UNION TEXAS PETROLEUM HOLDINGS INC
S-3, 1995-04-21
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 21, 1995
 
                                                       REGISTRATION NO. 33-.....
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
 
                                    FORM S-3
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------
 
                      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 NUMBER)
</TABLE>
 
                            1330 POST OAK BOULEVARD
                              HOUSTON, TEXAS 77056
                                 (713) 623-6544
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                             NEWTON W. WILSON, III
          GENERAL COUNSEL, VICE PRESIDENT-ADMINISTRATION AND SECRETARY
                            1330 POST OAK BOULEVARD
                              HOUSTON, TEXAS 77056
                                 (713) 623-6544
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                             ---------------------
 
                                   Copies to:
 
<TABLE>
<S>                            <C>                            <C>
        MARK ZVONKOVIC            EDWARD SONNENSCHEIN, JR.             JOHN B. TEHAN
    CHRISTINE B. LAFOLLETTE           LATHAM & WATKINS          SIMPSON THACHER & BARTLETT
    ANDREWS & KURTH L.L.P.     633 WEST 5TH STREET, SUITE 4000      425 LEXINGTON AVENUE
     425 LEXINGTON AVENUE       LOS ANGELES, CALIFORNIA 90071    NEW YORK, NEW YORK 10017
   NEW YORK, NEW YORK 10017            (213) 485-1234                 (212) 455-2000
        (212) 850-2800
</TABLE>
 
                             ---------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of the Registration Statement.
 
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / /
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  / /
 
                        CALCULATION OF REGISTRATION FEE


<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------
                                                                       PROPOSED
                                                       PROPOSED        MAXIMUM
                                                       MAXIMUM        AGGREGATE
      TITLE OF EACH CLASS OF         AMOUNT TO BE   OFFERING PRICE     OFFERING       AMOUNT OF
    SECURITIES TO BE REGISTERED     REGISTERED(1)    PER SHARE(2)      PRICE(2)    REGISTRATION FEE
- ---------------------------------------------------------------------------------------------------
<S>                                <C>             <C>             <C>             <C>
Common Stock, par value
  $.05 per share...................    11,500,000       $23.00       $264,500,000      $91,208
- ---------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------
</TABLE>
 
 
(1) Includes 1,500,000 shares covered by the over-allotment options.
(2) Estimated solely for the purpose of calculating the registration fee.
    Pursuant to Rule 457(c) of the Securities Act of 1933, based on the average
    high and low prices per share of the registrant's Common Stock on April 19,
    1995, as reported by the consolidated reporting system of the New York Stock
    Exchange.
                             ---------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                                EXPLANATORY NOTE
 
     This Registration Statement contains two forms of prospectus: one to be
used in connection with a United States offering (the "U.S. Prospectus") and one
to be used in connection with a concurrent international offering (the
"International Prospectus"). The U.S. Prospectus and the International
Prospectus will be identical in all respects except that they will contain
different front and back cover pages and different descriptions of the plan of
distribution under the caption "Underwriting" and the International Prospectus
will contain an additional section under the caption "Certain United States Tax
Consequences to Non-U.S. Holders." The U.S. Prospectus is included herein and is
followed by those pages to be used in the International Prospectus which differ
from, or are in addition to, those in the U.S. Prospectus. Each of the pages for
the International Prospectus included herein has been labeled "Alternate Page
for International Prospectus."
 
     If required pursuant to Rule 424(b) of the General Rules and Regulations
under the Securities Act of 1933, as amended, ten copies of each of the
prospectuses in the forms in which they are used after the Registration
Statement becomes effective will be filed with the Securities and Exchange
Commission.
<PAGE>   3
 
Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
 

PROSPECTUS                 SUBJECT TO COMPLETION                         [LOGO]
                                 APRIL 21, 1995
 
10,000,000 SHARES
UNION TEXAS PETROLEUM HOLDINGS, INC.
 
COMMON STOCK
($.05 PAR VALUE)
 
The shares of Common Stock, $.05 par value per share (the "Common Stock"), of
Union Texas Petroleum Holdings, Inc. (the "Company") offered hereby (the
"Shares") are being sold by the Selling Shareholder. See "Selling Shareholder
and Principal Shareholder." The Company will not receive any of the proceeds
from the sale of the Shares offered hereby. Upon completion of the Offerings (as
defined below), the Selling Shareholder will hold approximately 27% (or 25%, if
the Underwriters exercise their over-allotment options in full) of the Company's
outstanding Common Stock.
 
Of the Shares being offered, 8,000,000 shares are being offered hereby in the
United States and Canada (the "U.S. Offering") and 2,000,000 shares are being
offered in a concurrent international offering outside the United States and
Canada (the "International Offering" and collectively with the U.S. Offering,
the "Offerings"), subject to transfers between the U.S. Underwriters and the
International Underwriters. The Price to Public and Underwriting Discount per
Share will be identical for the U.S. Offering and the International Offering.
See "Underwriting." The closing of the U.S. Offering and the International
Offering are conditioned upon each other.
 
The Common Stock is listed on the New York Stock Exchange under the symbol
"UTH." On April 20, 1995, the last reported sale price of the Common Stock on
the New York Stock Exchange Composite Transactions Tape was $23 3/8 per share.
See "Market and Dividend Information."
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------
                                                                               PROCEEDS TO
                                       PRICE TO            UNDERWRITING        SELLING
                                       PUBLIC              DISCOUNT            SHAREHOLDER(1)
<S>                                    <C>                 <C>                 <C>
Per Share............................  $                   $                   $
Total(2).............................  $                   $                   $
- ---------------------------------------------------------------------------------------------
</TABLE>
 
 
(1) Estimated expenses of $700,000 will be payable by the Company pursuant to
    its obligations under a registration agreement with the Selling Shareholder.
    See "Selling Shareholder and Principal Shareholder."
 
(2) The Selling Shareholder has granted to the U.S. Underwriters and the
    International Underwriters 30-day options to purchase up to an aggregate of
    1,500,000 additional shares of Common Stock at the Price to Public, less
    Underwriting Discount, solely to cover over-allotments, if any. If the
    Underwriters exercise such options in full, the total Price to Public,
    Underwriting Discount and Proceeds to Selling Shareholder will be
    $          , $          and $          , respectively. See "Underwriting."
 
The Shares are offered subject to receipt and acceptance by the Underwriters, to
prior sale and to the Underwriters' right to reject any order in whole or in
part and to withdraw, cancel or modify the offer without notice. It is expected
that delivery of the Shares will be made at the office of Salomon Brothers Inc,
Seven World Trade Center, New York, New York, or through the facilities of The
Depository Trust Company, on or about May   , 1995.
SALOMON BROTHERS INC
                   CS FIRST BOSTON
                                      GOLDMAN, SACHS & CO.
                                                    MERRILL LYNCH & CO.
The date of this Prospectus is May   , 1995.
<PAGE>   4
 
                             AVAILABLE INFORMATION
 
     Union Texas Petroleum Holdings, Inc. is subject to the informational
requirements of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and in accordance therewith files reports, proxy statements and other
information with the Securities and Exchange Commission (the "Commission").
Reports, proxy statements and other information filed by the Company may be
inspected and copied at the public reference facilities maintained by the
Commission at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington,
D.C. 20549, and at the Commission's Regional Offices located at 7 World Trade
Center, New York, NY 10048 and Citicorp Center, 500 West Madison Street, Suite
1400, Chicago, IL 60601. Copies of such materials can be obtained by mail from
the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Judiciary Plaza, Washington, D.C. 20549, at prescribed rates. In addition, the
Company's Common Stock is listed on the New York Stock Exchange and the Pacific
Stock Exchange, and the Company's 8.25% Senior Notes due 1999 are listed on the
New York Stock Exchange. The Company's reports, proxy statements and other
information filed under the Exchange Act may also be inspected and copied at the
offices of the New York Stock Exchange, 20 Broad Street, New York, NY 10005 and
the Pacific Stock Exchange, 301 Pine Street, San Francisco, CA 94104.
 
     The Company has filed with the Commission a Registration Statement on Form
S-3 (herein, together with all amendments and exhibits, referred to as the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"). This Prospectus does not contain all of the information set
forth in the Registration Statement, certain parts of which have been omitted in
accordance with the rules and regulations of the Commission. For further
information, reference is hereby made to the Registration Statement, and to the
exhibits and schedules filed therewith. All of these documents may be inspected
without charge at the Commission's principal office in Washington, D.C., and
copies thereof may be obtained from the Commission at the prescribed rates or
may be examined without charge at the public reference facilities of the
Commission.
                            ------------------------
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed with the Commission (File No. 1-9019)
pursuant to the Exchange Act are incorporated herein by reference:
 
          (1) The Company's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1994;
 
          (2) The Company's Current Reports on Form 8-K dated January 20, 1995,
     February 7, 1995, February 22, 1995, March 16, 1995, March 17, 1995 and
     April 10, 1995;
 
          (3) The description of the Company's Common Stock, which is contained
     in the Registration Statement on Form 8-A dated August 6, 1987, filed by
     the Company to register such securities under Section 12 of the Exchange
     Act, as amended by amendments on Form 8 dated September 16, 1987, September
     21, 1987 and September 24, 1987; and
 
          (4) All other documents filed by the Company pursuant to Section
     13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of
     this Prospectus and prior to the termination of the offering made hereby.
 
     Any statement contained in a document all or a portion of which is
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of this Prospectus to the extent that a
statement contained herein or in any subsequently filed document which also is
or is deemed to be incorporated by reference herein modifies or supersedes such
statement. Any statement so modified shall not be deemed to constitute a part of
this Prospectus except as so modified, and any statement so superseded shall not
be deemed to constitute part of this Prospectus.
 
     The Company will provide without charge to each person to whom a copy of
this Prospectus is delivered, upon the request of any such person, a copy of any
or all documents which are incorporated herein by reference, other than exhibits
to such documents (unless such exhibits are specifically incorporated by
reference into such documents). Requests should be directed to the Company, at
its principal executive offices at 1330 Post Oak Boulevard, Houston, TX 77056,
Attention: Corporate Secretary, telephone (713) 623-6544.
 
     Quantities of natural gas are expressed in this Prospectus in terms of
thousand cubic feet ("Mcf"), million cubic feet ("MMcf") or billion cubic feet
("Bcf"). Oil is quantified in terms of barrels ("Bbls"). Gas is converted into a
barrel of oil equivalent ("boe") based on 5.8 Mcf of gas to one barrel of oil.
 
                            ------------------------
 
IN CONNECTION WITH THE OFFERINGS, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET. SUCH
TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK AND PACIFIC STOCK EXCHANGES OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                        2
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information appearing elsewhere in this Prospectus. As used herein, the
"Company" means Union Texas Petroleum Holdings, Inc. and its subsidiaries unless
the context requires otherwise. The address and telephone number of the
Company's principal executive offices are 1330 Post Oak Boulevard, Houston,
Texas 77056, (713) 623-6544. Unless indicated otherwise, the information
contained in this Prospectus assumes that the Underwriters' over-allotment
options are not exercised.
 
THE COMPANY
 
     The Company, the successor to a corporation founded in 1896, is an
independent (non-integrated) oil and gas company with worldwide operations. At
December 31, 1994, the Company had proved oil and gas reserves of 411 million
boe. The Company's average net daily oil and gas production during 1994 and the
first three months of 1995 was approximately 48,000 Bbls and 421 MMcf and 50,000
Bbls and 473 MMcf, respectively. All of the Company's oil and gas producing
activities are presently conducted outside of the U.S., primarily in the U.K.
sector of the North Sea, Indonesia and Pakistan. Approximately 90% of the
Company's oil and gas revenues are indexed to world crude oil prices. The
Company also owns an interest in and operates a U.S.-based petrochemicals
business, which includes a 41.67% interest in a plant with a gross capacity to
produce approximately 1.2 billion pounds of ethylene annually.
 
     The Company's strategic focus is to build shareholder value through
developing its core holdings, conducting an active exploration program, pursuing
oil and gas acquisition opportunities and continuing to control costs. The
Company's current exploration activity includes interests in Alaska, Argentina,
Tunisia, Vietnam, Ireland, the U.K., Italy, Pakistan and eastern Indonesia.
Also, as part of its growth strategy, the Company has recently acquired an
interest in the Britannia field, the largest undeveloped natural gas and
condensate field in the U.K. North Sea.
 
     Capital expenditures (which exclude capitalized interest and acquisition
costs) by the Company in 1994 totaled $131 million. Capital expenditures for
1995 are estimated to be $212 million, of which approximately one-third is
allocated to exploration activities.
 
     U.K. North Sea Operations. The Company's principal properties in the U.K.
North Sea are interests in the Piper, Claymore, Scapa, Saltire and Chanter oil
fields, in each of which the Company owns a 20% working interest, and the Sean
gas fields, in which the Company owns a 25% working interest. Major development
projects undertaken by the Company at the Piper and Saltire fields were
substantially completed in 1993. The Company's net daily production from the
Piper and Claymore blocks averaged approximately 38,000 boe in 1994 as compared
to 28,300 boe in 1993 and 13,200 boe in 1992.
 
     In November 1994, the Company acquired a 9.42% interest in the Britannia
field for L100.6 million (approximately $159 million). The Company's share of
total development costs for Britannia, at current exchange rates, is estimated
to be approximately $200 million, with initial production expected in late 1998.
At year-end 1994, the Company recorded 38 million boe of proved undeveloped
reserves associated with this acquisition.
 
     Indonesia Operations. The Company's Indonesian activities consist primarily
of its 37.81% working interest in a joint venture that produces natural gas and,
to a lesser extent, oil and condensate from several fields in East Kalimantan,
Indonesia. The natural gas is converted into liquefied natural gas ("LNG") at
the Indonesian-owned LNG plant at Bontang Bay and is sold under contracts at
prices that are based on a "basket" of world crude oil prices. In 1994,
shipments from this plant were 247 cargoes (108 Bcf net to the Company). The
Company holds its interests in this joint venture both directly through a wholly
owned subsidiary and indirectly through Unimar Company ("Unimar"), a 50/50
partnership with a subsidiary of a U.K. company, LASMO plc.
 
     Pakistan Operations. The Company also participates through a joint venture
in Pakistan for the exploration and production of oil and gas with working
interests of 30% and 25.5% in the currently
 
                                        3
<PAGE>   6
 
producing fields. The Company is operator of the joint venture which produced
approximately one-third of Pakistan's total domestic oil output in 1994.
 
     Petrochemicals Business. In the United States, the Company operates the
Geismar ethylene plant near Baton Rouge, Louisiana, in which it owns a 41.67%
interest. The plant has the gross capacity to produce approximately 1.2 billion
pounds of ethylene annually. Improved ethylene margins during the last six
months of 1994 had a positive impact on the Company's cash flow and net income.
By December 1994, margins had risen to approximately 12 cents per pound, up from
about 1 cent at the beginning of the year. The Company's ethylene margins
averaged 6 cents per pound for the full year 1994. During the first quarter of
1995, ethylene margins averaged 16 cents per pound.
 
THE OFFERINGS
 
<TABLE>
<S>                                                <C>
Common Stock offered by the Selling Shareholder:
  United States Offering........................   8,000,000 shares
  International Offering........................   2,000,000 shares
          Total(1)..............................   10,000,000 shares
Common Stock to be outstanding before and after
  the Offerings(2)..............................   87,666,148 shares
NYSE symbol for the Common Stock................   UTH
Use of Proceeds.................................   The Shares are being offered by the
                                                   Selling Shareholder. The Company will not
                                                   receive any of the proceeds.
</TABLE>
 
- ------------
 
(1) Does not include up to 1,500,000 shares of Common Stock which may be sold by
    the Selling Shareholder pursuant to the Underwriters' over-allotment
    options. See "Underwriting."
 
(2) Based upon outstanding shares as of March 31, 1995 and exclusive of up to
    3,499,788 shares issuable on the exercise of stock options in connection
    with employee benefit plans. See "Capitalization" and "Management
    Developments."
 
SELLING SHAREHOLDER AND PRINCIPAL SHAREHOLDER
 
     The Common Stock is being offered on behalf of two limited partnerships,
Petroleum Associates, L.P. and KKR Partners II, L.P. (the "KKR Partnerships" or,
collectively, the "Selling Shareholder"), both of which are affiliated with
Kohlberg Kravis Roberts & Co. ("KKR"). Following the Offerings and assuming no
exercise of the over-allotment options, the Selling Shareholder will own
23,333,334 shares of Common Stock, representing approximately 27% of the
outstanding Common Stock. The KKR Partnerships and their general partners will
continue to be able to exercise effective control over the Company through their
representation on the Board of Directors of the Company (the "Board") and by
reason of their substantial voting power with respect to the election of
directors and actions submitted to a vote of stockholders. See "Selling
Shareholder and Principal Shareholder."
 
                                        4
<PAGE>   7
 
SUMMARY FINANCIAL DATA
 
     The following summary financial data for the three years ended December 31,
1994, has been derived from the consolidated financial statements of the Company
and should be read in conjunction with the consolidated financial statements and
notes thereto incorporated herein by reference and "Capitalization," "Selected
Consolidated Financial Data" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations" included elsewhere in this
Prospectus. The financial information presented below for the three-month
periods ended March 31, 1994 and 1995, reflects all normal and recurring
adjustments which, in the opinion of management, are necessary for a fair
presentation of the Company's consolidated results of operations and financial
position for such periods. The information shown for the three-month periods is
not necessarily indicative of full year results.
 
<TABLE>
<CAPTION>
                                                                                                       THREE MONTHS ENDED
                                                                 YEARS ENDED DECEMBER 31,                   MARCH 31,
                                                            -----------------------------------       ---------------------
                                                             1992          1993          1994          1994          1995
                                                            -------       -------       -------       -------       -------
<S>                                                         <C>           <C>           <C>           <C>           <C>
                                                                         (IN MILLIONS, EXCEPT PER SHARE DATA)
INCOME STATEMENT DATA:
  Total revenues.........................................   $   714       $   697       $   770       $   201       $   246
  Net income before extraordinary items and the
    cumulative effect of changes in accounting
    principles...........................................       110            31            67            27            47
  Net income(a)..........................................        14            27            67            27            47
  Net income (loss) applicable to common
    stockholders(a)......................................       (17)           27            67            27            47
  Share data:
  Net income (loss) per share of common stock............      (.26)          .31           .76           .30           .53
  Common stock dividends per share.......................       .20           .20           .20           .05           .05
  Average number of shares outstanding...................      85.8          87.2          87.6          87.7          87.6
BALANCE SHEET DATA (AT PERIOD END):
  Cash and cash equivalents..............................   $   101       $    18       $     8       $    11       $    14
  Total assets...........................................     1,581         1,339         1,545         1,324         1,564
  Total debt.............................................       483           450           538           443           510
  Redeemable preferred stock.............................        75            --            --            --            --
  Stockholders' equity...................................       269           281           349           305           403
CASH FLOW DATA:
  Net cash provided by operating activities..............   $   241       $   191       $   215       $    47       $    61
  Capital expenditures(b)................................       308           192           131            23            34
</TABLE>
 
- ------------
 
(a) In 1992, the Company recognized a $76 million charge for the cumulative
    effect of adopting two new accounting standards and an extraordinary loss of
    $20 million as a result of the early redemption of debt.
 
(b) Capital expenditures include the Company's proportional share of such
    expenditures through Unimar, an equity partnership.
 
                                        5
<PAGE>   8
 
SUMMARY OPERATING INFORMATION
 
     The following summary of operating information has been derived from the
supplementary oil and gas data to the Company's consolidated financial
statements and other records of the Company and should be read in conjunction
with such data in the Company's consolidated financial statements incorporated
herein by reference.
 
     The proved reserves and production statistics for the Company set forth
below and elsewhere in this Prospectus are net of royalties and operating
interests owned by others, unless otherwise indicated. Gas is converted into a
boe based on 5.8 Mcf of gas to one barrel of oil.
 
<TABLE>
<CAPTION>
                                                                                                AT DECEMBER 31,
                                                                                         ------------------------------
                                                                                          1992        1993        1994
                                                                                         ------      ------      ------
<S>                                                                                      <C>         <C>         <C>
NET PROVED DEVELOPED AND UNDEVELOPED OIL AND GAS RESERVES:
  Crude oil, including condensate and natural gas liquids (millions of barrels)
    United Kingdom.....................................................................      76          69          74
    Indonesia..........................................................................      13          18          19
    Pakistan...........................................................................       6           5           4
    Equity Partnership.................................................................       5           6           7
                                                                                         ------      ------      ------
      Total............................................................................     100          98         104
                                                                                          =====       =====       =====
  Natural gas (billion cubic feet)
    United Kingdom.....................................................................      90         139         320
    Indonesia..........................................................................     798       1,009         973
    Pakistan...........................................................................     101         102          98
    Equity Partnership.................................................................     295         389         385
                                                                                         ------      ------      ------
      Total............................................................................   1,284       1,639       1,776
                                                                                          =====       =====       =====
NET PROVED DEVELOPED OIL AND GAS RESERVES:
  Crude oil, including condensate and natural gas liquids (millions of barrels)
    United Kingdom.....................................................................      25          34          57
    Indonesia..........................................................................      12          15          17
    Pakistan...........................................................................       3           3           3
    Equity Partnership.................................................................       5           5           7
                                                                                         ------      ------      ------
      Total............................................................................      45          57          84
                                                                                          =====       =====       =====
  Natural gas (billion cubic feet)
    United Kingdom.....................................................................      75         131         149
    Indonesia..........................................................................     725         785         813
    Pakistan...........................................................................      35          39          52
    Equity Partnership.................................................................     267         300         321
                                                                                         ------      ------      ------
      Total............................................................................   1,102       1,255       1,335
                                                                                          =====       =====       =====
</TABLE>
 
                                        6
<PAGE>   9
 
<TABLE>
<CAPTION>
                                                                                                                        
                                                                                                               THREE   
                                                                                                               MONTHS   
                                                                                                                ENDED   
                                                                            YEARS ENDED DECEMBER 31,           MARCH 31,
                                                                         -------------------------------       --------
                                                                          1992        1993        1994           1995
                                                                         -------     -------     -------       --------
<S>                                                                      <C>         <C>         <C>           <C>
AVERAGE NET PRODUCTION PER DAY:
  Crude oil, including condensate (thousands of barrels)
    United Kingdom(a)..................................................       13          27          35            37
    Indonesia..........................................................        5           6           6             6
    Pakistan...........................................................        5           5           5             5
    Equity Partnership.................................................        2           2           2             2
                                                                         -------     -------     -------       -------
        Total(b).......................................................       25          40          48            50
                                                                          ======      ======      ======        ======
  Natural gas (million cubic feet)
    United Kingdom(a)..................................................        7           8          24            44
    Indonesia(c).......................................................      244         242         266           290
    Pakistan...........................................................       39          43          43            43
    Equity Partnership(c)..............................................       81          80          88            96
                                                                         -------     -------     -------       -------
        Total..........................................................      371         373         421           473
                                                                          ======      ======      ======        ======
AVERAGE SALES PRICE:
  Crude oil, including condensate (dollars per barrel)
    United Kingdom(a)..................................................  $ 18.47     $ 15.10     $ 14.99       $ 16.34
    Indonesia..........................................................    20.69       17.26       15.78         17.28
    Pakistan...........................................................    16.32       15.04       13.43         14.62
    Equity Partnership.................................................    20.69       17.26       15.78         17.28
  Natural gas (dollars per thousand cubic feet)
    United Kingdom(a)..................................................     3.69        2.49        2.57          3.01
    Indonesia(c).......................................................     3.22        3.00        2.72          2.94
    Pakistan...........................................................     1.09        1.26        1.07          1.30
    Equity Partnership(c)..............................................     3.22        3.00        2.72          2.94
</TABLE>
 
- ------------
 
(a)  Includes Piper activity beginning early 1993 and Saltire and Chanter
     activity beginning in the middle of 1993.
 
(b)  Excludes natural gas liquids production of 1,000, 2,000, 3,000 and 3,000
     barrels per day for 1992, 1993, 1994 and the three months ended March 31,
     1995, respectively.
 
(c)  Includes gas consumed in the operation of the liquefied natural gas plant
     in the Company's Indonesian joint venture.
 
                                        7
<PAGE>   10
 
                                USE OF PROCEEDS
 
     All of the shares of Common Stock offered hereby are being offered by the
Selling Shareholder. The Company will not receive any of the proceeds of the
Offerings.
 
                 SELLING SHAREHOLDER AND PRINCIPAL SHAREHOLDER
 
     All of the shares of Common Stock offered hereby are being sold by the KKR
Partnerships (which are referred to in this Prospectus as a single shareholder,
the "Principal Shareholder"). Petroleum Associates, L.P. and KKR Partners II,
L.P., currently hold 33,047,334 shares and 286,000 shares, respectively, or
approximately 38% in the aggregate of the outstanding shares of Common Stock.
Shares sold in each of the U.S. Offering and the International Offering,
including shares sold pursuant to any exercise of the over-allotment options,
will be sold by each of the KKR Partnerships in proportion to the amount of
their holdings. Following the Offerings, the Selling Shareholder will hold
approximately 27% of the outstanding shares of Common Stock (assuming no
exercise of the over-allotment options).
 
     As a result of the KKR Partnerships' stock ownership of the Company, the
KKR Partnerships and their general partners will continue to be able to exercise
effective control over the Company, through their representation on the Board
and by reason of their substantial voting power with respect to the election of
directors and actions requiring stockholder approval. KKR Associates, the sole
general partner of the KKR Partnerships, is a limited partnership of which Henry
R. Kravis, George R. Roberts, Michael W. Michelson, Saul A. Fox, James H.
Greene, Jr., Edward A. Gilhuly (each a director of the Company), Robert I.
MacDonnell, Paul E. Raether, Michael T. Tokarz, Perry Golkin, Clifton S. Robbins
and Scott Stuart are the general partners. See "Description of Capital Stock."
 
     The KKR Partnerships and the Company are parties to a consulting agreement
(the "Consulting Agreement"), a copy of which is incorporated by reference as an
exhibit to the Registration Statement of which this Prospectus is a part. Such
Consulting Agreement provides for the payment to KKR by the Company of an annual
fee for financial advisory services. In 1992, 1993 and 1994, KKR was paid
approximately $465,000, $512,000 and $563,000, respectively. The Company will
remain obligated to pay these fees until such time as the KKR Partnerships shall
own less than 20% of the shares of Common Stock outstanding. In addition, each
non-employee director of the Company, including the directors affiliated with
KKR, receives $40,000 per annum for serving on the Board.
 
     During 1992, the Company completed a financial restructuring through a
series of transactions that significantly streamlined its capital structure and
reduced its financing costs. Included in such transactions was the redemption
for $300 million of all its outstanding warrants to purchase Common Stock, $145
million of which was received by the Selling Shareholder. Such warrants were
redeemed with funds borrowed under the Company's then-existing credit facility.
Pursuant to the sale in 1991 of certain U.S. businesses of the Company, the KKR
Partnerships were indemnified as affiliates of the Company by the buyers in such
transactions.
 
     The KKR Partnerships have agreed with the Underwriters not to offer, sell,
contract to sell or otherwise dispose of any shares of Common Stock or
securities convertible into shares of Common Stock for 90 days after the date of
this Prospectus, without the consent of the representatives of the Underwriters.
In addition, the Company has agreed with the Underwriters not to offer, sell,
contract to sell or otherwise dispose of any shares of Common Stock or
securities convertible into shares of Common Stock, except in connection with
stock options or other incentive benefit plans, for 90 days after the date of
this Prospectus without the consent of the representatives of the Underwriters.
See "Underwriting."
 
     The Company and the Principal Shareholder entered into an agreement dated
as of September 30, 1987 (the "Registration Agreement"), a copy of which is
incorporated by reference as an exhibit to the Registration Statement of which
this Prospectus is a part, pursuant to which the Company agreed to register the
offer and sale of shares of Common Stock held by the Selling Shareholder,
including the shares of Common Stock offered hereby, under the Securities Act,
and the Selling Shareholder and the Company agreed to indemnify each other
against certain liabilities, including liabilities under the
 
                                        8
<PAGE>   11
 
Securities Act in connection with the sale of the shares pursuant to the
Registration Agreement, and to contribute to payments that they may be required
to make in respect thereof. Pursuant to the Registration Agreement, the Selling
Shareholder is required to pay the underwriting discounts and commissions and
transfer taxes, if any, associated with the Offerings, and the Company is
required to pay substantially all expenses directly associated with the
Offerings, including, without limitation, the cost of registering the shares
offered hereby, including applicable registration and filing fees, printing
expenses, certain underwriting expenses and applicable expenses for legal
counsel and accountants incurred by the Company or the Selling Shareholder.
 
     Certain executive officers and key employees have registration rights with
respect to shares of the Company's Common Stock purchased pursuant to stock
subscription agreements with the Company. These registration rights permit the
purchasers to require the Company to seek to register a pro rata portion of
their shares in the event that the Company seeks to register in a public
offering some or all of the Common Stock owned by the Selling Shareholder. The
executive officers and key employees have waived such registration rights in
connection with the Offerings.
 
                                        9
<PAGE>   12
 
                        MARKET AND DIVIDEND INFORMATION
 
     The Common Stock of the Company is listed on the New York Stock Exchange
(the "NYSE") and the Pacific Stock Exchange. The following table sets forth the
range of high and low sale prices as reported on the NYSE Composite Transactions
Tape during the periods indicated.
 
<TABLE>
<CAPTION>
                                  PERIOD                                   HIGH       LOW
    -------------------------------------------------------------------   ------     ------
    <S>                                                                   <C>        <C>
    1992
      First Quarter....................................................   $20 7/8    $16 7/8
      Second Quarter...................................................    18 3/4     15 5/8
      Third Quarter....................................................    18 7/8     16
      Fourth Quarter...................................................    20 1/8     17 1/4
    1993
      First Quarter....................................................   $24 7/8    $17 7/8
      Second Quarter...................................................    26 1/8         21
      Third Quarter....................................................    27 1/2     22 1/2
      Fourth Quarter...................................................    26 1/2         19
    1994
      First Quarter....................................................   $22        $16 5/8
      Second Quarter...................................................    20 1/8     16 1/4
      Third Quarter....................................................    20 3/8     17
      Fourth Quarter...................................................    21 7/8     18 1/8
    1995
      First Quarter....................................................   $23 1/8    $18 1/4
      Second Quarter (through April 20, 1995)..........................    23 7/8     22 1/2
</TABLE>
 
     The last reported sale price of the Common Stock on the NYSE on April 20,
1995, was $23 3/8 per share.
 
     Holders of Common Stock are entitled to receive cash dividends when
declared by the Board out of funds legally available. Beginning with the second
quarter of 1988, the Company has paid regular quarterly dividends on the Common
Stock of $.05 per share each quarter. On April 13, 1995, the Company announced a
dividend of $.05 per share on the Common Stock to stockholders of record as of
April 28, 1995, payable on May 15, 1995. The timing and amount of future
dividends will depend upon the Company's earnings and cash requirements and
other factors deemed relevant by the Board. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations -- Financial Condition
and Liquidity" and "Description of Capital Stock" for certain restrictions
imposed by the Company's credit facilities upon the Company with respect to the
payment of dividends on the Common Stock.
 
                                       10
<PAGE>   13
 
                                  CAPITALIZATION
 
     The following table sets forth the consolidated capitalization of the
Company as of March 31, 1995. The sale of the shares of the Common Stock in the
Offerings by the Selling Shareholder will not affect the capitalization of the
Company, other than the estimated expenses of approximately $700,000 that will
be paid by the Company, which expenses are not reflected in the table. The
following table should be read in conjunction with the Company's consolidated
financial statements and notes thereto incorporated by reference in this
Prospectus.
 
<TABLE>
<CAPTION>
                                                                                    AT
                                                                                   MARCH
                                                                                    31,
                                                                                   1995
                                                                                   -----
    <S>                                                                            <C>
                                                                                    (IN
                                                                                   MILLIONS)
    Debt(a)
      Short-term debt, including current maturities of long-term debt...........   $  74
      Long-term debt
         Credit facilities......................................................     207
         8.25% Senior Notes due 1999............................................     100
         8 3/8% Senior Notes due 2005...........................................     125
         Other..................................................................       4
                                                                                   -----
           Total debt...........................................................     510
                                                                                   -----
    Stockholders' equity
      Common stock, par value $.05 per share; 200,000,000 shares
         authorized(b)..........................................................       4
      Capital in excess of par value............................................      20
      Retained earnings.........................................................     437
      Treasury stock(c).........................................................      (3)
      Cumulative foreign exchange translation adjustment and other..............     (55)
                                                                                   -----
           Total stockholders' equity...........................................     403
                                                                                   -----
              Total capitalization..............................................   $ 913
                                                                                   =====
</TABLE>
 
- ------------
 
(a) In April 1995, the Company issued an aggregate $75 million principal amount
    of 8 1/2% Senior Notes due 2007 pursuant to a public offering. The net
    proceeds from the offering were approximately $74.1 million, which the
    Company used to reduce indebtedness under its $350 million credit facility
    and its uncommitted and unsecured lines of credit. See "Management's
    Discussion and Analysis of Financial Condition and Results of Operations."
 
(b) As of March 31, 1995, there were 87,666,148 shares of Common Stock issued
    and outstanding. This amount does not reflect 3,499,788 shares issuable as
    of such date on the exercise of stock options granted by the Company in
    connection with employee benefit plans. See "Management Developments."
 
(c) At March 31, 1995, the Company held in treasury 163,135 shares of Common
    Stock at cost, including shares purchased under the Company's stock
    repurchase plan adopted in April 1994, which authorized the repurchase of up
    to 2,000,000 shares of Common Stock. See "Management's Discussion and
    Analysis of Financial Condition and Results of Operations -- Financial
    Condition and Liquidity."
 
                                       11
<PAGE>   14
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The following selected consolidated financial information has been derived
from the consolidated financial statements of the Company for each of the three
years in the period ended December 31, 1994, which statements have been audited
by Price Waterhouse LLP, and the three-month periods ended March 31, 1994 and
1995. The information set forth below should be read in conjunction with the
Company's consolidated financial statements and notes thereto incorporated
herein by reference and "Capitalization" and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included elsewhere in
this Prospectus. The financial information presented below for the three-month
periods ended March 31, 1994 and 1995, reflects all normal and recurring
adjustments which, in the opinion of management, are necessary for a fair
presentation of the Company's consolidated results of operations and financial
position for such periods. The information shown for the three-month periods is
not necessarily indicative of full year results.
 
<TABLE>
<CAPTION>
                                                                                                       THREE MONTHS ENDED
                                                                      YEARS ENDED DECEMBER 31,             MARCH 31,
                                                                   ------------------------------      ------------------
                                                                    1992        1993        1994        1994        1995
                                                                   ------      ------      ------      ------      ------
                                                                            (IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                                                                <C>         <C>         <C>         <C>         <C>
STATEMENT OF CONSOLIDATED INCOME DATA:
Revenues
  Sales and operating revenues...................................  $  669      $  682      $  748      $  194      $  240
  Interest income and other revenues.............................      32           6           2          --           1
  Net income of equity investee..................................      13           9          20           7           5
                                                                   ------      ------      ------      ------      ------
      Total......................................................     714         697         770         201         246
Costs and other deductions
  Product costs and operating expenses...........................     318         301         300          64          79
  Exploration expenses...........................................      67          94          53          13          16
  Depreciation, depletion and amortization.......................      77         243(b)      169          47          47
  Selling, general and administrative expenses...................      27          24          25           6           6
  Interest expense...............................................       4           6          11           1           5
  Preferred dividends of a subsidiary............................       2           2          --          --          --
  Other charges..................................................       6          --          --          --          --
                                                                   ------      ------      ------      ------      ------
Income (loss) before income taxes, extraordinary items and
  cumulative effect of changes in accounting principles..........     213          27         212          70          93
Provision for (benefit from) income taxes........................     103          (4)        145          43          46
                                                                   ------      ------      ------      ------      ------
Income before extraordinary items and cumulative effect of
  changes in accounting principles...............................     110          31          67          27          47
Extraordinary items(a)...........................................     (20)         --          --          --          --
Cumulative effect of changes in accounting principles............     (76)         (4)         --          --          --
                                                                   ------      ------      ------      ------      ------
Net income.......................................................  $   14      $   27      $   67      $   27      $   47
Net income (loss) applicable to common stockholders..............     (17)         27          67          27          47
                                                                   ======      ======      ======       =====      ======
Net income (loss) per share of common stock......................  $ (.26)     $  .31      $  .76      $  .30      $  .53
                                                                   ======      ======      ======       =====      ======
Common stock dividends per share.................................  $  .20      $  .20      $  .20      $  .05      $  .05
Average number of shares outstanding.............................    85.8        87.2        87.6        87.7        87.6
STATEMENT OF CASH FLOW DATA:
Net cash provided by operating activities........................  $  241      $  191      $  215      $   47      $   61
                                                                   ------      ------      ------      ------      ------
Cash flows from investing activities
  Additions to property, plant and equipment.....................    (296)       (144)       (300)        (37)        (27)
  Cash (required) provided by equity investee....................      29          20           9          (6)          8
  Cash (required) provided by sale of businesses, net............     (18)        (43)         (2)         (1)         (1)
                                                                   ------      ------      ------      ------      ------
  Net cash provided (required) by investing activities...........    (285)       (167)       (293)        (44)        (20)
                                                                   ------      ------      ------      ------      ------
Cash flows from financing activities
  Net proceeds from issuance of long-term notes..................      --          --          --          --         123
  Net proceeds (payments) from debt under the credit
    facilities...................................................     465          30          81          --        (119)
  Payment to settle long-term debt and capitalized lease
    obligations..................................................    (529)       (118)        (37)        (35)         --
  Redemption of Preferred Auction Rate Stock.....................      --         (75)         --          --          --
  Redemption of preferred stock and common stock warrants........    (500)         --          --          --          --
  Purchase of treasury stock.....................................      --          --          (6)         --          --
  Proceeds from issuance of treasury stock.......................      --          --           1          --          --
  Proceeds from issuance of common stock.........................       4          18          --          --          --
  Net proceeds (payments) from short-term borrowings.............       6          55          47          29         (36)
  Dividends paid.................................................     (47)        (17)        (18)         (4)         (4)
                                                                   ------      ------      ------      ------      ------
      Net cash provided (required) by financing activities.......    (601)       (107)         68         (10)        (36)
                                                                   ------      ------      ------      ------      ------
Net increase (decrease) in cash and cash equivalents.............  $ (645)     $  (83)     $  (10)     $   (7)     $    5
                                                                   ======      ======      ======       =====      ======
</TABLE>
 
- ------------
 
See accompanying notes.
                                             (Table continued on following page)
 
                                       12
<PAGE>   15
 
<TABLE>
<CAPTION>
                                                                                                        THREE MONTHS ENDED
                                                                    YEARS ENDED DECEMBER 31,                MARCH 31,
                                                                ---------------------------------      --------------------
                                                                 1992         1993         1994         1994         1995
                                                                -------      -------      -------      -------      -------
                                                                                       (IN MILLIONS)
<S>                                                             <C>          <C>          <C>          <C>          <C>
SELECTED BALANCE SHEET DATA:
  Cash and cash equivalents...................................  $   101      $    18      $     8      $    11      $    14
  Property, plant and equipment (net).........................    1,199        1,089        1,286        1,064        1,295
  Total assets................................................    1,581        1,339        1,545        1,324        1,564
  Total debt..................................................      483          450          538          443          510
  Redeemable preferred stock..................................       75           --           --           --           --
  Stockholders' equity........................................      269          281          349          305          403
</TABLE>
 
- ------------
 
(a) In 1992, the Company recognized a $76 million charge for the cumulative
    effect of adopting two new accounting standards and an extraordinary loss of
    $20 million as a result of the early redemption of debt.
 
(b) During 1993, the Company recorded a non-cash charge to depreciation,
    depletion and amortization of $103 million pretax ($48 million after-tax)
    for the write-down of its investment in the U.K. North Sea's Piper field.
 
                                       13
<PAGE>   16
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The following discussion should be read in conjunction with the financial
statements and notes contained in the Company's 1994 Annual Report on Form 10-K,
and condensed financial statements and notes contained in the Company's Report
on Form 10-Q for the quarter ended March 31, 1995.
 
RESULTS OF OPERATIONS -- THREE MONTHS ENDED MARCH 31, 1995 COMPARED WITH THREE
MONTHS ENDED MARCH 31, 1994
 
     Net income for the three months ended March 31, 1995, was $47 million, or
$.53 per share as compared to net income of $27 million, or $.30 per share
reported for the same period in 1994. The current quarter was favorably impacted
by higher U.S. ethylene margins and sales volumes and higher international oil
and gas prices partially offset by lower Indonesian LNG volumes.
 
     Sales and operating revenues for the three months ended March 31, 1995,
were $240 million, up from $194 million for the first quarter of 1994.
International revenues totaled $184 million as compared to $163 million for the
first quarter of 1994. In the U.K., sales and operating revenues increased by
$20 million due to higher crude prices and increased sales volumes. In
Indonesia, sales were $1 million below 1994 as higher crude oil and LNG prices
were offset by lower LNG volumes, attributable to the contracted cargo mix which
resulted in a lower average participation interest in cargoes delivered for the
quarter. It is not expected that these lower LNG volumes will be made up during
the remainder of 1995. In Pakistan, sales were $2 million above 1994 primarily
due to higher crude oil and natural gas prices.
 
     Average prices received and volumes sold by the Company's major operations
during the first quarter of 1995 and 1994, respectively, were as follows:
 
<TABLE>
<CAPTION>
                                                                                   VOLUMES
                                                            PRICES              (000S PER DAY)
                                                     --------------------      ----------------
                                                       1995        1994         1995      1994
                                                     --------    --------      -------    -----
    <S>                                              <C>         <C>           <C>        <C>
    Crude oil (barrels):
      U.K..........................................  $  16.34    $  13.13           37       35
      Pakistan.....................................     14.62       12.77            5        4
      Indonesia....................................     17.28       14.72            6        7
    Indonesian LNG (Mcf)...........................      3.07        2.72          242      280
    Pakistan natural gas (Mcf).....................      1.30        1.11           43       46
    U.K. natural gas (Mcf).........................      3.01        2.88           44       41
    U.S. ethylene (pounds).........................       .28         .15        1,338      904
</TABLE>
 
     Petrochemical revenues totaled $55 million as compared to $31 million in
the first quarter of 1994, while operating profit was $19 million as compared to
$1 million in the prior period. The increase was primarily due to higher
ethylene sales prices which resulted in an increase in ethylene margins to 16
cents per pound in 1995 versus 1 cent per pound in 1994 and due to higher
volumes.
 
     Exploration expenses increased by $3 million reflecting the Company's
expanded 1995 exploration program. Interest expense increased by $4 million
during the period due to higher levels of debt, primarily due to the funding of
the Britannia acquisition during the fourth quarter of 1994 and higher interest
rates. The effective tax rate decreased from the prior year due primarily to the
increase in the U.S. petrochemical income, which is taxed at lower rates.
 
                                       14
<PAGE>   17
 
RESULTS OF OPERATIONS -- YEAR ENDED DECEMBER 31, 1994 COMPARED WITH YEAR ENDED
DECEMBER 31, 1993
 
     Net income for the year ended December 31, 1994 was $67 million, or $.76
per share, as compared to net income of $27 million, or $.31 per share reported
for the year ended December 31, 1993. Included in 1993 results are certain
non-recurring items; excluding these items, net income for the year ended
December 31, 1993, was $54 million, or $.61 per share. The 1994 earnings were
favorably impacted by higher volumes in the U.K. North Sea and Indonesia, higher
U.S. ethylene margins and lower operating expenses, partially offset by lower
oil and LNG prices and higher depreciation, depletion and amortization expense
related to the increased production.
 
     Sales and operating revenues for 1994 were $748 million, up approximately
10% from $682 million in 1993. International revenues totaled $578 million as
compared to $537 million in 1993. In the U.K., sales and operating revenues
increased $52 million as lower crude prices were more than offset by increased
production from the Piper block. In Indonesia, sales were $1 million below 1993
as a result of lower crude oil and LNG prices, which were partially offset by
higher LNG volumes. In Pakistan, sales were $10 million below 1993 primarily due
to lower prices for crude oil and natural gas.
 
     Average prices received and volumes sold by the Company's major operations
during 1994 and 1993, respectively, were as follows.
 
<TABLE>
<CAPTION>
                                                                                     VOLUMES
                                                          PRICES                 (000S PER DAY)
                                                   ---------------------       -------------------
                                                    1994          1993          1994         1993
                                                   -------       -------       ------       ------
<S>                                                <C>           <C>           <C>          <C>
Crude oil (barrels):
  U.K. ..........................................  $ 14.99       $ 15.10           34           27
  Pakistan.......................................    13.43         15.04            5            5
  Indonesia......................................    15.78         17.26            6            6
Indonesian LNG (Mcf).............................     2.85          3.17          222          198
Pakistan natural gas (Mcf).......................     1.07          1.26           43           43
U.K. natural gas (Mcf)...........................     2.57          2.49           24            8
U.S. ethylene (pounds)...........................      .20           .16        1,194        1,235
</TABLE>
 
     Production costs per boe for the Company's oil and gas activities averaged
$3.98 in 1994, down from $4.73 per boe in 1993 primarily as a result of
increased volumes in the U.K., lower LNG plant costs in Indonesia and the
benefits of a Company-wide cost containment program.
 
     The operating profit for the Company's petrochemical operations was $16
million above the prior year. The increase primarily resulted from improved
ethylene margins reflecting higher sales prices for ethylene and lower costs.
 
     The prior year's results included four non-recurring items which in the
aggregate reduced 1993 earnings by $27 million. These items included
depreciation expense of $103 million ($48 million after tax) representing a
write-down of the Company's investment in the Piper field, a $25 million charge
to exploration expense due to the write-off of the Company's investment in the
Kuvlum prospect in Alaska and a $4 million charge for the cumulative effect of
adopting a new accounting standard for postemployment benefits. Partially
offsetting these items was a $50 million tax benefit associated with changes to
U.K. tax laws.
 
     Exploration expenses decreased by $40 million due to the prior year
write-off of Kuvlum, lower worldwide operating expenditures and reduced
expenditures in the U.K. and Indonesia. Depreciation, depletion and amortization
decreased by $74 million due to the prior period's write-down of the Piper
field, which was partially offset by increased production. Interest expense
increased $5 million due to lower capitalized interest related to the Piper
redevelopment project, which was substantially completed in 1993. The effective
tax rate was essentially level with the prior period, adjusted for the
non-recurring items mentioned previously.
 
                                       15
<PAGE>   18
 
RESULTS OF OPERATIONS -- YEAR ENDED DECEMBER 31, 1993 COMPARED WITH YEAR ENDED
DECEMBER 31, 1992
 
     Net income for the year ended December 31, 1993, was $27 million, or $.31
per share, as compared to net income of $14 million, or a loss of $.26 per
share, reported for the year ended December 31, 1992. Included in 1993 results
are certain significant items related to the U.K. North Sea's Piper field write-
down, the benefit of a U.K. tax law change, the write-off of the Kuvlum prospect
in Alaska and a charge for the cumulative effect of adopting a new accounting
standard for postemployment benefits. Excluding these items, net income for the
year ended December 31, 1993, was $54 million, or $.61 per share. The prior
period's results include a $76 million charge for the cumulative effect of
adopting two new accounting standards effective January 1, 1992. The prior
period's results also include an extraordinary charge of $20 million for the
early redemption of certain of the Company's debt in early 1992. Excluding these
items, net income for the year ended December 31, 1992, was $109 million, or
$.86 per share. The 1993 earnings were negatively impacted by lower oil and
Indonesian LNG prices and decreased interest income on refunds of prior years'
PRT. The 1993 results benefitted from the elimination of preferred stock
dividends and higher worldwide oil volumes.
 
     Sales and operating revenues for 1993 were $682 million, an increase from
$669 million for 1992. International revenues totaled $537 million as compared
to $500 million in 1992. In the U.K., sales increased by $52 million primarily
due to increased production from the Piper and Saltire fields, partially offset
by lower prices. In Indonesia, sales decreased by $19 million due to lower LNG
and oil prices, partially offset by increased LNG volumes. In Pakistan, sales
increased $6 million due primarily to higher natural gas prices and higher oil
and gas volumes. The average sales price for U.K. crude oil decreased from
$18.47 to $15.10 per barrel. The average sales price received for Indonesia LNG
decreased from $3.41 per Mcf to $3.17 per Mcf. The average sales price received
for Pakistan natural gas increased from $1.09 per Mcf to $1.26 per Mcf.
 
     The Company's petrochemical operation's operating profit increased $4
million from the prior year due to lower costs. The average sales price of
ethylene ($.16 per pound) was consistent with the prior year.
 
     Interest income and other revenues in the U.K. decreased by $21 million,
primarily due to lower refunds of prior years' PRT associated with the
development costs of the Piper field. Domestic interest income and other
revenues were $5 million below the prior year primarily due to a lower level of
interest bearing cash investments held during the current year.
 
     Exploration expenses increased by $27 million primarily due to the
write-off of the Company's investment in the Kuvlum prospect in Alaska. Two
exploratory wells drilled in the third quarter indicated that the prospect was
not commercial as a stand-alone development.
 
     Depreciation increased by $166 million during 1993 due to increased
production in the North Sea and the $103 million pretax ($48 million after-tax)
write-down of the Company's investment in the Piper field.
 
     The Company's taxes decreased from the prior period primarily due to a
one-time reduction in deferred taxes as a result of a decrease in the PRT rate
in the North Sea, which had a one-time favorable impact to net income of
approximately $50 million.
 
     Earnings per share of common stock were favorably impacted by the
elimination of dividends on the preferred stock and accretion of discount on
common stock warrants. Dividends on the Series B and C Preferred Stock decreased
during the period by $30 million as a result of the redemption of this stock in
September 1992. Similarly, accretion of discount on common stock warrants
decreased in the current period by $5 million as a result of the redemption of
the warrants in September 1992.
 
     In December 1992, the Financial Accounting Standards Board ("FASB")
released Statement of Financial Accounting Standards No. 112, "Employers'
Accounting for Postemployment Benefits," which concluded that the estimated cost
of benefits provided by an employer to former or inactive employees
 
                                       16
<PAGE>   19
 
after employment but before retirement represents part of the compensation
provided to an employee in exchange for service. The Company currently provides
certain long-term benefits to disabled employees. The Company adopted the
Statement effective January 1, 1993, by recording a cumulative charge to net
income of approximately $4 million representing the estimated future obligation
for those employees currently under the long-term disability program. In prior
periods, the Company's cost of long-term disability was expensed as paid.
 
FINANCIAL CONDITION AND LIQUIDITY
 
     General. The Company's strategic focus is to build shareholder value
through developing its core holdings, conducting an active exploration program,
pursuing oil and gas acquisition opportunities and continuing to control costs.
The Company's capital expenditures for 1995 are estimated to be $212 million,
excluding capitalized interest, an increase from the previously budgeted $170
million for 1995, which is due primarily to the Britannia field development
costs. Approximately one-third of the 1995 capital budget is allocated to fund
the Company's expanded worldwide exploration program, which represents an 85%
increase over exploration program funds expended in 1994. A total of $74 million
is included in the Company's budget for exploration activities, including at
least ten exploration wells in new venture areas in Alaska, Argentina, Eastern
Indonesia, Ireland, Tunisia and Vietnam, and as many as 20 wells in ongoing
exploration programs in the Company's producing areas in the U.K. North Sea,
Indonesia and Pakistan. The budget also includes approximately $132 million for
oil and gas development programs in the Company's producing areas, including $47
million for the initial development of the Britannia field. The Company has also
budgeted approximately $5 million for its petrochemical interests in the United
States. In 1995, the Company intends to evaluate acquisition opportunities of
developed and undeveloped oil and gas reserves and to add to its production base
in the near-term. Acquisition costs are not included in the estimated capital
expenditures for 1995, but the Company believes that its financial strength and
available credit give it the financial resources to make acquisitions.
 
     As a result of the completion of large development projects for the Piper
and Saltire fields in the U.K. North Sea and a continuation of the growing
demand for Indonesian LNG, the Company experienced record levels of production
from its international operations during 1994, which increased 16% from 1993
levels. The Company's objective is for production in 1995 to exceed 1994 levels.
 
     In developing its business plan for 1995, the Company expects that it will
continue to have excess cash flow available after capital expenditures, required
debt service and normal dividends. The business plan is based upon numerous
assumptions made by management including assumptions as to the volume of oil and
gas the Company will produce from its properties and the prices received for
such production. Pricing for the Company's business plan is based on the
assumption that the spot price of West Texas intermediate will average $18.75
per barrel for 1995. Approximately 90% of the Company's oil and gas revenues are
indexed to world crude oil prices.
 
     Although management believes that the assumptions used at the time in
formulating the business plan and the resultant estimate of excess cash flow
were reasonable in light of world energy, financial and economic conditions, and
the Company's cash requirements, such conditions could change materially, and
actual results of operations, cash flows and use of cash by the Company through
1995 may vary materially from those included in the business plan.
 
     Cash flow from operations. Net cash provided by operating activities was
$61 million in the first quarter of 1995, an increase of $14 million from the
same period in the prior year. The improvement was primarily the result of
improved ethylene margins and sales volumes and higher international oil and gas
prices, partially offset by lower Indonesian LNG volumes.
 
     Net cash provided by operating activities was $215 million in 1994, an
increase of $24 million from the same period in the prior year. The increase was
primarily the result of increased U.K. oil and Indonesian LNG sales volumes and
improved ethylene margins, partially offset by lower oil and gas prices.
 
                                       17
<PAGE>   20
 
     During the last six months of 1994, ethylene margins improved significantly
from the first six months of 1994. By December 1994, margins had risen to
approximately 12 cents per pound, up from about 1 cent at the beginning of the
year. The Company's ethylene margins averaged 6 cents per pound for the full
year 1994, and the Company's petrochemical business posted 1994 operating profit
of $24 million. The Company has utilized an average 8 cents per pound ethylene
margin for the full year 1995 in its business plan for 1995. The Company
estimates that a margin improvement of an average one cent per pound for an
entire year at full capacity production can provide approximately an additional
$5 million in operating profit and net income on an annualized basis for the
petrochemical business of the Company. Ethylene margins have averaged
approximately 16 cents per pound in the first quarter of 1995. The Company
cannot predict the duration of the recent favorable trends in the ethylene
business. The ethylene business is cyclical and there can be no assurances that
margins will remain at their current levels over the near term. The prices the
Company receives for its ethylene are sensitive to many factors beyond the
control of the Company, such as worldwide and U.S. demand for petrochemicals,
inventory levels, feedstock costs and availability, plant utilization rates,
plant operations and costs and competitive capacity expansion.
 
     Capital resources. Capital expenditures for the first quarter of 1995 were
$39 million including capitalized interest of $5 million. Capital expenditures
for the first quarter of 1994 were $29 million including capitalized interest of
$6 million. The current quarter increase was principally due to development
costs for the Britannia field and increased exploration spending.
 
     Capital expenditures for 1994, exclusive of the Britannia acquisition, were
$131 million, a decrease from the prior year's expenditures of $192 million
primarily as a result of the completion of the large development projects in the
U.K. North Sea. During 1993, Piper redevelopment costs were $22 million and
Saltire development costs were $23 million. In 1994, the Company spent $45
million in Indonesia, primarily on exploration and development drilling. In
1994, 1993 and 1992, total Company capital costs incurred, including capitalized
interest, totaled $309 million (including $159 million related to the Britannia
acquisition), $218 million and $325 million, respectively.
 
     On November 4, 1994, the Company acquired from Fina Exploration Limited and
Fina Petroleum Development Limited, subsidiaries of Petrofina SA (collectively,
"Fina"), a 9.42% unit interest in the Britannia field, the largest undeveloped
natural gas and condensate field in the U.K. North Sea, for 83.8 million pounds
sterling (approximately $133 million). In December 1994, the U.K's Department of
Trade and Industry ("DTI") approved the development program for the Britannia
field. As a result of the DTI approval of the development program, the Company
made a second agreed upon payment to Fina for 16.8 million pounds sterling
(approximately $26 million) in December. At year-end 1994, the Company recorded
38 million boe as proved undeveloped reserves associated with the acquisition.
The Company expects to record additional proved reserves from the Britannia
field in the future based on the field's development results and its production
history. The Company increased oil and gas properties and equipment by $219
million, resulting from the purchase price of $159 million, financed through
debt, and an offset to deferred income taxes payable of $60 million. The
Company's share of total development costs for Britannia, at current exchange
rates, is estimated to be approximately $200 million, with $47 million budgeted
for 1995 for drilling activities and initial platform fabrication and facilities
work. Initial production from Britannia is expected in late 1998. The Britannia
field will be operated by Britannia Operator Limited, a joint venture between
Conoco (U.K.) Ltd. and Chevron U.K. Ltd. The Company has contracted to sell a
substantial portion of its share of gas from Britannia under long-term sales
agreements with several large gas purchasers in the U.K. Revenues from the
Britannia field will be subject to U.K. corporate tax but not to U.K. government
royalty or PRT.
 
     Financing activities. During 1994, the Company replaced its $650 million
unsecured revolving credit facility with three unsecured credit facilities (the
"Credit Facilities"). One of the Credit Facilities was a $100 million unsecured
credit agreement with NationsBank of Texas, N.A. ("NationsBank"), as agent, Bank
of America National Trust and Savings Association ("Bank of America") and Union
Bank of Switzerland, Houston Agency ("UBS"), as co-agents. This Credit Facility
was a revolver that provided for conversion of amounts outstanding on September
15, 1995 to a one-year term loan maturing
 
                                       18
<PAGE>   21
 
September 15, 1996. The Company has terminated this Credit Facility effective
March 31, 1995 as a result of the issuance of the new senior notes discussed
below. The Company's other two Credit Facilities are with NationsBank, as agent,
Bank of America, and UBS, as co-agents, and certain other banks. One of these
Credit Facilities is a $350 million revolver that reduces quarterly by $25
million beginning July 31, 1997 and has a final maturity of April 30, 1998. The
other Credit Facility is a $200 million revolver that provides for conversion of
outstanding amounts on April 30, 1995 to a one-year term loan maturing April 30,
1996. The Company has negotiated amendments to extend the maturities and certain
terms on the latter two Credit Facilities, subject to execution of definitive
agreements. Loans under the $350 million revolver 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 in certain events. In addition, the $350 million revolver allows the
Company to obtain up to $200 million of availability thereunder in U.S. dollar
loans that bear interest at a rate determined in a competitive bid process.
Borrowings under the Credit Facilities are guaranteed by certain subsidiaries of
the Company that also guarantee the Company's senior notes. The Credit
Facilities contain restrictive covenants, including limitations on incurrence of
additional indebtedness, asset sales and mergers or consolidations. The Credit
Facilities restrict the amount of total indebtedness incurred by the Company and
the restricted subsidiaries referred to in the Credit Facilities, which include
the guarantors and certain other subsidiaries ("Restricted Subsidiaries"), to
$750 million of senior indebtedness (including the aggregate $300 million
principal amount of senior notes described below and amounts drawn under the
Credit Facilities) and $100 million of subordinated indebtedness. Debt of
unrestricted subsidiaries and nonrecourse debt on certain assets of the Company
and its subsidiaries are not limited under the Credit Facilities, subject to
certain conditions. The sum of the senior notes and the commitments under the
Credit Facilities equals $850 million. As a result, the Company is currently
unable to fully utilize the Commitments under the Credit Facilities. However,
the Company is pursuing an amendment to the restriction on total indebtedness
under the Credit Facilities. The covenants also require maintenance of a certain
level of stockholders' equity. 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 the
other covenants in the Credit Facilities. Based on current conditions, the
Company expects to pay dividends without restriction under the Credit
Facilities. At March 31, 1995, $207 million was outstanding under the Credit
Facilities bearing interest at a weighted average rate of 6.8% per annum and
approximately $250 million was available for additional borrowing under such
existing Credit Facilities.
 
     Due to the Company's ability to obtain favorable interest rates on
short-term borrowings, uncommitted and unsecured lines of credit were
established with several banks. At March 31, 1995, $71 million was outstanding
under these lines. These amounts outstanding bear interest at a weighted average
rate of 6.9% per annum and are included in the total indebtedness restriction
under the Company's Credit Facilities and reduce amounts available under the
Company's Credit Facilities.
 
     Funding for the acquisition of the Britannia field was through the
Company's Credit Facilities and its uncommitted and unsecured lines of credit.
The Company's indirect subsidiary, Union Texas Britannia Limited ("UTBL"), which
is a wholly owned subsidiary of Union Texas Petroleum Limited ("UTPL"), has
received a commitment, subject to negotiation of definitive agreements, from
Chemical Bank, NationsBank N.A. (Carolinas) and National Westminster Bank plc
for a 150 million pounds sterling secured financing. The financing will be 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 to
refinance acquisition costs. Except for certain support by UTPL related to any
potential cost overruns in excess of the facility amount (limited to 30 million
pounds sterling), 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 will have a final maturity in
September 2005. The borrowings by UTBL, an unrestricted subsidiary, would not be
included in the total indebtedness under the Company's Credit Facilities and
will not reduce amounts available under the Credit Facilities.
 
                                       19
<PAGE>   22
 
     In March 1995, the Company publicly issued $125 million principal amount of
8 3/8% Senior Notes due 2005 (the "8 3/8% Senor Notes") at an initial public
offering price of 99.431%. In April 1995, the Company publicly issued $75
million principal amount of 8 1/2% Senior Notes due 2007 (the "8 1/2% Senior
Notes" together with the 8 3/8% Senior Notes referred to as the "Senior Notes")
at an initial public offering price of 99.658%. The net proceeds from the sale
of the 8 3/8% Senior Notes and the 8 1/2% Senior Notes were approximately $123.3
million and $74.1 million, respectively (after deducting underwriting discount,
commissions and offering expenses). The Company used such proceeds to reduce
debt under the $350 million Credit Facility and its uncommitted and unsecured
lines of credit. The Senior 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, its outstanding $100 million principal amount of
8.25% senior notes due 1999, and senior in right of payment to all subordinated
indebtedness of the Company. The Senior Notes are guaranteed by the subsidiaries
of the Company that are also guarantors under the Company's Credit Facilities
and the senior notes due 1999 and contain restrictive covenants similar to the
Company's senior notes due 1999. The Senior 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 Senior
Notes. In addition, at the 1995 Annual Meeting of Stockholders to be held May
10, 1995, the Company will seek stockholder approval to authorize a new class of
15,000,000 shares of preferred stock. The new preferred stock will provide the
Company additional financing flexibility to issue from time to time this form of
equity based on current market conditions.
 
     On January 4, 1994, Unimar, an equity partnership, redeemed the 8.25%
convertible subordinated guaranteed debentures which were due in 1995. The
Company's share of the debt redemption was approximately $18 million and was
funded by additional short-term borrowings.
 
     As of December 31, 1994, the Company's scheduled maturities of long-term
debt outstanding for the five-year period of 1995 through 1999 are approximately
$2 million, $2 million, $28 million, $300 million and $100 million,
respectively. The Company believes that it will have sufficient sources of funds
to satisfy these scheduled maturities. The Company has effected refinancing
alternatives in order to extend its 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 1994 or the first quarter of
1995.
 
     On April 27, 1994, the Board authorized the repurchase of up to 2,000,000
shares of Common Stock to be used for general corporate purposes, including
fulfilling employee benefit program obligations. No repurchases were made by the
Company during the first quarter of 1995. During 1994, the Company repurchased
307,500 shares of Common Stock at a cost of $5.6 million, a portion of which
shares were used to fund employee savings and benefit plan obligations. As of
March 31, 1995, 163,135 shares of Common Stock were held, at cost, as treasury
shares.
 
     Financial Condition. During January 1993, the Company entered into an
agreement to terminate a portion of its Houston office building lease and
accordingly made a $35 million payment to the lessor in consideration of such
agreement in March 1993 for which an accrual had been made in 1992.
 
     In each of the four quarters ended December 31, 1994, the Company declared
and paid a dividend of approximately $4.3 million on its Common Stock. In the
first quarter of 1995, the Company declared and paid a dividend of approximately
$4.4 million on its Common Stock. On April 13, 1995, the Company announced a
dividend on its Common Stock of $.05 per share to stockholders of record as of
April 28, 1995, payable on May 15, 1995.
 
     In March 1995, the Financial Accounting Standards Board ("FASB") released
Statement of Financial Accounting Standards No. 121, "Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of,"
which set forth the criteria for impairment of plant, property and equipment and
other long-lived assets. Adoption of the Statement is required for years
beginning after December 15, 1995. The Company is still reviewing the Statement;
however, the Company believes its
 
                                       20
<PAGE>   23
 
current policy on oil and gas asset impairment is consistent with this
pronouncement and that the pronouncement will have no material impact on the
Company.
 
     Effective July 1, 1993, the British Parliament enacted changes in PRT that
will have an overall positive impact on the Company's operations in the North
Sea. The changes included reforms which reduced PRT on producing fields in the
North Sea from 75% to 50% and which abolished PRT for all new fields not
licensed for development on March 16, 1993. A substantial portion of the
Company's production in the U.K. benefitted from such changes. Also enacted was
the elimination of PRT deductions for most exploration and appraisal
expenditures incurred on or after March 16, 1993, subject to limited
transitional allowances through December 31, 1994.
 
     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 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 of three months or less. At December 31, 1994, the Company
had open contracts with a net value of 5 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 also cannot predict with any degree of certainty the prices it
will receive in 1995 and future years for its crude oil, LNG, natural gas and
ethylene. In addition, uncertainty in the Middle East, policies of oil exporting
countries and worldwide demand for products affect the Company's sales. 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 service its long-term obligations and to internally generate funds
for capital expenditures will be similarly affected.
 
     Likewise, the Company's business is affected by its costs and success in
finding, developing or acquiring new reserves to replace its reserves depleted
by production. In general, the Company's volume of production from oil and gas
properties declines with the passage of time. In addition, the Company's and its
co-venturers' participation share of gas volumes supplied to support Indonesian
LNG sales contract extensions or additions will be significantly less than their
participation share under the original long-term sales contracts. The Company's
long-term strategy is to increase its production with reserve acquisitions and
successful exploration and development activities. There can be no assurances
that the Company will achieve such objectives. Except to the extent the Company
acquires additional properties containing proved reserves or conducts successful
exploration or development activities, 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. 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 acquiring, finding or developing additional reserves.
 
     The Company's overseas operations are subject to certain risks, including
expropriation of assets, governmental reinterpretation of applicable law and
contract terms, increases in taxes and government royalties, renegotiation of
contracts with foreign governments, foreign government approvals of lease,
permit or similar applications and of exploration and production plans,
political and economic instability, disputes between governments, payment
delays, export restrictions, increased environmental regulations, limits on
allowable levels of exploration and production and currency exchange losses and
repatriation restrictions, as well as changes in laws and policies governing
operations of companies with overseas operations generally. Foreign operations
and investments may also be subject to laws and
 
                                       21
<PAGE>   24
 
policies of the United States affecting foreign trade, investment and taxation
that could affect the conduct and profitability of these operations.
 
     All of the Company's activities are subject to the risks normally
associated with exploration for and production of oil and gas as well as the
production of petrochemicals. Also, the Company's activities are subject to
stringent environmental regulations. The Company believes that its operations
and facilities are in general compliance with existing environmental
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.
 
                            MANAGEMENT DEVELOPMENTS
 
     Incentive Plan. The Company has adopted, subject to shareholder approval at
its 1995 Annual Stockholders Meeting to be held on May 10, 1995, an incentive
plan allowing for the grant to employees of the Company of awards including
options, stock appreciation rights, restricted stock, performance awards, bonus
shares and other stock-based and cash awards relating to up to 4 million shares
of Common Stock. In addition, the plan would provide for an automatic initial
and annual grant of options to non-employee directors (other than directors
affiliated with the KKR Partnerships). If the plan is approved by the
shareholders, no additional stock options will be granted under any of the
Company's prior stock option plans.
 
     Succession Committee. In light of its policy mandating retirement of
officers at age 65, the Company has begun to plan for a successor to the
Chairman and Chief Executive Officer of the Company, A. Clark Johnson, who will
be 65 on December 7, 1995. The Board has created a special committee, whose
members consist of current Board members Glenn A. Cox, Edward A. Gilhuly,
Michael W. Michelson and Richard R. Shinn, to study and make recommendations to
the full Board regarding the succession issue so as to provide for an orderly
transfer of responsibilities.
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The Company is authorized to issue 200,000,000 shares of Common Stock, par
value $.05 per share, and 2,000,000 shares of Preferred Stock, par value $1.00
per share ("Preferred Stock"). As of March 31, 1995, 87,666,148 shares of Common
Stock were outstanding. The following summary is qualified in its entirety by
reference to the Company's Restated Certificate of Incorporation (the "Charter")
and the Company's Bylaws ("Bylaws"), copies of which are incorporated by
reference as exhibits to the Registration Statement of which this Prospectus is
a part.
 
COMMON STOCK
 
     Voting and Other Rights.  The Common Stock possesses ordinary voting rights
for the election of directors and in respect of other corporate matters, each
share being entitled to one vote. There are no cumulative voting rights, meaning
that the holders of a majority of the shares voting for the election of
directors can elect all the directors if they choose to do so. The Common Stock
carries no preemptive rights and is not convertible, redeemable or assessable.
The holders of Common Stock are entitled to dividends in such amounts and at
such times as may be declared by the Board. See "Market and Dividend
Information" for information regarding dividends. The Company currently expects
to be able to pay regular quarterly dividends without restriction under its
Credit Facilities. After the Offerings and assuming no exercise of the
over-allotment options, the Selling Shareholder will hold 23,333,334 shares of
the issued and outstanding Common Stock.
 
     Upon liquidation or dissolution, holders of Common Stock are entitled to
share ratably in all net assets available for distribution to stockholders after
payment of preferential amounts to holders of Preferred Stock, if any. All
outstanding shares of Common Stock, including the shares to be sold by the
Selling Shareholder, are duly authorized, validly issued, fully paid and
nonassessable.
 
                                       22
<PAGE>   25
 
     Miscellaneous.  First Chicago Trust Company of New York is the transfer
agent and the registrar for the Company's Common Stock.
 
PREFERRED STOCK
 
     There are 2,000,000 authorized and unissued shares of Preferred Stock of
the Company available for reissuance in the two series, Series B and Series C.
At the 1995 Annual Meeting of Stockholders to be held May 10, 1995, the Company
will seek approval to authorize the issuance of up to 15,000,000 shares of
preferred stock, $.01 par value ("New Preferred Stock"), and to eliminate the
provisions relating to the existing class of Preferred Stock. If approved by the
shareholders at the 1995 Annual Meeting, the Board can authorize the issuance,
at any time or from time to time, of one or more series of New Preferred Stock
at its discretion. In addition, the Board would determine all designations,
powers, preferences and the rights of such stock and any qualifications,
limitations and restrictions, including but not limited to: (i) the designation
of series and numbers of shares (up to 15,000,000 shares); (ii) the dividend
rights, if any; (iii) the rights upon liquidation or distribution of the assets
of the Company, if any; (iv) the conversion or exchange rights, if any; (v) the
redemption provisions, if any; and (vi) the voting rights, if any; provided,
that the holders of shares of New Preferred Stock will not be entitled to more
than one vote per share, when voting as a class with the holders of shares of
the Common Stock and if such New Preferred Stock is convertible into Common
Stock, then holders can receive one vote on an as converted basis.
 
SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW
 
     Section 203 of the Delaware General Corporation Law ("DGCL") prevents an
"interested stockholder" (defined in Section 203, generally, as a person owning
15% or more of a corporation's outstanding voting stock), from engaging in a
"business combination" (as defined in Section 203) with a publicly-held Delaware
corporation for three years following the date such person became an interested
stockholder unless (i) before such person became an interested stockholder, the
board of directors of the corporation approved the transaction in which the
interested stockholder became an interested stockholder or approved the business
combination; (ii) upon consummation of the transaction that resulted in the
interested stockholder's becoming an interested stockholder, the interested
stockholder owned at least 85% of the voting stock of the corporation
outstanding at the time the transaction commenced (excluding stock held by
directors who are also officers of the corporation and by employee stock plans
that do not provide participants with the rights to determine confidentially
whether shares held subject to the plan will be tendered in a tender or exchange
offer); or (iii) following the transaction in which such person became an
interested stockholder, the business combination is approved by the board of
directors of the corporation and authorized at a meeting of stockholders by the
affirmative vote of the holders of two-thirds of the outstanding voting stock of
the corporation not owned by the interested stockholder. The provisions of
Section 203 may have the effect of delaying, deferring or preventing a change of
control of the Company. The Selling Shareholder is not considered an interested
stockholder of the Company for the purposes of Section 203 of the DGCL.
 
DIRECTOR LIABILITY
 
     The Charter contains a provision that limits the liability of the Company's
directors to the fullest extent permitted by the DGCL. The provision eliminates
the personal liability of directors to the Company and its stockholders for
monetary damages for breaches of their fiduciary duty of care. As a result,
stockholders may be unable to recover monetary damages against directors for
negligent or grossly negligent acts or omissions in violation of their duty of
care. The provision does not change the liability of a director for breach of
his duty of loyalty to the Company or to stockholders, acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of
law, the declaration or payment of dividends in violation of Delaware law or in
respect of any transaction from which a director received an improper personal
benefit. The Charter provides that if the DGCL is amended to further limit such
liability, then the liability of Company directors will be limited or eliminated
to the maximum extent permitted by law as so amended.
 
                                       23
<PAGE>   26
 
                                  UNDERWRITING
 
     Subject to the terms and conditions of the U.S. Underwriting Agreement
among the Selling Shareholder, the Company and Salomon Brothers Inc, CS First
Boston Corporation, Goldman, Sachs & Co. and Merrill Lynch, Pierce, Fenner &
Smith Incorporated, as representatives of the several U.S. Underwriters (the
"U.S. Representatives"), the Selling Shareholder has agreed to sell to the
entities named below (the "U.S. Underwriters") and each of such U.S.
Underwriters has severally agreed to purchase from the Selling Shareholder, the
respective number of shares of Common Stock set forth opposite its name below:
 
<TABLE>
<CAPTION>
                                                                               NUMBER OF
         U.S. UNDERWRITER                                                       SHARES
                                                                               ---------
    <S>                                                                        <C>
    Salomon Brothers Inc....................................................
    CS First Boston Corporation.............................................
    Goldman, Sachs & Co. ...................................................
    Merrill Lynch, Pierce, Fenner & Smith
                 Incorporated...............................................
 
                                                                               ---------
              Total.........................................................   8,000,000
                                                                               =========
</TABLE>
 
     The U.S. Underwriting Agreement provides that the several U.S. Underwriters
will be obligated to purchase all the shares of Common Stock being offered in
the U.S. Offering (other than those subject to the over-allotment option
described below) if any are purchased.
 
     The U.S. Representatives have advised the Company and the Selling
Shareholder that they propose to offer Common Stock directly to the public at
the public offering price set forth on the cover page of this Prospectus and to
certain dealers at such price less a concession not in excess of $   per share.
The U.S. Underwriters may allow, and such dealers may reallow, a concession not
in excess of $   per share on sales to certain other dealers. After the initial
Offering, the price to public and concessions to dealers may be changed.
 
     The Selling Shareholder has granted to the U.S. Underwriters and the
underwriters of the International Offering (the "International Underwriters")
options to purchase up to an additional 1,200,000 shares and 300,000 shares of
Common Stock, respectively, at the initial offering price less the aggregate
underwriting discounts. Either or both options may be exercised at any time up
to 30 days after the date of this Prospectus. The Company and the Selling
Shareholder have entered into an underwriting agreement (the "International
Underwriting Agreement") with the International Underwriters providing for the
concurrent offer and sale of 2,000,000 shares of Common Stock (in addition to
the shares covered by the over-allotment option described above) in the
International Offering outside the United States and Canada. The price to public
and aggregate underwriting discount per share for the Offerings are identical.
The closing of the U.S. Offering is a condition to the closing of the
International Offering, and vice versa. The representatives of the International
Underwriters are Salomon Brothers International Limited, CS First Boston
Limited, Goldman Sachs International and Merrill Lynch International Limited.
 
                                       24
<PAGE>   27
 
     For a period of 90 days after the date of this Prospectus, the KKR
Partnerships have agreed not to offer, sell, contract to sell or otherwise
dispose of any shares of Common Stock or securities convertible into,
exercisable for or exchangeable for Common Stock or any such other capital stock
without the consent of the U.S. Representatives and the representatives of the
International Underwriters. In addition, the Company has agreed not to offer,
sell or contract to sell or otherwise dispose of any shares of Common Stock or
any securities convertible into, exercisable for or exchangeable for shares of
Common Stock, except for securities issued pursuant to the Company's stock
option or other incentive benefit plans, for 90 days after the date of this
Prospectus without the consent of the U.S. Representatives and the
representatives of the International Underwriters.
 
     The U.S. Underwriters and the International Underwriters have entered into
an Agreement Between U.S. Underwriters and International Underwriters pursuant
to which each U.S. Underwriter has agreed that, as part of the distribution of
the shares of Common Stock offered in the U.S. Offering and subject to certain
exceptions, (a) it is not purchasing any such shares for the account of an
International Person (as defined below), (b) it has not offered or sold, and
will not offer, sell, resell or deliver, directly or indirectly, any shares of
Common Stock or distribute any prospectus relating to the Common Stock to anyone
other than a U.S. or Canadian Person (as defined below) and (c) any dealer to
whom it may sell any of the shares of Common Stock will represent and agree that
it will comply with the restrictions set forth in (a) and (b) and will not
offer, sell, resell or deliver, directly or indirectly, any of the shares or
distribute any prospectus relating to the Common Stock to any other dealer who
does not so represent and agree. In addition, pursuant to the Agreement Between
U.S. Underwriters and International Underwriters, each International Underwriter
has agreed that, as part of the distribution of the shares of Common Stock
offered in the International Offering and subject to certain exceptions, (1) it
is not purchasing any such shares for the account of anyone other than an
International Person, (2) it has not offered or sold, and will not offer, sell,
resell or deliver, directly or indirectly, any shares of Common Stock or
distribute any prospectus relating to the Common Stock to anyone other than an
International Person and (3) any dealer to whom it may sell any of the shares of
Common Stock will represent and agree that it will comply with the restrictions
set forth in (1) and (2) and will not offer, sell, resell or deliver, directly
or indirectly, any of the shares or distribute any prospectus relating to the
Common Stock to any other dealer who does not so represent and agree.
 
     The foregoing limitations do not apply to stabilization transactions or to
transactions among the U.S. Underwriters and the International Underwriters
pursuant to the Agreement Between U.S. Underwriters and International
Underwriters. As used herein, "United States" means the United States of America
(including the District of Columbia) and its territories, possessions and other
areas subject to its jurisdiction, "Canada" means Canada, its provinces,
territories, possessions and other areas subject to its jurisdiction and "U.S.
or Canadian Person" means a citizen or resident of the United States or Canada,
a corporation, partnership or other entity created or organized in or under the
laws of the United States or Canada or any political subdivision thereof, or any
estate or trust the income of which is subject to United States or Canadian
income taxation regardless of its source (other than a foreign branch of such
entity), and includes any United States or Canadian branch of a person other
than a U.S. or Canadian Person. As used herein, the term "International Person"
means any person, corporation, partnership or other entity that is not a U.S. or
Canadian Person.
 
     Pursuant to the Agreement Between U.S. Underwriters and International
Underwriters, sales may be made between the International Underwriters and the
U.S. Underwriters of such number of shares of Common Stock as may be mutually
agreed. The price of any shares so sold shall be the initial price to public,
less an amount not greater than the selling concession. To the extent that these
are sales between the U.S. Underwriters and the International Underwriters
pursuant to the Agreement Between U.S. Underwriters and International
Underwriters, the number of shares initially available for sale by the
International Underwriters or by the U.S. Underwriters may be more or less than
the amount specified on the cover page of this Prospectus.
 
     The Company and each U.S. Underwriter and International Underwriter (a)
have not offered or sold, and will not offer or sell, in the United Kingdom, by
means of any document, any shares of Common Stock
 
                                       25
<PAGE>   28
 
other than to persons whose ordinary business it is to buy or sell shares or
debentures, whether as principal or agent (except under circumstances which do
not constitute an offer to the public within the meaning of the Companies Act of
1985), (b) have complied and will comply with all applicable provisions of the
Financial Services Act of 1986 (the "1986 Act") with respect to anything done by
them in relation to the shares of Common Stock in, from or otherwise involving
the United Kingdom and (c) have only issued or passed on, and will only issue or
pass on to any person in the United Kingdom, any investment advertisement
(within the meaning of the 1986 Act) relating to the shares of Common Stock if
that person falls within Article 9(3) of the 1986 Act (Investment
Advertisements) (Exemptions) Order 1988.
 
     The shares of Common Stock may not be offered or sold directly or
indirectly in Hong Kong by means of this document or any other offering material
or document other than to persons whose ordinary business it is to buy or sell
shares or debentures, whether as principal or as agent. Unless permitted to do
so by the securities laws of Hong Kong, no person may issue or cause to be
issued in Hong Kong this document or any amendment or supplement thereto or any
other information, advertisement or document relating to the shares of Common
Stock other than with respect to shares of Common Stock intended to be disposed
of to persons outside Hong Kong or to persons whose business involves the
acquisition, disposal or holding of securities, whether as principal or as
agent.
 
     The shares of Common Stock have not been registered under the Securities
and Exchange Law of Japan and are not being offered and may not be offered or
sold directly or indirectly in Japan or to residents of Japan, except pursuant
to applicable Japanese laws and regulations.
 
     No action has been taken or will be taken in any jurisdiction by the
Company or the International Underwriters or U.S. Underwriters that would permit
a public offering of the shares offered hereby in any jurisdiction where action
for that purpose is required, other than the United States. Persons into whose
possession this Prospectus comes are required by the Company and the
International Underwriters and U.S. Underwriters to inform themselves about and
to observe any restrictions as to the offering of the shares offered hereby and
the distribution of this Prospectus.
 
     Purchasers of the shares of Common Stock offered hereby may be required to
pay stamp taxes and other charges in accordance with the laws and practices of
the country of purchase in addition to the offering price set forth on the cover
page hereof.
 
     The Company and the Selling Shareholder have agreed to indemnify the U.S.
Underwriters and the U.S. Underwriters have agreed to indemnify the Company and
the Selling Shareholder against certain liabilities, including liabilities under
the Securities Act of 1933, as amended, and to contribute to payments required
to be made in respect thereof.
 
     Each of Salomon Brothers Inc, CS First Boston Corporation, Goldman, Sachs &
Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated, and certain of their
international affiliates, from time to time provides investment banking and
other related services to the Company, the Selling Shareholder and their
respective affiliates in the ordinary course of their respective businesses.
 
                                       26
<PAGE>   29
 
                            VALIDITY OF COMMON STOCK
 
     The validity of the shares of Common Stock offered in the Offerings will be
passed upon for the Company by Newton W. Wilson, III, Esq., General Counsel of
the Company. As of the date of this Prospectus, Mr. Wilson owned approximately
6,400 shares of Common Stock of the Company (excludes shares held indirectly by
Mr. Wilson in the Company's Savings Plan for Salaried Employees) and owned
directly options to purchase 157,653 shares of Common Stock (includes options to
purchase Common Stock which are not yet vested). The validity of the Shares will
also be passed upon for the Company by Andrews & Kurth L.L.P., New York, New
York. Certain legal matters in connection with the Offerings will be passed upon
for the KKR Partnerships, as Selling Shareholder, by Latham & Watkins, Los
Angeles, California and for the Underwriters by Simpson Thacher & Bartlett (a
partnership which includes professional corporations), New York, New York.
Certain partners of Latham & Watkins, members of their families, related persons
and others have an indirect interest, through limited partnerships, in less than
1% of the Common Stock. Such persons do not have the power to vote or dispose of
such shares.
 
                                    EXPERTS
 
     The financial statements incorporated in this Prospectus by reference to
the Annual Report on Form 10-K of Union Texas Petroleum Holdings, Inc. for the
year ended December 31, 1994, have been so incorporated in reliance on the
report of Price Waterhouse LLP, independent accountants, given on the authority
of said firm as experts in auditing and accounting.
 
                                       27
<PAGE>   30
 
NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS IN CONNECTION WITH THE OFFER MADE
BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY, THE SELLING
SHAREHOLDER OR ANY OF THE UNDERWRITERS. NEITHER THE DELIVERY OF THIS PROSPECTUS
NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE
THE DATES AS OF WHICH INFORMATION IS GIVEN IN THIS PROSPECTUS. THIS PROSPECTUS
DOES NOT CONSTITUTE AN OFFER OR SOLICITATION BY ANYONE IN ANY JURISDICTION IN
WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING
SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT
IS UNLAWFUL TO MAKE SUCH SOLICITATION.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                         PAGE
                                         ----
<S>                                      <C>
Available Information..................     2
Incorporation of Certain Documents by
  Reference............................     2
Prospectus Summary.....................     3
Use of Proceeds........................     8
Selling Shareholder and Principal
  Shareholder..........................     8
Market and Dividend Information........    10
Capitalization.........................    11
Selected Consolidated Financial Data...    12
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...........................    14
Management Developments................    22
Description of Capital Stock...........    22
Underwriting...........................    24
Validity of Common Stock...............    27
Experts................................    27
</TABLE>
 
10,000,000 SHARES
 
UNION TEXAS
PETROLEUM
HOLDINGS, INC.
 
COMMON STOCK
($.05 PAR VALUE)
 
(LOGO)
 
SALOMON BROTHERS INC
 
CS FIRST BOSTON
 
GOLDMAN, SACHS & CO.
 
MERRILL LYNCH & CO.
PROSPECTUS
 
DATED MAY   , 1995
<PAGE>   31
 
Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
PROSPECTUS                 SUBJECT TO COMPLETION                         [LOGO]
                                 APRIL 21, 1995
 
10,000,000 SHARES
UNION TEXAS PETROLEUM HOLDINGS, INC.
 
COMMON STOCK
($.05 PAR VALUE)
 
The shares of Common Stock, $.05 par value per share (the "Common Stock"), of
Union Texas Petroleum Holdings, Inc. (the "Company") offered hereby (the
"Shares") are being sold by the Selling Shareholder. See "Selling Shareholder
and Principal Shareholder." The Company will not receive any of the proceeds
from the sale of the Shares offered hereby. Upon completion of the Offerings (as
defined below), the Selling Shareholder will hold approximately 27% (or 25% if
the Underwriters exercise their over-allotment options in full) of the Company's
outstanding Common Stock.
 
Of the Shares being offered, 2,000,000 shares are being offered hereby in an
international offering outside the United States and Canada (the "International
Offering") and 8,000,000 shares are being offered in a concurrent offering in
the United States and Canada (the "U.S. Offering" and collectively with the
International Offering, the "Offerings"), subject to transfers between the
International Underwriters and the U.S. Underwriters. The Price to Public and
Underwriting Discount per Share will be identical for the International Offering
and the U.S. Offering. See "Underwriting." The closing of the International
Offering and the U.S. Offering are conditioned upon each other.
 
The Common Stock is listed on The New York Stock Exchange under the symbol
"UTH." On April 20, 1995 the last reported sale price of the Common Stock on the
New York Stock Exchange Composite Transactions Tape was $23 3/8 per share. See
"Market and Dividend Information."
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------
                                                                                 PROCEEDS TO
                                       PRICE TO             UNDERWRITING         SELLING
                                       PUBLIC               DISCOUNT             SHAREHOLDER(1)
<S>                                    <C>                  <C>                  <C>
Per Share...........................   $                    $                    $
Total(2)............................   $                    $                    $
- -----------------------------------------------------------------------------------------------
</TABLE>
 
(1) Estimated expenses of $700,000 will be payable by the Company pursuant to
    its obligations under a registration agreement with the Selling Shareholder.
    See "Selling Shareholder and Principal Shareholder."
 
(2) The Selling Shareholder has granted to the International Underwriters and
    the U.S. Underwriters 30-day options to purchase up to an aggregate of
    1,500,000 shares of Common Stock at the Price to Public, less Underwriting
    Discount, solely to cover over-allotments, if any. If the Underwriters
    exercise such options in full, the total Price to Public, Underwriting
    Discount and Proceeds to Selling Shareholder will be $            ,
    $            and $            , respectively. See "Underwriting."
 
The Shares are offered subject to receipt and acceptance by the Underwriters, to
prior sale and to the Underwriters' right to reject any order in whole or in
part and to withdraw, cancel or modify the offer without notice. It is expected
that delivery of the Shares will be made at the office of Salomon Brothers
International Limited, Seven World Trade Center, New York, New York, or through
the facilities of The Depository Trust Company, on or about May   , 1995.
SALOMON BROTHERS INTERNATIONAL LIMITED
            CS FIRST BOSTON
                        GOLDMAN SACHS INTERNATIONAL
                                    MERRILL LYNCH INTERNATIONAL LIMITED
 
The date of this Prospectus is May   , 1995.
<PAGE>   32
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
           CERTAIN UNITED STATES TAX CONSEQUENCES TO NON-U.S. HOLDERS
 
     The following is a general discussion of certain United States federal
income and estate tax consequences of the ownership and disposition of shares of
Common Stock by a Non-U.S. Holder. The term "Non-U.S. Holder" means (a) a
foreign corporation, (b) a foreign partnership, (c) a nonresident alien
individual or (d) a foreign estate or trust (that is, a trust or estate not
subject to United States federal income tax on income from sources without the
United States that is not effectively connected with the conduct of a trade or
business within the United States). An individual may, subject to certain
exceptions, be deemed to be a resident alien (as opposed to a nonresident alien)
with respect to a calendar year by virtue of being present in the United States
on at least 31 days in that calendar year and for an aggregate of at least 183
days during a three-year period ending in that calendar year (counting for such
purposes all of the days present in that year, one-third of the days present in
the immediately preceding year, and one-sixth of the days present in the second
preceding year). Resident aliens are subject to United States federal tax as if
they were United States citizens.
 
     This discussion does not describe all aspects of United States federal
income and estate taxation that may be relevant to a Non-U.S. Holder's
particular circumstances or to certain types of Non-U.S. Holders that may be
subject to special treatment under United States federal income tax laws (for
example, insurance companies, tax-exempt organizations, financial institutions
or broker-dealers). Moreover, this discussion does not address non-U.S., state
and local tax consequences. Furthermore, this discussion is based on current
provisions of the Internal Revenue Code of 1986, as amended (the "Code"),
existing and proposed regulations promulgated thereunder and administrative and
judicial interpretations as of the date of this Prospectus, all of which are
subject to change. Any revisions of these authorities could be made retroactive
with respect to transactions consummated prior to the time such changes are
announced or enacted. NON-U.S. HOLDERS SHOULD CONSULT THEIR TAX ADVISORS
REGARDING THE SPECIFIC UNITED STATES AND OTHER TAX CONSEQUENCES OF THE PURCHASE,
OWNERSHIP AND DISPOSITION OF SHARES OF COMMON STOCK.
 
DIVIDENDS
 
     A dividend paid to a Non-U.S. Holder of Common Stock will be subject to
United States withholding tax at a rate of 30% of the gross amount of the
dividend (or at such lower rate as may be provided by an applicable income tax
treaty), unless the dividend is effectively connected with the conduct of a
trade or business in the United States by the Non-U.S. Holder. If a dividend is
effectively connected with a United States trade or business of a Non-U.S.
Holder (or, if a tax treaty applies, is attributable to or effectively connected
with a U.S. permanent establishment of the Non-U.S. Holder) who has properly
filed a Form 4224 (or similar statement) with the withholding agent with respect
to the taxable year in which the dividend is paid, no withholding will be
required. However, that dividend will be subject to the regular United States
federal income tax on a net income basis at applicable graduated individual or
corporate rates, which is not collected by withholding. A substantial portion of
such dividends otherwise subject to withholding may be exempt from withholding,
however, under the provisions of the Code relating to a U.S. corporation that
derives 80% or more of its gross income from a foreign active trade or business
for the prior three taxable years. Further, under certain circumstances,
corporate Non-U.S. Holders may be subject to an additional "branch profits tax"
at a 30% rate or such lower rate as may be specified by an applicable income tax
treaty.
 
     Although proposed regulations could alter this position if they become
effective, currently the Internal Revenue Service's position is that a dividend
paid to an address in a foreign country is generally presumed to be paid to a
resident of the foreign country for purposes of determining the applicability of
the United States withholding tax discussed above (either at the statutory rate
of 30% or at any lower rate established by treaty) unless the payor has
knowledge to the contrary. Under the proposed regulations, however, a Non-U.S.
Holder of Common Stock who wishes to claim the benefit of an applicable treaty
rate would be required to file Form 1001 (Ownership, Exemption of Reduced Rate
Certificate) and, subject to a de minimis exception, Form 8306 (Certificate of
Residence) (a form not yet printed by the Internal Revenue Service) with the
withholding agent. Such forms would be required
 
                                       24
<PAGE>   33
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
to contain the name and address of the Non-U.S. Holder and other pertinent
information, to be certified by the Non-U.S. Holder under penalties of perjury,
and, in the case of Form 8306, to include an official statement by the competent
authority in the foreign country that the Non-U.S. Holder is a resident thereof
for purposes of its tax laws.
 
     A Non-U.S. Holder of Common Stock eligible for a reduced rate of United
States withholding tax pursuant to an income tax treaty may obtain a refund as
to any excess amounts withheld by filing an appropriate claim for refund with
the Internal Revenue Service.
 
GAIN ON DISPOSITION
 
     In general, a Non-U.S. Holder will not be subject to the United States
federal withholding tax in respect of gain realized on a disposition of shares
of Common Stock. In addition, except as described below, regular United States
federal income tax will not apply to gain realized on the disposition of shares
of Common Stock, provided that (i) the gain is not effectively connected with
the conduct of a trade or business of the Non-U.S. Holder in the United States
(or, if any of certain tax treaties applies, is not attributable to or
effectively connected with a United States permanent establishment of the
Non-U.S. Holder within the meaning of the applicable treaty), (ii) in the case
of a Non-U.S. Holder who is an individual (a) if such individual holds the
Common Stock as a capital asset, either he, (1) is not present in the United
States for 183 or more days in the taxable year of the disposition (as
calculated under certain provisions of the Code) or (2) if so present in the
United States, such individual's "tax home" for United States federal income tax
purposes is not in the United States and the gain is not attributable to an
office or other fixed place of business maintained in the United States by such
individual, (b) such individual is not subject to tax pursuant to the Code
provisions applicable to certain expatriates and (c) such individual has not
elected to be treated as a resident of the United States for federal income tax
purposes and (iii) at the time of disposition the Company is not and has not for
the shorter of the holder's holding period and the preceding five-year period
been a "United States real property holding corporation" for federal income tax
purposes or, if the Company is or was a "United States real property holding
corporation" whose Common Stock is or was during the calendar year of
disposition regularly traded on an established securities market, the Non-U.S.
Holder has not held, directly or indirectly, at any time during the shorter of
the holder's holding period and the five-year period ending on the date of
disposition, more than 5% of the shares of Common Stock. The Company believes
that it is not and has not been nor does the Company presently expect to become
a "United States real property holding corporation."
 
     A partner in a partnership or a beneficiary of a trust or estate may be
subject to United States federal income tax on gain realized on the disposition
of shares of Common Stock by the partnership, trust or estate (even though that
entity may not be subject to tax) if (i) the partner or beneficiary is subject
to United States federal income tax because of its own status, such as a United
States resident or a foreign person engaged in a trade or business in the United
States whose gain is effectively connected with that trade or business or (ii)
the partner or beneficiary is a nonresident alien individual or foreign
corporation and the gain of the partnership, estate or trust disposing of the
shares of Common Stock is effectively connected with the conduct of a trade or
business within the United States by such partnership, estate or trust.
 
FEDERAL ESTATE TAXES
 
     Shares of Common Stock owned, or treated as owned, by an individual who is
a Non-U.S. Holder at the time of death will be subject to United States federal
estate taxes, unless an applicable estate tax treaty provides otherwise.
 
UNITED STATES INFORMATION REPORTING REQUIREMENTS AND BACKUP WITHHOLDING
 
     The Company must report annually to the Internal Revenue Service the amount
of dividends paid to, and the tax withheld with respect to, a Non-U.S. Holder.
These information reporting requirements apply even if withholding was not
required because the dividends were effectively connected with a trade or
 
                                       25
<PAGE>   34
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
business in the United States of the Non-U.S. Holder or withholding was reduced
by an applicable tax treaty. Copies of these information returns may also be
made available, under the provisions of a specific treaty or agreement, to the
tax authorities in the country in which the Non-U.S. Holder resides. United
States backup withholding tax, which generally is a withholding tax imposed at a
rate of 31% on certain payments to persons that fail to furnish the information
required under the United States information reporting requirements, will
generally not apply to dividends paid on shares of Common Stock to a Non-U.S.
Holder at an address outside the United States, under temporary Treasury
regulations, unless the payor has knowledge that the payee is a U.S. person.
 
     In general, the payment of the proceeds of the disposition of shares of
Common Stock to or through a non-U.S. office of a non-U.S. broker will not
generally be subject to information reporting or backup withholding. Information
reporting requirements will apply, but backup withholding will not apply, to
payments made outside the United States to or through a foreign office of a
broker that is a United States person, a United States controlled foreign
corporation or a foreign person 50% or more of whose gross income (over a
three-year period) is effectively connected with the conduct of a United States
trade or business unless such broker has documentary evidence in its records of
the owner's non-U.S. status, certain other conditions are met and such broker
has no actual knowledge to the contrary or unless the owner otherwise
establishes an exemption. Temporary Treasury regulations provide that the
Treasury is considering whether backup withholding will apply with respect to
such payments that are not currently subject to backup withholding under the
current regulations. Under proposed Treasury regulations not currently in
effect, backup withholding will not apply to such payments absent actual
knowledge that the payee is a U.S. person.
 
     The payment of proceeds of the disposition of shares of Common Stock by a
broker to or through a U.S. office is subject to both possible backup
withholding and information reporting requirements unless the holder certifies
his non-U.S. status under penalties of perjury, or otherwise establishes an
applicable exception.
 
REFUNDS
 
     Any amounts withheld under the backup withholding rules from a payment to a
Non-U.S. Holder will be refunded or credited against the Non-U.S. Holder's
United States federal income tax liability, if any, provided that a proper claim
for refund is made or the required information is furnished to the Internal
Revenue Service.
 
                                       26
<PAGE>   35
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
                                  UNDERWRITING
 
     Subject to the terms and conditions set forth in the International
Underwriting Agreement among the Selling Shareholder, the Company and Salomon
Brothers International Limited, CS First Boston Limited, Goldman Sachs
International and Merrill Lynch International Limited as representatives of the
several International Underwriters (the "International Representatives"), the
Selling Shareholder has agreed to sell to the entities named below (the
"International Underwriters"), and each of the International Underwriters has
severally agreed to purchase from the Selling Shareholder, the respective number
of shares of Common Stock set forth opposite its name below:
 
<TABLE>
<CAPTION>
                                                                               NUMBER OF
                            INTERNATIONAL UNDERWRITER                           SHARES
    -------------------------------------------------------------------------  ---------
    <S>                                                                        <C>
    Salomon Brothers International Limited...................................
    CS First Boston Limited..................................................
    Goldman Sachs International..............................................
    Merrill Lynch International Limited......................................
 
                                                                               ---------
           Total.............................................................  2,000,000
                                                                               =========
</TABLE>
 
     The International Underwriting Agreement provides that the several
International Underwriters will be obligated to purchase all of the shares of
Common Stock being offered in the International Offering (other than those
subject to the over-allotment option described below), if any are purchased.
 
     The International Representatives have advised the Company that they
propose to offer the Common Stock directly to the public at the public offering
price set forth on the cover page of this Prospectus and to certain dealers at
such price less a concession not in excess of $   per share. The International
Underwriters may allow, and such dealers may reallow, a concession not in excess
of $   per share on sales to certain other dealers. After the initial Offering,
the price to public and concessions to dealers may be changed.
 
     The Selling Shareholder has granted to the International Underwriters and
the underwriters of the U.S. Offering (the "U.S. Underwriters") options to
purchase up to an additional 300,000 shares and 1,200,000 shares of Common
Stock, respectively, at the initial offering price less the aggregate
underwriting discounts. Either or both options may be exercised at any time up
to 30 days after the date
 
                                       27
<PAGE>   36
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
of this Prospectus. The Company and the Selling Shareholder have entered into a
U.S. Underwriting Agreement with the U.S. Underwriters providing for the
concurrent offer and sale of 8,000,000 shares of Common Stock (in addition to
the shares covered by the over-allotment option described above) in the United
States and Canada. The price to public and aggregate underwriting discount per
share for the International Offering and U.S. Offering are identical. The
closing of the International Offering is a condition to the closing of the U.S.
Offering, and vice versa. The representatives of the U.S. Underwriters are
Salomon Brothers Inc, CS First Boston Corporation, Goldman, Sachs & Co. and
Merrill Lynch, Pierce, Fenner & Smith Incorporated.
 
     For a period of 90 days after the date of this Prospectus, the KKR
Partnerships have agreed not to offer, sell, contract to sell or otherwise
dispose of any shares of Common Stock or securities convertible into,
exercisable for or exchangeable for Common Stock or any such other capital stock
without the consent of the representatives of the International Underwriters and
the U.S. Representatives. In addition, the Company has agreed not to offer, sell
or contract to sell or otherwise dispose of any shares of Common Stock or any
securities convertible into, exercisable for or exchangeable for shares of
Common Stock, except for securities issued pursuant to the Company's stock
option or other incentive benefit plans, for 90 days after the date of this
Prospectus without the consent of the representatives of the International
Underwriters and the U.S. Representatives.
 
     The International Underwriters and the U.S. Underwriters have entered into
an Agreement Between U.S. Underwriters and International Underwriters pursuant
to which each U.S. Underwriter has agreed that, as part of the distribution of
the shares of Common Stock offered in the U.S. Offering and subject to certain
exceptions, (a) it is not purchasing any such shares for the account of an
International Person (as defined below), (b) it has not offered or sold, and
will not offer, sell, resell or deliver, directly or indirectly, any shares of
Common Stock or distribute any prospectus relating to the Common Stock to anyone
other than a U.S. or Canadian Person (as defined below) and (c) any dealer to
whom it may sell any of the shares of Common Stock will represent and agree that
it will comply with the restrictions set forth in (a) and (b) and will not
offer, sell, resell or deliver, directly or indirectly, any of the shares or
distribute any prospectus relating to the Common Stock to any other dealer who
does not so represent and agree. In addition, pursuant to the Agreement Between
U.S. Underwriters and International Underwriters, each International Underwriter
has agreed that, as part of the distribution of the shares of Common Stock
offered in the International Offering and subject to certain exceptions, (1) it
is not purchasing any such shares for the account of anyone other than an
International Person, (2) it has not offered or sold, and will not offer, sell,
resell or deliver, directly or indirectly, any shares of Common Stock or
distribute any prospectus relating to the Common Stock to anyone other than an
International Person and (3) any dealer to whom it may sell any of the shares of
Common Stock will represent and agree that it will comply with the restrictions
set forth in (1) and (2) and will not offer, sell, resell or deliver, directly
or indirectly, any of the shares or distribute any prospectus relating to the
Common Stock to any other dealer who does not so represent and agree.
 
     The foregoing limitations do not apply to stabilization transactions or to
transactions among the International Underwriters and the U.S. Underwriters
pursuant to the Agreement Between U.S. Underwriters and International
Underwriters. As used herein, "United States" means the United States of America
(including the District of Columbia) and its territories, possessions and other
areas subject to its jurisdiction, "Canada" means Canada, its provinces,
territories, possessions and other areas subject to its jurisdiction and "U.S.
or Canadian Person" means a citizen or resident of the United States or Canada,
a corporation, partnership or other entity created or organized in or under the
laws of the United States or Canada or any political subdivision thereof, or any
estate or trust the income of which is subject to United States or Canadian
income taxation regardless of its source (other than a foreign branch of such
entity), and includes any United States or Canadian branch of a person other
than a U.S. or Canadian Person. As used herein, the term "International Person"
means any person, corporation, partnership or other entity that is not a U.S. or
Canadian Person.
 
     Pursuant to the Agreement Between U.S. Underwriters and International
Underwriters, sales may be made between the International Underwriters and the
U.S. Underwriters of such number of shares of
 
                                       28
<PAGE>   37
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
Common Stock as may be mutually agreed. The price of any shares so sold shall be
the initial price to public, less an amount not greater than the selling
concession. To the extent that these are sales between the International
Underwriters and the U.S. Underwriters pursuant to the Agreement Between U.S.
Underwriters and International Underwriters, the number of shares initially
available for sale by the International Underwriters or by the U.S. Underwriters
may be more or less than the amount specified on the cover page of this
Prospectus.
 
     The Company and each International Underwriter and U.S. Underwriter (a)
have not offered or sold, and will not offer or sell, in the United Kingdom, by
means of any document, any shares of Common Stock other than to persons whose
ordinary business it is to buy or sell shares or debentures, whether as
principal or agent (except under circumstances which do not constitute an offer
to the public within the meaning of the Companies Act of 1985), (b) have
complied and will comply with all applicable provisions of the Financial
Services Act of 1986 (the "1986 Act") with respect to anything done by them in
relation to the shares of Common Stock in, from or otherwise involving the
United Kingdom and (c) have only issued or passed on, and will only issue or
pass on to any person in the United Kingdom, any investment advertisement
(within the meaning of the 1986 Act) relating to the shares of Common Stock if
that person falls within Article 9(3) of the 1986 Act (Investment
Advertisements) (Exemptions) Order 1988.
 
     The shares of Common Stock may not be offered or sold directly or
indirectly in Hong Kong by means of this document or any other offering material
or document other than to persons whose ordinary business it is to buy or sell
shares or debentures, whether as principal or as agent. Unless permitted to do
so by the securities laws of Hong Kong, no person may issue or cause to be
issued in Hong Kong this document or any amendment or supplement thereto or any
other information, advertisement or document relating to the shares of Common
Stock other than with respect to shares of Common Stock intended to be disposed
of to persons outside Hong Kong or to persons whose business involves the
acquisition, disposal or holding of securities, whether as principal or as
agent.
 
     The shares of Common Stock have not been registered under the Securities
and Exchange Law of Japan and are not being offered and may not be offered or
sold directly or indirectly in Japan or to residents of Japan, except pursuant
to applicable Japanese laws and regulations.
 
     No action has been taken or will be taken in any jurisdiction by the
Company or the International Underwriters or U.S. Underwriters that would permit
a public offering of the shares offered hereby in any jurisdiction where action
for that purpose is required, other than the United States. Persons into whose
possession this Prospectus comes are required by the Company and the
International Underwriters and U.S. Underwriters to inform themselves about and
to observe any restrictions as to the offering of the shares offered hereby and
the distribution of this Prospectus.
 
     Purchasers of the shares of Common Stock offered hereby may be required to
pay stamp taxes and other charges in accordance with the laws and practices of
the country of purchase in addition to the offering price set forth on the cover
page hereof.
 
     The Company and the Selling Shareholder have agreed to indemnify the
International Underwriters and the International Underwriters have agreed to
indemnify the Company and the Selling Shareholder against certain liabilities,
including liabilities under the Securities Act of 1933, as amended, and to
contribute payments required to be made in respect thereof.
 
     Each of Salomon Brothers Inc, CS First Boston Corporation, Goldman, Sachs &
Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated, and certain of their
international affiliates, from time to time provides investment banking and
other related services to the Company, the Selling Shareholder and their
respective affiliates in the ordinary course of their respective businesses.
 
                                       29
<PAGE>   38
 
                        [ALTERNATIVE INTERNATIONAL PAGE]
 
                            VALIDITY OF COMMON STOCK
 
     The validity of the shares of Common Stock offered in the Offerings will be
passed upon for the Company by Newton W. Wilson, III, Esq., General Counsel of
the Company. As of the date of this Prospectus, Mr. Wilson owned approximately
6,400 shares of Common Stock of the Company (excludes shares held indirectly by
Mr. Wilson in the Company's Savings Plan for Salaried Employees) and owned
directly options to purchase 157,653 shares of Common Stock (includes options to
purchase Common Stock which are not yet vested). The validity of the Shares will
also be passed upon for the Company by Andrews & Kurth L.L.P., New York, New
York. Certain legal matters in connection with the Offerings will be passed upon
for the KKR Partnerships, as Selling Shareholder, by Latham & Watkins, Los
Angeles, California and for the Underwriters by Simpson Thacher & Bartlett (a
partnership which includes professional corporations), New York, New York.
Certain partners of Latham & Watkins, members of their families, related persons
and others have an indirect interest, through limited partnerships, in less than
1% of the Common Stock. Such persons do not have the power to vote or dispose of
such shares.
 
                                    EXPERTS
 
     The financial statements incorporated in this Prospectus by reference to
the Annual Report on Form 10-K of Union Texas Petroleum Holdings, Inc. for the
year ended December 31, 1994, have been so incorporated in reliance on the
report of Price Waterhouse LLP, independent accountants, given on the authority
of said firm as experts in auditing and accounting.
 
                                       30
<PAGE>   39
 
                 [ALTERNATE PAGE FOR INTERNATIONAL PROSPECTUS]
 
NO DEALER, SALES PERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS IN CONNECTION WITH THE OFFER MADE
BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY, THE SELLING
SHAREHOLDER OR ANY OF THE UNDERWRITERS. NEITHER THE DELIVERY OF THIS PROSPECTUS
NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE
THE DATES AS OF WHICH INFORMATION IS GIVEN IN THIS PROSPECTUS. THIS PROSPECTUS
DOES NOT CONSTITUTE AN OFFER OR SOLICITATION BY ANYONE IN ANY JURISDICTION IN
WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING
SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT
IS UNLAWFUL TO MAKE SUCH SOLICITATION.
                            ------------------------
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                         PAGE
                                         ---
<S>                                      <C>
Available Information..................    2
Incorporation of Certain Documents by
  Reference............................    2
Prospectus Summary.....................    3
Use of Proceeds........................    8
Selling Shareholder and Principal
  Shareholder..........................    8
Market and Dividend Information........   10
Capitalization.........................   11
Selected Consolidated Financial Data...   12
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...........................   14
Management Developments................   22
Description of Capital Stock...........   22
Certain United States Tax Consequences
  to Non-U.S. Holders..................   24
Underwriting...........................   27
Validity of Common Stock...............   30
Experts................................   30
</TABLE>
 
10,000,000 SHARES
 
UNION TEXAS
PETROLEUM
HOLDINGS, INC.
 
COMMON STOCK
($.05 PAR VALUE)
 
(LOGO)
 
SALOMON BROTHERS
INTERNATIONAL LIMITED
 
CS FIRST BOSTON
 
GOLDMAN SACHS
INTERNATIONAL
 
MERRILL LYNCH
INTERNATIONAL LIMITED
PROSPECTUS
 
DATED MAY   , 1995
<PAGE>   40
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     An itemized statement of the estimated amount of all expenses in connection
with the distribution of the securities registered hereby, all of which will be
paid by the Company, is as follows:
 
<TABLE>
    <S>                                                                        <C>
    Registration fee.........................................................  $  91,208
    Blue Sky fees and expenses...............................................     15,000
    Printing and engraving expenses..........................................    200,000
    Legal fees and expenses..................................................    250,000
    Accounting fees and expenses.............................................     60,000
    Miscellaneous fees and expenses..........................................     83,792
                                                                               ---------
           Total.............................................................  $ 700,000
                                                                               =========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law ("DGCL"), inter alia,
empowers a Delaware corporation to indemnify any person who was or is a party or
is threatened to be made a party to any threatened, pending or completed action,
suit or proceeding (other than an action by or in the right of the corporation)
by reason of the fact that such person is or was a director, officer, employee
or agent of the corporation or is or was serving at the request of the
corporation as a director, officer, employee or agent of another corporation or
other enterprise, against expenses (including attorneys' fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by him in
connection with such action, suit or proceeding if he 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 any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. Similar indemnity is
authorized for such persons against expenses (including attorneys' fees)
actually and reasonably incurred in connection with the defense or settlement of
any such threatened, pending or completed 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 provided further that (unless a court of
competent jurisdiction otherwise provides) such person shall not have been
adjudged liable to the corporation. Any such indemnification may be made only as
authorized in each specific case upon a determination by the stockholders or
disinterested directors or by independent legal counsel in a written opinion
that indemnification is proper because the indemnitee has met the applicable
standard of conduct.
 
     Section 145 further authorizes a corporation to purchase and maintain
insurance on behalf of any person who is or was a director, officer, employee or
agent of the corporation, or is or was serving at the request of the corporation
as a director, officer, employee or agent of another corporation or enterprise,
against any liability asserted against him and incurred by him in any such
capacity, or arising out of his status as such, whether or not the corporation
would otherwise have the power to indemnify him under Section 145. The Company
maintains policies insuring its and its subsidiaries' officers and directors
against certain liabilities for actions taken in such capacities, including
liabilities under the Securities Act.
 
     Article VI of the Bylaws of the Company provides for indemnification of the
directors and officers of the Company to the full extent permitted by law, as
now in effect or later amended. In addition, the Bylaws provide for
indemnification against expenses incurred by a director or officer to be paid by
the Company at reasonable intervals in advance of the final disposition of such
action, suit or proceeding upon receipt of an undertaking by or on behalf of the
director or officer to repay such amount if it shall be ultimately determined
that he is not entitled to be indemnified by the Company. The Bylaws further
provide for a contractual cause of action on the part of directors and officers
of the Company for indemnification claims which have not been paid by the
Company.
 
                                      II-1
<PAGE>   41
 
     The Company also has provided liability insurance for each director and
officer for certain losses arising from claims or charges made against them
while acting in their capacities as directors or officers of the Company.
 
     Article VIII of the Company's Restated Certificate of Incorporation limits
under certain circumstances the liability of the Company's directors for a
breach of their fiduciary duty as directors. These provisions do not eliminate
the liability of a director (i) for a breach of the director's duty of loyalty
to the Company or its stockholders, (ii) for acts or omissions not in good faith
or which involve intentional misconduct or a knowing violation of law, (iii)
under Section 174 of the DGCL (relating to the declaration of dividends and
purchase or redemption of shares in violation of the DGCL) or (iv) for any
transaction from which the director derived an improper personal benefit.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (a) Exhibits
 
<TABLE>
<S>               <C>
        1.1       -- Form of U.S. Underwriting Agreement.
        1.2       -- Form of International Underwriting Agreement.
        3.1       -- Restated Certificate of Incorporation of Union Texas Petroleum Holdings,
                     Inc. (Filed under the identical exhibit number in Post-Effective
                     Amendment No. 1 to the Company's Registration Statement No. 33-12800 and
                     incorporated herein by reference).
        3.2       -- Bylaws of the Company, as amended (Filed as Exhibit 3.2 to the Company's
                     10-Q for quarter ending June 30, 1994 (Commission File No. 1-9019) and
                     incorporated herein by reference).
        5.1       -- Opinion of legal counsel regarding legality of securities being
                     registered.
       10.1       -- Amended and Restated Registration Rights Agreement, dated September 30,
                     1987, among the Company and Certain Holders of Certain Securities of the
                     Company (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).
       10.2       -- Consulting Agreement, dated as of November 18, 1992, between the Company
                     and the KKR Partnerships (Filed as Exhibit 10.81 to the Company's Form
                     10-K for the year ended December 31, 1992 (Commission File No. 1-9019),
                     and incorporated herein by reference).
       23.1       -- Consent of Price Waterhouse LLP.
       23.2       -- Consent of legal counsel included in Exhibit 5.1.
       24.1       -- Power of Attorney included in Part II of the Registration Statement.
</TABLE>
 
ITEM 17. UNDERTAKINGS
 
     The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Exchange
Act (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Exchange Act) that is incorporated by
reference in the Registration Statement shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
     The undersigned registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.
 
                                      II-2
<PAGE>   42
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
registrant pursuant to the provisions in Item 15 above, or otherwise, the
registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.
 
                                      II-3
<PAGE>   43
 
                                   SIGNATURES
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL OF THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED IN THE CITY OF HOUSTON, STATE OF TEXAS, ON APRIL 20, 1995.
 
                                          UNION TEXAS PETROLEUM HOLDINGS, INC.
 
                                          By:          A. CLARK JOHNSON
                                                      A. Clark Johnson
                                              Chairman of the Board and Chief
                                                      Executive Officer
 
                               POWER OF ATTORNEY
 
     We, the undersigned, directors and officers of Union Texas Petroleum
Holdings, Inc. (the "Company"), do hereby severally constitute and appoint A.
Clark Johnson, Newton W. Wilson, III and Larry D. Kalmbach and each or any of
them, our true and lawful attorneys-in-fact 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 or post-effective
amendments to this Registration Statement, 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 necessary or desirable 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-in-fact and agents, and each of them, or his substitution or
substitutes, may lawfully do or cause to be done by virtue hereof.
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.
 
<TABLE>
<CAPTION>
                  SIGNATURE                               TITLE                     DATE
- ---------------------------------------------  ----------------------------    ---------------
<S>                                            <C>                             <C>
           /s/  A. CLARK JOHNSON               Chairman of the Board and
             (A. Clark Johnson)                  Chief Executive Officer
                                                 (Principal Executive
                                                 Officer)                       April 20, 1995

           /s/  LARRY D. KALMBACH              Vice President and Chief
             (Larry D. Kalmbach)                 Financial Officer
                                                 (Principal Financial
                                                 Officer)                       April 20, 1995

        /s/  DONALD M. McMULLAN                Vice President and
            (Donald M. McMullan)                 Controller
                                                 (Principal Accounting
                                                 Officer)                       April 20, 1995

         -------------------------             Director
               (Glenn A. Cox)                                                           , 1995

             /s/  SAUL A. FOX                  Director
                (Saul A. Fox)                                                   April 20, 1995

           /s/  EDWARD A. GILHULY              Director
              (Edward A. Gilhuly)                                               April 20, 1995

         /s/  JAMES H. GREENE, JR.             Director
           (James H. Greene, Jr.)                                               April 20, 1995

          /s/  HENRY R. KRAVIS                 Director
              (Henry R. Kravis)                                                 April 20, 1995

          /s/  MICHAEL W. MICHELSON            Director
               (Michael W. Michelson)                                           April 20, 1995

         -------------------------             Director
             (Stanley P. Porter)                                                        , 1995

         /s/  GEORGE R. ROBERTS                Director
             (George R. Roberts)                                                April 20, 1995

         -------------------------             Director
             (Richard R. Shinn)                                                         , 1995

         -------------------------             Director
              (Sellers Stough)                                                          , 1995
</TABLE>
 
                                      II-4
<PAGE>   44
 
                               INDEX TO EXHIBITS
 
<TABLE>
<S>               <C>
        1.1       -- Form of U.S. Underwriting Agreement.
        1.2       -- Form of International Underwriting Agreement.
        3.1       -- Restated Certificate of Incorporation of Union Texas Petroleum Holdings,
                     Inc. (Filed under the identical exhibit number in Post-Effective
                     Amendment No. 1 to the Company's Registration Statement No. 33-12800 and
                     incorporated herein by reference).
        3.2       -- Bylaws of the Company, as amended (Filed as Exhibit 3.2 to the Company's
                     10-Q for quarter ending June 30, 1994 (Commission File No. 1-9019) and
                     incorporated herein by reference).
        5.1       -- Opinion of legal counsel regarding legality of securities being
                     registered.
       10.1       -- Amended and Restated Registration Rights Agreement, dated September 30,
                     1987, among the Company and Certain Holders of Certain Securities of the
                     Company (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).
       10.2       -- Consulting Agreement, dated as of November 18, 1992, between the Company
                     and the KKR Partnerships (Filed as Exhibit 10.81 to the Company's Form
                     10-K for the year ended December 31, 1992 (Commission File No. 1-9019),
                     and incorporated herein by reference).
       23.1       -- Consent of Price Waterhouse LLP.
       23.2       -- Consent of legal counsel included in Exhibit 5.1.
       24.1       -- Power of Attorney included in Part II of the Registration Statement.
</TABLE>

<PAGE>   1

                                                                     
                                                                     EXHIBIT 1.1




                      Union Texas Petroleum Holdings, Inc.

                                  Common Stock
                           (par value $.05 per share)

                             Underwriting Agreement
                                (U.S. Version)       

                                                               ________ __, 199_

SALOMON BROTHERS INC
CS FIRST BOSTON CORPORATION
GOLDMAN, SACHS & CO.
MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
  As representatives of the
  several Underwriters named
  in Schedule I hereto
c/o SALOMON BROTHERS INC
Seven World Trade Center
New York, New York  10048

Dear Sirs:
                 Petroleum Associates, L.P. and KKR Partners II, L.P.
(together, the "Selling Stockholders"), propose, subject to the terms and
conditions stated herein, to sell to the Underwriters named in Schedule I
hereto (the "Underwriters") an aggregate of 8,000,000 shares (the "Firm
Shares") and, at the election of the Underwriters, up to 1,200,000 additional
shares (the "Optional Shares") of Common Stock, par value $.05 per share (the
"Stock"), of Union Texas Petroleum Holdings, Inc., a Delaware corporation (the
"Company").  The Firm Shares and the Optional Shares which the Underwriters
elect to purchase pursuant to Section 2 hereof are collectively referred to
herein as the "Shares".

                 It is understood and agreed to by all parties that the Company
and the Selling Stockholders are concurrently entering into an agreement (the
"International Underwriting Agreement") providing for the sale by the Selling
Stockholders of up to a total of 2,300,000 shares of Stock (the "International
Shares"), including the over-allotment option thereunder, through arrangements
with certain underwriters outside the United States (the "International
Underwriters"), for whom Salomon Brothers International Limited, CS First
Boston Limited, Goldman Sachs International and Merrill Lynch
International Limited are acting as representatives.  Anything herein or
therein to the contrary notwithstanding, the respective closings under this
Agreement and the International Underwriting Agreement are hereby expressly
made conditional on one another.  The Underwriters hereunder and the
International Underwriters are simultaneously entering into an Agreement
between U.S. and International Underwriting Syndicates (the "Agreement between
Syndicates") which provides, among other things, for the transfer of shares of
Stock between the two syndicates.  Two forms of prospectus are to be used in
connection with the offering and sale of shares of Stock contemplated by the
foregoing, one relating to the Shares hereunder and the other relating to the
International Shares.  The latter form of prospectus will be identical
<PAGE>   2
to the former except for certain substitute pages as included in the
registration statement and amendments thereto as mentioned below.  Except as
used in Sections 2, 3, 4, 9 and 11 herein, and except as the context may
otherwise require, references hereinafter to the Shares shall include all the
shares of Stock which may be sold pursuant to either this Agreement or the
International Underwriting Agreement, and references herein to any prospectus
whether in preliminary or final form, and whether as amended or supplemented,
shall include both the U.S. and the international versions thereof.

                 1.  (a)  The Company represents and warrants to, and agrees
with, each of the Underwriters that:

                      (i)   A registration statement in respect of the Shares
         has been filed with the Securities and Exchange Commission (the
         "Commission"); such registration statement and any post-effective
         amendment thereto, each in the form heretofore delivered to you, and,
         excluding exhibits thereto but including all documents incorporated by
         reference in the prospectus contained therein, to you for each of the
         other Underwriters, have been declared effective by the Commission in
         such form; no other document with respect to such registration
         statement or document incorporated by reference therein has heretofore
         been filed with the Commission; and no stop order suspending the
         effectiveness of such registration statement has been issued and no
         proceeding for that purpose has been initiated or threatened by the
         Commission (any preliminary prospectus included in such registration
         statement or filed with the Commission pursuant to Rule 424(a) of the
         rules and regulations of the Commission under the Securities Act of
         1933, as amended (the "Act"), being hereinafter called a "Preliminary
         Prospectus"; the various parts of such registration statement,
         including all exhibits thereto and including (i) the information
         contained in the form of final prospectus filed with the Commission
         pursuant to Rule 424(b) under the Act in accordance with Section 5(a)
         hereof and deemed by virtue of Rule 430A under the Act to be part of
         the registration statement at the time it was declared effective and
         (ii) the documents incorporated by reference in the prospectus
         contained in the registration statement at the time such part of the
         registration statement became effective, each as amended at the time
         such part of the registration statement became effective, being
         hereinafter called the "Registration Statement"; the final
         prospectus, in the form first filed with the Commission pursuant to
         Rule 424(b) under the Act, being hereinafter called the "Prospectus";
         any reference herein to any Preliminary Prospectus or the Prospectus
         being deemed to refer to and include the documents incorporated by
         reference therein pursuant to Item 12 of Form S-3 under the Act, as of
         the date of such Preliminary Prospectus or Prospectus, as the case may
         be; any reference to any amendment or supplement to any Preliminary
         Prospectus or the Prospectus being deemed to refer to and include any
         documents filed after the date of such Preliminary Prospectus or
         Prospectus, as the case may be, under the Securities Exchange Act of
         1934, as amended (the "Exchange Act"), and incorporated by reference
         in such Preliminary Prospectus or Prospectus, as the case may be; and
         any reference to any amendment to the Registration Statement shall
         be deemed to refer to and include any annual report of the Company
         filed pursuant to Section 13(a) or 15(d) of the Exchange Act after the
         effective date of the Registration Statement that is incorporated by   
         reference in the Registration Statement);

                      (ii)  No order preventing or suspending the use of any
         Preliminary Prospectus has been issued by the Commission, and each
         Preliminary Prospectus, at the time of filing thereof, conformed in
         all material respects to the requirements of the Act and the published
         rules and regulations of the Commission thereunder, and did not
         contain an untrue statement of a material fact or omit to state a
         material fact required to be stated therein or necessary to make the
         statements therein, in the light of the circumstances under which they
         were made, not misleading; provided, however, that this representation
         and warranty shall not apply to any statements or omissions made in
         reliance upon and in conformity with information furnished in writing
         to the Company by an Underwriter through you expressly for use therein
         or by either Selling Stockholder expressly for use in the preparation
         of the answers therein to Item 7 of Form S-3;



                                           2

<PAGE>   3
                    (iii)   The documents incorporated by reference in the
         Prospectus, when they became effective or were filed with the
         Commission, as the case may be, conformed in all material respects to
         the requirements of the Act or the Exchange Act, as applicable, and
         the published rules and regulations of the Commission thereunder, and
         none of such documents contained an untrue statement of a material
         fact or omitted to state a material fact required to be stated therein
         or necessary to make the statements therein not misleading; and any
         further documents so filed and incorporated by reference in the
         Prospectus or any further amendment or supplement thereto, when such
         documents become effective or are filed with the Commission, as the
         case may be, will conform in all material respects to the requirements
         of the Act or the Exchange Act, as applicable, and the rules and
         regulations of the Commission thereunder and will not contain an
         untrue statement of a material fact or omit to state a material fact
         required to be stated therein or necessary to make the statements
         therein not misleading;

                      (iv)  The Registration Statement conforms, and the
         Prospectus and any further amendments or supplements to the
         Registration Statement or the Prospectus will conform, in all material
         respects to the requirements of the Act and the published rules and
         regulations of the Commission thereunder and do not and will not, as
         of the applicable effective date as to the Registration Statement and
         any amendment thereto and as of the applicable filing date as to the
         Prospectus and any amendment or supplement thereto, contain an untrue
         statement of a material fact or omit to state a material fact required
         to be stated therein or necessary to make the statements therein not
         misleading; provided, however, that this representation and warranty
         shall not apply to any statements or omissions made in reliance upon
         and in conformity with information furnished in writing to the Company
         by an Underwriter through you expressly for use therein or by either
         Selling Stockholder expressly for use in the preparation of the
         answers therein to Item 7 of Form S-3;

                      (v)   None of the Company or any of its subsidiaries or,
         to the best of the Company's knowledge, Unimar Company, a Texas
         general partnership ("Unimar"), has sustained since the date of the
         latest audited financial statements included or incorporated by
         reference in the Prospectus any loss or interference with its business
         from fire, explosion, flood or other calamity, whether or not covered
         by insurance, or from any labor dispute or court or governmental
         action, order or decree, otherwise than as set forth or contemplated
         in the Prospectus, which loss or interference is material to the
         Company and its subsidiaries taken as a whole; and, since the
         respective dates as of which information is given in the Registration
         Statement and the Prospectus, there has not been any change in the
         capital stock (other than (i) any shares of capital stock of the
         Company sold upon exercise of a subscription, option or warrant or the
         conversion of a security outstanding on the date of this Agreement,
         (ii) any shares of such capital stock, or other securities convertible
         or exercisable or exchangeable for such shares, in either case issued
         pursuant to any employee stock option or benefit plan of the Company
         existing on the date of this Agreement and (iii) stock repurchases in  
         accordance with the Company's publicly announced stock repurchase
         program) or any increase of more than $25,000,000 in the consolidated
         short-term or long-term debt of the Company or any material adverse
         change, or any development involving a prospective material adverse
         change, in or affecting the general affairs, management, financial
         position, stockholders' equity or results of operations of the Company
         and its subsidiaries taken as a whole, otherwise than as set forth or
         contemplated in the Prospectus;

                      (vi)  The Company has been duly incorporated and is
         validly existing as a corporation in good standing under the laws of
         the State of Delaware, with power and authority (corporate and other)
         to own its properties and conduct its business as described in the
         Prospectus, and has been duly qualified as a foreign corporation for
         the transaction of business and is in good standing under the laws of
         each other jurisdiction in which it owns or leases properties, or
         conducts any business, so as to require such qualification, or is
         subject to no material liability or disability by reason of the
         failure to be so qualified in any such jurisdiction; each subsidiary
         of the Company identified in Annex II hereto (collectively, the
         "Material Subsidiaries") has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of its
         jurisdiction of incorporation; Unimar has been duly formed and is
         validly existing as a partnership under the laws of the State of
         Texas;





                                       3
<PAGE>   4
         and the Company does not have any subsidiary that is a "significant
         subsidiary" (within the meaning of the published rules and regulations
         of the Commission under the Act) that is not identified in Annex II
         hereto;

                    (vii)   The Company has an authorized capitalization as set
         forth in the Prospectus, and all of the issued shares of capital stock
         of the Company have been duly and validly authorized and issued, are
         fully paid and non-assessable and conform to the description thereof
         contained in the Prospectus; and all of the issued shares of capital
         stock of each Material Subsidiary have been duly and validly
         authorized and issued and are fully paid and non-assessable, and all
         of such shares of capital stock and 50% of the equity interests in
         Unimar (except for directors' qualifying shares and shares held by
         third parties solely to satisfy local law requirements and except as
         set forth in the Prospectus) are owned directly or indirectly by the
         Company, free and clear of all liens, encumbrances, equities or
         claims;

                   (viii)   The Shares have been duly and validly authorized
         and issued, are fully paid and non-assessable and conform to the
         description of the Stock contained in the Prospectus;

                      (ix)  The compliance by the Company with all of the
         provisions of this Agreement and the International Underwriting
         Agreement and the consummation of the transactions herein and therein
         contemplated will not conflict with or result in a breach or violation
         of any of the terms or provisions of, or constitute a default under,
         any indenture, mortgage, deed of trust, loan agreement or other
         agreement or instrument to which the Company or any of its
         subsidiaries or, to the best of the Company's knowledge, Unimar is a
         party or by which the Company or any of its subsidiaries or Unimar is
         bound or to which any of the property or assets of the Company or any
         of its subsidiaries or Unimar is subject, or any statute or any order,
         rule or regulation of any court or governmental agency or body having
         jurisdiction over the Company, any of its subsidiaries or Unimar or
         any of their properties (excluding conflicts, breaches, violations and
         defaults that, individually or in the aggregate, will not have any
         material adverse effect on the general affairs, management, financial
         position, stockholders' equity, results of operations or prospects of
         the Company and its subsidiaries taken as a whole), nor will any such
         action result in any violation of the provisions of the Restated
         Certificate of Incorporation or By-laws of the Company; and no
         consent, approval, authorization, order, registration or qualification
         of or with any such court or governmental agency or body is required
         for the consummation by the Company of the transactions contemplated
         by this Agreement and the International Underwriting Agreement, except
         the registration under the Act of the Shares and such consents,
         approvals, authorizations, registrations or qualifications as may be
         required under state or foreign securities or Blue Sky laws in
         connection with the purchase and distribution of the Shares by the
         Underwriters and the International Underwriters;

                      (x)   Other than as set forth in the Prospectus, there
         are no legal or governmental proceedings pending to which the Company
         or any of its subsidiaries or, to the best of the Company's knowledge,
         Unimar is a party or of which any property of the Company or any of
         its subsidiaries or Unimar is the subject which, if determined
         adversely to the Company or any of its subsidiaries or Unimar, would
         individually or in the aggregate have a material adverse effect on the
         consolidated financial position, stockholders' equity or results of
         operations of the Company and its subsidiaries taken as a whole; and,
         to the best of the Company's knowledge, no such proceedings are
         threatened or contemplated by governmental authorities or threatened
         by others;

                      (xi)  Price Waterhouse LLP, who have certified certain
         financial statements of the Company and its subsidiaries, are
         independent public accountants as required by the Act and the rules
         and regulations of the Commission thereunder; and

                    (xii)   The Shares have been approved for listing on the
         New York Stock Exchange and the Pacific Stock Exchange;


                   (xiii)   The Company is not an "investment company" within
         the meaning of the Investment Company Act of 1940, as amended (the
         "Investment Company Act"), and the published rules and regulations of
         the Commission thereunder, and the offer and sale of the Shares will
         not subject the Company to registration under, or result in a
         violation of, the Investment Company Act; and


                     (xiv)   Neither the Company nor any of its affiliates does
         business with the government of Cuba or with any person or affiliate
         located in Cuba within the meaning of Section 517.075, Florida 
         Statutes.

                                       4
<PAGE>   5
                 (b)  Each Selling Stockholder represents and warrants to, and
agrees with, each of the Underwriters and the Company that:

                     (i)   No consent, approval, authorization, order,
         registration or qualification of or with any court or governmental
         agency or body is required for the consummation by such Selling
         Stockholder of the transactions contemplated by this Agreement and the
         International Underwriting Agreement, except the registration under
         the Act of the Shares and such consents, approvals, authorizations,
         registrations or qualifications as may be required under state or
         foreign securities or Blue Sky laws in connection with the purchase
         and distribution of the Shares by the Underwriters and the
         International Underwriters; and such Selling Stockholder has full 
         power and authority to enter into this Agreement and the International
         Underwriting Agreement and to sell, assign, transfer and deliver the
         Shares hereunder and under the International Underwriting Agreement;

                      (ii)  The sale of the Shares hereunder and under the
         International Underwriting Agreement and the compliance by such
         Selling Stockholder with all of the provisions of this Agreement and
         the International Underwriting Agreement and the consummation of the
         transactions herein and therein contemplated will not conflict with or
         result in a breach or violation of any of the terms or provisions of,
         or constitute a default under, any statute, any indenture, mortgage,
         deed of trust, loan agreement or other agreement or instrument to
         which such Selling Stockholder is a party or by which such Selling
         Stockholder is bound, or to which any of the property or assets of
         such  Selling Stockholder is subject, or any statute or any order,
         rule or regulation of any court or governmental agency having
         jurisdiction over such Selling Stockholder or its property (excluding
         conflicts, breaches, violations and defaults that, individually or in
         the aggregate, will not materially adversely affect such Selling
         Stockholder's ability to perform its obligations under this Agreement
         or the International Underwriting Agreement), nor will any such action
         result in any violation of the provisions of the partnership agreement
         or other  documents, if any, relating to such Selling Stockholder;

                    (iii)   Such Selling Stockholder has, and immediately prior
         to each Time of Delivery (as defined in Section 4 hereof) such Selling
         Stockholder will have, good and valid title to the Shares to be sold
         at such Time of Delivery hereunder and under the International
         Underwriting Agreement, free and clear of all liens, encumbrances,
         equities or claims (other than the interests of the several
         Underwriters under this Agreement and of the International
         Underwriters under the International Underwriting Agreement; and, upon
         delivery of such Shares and payment therefor pursuant hereto and
         thereto, good and valid title to such Shares, free and clear of all
         liens, encumbrances, equities or claims, will pass to the several
         Underwriters and the International Underwriters;

                      (iv)  No offering, sale contract to sell, or other 
         disposition of any Stock or any securities exchangeable or convertible
         into or exercisable for any Stock will be made within 90 days after
         the date of the Prospectus, directly or indirectly, by such Selling
         Stockholder, otherwise than hereunder or under the International
         Underwriting Agreement or with your written consent or as described in
         the Prospectus;

                      (v)   Such Selling Stockholder has not taken and will not
         take, directly or indirectly, any action which is designed to or which
         has constituted or which might reasonably be expected to cause or
         result in stabilization or manipulation of the price of any security
         of the Company to facilitate the sale or resale of the Shares; and

                      (vi)  To the extent that any statements or omissions made
         in the Registration Statement, any Preliminary Prospectus, the
         Prospectus or any amendment or supplement thereto are made in reliance
         upon and in conformity with written information furnished to the
         Company by such Selling Stockholder expressly for use therein, such
         Preliminary Prospectus and the Registration Statement did not, and the
         Prospectus and any further amendments or supplements to the
         Registration Statement and the Prospectus, when they become effective
         or are filed with the Commission, as the case may be, will not,
         contain any untrue statement of a material fact or omit





                                       5
<PAGE>   6
         to state any material fact required to be stated therein or necessary
         to make the statements therein not misleading.

                 In order to document the Underwriters' compliance with the
reporting and withholding provisions of the Tax Equity and Fiscal
Responsibility Act of 1982 with respect to the transactions herein
contemplated, each Selling Stockholder agrees to deliver to you prior to or at
the First Time of Delivery (as hereinafter defined) a properly completed and
executed United States Treasury Department Form W-9 (or other applicable form
or statement specified by Treasury Department regulations in lieu thereof).

                 2.  Subject to the terms and conditions herein set forth, (a)
each Selling Stockholder agrees, severally and not jointly, to sell to the
several Underwriters the number of Firm Shares set forth opposite such Selling
Stockholder's name in Schedule II hereto, and each of the Underwriters agrees,
severally and not jointly, to purchase from the Selling Stockholders at a
purchase price per share of $_____ the number of Firm Shares set forth opposite
the name of such Underwriter in Schedule I hereto; each Underwriter shall be
obligated to purchase from each Selling Stockholder at a purchase price per
share of $_____, that number of Firm Shares (to be adjusted by you so as to
eliminate fractional shares) determined by multiplying the aggregate number of
Firm Shares to be sold by such Selling Stockholder as set forth opposite its 
name in Schedule II hereto by a fraction, the numerator of which is the
aggregate number of Firm Shares to be purchased by such Underwriter as set
forth opposite the name of such Underwriter in Schedule I hereto and the
denominator of which is the aggregate number of Firm Shares to be purchased by
all of the Underwriters from both of the Selling Stockholders hereunder and (b)
in the event and to the extent that the Underwriters shall exercise the
election to purchase Optional Shares as provided below, each Selling
Stockholder agrees, severally and not jointly, to sell to each of the
Underwriters, and each of the Underwriters agrees, severally and not jointly,
to purchase from the Selling Stockholders, at the purchase price per share set
forth in clause (a) of this Section 2, that portion of the number of Optional
Shares as to which such election shall have been exercised (to be adjusted by
you so as to eliminate fractional shares) determined by multiplying such number
of Optional Shares by a fraction the numerator of which is the maximum number
of Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule I hereto and the denominator
of which is the maximum number of the Optional Shares which all of the  
Underwriters are entitled to purchase hereunder. 


                 The Selling Stockholders hereby grant to the Underwriters the
right to purchase at their election up to 1,200,000 Optional Shares, at the
purchase price per share set forth in the paragraph above, for the sole purpose
of covering over-allotments in the sale of the Firm Shares.  Any such election
to purchase Optional Shares may be exercised by written notice from you to the
Selling Stockholders, given within a period of 30 calendar days after the date
of this Agreement and setting forth the aggregate number of Optional Shares to
be purchased and the date on which such Optional Shares are to be delivered, as
determined by you but in no event earlier than the First Time of Delivery (as
defined in Section 4 hereof) or, unless you and the Selling Stockholders
otherwise agree in writing, earlier than two or later than ten business days
after the date of such notice.

                 3.  Upon the authorization by you of the release of the Firm
Shares, the several Underwriters propose to offer the Firm Shares for sale upon
the terms and conditions set forth in the Prospectus.

                 4.  Certificates in definitive form for the Shares to be
purchased by each Underwriter hereunder, and in such denominations and
registered in such names as Salomon Brothers Inc may request upon at least
forty-eight hours' prior notice to the Company and the Selling Stockholders,
shall be delivered by or on behalf of each Selling Stockholder to you for the
account of such Underwriter, against payment by such Underwriter or on its
behalf of the purchase price therefor by certified or official bank check or
checks, payable to the order of such Selling Stockholder, in New York Clearing
House funds, all at the office of Salomon Brothers Inc, Seven World Trade
Center, New York, New York, or through the facilities of The Depository Trust 
Company.  The time and date of such delivery and payment shall be, with respect
to the Firm Shares, 9:30 a.m., New York time, on ________ __, 199_ or such
other time and date as you, the Company and the Selling Stockholders may agree
upon in writing, and, with respect to the Optional Shares, 9:30 a.m., New York
time, on the date specified by you in the written notice given by you of the
Underwriters' election to purchase such Optional Shares, or such other time and
date as you, the Company and the Selling





                                       6
<PAGE>   7
Stockholders may agree upon in writing.  Such time and date for delivery of the
Firm Shares is herein called the "First Time of Delivery," such time and date
for delivery of the Optional Shares, if not the First Time of Delivery, is
herein called the "Second Time of Delivery", and each such time and date for
delivery is herein called a "Time of Delivery."  Such certificates will be made
available for checking and packaging at least twenty-four hours prior to each
Time of Delivery at such office of Salomon Brothers Inc.

                 5.  The Company agrees with each of the Underwriters and each
of the Selling Stockholders:

                 (a)  To prepare the Prospectus in a form approved by you and
         the Selling Stockholders and to file such Prospectus pursuant to Rule
         424(b) under the Act not later than the Commission's close of business
         on the second business day following the execution and delivery of
         this Agreement, or, if applicable, such earlier time as may be
         required by Rule 430A(a)(3) under the Act; to make no further
         amendment or any supplement to the Registration Statement or
         Prospectus which shall be reasonably disapproved by you or the Selling
         Stockholders promptly after reasonable notice thereof; to advise you
         and the Selling Stockholders, promptly after it receives notice
         thereof, of the time when the Registration Statement, or any amendment
         thereto, has been filed or becomes effective or any supplement to the
         Prospectus or any amended Prospectus has been filed and to furnish you
         and the Selling Stockholders copies thereof; to file promptly all
         reports and any definitive proxy or information statements required to
         be filed by the Company with the Commission pursuant to Section 13(a),
         13(c), 14 or 15(d) of the Exchange Act subsequent to the date of the
         Prospectus and for so long as the delivery of a prospectus is required
         in connection with the offering or sale of the Shares; to advise you
         and the Selling Stockholders, promptly after it receives notice
         thereof, of the issuance by the Commission of any stop order or of any
         order preventing or suspending the use of any Preliminary Prospectus
         or prospectus, of the suspension of the qualification of the Shares
         for offering or sale in any jurisdiction, of the initiation or
         threatening of any proceeding for any such purpose, or of any request
         by the Commission for the amending or supplementing of the
         Registration Statement or Prospectus or for additional information;
         and, in the event of the issuance of any stop order or of any order
         preventing or suspending the use of any Preliminary Prospectus or
         prospectus or suspending any such qualification, to use promptly its
         best efforts to obtain its withdrawal;

                 (b)  Promptly from time to time to take such action as you may
         reasonably request to qualify the Shares for offering and sale under
         the securities laws of such jurisdictions as you may request and to
         comply with such laws so as to permit the continuance of sales and
         dealings therein in such jurisdictions for as long as may be necessary
         to complete the distribution of the Shares, provided that in
         connection therewith the Company shall not be required to qualify as a
         foreign corporation or to file a general consent to service of process
         in any jurisdiction;

                 (c)  To furnish the Underwriters with copies of the Prospectus
         in such quantities as you may from time to time reasonably request,
         and, if the delivery of a prospectus is required at any time prior to
         the expiration of nine months after the time of issue of the
         Prospectus in connection with the offering or sale of the Shares and
         if at such time any event shall have occurred as a result of which the
         Prospectus as then amended or supplemented would include an untrue
         statement of a material fact or omit to state any material fact
         necessary in order to make the statements therein, in the light of the
         circumstances under which they were made when such Prospectus is
         delivered, not misleading, or, if for any other reason it shall be
         necessary during such same period to amend or supplement the
         Prospectus or to file under the Exchange Act any document incorporated
         by reference in the Prospectus in order to comply with the Act or the
         Exchange Act, to notify you and upon your request to file such
         document and to prepare and furnish without charge to each Underwriter
         and to any dealer in securities as many copies as you may from time to
         time reasonably request of an amended Prospectus or a supplement to
         the Prospectus which will correct such statement or omission or effect
         such compliance, and in case any Underwriter is required to deliver a
         prospectus in connection with sales of any of the Shares at any time
         nine months or more after the time of issue of the Prospectus, upon
         your request but at the expense





                                       7
<PAGE>   8
         of such Underwriter, to prepare and deliver to such Underwriter as
         many copies as you may request of an amended or supplemented
         Prospectus complying with Section 10(a)(3) of the Act;

                 (d)  To make generally available to its securityholders as
         soon as practicable, but in any event not later than eighteen months
         after the effective date of the Registration Statement (as defined in
         Rule 158(c) under the Act), an earnings statement of the Company and
         its subsidiaries (which need not be audited) complying with Section
         11(a) of the Act and the rules and regulations of the Commission
         thereunder (including at the option of the Company Rule 158);

                 (e)  During the period beginning from the date hereof and
         continuing to and including the date 90 days after the date of the
         Prospectus, not to offer, sell, contract to sell or otherwise dispose
         of (other than pursuant to employee stock option plans existing, or on
         the conversion, exchange or exercise of convertible, exchangeable or
         exercisable securities outstanding, on the date of this Agreement) any
         Stock or securities convertible or exchangeable into or exercisable
         for Stock, without your prior written consent or as described in the
         Prospectus;

                 (f)  To furnish to its stockholders as soon as practicable
         after the end of each fiscal year an annual report (including a
         balance sheet and statements of income, stockholders' equity and cash
         flows of the Company and its consolidated subsidiaries certified by
         independent public accountants) and, as soon as practicable after the
         end of each of the first three quarters of each fiscal year (beginning
         with the fiscal quarter ending after the effective date of the
         Registration Statement), consolidated summary financial information of
         the Company and its subsidiaries for such quarter in reasonable
         detail; and

                 (g)  During a period of three years from the effective date of
         the Registration Statement, to furnish to you copies of all reports or
         other communications (financial or other) furnished to stockholders,
         and deliver to you (i) as soon as they are available, copies of any
         reports and financial statements furnished to or filed with the
         Commission or any national securities exchange on which any class of
         securities of the Company is listed; and (ii) such additional
         information concerning the business and financial condition of the
         Company as you may from time to time reasonably request (such
         financial statements to be on a consolidated basis to the extent the
         accounts of the Company and its subsidiaries are consolidated in
         reports furnished to its stockholders generally or to the Commission).

                 6.  The Company covenants and agrees with the several 
Underwriters that it will pay or cause to be paid the following:  (i) the fees,
disbursements and expenses of the Company's counsel and accountants in
connection with the registration of the Shares under the Act and all other
expenses in connection with the preparation, printing and filing of the
Registration Statement, any Preliminary Prospectus and the Prospectus and
amendments and supplements thereto and the mailing and delivering of copies
thereof to the Underwriters and dealers; (ii) the cost of printing or producing
any Agreement among Underwriters, this Agreement, the International
Underwriting Agreement, the Agreement between Syndicates, any Selling
Agreements, the Blue Sky Memorandum and any other documents in connection with
the offering, purchase, sale and delivery of the Shares; (iii) all expenses in
connection with the qualification of the Shares for offering and sale under
state securities laws as provided in Section 5(b) hereof, including the fees
and disbursements of counsel for the Underwriters in connection with such
qualification and in connection with the Blue Sky survey; (iv) the filing fees
incident to securing any required review by the National Association of
Securities Dealers, Inc. of the terms of the sale of the Shares; (v) the cost
of preparing stock certificates; (vi) the cost and charges of any transfer
agent or registrar; (vii) all other costs and expenses incident to the
performance of its obligations hereunder which are not otherwise specifically
provided for in this Section; and (viii) the reasonable fees and expenses of
Latham & Watkins, counsel to the Selling Stockholders.




                                       8
<PAGE>   9

Salomon Brothers Inc agrees to advance any applicable New York State stock
transfer tax, and each Selling Stockholder agrees to reimburse Salomon Brothers
Inc for associated carrying costs in respect of the Shares sold by such Selling
Stockholder if such tax payment is not rebated on the day of payment and for
any portion of such tax payment not rebated.  It is understood, however, that,
except as provided in this Section, Section 8 and Section 11 hereof, the
Underwriters will pay all of their own costs and expenses, including the fees
of their counsel, stock transfer taxes on resale of any of the Shares by them,
and any advertising expenses connected with any offers they may make. It is
further understood that the Underwriters will not be responsible for any costs
or expenses incident to the performance of the Selling Stockholders'
obligations hereunder, including any fees or expenses of counsel for the
Selling Stockholders and, except as provided above in this Section 6, any
expenses or taxes incident to the sale and delivery of the Shares by each
Selling Stockholder to the Underwriters hereunder. The Company and the Selling
Stockholders agree that nothing contained in this Section 6 shall supersede the
terms and provisions of the Amended and Restated  Registration Rights
Agreement, dated as of September 30, 1987, by and among Union Texas Petroleum
Holdings, Inc. and Certain Holders of Certain Securities of Union Texas
Petroleum Holdings, Inc. 



                 7.  The obligations of each Selling Stockholder hereunder to
sell and deliver Shares at a Time of Delivery shall be subject, in its
discretion, to the conditions set forth in Clauses (a), (c), (e) and (i)
(with respect to, in the case of the condition set forth in clause (i) below,
the obligations of the Company thereunder) below. The obligations of the
Underwriters hereunder, as to the Shares to be delivered at each Time of
Delivery, shall be subject, in their discretion, to the condition that all
representations and warranties and other statements of the Company and of each
Selling Stockholder herein are, at and as of such Time of Delivery, true and
correct, the condition that the Company and each Selling Stockholder shall have
performed all of their respective obligations hereunder theretofore to be
performed, and the following additional conditions:


                 (a)  The Prospectus shall have been filed with the Commission
         pursuant to Rule 424(b) within the applicable time period prescribed
         for such filing by the rules and regulations under the Act and in
         accordance with Section 5(a) hereof; no stop order suspending the
         effectiveness of the Registration Statement or any part thereof shall
         have been issued and no proceeding for that purpose shall have been
         initiated or threatened by the Commission; and all requests for
         additional information on the part of the Commission shall have been
         complied with to your reasonable satisfaction;

                 (b)  Simpson Thacher & Bartlett, counsel for the Underwriters,
         shall have furnished to you such opinion or opinions, dated such Time
         of Delivery, with respect to the incorporation of the Company, the
         validity of the Shares being delivered at such Time of Delivery, the
         Registration Statement, the Prospectus, and other related matters as
         you may reasonably request, and such counsel shall have received such
         papers and information as they may reasonably request to enable them
         to pass upon such matters;

                 (c)  Andrews & Kurth L.L.P., counsel for the Company, shall
         have furnished to you their written opinion, dated such Time of
         Delivery, in form and substance satisfactory to you, to the effect
         that:

                               (i)  The Company has been duly incorporated and
                 is validly existing as a corporation in good standing under
                 the laws of the State of Delaware, with requisite corporate
                 power and authority to own its properties and conduct its
                 business as described in the Prospectus;

                              (ii)  The Company has an authorized
                 capitalization as set forth in the Prospectus, and all of the
                 issued shares of capital stock of the Company (including the
                 Shares being delivered at such Time of Delivery) have been
                 duly and validly authorized and issued and are fully paid and
                 non-assessable; and the Shares conform to the description of
                 the Stock contained in the Prospectus;

                             (iii)  The Company has been duly qualified as a
                 foreign corporation for the transaction of business and is in
                 good standing under the laws of each other jurisdiction





                                       9
<PAGE>   10
                 in which it owns or leases a material amount of properties, or
                 conducts any material business, so as to require such
                 qualification, or is subject to no material liability or
                 disability by reason of failure to be so qualified in any such
                 jurisdiction (such counsel being entitled to rely in respect
                 of the opinion in this clause upon opinions of local counsel
                 and in respect of matters of fact upon certificates of public
                 officials or officers of the Company, provided that such
                 counsel shall state that they believe that both you and they
                 are justified in relying upon such opinions and certificates);

                              (iv)  Each Material Subsidiary has been duly
                 incorporated and is validly existing as a corporation in good
                 standing under the laws of its jurisdiction of incorporation;
                 to the best of such counsel's knowledge after reasonable
                 investigation, Unimar has been duly formed and is validly
                 existing as a partnership under the laws of the State of
                 Texas; and all of the issued shares of capital stock of each
                 Material Subsidiary have been duly and validly authorized and
                 issued and are fully paid and non-assessable, and (except for
                 directors' qualifying shares and shares held by third parties
                 solely to satisfy local law requirements and except as
                 otherwise set forth in the Prospectus), to the best of such
                 counsel's knowledge after reasonable investigation and except
                 as set forth in a schedule to such counsel's opinion, all of
                 such shares of capital stock and 50% of the equity interests
                 in Unimar are owned directly or indirectly by the Company,
                 free and clear of all liens, encumbrances, equities or claims
                 within the meaning of the Uniform Commercial Code (such
                 counsel being entitled to (A) state that the opinion in this
                 clause relating to the ownership of capital stock and equity
                 interests is based solely on a review of the corporate records
                 of the Company and its subsidiaries and the records of Unimar,
                 the certificate or certificates representing such shares of
                 capital stock and evidence of such equity interests in Unimar
                 and a certificate or certificates in respect of matters of
                 fact as to ownership of and liens, encumbrances, equities or
                 claims on such shares of capital stock and equity interests,
                 provided that such counsel shall state that they believe that
                 both you and they are justified in relying upon such
                 certificate or certificates and (B) rely in respect of the
                 opinion in this clause upon opinions of local counsel
                 furnished to you at such Time of Delivery and in respect of
                 matters of fact upon certificates of public officials or
                 officers of the Company or its subsidiaries furnished to you
                 at such Time of Delivery, provided that such counsel shall
                 state that they believe that both you and they are justified
                 in relying upon such opinions and certificates);

                               (v)  To the best of such counsel's knowledge
                 after reasonable investigation, other than as set forth in the
                 Prospectus, there is no pending or threatened action, suit or
                 proceeding before any court or any governmental agency or body
                 or any arbitrator involving the Company, any Material
                 Subsidiary or Unimar required to be disclosed in the
                 Registration Statement that is not adequately disclosed
                 therein;

                              (vi)  This Agreement and the International
                 Underwriting Agreement have been duly authorized, executed and
                 delivered by the Company;

                             (vii)  The compliance by the Company with all of
                 the provisions of this Agreement and the International
                 Underwriting Agreement and the consummation of the
                 transactions herein and therein contemplated will not result
                 in any violation of the Restated Certificate of Incorporation
                 or By-laws of the Company and, to the best of such counsel's
                 knowledge after reasonable investigation, such action will not
                 result in a breach or violation of any of the terms or
                 provisions of, or constitute a default under, any indenture,
                 mortgage, deed of trust, loan agreement or other agreement or
                 instrument to which the Company or any of its Material
                 Subsidiaries or, to the best of the Company's knowledge,
                 Unimar is a party or by which the Company or any of its
                 Material Subsidiaries or, to the best of such counsel's
                 knowledge, Unimar is bound or to which any of the property or
                 assets of the Company or any of its Material Subsidiaries or,
                 to the best of such counsel's knowledge, Unimar is subject, or
                 any statute or any order, rule or regulation known to such
                 counsel





                                       10
<PAGE>   11
                 of any court or governmental agency or body having
                 jurisdiction over the Company, any of its Material
                 Subsidiaries or, to the best of such counsel's knowledge,
                 Unimar or any of their properties (excluding breaches,
                 violations and defaults that, individually or in the
                 aggregate, will not have any material adverse effect on the
                 general affairs, management, financial position, stockholders'
                 equity, results of operations or prospects of the Company and
                 its subsidiaries taken as a whole) (such counsel being
                 entitled to rely in respect of the opinion in this clause
                 relating to statutes, orders, rules or regulations upon
                 opinions of local counsel furnished to you at such Time of
                 Delivery, provided that such counsel shall state that they
                 believe that both you and they are justified in relying upon
                 such opinions);

                            (viii)  No consent, approval, authorization, order,
                 registration or qualification of or with any such court or
                 governmental agency or body having jurisdiction over the
                 Company is required for the consummation by the Company of the
                 transactions contemplated by this Agreement and the
                 International Underwriting Agreement, except the registration
                 under the Act of the Shares, and such consents, approvals,
                 authorizations, registrations or qualifications as may be
                 required under state or foreign securities or Blue Sky laws in
                 connection with the purchase and distribution of the Shares by
                 the Underwriters and the International Underwriters;

                              (ix)  The statements made in the Prospectus under
                 the captions "Description of Capital Stock" and "Certain
                 United States Tax Consequences to Non-U.S. Holders", insofar
                 as such statements constitute summaries of the legal matters
                 and documents referred to therein, fairly present the
                 information called for with respect to such legal matters and
                 documents and fairly summarize such legal matters and
                 documents;

                               (x)  The documents incorporated by reference in
                 the Prospectus or any further amendment or supplement thereto
                 made by the Company prior to such Time of Delivery (other than
                 the financial statements and related schedules and engineering
                 and statistical data therein, as to which such counsel need
                 express no opinion), when they became effective or were filed
                 with the Commission, as the case may be, complied as to form
                 in all material respects with the requirements of the Act or
                 the Exchange Act, as applicable, and the published rules and
                 regulations of the Commission thereunder; and

                              (xi)  The Registration Statement and the
                 Prospectus and any further amendments and supplements thereto
                 made by the Company prior to such Time of Delivery (other than
                 the financial statements and related schedules and engineering
                 and statistical data therein, as to which such counsel need
                 express no opinion) comply as to form in all material respects
                 with the requirements of the Act and the published rules and
                 regulations of the Commission thereunder.

                 Such counsel shall state that, although they do not assume any
         responsibility for the accuracy, completeness or fairness of the
         statements contained in any of the documents referred to in subclause
         (x) of this Clause (c) or in the Registration Statement or the
         Prospectus (except as and to the extent described in subclause (ix) of
         this Clause (c)), they have no reason to believe that (i) any of the
         documents referred to in subclause (x) of this Clause (c) when such
         documents became effective or were so filed, as the case may be,
         contained, in the case of a registration statement which became
         effective under the Act, an untrue statement of a material fact, or
         omitted to state a material fact required to be stated therein or
         necessary to make the statements therein not misleading, or, in the
         case of other documents which were filed under the Exchange Act with
         the Commission, an untrue statement of a material fact, or omitted to
         state a material fact required to be stated therein or necessary to
         make the statements therein not misleading, or, in the case of other
         documents which were filed under the Exchange Act with the Commission,
         an untrue statement of a material fact or omitted to state a material
         fact necessary in order to make the statements therein, in the light
         of the circumstances under which they were made when such documents
         were so filed, not misleading; or (ii) as of its effective date, the
         Registration Statement





                                       11
<PAGE>   12
         or any further amendment thereto made by the Company prior to such
         Time of Delivery (other than the financial statements and related
         schedules therein, as to which such counsel need express no opinion or
         belief) contained an untrue statement of a material fact or omitted to
         state a material fact required to be stated therein or necessary to
         make the statements therein not misleading or that, as of its date,
         the Prospectus or any further amendment or supplement thereto made by
         the Company prior to such Time of Delivery (other than the financial
         statements and related schedules therein, as to which such counsel
         need express no opinion or belief) contained an untrue statement of a
         material fact or omitted to state a material fact necessary to make
         the statements therein, in the light of the circumstances under which
         they were made, not misleading or that, as of such Time of Delivery,
         either the Registration Statement or the Prospectus or any further
         amendment or supplement thereto made by the Company prior to such Time
         of Delivery (other than the financial statements and related schedules
         therein, as to which such counsel need express no opinion or belief)
         contains an untrue statement of a material fact or omits to state a
         material fact necessary to make the statements therein, in the light
         of the circumstances under which they were made, not misleading; and
         they do not know of any amendment to the Registration Statement
         required to be filed or of any contracts or other documents of a
         character required to be filed as an exhibit to the Registration
         Statement or required to be incorporated by reference into the
         Prospectus or required to be described in the Registration Statement
         or the Prospectus which are not filed or incorporated by reference or
         described as required.

                 In rendering the opinions referred to in subclauses (ii)
         (other than with respect to authorized capitalization), (iii), (iv),
         (v), (vii) and (viii) of this Clause (c), such counsel may rely upon
         an opinion of Newton W. Wilson, III, Esq., General Counsel, Vice
         President-Administration and Secretary of the Company, furnished to
         you at such Time of Delivery, provided that such counsel shall state
         that they believe that both you and they are justified in relying upon
         such opinion.

                 In rendering such opinion, such counsel may (A) state that
         their opinion is limited to matters governed by the Federal laws of
         the United States, the laws of the State of New York and the State of
         Texas and the General Corporation Law of the State of Delaware and (B)
         rely (to the extent such counsel deem proper and specify in their
         opinion), as to matters involving the application of the laws of other
         jurisdictions, upon the opinions of local counsel referred to in
         subclauses (iii), (iv) and (vii) of this Clause (c).

                 (d)  Latham & Watkins, counsel for each of the Selling
         Stockholders, shall have furnished to you their written opinion, dated
         such Time of Delivery, in form and substance satisfactory to you, to
         the effect that:

                               (i)  Each Selling Stockholder has been duly
                 formed and is validly existing as a partnership under the laws
                 of the State of Delaware; this Agreement and the International
                 Underwriting Agreement have been duly executed and delivered
                 by each Selling Stockholder; and the sale of the Shares
                 hereunder and thereunder and the compliance by each Selling
                 Stockholder with all of the provisions of this Agreement and
                 the International Underwriting Agreement and the consummation
                 of the transactions herein and therein contemplated will not
                 result in any violation of the respective Partnership
                 Agreement or other constituent documents, if any, relating to
                 each Selling Stockholder nor will such action result in a
                 breach or violation of any terms or provisions of, or
                 constitute a default under, any statute, any indenture,
                 mortgage, deed of trust, loan agreement or other agreement or
                 instrument known to such counsel to which either Selling
                 Stockholder is a party or by which either Selling Stockholder
                 is bound or to which any of the property or assets of either
                 Selling Stockholder is subject, or any order, rule or
                 regulation known to such counsel of any court or governmental
                 agency or body having jurisdiction over either Selling
                 Stockholder or the property of either Selling Stockholder
                 (excluding breaches, violations and defaults that,
                 individually or in the aggregate, will not materially
                 adversely affect such Selling Stockholder's ability to perform
                 its obligations under this Agreement or the International
                 Underwriting Agreement);





                                       12
<PAGE>   13
                              (ii)  No consent, approval, authorization or
                 order of any court or governmental agency or body is required
                 for the consummation of the transactions contemplated by this
                 Agreement and the International Underwriting Agreement in
                 connection with the sale of the Shares hereunder and under the
                 International Underwriting Agreement except such as have been
                 obtained under the Act and such as may be required under state
                 or foreign securities or Blue Sky laws in connection with the
                 purchase and distribution of such Shares by the Underwriters
                 and the International Underwriters;
                             (iii)  Immediately prior to such Time of Delivery
                 each Selling Stockholder had good and valid title to the
                 Shares to be sold at such Time of Delivery by such Selling
                 Stockholder under this Agreement and the International
                 Underwriting Agreement, free and clear of all liens,
                 encumbrances, equities or claims, within the meaning of the
                 Uniform Commercial Code (such counsel being entitled to state
                 that the opinion in this clause is based solely on a review of
                 the partnership records of such Selling Stockholder, the
                 certificate or certificates representing such Shares and a
                 certificate in respect of matters of fact as to ownership of
                 and liens, encumbrances, equities or claims on the Shares,
                 provided that such counsel shall state that they believe that
                 both you and they are justified in relying upon such
                 certificate or certificates) and full right, power and
                 authority to sell, assign, transfer and deliver the Shares
                 hereunder and thereunder; and

                              (iv)  Assuming that each of the several
                 Underwriters purchasing Shares to be sold pursuant to this
                 Agreement and the International Underwriting Agreement have
                 purchased such Shares in good faith and without notice of any
                 lien, encumbrance, equity or any other adverse claim within
                 the meaning of the Uniform Commercial Code, the delivery of
                 certificates for the Shares pursuant to this Agreement and the
                 International Underwriting Agreement will pass valid and
                 marketable title to such Shares to each of the several
                 Underwriters who have purchased such Shares, free and clear of
                 all liens, encumbrances, equities or adverse claims within the
                 meaning of the Uniform Commercial Code.

                 In rendering such opinion, such counsel may state that they
         express no opinion as to the laws of any jurisdiction other than the
         Federal laws of the United States, the laws of the State of New York
         and the General Corporation Law of the State of Delaware.

                 (e)  On the effective date of the Registration Statement and
         the effective date of the most recently filed post- effective
         amendment to the Registration Statement and also at each Time of
         Delivery, Price Waterhouse shall have furnished to you a letter or
         letters, dated the respective date of delivery thereof, in form and
         substance satisfactory to you, to the effect set forth in Annex I
         hereto;

                 (f) (i) None of the Company or any of its subsidiaries or
         Unimar shall have sustained since the date of the latest audited
         financial statements included or incorporated by reference in the
         Prospectus any loss or interference with its business from fire,
         explosion, flood or other calamity, whether or not covered by
         insurance, or from any labor dispute or court or governmental action,
         order or decree, otherwise than as set forth or contemplated in the
         Prospectus, which loss or interference is material to the Company and
         its subsidiaries taken as a whole, and (ii) since the respective dates
         as of which information is given in the Prospectus there shall not
         have been any change in the capital stock (other than (i) any shares
         of capital stock of the Company sold upon the exercise of a
         subscription, option or warrant or the conversion of a security
         outstanding on the date of this Agreement, (ii) any shares of such
         capital stock, or other securities convertible or exercisable or
         exchangeable for such shares, in either case issued pursuant to any
         employee stock option or benefit plan of the Company existing on the
         date of this Agreement and (iii) stock repurchases in accordance with
         the Company's publicly announced stock repurchase program) or any
         increase of more than $25,000,000 in the consolidated short-term or
         long-term debt of the Company or any change, or any development
         involving a prospective change, in or affecting the general affairs,
         management, financial position, stockholders' equity or results of
         operations of the Company and




                                       13
<PAGE>   14
         its subsidiaries taken as a whole, otherwise than as set forth or
         contemplated in the Prospectus, the effect of which, in any such case
         described in Clause (i) or (ii), is in your judgment so material and
         adverse as to make it impracticable or inadvisable to proceed with the
         public offering or the delivery of the Shares being delivered at such
         Time of Delivery on the terms and in the manner contemplated in the
         Prospectus;

                 (g)  On or after the date hereof (i) no downgrading shall have
         occurred in the rating accorded the Company's debt securities or its
         subsidiary's preferred stock by any "nationally recognized statistical
         rating organization," as that term is defined by the Commission for
         purposes of Rule 436(g)(2) under the Act and (ii) no such organization
         shall have publicly announced that it has under surveillance or
         review, with possible negative implications, its rating of any of the
         Company's debt securities (other than Standard & Poor's Corporation's
         "negative outlook" on its rating of the Company's debt securities,
         which outlook was publicly announced prior to the date hereof) or its
         subsidiary's preferred stock;

                 (h)  On or after the date hereof there shall not have occurred
         any of the following:  (i) a suspension or material limitation in
         trading in securities generally on the New York Stock Exchange; (ii) a
         general moratorium on commercial banking activities in New York
         declared by either Federal or New York State authorities; or (iii) the
         outbreak or escalation of hostilities involving the United States or
         the declaration by the United States of a national emergency or war if
         the effect of any such event specified in this Clause (iii) in your
         judgment makes it impracticable or inadvisable to proceed with the
         public offering or the delivery of the Shares being delivered at such
         Time of Delivery on the terms and in the manner contemplated in the
         Prospectus; and

                 (i)  The Company and each Selling Stockholder shall have
         furnished or caused to be furnished to you at such Time of Delivery
         certificates of the Company (executed by appropriate officers of the
         Company) and of such Selling Stockholder, respectively, satisfactory
         to you as to the accuracy of the representations and warranties of the
         Company and such Selling Stockholder, respectively, herein at and as
         of such Time of Delivery, as to the performance by the Company and
         such Selling Stockholder of all of their respective obligations
         hereunder to be performed at or prior to such Time of Delivery, and as
         to such other matters as you may reasonably request, and the Company
         shall have furnished or caused to be furnished certificates as to the
         matters set forth in subsections (a) and (f) of this Section, and as
         to such other matters as you may reasonably request.

                 8.  (a)  The Company will indemnify and hold harmless each
Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse
each Underwriter for any legal or other expenses reasonably incurred by such
Underwriter in connection with investigating or defending any such action or
claim as such expenses are incurred; provided, however, that the Company shall
not be liable in any such case to the extent that any such loss, claim, damage
or liability arises out of or is based upon an untrue statement or alleged
untrue statement or omission or alleged omission made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished to the Company by any Underwriter through you expressly for use
therein or by either Selling Stockholder expressly for use therein; and
provided, further, that the Company shall not be liable to any Underwriter
under the indemnity agreement in this subsection (a) with respect to any
Preliminary Prospectus to the extent that any such loss, claim, damage or
liability of such Underwriter results from the fact that such Underwriter sold
Shares to a person as to whom it shall be established that there was not sent
or given, at or prior to the written confirmation of such sale, a copy of the
Prospectus (excluding documents incorporated by reference) or of the Prospectus
as then amended or supplemented (excluding documents incorporated by reference)
in any case where such delivery is required by the Act if the Company has
previously furnished copies thereof to such Underwriter and the loss, claim,
damage





                                       14
<PAGE>   15
or liability of such Underwriter results from an untrue statement or omission
of a material fact contained in the Preliminary Prospectus which was corrected
in the Prospectus (excluding documents incorporated by reference) or in the
Prospectus as then amended or supplemented (excluding documents incorporated by
reference).

                 (b)  Each Selling Stockholder (subject to the limitation on
indemnity set forth in subsection (g)) will indemnify and hold harmless each
Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statement therein not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished by such Selling Stockholder to the Company, or to an Underwriter
through you, expressly for use therein; and will reimburse each Underwriter for
any legal or other expenses reasonably incurred by such Underwriter in
connection with investigating or defending any such action or claim as such
expenses are incurred; provided that such Selling Stockholder shall not be
liable to any Underwriter under the indemnity agreement in this subsection (b)
with respect to any Preliminary Prospectus to the extent that any such loss,
claim, damage or liability of such Underwriter results from the fact that such
Underwriter sold Shares to a person as to whom it shall be established that
there was not sent or given, at or prior to the written confirmation of such
sale, a copy of the Prospectus (excluding documents incorporated by reference)
or of the Prospectus as then amended or supplemented (excluding documents
incorporated by reference) in any case where such delivery is required by the
Act if the Company has previously furnished copies thereof to such Underwriter
and the loss, claim, damage or liability of such Underwriter results from an
untrue statement or omission of a material fact contained in the Preliminary
Prospectus which was corrected in the Prospectus (excluding documents
incorporated by reference) or in the Prospectus as then amended or supplemented
(excluding documents incorporated by reference).

                 (c)  Each Underwriter will indemnify and hold harmless the
Company and each Selling Stockholder against any losses, claims, damages or
liabilities to which the Company or such Selling Stockholder may become
subject, under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon an
untrue statement or alleged untrue statement of a material fact contained in
any Preliminary Prospectus, the Registration Statement or the Prospectus, or
any amendment or supplement thereto, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, in
each case to the extent, but only to the extent, that such untrue statement or
alleged untrue statement or omission or alleged omission was made in any
Preliminary Prospectus, the Registration Statement or the Prospectus or any
such amendment or supplement in reliance upon and in conformity with written
information furnished to the Company by such Underwriter through you expressly
for use therein; and will reimburse the Company and such Selling Stockholder
for any legal or other expenses reasonably incurred by the Company or such
Selling Stockholder in connection with investigating or defending any such
action or claim as such expenses are incurred.

                 (d)  Promptly after receipt by a party entitled to
indemnification under subsection (a), (b) or (c) above (the "indemnified
party") of notice of the commencement of any action, such indemnified party
shall, if a claim in respect thereof is to be made against a party required to
provide indemnification to such indemnified party under such subsection (the
"indemnifying party"), notify the indemnifying party in writing of the
commencement thereof; but the omission so to notify the indemnifying party
shall not relieve it from any liability which it may have to any indemnified
party otherwise than under such subsection.  In case any such action shall be
brought against any indemnified party and it shall notify the indemnifying
party of the commencement thereof, the indemnifying party shall be entitled to
participate therein and, to the extent that it shall wish, jointly with any
other indemnifying party similarly notified, to assume the defense thereof,
with





                                       15
<PAGE>   16
counsel satisfactory to such indemnified party (which shall not, except with
the consent of the indemnified party, be counsel to the indemnifying party),
and, after notice from the indemnifying party to such indemnified party of its
election so to assume the defense thereof, the indemnifying party shall not be
liable to such indemnified party under such subsection for any legal expenses
of other counsel or any other expenses, in each case subsequently incurred by
such indemnified party, in connection with the defense thereof other than
reasonable costs of investigation.  In no event shall an indemnifying party be
liable for the fees and expenses of more than one counsel (in addition to any
local counsel), apart from counsel to such indemnifying party, for all
indemnified parties in connection with any one action or separate but similar
or related actions arising out of the same general allegations or
circumstances.  No indemnifying party shall be liable for any settlement of any
such action effected without its consent, provided that such consent is not
unreasonably withheld or delayed.

                 (e)  If the indemnification provided for in this Section 8 is
unavailable to or insufficient to hold harmless an indemnified party under
subsection (a), (b) or (c) above in respect of any losses, claims, damages or
liabilities (or actions in respect thereof) referred to therein, then each
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities
(or actions in respect thereof) in such proportion as is appropriate to reflect
the relative benefits received by the Company and the Selling Stockholders on
the one hand and the Underwriters on the other from the offering of the Shares.
If, however, the allocation provided by the immediately preceding sentence is
not permitted by applicable law or if the indemnified party failed to give the
notice required under subsection (d) above, then each indemnifying party shall
contribute to such amount paid or payable by such indemnified party in such
proportion as is appropriate to reflect not only such relative benefits but
also the relative fault of the Company and the Selling Stockholders on the one
hand and the Underwriters on the other in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities (or
actions in respect thereof), as well as any other relevant equitable
considerations.  The relative benefits received by the Company and the Selling
Stockholders on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering of the
Shares purchased under this Agreement (before deducting expenses) received by
the Company and the Selling Stockholders on the one hand bear to the total
underwriting discounts and commissions received by the Underwriters on the
other with respect to the Shares purchased under this Agreement, in each case
as set forth in the table on the cover page of the Prospectus.  The relative
fault shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by
the Company or either Selling Stockholder on the one hand or the Underwriters
on the other and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission.  The Company,
the Selling Stockholders and the Underwriters agree that it would not be just
and equitable if contributions pursuant to this subsection (e) were determined
by pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to above in this subsection (e).  The
amount paid or payable by an indemnified party as a result of the losses,
claims, damages or liabilities (or actions in respect thereof) referred to
above in this subsection (e) shall be deemed to include any legal or other
expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim.  Notwithstanding the
provisions of this subsection (e), no Underwriter shall be required to
contribute any amount in excess of the amount by which the total price at which
the Shares underwritten by it and distributed to the public were offered to the
public exceeds the amount of any damages which such Underwriter has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission.  No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.  The Underwriters' obligations in this subsection (e) to
contribute are several in proportion to their respective underwriting
obligations and not joint.

                 (f)  The obligations of the Company and each Selling
Stockholder under this Section 8 shall be in addition to any liability which
the Company and such Selling Stockholder may otherwise have and shall extend,
upon the same terms and conditions, to each person, if any, who controls any





                                       16
<PAGE>   17
Underwriter within the meaning of the Act; and the obligations of the
Underwriters under this Section 8 shall be in addition to any liability which
the respective Underwriters may otherwise have and shall extend, upon the same
terms and conditions, to each officer and director of the Company and to each
person, if any, who controls the Company within the meaning of the Act.

                 (g)  Notwithstanding the foregoing, in no event shall either
Selling Stockholder be required to pay an amount in indemnification and
contribution under subsections (b) and (e) above in excess of the total
proceeds received by such Selling Stockholder from the Shares sold by it
pursuant to this Agreement.


                 (h)  With respect to rights and obligations of the Company and
the Selling Stockholders vis a vis each other, nothing in this Section 8 shall
be construed to modify or supersede such rights and obligations as set forth in
the Amended and Restated Registration Rights Agreement dated as of September
30, 1987 among the Company, the predecessor to Allied Signal, Inc. and the
Selling Stockholders and the letter dated April 20, 1995 from the Selling
Stockholders to the Company.


                 9.  (a)  If any Underwriter shall default in its obligation to
purchase the Shares which it has agreed to purchase hereunder at a Time of
Delivery, you may in your discretion arrange for you or another party or other
parties to purchase such Shares on the terms contained herein.  If within
thirty-six hours after such default by any Underwriter you do not arrange for
the purchase of such Shares, then the Selling Stockholders shall be entitled to
a further period of thirty-six hours within which to procure another party or
other parties satisfactory to you to purchase such Shares on such terms.  In
the event that, within the respective prescribed periods, you notify the
Selling Stockholders that you have so arranged for the purchase of such Shares,
or the Selling Stockholders notify you that they have so arranged for the
purchase of such Shares, you or the Selling Stockholders shall have the right
to postpone such Time of Delivery for a period of not more than seven days, in
order to effect whatever changes may thereby be made necessary in the
Registration Statement or the Prospectus, or in any other documents or
arrangements, and the Company agrees to file promptly any amendments to the
Registration Statement or the Prospectus which in your opinion and the opinion
of the Company may thereby be made necessary.  The term "Underwriter" as used
in this Agreement shall include any person substituted under this Section with
like effect as if such person had originally been a party to this Agreement
with respect to such Shares.

                 (b)  If, after giving effect to any arrangements for the
purchase of the Shares of a defaulting Underwriter or Underwriters by you and
the Selling Stockholders as provided in subsection (a) above, the aggregate
number of such Shares which remains unpurchased does not exceed one-eleventh of
the aggregate number of all the Shares to be purchased at such Time of
Delivery, then the Selling Stockholders shall have the right to require each
non-defaulting Underwriter to purchase the number of Shares which such
Underwriter agreed to purchase hereunder at such Time of Delivery and, in
addition, to require each non-defaulting Underwriter to purchase its pro rata
share (based on the number of Shares which such Underwriter agreed to purchase
hereunder) of the Shares of such defaulting Underwriter or Underwriters for
which such arrangements have not been made; but nothing herein shall relieve a
defaulting Underwriter from liability for its default.

                 (c)  If, after giving effect to any arrangements for the
purchase of the Shares of a defaulting Underwriter or Underwriters by you and
the Selling Stockholders as provided in subsection (a) above, the aggregate
number of such Shares which remains unpurchased exceeds one-eleventh of the
aggregate number of all the Shares to be purchased at such Time of Delivery, or
if the Selling Stockholders shall not exercise the right described in
subsection (b) above to require non-defaulting Underwriters to purchase Shares
of a defaulting Underwriter or Underwriters, then this Agreement (or, with
respect to the Second Time of Delivery, the obligations of the Underwriters to
purchase and of the Selling Stockholders to sell the Optional Shares) shall
thereupon terminate, without liability on the part of any non-defaulting
Underwriter or the Company or the Selling Stockholders, except for the expenses
to be borne by the Company, the Selling Stockholders and the Underwriters as
provided in Section 6 hereof and the





                                       17
<PAGE>   18
indemnity and contribution agreements in Section 8 hereof; but nothing herein
shall relieve a defaulting Underwriter from liability for its default.

                 10.  The respective indemnities, agreements, representations,
warranties and other statements of the Company, each Selling Stockholder and
the several Underwriters, as set forth in this Agreement or made by or on
behalf of them, respectively, pursuant to this Agreement, shall remain in full
force and effect, regardless of any investigation (or any statement as to the
results thereof) made by or on behalf of any Underwriter or any controlling
person of any Underwriter, or the Company or the Selling Stockholders, or any
officer or director or controlling person of the Company or the Selling
Stockholders, and shall survive delivery of and payment for the Shares.

                 11.  If this Agreement shall be terminated pursuant to Section
9 hereof, neither the Company nor the Selling Stockholders shall then be under
any liability to any Underwriter except as provided in Section 6 and Section 8
hereof; but, if for any other reason any Shares are not delivered by or on
behalf of either Selling Stockholder as provided herein, such Selling
Stockholder will reimburse the Underwriters through you for all out-of-pocket
expenses approved in writing by you, including fees and disbursements of
counsel, reasonably incurred by the Underwriters in making preparations for the
purchase, sale and delivery of the Shares not so delivered, but the Company and
the Selling Stockholders shall then be under no further liability to any
Underwriter in respect of the Shares not so delivered except as provided in
Section 6 and Section 8 hereof.

                 12.  In all dealings hereunder, you shall act on behalf of
each of the Underwriters, and the parties hereto shall be entitled to act and
rely upon any statement, request, notice or agreement on behalf of any
Underwriter made or given by you.

                 All statements, requests, notices and agreements hereunder
shall be in writing, and if to the Underwriters shall be delivered or sent by
mail, telex or facsimile transmission to you as the representatives at Seven
World Trade Center, New York, N.Y.  10048, Attention:  Registration Department;
if to either Selling Stockholder shall be delivered or sent by mail, telex or
facsimile transmission to such Selling Stockholder at _____________, Attention:
______________; and if to the Company shall be delivered or sent by mail, telex
or facsimile transmission to the address of the Company set forth in the
Registration Statement, Attention: Secretary; provided, however, that any
notice to an Underwriter pursuant to Section 8(d) hereof shall be delivered or
sent by mail, telex or facsimile transmission to such Underwriter at its
address set forth in its Underwriters' Questionnaire or telex constituting such
Questionnaire, which address will be supplied to the Company or either Selling
Stockholder by you upon request.  Any such statements, requests, notices or
agreements shall take effect upon receipt thereof.

                 13.  This Agreement shall be binding upon, and inure solely to
the benefit of, the Underwriters, the Company and the Selling Stockholders and,
to the extent provided in Sections 8 and 10 hereof, the officers and directors
of the Company and each person who controls the Company, either Selling
Stockholder or any Underwriter, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement.  No purchaser of any of
the Shares from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

                 14.  No partner of either Selling Stockholder or any successor
general partner of such Selling Stockholder shall have any personal liability
for the performance of any of such Selling Stockholder's obligations hereunder,
and any liability or obligation of such Selling Stockholder arising hereunder
shall be limited to and satisfied only out of the property of such Selling
Stockholder.

                 15.  Time shall be of the essence of this Agreement.  As used
herein, the term "business day" shall mean any day when the Commission's office
in Washington, D.C. is open for business.

                 16.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.





                                       18
<PAGE>   19
                 17.  This Agreement may be executed by any one or more of the
parties hereto in any number of counterparts, each of which shall be deemed to
be an original, but all such counterparts shall together constitute one and the
same instrument.





                                       19
<PAGE>   20
                 If the foregoing is in accordance with your understanding,
please sign and return to us nine counterparts hereof, and upon the acceptance
hereof by you, on behalf of each of the Underwriters, this letter and such
acceptance hereof shall constitute a binding agreement among each of the
Underwriters, the Company and the Selling Stockholders.

                          Very truly yours,

                          UNION TEXAS PETROLEUM
                            HOLDINGS, INC.


                          By:___________________________________________________
                             ___________________________________________________
                             Name: 
                             Title:


                          PETROLEUM ASSOCIATES, L.P.


                          By:___________________________________________________
                             ___________________________________________________
                             Name: 
                             Title:

                          KKR PARTNERS II, L.P.


                          By:___________________________________________________
                             ___________________________________________________
                             Name:
                             Title:





                                       20
<PAGE>   21
Accepted as of the date hereof
at New York, New York:

SALOMON BROTHERS INC
CS FIRST BOSTON CORPORATION
GOLDMAN, SACHS & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
             INCORPORATED            



By: SALOMON BROTHERS INC


By:_____________________________________
    Name:
    Title:

For themselves and the other several 
Underwriters named in Schedule I to 
the foregoing Agreement.





                                       21
<PAGE>   22
                                   SCHEDULE I


<TABLE>
<CAPTION>
                                                                                                Number of
                                                                                             Optional Shares
                                                               Total Number                  to be Purchased
                                                              of Firm Shares                   if Maximum
          Underwriter                                         to be Purchased                Option Exercised
          -----------                                         ---------------                ----------------
<S>                                                           <C>                            <C>
Salomon Brothers Inc  . . . . . . . . . . . . . . . .
CS First Boston Corporation   . . . . . . . . . . . .
Goldman, Sachs & Co.  . . . . . . . . . . . . . . . .
Merrill Lynch, Pierce, Fenner & Smith . . . . . . . .
             Incorporated . . . . . . . . . . . . . .

           Total  . . . . . . . . . . . . . . . . . .         8,000,000                      1,200,000
                                                          =================================================

</TABLE>



<PAGE>   23



                                  SCHEDULE II



<TABLE>
<CAPTION>
                                                                                                 Number of
                                                                                                 Optional Shares
                                                                  Total Number                   to be Sold
                                                                  of Firm Shares                 if Maximum
SELLING STOCKHOLDER                                               to be Sold                     Option Exercised
- -------------------                                               --------------                 ----------------
<S>                                                               <C>                            <C>
Petroleum Associates, L.P.  . . . . . . . . . . . . .
KKR Partners II, L.P.   . . . . . . . . . . . . . . .


</TABLE>



                                       1
<PAGE>   24
                                                                         ANNEX I



               Pursuant to Section 7(e) of the Underwriting Agreement, the
accountants shall furnish letters to the Underwriters to the effect that:

            (i)  They are independent certified public accountants with respect
to the Company and its subsidiaries within the meaning of the Act and the
applicable published rules and regulations thereunder;

           (ii)  In their opinion, the financial statements and financial
statement schedules provided pursuant to Article 12 of Regulation S-X audited
by them and incorporated by reference in the Registration Statement or the
Prospectus comply as to form in all material respects with the applicable
accounting requirements of the Act or the Exchange Act, as applicable, and the
applicable related published rules and regulations thereunder with respect to
Registration Statements on Form S-3; and they have made a review in accordance
with standards established by the American Institute of Certified Public
Accountants of the consolidated interim financial statements for the periods
specified in such letter, as indicated in their reports thereon, copies of
which have been furnished to the representatives of the Underwriters (the
"Representatives");

          (iii)  On the basis of limited procedures, not constituting an audit
in accordance with generally accepted auditing standards, consisting of a
reading of the unaudited financial statements referred to below, a reading of
the latest available interim financial data of the Company and its
subsidiaries, a reading of the minute books of the Company and its subsidiaries
since the date of the latest audited financial statements included or
incorporated by reference in the Prospectus, inquiries of officials of the
Company and its subsidiaries responsible for financial and accounting matters
regarding the specified items for which representations are requested below,
nothing came to their attention as a result of the foregoing procedures that
caused them to believe that:

               (A)  the unaudited condensed consolidated statements of
      operations, consolidated balance sheets and consolidated statements of
      cash flows included in the Company's Quarterly Reports on Form 10-Q
      incorporated by reference in the Prospectus do not comply as to form in
      all material respects with the applicable accounting requirements of the
      Exchange Act as it applies to Form 10-Q and the related published rules
      and regulations thereunder or are not in conformity with generally
      accepted accounting principles, when read in conjunction with the audited
      financial statements and notes thereto incorporated by reference in the
      Registration Statement, applied on a basis substantially consistent with
      the basis for the audited consolidated statements of operations,
      consolidated balance sheets and consolidated statements of cash flows
      included in the Company's Annual Report on Form 10-K for the most recent
      fiscal year;

               (B)  at the date of the latest available interim financial data
      and at a specified date not more than five days prior to the date of such
      letter, there have been any changes in the consolidated capital stock
      (other than issuances of capital stock upon exercise of options and stock
      appreciation rights, upon earn-outs of performance shares and upon
      conversions of convertible securities, in each case which were
      outstanding on the date of the latest balance sheet included or
      incorporated by reference in the Prospectus) or any increase in the
      consolidated short-term or long-term debt of the Company and its
      subsidiaries, or any decreases in consolidated net current assets
      (working capital) or stockholders' equity or other items heretofore
      determined with the Representatives, or any increases in any items
      heretofore determined with the Representatives, in each case as compared
      with amounts shown in the latest balance sheet included or incorporated
      by reference in the Prospectus, except in each case for changes,
      increases or decreases which the Prospectus discloses have occurred or
      may occur or which are described in such letter; and

               (C)  for the period from the date of the latest financial
      statements included or incorporated by reference in the Prospectus to the
      specified date referred to in Clause (B) there were any decreases in
      consolidated net revenues or operating profit or the total or per share
      amounts of consolidated net income or other items heretofore determined
      with the Representatives, or any increases in any items heretofore
      determined with the Representatives, in each case as compared with the
      comparable period of the preceding year, except in each case for
      increases or decreases which the Prospectus discloses have occurred or
      may occur or which are described in such letter; and





<PAGE>   25
           (iv)  In addition to the audit referred to in their report(s)
included or incorporated by reference in the Prospectus and the limited
procedures, inspection of minute books, inquiries and other procedures referred
to in paragraphs (iii) and (iv) above, they have carried out certain specified
procedures, not constituting an audit in accordance with generally accepted
auditing standards, with respect to certain amounts, percentages and financial
information specified by the Representatives which are derived from the general
accounting records of the Company and its subsidiaries, which appear in the
Prospectus (excluding documents incorporated by reference) or in Part II of, or
in exhibits and schedules to, the Registration Statement specified by the
Representatives or in documents incorporated by reference in the Prospectus
specified by the Representatives, and have compared certain of such amounts,
percentages and financial information with the accounting records of the
Company and its subsidiaries and have found them to be in agreement.





                                       2
<PAGE>   26
                                                                        ANNEX II


                             MATERIAL SUBSIDIARIES


Union Texas Petroleum Energy Corporation
Union Texas International Corporation
Union Texas East Kalimantan Limited
Union Texas Pakistan, Inc.
Union Texas Petroleum Limited
Unistar, Inc.
Union Texas Britannia Limited
Union Texas Finance, Inc.




<PAGE>   1



                                                                   EXHIBIT 1.2



                      UNION TEXAS PETROLEUM HOLDINGS, INC.

                                  COMMON STOCK
                           (PAR VALUE $.05 PER SHARE)

                                ________________

                             Underwriting Agreement
                            (International Version)  

                                                              ______ __, 199_

SALOMON BROTHERS INTERNATIONAL LIMITED
CS FIRST BOSTON LIMITED
GOLDMAN SACHS INTERNATIONAL
MERRILL LYNCH INTERNATIONAL LIMITED
  As representatives of the
  several Underwriters named
  in Schedule I hereto
c/o SALOMON BROTHERS INTERNATIONAL LIMITED
Seven World Trade Center
New York, New York  10048

Dear Sirs:

                 Petroleum Associates, L.P. and KKR Partners II, L.P.
(together, the "Selling Stockholders"), propose, subject to the terms and
conditions stated herein, to sell to the Underwriters named in Schedule I
hereto (the "Underwriters") an aggregate of 2,000,000 shares (the "Firm
Shares") and, at the election of the Underwriters, up to 300,000 additional
shares (the "Optional Shares") of Common Stock, par value $.05 per share (the
"Stock"), of Union Texas Petroleum Holdings, Inc., a Delaware corporation (the
"Company"). The Firm Shares and the Optional Shares which the Underwriters
elect to purchase pursuant to Section 2 hereof are collectively referred to
herein as the "Shares".

                 It is understood and agreed to by all parties that the Company
and the Selling Stockholders are concurrently entering into an agreement, a
copy of which is attached hereto (the "U.S. Underwriting Agreement"), providing
for the sale by the Selling Stockholders of up to a total of 9,200,000 shares
of Stock (the "U.S. Shares"), including the over-allotment option thereunder,
through arrangements with certain underwriters in the United States (the "U.S.
Underwriters"), for whom Salomon Brothers Inc, CS First Boston Corporation,
Goldman, Sachs & Co. and Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner &
Smith Incorporated are acting as representatives.  Anything herein or therein
to the contrary notwithstanding, the respective closings under this Agreement
and the U.S. Underwriting Agreement are hereby expressly made conditional on
one another.  The Underwriters hereunder and the U.S. Underwriters are
simultaneously entering into an Agreement between U.S. and International
Underwriting Syndicates (the "Agreement between Syndicates") which provides,
among other things, for the transfer of shares of Stock between the two
syndicates and for consultation by the representatives hereunder with Salomon
Brothers Inc prior to exercising the rights of the Underwriters under Section 7
hereof.  Two forms of prospectus are to be used in connection with the offering
and sale of shares of Stock contemplated by the foregoing, one relating to the
Shares hereunder and the other relating to the U.S. Shares.  The latter form of
prospectus will be identical to the former except for certain substitute pages
<PAGE>   2
as included in the registration statement and amendments thereto as mentioned
below.  Except as used in Sections 2, 3, 4, 9 and 11 herein, and except as the
context may otherwise require, references hereinafter to the Shares shall
include all the shares of Stock which may be sold pursuant to either this
Agreement or the U.S. Underwriting Agreement, and references herein to any
prospectus whether in preliminary or final form, and whether as amended or
supplemented, shall include both the U.S. and the international versions
thereof.

                 In addition, this Agreement incorporates by reference certain
provisions from the U.S. Underwriting Agreement (including the related
definitions of terms, which are also used elsewhere herein) and, for purposes
of applying the same, references (whether in these precise words or their
equivalent) in the incorporated provisions to the "Underwriters" shall be to
the Underwriters hereunder, to the "Shares" shall be to the Shares hereunder as
just defined, to "this Agreement" (meaning therein the U.S. Underwriting
Agreement) shall be to this Agreement (except where this Agreement is already
referred to or as the context may otherwise require) and to the representatives
of the Underwriters or to Salomon Brothers Inc shall be to the addressees of
this Agreement and to Salomon Brothers International Limited ("SBIL"), and, in
general, all such provisions and defined terms shall be applied mutatis
mutandis as if the incorporated provisions were set forth in full herein having
regard to their context in this Agreement as opposed to the U.S. Underwriting
Agreement.
 
                 1.  The Company hereby makes to the Underwriters, and each
Selling Stockholder hereby makes to the Underwriters and the Company, the same
respective representations, warranties and agreements as are set forth in
Section 1 of the U.S. Underwriting Agreement, which Section is incorporated
herein by this reference.

                 2.  Subject to the terms and conditions herein set forth, (a)
each Selling Stockholder agrees, severally and jointly, to sell to the several
Underwriters the number of Firm Shares set forth opposite such Selling
Stockholder's name in Schedule II hereto, and each of the Underwriters agrees,
severally and not jointly, to purchase from the Selling Stockholders at a
purchase price per share of $_____ the number of Firm Shares set forth opposite
the name of such Underwriter in Schedule I hereto; each Underwriter shall be
obligated to purchase from each Selling Stockholder at a purchase price per
share of $_____, that number of Firm Shares (to be adjusted by you so as to
eliminate fractional shares) determined by multiplying the aggregate number of
Firm Shares to be sold by such Selling Stockholder as set forth opposite its 
name in Schedule II hereto by a fraction, the numerator of which is the
aggregate number of Firm Shares to be purchased by such Underwriter as set
forth opposite the name of such Underwriter in Schedule I hereto and the
denominator of which is the aggregate number of Firm Shares to be purchased by
all of the Underwriters from both of the Selling Stockholders hereunder and (b)
in the event and to the extent that the Underwriters shall exercise the
election to purchase Optional Shares as provided below, each Selling
Stockholder agrees, severally and not jointly, to sell to each of the
Underwriters, and each of the Underwriters agrees, severally and not jointly,
to purchase from the Selling Stockholders, at the purchase price per share set
forth in clause (a) of this Section 2, that portion of the number of Optional
Shares as to which such election shall have been exercised (to be adjusted by
you so as to eliminate fractional shares) determined by multiplying such number
of Optional Shares by a fraction the numerator of which is the maximum number
of Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule I hereto and the denominator
of which is the maximum number of the Optional Shares which all of the 
Underwriters are entitled to purchase hereunder.


                 The Selling Stockholders hereby grant to the Underwriters the
right to purchase at their election up to 300,000 Optional Shares, at the
purchase price per share set forth in the paragraph above, for the sole purpose
of covering over-allotments in the sale of the Firm Shares.  Any such election
to purchase Optional Shares may be exercised by written notice from you to the
Selling Stockholders, given within a period of 30 calendar days after the date
of this Agreement and setting forth the aggregate number of Optional Shares to
be purchased and the date on which such Optional Shares are to be delivered, as
determined by you but in no event earlier than the First Time of Delivery (as
defined in Section 4 hereof) or, unless you and the Selling Stockholders
otherwise agree in writing, earlier than two or later than ten business days
after the date of such notice.



                                      2

<PAGE>   3
                 3.  Upon the authorization by you of the release of the Firm
Shares, the several Underwriters propose to offer the Firm Shares for sale upon
the terms and conditions set forth in the Prospectus.

                 4.  Certificates in definitive form for the Shares to be
purchased by each Underwriter hereunder, and in such denominations and
registered in such names as Salomon Brothers International Limited may request
upon at least forty-eight hours' prior notice to the Company and the Selling
Stockholders, shall be delivered by or on behalf of each Selling Stockholder to
you for the account of such Underwriter, against payment by such Underwriter or
on its behalf of the purchase price therefor by certified or official bank
check or checks, payable to the order of such Selling Stockholder, in New York
Clearing House funds, all at the office of Salomon Brothers Inc, Seven World
Trade Center, New York, New York, or through the facilities of The Depository
Trust Company.  The time and date of such delivery and payment shall be, with
respect to the Firm Shares, 9:30 a.m., New York time, on _______ __, 199_ or at
such other time and date as you, the Company and the Selling Stockholders may
agree upon in writing, and, with respect to the Optional Shares, 9:30 a.m., New
York time, on the date specified by you in the written notice given by you of
the Underwriters' election to purchase such Optional Shares, or at such other
time and date as you, the Company and the Selling Stockholders may agree upon
in writing.  Such time and date for delivery of the Firm Shares is herein
called the "First Time of Delivery", such time and date for delivery of the
Optional Shares, if not the First Time of Delivery, is herein called the
"Second Time of Delivery", and each such time and date for delivery is herein
called a "Time of Delivery."  Such certificates will be made available for
checking and packaging at least twenty-four hours prior to each Time of
Delivery at such office of Salomon Brothers Inc.

                 5.  The Company hereby makes with the Underwriters and each of
the Selling Stockholders the same agreements as are set forth in Section 5 of
the U.S. Underwriting Agreement, which Section is incorporated herein by this
reference.

                 6.  The Company, each Selling Stockholder and the Underwriters
hereby agree with respect to certain expenses on the same terms as are set
forth in Section 6 of the U.S. Underwriting Agreement, which Section is
incorporated herein by this reference.

                 7.  Subject to the provisions of the Agreement between
Syndicates, the obligations of the Underwriters hereunder shall be subject, in
their discretion, at each Time of Delivery to the condition that all
representations and warranties and other statements of the Company and of each
Selling Stockholder herein are, at and as of such Time of Delivery, true and
correct, the condition that the Company and each Selling Stockholder shall have
performed all of their respective obligations hereunder theretofore to be
performed, and additional conditions identical to those set forth in Section 7
of the U.S. Underwriting Agreement, which Section is incorporated herein by
this reference.  The obligations of each Selling Stockholder hereunder shall be
subject, in its discretion, at each Time of Delivery, to conditions identical
to those applicable to it set forth in Section 7 of the U.S. Underwriting
Agreement.

                 8.  (a)  The Company will indemnify and hold harmless each
Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse
each Underwriter for any legal or other expenses reasonably incurred by such
Underwriter in connection with investigating or defending any such action or
claim as such expenses are incurred; provided, however, that the Company shall
not be liable in any such case to the extent that any such loss, claim, damage
or liability arises out of or is based upon an untrue statement or alleged
untrue statement or omission or alleged omission made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished to the Company by any Underwriter through SBIL expressly for use
therein or by either Selling Stockholder expressly for use therein; and
provided, further, that the Company shall not





                                       3
<PAGE>   4
be liable to any Underwriter under the indemnity agreement in this subsection
(a) with respect to any Preliminary Prospectus to the extent that any such
loss, claim, damage or liability of such Underwriter results from the fact that
such Underwriter sold Shares to a person as to whom it shall be established
that there was not sent or given, at or prior to the written confirmation of
such sale, a copy of the Prospectus (excluding documents incorporated by
reference) or of the Prospectus as then amended or supplemented (excluding
documents incorporated by reference) in any case where such delivery is
required by the Act if the Company has previously furnished copies thereof to
such Underwriter and the loss, claim, damage or liability of such Underwriter
results from an untrue statement or omission of a material fact contained in
the Preliminary Prospectus which was corrected in the Prospectus (excluding
documents incorporated by reference) or in the Prospectus as then amended or
supplemented (excluding documents incorporated by reference).

                 (b)  Each Selling Stockholder (subject to the limitation on
indemnity set forth in subsection (g)) will indemnify and hold harmless each
Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statement therein not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished by such Selling Stockholder to the Company, or to an Underwriter
through you, expressly for use therein; and will reimburse each Underwriter for
any legal or other expenses reasonably incurred by such Underwriter in
connection with investigating or defending any such action or claim as such
expenses are incurred; provided that such Selling Stockholder shall not be
liable to any Underwriter under the indemnity agreement in this subsection (b)
with respect to any Preliminary Prospectus to the extent that any such loss,
claim, damage or liability of such Underwriter results from the fact that such
Underwriter sold Shares to a person as to whom it shall be established that
there was not sent or given, at or prior to the written confirmation of such
sale, a copy of the Prospectus (excluding documents incorporated by reference)
or of the Prospectus as then amended or supplemented (excluding documents
incorporated by reference) in any case where such delivery is required by the
Act if the Company has previously furnished copies thereof to such Underwriter
and the loss, claim, damage or liability of such Underwriter results from an
untrue statement or omission of a material fact contained in the Preliminary
Prospectus which was corrected in the Prospectus (excluding documents
incorporated by reference) or in the Prospectus as then amended or supplemented
(excluding documents incorporated by reference).

                 (c)  Each Underwriter will indemnify and hold harmless the
Company and each Selling Stockholder against any losses, claims, damages or
liabilities to which the Company or such Selling Stockholder may become
subject, under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon an
untrue statement or alleged untrue statement of a material fact contained in
any Preliminary Prospectus, the Registration Statement or the Prospectus, or
any amendment or supplement thereto, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, in
each case to the extent, but only to the extent, that such untrue statement or
alleged untrue statement or omission or alleged omission was made in any
Preliminary Prospectus, the Registration Statement or the Prospectus or any
such amendment or supplement in reliance upon and in conformity with written
information furnished to the Company by such Underwriter through SBIL expressly
for use therein; and will reimburse the Company and such Selling Stockholder
for any legal or other expenses reasonably incurred by the Company or such
Selling Stockholder in connection with investigating or defending any such
action or claim as such expenses are incurred.

                 (d)  Promptly after receipt by a party entitled to
indemnification under subsection (a), (b) or (c) above (the "indemnified
party") of notice of the commencement of any action, such indemnified party





                                       4
<PAGE>   5
shall, if a claim in respect thereof is to be made against a party required to
provide indemnification to such indemnified party under such subsection (the
"indemnifying party"), notify the indemnifying party in writing of the
commencement thereof; but the omission so to notify the indemnifying party
shall not relieve it from any liability which it may have to any indemnified
party otherwise than under such subsection.  In case any such action shall be
brought against any indemnified party and it shall notify the indemnifying
party of the commencement thereof, the indemnifying party shall be entitled to
participate therein and, to the extent that it shall wish, jointly with any
other indemnifying party similarly notified, to assume the defense thereof,
with counsel satisfactory to such indemnified party (which shall not, except
with the consent of the indemnified party, be counsel to the indemnifying
party), and, after notice from the indemnifying party to such indemnified party
of its election so to assume the defense thereof, the indemnifying party shall
not be liable to such indemnified party under such subsection for any legal
expenses of other counsel or any other expenses, in each case subsequently
incurred by such indemnified party, in connection with the defense thereof
other than reasonable costs of investigation.  In no event shall an
indemnifying party be liable for the fees and expenses of more than one counsel
(in addition to any local counsel), apart from counsel to such indemnifying
party, for all indemnified parties in connection with any one action or
separate but similar or related actions arising out of the same general
allegations or circumstances.  No indemnifying party shall be liable for any
settlement of any such action effected without its consent, provided that such
consent is not unreasonably withheld or delayed.

                 (e)  If the indemnification provided for in this Section 8 is
unavailable to or insufficient to hold harmless an indemnified party under
subsection (a), (b) or (c) above in respect of any losses, claims, damages or
liabilities (or actions in respect thereof) referred to therein, then each
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities
(or actions in respect thereof) in such proportion as is appropriate to reflect
the relative benefits received by the Company and the Selling Stockholders on
the one hand and the Underwriters on the other from the offering of the Shares.
If, however, the allocation provided by the immediately preceding sentence is
not permitted by applicable law or if the indemnified party failed to give the
notice required under subsection (d) above, then each indemnifying party shall
contribute to such amount paid or payable by such indemnified party in such
proportion as is appropriate to reflect not only such relative benefits but
also the relative fault of the Company and the Selling Stockholders on the one
hand and the Underwriters on the other in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities (or
actions in respect thereof), as well as any other relevant equitable
considerations.  The relative benefits received by the Company and the Selling
Stockholders on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering of the
Shares purchased under this Agreement (before deducting expenses) received by
the Company and the Selling Stockholders on the one hand bear to the total
underwriting discounts and commissions received by the Underwriters on the
other with respect to the Shares purchased under this Agreement, in each case
as set forth in the table on the cover page of the Prospectus.  The relative
fault shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by
the Company or either Selling Stockholder on the one hand or the Underwriters
on the other and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission.  The Company,
the Selling Stockholders and the Underwriters agree that it would not be just
and equitable if contributions pursuant to this subsection (e) were determined
by pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to above in this subsection (e).  The
amount paid or payable by an indemnified party as a result of the losses,
claims, damages or liabilities (or actions in respect thereof) referred to
above in this subsection (e) shall be deemed to include any legal or other
expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim.  Notwithstanding the
provisions of this subsection (e), no Underwriter shall be required to
contribute any amount in excess of the amount by which the total price at which
the Shares underwritten by it and distributed to the public were offered to the
public exceeds the amount of any damages which such Underwriter has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission.  No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Act) shall be





                                       5
<PAGE>   6
entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation.  The Underwriters' obligations in this subsection (e) to
contribute are several in proportion to their respective underwriting
obligations and not joint.

                 (f)  The obligations of the Company and each Selling
Stockholder under this Section 8 shall be in addition to any liability which
the Company and such Selling Stockholder may otherwise have and shall extend,
upon the same terms and conditions, to each person, if any, who controls any
Underwriter within the meaning of the Act; and the obligations of the
Underwriters under this Section 8 shall be in addition to any liability which
the respective Underwriters may otherwise have and shall extend, upon the same
terms and conditions, to each officer and director of the Company and to each
person, if any, who controls the Company within the meaning of the Act.

                 (g)  Notwithstanding the foregoing, in no event shall either
Selling Stockholder be required to pay an amount in indemnification and
contribution under subsections (b) and (e) above in excess of the total
proceeds received by such Selling Stockholder from the Shares sold by it
pursuant to this Agreement.

                 (h)  With respect to rights and obligations of the Company and
the Selling Stockholders vis a vis each other, nothing in this Section 8 shall
be construed to modify or supersede such rights and obligations as set forth in
the Amended and Restated Registration Rights Agreement dated as of September
30, 1987 among the Company, the predecessor to Allied Signal, Inc. and the
Selling Stockholders and the letter dated April 20, 1995 from the Selling
Stockholders to the Company (and Allied Signal, Inc.).

                 9.  (a)  If any Underwriter shall default in its obligation to
purchase the Shares which it has agreed to purchase hereunder at a Time of
Delivery, you may in your discretion arrange for you or another party or other
parties to purchase such Shares on the terms contained herein.  If within
thirty-six hours after such default by any Underwriter you do not arrange for
the purchase of such Shares, then the Selling Stockholders shall be entitled to
a further period of thirty-six hours within which to procure another party or
other parties satisfactory to you to purchase such Shares on such terms.  In
the event that, within the respective prescribed periods, you notify the
Selling Stockholders that you have so arranged for the purchase of such Shares,
or the Selling Stockholders notify you that they have so arranged for the
purchase of such Shares, you or the Selling Stockholders shall have the right
to postpone such Time of Delivery for a period of not more than seven days, in
order to effect whatever changes may thereby be made necessary in the
Registration Statement or the Prospectus, or in any other documents or
arrangements, and the Company agrees to file promptly any amendments to the
Registration Statement or the Prospectus which in your opinion and the opinion
of the Company may thereby be made necessary.  The term "Underwriter" as used
in this Agreement shall include any person substituted under this Section with
like effect as if such person had originally been a party to this Agreement
with respect to such Shares.

                 (b)  If, after giving effect to any arrangements for the
purchase of the Shares of a defaulting Underwriter or Underwriters by you and
the Selling Stockholders as provided in subsection (a) above, the aggregate
number of such Shares which remains unpurchased does not exceed one-eleventh of
the aggregate number of all the Shares to be purchased at such Time of
Delivery, then the Selling Stockholders shall have the right to require each
non-defaulting Underwriter to purchase the number of Shares which such
Underwriter agreed to purchase hereunder at such Time of Delivery and, in
addition, to require each non-defaulting Underwriter to purchase its pro rata
share (based on the number of Shares which such Underwriter agreed to purchase
hereunder) of the Shares of such defaulting Underwriter or Underwriters for
which such arrangements have not been made; but nothing herein shall relieve a
defaulting Underwriter from liability for its default.

                 (c)  If, after giving effect to any arrangements for the
purchase of the Shares of a defaulting Underwriter or Underwriters by you and
the Selling Stockholders as provided in subsection (a) above, the aggregate
number of such Shares which remains unpurchased exceeds one-eleventh of the
aggregate number of all the Shares to be purchased at such Time of Delivery, or
if the Selling Stockholders shall





                                       6
<PAGE>   7
not exercise the right described in subsection (b) above to require
non-defaulting Underwriters to purchase Shares of a defaulting Underwriter or
Underwriters, then this Agreement (or, with respect to the Second Time of
Delivery, the obligations of the Underwriters to purchase and of the Selling
Stockholders to sell the Optional Shares) shall thereupon terminate, without
liability on the part of any non-defaulting Underwriter or the Company or the
Selling Stockholders, except for the expenses to be borne by the Company, the
Selling Stockholders and the Underwriters as provided in Section 6 hereof and
the indemnity and contribution agreements in Section 8 hereof; but nothing
herein shall relieve a defaulting Underwriter from liability for its default.

                 10.  The respective indemnities, agreements, representations,
warranties and other statements of the Company, each Selling Stockholder and
the several Underwriters, as set forth in this Agreement or made by or on
behalf of them, respectively, pursuant to this Agreement, shall remain in full
force and effect, regardless of any investigation (or any statement as to the
results thereof) made by or on behalf of any Underwriter or any controlling
person of any Underwriter, or the Company or the Selling Stockholders, or any
officer or director or controlling person of the Company or the Selling
Stockholders, and shall survive delivery of and payment for the Shares.

                 11.  If this Agreement shall be terminated pursuant to Section
9 hereof, neither the Company nor the Selling Stockholders shall then be under
any liability to any Underwriter except as provided in Section 6 and Section 8
hereof; but, if for any other reason any Shares are not delivered by or on
behalf of either Selling Stockholder as provided herein, such Selling
Stockholder will reimburse the Underwriters through SBIL for all out-of-pocket
expenses approved in writing by SBIL, including fees and disbursements of
counsel, reasonably incurred by the Underwriters in making preparations for the
purchase, sale and delivery of the Shares not so delivered, but the Company and
the Selling Stockholders shall then be under no further liability to any
Underwriter in respect of the Shares not so delivered except as provided in
Section 6 and Section 8 hereof.

                 12.  In all dealings hereunder, you shall act on behalf of
each of the Underwriters, and the parties hereto shall be entitled to act and
rely upon any statement, request, notice or agreement on behalf of any
Underwriter made or given by you.

                 All statements, requests, notices and agreements hereunder
shall be in writing, and if to the Underwriters shall be delivered or sent by
mail, telex or facsimile transmission to the Underwriters in care of SBIL,
Seven World Trade Center, New York, New York 10048, Attention: ______, Telex
No. ______, facsimile transmission no. ______; if to either Selling Stockholder
shall be delivered or sent by mail, telex or facsimile transmission to such
Selling Stockholder at ______________, Attention: _________; and if to the
Company shall be delivered or sent by mail, telex or facsimile transmission to
the address of the Company set forth in the Registration Statement, Attention:
Secretary; provided, however, that any notice to an Underwriter pursuant to
Section 8(d) hereof shall be delivered or sent by mail, telex or facsimile
transmission to such Underwriter at its address set forth in its Underwriters'
Questionnaire, or telex constituting such Questionnaire, which address will be
supplied to the Company or either Selling Stockholder by SBIL upon request.
Any such statements, requests, notices or agreements shall take effect upon
receipt thereof.

                 13.  This Agreement shall be binding upon, and inure solely to
the benefit of, the Underwriters, the Company and the Selling Stockholders and,
to the extent provided in Sections 8 and 10 hereof, the officers and directors
of the Company and the Selling Stockholder and each person who controls the
Company, either Selling Stockholder or any Underwriter, and their respective
heirs, executors, administrators, successors and assigns, and no other person
shall acquire or have any right under or by virtue of this Agreement.  No
purchaser of any of the Shares from any Underwriter shall be deemed a successor
or assign by reason merely of such purchase.

                 14. No partner of either Selling Stockholder or any successor
general partner or such Selling Stockholder shall have any personal liability
for the performance of any of such Selling Stockholder's obligations hereunder,
and any liability or obligation of such Selling Stockholder arising hereunder
shall be limited to and satisfied only out of the property of such Selling
Stockholder.

                 15.  Time shall be of the essence of this Agreement.





                                       7
<PAGE>   8
                 16.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, UNITED STATES OF AMERICA.

                 17.  This Agreement may be executed by any one or more of the
parties hereto in any number of counterparts, each of which shall be deemed to
be an original, but all such counterparts shall together constitute one and the
same instrument.





                                       8
<PAGE>   9
                 If the foregoing is in accordance with your understanding,
please sign and return to us nine counterparts hereof, and upon the acceptance
hereof by you, on behalf of each of the Underwriters, this letter and such
acceptance hereof shall constitute a binding agreement among each of the
Underwriters, the Company and the Selling Stockholders.

                                  Very truly yours,

                                  UNION TEXAS PETROLEUM
                                    HOLDINGS, INC.


                                  By:___________________________________________
                                     Name:
                                     Title:


                                  PETROLEUM ASSOCIATES, L.P.


                                  By:__________________________________________
                                     Name:
                                     Title:

                                  KKR PARTNERS II, L.P.


                                  By:__________________________________________
                                     Name:
                                     Title:





                                       9
<PAGE>   10
Accepted as of the date hereof
at New York, New York:

SALOMON BROTHERS INTERNATIONAL LIMITED
CS FIRST BOSTON LIMITED
GOLDMAN SACHS INTERNATIONAL
MERRILL LYNCH INTERNATINOAL LIMITED


By: SALOMON BROTHERS INTERNATIONAL LIMITED,
      representative of the Underwriters










                                       10
<PAGE>   11
                                   SCHEDULE I




<TABLE>
<CAPTION>
                                                                                            Number of
                                                                                         Optional Shares
                                                              Total Number               to be Purchased
                                                             of Firm Shares                if Maximum
          Underwriter                                        to be Purchased            Option Exercised
          -----------                                        ---------------            ----------------
<S>                                                          <C>                        <C>
Salomon Brothers International Limited  . . . . . . .
CS First Boston Limited  . . . . . . . . .
Goldman Sachs International .   . . . . . . . . . . .
Merrill Lynch International Limited . . . . . . . . .        ______________             ______________

           Total  . . . . . . . . . . . . . . . . . .         2,000,000                      300,000
                                                          ==================            ================
</TABLE>
<PAGE>   12
                                  SCHEDULE II



<TABLE>
<CAPTION>
                                                                                                 Number of
                                                                                                 Optional Shares
                                                                  Total Number                   to be Sold
                                                                  of Firm Shares                 if Maximum
SELLING STOCKHOLDER                                               to be Sold                     Option Exercised
- -------------------                                               --------------                 ----------------
<S>                                                                  <C>                            <C>
Petroleum Associates, L.P.  . . . . . . . . . . . . .
KKR Partners II, L.P.   . . . . . . . . . . . . . . .
</TABLE>

<PAGE>   1
                                                                EXHIBIT 5.1



                              April 20, 1995




Board of Directors
Union Texas Petroleum Holdings, Inc.
1330 Post Oak Boulevard
Houston, Texas 77056

Gentlemen:

         In my capacity as General Counsel, Vice President-Administration and
Secretary of Union Texas Petroleum Holdings, Inc. (the "Company"), I have acted
as counsel in connection with the Company's Registration Statement on Form S-3
(the "Registration Statement") relating to registration under the Securities
Act of 1933, as amended, of the offering and sale of up to 11,500,000 shares of
Common Stock, par value $0.05 per share, of the Company (the "Common Stock")
(which includes an over-allotment option).  All of the 11,500,000 shares will be
offered by two limited partnerships affiliated with Kohlberg Kravis Roberts &
Co. (collectively, the "Selling Shareholder"). The shares will be offered by
the several underwriters represented by Salomon Brothers Inc and the other
co-managers (the "Underwriters").
        
         As the basis for the opinion hereinafter expressed, I have examined
such statutes, regulations, corporate records and documents, certificates of
corporate and public officials and other instruments as I have deemed necessary
or advisable for the purposes of this opinion. In such examination, I have
assumed the authenticity of all documents submitted to me as originals and the
conformity with the original documents of all documents submitted to me as
copies.

         Based on the foregoing and on such legal considerations as I deem
relevant, I am of the opinion that the 11,500,000 shares of Common Stock of the
Company, which includes the over-allotment option, to be sold by the Selling
Shareholder to the Underwriters as described in the Registration Statement have
been legally issued, and are currently outstanding, fully paid and
non-assessable.

         I hereby consent to the use of this opinion as an exhibit to the
Registration Statement and to the use of my name under the heading "Validity of
Common Stock" in the Registration Statement.


                                        Very truly yours,

                                        /s/  NEWTON W. WILSON, III

                                        Newton W. Wilson, III
                                        General Counsel, Vice President-
                                         Administration and Secretary
                                        Union Texas Petroleum Holdings, Inc.

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 of our report dated
January 25, 1995 appearing on page 33 of Union Texas Petroleum Holdings, Inc.'s
Annual Report on Form 10-K for the year ended December 31, 1994. We also consent
to the references to us under the headings "Experts" and "Selected Consolidated
Financial Data" in such Prospectus. However, it should be noted that Price
Waterhouse LLP has not prepared or certified such "Selected Consolidated
Financial Data."
 
PRICE WATERHOUSE LLP
 
Houston, Texas
April 20, 1995


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