in the absence of written direction from the Company, unless such
actions are contrary to the express provisions of this Trust Agreement. The
Company will indemnify the Trustee for liability to any party resulting from the
Trustee acting without question on the written direction of the Company, and for
liability to any party resulting from the exercise

                                       5
<PAGE>   6
of investment discretion in the absence of written investment direction from the
Company as to all or a portion of the Trust, unless such actions are contrary to
the express provisions of this Trust Agreement, such direction or are the result
of the Trustee's negligence or willful misconduct.

SECTION 6.  Disposition of Income.

     During the term of the Trust, all income received by the Trust, net of
expenses and taxes, shall be accumulated and reinvested.

SECTION 7.  Accounting by Trustee.

     Trustee shall keep accurate and detailed records of all investments,
receipts, disbursements, and all other transactions required to be made,
including such specific records as shall be agreed upon in writing between
Company and Trustee. Within one hundred and twenty (120) days following the
close of each calendar year and within one hundred and twenty (120) days after
the removal or resignation of Trustee, Trustee shall deliver to Company a
written account of its administration of the Trust during such year or during
the period from the close of the last preceding year to the date of such removal
or resignation, setting forth all investments, receipts, disbursements and other
transactions effected by it, including a description of all securities and
investments purchased and sold with the cost or net proceeds of such purchases
or sales (accrued interest paid or receivable being shown separately), and
showing all cash, securities and other property held in the Trust at the end of
such year or as of the date of such removal or resignation, as the case may be.

SECTION 8.  Responsibility of Trustee.

     (a)  Trustee shall act with the care, skill, prudence and diligence under
the circumstances then prevailing that a prudent person acting in like capacity
and familiar with such matters would use in the conduct of an enterprise of a
like character and with like aims, provided, however, that Trustee shall incur
no liability to any person for any action taken pursuant to a direction, request
or approval given by Company which is contemplated by, and in conformity with,
the terms of the Plan or this Trust and is given in writing by Company. In the
event of a dispute between Company and a party, Trustee may apply to a court of
competent jurisdiction to resolve the dispute.

                                       6
<PAGE>   7
         (b) If Trustee undertakes or defends any litigation against the Company
arising in connection with this Trust, Company agrees to indemnify Trustee
against Trustee's costs, expenses and liabilities (including, without
limitation, attorney's fees and expenses) relating thereto and to be primarily
liable for such payments. If Company does not pay such costs, expenses and
liabilities in a reasonably timely manner, Trustee may obtain payment from the
Trust except claims brought against the Company as a direct result of the
Trustee's negligence, willful misconduct, lack of good faith or breach of its
duties under this Agreement.

         (c) Trustee may consult with legal counsel (who may also be counsel
for Company generally) with respect to any of its duties or obligations
hereunder.

         (d) Trustee may hire agents, accountants, actuaries, investment
advisors, financial consultants or other professionals to assist it in
performing any of its duties or obligations hereunder.

         (e) Trustee shall have, without exclusion, all powers conferred on
Trustees by applicable law, unless expressly provided otherwise herein,
provided, however, that if an insurance policy is held as an asset of the
Trust, Trustee shall have no power to name a beneficiary of the policy other
than the Trust, to assign the policy (as distinct from conversion of the policy
to a different form) other than to a successor Trustee, or to loan to any
person the proceeds of any borrowing against such policy.

         (f) Notwithstanding any powers granted to Trustee pursuant to this
Trust Agreement or to applicable law, Trustee shall not have any power that
could give this Trust the objective of carrying on a business and dividing the
gains therefrom, within the meaning of section 301.7701-2 of the Procedure and
Administrative Regulations promulgated pursuant to the Internal Revenue Code.

         (g) Unless resulting from the Trustee's negligence, willful misconduct,
lack of good faith, or breach of its duties under this Agreement, the Company
shall indemnify and save harmless the Trustee from, against, for and in respect
of any and all damages, losses, obligations, liabilities, liens, deficiencies,
costs and expenses, including without limitation, reasonable attorney's fees
incident to any suit, action, investigation, claim or proceedings suffered,
sustained, incurred or required to be paid by the Trustee in


                                       7
<PAGE>   8
connection with the Plan or this Agreement. If Company does not pay such costs,
expenses and liabilities for which it is liable hereunder in a reasonably timely
manner, Trustee may obtain payment from the Trust.

SECTION 9.  Compensation and Expenses of Trustee.

     Company shall pay all administrative and Trustee's fees and expenses within
a reasonable period of time following the notice of such fees and expenses
provided to the Company. If not so paid, the fees and expenses shall be paid
from the Trust.

SECTION 10. Resignation and Removal of Trustee.  

     (a)  Trustee may resign at any time by written notice to Company, which
shall be effective thirty (30) days after receipt of such notice unless Company
and Trustee agree otherwise.

     (b)  Trustee may be removed by Company on thirty (30) days notice or upon
shorter notice accepted by Trustee.

     (c)  Upon resignation or removal of Trustee and appointment of a successor
Trustee, all assets shall subsequently be transferred to the successor Trustee.
The transfer shall be completed within ninety (90) days after receipt of notice
of resignation, removal or transfer, unless Company extends the time limit.

     (d)  If Trustee resigns or is removed, a successor shall be appointed, in
accordance with Section 11 hereof, by the effective date of resignation or
removal under paragraphs (a) or (b) of this section. If no such appointment has
been made, Trustee may apply to a court of competent jurisdiction for
appointment of a successor or for instructions. All expenses of Trustee in
connection with the proceeding shall be allowed as administrative expenses of
the Trust.

SECTION 11.  Appointment of Successor.

     (a)  If trustee resigns or is removed in accordance with Section 10(a) or
(b) hereof, Company may appoint any third party, such as a bank trust department
or other party that may be granted corporate 

                                       8
<PAGE>   9
trustee powers under state law, as a successor to replace Trustee upon
resignation or removal. The appointment shall be effective when accepted in
writing by the new trustee, who shall have all of the rights and powers of the
former Trustee, including ownership rights in the Trust assets. The former
Trustee shall execute any instrument necessary or reasonably requested by
Company or the successor trustee to evidence the transfer.

     (b) The successor trustee need not examine the records and acts of any
prior trustee and may retain or dispose of existing Trust assets, subject to
Section 7 and 8 hereof. The successor trustee shall not be responsible for and 
Company shall indemnify and defend the successor trustee from any claim or
liability resulting from any action or inaction of any prior trustee or from
any other past event or any condition existing at the time it becomes successor
trustee.

SECTION 12. Amendment or Termination

     (a) This Trust Agreement may be amended by a written instrument executed
by Trustee and Company. Notwithstanding the foregoing, no such amendment shall
conflict with the terms of the Plan or make the Trust revocable after it has
become irrevocable in accordance with Section 1(b) hereof.

     (b) The Trust shall not terminate until the date on which Plan
participants and their beneficiaries are no longer entitled to benefits pursuant
to the terms of the Plan. Upon termination of the Trust any assets remaining in
the Trust shall be returned to Company.

     (c) Upon written approval of participants or beneficiaries entitled to
payment of benefits pursuant to the terms of the Plan, Company may terminate
this Trust prior to the time all benefit payments under the Plan have been
made. All assets in the Trust at termination shall be returned to Company.

     SECTION 13. Miscellaneous

     (a) Any provision of this Trust Agreement prohibited by law shall be
ineffective to the extent of any such prohibition, without invalidating the
remaining provisions hereof.

                                       9
<PAGE>   10
     (b) Benefits payable to Plan participants and their beneficiaries under
this Trust Agreement may not be anticipated, assigned (either at law or in
equity), alienated, pledged, encumbered or subjected to attachment, garnishment,
levy, execution or other legal or equitable process.

     (c) This Trust Agreement shall be governed by and construed in accordance
with the laws of the Commonwealth of Pennsylvania.

SECTION 14. Effective Date.

     The effective date of this Trust Agreement shall be October 1, 1997.

     IN WITNESS WHEREOF, this instrument has been executed as of the day and
year first above written.

ATTEST:                                    UNION TEXAS PETROLEUM HOLDINGS, INC.

/s/ AMY J. WATKINS                         By:  /s/ M.N. MARKOWITZ 
- -------------------------------------          ---------------------------------
                                           Title: V. P. and Treasurer


ATTEST:                                    VANGUARD FIDUCIARY TRUST COMPANY

/s/ TAMMY HILLWORTH                        By:   /s/ [ILLEGIBLE] 
- -------------------------------------          ---------------------------------
                                                      Managing Director


                                       10

<PAGE>   1

                            SUPPLEMENTAL MEMORANDUM


         THIS SUPPLEMENTAL MEMORANDUM, dated as of August 24, 1983, by and
between Perusahaan Pertambangan Minyak Dan Gas Bumi Negara ("Pertamina"), on
the one hand, and Roy M. Huffington, Inc., Virginia International Company,
Ultramar Indonesia Limited (formerly Golden Eagle Indonesia Limited),
Indonesian Superior Oil Company (successor in interest to The Superior Oil
Company), Union Texas Far East Corporation and Universe Tankships, Inc. (herein
referred to collectively as "Contractors") on the other.  Pertamina and
Contractors do hereby agree as follows:

                                   ARTICLE 1
                                  Definitions

         1.1  As used herein, the following terms shall have the meanings
           indicated below:

                 A.  "Certified Reserves"  shall mean those certain estimated
reserves of natural gas, certified by DeGolyer and MacNaughton in written
statements, dated on or before November 15, 1979, from which reserves the
Huffco Contract Gas, the Mahakam Contract Gas and the Attaka Contract Gas are
to be taken.

                 B.  "Expansion Supply Agreement" shall mean that certain
Supply Agreement for Badak LNG Expansion Project, made and entered into as of
April 14, 1981, by and between Pertamina and Contractors (or, as to Indonesian
Superior Oil Company, its  predecessor in interest).

                 C.  "Memorandum of Understanding" shall mean that certain
Memorandum of Understanding, made and entered into as of April 14, 1981,
concurrently with the Expansion Supply Agreement by and between Pertamina,
Contractors (or, as to Indonesian Superior Oil Company, its predecessor in
interest), et al.





                                       1
<PAGE>   2

         1.2  All terms used herein which are defined in the Expansion Supply
Agreement.


                                   ARTICLE 2
                       Purpose of Supplemental Memorandum

         2.1  This Supplemental Memorandum is made pursuant to the provisions
of Sections 3.4 and 3.6 of the Expansion Supply Agreement and its purposes are
as follows:

                 A.  To reflect the adjustments to the Certified Reserves
contemplated and provided for in Section 3.4 of the Expansion Supply Agreement
and in the Memorandum of Understanding.  These adjustments have been completed.

                 B.  To confirm the respective amounts of the Attaka Contract
Gas, the Huffco Contract Gas and the Mahakam Contract Gas after (a) the
adjustments referred to in subparagraph A next above, and (b) execution of the
Nilam Unit Agreement by Contractors and Total Indonesie, et al., the final
redetermination of "Participating Interests" thereunder, and the approval of
such Unit Agreement and Participating Interests by Pertamina.  The Nilam Unit
Agreement has been executed, such Participating Interest have been finally
redetermined and each has been approved by Pertamina.





                                       2
<PAGE>   3
                                  ARTICLE 3
                    Amount of Attaka Contract Gas, Huffco
             Contract Gas and Mahakam Contract Gas, as Adjusted

         3.1  The Badak LNG Sales Contract Gas Requirement and the amounts of
Certified Reserves, after adjustments as contemplated and provided for in
Section 3.4 of the Expansion Supply Agreement and in the Memorandum of
Understanding are as set forth in the table attached hereto as Exhibit A and
hereby made a part hereof.  This Supplemental Memorandum shall confirm the
agreement of Pertamina and the Contractors to such adjustments.

         3.2  The respective amounts of the Attaka Contract Gas, the Huffco
Contract Gas and the Mahakam Contract Gas, after such adjustments and
application of the Nilam unit Agreement to that part of the Huffco Contract Gas
and the Mahakam Contract Gas located in the Nilam Field are as follows:

<TABLE>
         <S>                       <C>       <C>     <C>
         Attaka Contract Gas       0.1515     TSCF     4.3828%
         Huffco Contract Gas       2.2960     TSCF    66.4310%
         Mahakam Contract Gas      1.0088     TSCF    29.1862%
                                   ------            --------
         Badak LNG Sales Contract
                 Gas Requirement   3.4563     TSCF    100.000%
</TABLE>

         IN WITNESS WHEREOF, Pertamina and the Contractors have caused this
Supplemental Memorandum to be executed by their duly authorized representatives
effective as of this date first set forth above.

                          PERUSAHAAN PERTAMBANGAN MINYAK
                          DAN GAS BUMI NEGARA (PERTAMINA)

                          BY                       /s/
                             ---------------------------------------------

                          ROY M. HUFFINGTON, INC.

                          BY                       /s/
                             ---------------------------------------------

                          VIRGINIA INTERNATIONAL COMPANY





                                       3
<PAGE>   4
                          BY                       /s/
                             ---------------------------------------------

                          ULTRAMAR INDONESIA LIMITED

                          BY                       /s/
                             ---------------------------------------------

                          INDONESIAN SUPERIOR OIL COMPANY

                          BY                       /s/
                             ---------------------------------------------

                          UNION TEXAS FAR EAST CORPORATION

                          BY                       /s/
                             ---------------------------------------------

                          UNIVERSE TANKSHIPS, INC.

                          BY                       /s/
                             ---------------------------------------------




                                       4
<PAGE>   5
                                   EXHIBIT A

ATTACHMENT TO
ADDENDUM TO MEMORANDUM OF UNDERSTANDING APRIL 14, 1981
- ------------------------------
<TABLE>
<CAPTION>
                                           REVENUE ALLOCATION CALCULATION
                                                 DATE 23 AUGUST 1983
                                                      (IN TSCF)
<S>                                     <C>                                        <C>         <C>           <C>
(1)    FIELD                                    BADAK           NILAM           HDL+MKB         ATTAKA          TOTAL
      
(2)    TYPE OF GAS                              SOLUTION        SOLUTION        SOLUTION        SOLUTION
                                                GAS CAP         NON ASS         GAS CAP         GAS CAP
                                                NON ASS.                        NON ASS
      
(3)    D&M RESERVES NOVEMBER 1979               5,179000        2,201000        1,332000        0.438000        9,150000
      
(4)    WELLHEAD GAS FOR TRAIN A.B               3,726400        0.0             0.0             0.0             3,726400
      
(5)    GAS AVAILABLE                            1,452600        2,201000        1,332000        0.438000        5,423599
      
(6)    SHRINKAGE IN THE FIELD (%)               1,990000        1,430000        0.0             0.0
                                                0.028907        0.031474        0.0             0.0             0.060380
      
(7)    ACTUAL F/F BEFORE LEX (TO 1/12/1982)     0.0             0.006500        0.369900        0.096600        0.473000
      
(8)    FUTURE F/F TO LEX                        0.007400        0.009900        0.009800        0.004000        0.031100
      
(9)    NET GAS TO LEX                           1.416292        2.153125        0.952300        0.337400        4.859116
      
(10)   SHRINKAGE IN LEX (%)                     0.0             0.0             1.901000        10.842000
                                                0.0             0.0             0.018103        0.036581        0.054684
      
(11)   ACTUAL F/F AFTER LEX (TO 1/12/1982)      0.0             0.0             0.0             0.105700        0.105700
      
(12)   FUTURE F/F AFTER LEX                     0.0             0.0             0.031300        0.013100        0.044400
      
(13)   AVAILABLE FOR TRAIN C.D & KFP-1          1.416292        2.153125        0.902897        0.182019        4.654331
      
(14)   CO2 + INERT (%)                          3.005000        6.020006        8.637000        2.850000
                                                0.042560        0.129618        0.077983        0.005188        0.255348
      
(15)   C4 PLUS (%)                              2.590000        1.355000        1.305000        0.040000
                                                0.036682        0.029175        0.011783        0.000073        0.077712
      
(16)   NET GAS AVAILABLE                        1.337050        1.994331        0.813131        0.176759        4.321270
      
(17)   NET GAS ALLOCABLE TO TRAIN C+D & KFP-1   1.221352        1.821756        0.813131        0.176759        4.032996
                                               30.283966       45.171280       20.161942        4.382812
      
(18)   NET GAS ALLOCABLE TO TRAIN C+D           1.046703        1.561254        0.696857        0.151483        3.456296
      
(19)   NET GAS ALLOCABLE TO KFP-1               0.174648        0.260503        0.116274        0.025276        0.576700
      
(20)   GROSS GAS ALLOCABLE TO TRAIN C+D         1.108737        1.685563        0.773707        0.155891        3.7244077

(21)   GROSS GAS ALLOCABLE TO KFP-1             0.184998        0.281244        0.129118        0.026028        0.621380
      
(22)   EXCESS                                   0.122557        0.186317       -0.000000       -0.000000        0.300874
</TABLE>




                                                        JAKARTA AUGUST 24, 1983.





                                       5
<PAGE>   6


                           PERCENTAGE OF CONTRACT GAS



<TABLE>
<CAPTION>
1.  ATTAKA CONTRACT GAS
    -------------------
<S>                       <C>                            <C>                   <C>
    1.1  ATTAKA           100% X 4.3828%           =         4.3828%
                                                             -------
                                                                                  4.3828%


2.  HUFFCO CONTRACT GAS
    -------------------

    2.1  BADAK            97.90% X  30.2840%       =        29.6480%
    2.2  NILAM            81.43% X  45.1713%       =        36.7830%
                                                            --------
                                                                                 66.4310%


3.  MAHAKAM CONTRACT GAS
    --------------------

    3.1  HANDIL/BEKAPAI   100% X 20.1619%          =       20.1619%
    3.2  BADAK            2.10% X 30.2840%         =        0.6360%
    3.3  NILAM            18.57% X  45.1713%        =        8.3883%
                                                            -------
                                                                                 29.1862%
                                                                                 --------

                                                                    TOTAL        100.00%
</TABLE>





                                                        JAKARTA, AUGUST 24, 1983





                                       6
<PAGE>   7
                                  CONTRACT GAS

                                   (IN TSCF)





<TABLE>
    <S>          <C>                 <C>  <C>
    1.           ATTAKA CONTRACT GAS  :
                 -------------------   

                  4.3828%  X  3.4563  :       0.1515


    2.           HUFFCO CONTRACT GAS  :
                 -------------------   

                 66.4310%  X  3.4563  :       2.2960


    3.           MAHAKAM CONTRACT GAS :
                 --------------------   

                 29.1862%  X  3.4563  :       1.0088
                                              ------

                                              3.4563
</TABLE>





                                       7

<PAGE>   1





                                    SEVENTH


                                SUPPLY AGREEMENT


                                      For


                                  EXCESS SALES


                       (ADDITIONAL FIXED QUANTITIES UNDER
                    BADAK LNG SALES CONTRACT AS A RESULT OF
                      CONTRACT AMENDMENT AND RESTATEMENT)


                                    BETWEEN


                                   PERTAMINA
                                      And
                           VIRGINIA INDONESIA COMPANY
                             OPICOIL HOUSTON, INC.
                           ULTRAMAR INDONESIA LIMITED
                      UNION TEXAS EAST KALIMANTAN LIMITED
                        UNIVERSE GAS & OIL COMPANY, INC.


                                      And


                         VIRGINIA INTERNATIONAL COMPANY


                        Effective As Of January 1, 1990
<PAGE>   2
                            SEVENTH SUPPLY AGREEMENT
                                FOR EXCESS SALES
                          (ADDITIONAL FIXED QUANTITIES
                   UNDER BADAK LNG SALES CONTRACT AS A RESULT
                     OF CONTRACT AMENDMENT AND RESTATEMENT)


         THIS AGREEMENT, made and entered into in Jakarta on the 28th day of
September, 1992, but effective as of the 1st day of January, 1990, by and
between PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA ("PERTAMINA"), on
the one hand, and VIRGINIA INDONESIA COMPANY ("VICO"), OPICOIL HOUSTON, INC.,
ULTRAMAR INDONESIA LIMITED, UNION TEXAS EAST KALIMANTAN LIMITED, UNIVERSE GAS &
OIL COMPANY, INC., and VIRGINIA INTERNATIONAL COMPANY (herein referred to
collectively as "Contractors" and individually as "Contractor"), on the other
hand,

                                  WITNESSETH:

         WHEREAS, Contractors individually own or control all of the interest
of "Contractors" in that certain Amended and Restated Production Sharing
Contract, dated April 23, 1990, but effective as of August 8, 1968 (such
contract as hereafter amended is herein referred to as the "Amended and
Restated Production Sharing Contract") and that certain Production Sharing
Contract dated April 23, 1990, but effective as of August 8, 1998 (such
contract as hereafter amended is herein referred to as the "Renewed Production
Sharing Contract".  The Amended and Restated Production Sharing Contract and
the Renewed Production Sharing Contract are herein referred to collectively as
the "Production Sharing Contracts" and the area covered thereby is herein
referred to as the "VICO Contract Area"); and





                                      -1-
<PAGE>   3
         WHEREAS, pursuant to the Production Sharing Contracts, each of
PERTAMINA and Contractors is entitled to take and receive, sell and freely
export its respective share of the natural gas produced and saved from the VICO
Contract Area (the percentage share of such natural gas to which each of
PERTAMINA and Contractors is entitled, as determined under the Production
Sharing Contracts, is herein referred to as the "Production Sharing Percentage"
of such party); and


         WHEREAS, the reserves of natural gas in the VICO Contract Area exceed
the reserves committed to be produced, supplied and delivered by PERTAMINA and
Contractors to meet a portion of PERTAMINA's existing obligations under LNG
sales contracts, LPG sales contracts and domestic gas sales contracts; and

         WHEREAS, PERTAMINA and Contractors are parties to the Amended and
Restated Bontang Processing Agreement dated as of February 9, 1988 (as from
time to time amended, the "Processing Agreement") which provides for the
operation of the natural gas liquefaction and related facilities located at
Bontang Bay, on the east coast of Kalimantan, Indonesia (herein referred to as
the "Bontang Plant") and the payment of the costs of such operation (such costs
as determined in accordance with the Processing Agreement are herein referred
to as "Plant Operating Costs"); and





                                      -2-
<PAGE>   4
         WHEREAS, PERTAMINA and Contractors have agreed to use the Bontang
Plant in part for the liquefaction of the VICO Contract Gas (as hereinafter
defined) and the Other Contract Gas (as hereinafter defined); and

         WHEREAS, PERTAMINA, in collaboration with Contractors and its
production sharing contractors in other contract areas in East Kalimantan
(herein referred to as the "Other Contract Areas"), has entered into that
certain Badak LNG Sales Contract originally dated as of April 14, 1981, with
Chubu Electric Power Co., Inc., The Kansai Electric Power Co., Inc., Osaka Gas
Co., Ltd. and Toho Gas Co., Ltd. (herein referred to collectively as "Buyers"
and individually as a "Buyer"), and in support of the performance by PERTAMINA
of its obligations thereunder PERTAMINA and Contractors entered into a supply
agreement dated as of April 14, 1981 (herein referred to as the "Original
Supply Agreement"); and

         WHEREAS, pursuant to a Memorandum of Agreement dated as of September
7, 1989, PERTAMINA and Buyers agreed to make certain changes to the price,
take-or-pay provisions and annual Fixed Quantities under the said Badak LNG
Sales Contract, and to give effect thereto PERTAMINA and Buyers have executed
an amendment and restatement of the said Badak LNG Sales Contract as of January
1, 1990 (such contract as so amended and restated being herein referred to as
the "1981 Sales Contract"), as a result of which the original annual Fixed
Quantities thereunder (the  "Original Quantities") have been increased by the
following additional amounts of LNG (expressed in billions of BTU's) for each
year as stated in the second column in the table below (such quantities being
herein referred to as the "Additional Quantities") and accordingly





                                      -3-
<PAGE>   5
the total increased Fixed Quantities under the 1981 Sales Contract for each
year comprises Additional Quantities and Original Quantities in the following
percentages stated in the third and fourth columns respectively in the table
below:

<TABLE>
<CAPTION>
Year                         Additional               Additional                  Original
                             Quantities               Quantities                  Quantities
                               (BBTU)                    (%)                         (%)
<S>                              <C>                     <C>                       <C>
1990                              5,820                  3.2915                    96.7085
1991                              8,730                  4.8573                    95.1427
1992                             11,640                  6.3732                    93.6268
1993                             14,550                  7.8416                    92.1584
1994-2002                        17,460                  9.2646                    90.7354
2003                              3,934                  9.2648                    90.7352
</TABLE>


(For the purposes of applying the further provisions hereof in any year the
percentage shown in the third column above in respect of such year is herein
referred to as the "Additional Quantities Percentage" and the percentage shown
in the fourth column above in respect of such year is herein referred to as the
"Original Quantities Percentage"); and

         WHEREAS, PERTAMINA and each Contractor desire to supply and deliver
natural gas from the VICO Contract Area in support of the performance by
PERTAMINA of an agreed portion of its obligations to supply the Additional
Quantities; and


         WHEREAS, each Contractor desires to dispose of its Production Sharing
Percentage of the VICO Contract Gas (as hereinafter defined) in accordance with
the terms of this Agreement,





                                      -4-
<PAGE>   6
         NOW, THEREFORE, the parties agree as follows:





                                      -5-
<PAGE>   7
                                   ARTICLE 1

         This Agreement shall be effective as of January 1, 1990, and shall
terminate on the date that the 1981 Sales Contract terminates.

                                   ARTICLE 2

         2.1     The total quantity of net natural gas required to be supplied
and delivered out of recoverable reserves of natural gas in East Kalimantan for
liquefaction and sale as Additional Quantities is estimated to be 0.210
trillion standard cubic feet ("t.s.c.f.") (such quantity being herein referred
to as the "Additional Quantities Net Gas Requirement").

         2.2     PERTAMINA and Contractors hereby commit and agree to supply
and deliver from recoverable reserves of natural gas in the VICO Contract Area
sufficient natural gas (and LNG resulting from the liquefaction thereof) to
meet a portion of the Additional Quantities Net Gas Requirement over the term
of this Agreement consisting of 0.062 t.s.c.f., or 29.6004% thereof.  Such
quantity of net natural gas committed to be supplied pursuant to this Agreement
is herein referred to as the "VICO Contract Gas", and the above-stated
percentage is herein referred to as the "Producers' Percentage".

         2.3     To meet the balance of the Additional Quantities Net Gas
Requirement, constituting 0.148 t.s.c.f., sufficient natural gas (and LNG
resulting from the liquefaction thereof) will be





                                      -6-
<PAGE>   8
committed for supply and delivery by PERTAMINA and its production sharing
contractors from recoverable reserves of natural gas in the Other Contract
Areas by separate supply agreements, similar hereto and compatible herewith,
executed and delivered concurrently herewith (such amount being herein
collectively referred to as the "Other Contract Gas").

         2.4     The amounts of net natural gas constituting the VICO Contract
Gas and the Other Contract Gas are part of the estimates of proved recoverable
reserves of natural gas as certified by the independent petroleum consultant
firm of DeGolyer and MacNaughton in written statements dated on or before April
10, 1986, based on data available on January 31, 1986.

                                   ARTICLE 3

         The VICO Contract Gas and the Other Contract Gas may be produced from
different fields at times and production rates  which may change from time to
time during the term hereof so as to secure the optimal ultimate recovery of
natural gas. The supply of natural gas from the VICO Contract Area and the
Other Contract Areas will be coordinated among PERTAMINA, VICO and the
operators of the Other Contract Areas so as to conserve and permit full
utilization of such natural gas.

         The sources of supply, producing rates, quality of gas, metering and
related matters shall be matters for study by the East Kalimantan Gas Reserves
Management Committee, consisting of representatives from PERTAMINA, VICO, Total
Indonesie and Unocal Indonesia, Ltd.





                                      -7-
<PAGE>   9
                                   ARTICLE 4

         4.1     PERTAMINA shall be responsible for the due and prompt
administration of the 1981 Sales Contract for the benefit of PERTAMINA and
Contractors.  All matters which affect the 1981  Sales Contract or the sale and
delivery of LNG thereunder will be administered by a representative to be
appointed by PERTAMINA and the representative appointed by Contractors under
Article 8.  It is understood, however, where immediate action is required, it
may be necessary from time to time for PERTAMINA, as seller under the 1981
Sales Contract, to take certain administrative and operational actions without
prior consultation.  Contractors will be promptly advised of any such action.

         4.2     PERTAMINA and Contractors agree to consult with each other
freely on all matters relating to the 1981 Sales Contract. PERTAMINA and
Contractors shall confer and agree as to any amendment to the 1981 Sales
Contract and as to any permitted action or election thereunder which
constitutes a material adjustment in the quantities of LNG to be sold and
delivered thereunder or a change in the terms thereof.  At the request of any
party hereto, a memorandum evidencing any such agreement shall be prepared as
soon as feasible and signed by each party hereto.

                                   ARTICLE 5

         5.1     PERTAMINA will cause the LNG resulting from the liquefaction
of the VICO





                                      -8-
<PAGE>   10
Contract Gas and the Other Contract Gas to be delivered to Buyers at the
"Delivery Point" as defined in the 1981 Sales Contract. Title to each
Contractor's share of LNG extracted from the VICO Contract Gas shall pass to
PERTAMINA eo instante with the passage of title from PERTAMINA to each Buyer.

         5.2     At the time of delivery of Additional Quantities to a Buyer at
the Delivery Point, PERTAMINA will furnish Contractors with appropriate
documentation to evidence the quantity and quality thereof, together with
copies of the invoices to such Buyer covering such shipment.  PERTAMINA will
also furnish to Contractors a copy of each invoice or billing delivered to a
Buyer on account of other payment obligations of such Buyer under  the 1981
Sales Contract concurrently with its being furnished to such Buyer.
Calculation of the "Contract Sales Price" under the 1981 Sales Contract, the
amount of sales invoices and other billings and any adjustments, shall be
reviewed and approved by PERTAMINA and Contractors prior to presentation to
Buyer.

                                   ARTICLE 6

         6.1     Subject to Section 6.6, a portion of each obligation
("Contract Obligation") due from a Buyer pursuant to the 1981 Sales Contract in
respect of quantities of LNG sold and delivered or in respect of quantities of
LNG required to be taken but which are not taken shall be deemed to constitute
an amount payable in respect of Additional Quantities (each such portion is
herein referred to as an "Additional Quantities Payment").  The Additional
Quantities Payment





                                      -9-
<PAGE>   11
shall be calculated as the quantity of LNG (expressed in millions of BTU's)
upon which the relevant invoice is based (herein called the "Invoiced
Quantity") multiplied by the Additional Quantities Percentage multiplied by the
Contract Sales Price under the 1981 Sales Contract (as that term is defined
therein) in effect as of the date the relevant Contract Obligation accrued.
The Additional Quantities Payment shall be determined disregarding any
assignment by a Buyer of any of its rights or obligations under the 1981 Sales
Contract and shall not be reduced by any agreed invoice credit or set-off
(other than one in respect of a debt or obligation first arising on or after
January 1, 1990 applicable to the Additional  Quantities) which reduces any
payment from a Buyer in respect of the relevant Contract Obligation.  Subject
to the words in parentheses in the preceding sentence, if the net amount
actually received from such Buyer is less than the amount of such Contract
Obligation, such net amount received shall be first applied and deemed paid as
to the Additional Quantities Payment up to the whole amount thereof; and if
such net amount received is less than the Additional Quantities Payment, the
next following payment or payments received from any source in respect of the
1981 Sales Contract shall be first applied and deemed paid as to the shortfall
in the Additional Quantities Payment.

         6.2     The amounts to be paid to each Contractor in respect of the
LNG resulting from the liquefaction of natural gas to be supplied under this
Agreement shall be:

         (a)     its Production Sharing Percentage of the Producers' Percentage
                 of each Transfer Amount (as hereinafter defined), together
                 with any interest accruing thereon, and





                                      -10-
<PAGE>   12
         (b)     its Production Sharing Percentage of the Producers' Percentage
                 under the Original Supply Agreement of each Retained Amount
                 (as hereinafter defined), together with any interest accruing
                 thereon.

         6.3     In order to arrange for the receipt by each Contractor of the
payments to which such Contractor is entitled under Section 6.2, PERTAMINA
hereby assigns to each Contractor its share as stated in Section 6.2 of each
Additional Quantities Payment, together with any interest accruing thereon.

         6.4     Throughout the term of this Agreement, all monies paid in
respect of Additional Quantities Payments shall be paid in U.S. Dollars
directly to Continental Bank International in New York City (or such other
leading bank in the United States as shall be selected by PERTAMINA and
approved by Contractors) pursuant to that certain Bontang II Trustee and Paying
Agent Agreement, amended and restated as of July 15, 1991, as the same may be
further amended from time to time, among PERTAMINA, Contractors, the production
sharing contractors in the Other Contract Areas and the Trustee thereunder (the
trust thereby constituted being herein called the "Bontang II Trust").  The
said Trustee shall be required to segregate amounts received in respect of
Additional Quantities Payments from other amounts received from Buyers pursuant
to the 1981 Sales Contract.

         Amounts so received in the Bontang II Trust shall be used for payment
of (i) an agreed portion of Plant Operating Costs, and (ii) other costs
approved by PERTAMINA and Contractors.





                                      -11-
<PAGE>   13
         Amounts so received in the Bontang II Trust, to the extent that they
are not used for the payments referred to in the  preceding sentence, shall be
applied in accordance with Section 6.5.

         6.5     Subject to Section 6.6, of each Additional Quantities Payment:

         (a)     there shall be retained in the Bontang II Trust an amount
                 (herein referred to as the "Retained Amount") calculated as
                 the Invoiced Quantity multiplied by the Original Quantities
                 Percentage multiplied by: 

                 U.S.$0.04 during the calendar year 1990 

                 U.S.$0.06 during the calendar year 1991 

                 U.S.$0.08 during the calendar year 1992 

                 U.S.$0.10 during the calendar year 1993

                 U.S.$0.12 from and after January 1, 1994.

                 In calculating the Retained Amount no deduction shall be made
                 in respect of Plant Operating Costs or other costs authorized
                 for payment out of the Bontang II Trust pursuant to Section
                 6.4.

         (b)     the balance after such retention (herein referred to as the
                 "Transfer Amount") shall be paid, after deducting the
                 Additional Quantities Percentage of any Plant Operating Costs
                 or other costs authorized for payment out of the Bontang II
                 Trust pursuant to Section 6.4, to Continental Bank
                 International in New York City





                                      -12-
<PAGE>   14
                 pursuant to that certain Bontang Excess Sales Trustee and
                 Paying Agent Agreement, amended and restated as of February 9,
                 1988, as the same may be further amended from time to time,
                 among PERTAMINA, Contractors, the production sharing
                 contractors in the Other Contract Areas and the Trustee
                 thereunder (the trust thereby constituted being herein called
                 the "Excess Sales Trust").

         If in accordance with the last sentence of Section 6.1 more than one
payment is received in respect of an Additional Quantities Payment (because of
a shortfall in the amount received in respect of the relevant Contract
Obligation), the amount of each such payment received, insofar as it is to be
applied to the Additional Quantities Payment, shall be divided in the
proportions that the Transfer Amount and the Retained Amount respectively bear
to the relevant Additional Quantities Payment, with the Transfer Amount portion
being paid to the Excess Sales Trust (after deduction of costs as prescribed in
paragraph (b) above), and the Retained Amount portion being retained in the
Bontang II Trust.

         Payments in respect of interest on an Additional Quantities Payment
shall be allocated on a pro-rata basis between funds retained in the Bontang II
Trust and funds paid to the Excess Sales Trust pursuant to this Section 6.5
(the proportionate relationship to be that between the Retained Amount and
Transfer Amount, determined as of the date that the original Contract
Obligation on which interest is accruing was incurred).





                                      -13-
<PAGE>   15
         Amounts so retained in the Bontang II Trust or paid to the Excess
Sales Trust, shall, insofar as they are applicable to the VICO Contract Gas
(i.e., the net realized price for the VICO Contract Gas), be disbursed to
PERTAMINA and each Contractor in accordance with its Production Sharing
Percentage at a bank or banks of its choice.

         PERTAMINA and Contractors will each give such instructions,
authorizations and approvals, and take such other action (including amendment
of the above-mentioned Badak Expansion Trustee and Paying Agent Agreement) as
may be required to cause the payments contemplated by this Section 6.5 to be
made.

         6.6     If in or in respect of any year (the "Original Year") pursuant
to the 1981 Sales Contract a Buyer incurred an obligation to pay for quantities
of LNG not taken, exercised an Allowance, or was unable to take quantities of
LNG due to the occurrence or continuation of an event of Force Majeure, then
for the purposes of determining:

         (a)     the Additional Quantities Payment, and the amounts to be paid
                 to the Excess Sales Trust and retained in the Bontang II Trust
                 pursuant to Section 6.5, in respect of any consequent Contract
                 Obligation of such Buyer in respect of:

                  (i)     a Quantity Deficiency, and/or

                 (ii)     any consequent purchase by such Buyer of Make-Up LNG,
                          Make-Good LNG or Restoration Quantities, and





                                      -14-
<PAGE>   16
         (b)     the quantities of natural gas supplied by PERTAMINA and
                 Contractors under this Supply Agreement in respect of any
                 purchase referred to in paragraph (a)(ii) above,

the Additional Quantities Percentage and the Original Quantities Percentage
shall be those applicable to the Original Year but the Contract Sales Price
shall be that in effect when the relevant Additional Quantities Payment is
invoiced (expressions defined in the 1981 Sales Contract shall have the same
meanings when used in this Section 6.6).

         6.7     (a)      The right of Contractors to the payments provided for
in this Article 6 shall extend throughout the term of this Agreement and shall
not be affected by the production rates or sources of natural gas supplied from
the VICO Contract Area or the Other Contract Areas from time to time during the
term hereof.

                 (b)      If the quantities of net natural gas produced from
the VICO Contract Area and delivered pursuant to this Agreement exceed in the
aggregate the quantity of the VICO Contract Gas, the Producers' Percentage (and
the revenues to be  paid to PERTAMINA and Contractors hereunder) will not be
increased, except in the event of an occurrence contemplated in Section 6.7(d),
and Contractors, together with PERTAMINA, will be credited with and have the
right to receive revenue from future marketing opportunities in respect of a
quantity of net natural gas from reserves in the Other Contract Areas equal to
such excess quantities.

                 (c)      If the quantities of net natural gas produced from
the VICO Contract Area





                                      -15-
<PAGE>   17
and delivered pursuant to this Agreement are in the aggregate less than the
quantity of the VICO Contract Gas, the Producers' Percentage (and the revenues
to be paid to PERTAMINA and Contractors hereunder) will not be reduced, except
in the event of an occurrence contemplated in Section 6.7(d), and the
production sharing contractors in the Other Contract Areas, together with
PERTAMINA, will be credited with and have the right to receive revenue from
future marketing opportunities in respect of a quantity of net natural gas from
reserves in the VICO Contract Area equal to excess quantities delivered from
sources within the Other Contract Areas.

                 (d)      If an insufficiency of deliverable reserves of
natural gas shall occur which precludes the delivery from participating fields
within the VICO Contract Area or from participating fields within either or
both of the Other Contract Areas of the aggregate amount of natural gas
committed therefrom pursuant to this Agreement or to one or both of the supply
agreements referred to in Section 2.3 over the term thereof, then  such
insufficiency shall be delivered from participating fields within the area(s)
not experiencing an insufficiency of deliverable reserves and the Producers'
Percentage shall thereupon be adjusted (together with a corresponding
adjustment to the VICO Contract Gas) to reflect the revised share of the net
natural gas in support of PERTAMINA's obligations in respect of the Additional
Quantities which will be supplied and delivered from the VICO Contract Area
over the term hereof, such adjustment in the Producers' Percentage to apply
only to payments provided for in this Article 6 received after the date
thereof.  The procedure for determining (a) an insufficiency in deliverable
reserves, (b) the allocation between the VICO Contract Area and one of the
Other Contract Areas of the right to supply any deficiency in deliveries of the
Other Contract Gas or the allocation between





                                      -16-
<PAGE>   18
the Other Contract Areas of the right to supply any deficiency in deliveries of
the VICO Contract Gas, and (c) the calculation of the future Producers'
Percentage shall be made in accordance with principles to be decided upon by
PERTAMINA.

                                   ARTICLE 7

         All disputes arising in connection with this Agreement shall be
finally settled by arbitration conducted in the English language in Paris,
France, by three arbitrators under the Rules of Arbitration of the
International Chamber of Commerce. Judgment upon the award rendered may be
entered in any court having jurisdiction, or application may be made to such
court for a juridical acceptance of the award and an order of enforcement, as
the case may be.

         This Agreement shall be governed by and interpreted in accordance with
the laws of the State of New York, United States of America.

                                   ARTICLE 8

         VICO is designated representative by Contractors for performance on
behalf of Contractors of their obligation under Section 4.1 and for the giving
of notices, responses or other communications to and from Contractors under
this Agreement.  Such representative may be changed by written notice to such
effect from Contractors to PERTAMINA.





                                      -17-
<PAGE>   19
                                   ARTICLE 9

         Any notices to the parties shall be in writing and sent by mail or
telex to the following addresses:

TO PERTAMINA:

PERUSAHAAN PERTAMBANGAN MINYAK DAN GAS BUMI NEGARA
(PERTAMINA)
Jalan Medan Merdeka Timur 1 A
Jakarta, Indonesia
Attention:  Head of BPPKA

Cable:  PERTAMINA, Jakarta, Indonesia
Telex:  PERTAMINA, 44134 Jakarta
Telecopy:  343882

TO CONTRACTORS:

VIRGINIA INDONESIA COMPANY (VICO)
6th Floor, Kuningan Plaza South Tower
JL. H.R. Rasuna Said Kav. C11-14
P.O. Box 2828
Jakarta Selatan, Indonesia
Attention:  President - VICO Indonesia Division

Cable:  VICO
Telex:  79644421
Telecopy:  5200174 or 3800037
                 cc:      VIRGINIA INDONESIA COMPANY
                          One Houston Center
                          1221 McKinney
                          Suite 624
                          P.O. Box 1551
                          Houston, Texas 77251-1551
                          U.S.A.
                          Attention:  Chairman
                          Telex:  166-100
                          Telecopy:  (713) 754-6698





                                      -18-
<PAGE>   20
A party may change its address by written notice to the other parties.

                                   ARTICLE 10

         10.1    This Agreement shall not be amended or modified except by
written agreement signed by the parties hereto.

         10.2    This Agreement shall inure to the benefit of, and be binding
upon, PERTAMINA and each Contractor, their respective successors and assigns,
provided that this Agreement shall be assignable by a Contractor only if such
Contractor concurrently  assigns to the same assignee an equal interest in the
Production Sharing Contract.

         10.3    The parties to this Agreement shall be the only persons or
entities entitled to enforce the obligations hereunder of the other parties
hereto, and no persons or entities not parties to this Agreement shall have the
right to enforce any of the obligations hereunder of any of the parties hereto.





                                      -19-
<PAGE>   21
         IN WITNESS WHEREOF, PERTAMINA and Contractors have caused their duly
authorized representatives to execute this Agreement as of the day and year
first above written but effective as of January 1, 1990.

PERUSAHAAN PERTAMBANGAN                 VIRGINIA INDONESIA COMPANY
MINYAK DAN GAS BUMI NEGARA 
(PERTAMINA)


By            /s/                       By    /s/
   -------------------------               -------------------------

                                        OPICOIL HOUSTON, INC.


                                        By    /s/
                                           -------------------------


                                        ULTRAMAR INDONESIA 
                                        LIMITED


                                        By     /s/
                                           -------------------------


                                        UNION TEXAS EAST 
                                        KALIMANTAN LIMITED


                                        By     /s/
                                           -------------------------

                                        
                                        UNIVERSE GAS & OIL
                                        COMPANY, INC.


                                        By     /s/
                                           -------------------------


                                        VIRGINIA INTERNATIONAL 
                                        COMPANY


                                        By     /s/
                                           -------------------------




                                      -20-

<PAGE>   1
                                                                    EXHIBIT 21.1


                         SUBSIDIARIES OF THE REGISTRANT

Except as otherwise noted, Union Texas Petroleum Holdings, Inc. (the "Company")
holds, either directly or indirectly, all or substantially all of the voting
stock of the following corporations. Except as otherwise noted, all of the
corporations are incorporated in the state of Delaware.

ENSTAR Corporation (1)
ENSTAR Indonesia, Inc. (1)
ENSTAR Petroleum, Ltd. (1)(2)
Four Oaks Insurance, Ltd. (3)
Purchasing Services Inc. (1)
Unicon Producing Company (4)
Unimar Company (5)
Union Texas A&E-1, Inc.
Union Texas A&E-2, Inc.
Union Texas A&E-3, Inc.
Union Texas A&E-4, Inc.
Union Texas A&E-5, Inc.
Union Texas Acadia Corporation
Union Texas Adriatic, Inc.
Union Texas Alaska, L.L.C. (6)
Union Texas Albion, Inc.
Union Texas Algeria Limited (7)
Union Texas (Argentina) Ltd.
Union Texas Asia Corporation
Union Texas Azerbaijan Limited (7)
Union Texas Azerbaijan Services Limited (7)
Union Texas Bangladesh, Inc.
Union Texas Barakan, Inc.
Union Texas Bohai Limited (7)
Union Texas Brasil, Inc.
Union Texas Britannia Limited (8)
Union Texas Carthage, Inc.
Union Texas Central Asia Limited (7)
Union Texas Congolais Limited (7)
Union Texas de Bolivia Limited (7)
Union Texas de Ecuador Limited (7)
Union Texas Development Corporation
Union Texas do Brasil Limited (7)
Union Texas East Kalimantan Limited (7)
Union Texas Energy Development Limited (8)
Union Texas Espana, Inc.
Union Texas Finance, Inc.
Union Texas Gas Limited (8)
Union Texas Hellas, Inc.
Union Texas I Corporation
Union Texas International Corporation


                                      -1-

<PAGE>   2

A&E-2, Ltd. (9)
A&E-3, Ltd. (9)
A&E-4, Ltd. (9)
A&E-5, Ltd. (9)
Union Texas Jordan Limited (7)
Union Texas (Kai) Limited (7)
Union Texas Lok Batan Limited (7)
Union Texas Petroleum Energy Corporation
Union Texas MA-1, Inc.
Union Texas MA-2, Inc.
Union Texas MA-3, Inc.
Union Texas MA-4, Inc.
Union Texas MA-5, Inc.
Union Texas MA-2, Ltd. (9)
Union Texas MA-3, Ltd. (9)
Union Texas MA-4, Ltd. (9)
Union Texas MA-5, Ltd. (9)
Union Texas Maghreb, Inc.
Union Texas Methane, Inc.
Union Texas Metropole, S.A. (10)
Union Texas Offshore Alpha-1, Inc.
Union Texas Offshore Alpha-2, Inc.
Union Texas Offshore Alpha-3, Inc.
Union Texas Offshore Alpha-4, Inc.
Union Texas Offshore Alpha-5, Inc.
Union Texas Offshore Alpha-2, Ltd. (9)
Union Texas Offshore Alpha-3, Ltd. (9)
Union Texas Offshore Alpha-4, Ltd. (9)
Union Texas Offshore Alpha-5, Ltd. (9)
Union Texas Offshore Beta-1, Inc.
Union Texas Offshore Beta-2, Inc.
Union Texas Offshore Beta-3, Inc.
Union Texas Offshore Beta-4, Inc.
Union Texas Offshore Beta-5, Inc.
Union Texas Offshore Beta-2, Ltd. (9)
Union Texas Offshore Beta-3, Ltd. (9)
Union Texas Offshore Beta-4, Ltd. (9)
Union Texas Offshore Beta-5, Ltd. (9)
Union Texas Offshore Corporation
Union Texas PNG, Inc.
Union Texas Pakistan, Inc.
Union Texas Pakistan Power Limited (7) 
Union Texas Petrochemicals Corporation
Union Texas Petrochemicals Pipeline, Inc. 
Union Texas Petroleum Limited (8)
Union Texas Petroleum Services Corporation 
Union Texas Power Development Limited (7)


                                      -2-
<PAGE>   3

Union Texas Qobustan Limited (7) 
Union Texas Qobustan Operations Limited (7)
Union Texas (Rebi) Limited (7) 
Union Texas South Atlantic, Inc.
Union Texas (South East Asia) Inc.
Union Texas South Pacific, Inc.
Union Texas (Tanimbar) Limited (7)
Union Texas Tomori, Inc.
Union Texas Trading Corporation
Union Texas Trans-Caucasus, Inc.
Union Texas (Transnational) Limited (7)
Union Texas Transportation Limited (8)
Union Texas Trinidad Limited (7)
Union Texas Tunisia, Inc.
Union Texas Venezuela Limited (7)
Union Texas Yemen Limited (7)
Union Texas Zulia, Inc. (11)
Unistar, Inc.
VICO 7.5, Inc. (1)
Virginia Indonesia Company (1)
Virginia Services, Ltd. (1)
VICO Services, Inc. (1)
VICO Enterprises, Inc.
VICO Enterprises International B.V. (12)
Virginia International Company (1)



- ---------------
(1)      Direct or indirect subsidiary of Unimar Company.
(2)      Incorporated under the laws of Alberta, Canada.
(3)      Incorporated under the laws of Bermuda.
(4)      A Texas general partnership between a subsidiary of the Company and 
         Continental Can Europe, Inc.
(5)      A Texas general partnership between a subsidiary of the Company and a 
         subsidiary of LASMO plc, a U.K. company.
(6)      Delaware Limited Liability Company.
(7)      Incorporated under the laws of The Bahamas.
(8)      Incorporated under the laws of the United Kingdom.
(9)      Incorporated under the Laws of the Cayman Islands.
(10)     Incorporated under the laws of France.
(11)     Incorporated under the laws of the State of California.
(12)     Incorporated under the laws of The Netherlands.

                                      -3-


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S SEC FORM 10-K FOR THE PERIOD ENDING DECEMBER 31, 1997 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                          24,324
<SECURITIES>                                         0
<RECEIVABLES>                                   82,172
<ALLOWANCES>                                         0
<INVENTORY>                                     38,318
<CURRENT-ASSETS>                               175,353
<PP&E>                                       3,496,940
<DEPRECIATION>                               1,750,279
<TOTAL-ASSETS>                               2,021,556
<CURRENT-LIABILITIES>                          279,656
<BONDS>                                        626,404
                                0
                                          0
<COMMON>                                         4,391
<OTHER-SE>                                     664,204
<TOTAL-LIABILITY-AND-EQUITY>                 2,021,556
<SALES>                                        909,391
<TOTAL-REVENUES>                               933,228
<CGS>                                          314,330
<TOTAL-COSTS>                                  557,134
<OTHER-EXPENSES>                                99,380
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               7,412
<INCOME-PRETAX>                                269,302
<INCOME-TAX>                                   133,436
<INCOME-CONTINUING>                            135,866
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   135,866
<EPS-PRIMARY>                                     1.60
<EPS-DILUTED>                                     1.59
        

</TABLE>


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