HARKEN ENERGY CORP
10-Q, 1997-08-11
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-Q

         |X|      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1997

         |_|      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                       FOR THE TRANSITION PERIOD FROM ________ TO ________ 

                         COMMISSION FILE NUMBER 0-9207

                           HARKEN ENERGY CORPORATION
             (Exact name of registrant as specified in its charter)

         DELAWARE                                       95-2841597
(State or other jurisdiction of                      (I.R.S. Employer
incorporation or organization)                       Identification No.)

5605 N. MACARTHUR BLVD., SUITE 400                          75038
IRVING, TEXAS                                              (Zip Code)
(Address of principal executive offices)

       Registrant's telephone number, including area code (972) 753-6900


         INDICATE BY CHECK MARK WHETHER THE REGISTRANT (1) HAS FILED ALL
REPORTS REQUIRED TO BE FILED BY SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
ACT OF 1934 DURING THE PRECEDING 12 MONTHS (OR FOR SUCH SHORTER PERIOD THAT THE
REGISTRANT WAS REQUIRED TO FILE SUCH REPORTS), AND (2) HAS BEEN SUBJECT TO SUCH
FILING REQUIREMENTS FOR THE PAST 90 DAYS. YES [X] NO [ ]

         The number of shares of Common Stock, par value $0.01 per share,
outstanding as of August 1, 1997 was 115,585,483.

================================================================================




<PAGE>   2



                           HARKEN ENERGY CORPORATION
                           INDEX TO QUARTERLY REPORT
                                 JUNE 30, 1997



<TABLE>
<CAPTION>
                                                                                             PAGE
                                                                                             ----
<S>                                                                                          <C>
PART I.       FINANCIAL INFORMATION

     Item 1.        Condensed Financial Statements

                    Consolidated Condensed Balance Sheets.................................       4

                    Consolidated Condensed Statements of Operations.......................       5

                    Consolidated Condensed Statements of Stockholders' Equity.............       6

                    Consolidated Condensed Statements of Cash Flow........................       7

                    Notes to Consolidated Condensed Financial Statements..................       8


     Item 2.        Management's Discussion and Analysis of Financial Condition
                    and Results of Operations.............................................      18


PART II.      OTHER INFORMATION

                    Notes Concerning Other Information....................................      25

SIGNATURES          ......................................................................      28
</TABLE>



                                       2

<PAGE>   3



                         PART I - FINANCIAL INFORMATION


                                      3

<PAGE>   4



                   ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS
                   HARKEN ENERGY CORPORATION AND SUBSIDIARIES
                     CONSOLIDATED CONDENSED BALANCE SHEETS
                                  (unaudited)





<TABLE>
<CAPTION>
                                                                        DECEMBER 31,      JUNE 30,
                                                                           1996             1997
                                                                       -------------    -------------
<S>                                                                    <C>              <C>          
ASSETS

Current Assets:
     Cash and temporary investments ................................   $   9,855,000    $  22,624,000
     Cash in European segregated accounts ..........................      37,662,000       86,872,000
     Accounts receivable, net ......................................       2,058,000        1,946,000
     Prepaid expenses and other current assets .....................         263,000          430,000
                                                                       -------------    -------------
          Total Current Assets .....................................      49,838,000      111,872,000

Property and Equipment, net ........................................      70,035,000       81,052,000

Other Assets, net ..................................................       3,127,000        6,990,000
                                                                       -------------    -------------
                                                                       $ 123,000,000    $ 199,914,000
                                                                       =============    =============


LIABILITIES AND STOCKHOLDERS' EQUITY


Current Liabilities:
     Trade payables ................................................   $   1,272,000    $   1,746,000
     Accrued liabilities and other .................................       3,889,000        4,056,000
     Revenues and royalties payable ................................         900,000          736,000
                                                                       -------------    -------------
          Total Current Liabilities ................................       6,061,000        6,538,000

European Convertible Notes Payable .................................      38,600,000       89,300,000

Commitments and Contingencies (Note 9)

Stockholders' Equity:
     Common stock, $0.01 par value; 150,000,000 shares authorized;
         93,862,266 and 105,358,246 shares issued, respectively ....         939,000        1,054,000
     Additional paid-in capital ....................................     171,191,000      195,292,000
     Retained deficit ..............................................     (92,401,000)     (92,270,000)
     Treasury stock, 440,896 shares held at December 31, 1996 ......      (1,390,000)            --
                                                                       -------------    -------------
          Total Stockholders' Equity ...............................      78,339,000      104,076,000
                                                                       -------------    -------------
                                                                       $ 123,000,000    $ 199,914,000
                                                                       =============    =============
</TABLE>

  The accompanying Notes to Consolidated Financial Statements are an integral
                           part of these Statements.

                                       4

<PAGE>   5



                   HARKEN ENERGY CORPORATION AND SUBSIDIARIES
                CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS
                                  (unaudited)



<TABLE>
<CAPTION>
                                                     THREE MONTHS ENDED            SIX MONTHS ENDED
                                                         JUNE 30,                      JUNE 30,
                                                ---------------------------   ----------------------------
                                                    1996           1997           1996            1997
                                                ------------   ------------   ------------    ------------
<S>                                             <C>            <C>            <C>             <C>         
Revenues:
     Oil and gas operations .................   $  2,388,000   $  3,164,000   $  4,385,000    $  6,844,000
     Interest and other income ..............        202,000        863,000        546,000       1,434,000
                                                ------------   ------------   ------------    ------------
                                                   2,590,000      4,027,000      4,931,000       8,278,000
                                                ------------   ------------   ------------    ------------

Costs and Expenses:
     Oil and gas operating expenses .........        840,000      1,247,000      1,600,000       2,486,000
     General and administrative
         expenses, net ......................        980,000      1,166,000      1,797,000       2,500,000
     Depreciation and amortization ..........        629,000      1,239,000      1,256,000       2,330,000
     Interest expense and other, net ........         73,000        329,000        506,000         848,000
                                                ------------   ------------   ------------    ------------
                                                   2,522,000      3,981,000      5,159,000       8,164,000
                                                ------------   ------------   ------------    ------------

        Income (loss) before income taxes ...         68,000         46,000       (228,000)        114,000

Income tax expense ..........................           --             --             --              --
                                                ------------   ------------   ------------    ------------

        Net income (loss) ...................   $     68,000   $     46,000   $   (228,000)   $    114,000
                                                ============   ============   ============    ============

Income (loss) per common share:
        Net income (loss) ...................   $       0.00   $       0.00   $      (0.00)   $       0.00
                                                ============   ============   ============    ============

Weighted average shares outstanding .........     82,048,561    107,666,856     77,836,034     103,668,547
                                                ============   ============   ============    ============
</TABLE>











  The accompanying Notes to Consolidated Financial Statements are an integral
                           part of these Statements.

                                       5

<PAGE>   6



                  HARKEN ENERGY CORPORATION AND SUBSIDIARIES
           CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY
                                  (unaudited)



<TABLE>
<CAPTION>
                                                            ADDITIONAL
                                               COMMON        PAID-IN       RETAINED
                                               STOCK         CAPITAL        DEFICIT       TREASURY STOCK
                                            ------------   ------------   ------------    ------------
<S>                                         <C>            <C>            <C>             <C>          
Balance, December 31, 1995 ..............   $    759,000   $136,435,000   $(92,047,000)   $ (4,997,000)
  Issuance of common stock, net .........         90,000     22,090,000           --         3,607,000
  Conversions of European notes payable .         90,000     12,666,000           --              --
  Equity adjustment from foreign currency
       translation ......................           --             --          (13,000)           --
  Net loss ..............................           --             --         (341,000)           --
                                            ------------   ------------   ------------    ------------
Balance, December 31, 1996 ..............        939,000    171,191,000    (92,401,000)     (1,390,000)
  Issuance of common stock, net .........         41,000      7,551,000           --              --
  Conversions of European notes payable .         74,000     16,550,000           --         1,390,000
  Equity adjustment from foreign currency
       translation ......................           --             --           17,000            --



  Net income ............................           --             --          114,000            --
                                            ------------   ------------   ------------    ------------
Balance, June 30, 1997 ..................   $  1,054,000   $195,292,000   $(92,270,000)   $       --
                                            ============   ============   ============    ============
</TABLE>




  The accompanying Notes to Consolidated Financial Statements are an integral
                           part of these Statements.


                                       6

<PAGE>   7



                   HARKEN ENERGY CORPORATION AND SUBSIDIARIES
                CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                                  (unaudited)



<TABLE>
<CAPTION>
                                                                                      SIX MONTHS ENDED
                                                                                          JUNE 30,
                                                                                 ----------------------------
                                                                                     1996            1997
                                                                                 ------------    ------------
<S>                                                                              <C>             <C>         
Cash flows from operating activities:
  Net income (loss) ..........................................................   $   (228,000)   $    114,000
    Adjustment to reconcile net income (loss) to net cash provided by
        operating activities:
       Depreciation and amortization .........................................      1,256,000       2,330,000
       Loss on sales of assets and other .....................................         19,000            --
       Accretion of note payable .............................................        234,000            --
       Amortization of European note issuance costs ..........................        178,000         246,000

   Change in assets and liabilities:
       Decrease in accounts receivable .......................................        (81,000)        112,000
       Decrease in trade payables and other ..................................       (420,000)       (223,000)
                                                                                 ------------    ------------
            Net cash provided by operating activities ........................        958,000       2,579,000
                                                                                 ------------    ------------

Cash flows from investing activities:
       Proceeds from sales of assets .........................................        177,000           6,000
       Investor advances .....................................................      2,250,000       3,779,000
       Capital expenditures, net .............................................     (3,945,000)    (11,143,000)
                                                                                 ------------    ------------
            Net cash used in investing activities ............................     (1,518,000)     (7,358,000)
                                                                                 ------------    ------------

Cash flows from financing activities:
       Transfer from segregated account cash .................................     10,000,000      15,302,000
       Proceeds from issuances of common stock, net of issuance costs ........      2,492,000       2,224,000
       Repayments of notes payable and long-term obligations .................     (1,258,000)           --
       Investment in segregated account cash, net ............................       (242,000)         22,000
                                                                                 ------------    ------------
            Net cash provided by financing activities ........................     10,992,000      17,548,000
                                                                                 ------------    ------------

Net increase in cash and temporary investments ...............................     10,432,000      12,769,000
Cash and temporary investments at beginning of period ........................      4,456,000       9,855,000
                                                                                 ------------    ------------
Cash and temporary investments at end of period ..............................   $ 14,888,000    $ 22,624,000
                                                                                 ============    ============

Supplemental disclosures of cash flow information: Cash paid during the period
  for:
     Interest ................................................................   $    203,000    $      2,000
     Income taxes ............................................................           --              --
</TABLE>


  The accompanying Notes to Consolidated Financial Statements are an integral
                           part of these Statements.

                                       7

<PAGE>   8



                   HARKEN ENERGY CORPORATION AND SUBSIDIARIES
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                             JUNE 30, 1996 AND 1997
                                  (unaudited)


(1)      MANAGEMENT'S REPRESENTATIONS

         In the opinion of Harken Energy Corporation ("Harken"), the
accompanying unaudited consolidated condensed financial statements contain all
adjustments necessary to present fairly its financial position as of December
31, 1996 and June 30, 1997 and the results of its operations and changes in its
cash flows for all periods presented as of June 30, 1996 and 1997. These
adjustments represent normal recurring items.

         The accompanying unaudited condensed financial statements have been
prepared pursuant to the rules and regulations of the Securities and Exchange
Commission ("SEC"). Certain information and note disclosures normally included
in annual financial statements prepared in accordance with generally accepted
accounting principles have been condensed or omitted pursuant to these rules
and regulations, although Harken believes that the disclosures made are
adequate to make the information presented not misleading. It is suggested that
these condensed financial statements be read in conjunction with the financial
statements and the notes thereto included in Harken's Form 10-K for the year
ended December 31, 1996.

         The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reported period. Actual results could differ from these estimates.

         The results of operations for the six month period ended June 30, 1997
are not necessarily indicative of the results to be expected for the full year.

(2)      ACQUISITIONS

         Acquisition of EnerVest Properties -- On July 10, 1996 Harken, along
with Harken Exploration, a wholly-owned subsidiary, purchased working interests
in certain producing oil and gas properties located in the Magnolia region of
Arkansas and in the Carlsbad region of New Mexico (the "EnerVest Properties")
from EnerVest Acquisition-II Limited Partnership ("EnerVest"). The purchase
price of approximately $15,200,000, plus the assumption of certain operational
liabilities relating to these properties, was paid in the form of $5,000,000
cash paid at closing, 1,550,000 shares of Harken common stock which were issued
following closing, and 1,400,000 shares of Harken common stock which were
issued in March 1997. Harken also issued to EnerVest warrants to purchase, over
a period of three years from closing, 300,000 restricted shares of Harken
common stock at an exercise price of $2.75 per share.

         Acquisition of Additional Four Corners Property Interests -- During
the second quarter of 1996, Harken acquired additional interests in its oil and
gas operations in the Four Corners area of Arizona, Utah and New Mexico (the
"Four Corners Properties") which resulted in Harken increasing its ownership in
the Navajo Reservation reserves, exploration acreage, development drilling
locations and the Aneth Gas Plant. The acquisition of the sellers' interest
raised Harken's total interest in the Four Corners Properties from



                                       8

<PAGE>   9



approximately 82% to approximately 94% of Harken's total operated interest. The
consideration consisted of $338,000 cash plus the issuance of approximately
509,000 shares of restricted Harken common stock. Harken also assumed certain
liabilities of the seller relating to the property interests. On June 30, 1997,
Harken acquired the remaining operating interest in the Four Corners Properties
for approximately $450,000 cash. Harken also assumed certain liabilities of the
seller relating to the property interests.

(3)      PROPERTY AND EQUIPMENT

         A summary of property and equipment follows:


<TABLE>
<CAPTION>
                                                 December 31,      June 30,
                                                     1996            1997
                                                 ------------    ------------
<S>                                              <C>             <C>         
Unevaluated oil and gas properties--
       Unevaluated international properties      $  3,656,000    $  8,000,000
       Unevaluated domestic properties              6,610,000       6,696,000
Evaluated oil and gas properties--
       Evaluated international properties           5,802,000      12,402,000
       Evaluated domestic properties               60,188,000      62,094,000
Gas plant and other property                        7,500,000       7,934,000
Less accumulated depreciation and amortization    (13,721,000)    (16,074,000)
                                                 ------------    ------------
                                                 $ 70,035,000    $ 81,052,000
                                                 ============    ============
</TABLE>

(4)      COLOMBIAN OPERATIONS

         Alcaravan Contract -- During the third quarter of 1992, Harken de
Colombia, Ltd., a wholly-owned subsidiary of Harken, was awarded the exclusive
right to explore for, develop and produce oil and gas throughout the Alcaravan
area of Colombia. The Alcaravan area is located in Colombia's Llanos Basin and
is located approximately 140 miles east of Santafe De Bogota. Harken and
Empresa Colombiana de Petroleos ("Ecopetrol") have entered into an Association
Contract (the "Alcaravan Contract") which currently requires Harken to conduct
a seismic and exploratory drilling program on approximately 210,000 acres in
the Alcaravan area during the initial six years of the Alcaravan Contract. At
the end of each of the first six years of the Alcaravan Contract, Harken has
the option to withdraw from the Alcaravan Contract or to commit to the next
year's work requirements. If during the initial six years of the Alcaravan
Contract, Harken discovers one or more fields capable of producing oil or gas
in quantities that are economically exploitable and Ecopetrol agrees that such
field is economically exploitable (a "commercial discovery"), the term of the
Alcaravan Contract will be extended for a period of 22 years from the date of
such commercial discovery. Harken has completed all work requirements for the
first three years of the Alcaravan Contract.

         Upon a discovery of a field capable of commercial production, and upon
commencement of production from that commercial field, Ecopetrol will reimburse
Harken for 50% of Harken's successful well costs expended up to the point of
declaration of a commercial discovery. Production from the field following a
commercial discovery will be allocated as follows: Ecopetrol, on behalf of the
Colombian government, will



                                       9

<PAGE>   10



receive a 20% royalty interest in all production and all production (after
royalty payments) will be allocated 50% to Ecopetrol and 50% to Harken until
cumulative production in such field reaches 60 million barrels of oil, after
which Ecopetrol's share of production will progressively increase and Harken's
share will progressively decrease until cumulative production from the field
reaches 150 million barrels of oil, and thereafter all production will be
allocated 70% to Ecopetrol and 30% to Harken. If more than one commercially
declared field is discovered on the Alcaravan area, the production sharing
percentages applicable to the field with the greatest cumulative production
will be applied to all fields within the Alcaravan area. After declaration of a
commercial discovery, Harken and Ecopetrol will be responsible for all future
development costs and operating expenses in direct proportion to their interest
in production.

         Harken spudded the Estero #1 exploratory well located on the Palo
Blanco prospect within the Alcaravan area in early February 1997, and drilled
to a depth of 8,608 feet to test the Carbonera, Mirador, Guadalupe, Gacheta and
Ubaque formations. Initial production testing of the Ubaque formation of the
Estero #1 well, produced with an electric submersible pump, indicated a rate of
4,116 barrels of oil per day. This production rate was limited by the capacity
of the submersible pump and surface storage facilities at the location. Harken
is currently investigating potential methods to efficiently produce this field,
including possible pipeline connections and trucking arrangements.

         Harken de Colombia, Ltd. has entered into an operating agreement (the
"Rochester Agreement") with Rochester Energy Corporation ("Rochester", a
Canadian corporation) pursuant to which Rochester has paid 331/3% of the
aggregate costs of the Estero #1 well, and 25% of the aggregate costs related
to the second well to be drilled on the Palo Blanco prospect, the Estero #2,
and the initial well to be drilled on the Anteojos prospect, the Canacabare #1.
In exchange, Rochester, upon its full performance, will acquire a beneficial
interest equal to 25% of the interest held by Harken de Colombia, Ltd. in these
wells. The Estero #2 well and the Canacabare #1 well are scheduled to begin
drilling during the fourth quarter of 1997 or early 1998.

         Harken de Colombia, Ltd., has entered into a financing agreement ("the
Parkcrest Financing Agreement") with Parkcrest Explorations, Ltd. ("Parkcrest",
a Canadian corporation) which covers the Palo Blanco prospect, and includes
options on additional prospects, all located within the Alcaravan Contract
area. Under the terms of the Parkcrest Financing Agreement, Parkcrest paid a
project fee of $250,000 to Harken and prepaid 331/3% of the estimated drilling
and completion costs of the Estero #1 well and committed to pay 25% of the
aggregate costs of the Estero #2 well to be drilled on the Palo Blanco prospect
in exchange for a beneficial interest equal to 25% of the interest held by
Harken de Colombia, Ltd. in these wells.

         Bocachico Contract -- In January 1994, Harken de Colombia, Ltd. signed
its second Association Contract (the "Bocachico Contract") with Ecopetrol,
covering the Bocachico Contract area. Under the Bocachico Contract, Harken has
acquired the exclusive rights to conduct exploration activities and drilling on
this area, which covers approximately 192,000 acres in the Middle Magdalena
Valley of Central Colombia. During the initial six year term of the Bocachico
Contract, if Harken makes a commercial discovery on one or more prospect areas
in the contract area, the contract covering such prospect area(s) will be
further extended for a period of 22 years from the date of any commercial
discovery of oil and/or gas. The production sharing arrangements under the
Bocachico Contract are substantially similar to those under the Alcaravan
Contract.

         During the first year of the Bocachico Contract, Harken conducted
seismic activities on the lands covered by this contract. During each of the
second through the sixth contract years, Harken may elect to



                                       10

<PAGE>   11



continue the contract by committing to the drilling of at least one exploratory
well during each contract year. Harken has completed all work requirements for
the first three years of the Bocachico Contract.

         Harken spudded its first well on this Bocachico Contract area, named
the Torcaz #2 well, in July 1996. This well was completed and initially tested
at the rate of 635 barrels per day. Harken encountered numerous mechanical
problems with the down-hole submersible electric pump compounded by apparent
reservoir formation damage which may have occurred in the completion process.
Harken is currently carrying out recompletion efforts on this well.

         In late April 1997, Harken began drilling operations on the Torcaz #3
well, located on the Rio Negro prospect in the Bocachico Contract area. This
well initially tested at a rate of 643 barrels per day. In July 1997, Harken
also submitted its notification to Ecopetrol to extend the Bocachico Contract
into its fourth contractual year by committing to drill the third exploratory
well covering the Bocachico Contract area. Harken has further currently
identified eight additional potential well locations and has filed applications
for environmental permits on two additional well locations within the Bocachico
Contract area. In July 1997, Harken announced plans to acquire approximately
500 kilometers of new seismic data to further evaluate portions of both the
Bocachico and Cambulos Contract areas.

         In October 1995, Harken entered into a Development Finance Agreement
(the "Rio Negro Development Finance Agreement") with Arbco Associates L.P.,
Offense Group Associates L.P., Kayne Anderson Nontraditional Investments L.P.
and Opportunity Associates L.P. (collectively, the "Rio Negro Investors"),
pursuant to which the Rio Negro Investors agreed to provide up to $3,500,000 to
Harken to finance drilling on the Rio Negro prospect in the Bocachico Contract
area in exchange for the right to receive future payments from Harken equal to
40% of the net profits that Harken de Colombia, Ltd. may derive from the sale
of oil and gas produced from the Rio Negro prospect (the "Participation").

         In March 1997, Harken and the Rio Negro Investors entered into a
Conversion Agreement whereby Harken purchased 75% of the Participation relating
to the Rio Negro Development Finance Agreement in exchange for 900,000
restricted shares of Harken common stock which were issued within 30 days
following closing. From the remaining 25% of the Participation retained, the
Rio Negro Investors have the right to receive 10% of the net profits that
Harken de Colombia, Ltd., may derive from the sale of oil and gas produced from
the Rio Negro prospect.

         Cambulos Contract -- In September 1995, Harken de Colombia, Ltd.
signed an additional Association Contract (the "Cambulos Contract") with
Ecopetrol, covering the Cambulos Contract area. Under the Cambulos Contract,
Harken has acquired the exclusive rights to conduct exploration activities in
the Cambulos Contract area, which covers approximately 300,000 acres in the
Middle Magdalena Valley of Central Colombia.

         During the first two years of the Cambulos Contract, Harken is
required to conduct geologic studies on the lands covered by this contract,
including reprocessing of at least 400 kilometers of existing seismic data and
the acquisition of at least 90 kilometers of new seismic data. As of June 30,
1997, Harken has completed a preliminary environmental study for the Cambulos
Contract area and is currently conducting the obligatory work program required
during the first two years of the Cambulos Association contract. During each of
the third through the sixth contract years, Harken may elect to continue the
contract by committing to the drilling of at least one exploratory well during
each contract year.



                                       11

<PAGE>   12



         If during the initial six years of the Cambulos Contract, Harken
discovers a field capable of commercial production of oil or gas, the term of
the Cambulos Contract will be extended for a period of 22 years from the date
of such commercial discovery. Upon a commercial discovery and at the initiation
of production from the commercial field, Harken will be reimbursed by Ecopetrol
for 50% of all seismic costs and dry well costs incurred prior to the point at
which a declaration of a commercial discovery is made in addition to being
reimbursed for 50% of its successful direct exploratory well costs expended up
to the point of declaration of a commercial discovery. Production from a
commercial discovery will be allocated as follows: Ecopetrol, on behalf of the
Colombian government, will receive a 20% royalty interest in all production,
and all production (after royalty payments) will be allocated 50% to Ecopetrol
and 50% to Harken until cumulative production from all fields in the Cambulos
acreage reaches 60 million barrels of oil, after which Ecopetrol's share of
production will increase progressively to 75% and Harken's share will decrease
progressively to 25% determined by a formula based on Harken's recovery of its
total expenditures under the Cambulos Contract. After a declaration of a
commercial discovery, Harken and Ecopetrol will be responsible for all future
development costs and operating expenses in direct proportion to their interest
in production.

         In July 1997, Harken announced plans to acquire approximately 500
kilometers of new seismic data to further evaluate portions of both the
Bocachico and Cambulos Contract areas.

         Bolivar Contract -- In May 1996, Harken de Colombia, Ltd. signed an
additional Association Contract (the "Bolivar Contract") with Ecopetrol,
covering the Bolivar Contract area. Under the Bolivar Contract, Harken has
acquired the exclusive rights to conduct exploration activities in the Bolivar
Contract area, which covers approximately 250,000 acres in the Northern Middle
Magdalena Valley of Central Colombia.

         During the first two years of the Bolivar Contract, Harken's work
program will consist of preparing an engineering study of the Buturama and
Totumal fields located on and adjacent to this acreage, the reprocessing of 350
kilometers of existing seismic data and the acquisition of 100 kilometers of
new seismic data on this contract area. During each of the third through the
sixth contract years, Harken may elect to continue the contract by committing
to the drilling of at least one exploratory well during each contract year. The
production sharing arrangements under the Bolivar Contract are substantially
similar to those under the Cambulos Contract.

         Harken plans to horizontally drill a three well exploratory program on
the Bolivar Contract area in which Harken intends to keep 100% of the ownership
interest. Subject to receipt of all necessary permits, Harken intends to drill
its first exploratory well on the Bolivar Contract area in the third quarter of
1997.

(5)      EUROPEAN CONVERTIBLE NOTES PAYABLE

         8% European Notes -- During the second quarter of 1995, Harken issued
to qualified purchasers a total of $15 million in 8% Senior Convertible Notes
(the "8% European Notes") which were to mature in May 1998. Interest on these
notes was payable semi-annually in May and November of each year to maturity or
until the 8% European Notes were converted. Such 8% European Notes were
convertible at any time by the holders into shares of Harken common stock at a
conversion price of $1.50 per share ("the 8% European Note Conversion Price").
In connection with the sale and issuance of the 8% European Notes, Harken paid
approximately $1,750,000 from the 8% European Note proceeds for commissions and
issuance costs. Between September 30, 1995 and July 31, 1996, all holders of
these 8% European Notes exercised



                                       12

<PAGE>   13



their conversion options and Harken issued an aggregate total of 9,999,975
shares of Harken common stock pursuant to these conversions.

         6 1/2% European Notes -- On July 30, 1996, Harken issued to qualified
purchasers a total of $40 million in 6 1/2% Senior Convertible Notes (the "6
1/2% European Notes") which were to mature on July 30, 2000. In connection with
the sale and issuance of the 6 1/2% European Notes, Harken paid approximately
$3,142,000 from the 6 1/2% European Note proceeds for commissions and issuance
costs. Interest incurred on these notes was payable semi-annually in January
and July of each year to maturity or until the 6 1/2% European Notes were
converted. Such 6 1/2% European Notes were convertible at any time by the
holders into shares of Harken common stock at a conversion price of $2.50 per
share ("the 6 1/2% European Note Conversion Price"). The 6 1/2% European Notes
were also convertible by Harken into shares of Harken common stock after one
year following issuance, if for any period of thirty consecutive days
commending on or after November 28, 1996, the closing price of Harken common
stock for each trading day during such period shall have equaled or exceeded
135% of the 6 1/2% European Note Conversion Price (or $3.375 per share of
Harken common stock).

         During the last half of 1996, holders of 6 1/2% European Notes
totaling $1,400,000 exercised their conversion option and such holders were
issued 560,000 shares of Harken common stock. During the first six months of
1997, holders of 6 1/2% European Notes totaling $19,300,000 exercised their
conversion option and such holders were issued 7,720,000 shares of Harken
common stock. In February 1997, Harken gave notice as required under the Trust
Indenture that it had met the market price criteria necessary to call for
mandatory conversion of the 6 1/2% European Notes and on June 2, 1997 formally
called the 6 1/2% European Notes for conversion on July 31, 1997. On July 31,
1997, Harken converted the remaining 6 1/2% European Notes into 7,720,000
shares of Harken common stock.

         5 1/2% European Notes -- On June 11, 1997, Harken issued to qualified
purchasers a total of $70 million in 5 1/2% Senior Convertible Notes ( the "5
1/2% European Notes") which mature on June 10, 2002. In connection with the
sale and issuance of the 5 1/2% European Notes, Harken paid approximately
$5,174,000 from the 5 1/2% European Notes proceeds for commissions and issuance
costs. Interest incurred on these notes is payable semi-annually in June and
December of each year to maturity or until the 5 1/2% European Notes are
converted. Such 5 1/2% European Notes are convertible into shares of Harken
common stock at an initial conversion price of $5.00 per share, subject to
adjustment in certain circumstances ("the 5 1/2% European Note Conversion
Price"). A five percent premium on the number of shares of Harken common stock
issuable on conversion will be payable to holders converting the 5 1/2%
European Notes prior to December 11, 1997. The 5 1/2% European Notes are also
convertible by Harken into shares of Harken common stock after one year
following issuance, if for any period of thirty consecutive days commencing on
or after June 11, 1997, the average of the closing prices of Harken common
stock for each trading day during such thirty day period shall have equaled or
exceeded 130% of the 5 1/2% European Note Conversion Price (or $6.50 per share
of Harken common stock). As of August 1, 1997, holders of 5 1/2% European Notes
totaling $6,730,000 have exercised their conversion option and such holders
were issued 1,413,000 shares of Harken common stock. The 5 1/2% European Notes
are listed on the Luxembourg Stock Exchange.

         Upon closing, all proceeds from the sale of each of the European Notes
issuances were each initially paid to a Trustee under the terms of a Trust
Indenture covering each issue and held in separate interest bearing Trust
accounts (the "Segregated Accounts") to be maintained for Harken's benefit,
until the Trustee is presented with evidence of sufficient asset value, as
defined in the Trust Indenture, held by Harken to permit an advance of a
portion of the proceeds. Until all of the 5 1/2% European Notes are converted,
Harken



                                       13

<PAGE>   14



must maintain an Asset Value Coverage Ratio equal to or greater than 1:1 which
is calculated as the ratio of (i) the sum of (x) 100% of the aggregate amount
of Harken's cash on deposit in the Segregated Accounts plus (y) 50% of the net
present value of Harken's domestic unencumbered total proved reserves plus (z)
25% of the net present value of Harken's Colombian total proved reserves to
(ii) the aggregate outstanding principal amount of the 5 1/2% European Notes.
Upon a conversion, any proceeds attributable to the 5 1/2% European Notes
converted which remain in the Segregated Accounts may be withdrawn by Harken
without regard to the asset value then existing.

         The 5 1/2% European Notes were sold strictly to non-U.S. purchasers in
the form of bearer instruments in $10,000 and $50,000 increments. The 5 1/2%
European Notes and the Harken common stock issuable upon conversion of the 5
1/2% European Notes have been or will be issued without registration under the
United States Securities Act of 1933 (the "Securities Act") pursuant to an
exemption contained in Regulation S promulgated under the Securities Act.

         Commissions and issuance costs associated with the European Notes are
deferred and are included in Other Assets and are amortized to interest expense
over the period until conversion or maturity of the European Notes. As European
Notes are converted to Harken common stock, a pro-rata portion of these
deferred costs are charged to Additional Paid-In Capital.

         All Segregated Account cash related to the 6 1/2% European Notes is
reflected as a current asset at December 31, 1996, and June 30, 1997 as Harken
had the intent and ability to convert all outstanding 6 1/2% European Notes to
Harken common stock prior to December 31, 1997. During March 1997, Harken
transferred approximately $15.3 million of 6 1/2% European Note proceeds from
the Segregated Accounts to Harken's operating cash account due to the
conversions of the 6 1/2% European Notes. The initial cash proceeds from the
issuance of the European Notes are not included in the Statement of Cash Flows
because the proceeds are not considered to be cash equivalents. Transfers of
proceeds from the Segregated Accounts are included in cash flows from financing
activities in the accompanying consolidated statements of cash flows.

(6)      STOCKHOLDERS' EQUITY

         Common Stock -- Harken currently has authorized 150,000,000 shares of
$.01 par common stock. At December 31, 1996 and June 30, 1997, Harken had
issued 93,862,266 and 105,358,246 shares, respectively. Harken held 400,896
shares as treasury stock at a cost of $1,390,000 at December 31, 1996.

         Acquisition of Additional Four Corners Property Interests -- In April
1996, Harken acquired an additional interest in the Four Corners Properties in
exchange for, among other consideration, 509,000 restricted shares of Harken
common stock. See Note 2 -- Acquisitions for further discussion.

         Issuance of European Convertible Notes Payable -- At December 31,
1995, $2,450,000 of the 8% European Notes had been converted into 1,633,327
shares of Harken common stock. In 1996, all of the remaining outstanding 8%
European Notes were converted into 8,366,648 additional shares of Harken common
stock. In connection with the issuance of the 8% European Notes, Harken issued
to the placement agents for the 8% European Notes warrants to purchase one
million shares of Harken common stock at any time on or before May 11, 1999 at
an exercise price of $1.50 per share. As of July 31, 1997 all but approximately
37,000 of these warrants had been exercised for shares of Harken common stock.




                                       14

<PAGE>   15



         In July 1996, Harken issued to qualified purchasers a total of $40
million in 6 1/2% European Notes which were to mature on July 30, 2000. The 6
1/2% European Notes were convertible under certain terms into approximately
16,000,000 shares of Harken common stock. During the last half of 1996, holders
of 6 1/2% European Notes totaling $1,400,000 exercised their conversion option
and such holders were issued 560,000 shares of Harken common stock. During the
first six months of 1997, holders of 6 1/2% European Notes totaling an
additional $19,300,000 exercised their conversion option and such holders were
issued 7,720,000 shares of Harken common stock, a portion of which had been
held as treasury shares. In February 1997, Harken gave notice as required under
the Trust Indenture that it had met the market price criteria necessary to call
for mandatory conversion of the 6 1/2% European Notes (see Note 5 -- European
Convertible Notes Payable for further discussion), and on July 31, 1997, Harken
converted the remaining $19,300,000 balance of the 6 1/2% European Notes into
7,720,000 shares of Harken common stock.

         In connection with the issuance of the 6 1/2% European Notes, Harken
issued to the placement agents for the 6 1/2% European Notes warrants to
purchase 1,280,000 shares of Harken common stock at any time on or before July
31, 1999 at an exercise price of $2.50 per share. In July 1997, approximately
492,000 of these warrants were exercised for shares of Harken common stock.

         In June 1997, Harken issued to qualified purchasers a total of $70
million in 5 1/2% European Notes which mature on June 11, 2002. The 5 1/2%
European Notes are convertible under certain terms into a maximum of
approximately 14,700,000 shares of Harken common stock. In connection with the
issuance of the 5 1/2% European Notes, Harken issued to the placement agents
for the 5 1/2% European Notes warrants to purchase 1,120,000 shares of Harken
common stock at any time after December 11, 1997 and on or before December 11,
1999 at an exercise price of $5.00 per share. As of August 1, 1997, holders of
5 1/2% European Notes totaling $6,730,000 have exercised their conversion
option and such holders were issued 1,413,000 shares of Harken common stock.

         Private Placements of Common Stock -- In March 1996, Harken received
$1,289,000 related to the sale of 1,040,000 shares of Harken common stock
previously held as treasury stock. In connection with certain of these
placements, Harken issued to certain financial advisors warrants to purchase an
aggregate total of 410,000 shares of Harken common stock at an average exercise
price of $1.71 per share. During 1997, these warrants were exercised for shares
of Harken common stock.

         Acquisition of EnerVest Properties -- On July 10, 1996, Harken
Exploration acquired the EnerVest Properties for a purchase price valued at
approximately $15,200,000 and the assumption of certain operational liabilities
relating to these properties. See Note 2 - Acquisitions for further discussion.
The preliminary purchase price consisted of 1,550,000 in shares of Harken
common stock issued after closing, $5,000,000 in cash payable at closing, and
an additional number of shares of Harken common stock to be issued in the
future subject to certain contingencies. Harken also issued to EnerVest
warrants to purchase, for a period of three years from closing, 300,000
restricted shares of Harken common stock at an exercise price of $2.75 per
share.

         In March 1997, Harken and EnerVest entered into a Resolution and
Settlement Agreement whereby in addition to the 1,550,000 shares of Harken
common stock previously issued to EnerVest as discussed above, Harken issued
1,400,000 shares of Harken common stock as final consideration for the purchase
of the EnerVest Properties. As a result of the Resolution and Settlement
Agreement, there are no remaining shares of Harken common stock to be issued
and all adjustments or property defects issues were resolved.




                                       15

<PAGE>   16



         Palo Blanco Development Finance Agreements -- In June 1996, Harken,
along with Harken de Colombia, Ltd. entered into separate Development Finance
Agreements with two investors. Under the terms of the agreements, the two
investors agreed to provide an aggregate of $2,500,000 to finance the drilling
of a well on the Palo Blanco prospect in the Alcaravan Association Contract
area. See Note 4 - Colombian Operations for further discussion of the Alcaravan
Association Contract. In return for the $2,500,000, the investors were
initially granted a beneficial interest in 40% of the net profits from the Palo
Blanco prospect which might have been received by Harken de Colombia, Ltd. In
1996, the investors exercised their rights under the agreement to convert
one-half of their beneficial interest into 599,988 shares of restricted Harken
common stock. During the first quarter of 1997, the investors exercised their
right to convert the remaining portion of their beneficial interest into an
additional 599,988 shares of restricted Harken common stock.

         Rio Negro Development Finance Agreement -- In March 1997, Harken and
the Rio Negro Investors entered into a Conversion Agreement whereby Harken
purchased 75% of the Participation relating to the Rio Negro Development
Finance Agreement for 900,000 restricted shares of Harken common stock. These
shares were issued in April 1997. See Note 4 - Colombian Operations for further
discussion of the Rio Negro Development Finance Agreement and the Bocachico
Association Contract.

(7)      PER SHARE DATA

         Per share data is based on the weighted average number of common
shares outstanding during each period. Common stock equivalents, contingently
issuable shares and other potentially dilutive securities are not included in
the computation of earnings per share if the effect of inclusion would be
antidilutive. For purposes of calculating earnings per share, the unconverted
European Convertible Notes discussed above are considered not to be common
stock equivalents.

         In March 1997, the Financial Accounting Standards Board issued
Statement of Financial Accounting Standard No. 128, "Earnings per Share" ("SFAS
128") which will be adopted in December 1997. Under SFAS 128, weighted average
shares outstanding under basic and diluted earnings per share calculations
would not have been materially different for either the three month or six
month period ended June 30, 1997.

(8)      INCOME TAXES

         At June 30, 1997, Harken had available for federal income tax
reporting purposes, net operating loss (NOL) carryforward for regular tax
purposes of approximately $67,000,000 which expires in 1997 through 2011,
alternative minimum tax NOL carryforward of approximately $57,000,000 which
expires in 1997 through 2011, investment tax credit carryforward of
approximately $857,000 which expires in 1997 through 2002, statutory depletion
carryforward of approximately $1,800,000 which does not have an expiration
date, and a net capital loss carryforward of approximately $12,400,000 which
expires in 2007 through 2011. Approximately $16,000,000 of the net operating
loss carryforward has been acquired with the purchase of subsidiaries and must
be used to offset future income from profitable operations within those
subsidiaries.

         Total deferred tax liabilities, relating primarily to property and
equipment, as of June 30, 1997, computed under the provisions of the Statement
of Financial Accounting Standard No. 109, "Accounting for Income Taxes", were
approximately $5,440,000. Total deferred tax assets, primarily related to the
net operating loss carryforward, were approximately $22,624,000 at June 30,
1997. The total net deferred tax asset is offset by the valuation allowance of
approximately $17,184,000 at June 30, 1997.




                                       16

<PAGE>   17



(9)      COMMITMENTS AND CONTINGENCIES

         The Aneth Gas Plant facility, of which Harken Southwest Corporation
("HSW", a wholly-owned subsidiary) is a co-owner, was in operation for many
years prior to HSW's becoming an owner. The operations at the Aneth Gas Plant
previously used open, unlined drip pits for storage of various waste products.
The present plant owners, including HSW, have replaced all of the open ground
pits currently being used with steel tanks. The plant owners are currently in
the process of closing the open ground pits.

         Texaco, the plant's operator, received a letter from the EPA dated
July 21, 1991 and a subsequent letter dated June 8, 1992, in which the EPA
requested certain information in order to determine if there had been at the
Aneth Gas Plant the release of hazardous substances to the environment. Texaco
has advised HSW that certain information was supplied to the EPA pursuant to
this request. Subsequently, core samples in and around certain pit areas were
taken by the EPA and Texaco jointly and a Phase II environmental investigation
was undertaken. A closure plan is currently being negotiated with the EPA.

         The prior owner of the Aneth Gas Plant facility, El Paso Natural Gas,
has agreed to accept financial responsibility for a portion of the remediation
work. Texaco and the other current plant owners, including HSW, have entered
into a formal agreement with the prior owner to allocate costs between
remediation work that is mandated by the EPA and other remediation work that is
determined to be carried out by the parties. The prior owner will bear
approximately 86% of the costs of mandated remediation as well as certain other
related expenses. The prior owner will not be responsible for other remediation
work that does not fall within the mandated category. At this time, however, it
is impossible for HSW to accurately estimate the costs of the cleanup at the
Aneth Gas Plant facility or the amount of such total costs the indemnification
from the prior owner will cover for the mandated remediation work. Harken has
accrued a contingency reserve of $239,000 at June 30, 1997 for management's
best estimate of its share of remediation expenditures.

         Harken has accrued approximately $1,269,000 at June 30, 1997 relating
to other operational or regulatory contingent liabilities related to Harken's
domestic operations. Harken and its subsidiaries currently are involved in
various lawsuits and other contingencies, including the guarantee of certain
lease obligations of a former subsidiary, which in management's opinion, will
not result in significant loss exposure to Harken.

         Search Acquisition Corp., a wholly-owned subsidiary of Harken, has
been named as a defendant in a lawsuit by certain parties. On February 28,
1996, the court granted Search Acquisition's motion for summary judgment.
Petrochemical has appealed the decision of the trial court to the Texas Fifth
District Court of Appeals. Although the ultimate outcome of this litigation is
uncertain, Harken believes that any liability to Harken as a result of this
litigation will not have a material adverse effect on Harken's financial
condition.

         The exploration, development and production of oil and gas are subject
to various Navajo, federal and state laws and regulations designed to protect
the environment. Compliance with these regulations is part of Harken's
day-to-day operating procedures. Infrequently, accidental discharge of such
materials as oil, natural gas or drilling fluids can occur and such accidents
can require material expenditures to correct. Harken maintains levels of
insurance customary in the industry to limit its financial exposure. Management
is unaware of any material capital expenditures required for environmental
control during the next fiscal year.




                                       17

<PAGE>   18



                ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                                  (UNAUDITED)

         Certain statements included in the accompanying condensed financial
statements and in the following discussion and analysis of financial condition
and results of operation, including statements of Harken management's current
expectations, intentions, plans and beliefs, are forward-looking statements, as
defined in Section 21D of the Securities Exchange Act of 1934, and are
dependent on certain events, risks and uncertainties that may be outside of
Harken's control. These forward-looking statements include statements of
management's plans and objectives for Harken's future operations and statements
of future economic performance, information regarding Colombian drilling
schedules, expected or planned production capabilities, Harken's capital budget
and future capital expenditures and the sufficiency and availability of capital
resources needed to fund such future capital expenditures. Actual results and
developments could differ materially from those expressed in or implied by such
statements due to a number of factors, including general economic conditions;
the timing of environmental and other necessary administrative permits; the
impact of the activities of OPEC and other competitors; the impact of possible
geopolitical occurrences world-wide; the results of financing efforts; changes
in laws and regulations; capacity, deliverability and supply constraints or
difficulties; unforeseen engineering and mechanical or technological
difficulties in drilling or working over wells; and other risks described in
Harken's filings with the Securities and Exchange Commission.

OVERVIEW

         Harken reported net income for the six months ended June 30, 1997 of
$114,000 compared to a net loss of $228,000 for the prior year period. Total
revenues increased from approximately $4.9 million during the six months ended
June 30, 1996 to approximately $8.3 million for the same period in 1997,
primarily due to an acquisition consummated in July 1996 that increased
Harken's producing properties and oil and gas reserves. Gross profit before
depreciation and amortization, general and administrative and interest expenses
totaled approximately $5.8 million during the six months ended June 30, 1997
compared to approximately $3.3 million for the prior year period. Harken
expects that its monthly operating revenues, expenses and gross profit from oil
and gas operations will remain at current levels during the remainder of 1997
and until such time as it commences production from its Colombian operations.

         Internationally, Harken announced in March 1997 that the initial
production testing of the Ubaque formation of the Estero #1 well within the
Palo Blanco prospect of the Alcaravan Contract area which was drilled during
the first quarter of 1997, produced with an electric submersible pump,
indicated a rate of 4,116 barrels of oil per day. This production rate was
limited by the capacity of the submersible pump and surface storage facilities
at the location. In addition, in late April 1997, Harken began drilling
operations on the Torcaz #3 well, located on the Rio Negro prospect of the
Bocachico Contract. Harken announced in July 1997 that the drilling and initial
production testing of the Torcaz #3 well had been completed, with the well
being drilled to a depth of 8,225 feet and on initial tests the well produced
at a rate of 643 barrels per day.

                             RESULTS OF OPERATIONS

         The following is management's discussion and analysis of certain
significant factors which have affected Harken's earnings and balance sheet
during the periods included in the accompanying consolidated financial
statements.



                                       18

<PAGE>   19




<TABLE>
<CAPTION>
                                          THREE MONTHS ENDED                             SIX MONTHS ENDED
                                               JUNE 30,                                       JUNE 30,
                                 ---------------------------------------      -----------------------------------------
                                       1996                  1997                   1996                    1997
                                 ----------------      -----------------      -----------------      ------------------
<S>                              <C>                   <C>                   <C>                      <C>              
        EXPLORATION AND                                           (UNAUDITED)
          PRODUCTION
          OPERATIONS

REVENUES
  Oil sales revenues             $      1,496,000      $       1,975,000     $         2,830,000      $       4,135,000
     Oil volumes in barrels                72,000                106,000                 144,000                206,000
     Oil price per barrel        $          20.78      $           18.63     $             19.65      $           20.07
  Gas sales revenues             $        674,000      $       1,037,000     $         1,146,000      $       2,344,000
     Gas volumes in mcf                   274,000                474,000                 490,000                868,000
     Gas price per mcf           $           2.46      $            2.19     $              2.34      $            2.70
  Gas plant revenues             $        218,000      $         152,000     $           409,000      $         365,000

OTHER REVENUES
  Interest Income                $        202,000      $         854,000     $           385,000      $       1,414,000
  Other Income                   $             --      $           9,000     $           161,000      $          20,000
</TABLE>

For the quarter ended June 30, 1997 compared with the corresponding prior
period.

DOMESTIC OPERATIONS

         Gross oil and gas revenues during the second quarter of 1996 and 1997
were generated by Harken's domestic exploration and production operations.
During the second quarter of 1997 these domestic operations consisted primarily
of the operations in the Four Corners area of Utah, Arizona and New Mexico,
primarily on the Navajo Indian Reservation (the "Four Corners Properties"),
onshore South Texas, and in the Western and Panhandle regions of Texas, as well
as Harken's operations in the Magnolia region of Arkansas and the Carlsbad
region of New Mexico, which were acquired as part of the EnerVest Property
purchase in July 1996.

         Gross oil revenues increased 32% to $1,975,000 during the second
quarter of 1997 compared to $1,496,000 during the second quarter of 1996
primarily due to the additional production volumes added as a result of the
acquisition of the EnerVest Properties which contributed approximately $779,000
to second quarter 1997 oil revenues. This increase in oil revenues during the
second quarter of 1997 was partially offset by lower prices received per barrel
of oil during the quarter of $18.63 per barrel compared to $20.78 received
during the second quarter of 1996.

         Gross gas revenues increased 54% to $1,037,000 for the three months
ended June 30, 1997 compared to $674,000 for the prior year period, due
primarily to the acquisition of the EnerVest Properties consummated in July
1996. The EnerVest Properties contributed approximately $277,000 to second
quarter




                                       19

<PAGE>   20



1997 gas revenues. Harken received a price per mcf of $2.19 during the second
quarter of 1997 compared to $2.46 received per mcf during the prior year
period. Gas produced from the Panhandle Properties, with its associated
products, represented 18% of second quarter 1997 gas production and is sold at
approximately a 60% premium to posted gas prices in the region as a result of
the high BTU content of such gas.

         Oil and gas operating expenses consist of lease operating expenses and
gas plant expenses, along with a number of production and reserve based taxes,
including severance taxes, property taxes, Utah conservation taxes and Navajo
severance and possessory interest taxes. The increase in oil and gas operating
expenses during the second quarter of 1997 compared to the prior year period is
primarily a result of the acquisition of the EnerVest Properties, which added
approximately $288,000 to second quarter 1997 oil and gas operating expenses.

INTEREST AND OTHER INCOME

         Interest and other income increased during the second quarter of 1997
compared to the prior period due to the inclusion during 1997 of approximately
$492,000 of interest income earned by Harken on proceeds received from the June
1997 issuance of $70 million of 5 1/2% European Notes and the July 1996
issuance of $40 million of 6 1/2% European Notes. Such proceeds, net of
European Notes issuance costs and amounts released and transferred, are
initially maintained and invested in separate interest bearing bank accounts
(the "Segregated Accounts").

OTHER COSTS AND EXPENSES

         General and administrative expenses increased from $980,000 for the
second quarter of 1996 to $1,166,000 for the second quarter of 1997, primarily
as a result of increased personnel and office costs associated with the
increased overall operations as well as increased corporate costs. However,
second quarter 1997 general and administrative expenses decreased as a
percentage of oil and gas revenues as compared to the prior year.

         Depreciation and amortization expense increased during the second
quarter of 1997 compared to the prior year period consistent with the increased
production levels from the acquired oil and gas property interests during 1996.
Depreciation and amortization on oil and gas properties is calculated on a unit
of production basis in accordance with the full cost method of accounting for
oil and gas properties.

         Interest expense and other increased during the second quarter of 1997
compared to the prior year period due to the June 1997 issuance of the 5 1/2%
European Notes and the July 1996 issuance of the 6 1/2% European Notes, which
together generated interest expense of approximately $247,000 net of amounts of
interest capitalized, and approximately $81,000 of net amortization of related
issuance costs. Such amounts were greater than the corresponding costs in 1996
associated with the 8% European Notes.

For the six months ended June 30, 1997 compared with the corresponding prior
period.

         Gross oil revenues increased 46% to $4,135,000 during the first six
months of 1997 compared to $2,830,000 during the first six months of 1996
primarily due to the additional production volumes added as a result of the
acquisition of the EnerVest Properties which contributed approximately
$1,585,000 to 1997 oil revenues, and which was partially offset by normal
production declines on Harken's existing properties.




                                       20

<PAGE>   21



In addition, Harken benefited from the overall higher prices received per
barrel of oil, receiving an average of $20.07 per barrel compared to $19.65
from the prior year period.

         Gross gas revenues increased 105% to $2,344,000 for the six months
ended June 30, 1997 compared to $1,146,000 for the prior year period, again due
primarily to the acquisition of the EnerVest Properties consummated in July
1996. The EnerVest Properties contributed approximately $622,000 to 1997 gas
revenues. In addition, Harken received an overall average price per mcf of
$2.70 per mcf of gas production during the first six months of 1997 compared to
$2.34 per mcf received during the first half of 1996. Harken also reflected
increased gas production volumes from its South Texas properties during the
first six months of 1997 due to the successful completion of new gas wells
drilled during late 1996 and early 1997.

         Oil and gas operating expenses consist of lease operating expenses and
gas plant expenses, along with a number of production and reserve based taxes,
including severance taxes, property taxes, Utah conservation taxes and Navajo
severance and possessory interest taxes. The increase in oil and gas operating
expenses compared to the prior year period is primarily a result of the above
mentioned acquisitions of the EnerVest Properties, which added approximately
$538,000 to the first six months of 1997 oil and gas operating expenses. The
first six months of 1997 oil and gas operating expenses remained flat, however,
as a percentage of oil and gas revenues as compared to the prior year period.

INTEREST AND OTHER INCOME

         Interest and other income increased during the first six months of
1997 compared to the prior period due to the inclusion during 1997 of
approximately $905,000 of interest income earned by Harken on proceeds received
from the June 1997 issuance of $70 million of 5 1/2% European Notes and the
July 1996 issuance of $40 million of 6 1/2% European Notes. Such proceeds, net
of European Notes issuance costs and amounts released and transferred, are
initially maintained and invested in separate interest bearing bank accounts
(the "Segregated Accounts").

OTHER COSTS AND EXPENSES

         General and administrative expenses increased from $1,797,000 for the
first six months of 1996 to $2,500,000 for the first six months of 1997,
primarily as a result of increased personnel and office costs associated with
the increased overall operations as well as increased corporate costs. However,
the first six months of 1997 general and administrative expenses decreased as a
percentage of oil and gas revenues as compared to the prior year.

         Depreciation and amortization expense increased during the first six
months of 1997 compared to the prior year period consistent with the increased
production levels from the acquired oil and gas property interests during 1996.
Depreciation and amortization on oil and gas properties is calculated on a unit
of production basis in accordance with the full cost method of accounting for
oil and gas properties.

         Interest expense and other increased during the first half of 1997
compared to the prior year period due to the June 1997 issuance of the 5 1/2%
European Notes and the July 1996 issuance of the 6 1/2% European Notes, which
together generated interest expense of approximately $599,000 net of amounts of
interest capitalized, and approximately $247,000 of net amortization of related
issuance costs. Such amounts were greater than the corresponding costs in 1996
associated with the 8% European Notes.




                                       21

<PAGE>   22



                        LIQUIDITY AND CAPITAL RESOURCES

         Harken's working capital increased to approximately $105.3 million at
June 30, 1997 from $43.8 million at December 31, 1996, primarily due to the
June 11, 1997 issuance of 5 1/2% European Notes (see discussion below) which
generated net available proceeds of approximately $65 million which are
classified as a current asset.

         During the six months ended June 30, 1997, Harken's cash and temporary
investments increased approximately $12.8 million consisting primarily of
transfers from the 6 1/2% European Notes Segregated Accounts of approximately
$15.3 million following the conversions of a portion of the 6 1/2% European
Notes to Common Stock, proceeds from the exercise of outstanding options and
warrants of approximately $2.2 million, and advances received pursuant to the
Palo Blanco Development Finance Agreement, Parkcrest Agreement and Rochester
Agreement of approximately $3.8 million. Such activity was sufficient to fund
capital expenditures of approximately $11.1 million. Cash flow provided by
operations during the first six months of 1997 totaled approximately $2.6
million.

         Harken believes that cash flow from operations will be sufficient to
meet its operating cash requirements in 1997. Harken includes in cash and
temporary investments certain balances which are restricted to use for specific
project expenditures, collateral or for distribution to outside interest owners
and are not available for general working capital purposes.

         On June 11, 1997, Harken issued to qualified purchasers a total of $70
million in 5 1/2% Senior Convertible Notes (the "5 1/2% European Notes") which
mature on June 10, 2002. In connection with the sale and issuance of the 5 1/2%
European Notes, Harken paid approximately $5,174,000 from the 5 1/2% European
Notes proceeds for commission and issuance costs. Interest incurred on these
notes is payable semi-annually in June and December of each year to maturity or
until the 5 1/2% European Notes are converted. Such 5 1/2% European Notes are
convertible into shares of Harken common stock at an initial conversion price
of $5.00 per share, subject to adjustment in certain circumstances ("the 5 1/2
% European Note Conversion Price"). A five percent premium on the number of
shares of Harken common stock issuable on conversion will be payable to holders
converting the 5 1/2% European Notes prior to December 11, 1997. The 5 1/2%
European Notes are also convertible by Harken into shares of Harken common
stock after one year following issuance, if for any period of thirty
consecutive days commencing on or after June 11, 1997, the average of the
closing prices of Harken common stock for each trading day during such thirty
day period shall have equaled or exceeded 130% of the 5 1/2% European Note
Conversion Price (or $6.50 per share of Harken common stock). All proceeds from
the sale of the 5 1/2% European Notes were initially paid at closing to a
Trustee pursuant to a Trust Indenture and held in Segregated Accounts to be
maintained for Harken's benefit.

         Until the 5 1/2% European Notes mature or are converted, the Trust
Indenture under which the 5 1/2% European Notes were issued requires Harken to
maintain an Asset Value Coverage Ratio, as defined in the Trust Indenture. For
a detailed discussion of the 5 1/2% European Notes see "Notes to Consolidated
Financial Statements, Note 5 -- European Convertible Notes Payable." As of June
30, 1997, Harken was in compliance with the Asset Value Coverage Ratio test and
the full amount of net proceeds of the offering (approximately $65 million) was
available.

         In order for a specific amount of proceeds to be released from the
Segregated Accounts, Harken must demonstrate that the Asset Value Coverage
Ratio test would continue to be met after such release of funds and that no
Event of Default with respect to the 5 1/2% European Notes has occurred and is
continuing at the




                                       22

<PAGE>   23



date of such release. Such request must be accompanied by an independent
reserve engineering report or other independent third party valuation of
Harken's unencumbered proved developed producing assets.

         The anticipated timing at which funds will be released from the
Segregated Accounts is dependent upon the timing and magnitude of conversions
into Common Stock by the individual noteholders and the amount of Harken's
assets which qualify for inclusion in the Asset Value Coverage Ratio test. Once
an amount of proceeds are available to be released from the Segregated
Accounts, Harken may submit its request for the transfer of such proceeds at
its discretion and according to its capital resource requirements.

         To the extent that proceeds invested in the Segregated Accounts at the
balance sheet date are available under the above Asset Value Coverage Ratio
limitations, such cash is included as a current asset as it is available to
Harken to fund international and domestic activities including acquisitions,
drilling costs and other capital expenditures or other working capital needs.
Interest incurred on the 5 1/2% European Notes is payable semi-annually in June
and December of each year to maturity or until the 5 1/2% European Notes are
converted. Interest payments will be funded from cash flow from operations,
existing cash balances or from available proceeds in the Segregated Accounts.

         In February 1997, Harken gave notice as required under the Trust
Indenture that it had met the market price criteria necessary to call for
mandatory conversion of the 6 1/2% European Notes. During the first six months
of 1997, holders of 6 1/2% European Notes totaling $19,300,000 exercised their
conversion option and such holders were issued 7,720,000 shares of Harken
common stock. In March 1997, Harken transferred approximately $15.3 million of
6 1/2% European Note proceeds from the Segregated Accounts to Harken's
operating cash account as a result of these conversions. On July 31, 1997,
Harken converted the remaining 6 1/2% European Notes into shares of Harken
common stock and transferred the remaining 6 1/2% European Note proceeds of
approximately $21.2 million from the Segregated Accounts to Harken's operating
cash account.

         Harken's operating strategy includes efforts to find additional
opportunities to acquire domestic oil and gas reserves through domestic
drilling activities and through merger and acquisitions, in exchange for cash,
debt or issuance of Common Stock. In addition to Harken's efforts to develop
and acquire domestic oil and gas reserves, Harken continues to be very active
in exploration efforts internationally, particularly in Colombia. As of June
30, 1997, Harken's net investment in its Colombian operations has totaled
approximately $20.4 million. Terms of each of the Association Contracts entered
into between Harken de Colombia, Ltd. and Ecopetrol commit Harken to perform
certain activities in accordance with a prescribed timetable. Failure by Harken
to perform these activities as required could result in Harken losing its
rights under the particular Association Contract, which could potentially have
a material adverse effect on Harken's business. For a detailed discussion of
each of the Association Contracts entered into between Harken de Colombia, Ltd.
and Ecopetrol, see "Notes to Consolidated Financial Statements, Note 4--
Colombian Operations."

         Capital expenditures related to Harken's Colombian operations are
expected to total a minimum of approximately $35 million before potential
partner contributions during 1997, including a minimum of approximately $16
million related to total operations commitments required under Harken's
Association Contracts. Harken anticipates that it will have sufficient cash
available to fund all of its planned activities in Colombia for 1997. In June
1997, Harken announced its plans to drill a three well exploratory program in
the Bolivar Contract area. Harken expects the drilling of the three horizontal
wells will require



                                       23

<PAGE>   24



approximately $20 million, with Harken retaining 100% ownership in these wells.
This amount is included in Harken's total capital expenditure plans for 1997
and 1998.

         Harken anticipates that full development of Colombian reserves in the
Alcaravan contract area of the Llanos Basin and the Bocachico, Cambulos and
Bolivar contract areas of the Middle Magdalena Basin will take several years
and may also require extensive production facilities which would require
significant additional capital expenditures. The ultimate amount of such
expenditures cannot be presently predicted. Harken anticipates that amounts
required to fund its Colombian activities, including the above mentioned
exploration programs and additional development expenditures, will be funded
from existing cash balances, asset sales, the proceeds from the European Notes,
future stock issuances, production payments, operating cash flows and from
industry partners; however, there can be no assurances that Harken will have
adequate funds available to it to fund all of its Colombian activities or that
industry partners can be obtained to fund a portion of such Colombian
activities.

         Domestically, Harken plans to continue development of proved
undeveloped reserves on properties with minimal development risk in addition to
a continual workover program on producing properties. Harken expects such costs
to total approximately $7 million in 1997. The targeted results of these
efforts are to increase domestic production and cash flows during 1997. Harken
expects that its increased domestic efforts will be completed with planned
increases of approximately 20% in general and administrative expenses for 1997
compared to the level of such expenses reflected during the year ended December
31, 1996.

         The exploration, development and production of oil and gas are subject
to various Navajo, federal, state and local laws and regulations designed to
protect the environment. Compliance with these regulations is part of Harken's
day-to-day operating procedures. Infrequently, accidental discharge of such
materials as oil, natural gas or drilling fluids can occur and such accidents
can require material expenditures to correct. Harken maintains levels of
insurance customary in the industry to limit its financial exposure. Management
is unaware of any material capital expenditures required for environmental
control during the next fiscal year.

         Harken has accrued approximately $1.5 million at June 30, 1997
relating to operational or regulatory contingent liabilities related to
Harken's domestic operations. Harken and its subsidiaries currently are
involved in various lawsuits and other contingencies, including a certain
lawsuit and the guarantee of certain lease obligations of a former subsidiary,
which in management's opinion, will not result in significant loss exposure to
Harken.



                                       24

<PAGE>   25



                          PART II - OTHER INFORMATION

Item 1.    Legal Proceedings.

           Search Acquisition Corp. ("Search Acquisition"), a wholly-owned
           subsidiary of Harken, has been named as a defendant in a lawsuit by
           Petrochemical Corporation of America and Lorken Investments
           Corporation (together, "Petrochemical"). This lawsuit arises out of
           an attempt by Petrochemical to enforce a judgment entered in 1993
           against, among other parties, a group of 20 limited partnerships
           known as the "Odyssey limited partnerships". In 1989, Search
           Exploration, Inc. ("Search") acquired all of the assets of eight of
           the 20 Odyssey limited partnerships. Petrochemical claims that
           Search is liable for payment of the judgment as the
           successor-in-interest to the eight Odyssey limited partnerships.
           Search Acquisition was the surviving corporation in the merger with
           Search.

           On February 28, 1996, the court granted Search Acquisition's motion
           for summary judgment. Petrochemical has appealed the decision of the
           trial court. Although the ultimate outcome of this litigation is
           uncertain, Harken believes that any liability to Harken as a result
           of this litigation will not have a material adverse effect on
           Harken's financial condition.

Item 2.    Changes in Securities.
           Not applicable.

Item 3.    Default Upon Senior Securities.
           Not applicable.

Item 4.    Submission of Matters to a Vote of Securities Holders.
           On June 9, 1997, Harken held it Annual Meeting of Stockholders. The
           stockholders of Harken voted on the election of Directors, the
           results of which are described below:

<TABLE>
<CAPTION>
                                            For        Against       Abstain
                                            ---        -------       -------
<S>                                      <C>           <C>          <C>      
                 Mikel D. Faulkner       82,010,205       -         6,600,445
                 Bruce N. Huff           82,010,205       -         6,600,445
</TABLE>

Item 5.    Other Information
           Not applicable.

Item 6.    Exhibits and Reports on Form 8-K.

       (a) EXHIBIT INDEX
           Exhibit

            3.1         Certificate of Incorporation of Harken Energy
                        Corporation as amended (filed as Exhibit 3.1 to
                        Harken's Annual Report on Form 10-K for fiscal year
                        ended December 31,1989, File No. 0-9207, and
                        incorporated by reference herein).




                                       25

<PAGE>   26



            3.2         Amendment to the Certificate of Incorporation of Harken
                        Energy Corporation (filed as Exhibit 28.8 to the
                        Registration Statement on Form S-1 of Tejas Power
                        Corporation, file No. 33-37141, and incorporated by
                        reference herein.)

            3.3         Amendment to the Certificate of Incorporation of Harken
                        Energy Corporation (filed as Exhibit 3 to Harken's
                        Quarterly Report on Form 10-Q for fiscal quarter ended
                        March 31, 1991, File No. 0-9207, and incorporated by
                        reference herein.)

            3.4         Amendments to the Certificate of Incorporation of
                        Harken Energy Corporation (filed as Exhibit 3 to
                        Harken's Quarterly Report on Form 10-Q for fiscal
                        quarter ended June 30, 1991, File No. 0-9207, and
                        incorporated by reference herein.)

            3.5         Amendments to the Certificate of Incorporation of
                        Harken Energy Corporation (filed as Exhibit 3.5 to
                        Harken's Annual Report on Form 10-K for fiscal year
                        ended December 31, 1996, File No. 0-9207, and
                        incorporated by reference herein.).

            3.6         Bylaws of Harken Energy Corporation, as amended (filed
                        as Exhibit 3.2 to Harken's Annual Report on Form 10-K
                        for fiscal year ended December 31, 1989, File No.
                        0-9207, and incorporated by reference herein.)

            4.1         Form of certificate representing shares of Harken
                        common stock, par value $.01 per share (filed as
                        Exhibit 1 to Harken's Registration Statement on Form
                        8-A, File No. 0-9027, and incorporated by reference
                        herein.)

            4.2         Certificate of Designations, Powers, Preferences and
                        Rights of Series A Cumulative Convertible Preferred
                        Stock, $1.00 par value, of Harken Energy Corporation
                        (filed as Exhibit 4.1 to Harken's Annual Report on Form
                        10-K for the fiscal year ended December 31, 1989, File
                        No. 0-9207, and incorporated by reference herein).

            4.3         Certificate of Designations, Powers, Preferences and
                        Rights of Series B Cumulative Convertible Preferred
                        Stock, $1.00 par value, of Harken Energy Corporation
                        (filed as Exhibit 4.2 to Harken's Annual Report on Form
                        10-K for the fiscal year ended December 31, 1989, File
                        No. 0-9207, and incorporated by reference herein).

            4.4         Certificate of the Designations, Powers, Preferences
                        and Rights of Series C Cumulative Convertible Preferred
                        Stock, $1.00 par value of Harken Energy Corporation
                        (filed as Exhibit 4.3 to Harken's Annual Report on Form
                        10-K for fiscal year ended December 31, 1989, File No.
                        0-9207, and incorporated by reference herein).

            4.5         Certificate of the Designations of Series D Preferred
                        Stock, $1.00 par value of Harken Energy Corporation
                        (filed as Exhibit 4.3 to Harken's Quarterly Report on
                        Form 10-Q for the fiscal quarter ended September 30,
                        1995, File No. 0-9207, and incorporated by reference
                        herein).

          *10.1         Trust Indenture dated June 11, 1997, by and between
                        Harken and Marine Midland Bank plc.



                                       26

<PAGE>   27



            *10.2       Placing Agreement dated June 3, 1997, by and among
                        Harken and the various signatories thereto.

            *10.3       Global Temporary Note dated June 11, 1997, issued by
                        Harken in the principal amount of $70,000,000.

            *10.4       Drilling Contract dated as of July 22, 1997, between
                        Harken de Colombia, Ltd., and Parker Drilling Company
                        International Ltd.

            *10.5       Drilling Contract dated as of May 15, 1997, between
                        Harken de Colombia, Ltd., and Marlin Colombia Drilling
                        Company, Inc.

            *27         Financial Data Schedules.

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

* filed herewith

       (b) REPORTS ON FORM 8-K.
           On June 11, 1997 Harken filed a Current Report on Form 8-K (Item 5)
           to report the issuance of the 5 1/2% European Notes.




                                       27

<PAGE>   28
                           HARKEN ENERGY CORPORATION

                                   SIGNATURES




Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.






                                            Harken Energy Corporation
                                       ----------------------------------------
                                                    (Registrant)





Date:     August 11,1997           By:  /s/ Bruce N. Huff
                                       ----------------------------------------
                                       Bruce N. Huff, Senior Vice President and
                                               Chief Financial Officer





                                       28


<PAGE>   29

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
         EXHIBIT 
         NUMBER          DESCRIPTION
         ------          -----------
<S>         <C>                                                      
            3.1         Certificate of Incorporation of Harken Energy
                        Corporation as amended (filed as Exhibit 3.1 to
                        Harken's Annual Report on Form 10-K for fiscal year
                        ended December 31,1989, File No. 0-9207, and
                        incorporated by reference herein).

            3.2         Amendment to the Certificate of Incorporation of Harken
                        Energy Corporation (filed as Exhibit 28.8 to the
                        Registration Statement on Form S-1 of Tejas Power
                        Corporation, file No. 33-37141, and incorporated by
                        reference herein.)

            3.3         Amendment to the Certificate of Incorporation of Harken
                        Energy Corporation (filed as Exhibit 3 to Harken's
                        Quarterly Report on Form 10-Q for fiscal quarter ended
                        March 31, 1991, File No. 0-9207, and incorporated by
                        reference herein.)

            3.4         Amendments to the Certificate of Incorporation of
                        Harken Energy Corporation (filed as Exhibit 3 to
                        Harken's Quarterly Report on Form 10-Q for fiscal
                        quarter ended June 30, 1991, File No. 0-9207, and
                        incorporated by reference herein.)

            3.5         Amendments to the Certificate of Incorporation of
                        Harken Energy Corporation (filed as Exhibit 3.5 to
                        Harken's Annual Report on Form 10-K for fiscal year
                        ended December 31, 1996, File No. 0-9207, and
                        incorporated by reference herein.).

            3.6         Bylaws of Harken Energy Corporation, as amended (filed
                        as Exhibit 3.2 to Harken's Annual Report on Form 10-K
                        for fiscal year ended December 31, 1989, File No.
                        0-9207, and incorporated by reference herein.)

            4.1         Form of certificate representing shares of Harken
                        common stock, par value $.01 per share (filed as
                        Exhibit 1 to Harken's Registration Statement on Form
                        8-A, File No. 0-9027, and incorporated by reference
                        herein.)

            4.2         Certificate of Designations, Powers, Preferences and
                        Rights of Series A Cumulative Convertible Preferred
                        Stock, $1.00 par value, of Harken Energy Corporation
                        (filed as Exhibit 4.1 to Harken's Annual Report on Form
                        10-K for the fiscal year ended December 31, 1989, File
                        No. 0-9207, and incorporated by reference herein).

            4.3         Certificate of Designations, Powers, Preferences and
                        Rights of Series B Cumulative Convertible Preferred
                        Stock, $1.00 par value, of Harken Energy Corporation
                        (filed as Exhibit 4.2 to Harken's Annual Report on Form
                        10-K for the fiscal year ended December 31, 1989, File
                        No. 0-9207, and incorporated by reference herein).

            4.4         Certificate of the Designations, Powers, Preferences
                        and Rights of Series C Cumulative Convertible Preferred
                        Stock, $1.00 par value of Harken Energy Corporation
                        (filed as Exhibit 4.3 to Harken's Annual Report on Form
                        10-K for fiscal year ended December 31, 1989, File No.
                        0-9207, and incorporated by reference herein).

            4.5         Certificate of the Designations of Series D Preferred
                        Stock, $1.00 par value of Harken Energy Corporation
                        (filed as Exhibit 4.3 to Harken's Quarterly Report on
                        Form 10-Q for the fiscal quarter ended September 30,
                        1995, File No. 0-9207, and incorporated by reference
                        herein).

          *10.1         Trust Indenture dated June 11, 1997, by and between
                        Harken and Marine Midland Bank plc.

          *10.2         Placing Agreement dated June 3, 1997, by and among
                        Harken and the various signatories thereto.

          *10.3         Global Temporary Note dated June 11, 1997, issued by
                        Harken in the principal amount of $70,000,000.

          *10.4         Drilling Contract dated as of July 22, 1997, between
                        Harken de Colombia, Ltd., and Parker Drilling Company
                        International Ltd.

          *10.5         Drilling Contract dated as of May 15, 1997, between
                        Harken de Colombia, Ltd., and Marlin Colombia Drilling
                        Company, Inc.

          *27           Financial Data Schedules.
</TABLE>

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

* filed herewith



<PAGE>   1
                                                                 EXHIBIT 10.1


                           HARKEN ENERGY CORPORATION


                                U.S. $70,000,000


                     5.5% Senior Convertible Notes Due 2002


                                TRUST INDENTURE


                                 June 11, 1997
<PAGE>   2
                               TABLE OF CONTENTS


                                  ARTICLE ONE

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

<TABLE>
<CAPTION>                                                        

                                                                                                             Page
                                                                                                             ----
         <S>                                                                                                   <C>
         SECTION 1.01             Definitions                                                                  1

                 Act                                                                                           1
                 Affiliate                                                                                     1
                 Agent Members                                                                                 1
                 Alternative Stock Exchange                                                                    2
                 AMEX                                                                                          2
                 Asset Value Coverage Ratio                                                                    2
                 Authenticating Agent                                                                          2
                 Authorized Newspapers                                                                         2
                 Board of Directors                                                                            2
                 Board Resolution                                                                              2
                 Business Day                                                                                  2
                 Capital Stock                                                                                 2
                 Capitalized Lease Obligation                                                                  3
                 Cedel                                                                                         3
                 Certificate of Incorporation                                                                  3
                 Change of Control                                                                             3
                 Closing Date                                                                                  3
                 Commission                                                                                    3
                 Common Depository                                                                             3
                 Common Stock                                                                                  4
                 Company                                                                                       4
                 Company Request or Company Order                                                              4
                 Conversion Agent                                                                              4
                 Conversion Date                                                                               4
                 Conversion Price                                                                              4
                 Conversion Right                                                                              4
                 Conversion Shares                                                                             4
                 Corporate Trust Office                                                                        4
                 Corporation                                                                                   4
                 Coupon                                                                                        5
                 Couponholder                                                                                  5
                 Default                                                                                       5
                 Designated Oil and Gas Reserves                                                               5
                 Euroclear                                                                                     5
</TABLE>

                                      1
<PAGE>   3
<TABLE>
                 <S>                                                                                          <C>
                 Event of Default                                                                              5
                 Exchange Act                                                                                  5
                 Extraordinary Resolution                                                                      5
                 Federal Bankruptcy Code                                                                       5
                 Generally Accepted Accounting Principles                                                      5
                 Good Title                                                                                    5
                 Group                                                                                         5
                 Guaranty                                                                                      5
                 Holder                                                                                        6
                 Hydrocarbon Interests                                                                         6
                 Hydrocarbons                                                                                  6
                 Indebtedness                                                                                  6
                 Indenture                                                                                     7
                 Independent Reserve Report                                                                    7
                 Interest Payment Date                                                                         7
                 Lien                                                                                          7
                 Luxembourg Paying Agent and Luxembourg Conversion Agent                                       7
                 Mandatory Conversion                                                                          8
                 Mandatory Conversion Date                                                                     8
                 Market Price                                                                                  8
                 Marketable Securities                                                                         8
                 Maturity                                                                                      8
                 Noteholder                                                                                    8
                 Notes                                                                                         8
                 Offering Circular                                                                             8
                 Officers' Certificate                                                                         8
                 Oil and Gas Properties                                                                        8
                 Opinion of Counsel                                                                            9
                 Outstanding                                                                                   9
                 Paying Agent                                                                                  9
                 Permitted Investments                                                                         9
                 Person                                                                                       10
                 Predecessor Note                                                                             10
                 Preferred Stock                                                                              11
                 Presentation Date                                                                            11
                 Principal Paying and Conversion Agent                                                        11
                 Principal Subsidiary                                                                         11
                 Property                                                                                     11
                 Proved Columbian Reserves                                                                    11
                 Proved U.S. Reserves                                                                         11
                 Purchase Date                                                                                12
                 Purchase Price                                                                               12
                 Redemption Date                                                                              12
                 Redemption Price                                                                             12
                 Regulation S                                                                                 12
</TABLE>





                                       2
<PAGE>   4
<TABLE>
         <S>                                                                                                  <C>
                 Relevant Date                                                                                12
                 Required Assets                                                                              12
                 Responsible Officer                                                                          12
                 Restricted Period                                                                            12
                 SEC Value                                                                                    12
                 Securities Act                                                                               12
                 Segregated Account                                                                           13
                 Shares                                                                                       13
                 Stated Maturity                                                                              13
                 Stock Exchange Business Day                                                                  13
                 Subordinated Obligation                                                                      13
                 Subsidiary                                                                                   13
                 Trustee                                                                                      13
                 Unexercised Note                                                                             13
                 U.S. Government Obligations                                                                  13
                 U.S. Person                                                                                  14
                 Vice President                                                                               14
                 Voting Stock                                                                                 14

         SECTION 1.02             Other Definitions                                                           14
         SECTION 1.03             Rules of Construction                                                       14
         SECTION 1.04             Compliance Certificates and Opinions                                        15
         SECTION 1.05             Form of Documents Delivered to Trustee                                      16
         SECTION 1.06             Acts of Noteholders                                                         16
         SECTION 1.07             Notices, Etc., to Trustee and Company                                       17
         SECTION 1.08             Notices to Noteholders; Waiver                                              18
         SECTION 1.09             Effect of Headings and Table of Contents                                    18
         SECTION 1.10             Successors and Assigns                                                      18
         SECTION 1.11             Separability Clause                                                         18
         SECTION 1.12             Benefits of Indenture                                                       18
         SECTION 1.13             Governing Law                                                               19
         SECTION 1.14             Legal Holidays                                                              19


                                                  ARTICLE TWO

                                               FORMS OF THE NOTES

         SECTION 2.01             Forms Generally                                                             19
         SECTION 2.02             Restrictive Legends                                                         20
</TABLE>





                                       3
<PAGE>   5
<TABLE>
         <S>                      <C>                                                                         <C>
                                                  ARTICLE THREE

                                                    THE NOTES

         SECTION 3.01             Terms                                                                       21
         SECTION 3.02             Denominations                                                               22
         SECTION 3.03             Execution, Authentication, Delivery and Dating                              22
         SECTION 3.04             Temporary Notes                                                             23
         SECTION 3.05             Exchange                                                                    23
         SECTION 3.06             Book-Entry Provisions for Global Note                                       24
         SECTION 3.07             Special Transfer Provisions                                                 26
         SECTION 3.08             Mutilated, Destroyed, Lost and Stolen Notes                                 26
         SECTION 3.09             Payment of Interest; Interest Rights Preserved                              27
         SECTION 3.10             Persons Deemed Owners                                                       27
         SECTION 3.11             Cancellation                                                                27
         SECTION 3.12             Computation of Interest                                                     28
         SECTION 3.13             ISIN, CUSIP or Other Identifying Numbers                                    28
         SECTION 3.14             Prescription                                                                28


                                                  ARTICLE FOUR

                                           SATISFACTION AND DISCHARGE

         SECTION 4.01             Satisfaction and Discharge of Indenture                                     28
         SECTION 4.02             Application of Trust Money                                                  29


                                                  ARTICLE FIVE

                                         EVENTS OF DEFAULT AND REMEDIES

         SECTION 5.01             Events of Default                                                           30
         SECTION 5.02             Acceleration of Maturity; Rescission and Annulment                          32
         SECTION 5.03             Collection of Indebtedness and Suits for Enforcement
                                  by Trustee                                                                  33
         SECTION 5.04             Trustee May File Proofs of Claim                                            33
         SECTION 5.05             Trustee May Enforce Claims Without Possession of Notes                      34
         SECTION 5.06             Application of Money Collected                                              34
         SECTION 5.07             Limitation on Suits                                                         35
         SECTION 5.08             Unconditional Right of Holders to Receive Principal and
                                  Interest                                                                    35
         SECTION 5.09             Restoration of Rights and Remedies                                          36
         SECTION 5.10             Rights and Remedies Cumulative                                              36
</TABLE>





                                       4
<PAGE>   6
<TABLE>
         <S>                      <C>                                                                         <C>
         SECTION 5.11             Delay or Omission Not Waiver                                                36
         SECTION 5.12             Control by Noteholders                                                      36
         SECTION 5.13             Waiver of Past Defaults                                                     37
         SECTION 5.14             Waiver of Stay or Extension Laws                                            37
         SECTION 5.15             Undertaking for Costs                                                       37


                                                  ARTICLE SIX

                                                  THE TRUSTEE

         SECTION 6.01             Notice of Defaults                                                          38
         SECTION 6.02             Certain Rights of Trustee                                                   38
         SECTION 6.03             Trustee Not Responsible for Recitals or Issuance of Notes                   39
         SECTION 6.04             May Hold Notes                                                              40
         SECTION 6.05             Money Held in Trust                                                         40
         SECTION 6.06             Compensation and Reimbursement                                              40
         SECTION 6.07             Corporate Trustee Required; Eligibility                                     41
         SECTION 6.08             Resignation and Removal; Appointment of Successor                           41
         SECTION 6.09             Acceptance of Appointment by Successor                                      42
         SECTION 6.10             Merger, Conversion, Consolidation or Succession to Business                 43
         SECTION 6.11             Certain Duties and Responsibilities                                         43
         SECTION 6.12             Segregated Account                                                          44
         SECTION 6.13             Meetings of Noteholders                                                     46
         SECTION 6.14             Authenticating Agents                                                       47


                                                      ARTICLE SEVEN

                                        NOTEHOLDERS' LISTS AND REPORTS BY COMPANY

         SECTION 7.01             Disclosure of Names and Addresses of Noteholders                            48
         SECTION 7.02             Reports by Company                                                          49


                                                 ARTICLE EIGHT

                             CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER, OR LEASE

         SECTION 8.01             Company May Consolidate, Etc., Only on Certain Terms                        49
         SECTION 8.02             Successor Substituted                                                       50
</TABLE>





                                       5
<PAGE>   7

<TABLE>
         <S>                      <C>                                                                        <C>
                                                  ARTICLE NINE

                                            SUPPLEMENTAL INDENTURES


         SECTION 9.01             Supplemental Indentures Without Consent of Noteholders                      50
         SECTION 9.02             Supplemental Indentures with Consent of Noteholders                         51
         SECTION 9.03             Execution of Supplemental Indentures                                        52
         SECTION 9.04             Effect of Supplemental Indentures                                           52
         SECTION 9.05             Reference in Notes to Supplemental Indentures                               52
         SECTION 9.06             Notice of Supplemental Indentures                                           53


                                                  ARTICLE TEN

                                                   COVENANTS

         SECTION 10.01            Payment of Principal and Interest                                           53
         SECTION 10.02            Maintenance of Office or Agency                                             53
         SECTION 10.03            Money for Payments to Be Held in Trust                                      54
         SECTION 10.04            Corporate Existence                                                         55
         SECTION 10.05            Payment of Taxes and Other Claims                                           55
         SECTION 10.06            Maintenance of Properties                                                   55
         SECTION 10.07            Insurance                                                                   56
         SECTION 10.08            Statement by Officers as to Default                                         56
         SECTION 10.09            Provision of Financial Statements                                           57
         SECTION 10.10            Limitation on Other Indebtedness                                            57
         SECTION 10.11            Limitation on Liens                                                         57
         SECTION 10.12            Waiver of Certain Covenants                                                 57
         SECTION 10.13            Maintenance of Asset Value Coverage Ratio                                   58
         SECTION 10.14            Restrictions on Charter Amendments                                          58
         SECTION 10.15            United States Withholding and
                                  Reporting Requirements                                                      58
         SECTION 10.16            Maintenance of Listing for Notes and Shares                                 58
         SECTION 10.17            Change of Control                                                           58


                                                 ARTICLE ELEVEN

                                              REDEMPTION OF NOTES

         SECTION 11.01            Right of Redemption                                                         60
         SECTION 11.02            Applicability of Article                                                    60
         SECTION 11.03            Election to Redeem; Notice to Trustee                                       60
         SECTION 11.04            Selection by Trustee of Notes to Be Redeemed                                61
</TABLE>





                                       6
<PAGE>   8
<TABLE>
         <S>                      <C>                                                                         <C>
         SECTION 11.05            Notice of Redemption                                                        61
         SECTION 11.06            Deposit of Redemption Price                                                 62
         SECTION 11.07            Notes Payable on Redemption Date                                            62
         SECTION 11.08            Surrender of Notes                                                          63
         SECTION 11.09            Conversion on Redemption                                                    63


                                                 ARTICLE TWELVE

                                                   CONVERSION

         SECTION 12.01            Conversion Right and Conversion Price                                       64
         SECTION 12.02            Exercise of Conversion Right                                                64
         SECTION 12.03            Calculation of Shares Issued on Conversion and
                                  Fractions of Shares                                                         65
         SECTION 12.04            Adjustment of Conversion Price                                              65
         SECTION 12.05            Notice of Adjustments of Conversion Price                                   70
         SECTION 12.06            Notice of Certain Corporate Action                                          71
         SECTION 12.07            Company to Reserve Common Stock                                             72
         SECTION 12.08            Taxes on Conversions                                                        72
         SECTION 12.09            Cancellation of Converted Bearer Notes                                      72
         SECTION 12.10            Provisions in Case of Reclassification Consolidation,
                                  Merger or Sale of Assets                                                    72
         SECTION 12.11            Mandatory Conversion                                                        73
         SECTION 12.12            Proposed Amendments to Regulation S                                         74


                                                ARTICLE THIRTEEN

                                       DEFEASANCE AND COVENANT DEFEASANCE

         SECTION 13.01            Company's Option to Effect Defeasance or
                                  Covenant Defeasance                                                         74
         SECTION 13.02            Legal Defeasance and Discharge                                              74
         SECTION 13.03            Covenant Defeasance                                                         75
         SECTION 13.04            Conditions to Legal Defeasance or Covenant Defeasance                       75
         SECTION 13.05            Deposited Money and U.S. Government Obligations to
                                  Be Held in Trust; Other Miscellaneous Provisions                            77
         SECTION 13.06            Reinstatement                                                               77
</TABLE>





                                       7
<PAGE>   9
<TABLE>
         <S>                      <C>                                                                         <C>
                                                    ARTICLE FOURTEEN

                                                   SENIORITY OF NOTES

         SECTION 14.01            Seniority of the Notes                                                      78

                                                     ARTICLE FIFTEEN

                                               IMMUNITY OF INCORPORATORS,
                                           STOCKHOLDERS, OFFICERS AND DIRECTORS

         SECTION 15.01            Liability Solely Corporate                                                  78
</TABLE>





                                       8
<PAGE>   10
<TABLE>
<CAPTION>
                                                    EXHIBITS
<S>              <C>
EXHIBIT A        Form of Bearer Notes, Coupons, and Trustee's Certificate of Authentication

EXHIBIT B        Form of Global Note

EXHIBIT C        Form of Certificate from the Company's Chief Financial Officer Transmitting Annual Financial Statements

EXHIBIT D        Form of Certificate from the Company's Chief Financial Officer Regarding Compliance with the Asset
                 Value Coverage Ratio

EXHIBIT E        Form of Notice from Noteholder of Exercise of Conversion Rights

EXHIBIT F        Form of Notice from the Company of Exercise of Mandatory Conversion

EXHIBIT G        Form of Notice from Noteholder of Exercise of Repurchase Right on a Change of Control
</TABLE>





                                       9
<PAGE>   11

         TRUST INDENTURE dated as of June 11, 1997 ("Indenture"), between
HARKEN ENERGY CORPORATION, a corporation duly organized and existing under the
laws of the State of Delaware (herein called the "Company"), and MARINE MIDLAND
BANK, a banking corporation and trust company duly organized and existing under
the laws of the State of New York, as Trustee (herein called the "Trustee").

         WHEREAS:

         The Company has duly authorized the creation of an issue of up to U.S.
$70,000,000 of 5.5% Senior Convertible Notes Due 2002 and the Coupons, if any,
thereto appertaining (collectively, the "Notes") and to provide therefor the
Company has duly authorized the execution and delivery of this Indenture.

         All things necessary have been done to make the Notes, when duly
issued and executed by the Company and authenticated and delivered hereunder,
the valid obligations of the Company and to make this Indenture a valid
agreement of the Company, in accordance with their and its terms.

         The Trustee has agreed to act as trustee under this Indenture on the
terms and conditions set forth herein.

         NOW, THEREFORE, THIS INDENTURE WITNESSETH:

         For and in consideration of the premises and the purchase of the Notes
by the Holders thereof, it is mutually covenanted and agreed, for the equal and
proportionate benefit of all Holders of the Notes, as follows:

                                  ARTICLE ONE

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION


         SECTION 1.01     Definitions.

         "Act," when used with respect to any Noteholder, has the meaning
specified in Section 1.06.

         "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person and the terms "controlling" and "controlled"
have meanings correlative to the foregoing.

         "Agent Members" has the meaning specified in Section 3.06.

                                      1
<PAGE>   12
         "Alternative Stock Exchange" means any other national or regional
stock exchange or quotation service such as NASDAQ National Market System or
any similar quotation service maintained by the National Quotation Bureau or
any successor thereto.

         "AMEX" means The American Stock Exchange, Inc. or any successor
thereto.

         "Asset Value Coverage Ratio" means a ratio of (a) the sum of the value
of the Required Assets to (b) the aggregate principal amount of all Outstanding
Notes, as set forth in Section 10.13.

         "Authenticating Agent" means the Person authorized pursuant to Section
6.14 to act on behalf of the Trustee to authenticate the Notes until a
successor Authenticating Agent shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Authenticating Agent"
shall mean such successor Authenticating Agent.  Pursuant to the terms hereof,
Midland Bank Plc will initially act as the Authenticating Agent.

         "Authorized Newspapers" means the Luxembourg Wort of Luxembourg and
The Financial Times (European Edition) of London, England.  If either such
newspaper shall cease to be published, the Company or the Trustee shall
substitute for it another newspaper in Europe, customarily published at least
once a day for at least five (5) days in each calendar week, of general
circulation.  If, because of temporary suspension of publication or general
circulation of either such newspaper or for any other reason, it is impossible
or, in the opinion of the Company or the Trustee, impracticable to make any
publication of any notice required by this Indenture in the manner herein
provided, such publication or other notice in lieu thereof which is made by the
Company or the Trustee in the exercise of its reasonable discretion shall
constitute a sufficient publication of such notice.

         "Board of Directors" means either the board of directors of the
Company or any duly authorized committee of that board.

         "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and in full force and effect on the date of such
certification, and delivered to the Trustee.

         "Business Day" means each Monday, Tuesday, Wednesday, Thursday and
Friday which is a day on which banking institutions in Luxembourg, the City of
New York, New York, and London, England are not authorized or obliged by law,
regulation or executive order to close.

         "Capital Stock" means, with respect to any Person, any and all shares,
interests, participation or other equivalents (however designated) of such
Person's capital stock whether now outstanding or issued on or after the date
of this Indenture, including, without limitation, all Common Stock and
Preferred Stock.





                                       2
<PAGE>   13
         "Capitalized Lease Obligation" means the amount of the liability under
any capital lease that, in accordance with GAAP, is required to be capitalized
and reflected as a liability on the balance sheet of the relevant Person.

         "Cedel" means Cedel Bank, societe anonyme.

         "Certificate of Incorporation" means the Certificate of Incorporation
of the Company, as in effect on the date hereof and as amended or restated from
time to time hereafter.

         "Change of Control" means (i) any sale, lease or other transfer of 
(other than the incurrence of a Lien on) all or substantially all of the assets
of the Company to any Person as an entirety or substantially as an entirety in
one transaction or a series of related transactions; (ii) the consolidation or
merger of the Company with or into another Person pursuant to a transaction in
which the outstanding Voting Stock of the Company is changed into or exchanged
for cash, securities or other Property, other than any such transaction where
(a) the outstanding Voting Stock of the Company is changed into or exchanged
for Voting Stock of the surviving corporation or its parent and (b) the holders
of the Voting Stock of the Company immediately prior to such transaction own,
directly or indirectly, not less than a majority of the Voting Stock of the
surviving corporation or its parent immediately after such transaction; (iii) a
"person" or "group" (within the meaning of Sections 13(d) or 14(d)(2) of the
Exchange Act) being or becoming the "beneficial owner" (as defined in Rules
13d-3 and 13d-5 under the Exchange Act) of more than fifty percent (50%) of the
Voting Stock of the Company then outstanding, except in a merger or
consolidation which would not constitute a Change of Control under clause (ii)
above; (iv) during any period of two consecutive years, individuals who at the
beginning of such period constitute the Board of Directors (together with any
new directors whose election by such Board of Directors or whose nomination for
election by the stockholders of the Company was approved by a vote of a
majority of the directors then still in office who were directors at the
beginning of such period or whose election or nomination for election was
previously so approved) cease for any reason (other than death) to constitute a
majority of the Board of Directors then in office; or (v) the approval by the
stockholders of any plan or proposal for the liquidation or dissolution of the
Company.

         "Closing Date" means June 11, 1997.

         "Commission" means the Securities and Exchange Commission, as from
time to time constituted or, if at any time after the execution of this
Indenture such Commission is not existing, then the body performing similar
duties at such time.

         "Common Depository" means the common depository appointed by Morgan
Guaranty Trust Company of New York, Brussels office, as operator of the
Euroclear System, and Cedel Bank, societe anonyme, which shall initially be
Midland Bank plc, including the nominees and successors of any Common
Depository.





                                       3
<PAGE>   14
         "Common Stock" means, with respect to any Person, any and all shares,
interests, participation and other equivalents (however designated, whether
voting or non-voting) of such Person's common stock, whether now outstanding or
issued after the date of this Indenture, and includes, without limitation, all
series and classes of such common stock.

         "Company" means the Person named as the "Company" in the first
paragraph of this Indenture, until a successor Person shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor Person.

         "Company Request" or "Company Order" means a written request or order
signed in the name of the Company by its Chairman, a Vice Chairman, its
President, or a Vice President and by its Treasurer, an Assistant Treasurer,
the Secretary or an Assistant Secretary, and delivered to the Trustee.

         "Conversion Agent" means any Person (including the Company acting as
Conversion Agent) authorized by the Company to effect conversions of the Notes
on behalf of the Company.  Pursuant to the terms hereof, the Company has
initially appointed Midland Bank plc to act as the Principal Conversion Agent,
and Kredietbank S.A. Luxembourgeoise as the Luxembourg Conversion Agent for the
Notes and Swiss Bank Corporation to act as a Conversion Agent.

         "Conversion Date" means the Business Day on which the Conversion Right
is exercised by delivery to the Conversion Agent of the Note surrendered for
conversion and the completed notice of a Noteholder's intention to exercise its
Conversion Right (as set forth in Exhibit E hereto) with respect to any Note.

         "Conversion Price" means $5.00, the price at which Conversion Shares
shall be issued upon conversion, subject to adjustment as set forth herein.

         "Conversion Right" means the right of a Holder of any Note to convert
such Note into Conversion Shares.

         "Conversion Shares" means the Shares into which the Notes are
convertible.

         "Corporate Trust Office" means the principal corporate trust office of
the Trustee, at which at any particular time its corporate trust business shall
be administered, which office at the date of execution of this Indenture is
located at 140 Broadway, New York, New York 10005-1180, except that with
respect to presentation of Notes for payment upon redemption, for conversion or
exchange, such term shall mean the office or agency of the Trustee at which, at
any particular time, its corporate agency business shall be conducted.

         "Corporation" includes corporations, limited liability companies,
limited and general partnerships, associations, joint-stock companies and
business trusts.





                                       4
<PAGE>   15
         "Coupon" means bearer interest Coupons relating to the Bearer Notes
and any replacement Coupons issued pursuant to Section 3.08.

         "Couponholder" means a Person who is the bearer of any Coupon.

         "Default" means any event which is, or after notice or passage of time
or both would be, an Event of Default.

         "Designated Oil and Gas Reserves" means (a) 50% of the SEC Value of
the Proved U.S. Reserves of the Company and its Subsidiaries; and (b) 25% of
the SEC Value of the Proved Colombian Reserves of the Company and its
Subsidiaries.

         "Euroclear" means the Euroclear System.

         "Event of Default" has the meaning specified in Section 5.01.

         "Exchange Act" means the Securities Exchange Act of 1934, as amended.

         "Extraordinary Resolution" means a resolution passed at a meeting of
the Noteholders duly convened and held in accordance with Section 6.13 hereof.

         "Federal Bankruptcy Code" means the Bankruptcy Act or Title 11 of the
United States Code, as amended from time to time.

         "Generally Accepted Accounting Principles" or "GAAP" means generally
accepted accounting principles in the United States, as applied from time to
time by the Company and its Subsidiaries in the preparation of its financial
statements.

         "Good Title" means, with respect to Oil and Gas Properties, good and
defensible title which is (i) a document evidencing rights to a property which
is issued by an applicable and authorized government authority or which is
otherwise evidenced by an instrument or instruments filed of record in
accordance with the conveyance and recording laws of the applicable
jurisdiction and is sufficient against competing claims of bona fide purchasers
for value without notice and (ii) free and clear of all Liens, other than such
Liens that a reasonably prudent purchaser of Oil and Gas Properties would
accept in light of the value of the Oil and Gas Property affected, the
improbability of assertion of the defect or irregularity or the degree of
difficulty or the cost of performing curative work.

         "Group" means the Company and all its Principal Subsidiaries.

         "Guaranty" means all obligations of any Person (other than
endorsements in the ordinary course of business of negotiable instruments for
deposit or collection) of such Person guaranteeing or in effect guaranteeing
any Indebtedness, dividend or other obligation, of any other Person (the





                                       5
<PAGE>   16
"primary obligor") in any manner, whether directly or indirectly, including
without limitation all obligations incurred through an agreement, contingent or
otherwise, by such Person:  (i) to purchase such Indebtedness or obligation or
any Property or assets constituting security therefor, or (ii) to advance or
supply funds (1) for the purchase or payment of such Indebtedness or
obligation, or (2) to enable the recipient of such funds to maintain certain
financial conditions (e.g. agreed amount of working capital) under loan or
similar documents, or (iii) to lease Property or to purchase securities or
other Property or services primarily for the purpose of assuring the owner of
such Indebtedness or obligation of the ability of the primary obligor to make
payment of the Indebtedness or obligation, or (iv) otherwise to assure the
owner of the Indebtedness or obligation of the primary obligor against loss in
respect thereof.  For the purposes of all computations made under this
Indenture, a Guaranty in respect of any Indebtedness shall be deemed to be
Indebtedness equal to the principal amount and accrued interest of such
Indebtedness which has been guaranteed, and a Guaranty in respect of any other
obligation or liability or any dividend shall be deemed to be Indebtedness
equal to the maximum aggregate amount of such obligation, liability or
dividend.

         "Holder" means a Person who is a bearer of a Note or Coupon, as the 
case may be.

         "Hydrocarbon Interests" means all rights, titles, interests and
estates in and to oil and gas leases, oil, gas and mineral leases, oil and gas
concession agreements, production sharing agreements, association contracts and
similar agreements, or other liquid or gaseous hydrocarbon leases, mineral fee
interests, overriding royalty and royalty interests, net profit interests and
production payment interests, or which may arise under operating agreements,
unit agreements or other contract rights, including any reserved or residual
interests of whatever nature and without regard to whether such rights cover or
exist with respect to lands located within or without the United States.

         "Hydrocarbons" means oil, gas, casing head gas, drip gasoline, natural
gasoline, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons and
all products refined therefrom and all other minerals.

         "Indebtedness" of any Person means and includes all present and future
obligations of such Person, which shall include all obligations (i) which in
accordance with generally accepted accounting principles in the United States
shall be classified upon a balance sheet of such Person as liabilities of such
Person, (ii) for borrowed money, (iii) which have been incurred in connection
with the acquisition of Property (including, without limitation, all
obligations of such Person evidenced by any debenture, bond, note, commercial
paper or other similar security, but excluding, in any case, obligations
arising from the endorsement in the ordinary course of business of negotiable
instruments for deposit or collection), (iv) secured by any Lien existing on
Property owned by such Person, even though such Person has not assumed or
become liable for the payment of such obligations, (v) created or arising under
any conditional sale or other title retention agreement with respect to
Property acquired by such Person, notwithstanding the fact that the rights and
remedies of the seller, lender or lessor under such agreement in the event of
default are limited to repossession or sale of such Property, (vi) which are
Capitalized Lease Obligations, (vii) for all Guaranties,





                                       6
<PAGE>   17
whether or not reflected in the balance sheet of such Person and (viii) which
are all reimbursement and other payment obligations (whether contingent,
matured or otherwise) of such Person in respect of any acceptance or
documentary credit.  Notwithstanding the foregoing, Indebtedness shall not
include (i) Indebtedness incidental to the operation of the business of the
Person in the ordinary course and in the aggregate not material to the business
and operations of the Person, (ii) Indebtedness for which the Company or any of
its Subsidiaries are the sole obligors and obligees, and (iii) Indebtedness
represented by purchase, rental or lease obligations not to exceed $1,000,000
in any period of 12 months for any Person and its Subsidiaries.

         "Indenture" means this instrument as originally executed and as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof.

         "Independent Reserve Report" means one or more independent reservoir
engineering reports or other independent third party valuations of the
Company's and its Subsidiaries' Oil and Gas Properties or any portion thereof
which are presented to the Trustee by the Company which are used in determining
the Asset Value Coverage Ratio, each of which reports shall be dated as of the
end of the Company's most recent fiscal year or as of a later date, at the
Company's option.

         "Interest Payment Date" means the Stated Maturity of an instalment of
interest on the Notes.

         "Lien" means any mortgage, charge, pledge, lien, security interest or
encumbrance of any kind whatsoever, including any interest in Property securing
an obligation owed to, or a claim by, a Person other than the owner of the
Property, whether such interest is based on the common law, statute or
contract, and including but not limited to the security interest lien arising
from a mortgage, encumbrance, pledge, conditional sale or trust receipt or a
lease, consignment or bailment for security purposes.  The term "Lien" shall
include reservations, exceptions, encroachments, easements, rights-of-way,
covenants, conditions, restrictions, leases and other title exceptions and
encumbrances affecting Property.  For the purposes of this Indenture, the
Company or its Subsidiary shall be deemed to be the owner of any Property which
it has acquired or holds subject to a conditional sale agreement, financing
lease or other arrangement pursuant to which title to the Property has been
retained by or vested in some other Person for security purposes.

         "Luxembourg Paying Agent and Conversion Agent" means any Person
authorised by the Company to act as the Luxembourg paying and conversion agent
for the Notes until a successor Luxembourg Paying and Conversion Agent shall
have become such pursuant to the applicable provisions of this Indenture, and
thereafter "Luxembourg Paying and Conversion Agent" shall mean such successor
Luxembourg Paying and Conversion Agent.  Pursuant to the terms hereof, the
Company has initially appointed Kredietbank S.A. Luxembourgeoise as the
Luxembourg Paying and Conversion Agent.

         "Mandatory Conversion" means conversion of the Notes at the option of
the Company pursuant to Section 12.11.





                                       7
<PAGE>   18
         "Mandatory Conversion Date" means the date specified in a notice
published by the Company in accordance with Sections 1.07, 1.08 and 12.11, on
which the Noteholders are required to surrender their Notes for conversion.

         "Market Price" means the daily closing sale price of the Common Stock
for a Stock Exchange Business Day.

         "Marketable Securities" means any "security" (as such term is defined
in Section 2(1) of the Securities Act) of any Person listed, admitted to
trading or quoted on the New York Stock Exchange, the AMEX or any Alternative
Stock Exchange.

         "Maturity," when used with respect to any Note, means the date on
which the principal of such Note becomes due and payable as therein or herein
provided, whether at the Stated Maturity or the Redemption Date and whether by
declaration of acceleration, call for redemption or otherwise.

         "Noteholder" means a Person who is the bearer of any Note.

         "Notes" has the meaning stated in the first recital of this Indenture
and more particularly means any Notes authenticated and delivered under this
Indenture.

         "Offering Circular" means that certain Final Offering Circular dated
June 11, 1997, together with all supplements and amendments thereto.

         "Officers' Certificate" means a certificate signed by the Chairman, a
Vice Chairman, the President or a Vice President, and by the Treasurer, an
Assistant Treasurer, the Secretary or an Assistant Secretary of the Company,
and delivered to the Trustee.  Any one individual holding the requisite titles
may sign and deliver an Officer's Certificate without cosignature of another
individual with a requisite title.

         "Oil and Gas Properties" means Hydrocarbon Interests; any Properties
now or hereafter pooled or unitized with Hydrocarbon Interests; all presently
existing or future unitization, pooling agreements and declarations of pooled
units and the units created thereby (including without limitation all units
created under orders, regulations and rules of any governmental body or agency
having jurisdiction) which may affect all or any portion of the Hydrocarbon
Interests; all operating agreements, contracts and other agreements which
relate to any of the Hydrocarbon Interests or the production, sale, purchase,
exchange or processing of Hydrocarbons from or attributable to such Hydrocarbon
Interests; all Hydrocarbons in and under and which may be produced and saved or
attributable to the Hydrocarbon Interests, the lands covered thereby and all
oil in tanks and all rents, issues, profits, proceeds, products, revenues and
other income from or attributable to the Hydrocarbon Interests; all tenements,
hereditaments, appurtenances and Properties in anywise appertaining, belonging,
affixed or incidental to the Hydrocarbon Interests, Properties, rights, titles,
interests and estates described or referred to above, including any and all
Property, real or personal, now owned or hereafter acquired and situated upon,
used, held for use or useful in connection with





                                       8
<PAGE>   19
the operating, working or development of any of such Hydrocarbon Interests
(excluding drilling rigs, automotive equipment or other personal property which
may be on such premises for the purpose of drilling a well or for other similar
temporary uses) and including any and all oil wells, gas wells, injection wells
or other wells, buildings, structures, fuel separators, liquid extraction
plants, plant compressors, pumps, pumping units, field gathering systems, tanks
and tank batteries, fixtures, valves, fittings, machinery and parts, engines,
boilers, meters, apparatus, equipment, appliances, tools, implements, cables,
wires, towers, casing, tubing and rods, surface leases, rights-of-way,
easements and servitudes together with all additions, substitutions,
replacement, accessions and attachments to any and all of the foregoing.

         "Opinion of Counsel" means a written opinion of counsel, who may be
counsel for the Company, including an employee of the Company, and who shall be
reasonably acceptable to the Trustee.

         "Outstanding," when used with respect to Notes, means, as of the date
of determination, all Notes theretofore authenticated and delivered under this
Indenture, except: (1) Notes heretofore cancelled by the Paying and Conversion
Agent or delivered to the Paying and Conversion Agent for cancellation; (2)
Notes, or portions thereof, for whose payment or redemption money in the
necessary amount has been theretofore deposited with the Trustee or any Paying
Agent (other than the Company) in trust or set aside and segregated in trust by
the Company (if the Company shall act as its own Paying Agent) for the Holders
of such Notes; provided that, if such Notes are to be redeemed, notice of such
redemption has been duly given pursuant to this Indenture or provision therefor
satisfactory to the Trustee has been made; (3) Notes, except to the extent
provided in Sections 13.02 and 13.03, with respect to which the Company has
effected defeasance and/or covenant defeasance as provided in Article Thirteen;
and (4) Notes which have been paid pursuant to Section 3.08 or in exchange for
or in lieu of which other Notes have been authenticated and delivered pursuant
to this Indenture, other than any such Notes in respect of which there shall
have been presented to the Trustee proof satisfactory to it that such Notes are
held by a bona fide purchaser in whose hands the Notes are valid obligations of
the Company; provided, however, that in determining whether the Holders of the
requisite principal amount of Outstanding Notes have taken any Act or given or
made any Extraordinary Resolution or other request, demand, authorization,
direction, consent, notice or waiver hereunder, Notes owned by the Company or
any other obligor upon the Notes or any Affiliate of the Company or such other
obligor shall be disregarded and deemed not to be Outstanding, except that, in
determining whether the Trustee shall be protected in making such calculation
or in relying upon any such request, demand, authorization, direction, consent,
notice or waiver, only Notes which the Trustee knows to be so owned shall be so
disregarded.  Notes so owned which have been pledged in good faith may be
regarded as Outstanding if the pledgee establishes to the satisfaction of the
Trustee the pledgee's right so to act with respect to such Notes and that the
pledgee is not the Company or any other obligor upon the Notes or any Affiliate
of the Company or such other obligor.

         "Paying Agent" means any Person (including the Company acting as
Paying Agent) authorized by the Company to pay the principal of or interest on
any Notes on behalf of the





                                       9
<PAGE>   20
Company, including any payment pursuant to Section 10.17 hereof.  Pursuant to
the terms hereof, the Company has initially appointed Midland Bank plc as the
Principal Paying Agent, Kredietbank S.A. Luxembourgeoise as the Luxembourg
Paying Agent and Swiss Bank Corporation as a Paying Agent.

         "Permitted Investments" means:

                 (a)      cash;

                 (b)      U.S. Government Obligations;

                 (c)      any certificate of deposit, time deposit, money
         market account or bankers' acceptance, maturing not more than sixty
         days after the date of acquisition, issued by any commercial banking
         institution that is a member of the Federal Reserve System, including,
         without limitation, the Trustee and its Affiliates, and that has
         combined capital and surplus and undivided profits of not less than
         $500,000,000 whose debt has a rating, at the time as of which any
         investment therein is made, of "P-1" (or higher) according to Moody's
         Investors Service, Inc. or any successor rating agency, or "A-1" (or
         higher) according to Standard and Poor's Ratings Group or any
         successor rating agency;

                 (d)      commercial paper, maturing not more than sixty days
         after the date of acquisition, issued by any corporation (other than
         an Affiliate of the Company) organized and existing under the laws of
         the United States of America with a rating, at the time as of which
         any investment therein is made, of "P-1" (or higher) according to
         Moody's Investors Service, Inc. or any successor rating agency, or
         "A-1" (or higher) according to Standard and Poor's Ratings Group or
         any successor rating agency; and

                 (e)      shares of any mutual fund that invests exclusively in
         the types of debt instruments described above, including one managed
         by the Trustee or any of its Affiliates, that invests not less than
         seventy-five percent (75%) of the capital of such mutual fund in the
         foregoing types of investment; provided,  that, solely for purposes of
         this clause (e), such investments may mature more than sixty days
         after the date of acquisition.

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

         "Predecessor Note" of any particular Note means every previous Note
evidencing all or a portion of the same debt as that evidenced by such
particular Note; and, for the purposes of this definition, any Note
authenticated and delivered under Section 3.08 in exchange for or in lieu of a
mutilated, lost, destroyed or stolen Note shall be deemed to evidence the same
debt as the mutilated, lost, destroyed or stolen Note.





                                       10
<PAGE>   21
         "Preferred Stock" means, with respect to any Person, any and all
shares, interests, participation or other equivalents (however designated) of
such Person's preferred or preference stock whether now outstanding or issued
on or after the date of this Indenture, and includes, without limitation, all
classes and series of preferred or preference stock.

         "Presentation Date" means the date on which a Note is presented by a
Noteholder for payment of principal or a Coupon is presented by the
Couponholder for payment of interest, as the case may be.

         "Principal Paying and Conversion Agent" means any Person authorized by
the Company to act as the principal paying and conversion agent for the Notes
until a successor Principal Paying and Conversion Agent shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Principal Paying and Conversion Agent" shall mean such successor Principal
Paying and Conversion Agent.  Pursuant to the terms hereof, the Company has
initially appointed Midland Bank plc as the Principal Paying and Conversion
Agent.

         "Principal Subsidiary" means a Subsidiary of the Company:

                 (a)      whose gross assets represent 10 percent or more of
         the consolidated gross assets of the Group as calculated by reference
         to the then latest audited financial statements of the Group;  or

                 (b)      to which is transferred all or substantially all of
         the business, undertaking and assets of a Subsidiary of the Company
         which immediately prior to such transfer is a Principal Subsidiary,
         whereupon the transferor Subsidiary shall immediately cease to be a
         Principal Subsidiary and the transferee Subsidiary shall cease to be a
         Principal Subsidiary under the provisions of this sub-paragraph (b)
         (but without prejudice to the provisions of sub-paragraph (a) above),
         upon publication of its next audited financial statements; and

                 (c)      and shall include, for the avoidance of doubt, Harken
         Exploration Company, Harken Energy West Texas, Inc., Harken Southwest
         Corporation, Search Acquisition Corp., and Harken de Colombia, Ltd.

         "Property" means any interest in any kind of property or asset,
whether real, personal or mixed, or tangible or intangible, and including any
Oil and Gas Property.

         "Proved Colombian Reserves" means the estimated quantities of crude
oil, natural gas and natural gas liquids, which geological and engineering data
demonstrate according to engineering standards to be recoverable in future
years from known reservoirs under existing economical and operating conditions,
located in Colombia or in territories or regions controlled by Colombia,
including any territorial waters, all as set forth in any Independent Reserve
Report.

         "Proved U.S. Reserves" means the estimated quantities of crude oil,
natural gas and natural





                                       11
<PAGE>   22
gas liquids, which geological and engineering data demonstrate according to
engineering standards to be recoverable in future years from known reservoirs
under existing economical and operating conditions, located in the United
States or in territories or regions controlled by the United States, including
any territorial waters, all as set forth in any Independent Reserve Report.

         "Purchase Date" has the meaning specified in Section 10.17.

         "Purchase Price" has the meaning specified in Section 10.17.

         "Redemption Date," when used with respect to any Note to be redeemed,
in whole or in part, means the date fixed for such redemption by or pursuant to
this Indenture.

         "Redemption Price," when used with respect to any Note to be redeemed,
means the price at which it is to be redeemed pursuant to the terms hereof plus
accrued interest to the Redemption Date.

         "Regulation S" means Regulation S under the Securities Act as in
effect on the date hereof or as such Regulation  may hereafter be amended and
deemed applicable to the Notes.

         "Relevant Date" means the date on which the payment first becomes due;
provided, that if the full amount of the money payable has not been received by
the Principal Paying Agent or the Trustee on or before the due date, it shall
mean the date on which, the full amount of the money having been so received,
notice to that effect shall have been duly given to the Noteholders by the
Company in accordance with Section 1.08.

         "Required Assets" means any combination of (i) 100% of the aggregate
amount then on deposit in the Segregated Account, including the aggregate
amount invested in Permitted Investments, to the extent applicable, and (ii)
the Designated Oil and Gas Reserves.

         "Responsible Officer," when used with respect to the Trustee, means
any trust officer or assistant trust officer or any other officer of the
Trustee customarily performing functions similar to those performed by any of
the above-designated officers, and also means, with respect to a particular
corporate trust matter, any other officer to whom such matter is referred
because of such officer's knowledge of and familiarity with the particular
subject.

         "Restricted Period" means the forty (40) calendar day period
commencing after the Closing Date.

         "SEC Value" means the discounted present value of future net reserves
attributable to Proved Reserves, as calculated under any Independent Reserve
Report in accordance with the rules and regulations promulgated by the
Commission from time to time in effect.

         "Securities Act" means the Securities Act of 1933, as amended.





                                       12
<PAGE>   23
         "Segregated Account" means a segregated non-interest bearing trust
account of the Company to be maintained with the Trustee and invested and
reinvested at the direction of the Company, until such time as it may be
distributed to the Company in accordance with Section 6.12.

         "Shares" means the common stock, par value U.S.$0.01, of the Company
(and all other (if any) shares or stock resulting from any sub-division,
consolidation or reclassification of such shares).

         "Stated Maturity," when used with respect to any Indebtedness or any
instalment of principal thereof or interest thereon, means the date specified
in such Indebtedness as the fixed date on which the principal of such
Indebtedness or such instalment of principal or interest is due and payable.

         "Stock Exchange Business Day" means any day (other than a Saturday or
Sunday) on which the AMEX or the Alternative Stock Exchange, as the case may
be, is open for business.

         "Subordinated Obligation" means any Indebtedness of the Company
outstanding on such date which is contractually subordinate or junior in right
of payment to the Notes.  Notwithstanding the immediately preceding sentence,
any Indebtedness and shares of Preferred Stock issued by any Subsidiary shall,
for purposes of this definition, be treated as Subordinated Obligations.

         "Subsidiary" of any Person means any Corporation of which at least a
majority of the shares of stock having by the terms thereof ordinary voting
power to elect a majority of the Board of Directors of such Corporation
(irrespective of whether or not at the time stock of any other class or classes
of such Corporation shall have or might have voting power by reason of the
happening of any contingency) is directly or indirectly owned or controlled by
any one of or any combinations of the Company or one or more of the Principal
Subsidiaries.

         "Trustee" means the Person named as the "Trustee" in the first
paragraph of this Indenture until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean such successor Trustee.

         "Unexercised Note" means any Note with respect to which Conversion
Rights have not been exercised by the Noteholder.

         "U.S. Government Obligations" means securities that are (x) direct
obligations of the United States of America for the timely payment of which its
full faith and credit is pledged or (y) obligations of a Person controlled or
supervised by and acting as an agency or instrumentality of the United States
of America the timely payment of which is unconditionally guaranteed as a full
faith and credit obligation by the United States of America, which, in either
case, are not callable or redeemable at the option of the issuer thereof, and
shall also include a depository receipt issued by a bank (as defined in Section
3(a)(2) of the Securities Act), as custodian with respect to any such U.S.
Government Obligation or a specific payment of principal of or interest on any
such U.S. Government Obligation held by such custodian for the account of the
holder of such depository receipt, provided that (except as required by law)
such custodian is not authorized to make any





                                       13
<PAGE>   24
deduction from the amount payable to the holder of such depository receipt from
any amount received by the custodian in respect of the U.S. Government
Obligation or the specific payment of principal of or interest on the U.S.
Government Obligation evidenced by such depository receipt.

         "U.S. Person" means any Person who is a "U.S. person" as defined in 
Regulation
                                      S.

         "Vice President," when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president".

         "Voting Stock" of any Person means Capital Stock of such Person which
ordinarily is entitled (without regard to the occurrence of any additional
event or contingency) to vote for the election of directors (or persons
performing similar functions) of such Person.

         SECTION 1.02     Other Definitions.

<TABLE>
<CAPTION>
                 Term                              Defined in Section 
                 ----                              ------------------
                 <S>                                       <C>        
                 Agency Agreement                          10.02      
                 Bearer Notes                               2.01      
                 Commencement Date                         12.04   
                 Covenant defeasance                       13.03   
                 Current Event                             12.04   
                 Expiration Time                           12.04   
                 Global Note                                2.01   
                 legal defeasance                          13.02   
                 Notice                                     1.08   
                 Other Event                               12.04   
                 Reference Date                            12.04   
</TABLE>

         SECTION 1.03     Rules of Construction.

         For all purposes of this Indenture, except as otherwise expressly
provided or unless the context otherwise requires:

                 (a)      all the terms defined in this Article have the
         meanings assigned to them in this Article, and include the plural as
         well as the singular;

                 (b)      all accounting terms not otherwise defined herein
         have the meanings assigned to them in accordance with GAAP;

                 (c)      all ratios and computations based on GAAP contained
         in this Indenture shall be computed in accordance with the definition
         of GAAP set forth above;





                                       14
<PAGE>   25
                 (d)      the words "herein," "hereof" and "hereunder" and
         other words of similar import refer to this Indenture as a whole and
         not to any particular Article, Section or other subdivision of this
         Indenture;

                 (e)      "or" is not exclusive;

                 (f)      all references to $, U.S.$, dollars or United States
         dollars shall refer to the lawful currency of the United States of
         America;

                 (g)      provisions apply to successive events and
         transactions;

                 (h)      all references to Sections or Articles refer to
         Sections or Articles of this Indenture unless otherwise indicated; and

                 (i)      all references to Terms or Conditions refer to the
         Terms and Conditions of the Notes unless otherwise indicated.

         SECTION 1.04     Compliance Certificates and Opinions.

         Upon any application or request by the Company to the Trustee to take
any action under any provision of this Indenture, the Company shall, with
respect to any application or request to make an optional redemption or
Mandatory Conversion and, upon the request of the Trustee with respect to any
other application or request, furnish to the Trustee an Officers' Certificate
stating that all conditions precedent, if any, provided for in this Indenture
(including any covenant compliance with which constitutes a condition
precedent) relating to the proposed action have been complied with and an
Opinion of Counsel stating that in the opinion of such counsel all such
conditions precedent, if any, have been complied with, except that in the case
of any such application or request as to which the furnishing of such documents
is specifically required by any provision of this Indenture relating to such
particular application or request, no additional certificate or opinion need be
furnished.

         Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture shall include:

                 (a)      a statement that each individual signing such
         certificate or opinion has read such covenant or condition and the
         definitions herein relating thereto;

                 (b)      a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                 (c)      a statement that, in the opinion of each such
         individual, such individual has made such examination or investigation
         as is necessary to enable such individual to express





                                       15
<PAGE>   26
         an informed opinion as to whether or not such covenant or condition
         has been complied with; and

                 (d)      a statement as to whether, in the opinion of each
         such individual, such condition or covenant has been complied with.

         SECTION 1.05     Form of Documents Delivered to Trustee.

         In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

         Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which such officer's certificate or opinion is
based are erroneous.  Any such certificate or Opinion of Counsel may be based,
insofar as it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

         SECTION 1.06     Acts of Noteholders.

                 (a)      Any Extraordinary Resolution, request, demand,
         authorization, direction, declaration, notice, consent, waiver or
         other action provided by this Indenture to be given or taken by
         Noteholders may be embodied in and evidenced by one or more
         instruments of substantially similar tenor signed by such Noteholders
         in person or by agents duly appointed in writing; and, except as
         herein otherwise expressly provided, such action shall become
         effective when such instrument or instruments are delivered to the
         Trustee and, where it is hereby expressly required, to the Company.
         Such instrument or instruments (and the action embodied therein and
         evidenced thereby) are herein sometimes referred to as the "Act" of
         the Noteholders signing such instrument or instruments.  Proof of
         execution of any such instrument or of a writing appointing any such
         agent shall be sufficient for any purpose of this Indenture and
         conclusive in favour of the Trustee and the Company, if made in the
         manner provided in this Section.





                                       16
<PAGE>   27
                 (b)      The fact and date of the execution by any Person of
         any such instrument or writing may be proved by the affidavit of a
         witness of such execution or by a certificate of a notary public or
         other officer authorized by law to take acknowledgments of deeds,
         certifying that the individual signing such instrument or writing
         acknowledged to such witness, notary public or other such officer the
         execution thereof.  Where such execution is by a signer acting in a
         capacity other than such signer's individual capacity, such
         certificate or affidavit shall also constitute sufficient proof of
         authority.  The fact and date of the execution of any such instrument
         or writing, or the authority of the Person executing the same, may
         also be proved in any other manner which the Trustee deems sufficient.

                 (c)      Any Extraordinary Resolution, request, demand,
         authorization, direction, notice, consent, waiver or other Act of the
         Holders of any Note shall bind every future Holder of the same Note
         and the Holder of every Note issued upon conversion or redemption
         thereof or in exchange therefor or in lieu thereof in respect of
         anything done, omitted or suffered to be done by the Trustee or the
         Company in reliance thereon, whether or not notation of such action is
         made upon such Note.

         SECTION 1.07     Notices, Etc., to Trustee and Company.

         Any request, demand, authorization, direction, declaration, notice,
consent, waiver, Extraordinary Resolution or Act of Noteholders or other
document provided or pertained by this Indenture (herein collectively called
"Notice") to be made upon, given or furnished to, or filed with:

                 (a)      the Trustee by any Noteholder or by the Company shall
         be sufficient for every purpose hereunder if made, given, furnished or
         filed in writing to or with the Trustee and received at its Corporate
         Trust Office, Attention: Corporate Trust Services - Harken, Tel. (212)
         658-1000, Fax. (212) 658-6425, or

                 (b)      the Company by the Trustee or by any Noteholder shall
         be sufficient for every purpose hereunder (unless otherwise herein
         expressly provided) if made, given, furnished or filed in writing to
         or with the Company addressed to it at the address of its principal
         office which shall initially be: Harken Energy Corporation, 5605 North
         MacArthur Boulevard, Suite 400, Irving, Texas 75038, Attention: Bruce
         N. Huff, Senior Vice President and Chief Financial Officer, Tel. (972)
         753-6939, Fax. (972) 753-6926, with a copy to Larry E.  Cummings,
         General Counsel, Tel. (972) 753-6932, Fax. (972) 753-6963.

         Any Notice to be given hereunder by any party to another shall be in
writing and in English (by letter, telex or fax) delivered in person or by
courier service requiring acknowledgment of delivery, mailed by first class
mail, postage prepaid, or sent by fax or telex to the addressee (including
telecopier number, if applicable) set forth herein.  Except for notices to the
Trustee, Notice given by mail, fax, personal delivery or courier service shall
be effective upon actual receipt.  Notice given by telex shall be effective
upon receipt by the sender of the addressee's answer-back at the end of
transmission, provided that any such Notice or other communication which would





                                       17
<PAGE>   28
otherwise take effect after 4:00 p.m. on any particular day shall not take
effect until 10:00 a.m. on the immediately succeeding Business Day in the place
of the addressee.  A party may change any address to which Notice is to be
given to it by giving Notice as provided above of such change of address.

         SECTION 1.08     Notice to Noteholders; Waiver.

         Where this Indenture provides for notice of any event to Noteholders
by the Company or the Trustee, such notice shall be sufficiently given (unless
otherwise herein expressly provided) if published in the Authorized Newspapers.
Neither the Trustee nor the Company need give any notice to the Couponholders
and such Couponholders will be deemed to have notice of the contents of any
notice given to the Noteholders in accordance with this Section.

         In case by reason of any cause it shall be impracticable to publish
notice of any event to the Noteholders when such notice is required to be given
pursuant to any provision of this Indenture, then any manner of giving such
notice as shall be satisfactory to the Trustee shall constitute a sufficient
notification for every purpose hereunder.

         SECTION 1.09     Effect of Headings and Table of Contents.

         The Article and Section headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.

         SECTION 1.10     Successors and Assigns.

         All covenants and agreements in this Indenture by the Company shall
bind its successors and assigns, whether so expressed or not.

         SECTION 1.11     Separability Clause.

         In case any provision in this Indenture or in the Notes shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions, to the extent permitted by law, shall not in any way
be affected or impaired thereby.

         SECTION 1.12     Benefits of Indenture.

         Nothing in this Indenture or in the Notes, express or implied, shall
give to any Person, other than the parties hereto, any Paying Agent, any
Conversion Agent and their respective successors hereunder, and the Noteholders
any legal or equitable right, remedy or claim under this Indenture.





                                       18
<PAGE>   29
         SECTION 1.13     Governing Law.

         THIS INDENTURE AND THE NOTES SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK WITHOUT GIVING EFFECT TO THE
CONFLICTS OF LAWS PRINCIPLES THEREOF.

         SECTION 1.14     Legal Holidays.

         In any case where any Interest Payment Date, Conversion Date,
Redemption Date or Stated Maturity or Maturity of any Note or Coupon shall not
be a Business Day, then (notwithstanding any other provision of this Indenture
or of the Notes or Coupons) payment of interest or principal or any other
payment required to be made on such date need not be made on such date, but
shall be made on the immediately following Business Day with the same force and
effect as if made on the Interest Payment Date or Redemption Date, or at the
Stated Maturity or Maturity.


                                  ARTICLE TWO

                               FORMS OF THE NOTES

         SECTION 2.01     Forms Generally.

         The Notes and the Trustee's certificate of authentication shall be in
substantially the forms set forth in this Article, with such appropriate
insertions, omissions, substitutions and other variations as are required or
permitted by this Indenture, and may have such letters, numbers or other marks
of identification and such legends or endorsements placed thereon as may be
required by applicable law or rules or regulations thereunder or as may,
consistently herewith, be determined by the officer or officers executing such
Notes, as evidenced by their execution of the Notes.  Any portion of the text
of any Note may be set forth on the reverse thereof.

         The definitive Notes shall be typed, printed, lithographed or engraved
on steel-engraved borders or may be produced in any other manner as determined
by the officers of the Company executing such Notes, as evidenced by their
execution in accordance with Section 3.03 of such Notes.

         The Notes shall be known as the "5.5% Senior Convertible Notes Due
2002" of the Company.  The Notes and the Trustee's certificate of
authentication shall be in substantially the form annexed hereto as Exhibit A.
The Company shall approve the form of the Notes and any notation, legend or
endorsement on the Notes.  Each Note shall be dated as of June 11, 1997.

         The terms and provisions contained in the form of the Bearer Notes
annexed hereto as Exhibit A and in the form of the Global Note annexed hereto
as Exhibit B shall constitute, and are hereby expressly made, a part of this
Indenture.  To the extent applicable, the Company and the





                                       19
<PAGE>   30
Trustee, by their execution and delivery of this Indenture, expressly agree to
such terms and provisions and to be bound thereby.

         The Notes shall be issued initially in the form of a temporary global
bearer note substantially in the form set forth in Exhibit B (the "Global
Note") deposited with the Common Depository, duly executed by the Company and
authenticated by the Trustee as hereinafter provided.  The aggregate principal
amount of the Global Note may from time to time be decreased by adjustments
made on the records of the Common Depository or its nominee, as hereinafter
provided.

         The Notes offered and sold, other than as described in the preceding
paragraph, shall be issued in form of permanent certificated Notes in bearer
form in substantially the form set forth in Exhibit A (the "Bearer Notes").

         The Terms and Conditions contained in the form of the Bearer Notes
annexed hereto as Exhibit A are expressly incorporated by reference herein.  To
the extent applicable, the Company and the Trustee, by their execution and
delivery of this Indenture, expressly agree to such terms and provisions and to
be bound thereby.  To the extent of any conflict between the Terms and
Conditions and the provisions of this Indenture, the Terms and Conditions shall
control the interpretation of the terms of the Note and this Indenture.

         SECTION 2.02     Restrictive Legends.

         Each Bearer Note and each Coupon shall bear the following legend on
the face thereof:

         NEITHER THIS NOTE NOR THE SHARES OF COMMON STOCK ISSUABLE UPON
         CONVERSION OF THIS NOTE HAVE BEEN OR WILL BE REGISTERED UNDER THE
         UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
         ACT") AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED, CONVERTED OR
         OTHERWISE DISPOSED OF IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT
         OR BENEFIT OF, ANY "U.S. PERSON" (AS DEFINED IN REGULATION S UNDER THE
         SECURITIES ACT) UNLESS THIS NOTE AND THE SHARES HAVE BEEN REGISTERED
         UNDER THE SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES OR BLUE
         SKY LAWS OR EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SUCH LAWS
         ARE AVAILABLE.

         ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
         LIMITATIONS UNDER THE U.S. INCOME TAX LAWS, INCLUDING THE LIMITATIONS
         PROVIDED IN SECTIONS 165(j) AND 1287(a) OF THE UNITED STATES INTERNAL
         REVENUE CODE OF 1986, AS AMENDED.

         Each Global Note shall bear the following legend on the face thereof:





                                       20
<PAGE>   31
         THIS NOTE HAS NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED
         STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") AND
         MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED, CONVERTED OR OTHERWISE
         DISPOSED OF IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT
         OF, ANY "U.S. PERSON" (AS DEFINED IN REGULATION S UNDER THE SECURITIES
         ACT) UNLESS THIS NOTE HAS BEEN REGISTERED UNDER THE SECURITIES ACT AND
         ANY APPLICABLE STATE SECURITIES OR BLUE SKY LAWS OR EXEMPTIONS FROM
         THE REGISTRATION REQUIREMENTS OF SUCH LAWS ARE AVAILABLE.

         ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
         LIMITATIONS UNDER THE U.S. INCOME TAX LAWS, INCLUDING THE LIMITATIONS
         PROVIDED IN SECTIONS 165(j) AND 1287(a) OF THE UNITED STATES INTERNAL
         REVENUE CODE OF 1986, AS AMENDED.

In the event that Regulation S is amended during the period while any Note or
Coupon remains outstanding and the Company determines that the foregoing
restrictive legends are required to be amended as a result thereof, the Company
shall provide the Trustee with notice pursuant to Section 1.09 setting forth
the revised form of restricted legend that the Company believes is required and
shall provide the Trustee with an Opinion of Counsel to the effect that such
restrictive legends are required to be amended.  The form of Bearer Note set
forth at Exhibit A and each Global Note shall be deemed to be so amended
effective at the date of such notice to the Trustee.


                                 ARTICLE THREE

                                   THE NOTES

         SECTION 3.01     Terms.

         The aggregate principal amount of Notes which may be authenticated and
delivered under this Indenture is limited to $70,000,000, except for Notes
authenticated and delivered in exchange for, or in lieu of, other Notes
pursuant to Section 3.03, 3.04, 3.05, 3.06, 3.08, 9.05 or 11.08.  Their Stated
Maturity shall be June 11, 2002, and they shall bear interest at the rate per
annum specified therein from the Closing Date or from the most recent Interest
Payment Date to which interest has been paid or duly provided for, payable in
arrears, and thereafter as provided in the Notes and at said Stated Maturity,
until the principal thereof is paid or duly provided for.

         The principal of and interest on the Notes shall be payable at the
office or agency of the Company maintained for such purpose in The City of
London, or at such other office or agency of the Company as may be maintained
for such purpose.

         The Notes shall be convertible as provided in Article Twelve.





                                       21
<PAGE>   32
         The Notes shall be redeemable as provided in Article Eleven.

         The Notes shall rank pari passu with the 6.5% Senior Convertible Notes
due 2000 of the Company.

         The Notes shall be senior in right of payment to Subordinated
Obligations as provided in Article Fourteen.

         SECTION 3.02     Denominations.

         The Notes shall be issuable only in bearer form and, in the case of
Bearer Notes, with Coupons attached thereto, and shall be issuable only in
denominations of $10,000 and $50,000.

         SECTION 3.03     Execution, Authentication, Delivery and Dating.

         The Notes shall be executed on behalf of the Company by its Chairman,
a Vice Chairman, its President or a Vice President under a facsimile of its
corporate seal reproduced thereon and attested by its Secretary or an Assistant
Secretary.  The signature of any of these officers on the Notes may be manual
or facsimile signatures of the present or any future such authorized officer
and may be imprinted or otherwise reproduced on the Notes.

         Notes bearing the manual or facsimile signatures of individuals who
were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Notes or did not hold
such offices at the date of such Notes.

         At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Notes executed by the Company to the
Trustee for authentication, together with a Company Order for the
authentication and delivery of such Notes, and the Trustee or the
Authenticating Agent in accordance with such Company Order shall authenticate
and deliver such Notes.  Such Company Order shall specify the amount of Notes
to be authenticated and the date on which the original issue of Notes is to be
authenticated.  The aggregate principal amount of Notes outstanding at any time
may not exceed $70,000,000 except for Notes authenticated and delivered in
exchange for, or in lieu of, other Notes pursuant to Section 3.04, 3.05 or
3.08.

         Each Note shall be dated as of June 11, 1997.

         No Note shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Note a
certificate of authentication substantially in the form provided for in Exhibit
A duly executed by the Trustee or the Authenticating Agent by manual or
facsimile signature of an authorized officer, and such certificate upon any
Note shall be conclusive evidence, and the only evidence, that such Note has
been duly authenticated and delivered hereunder and is entitled to the benefits
of this Indenture.





                                       22
<PAGE>   33
         In case the Company, pursuant to Article Eight, shall be consolidated
or merged with or into any other Person or shall convey, transfer, lease or
otherwise dispose of its properties and assets substantially as an entirety to
any Person, and the successor Person resulting from such consolidation, or
surviving such merger, or into which the Company shall have been merged, or the
Person which shall have received a conveyance, transfer, lease or other
disposition as aforesaid, shall have executed an indenture supplemental hereto
with the Trustee pursuant to Article Eight, any of the Notes authenticated or
delivered prior to such consolidation, merger, conveyance, transfer, lease or
other disposition may, from time to time, at the request of the successor
Person, be exchanged for other Notes executed in the name of the successor
Person with such changes in phraseology and form as may be appropriate, but
otherwise in substance of like tenor as the Notes surrendered for such exchange
and of like principal amount; and the Trustee or an Authenticating Agent, upon
Company Request of the successor Person, shall authenticate and deliver Notes
as specified in such request for the purpose of such exchange.

         SECTION 3.04     Temporary Notes.

         Pending the preparation of definitive Notes, but in no event prior to
July 22, 1997, the Company may execute, and upon Company Order the Trustee or
an Authenticating Agent shall authenticate and deliver, temporary Notes which
are printed, lithographed, typewritten, mimeographed or otherwise produced, in
any authorized denomination, substantially of the tenor of the definitive Notes
in lieu of which they are issued and with such appropriate insertions,
omissions, substitutions and other variations as the officers executing such
Notes may determine, as conclusively evidenced by their execution of such
Notes.

         If temporary Notes are issued, the Company will cause definitive Notes
to be prepared without unreasonable delay, but in no event prior to July 22,
1997.  After the preparation of definitive Notes, the temporary Notes shall be
exchangeable for definitive Notes upon surrender of the temporary Notes at the
office or agency of the Company designated for such purpose pursuant to Section
10.02, without charge to the Noteholder.  Upon surrender for cancellation of
any one or more temporary Notes, the Company shall execute and the Trustee or
an Authenticating Agent shall authenticate and deliver in exchange therefor a
like principal amount of definitive Notes of authorized denominations.  Until
so exchanged, the temporary Notes shall in all respects be entitled to the same
benefits under this Indenture as definitive Notes.

         SECTION 3.05     Exchange.

         Upon surrender for exchange of any Note at the office or agency of the
Company designated pursuant to Section 10.02, the Company shall execute, and
the Trustee or the Authenticating Agent shall authenticate and deliver, in the
name of the designated transferee or transferees, one or more new Notes of any
authorized denomination or denominations of a like aggregate principal amount.

         Furthermore, any Holder of the Global Note shall, by acceptance of
such Global Note, agree that transfers of beneficial interest in such Global
Note may be effected only through a book-entry





                                       23
<PAGE>   34
system maintained by the Holder of such Global Note (or its agent), and that
ownership of a beneficial interest in the Global Note shall be required to be
reflected in a book entry.

         At the option of the Noteholder, Notes may be exchanged for other
Notes of the Authorized Denomination and of a like aggregate principal amount,
upon surrender of the Notes to be exchanged at such office or agency.  Whenever
any Notes are so surrendered for exchange, the Company shall execute, and the
Trustee or an Authenticating Agent shall authenticate and deliver, the Notes
which the Noteholder making the exchange is entitled to receive.

         All Notes issued upon any exchange of Notes shall be the valid
obligations of the Company, evidencing the same debt, and entitled to the same
benefits under this Indenture, as the Notes surrendered upon such exchange.

         Every Note presented or surrendered for exchange shall (if so required
by the Company or the Trustee) be duly endorsed, or be accompanied by a written
instrument of transfer, in form satisfactory to the Company and the Trustee,
duly executed by the Noteholder thereof or such Noteholder's attorney duly
authorized in writing.

         No service charge shall be made for any exchange, conversion or
redemption of Notes, but the Company may require payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed in connection
with any exchange of Notes, other than exchanges pursuant to Sections 3.03,
3.04, 3.05, 3.06, 9.05, or 11.08.

         The Company shall not be required (i) to issue or exchange any Note
during a period beginning at the opening of business 15 days before the
selection of Notes to be redeemed under Section 11.04 and ending at the close
of business on the day of such mailing of the relevant notice of redemption,
(ii) to exchange any Note so selected for redemption in whole or in part,
except the unredeemed portion of any Note being redeemed in part or (iii) to
register the transfer of or exchange of any Note during a period beginning five
days before the date of Maturity and ending on such date of Maturity.

         SECTION 3.06     Book-Entry Provisions for Global Note.

                 (a)      The Global Note initially shall be delivered to the
         Common Depository and shall bear the legends set forth in Section
         2.02. Members of, or participants in, Euroclear and Cedel ("Agent
         Members") shall have no rights under this Indenture with respect to
         any Global Note held on their behalf by the Common Depository, or
         under the Global Note, and the Common Depository may be treated by the
         Company, the Trustee and any agent of the Company or the Trustee as
         the absolute owner of such Global Note for all purposes whatsoever.
         Notwithstanding the foregoing, nothing herein shall prevent the
         Company, the Trustee or any agent of the Company or the Trustee, from
         giving effect to any written certification, proxy or other
         authorization furnished by the Common Depository or shall





                                       24
<PAGE>   35
         impair, as between the Common Depository and the Agent Members, the
         operation of customary practices governing the exercise of the rights
         of a Noteholder.

                 (b)      Transfers of the Global Note shall be limited to
         transfers of such Global Note in whole, but not in part, to the Common
         Depository, its successors or their respective nominees.  Interests of
         beneficial owners in the Global Note may be transferred in accordance
         with the rules and procedures of the Common Depository and the
         provisions of Section 3.06.  Beneficial owners may obtain Bearer Notes
         in exchange for their beneficial interests in the Global Note upon
         request in accordance with the Common Depository's procedures.  In
         addition, Bearer Notes shall be transferred to all beneficial owners
         in exchange for their beneficial interests in the Global Note if (i)
         the Common Depository notifies the Company that it is unwilling or
         unable to continue as Common Depository for the Global Note and a
         successor depository is not appointed by the Company within 90 days of
         such notice or (ii) an Event of Default has occurred and is continuing
         and the Trustee has received a request from the Common Depository.

                 (c)      In connection with any transfer of a portion of the
         beneficial interest in the Global Note to beneficial owners pursuant
         to subsection (b) of this Section, the Common Depository shall reflect
         on its books and records the date and a decrease in the principal
         amount of the Global Note in an amount equal to the principal amount
         of the beneficial interest in the Global Note to be transferred, and
         the Company shall execute, and the Trustee or an Authenticating Agent
         shall authenticate and deliver, one or more Bearer Notes of like tenor
         and amount.

                 (d)      In connection with the transfer of the entire Global
         Note to beneficial owners pursuant to subsection (b) of this Section,
         the Global Note shall be deemed to be surrendered to the Trustee for
         cancellation, and the Company shall execute, and the Trustee or an
         Authenticating Agent shall authenticate and deliver, to each
         beneficial owner identified by the Common Depository in exchange for
         its beneficial interest in the Global Note, an equal aggregate
         principal amount of Bearer Notes of authorized denominations.

                 (e)      Any Bearer Note delivered in exchange for an interest
         in the Global Note pursuant to subsection (b) or subsection (c) of
         this Section shall bear the applicable legend regarding transfer
         restrictions applicable to the Bearer Note set forth in Section 2.02.

                 (f)      The Holder of the Global Note may grant proxies and
         otherwise authorize any person, including Agent Members and persons
         that may hold interests through Agent Members, to take any action
         which a Noteholder is entitled to take under this Indenture or the
         Notes.

                 (g)      Any Bearer Note delivered in exchange for an interest
         in the Global Note pursuant to subsection (b) or (c) of this Section
         will prior to delivery to the Noteholder have





                                       25
<PAGE>   36
         all matured Coupons as of such delivery date, which are attached to
         such Bearer Note, cancelled and voided by the Authenticating Agent.

                 (h)      Nothing contained herein shall be deemed to authorize
         any transfers (by book-entry or otherwise) of the Global Note prior to
         July 22, 1997, it being understood that no transfers of the Global
         Note or any beneficial interest may occur until after July 21, 1997.

         SECTION 3.07     Special Transfer Provisions.

         The Noteholders by acceptance of the Notes hereby covenant and agree
that neither the Notes nor the Conversion Shares will be offered, sold,
transferred, pledged, converted or otherwise disposed of in the United States
or to, or for the account or benefit of, any U.S. Person unless the Notes and
the Conversion Shares have been registered under the Securities Act and any
applicable state securities or blue sky laws or exemptions from the
registration requirements of such laws are available.

         SECTION 3.08     Mutilated, Destroyed, Lost and Stolen Notes.

         If (i) any mutilated Note or Coupon is surrendered to the Trustee or
the Authenticating Agent, or (ii) the Company and the Trustee receive evidence
to their satisfaction of the destruction, loss or theft of any Note or Coupon,
and there is delivered to the Company and the Trustee such security and/or
indemnity as may be required by them to save each of them harmless, then, in
the absence of notice to the Company or the Trustee that such Note or Coupon
has been acquired by a bona fide purchaser, the Company shall execute and upon
Company Order the Trustee or an Authenticating Agent shall authenticate and
deliver, in exchange for any such mutilated Note or Coupon or in lieu of any
such destroyed, lost or stolen Note or Coupon, a new Note or Coupon of like
tenor and principal amount, bearing a number not contemporaneously Outstanding.

         In case any such mutilated, destroyed, lost or stolen Note or Coupon
has become or is about to become due and payable, the Company in its discretion
may, instead of issuing a new Note or Coupon, pay such Note or Coupon, as the
case may be.

         Upon the issuance of any new Note or Coupon under this Section, the
Company may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Trustee and the Authenticating
Agent) connected therewith.

         Every new Note or Coupon issued pursuant to this Section in lieu of
any destroyed, lost or stolen Note or Coupon shall constitute an original
additional contractual obligation of the Company, whether or not the destroyed,
lost or stolen Note or Coupon shall be at any time enforceable by anyone, and
shall be entitled to all benefits of this Indenture equally and proportionately
with any and all other Notes or Coupons duly issued hereunder.





                                       26
<PAGE>   37
         The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the
replacement or payment of mutilated, destroyed, lost or stolen Note or Coupon.

         Any new Note issued under this Section 3.08 in lieu of any destroyed,
lost or stolen Note shall be issued by the Authenticating Agent with all
matured Coupons as of such date of issuance cancelled or voided.

         SECTION 3.09     Payment of Interest; Interest Rights Preserved.

         Interest on any Note which is payable, and is punctually paid or duly
provided for, on any Interest Payment Date, shall be paid to the bearer against
presentation and surrender (or in the case of part payment only, endorsement)
of the relevant Coupons, outside of the United States at the corporate trust
office or agency of any Paying Agent maintained for such purpose pursuant to
Section 10.02.

         Each such payment will be made at the specified office of any Paying
Agent, at the option of the Holder of such Coupon, by U.S. dollar cheque drawn
on, or by transfer to a U.S. dollar account maintained by the payee with a bank
in Europe subject in all cases to any applicable fiscal or other laws and
regulations.

         Subject to the foregoing provisions of this Section, each Note
delivered under this Indenture in exchange for or in lieu of any other Note
shall carry the rights to interest accrued and unpaid, and to accrue, which
were carried by such other Note.

         SECTION 3.10     Persons Deemed Owners.

         Subject to the provision of Section 3.14 and except with respect to
any unmatured Coupon, the Company, the Trustee and any agent of the Company or
the Trustee may treat the Person who is the bearer of any Note or Coupon as the
owner of such Note or Coupon for the purpose of receiving payment of principal
of and (subject to Sections 3.05 and 3.09) interest on such Note and for all
other purposes whatsoever, whether or not such Note be overdue, and none of the
Company, the Trustee or any agent of the Company or the Trustee shall be
affected by notice to the contrary.

         SECTION 3.11     Cancellation.

         All Notes surrendered for payment, conversion, redemption or exchange
shall, if surrendered to any Person other than the Trustee, be delivered to the
Trustee and shall be promptly cancelled by it.  The Company may at any time
deliver to the Trustee for cancellation any Notes previously authenticated and
delivered hereunder which the Company may have acquired in any manner
whatsoever, and may deliver to the Trustee (or to any other Person for delivery
to the Trustee) for cancellation any Notes previously authenticated hereunder
which the Company has not issued and sold, and all Notes so delivered shall be
promptly cancelled by the Trustee.  If the Company shall





                                       27
<PAGE>   38
so acquire any of the Notes, however, such acquisition shall not operate as a
redemption or satisfaction of the indebtedness represented by such Notes unless
and until the same are surrendered to the Paying and Conversion Agent for
cancellation.  No Notes shall be authenticated in lieu of or in exchange for
any Notes cancelled as provided in this Section, except as expressly permitted
by this Indenture.  All cancelled Notes held by the Paying and Conversion Agent
shall be disposed of by the Paying and Conversion Agent in accordance with its
customary procedures and certification of their disposal delivered to the
Company unless by Company Order the Company shall direct that cancelled Notes
be returned to it.

         SECTION 3.12     Computation of Interest.

         Interest on the Notes shall be computed on the basis of a 360-day year
of twelve 30-day months and, in the case of an incomplete month, the number of
days elapsed.

         SECTION 3.13     ISIN, CUSIP Or Other Identifying Numbers.

         The Company in issuing the Notes may use "ISIN", "CUSIP" or other
identifying numbers (if then generally in use), and the Trustee shall use ISIN,
CUSIP or other identifying numbers in notices of redemption, conversion or
exchange, and any other notice provided for the benefit of the Noteholders, as
a convenience to Noteholders; provided that any such notice shall state that no
representation is made as to the correctness of such numbers either as printed
on the Notes or as contained in any notice of redemption, conversion or
exchange or other notice.

         SECTION 3.14     Prescription.

         Notes and Coupons will become void unless presented for payment within
periods of ten (10) years (in the case of principal) and five (5) years (in the
case of interest) from the Relevant Date in respect of the Notes or the
Coupons, as the case may be, subject to the provisions of Section 11.09.


                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

         SECTION 4.01     Satisfaction and Discharge of Indenture.

         This Indenture shall upon Company Request cease to be of further
effect (except as to surviving rights of conversion or redemption of Notes
herein expressly provided for and the Company's obligations to the Trustee
pursuant to Section 6.06) and the Trustee, at the expense of the Company, shall
execute proper instruments acknowledging satisfaction and discharge of this
Indenture when:

                 (a)      either:





                                       28
<PAGE>   39
                          (i)      all Notes theretofore authenticated and  
         delivered (other than (1) Notes which have been destroyed, lost,
         mutilated or stolen and which have been replaced or paid as provided in
         Section 3.08 and (2) Notes for whose payment money has theretofore been
         deposited in trust with the Trustee or any Paying Agent or segregated
         and held in trust by the Company and thereafter repaid to the Company
         or discharged from such trust, as provided in Section 10.03) have been
         delivered to the Trustee for cancellation; or

                          (ii)     all such Notes not theretofore delivered to
         the Trustee for cancellation (1) have become due and payable, or (2)
         will become due and payable at their Stated Maturity, within one year,
         or (3) are to be called for redemption within one year under
         arrangements satisfactory to the Trustee for the giving of notice of
         redemption by the Trustee in the name, and at the expense, of the
         Company, and the Company has irrevocably deposited or caused to be
         deposited with the Trustee as trust funds, which may include any amount
         then held in the Segregated Account which the Company designates to the
         Trustee shall be used for such purpose, in trust for the purpose an
         amount sufficient to pay and discharge the entire indebtedness on such
         Notes not theretofore delivered to the Trustee for cancellation, for
         principal and interest to the date of such deposit (in the case of
         Notes which have become due and payable) or to the Stated Maturity or
         Redemption Date, as the case may be;

                 (b)      the Company has paid or caused to be paid all other
         sums payable hereunder by the Company; and

                 (c)      the Company has delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel, each stating that all
         conditions precedent herein provided for relating to the satisfaction
         and discharge of this Indenture have been complied with.

         Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 6.06 and, if money
shall have been deposited with the Trustee pursuant to subclause (ii) of clause
(a) of this Section, the obligations of the Trustee under Section 4.02 and the
last paragraph of Section 10.03 shall survive.

         SECTION 4.02     Application of Trust Money.

         Subject to the provisions of the last paragraph of Section 10.03, all
money deposited with the Trustee pursuant to Section 4.01 shall be held in
trust and applied by it, in accordance with the provisions of the Notes and
this Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal and interest for
whose payment such money has been deposited with the Trustee; but such money
need not be segregated from other funds except to the extent required by law.





                                       29
<PAGE>   40
                                  ARTICLE FIVE

                         EVENTS OF DEFAULT AND REMEDIES

         SECTION 5.01     Events of Default.

         "Event of Default," wherever used herein, means any one of the
following events (whatever the reason for such Event of Default and whether it
shall be occasioned by the provisions of Article Fourteen or be voluntary or
involuntary or be effected by operation of law or pursuant to any judgment,
decree or order of any court or any order, rule or regulation of any
administrative or governmental body) which shall have occurred and is
continuing:

                 (a)      if default is made for a period of five (5) Business
         Days or more in the payment of interest or principal due in respect of
         the Notes or any of them; or

                 (b)      if the Company fails to perform or observe any of its
         other obligations, covenants, conditions or provisions under the
         Notes, this Indenture, the Company's 6.5% Senior Convertible Notes Due
         2000 (the "6.5% European Notes") or the trust indenture pursuant to
         which such 6.5% European Notes were issued, and (except where the
         Trustee shall have certified to the Company in writing that it
         considers such failure to be incapable of remedy in which case no such
         notice or continuation as is hereinafter mentioned will be required)
         such failure continues for the period of 30 calendar days (or such
         longer period as the Trustee may in its absolute discretion permit)
         next following the service by the Trustee on the Company of notice
         requiring the same to be remedied; or

                 (c)      if (i) any other Indebtedness of the Company or any
         Principal Subsidiary becomes due and payable prior to its Stated
         Maturity by reason of an event of default (howsoever defined) or (ii)
         any such Indebtedness of the Company or any Principal Subsidiary is
         not paid when due or, as the case may be, within any applicable grace
         period or (iii) the Company or any Principal Subsidiary fails to pay
         when due (or, as the case may be, within any applicable grace period)
         any amount payable by it under any present or future guarantee for, or
         indemnity in respect of, any Indebtedness of any Person or (iv) any
         security given by the Company or any Principal Subsidiary for any
         Indebtedness of any Person or any guarantee or indemnity of
         Indebtedness of any Person by the Company or any Principal Subsidiary
         becomes enforceable by reason of default in relation thereto and steps
         are taken to enforce such security save in any such case where there
         is a bona fide dispute as to whether the relevant Indebtedness or any
         such guarantee or indemnity as aforesaid shall be due and payable
         (following any applicable grace period), provided that in each such
         case the Indebtedness exceeds in the aggregate U.S.$1,000,000 and in
         each such case such event continues unremedied for a period of 30
         calendar days (or such longer period as the Trustee may in its sole
         discretion consent to in writing upon receipt of written notice from
         the Company); or





                                       30
<PAGE>   41
                 (d)      if the Company or any Principal Subsidiary shall
         generally fail to pay its debts as such debts come due (except debts
         which the Company or such Principal Subsidiary, as the case may be,
         may contest in good faith generally) or shall be declared or
         adjudicated by a competent court to be insolvent or bankrupt, shall
         consent to the entry of an order of relief against it in an
         involuntary bankruptcy case, shall enter into any assignment or other
         similar arrangement for the benefit of its creditors or shall consent
         to the appointment of a custodian (including, without limitation, a
         receiver, liquidator or trustee); or

                 (e)      if a receiver, administrative receiver, administrator
         or other similar official shall be appointed in relation to the
         Company or any Principal Subsidiary or in relation to the whole or a
         substantial part of the undertaking or assets of any of them or a
         distress, execution or other process shall be levied or enforced upon
         or sued out against, or an encumbrancer shall take possession of, the
         whole or a substantial part of the assets of any of them and  in any
         of the foregoing cases is not paid out or discharged within 90
         calendar days (or such longer period as the Trustee may in its
         absolute discretion consent to in writing upon receipt of written
         notice from the Company); or

                 (f)      if the Company or any Principal Subsidiary institutes
         proceedings to be adjudicated a voluntary bankrupt, or shall consent
         to the filing of a bankruptcy proceeding against it, or shall file a
         petition or answer or consent seeking organization under the laws of
         the Federal Bankruptcy Code or any similar applicable U.S. federal,
         state or foreign law, or shall consent to the filing of any such
         petition, or shall consent to the appointment of a receiver or
         liquidator or trustee or assignee (or other similar official) in
         bankruptcy or insolvency of it or its property, or shall make an
         assignment for the benefit of creditors, or shall admit in writing its
         inability to pay its debts generally as they come due; or

                 (g)      if a decree or order by a court having jurisdiction
         in the premises shall have been entered adjudging the Company or any
         Principal Subsidiary a bankrupt or insolvent, or approving as properly
         filed a petition seeking the reorganization of the Company or any
         Principal Subsidiary under the Federal Bankruptcy Code or any other
         similar applicable U.S. federal, state or foreign law, and such decree
         or order shall have continued undischarged or unstayed for a period of
         90 calendar days; or a decree or order of a court having jurisdiction
         in the premises for the appointment of a receiver or liquidator or
         trustee or assignee (or other similar official) in bankruptcy or
         insolvency of the Company or any Principal Subsidiary or of all or
         substantially all of its property, or for the winding up or
         liquidation of its affairs, shall have been entered, and such decree
         or order shall have continued undischarged and unstayed for a period
         of 90 calendar days; or

                 (h)      if a warranty, representation, or other statement
         made by or on behalf of the Company contained in this Indenture, the
         Notes or any certificate or other agreement furnished in compliance
         with such documents is false in any material respect when made and
         (except where the Trustee shall have certified to the Company that it
         considers such falsity to be incapable of remedy, in which case no
         such notice or continuation as is hereinafter





                                       31
<PAGE>   42
         mentioned will be required) such falsity continues for a period of 30
         calendar days (or such longer period as the Trustee may in its
         absolute discretion permit) next following the service by the Trustee
         on the Company of notice requiring the same to be remedied; or

                 (i)      if there is any final judgment or judgments for the
         payment of money exceeding in the aggregate U.S.$1,000,000 outstanding
         against the Company or any Principal Subsidiary which has been
         outstanding for more than 60 calendar days from the date of its entry
         and shall not have otherwise been discharged in full or stayed by
         appeal, bond or otherwise.

         SECTION 5.02     Acceleration of Maturity; Rescission and Annulment.

         If an Event of Default (other than an Event of Default specified in
Section 5.01(f) or 5.01(g)) occurs and is continuing, then and in every such
case the Trustee or the Holders of not less than 25% in principal amount of the
Outstanding Notes may, and the Trustee upon the request of the Holders of not
less than 25% in principal amount of the Outstanding Notes shall, declare the
principal amount of all the Notes to be due and payable immediately, by a
notice in writing to the Company (and to the Trustee if given by Noteholders),
and upon any such declaration such principal amount shall become immediately
due and payable.

         If an Event of Default specified in Section 5.01(f) or 5.01(g) occurs
and is continuing, then the principal amount of all the Notes shall ipso facto
become and be immediately due and payable without any declaration or other act
on the part of the Trustee or any Noteholder.

         At any time after a declaration of acceleration has been made and
before a judgment or decree for payment of the money due has been obtained by
the Trustee as hereinafter in this Article provided, the Holders of a majority
in principal amount of the Outstanding Notes, by written notice to the Company
and the Trustee, may rescind and annul such declaration and its consequences if

                 (a)      the Company has paid or deposited with the Trustee a
         sum sufficient to pay

                          (i)     all overdue interest on all Outstanding
                 Notes,

                          (ii)    all unpaid principal of any Outstanding Notes
                 which has become due otherwise than by such declaration of
                 acceleration, and interest on such unpaid principal at the
                 rate prescribed therefor in the Notes,

                          (iii)   to the extent that payment of such interest
                 is legally enforceable, interest on overdue interest at the
                 rate prescribed therefor in the Notes, and

                          (iv)    all sums paid or advanced by the Trustee
                 hereunder and the reasonable compensation, expenses,
                 disbursements and advances of the Trustee, its agents and
                 counsel; and





                                       32
<PAGE>   43
                 (b)      all Events of Default, other than the non-payment of
         amounts of principal of or interest on Notes which have become due
         solely by such declaration of acceleration, have been cured or waived
         as provided in Section 5.13.

         No such rescission shall affect any subsequent default or impair any
right consequent thereon.

         SECTION 5.03     Collection of Indebtedness and Suits for Enforcement
                          by Trustee.

         The Company covenants that if

                 (a)      default is made in the payment of any instalment of
         interest on any Note when such interest becomes due and payable and
         such default continues for a period of five (5) Business Days, or

                 (b)      default is made in the payment of the principal of
         any Note at the Maturity thereof and such default continues for a
         period of five (5) Business Days,

the Company will, upon demand of the Trustee, pay to the Trustee for the
benefit of the Holders of such Notes, the whole amount then due and payable on
such Notes for principal and interest, and interest on any overdue principal
and, to the extent that payment of such interest shall be legally enforceable,
upon any overdue instalment of interest, at the rate prescribed therefor in the
Notes, and, in addition thereto, such further amount as shall be sufficient to
cover the costs and expenses of collection, including the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel.

         If the Company fails to pay such amounts forthwith upon such demand,
the Trustee, in its own name and as trustee of an express trust, may institute
a judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Company or any other obligor upon the Notes and collect the moneys
adjudged or decreed to be payable in the manner provided by law out of the
property of the Company or any other obligor upon the Notes, wherever situated.

         If an Event of Default occurs and is continuing, the Trustee may in
its discretion proceed to protect and enforce its rights and the rights of the
Noteholders by such appropriate judicial proceedings as the Trustee shall deem
most effectual to protect and enforce any such rights, whether for the specific
enforcement of any covenant or agreement in this Indenture or in aid of the
exercise of any power granted herein, or to enforce any other proper remedy.

         SECTION 5.04     Trustee May File Proofs of Claim.

         In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, arrangement, adjustment, composition or other
judicial proceeding relative to the





                                       33
<PAGE>   44
Company or any other obligor upon the Notes or the property of the Company or
of such other obligor or their creditors, the Trustee (irrespective of whether
the principal of the Notes shall then be due and payable as therein expressed
or by declaration or otherwise and irrespective of whether the Trustee shall
have made any demand on the Company for the payment of overdue principal or
interest) shall be entitled and empowered, by intervention in such proceeding
or otherwise,

                 (a)      to file and prove a claim for the whole amount of
         principal and interest owing and unpaid in respect of the Notes and to
         file such other papers or documents as may be necessary or advisable
         in order to have the claims of the Trustee (including any claim for
         the reasonable compensation, expenses, disbursements and advances of
         the Trustee, its agents and counsel) and of the Noteholders allowed in
         such judicial proceeding, and

                 (b)      to collect and receive any moneys or other property
         payable or deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
similar official in any such judicial proceeding is hereby authorized by each
Noteholder to make such payments to the Trustee and, in the event that the
Trustee shall consent to the making of such payments directly to the
Noteholders, to pay the Trustee any amount due it for the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, and any other amounts due the Trustee under Section 6.06.

         Nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Noteholder any plan
of reorganization, arrangement, adjustment or composition affecting the Notes
or the rights of any Noteholder thereof, or to authorize the Trustee to vote in
respect of the claim of any Noteholder in any such proceeding.

         SECTION 5.05     Trustee May Enforce Claims Without Possession of
                          Notes.

         All rights of action and claims under this Indenture or the Notes may
be prosecuted and enforced by the Trustee without the possession of any of the
Notes or the production thereof in any proceeding relating thereto, and any
such proceeding instituted by the Trustee shall be brought in its own name and
as trustee of an express trust, and any recovery of judgment shall, after
provision for the payment of the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, be for the
ratable benefit of the Noteholders in respect of which such judgment has been
recovered.

         SECTION 5.06     Application of Money Collected.

         Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or interest,
upon presentation of the Notes and the notation thereon of the payment if only
partially paid and upon surrender thereof if fully paid:





                                       34
<PAGE>   45
                 FIRST:  To the payment of all amounts due the Trustee under
         Section 6.06;

                 SECOND:  To the payment of the amounts then due and unpaid for
         principal of and interest on the Notes in respect of which or for the
         benefit of which such money has been collected, ratably, without
         preference or priority of any kind, according to the amounts due and
         payable on such Notes for principal and interest, respectively; and

                 THIRD:  The balance, if any, to the Person or Persons entitled
         thereto.

         SECTION 5.07     Limitation on Suits.

         No Noteholder shall have any right to institute any proceeding,
judicial or otherwise, with respect to this Indenture, or for the appointment
of a receiver or trustee, or for any other remedy hereunder, unless:

                 (a)      such Noteholder has previously given written notice
         to the Trustee of a continuing Event of Default, with a copy of such
         notice to the Company;

                 (b)      the Holders of not less than 25% in principal amount
         of the Outstanding Notes shall have made written request to the
         Trustee to institute proceedings in respect of such Event of Default
         in its own name as Trustee hereunder;

                 (c)      such Noteholder or Noteholders have offered to the
         Trustee reasonable indemnity against the costs, expenses and
         liabilities to be incurred in compliance with such request;

                 (d)      the Trustee for 60 days after its receipt of such
         notice, request and offer of indemnity has failed to institute any
         such proceeding; and

                 (e)      no direction inconsistent with such written request
         has been given to the Trustee during such 60-day period by the Holders
         of a majority or more in principal amount of the Outstanding Notes;

it being understood and intended that no one or more Noteholders shall have any
right in any manner whatever by virtue of, or by availing of, any provision of
this Indenture to affect, disturb or prejudice the rights of any other
Noteholders, or to obtain or to seek to obtain priority or preference over any
other Noteholders or to enforce any right under this Indenture, except in the
manner herein provided and for the equal and ratable benefit of all the
Noteholders.

         SECTION 5.08     Unconditional Right of Holders to Receive Principal
                          and Interest.

         Notwithstanding any other provision in this Indenture, the Holder of
any Note or of any Coupon, as the case may be, shall have the right, which is
absolute and unconditional, to receive





                                       35
<PAGE>   46
payment, as provided herein (including, if applicable, Article Thirteen) and in
such Note of the principal of and (subject to Section 3.09) interest on, such
Note on the respective Stated Maturity or expressed in such Note (or, in the
case of redemption, on the Redemption Date) or Coupon and to institute suit for
the enforcement of any such payment, and such rights shall not be impaired
without the consent of such Holder; provided, that all monies paid by the
Company to the Paying Agent for the payment of principal or interest on any
Note which remain unclaimed at the end of two (2) years after the Stated
Maturity or Redemption Date of such Note will be repaid to the Company and the
Holder of any Note or Coupon shall thereafter have only the rights of a
creditor of the Company or such rights as may be otherwise provided by
applicable law.

         SECTION 5.09     Restoration of Rights and Remedies.

         If the Trustee or any Noteholder has instituted any proceeding to
enforce any right or remedy under this Indenture and such proceeding has been
discontinued or abandoned for any reason, or has been determined adversely to
the Trustee or to such Noteholder, then and in every such case, subject to any
determination in such proceeding, the Company, the Trustee and the Noteholders
shall be restored severally and respectively to their former positions
hereunder and thereafter all rights and remedies of the Trustee and the
Noteholders shall continue as though no such proceeding had been instituted.

         SECTION 5.10     Rights and Remedies Cumulative.

         Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Notes in the last paragraph of
Section 3.08, no right or remedy herein conferred upon or reserved to the
Trustee or to the Noteholders is intended to be exclusive of any other right or
remedy, and every right and remedy shall, to the extent permitted by law, be
cumulative and in addition to every other right and remedy given hereunder or
now or hereafter existing at law or in equity or otherwise.  The assertion or
employment of any right or remedy hereunder, or otherwise, shall not prevent
the concurrent assertion or employment of any other appropriate right or
remedy.

         SECTION 5.11     Delay or Omission Not Waiver.

         No delay or omission of the Trustee or of any Holder of any Note to
exercise any right or remedy accruing upon any Event of Default shall impair
any such right or remedy or constitute a waiver of any such Event of Default or
an acquiescence therein.  Every right and remedy given by this Article or by
law to the Trustee or to the Noteholders may be exercised from time to time,
and as often as may be deemed expedient, by the Trustee or by the Noteholders,
as the case may be.

         SECTION 5.12     Control by Noteholders.

         The Holders of not less than a majority in aggregate principal amount
of the Outstanding Notes shall have the right to direct the time, method and
place of conducting any proceeding for any





                                       36
<PAGE>   47
remedy available to the Trustee, or exercising any trust or power conferred on
the Trustee, provided that in each case:

                 (a)      such direction shall not be in conflict with any rule
         of law or with this Indenture,

                 (b)      the Trustee may take any other action deemed proper
         by the Trustee which is not inconsistent with such direction, and

                 (c)      the Trustee need not take any action which might
         involve it in personal liability or be unjustly prejudicial to the
         Noteholders not joining in such direction.

         SECTION 5.13     Waiver of Past Defaults.

         Subject to Section 5.02, the Holders of not less than a majority in
principal amount of the Outstanding Notes may on behalf of the Holders of all
the Notes waive any past default hereunder and its consequences, except a
default

                 (a)      in respect of the payment of the principal of or
         interest on any Note, or

                 (b)      in respect of a covenant or provision hereof which
         under Article Nine cannot be modified or amended without the consent
         of the Holder of each Outstanding Note affected.

         Upon any such waiver, such default shall cease to exist, and any Event
of Default arising therefrom shall be deemed to have been cured, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or Event of Default or impair any right consequent thereon.

         SECTION 5.14     Waiver of Stay or Extension Laws.

         The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever
claim or take the benefit or advantage of, any stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it
may lawfully do so) hereby expressly waives all benefit or advantage of any
such law and covenants that it will not hinder, delay or impede the execution
of any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law had been enacted.

         SECTION 5.15     Undertaking for Costs.

         All parties to this Indenture agree, and each Holder of any Note by
such Noteholder's acceptance thereof shall be deemed to have agreed, that any
court may in its discretion require, in





                                       37
<PAGE>   48
any suit for the enforcement of any right or remedy under this Indenture, or in
any suit against the Trustee for any action taken, suffered or omitted by it as
Trustee, the filing by any party litigant in such suit of an undertaking to pay
the costs of such suit, and that such court may in its discretion assess
reasonable costs, including reasonable attorneys' fees, against any party
litigant in such suit, having due regard to the merits and good faith of the
claims or defenses made by such party litigant; but the provisions of this
Section shall not be deemed to require any court to require an undertaking or
to make such an assessment in any suit instituted by the Company except against
the Trustee.


                                  ARTICLE SIX

                                  THE TRUSTEE

         SECTION 6.01     Notice of Defaults.

         Within 90 days after the occurrence of any Default hereunder, the
Trustee shall publish notice of such Default hereunder known to the Trustee,
unless such Default shall have been cured or waived; provided, however, that,
except in the case of a Default in the payment of the principal of or interest
on any Note, the Trustee shall be protected in withholding such notice if and
so long as the board of directors, the executive committee or a trust committee
of directors and/or Responsible Officers of the Trustee in good faith
determines that the withholding of such notice is in the interest of the
Noteholders.

         SECTION 6.02     Certain Rights of Trustee.

                 (a)      The Trustee may request and rely and shall be
         protected in acting or refraining from acting upon any Extraordinary
         Resolution, Act, Notice or other resolution, certificate, statement,
         instrument, opinion, report, notice, request, direction, consent,
         order, bond, debenture, note, other evidence of indebtedness or other
         paper or document believed by it to be genuine and to have been signed
         or presented by the proper party or parties.

                 (b)      Any request or direction of the Company mentioned
         herein shall be sufficiently evidenced by a Company Request or Company
         Order and any resolution of the Board of Directors may be sufficiently
         evidenced by a Board Resolution.

                 (c)      Whenever in the administration of this Indenture the
         Trustee shall deem it desirable that a matter be proved or established
         prior to taking, suffering or omitting any action hereunder, the
         Trustee (unless other evidence be herein specifically prescribed) may,
         in the absence of bad faith on its part, rely upon an Officers'
         Certificate.

                 (d)      The Trustee may consult with counsel and the written
         advice of such counsel or any Opinion of Counsel shall be full and
         complete authorization and protection in respect of any action taken,
         suffered or omitted by it hereunder in good faith and in reliance
         thereon.





                                       38
<PAGE>   49
                 (e)      The Trustee shall be under no obligation to exercise
         any of the rights or powers vested in it by this Indenture at the
         request or direction of any of the Noteholders pursuant to this
         Indenture, unless such Noteholders shall have offered to the Trustee
         reasonable security or indemnity against the costs, expenses
         (including reasonable fees of Trustee's counsel), and liabilities
         which might be incurred by it in compliance with such request or
         direction.

                 (f)      The Trustee shall not be bound to make any
         investigation into the facts or matters stated in any Extraordinary
         Resolution, Act, Notice or other resolution, certificate, statement,
         instrument, opinion, report, notice, request, direction, consent,
         order, bond, debenture, note, other evidence of indebtedness or other
         paper or document, but the Trustee, in its discretion, may make such
         further inquiry or investigation into such facts or matters as it may
         see fit, and, if the Trustee shall determine to make such further
         inquiry or investigation, it shall be entitled to examine the books,
         records and premises of the Company, personally or by agent or
         attorney.

                 (g)      The Trustee may execute any of the trusts or powers
         hereunder or perform any duties hereunder either directly or by or
         through agents or attorneys and the Trustee shall not be responsible
         for any misconduct or negligence on the part of any agent or attorney
         appointed with due care by it hereunder.

                 (h)      The Trustee shall not be liable for any action taken,
         suffered or omitted by it in good faith and believed by it to be
         authorized or within the discretion or rights or powers conferred upon
         it by this Indenture.

                 (i)      The permissive right of the Trustee to take or
         refrain from taking any actions enumerated in this Indenture shall not
         be confused as a duty and the Trustee shall not be answerable in such
         actions other than for its own negligence or wilful misconduct.

         The Trustee shall not be required to expend or risk its own funds or
otherwise incur any financial liability in the performance of any of its duties
hereunder, or in the exercise of any of its rights or powers if it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.

         SECTION 6.03     Trustee Not Responsible for Recitals or Issuance of
                          Notes.

         The recitals contained herein in the Notes, except for the Trustee's
certificates of authentication, and in the Coupons, shall be taken as the
statements of the Company, and the Trustee assumes no responsibility for their
correctness.  The Trustee makes no representations as to the validity or
sufficiency of this Indenture or of the Notes or the Coupons or of the
Conversion Shares, except that the Trustee represents that it is duly
authorized to execute and deliver this Indenture, authenticate the Notes and
perform its obligations hereunder.  The Trustee shall not be accountable for
the use or application by the Company of Notes or the proceeds thereof.





                                       39
<PAGE>   50
         SECTION 6.04     May Hold Notes.

         The Trustee, any Paying Agent, any Conversion Agent, any
Authenticating Agent or any other agent of the Company or of the Trustee, in
its individual or any other capacity, may become the owner or pledgee of Notes
and the Coupons and may otherwise deal with the Company with the same rights it
would have if it were not Trustee, Paying Agent, Conversion Agent, any
Authenticating Agent or such other agent.

         SECTION 6.05     Money Held in Trust.

         Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law.  The Trustee shall be
under no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.

         SECTION 6.06     Compensation and Reimbursement.

         The Company agrees:

                 (a)      to pay to the Trustee from time to time reasonable
         compensation for all services rendered by it hereunder (which
         compensation shall not be limited by any provision of law in regard to
         the compensation of a trustee of an express trust);

                 (b)      except as otherwise expressly provided herein, to
         reimburse the Trustee upon its request for all reasonable expenses,
         disbursements and advances incurred or made by the Trustee in
         accordance with any provision of this Indenture (including the
         reasonable compensation and the expenses and disbursements of its
         agents and counsel), except any such expense, disbursement or advance
         as may be attributable to its negligence, bad faith or wilful
         misconduct; and

                 (c)      to indemnify the Trustee for, and to hold it harmless
         against, any loss, liability or expense incurred without negligence or
         bad faith on its part, arising out of or in connection with the
         acceptance or administration of this trust, including the costs and
         expenses of defending itself against any claim or liability in
         connection with the exercise or performance of any of its powers or
         duties hereunder.

         When the Trustee incurs expenses or renders service in connection with
an Event of Default specified in Section 5.01 (f) or Section 5.01 (g), the
expenses (including the reasonable charges of its counsel) and the compensation
for the services are intended to constitute expenses of the administration
under any applicable federal, state or foreign bankruptcy, insolvency or other
similar law.

         As security for the performance of the obligations of the Company
under this Section, the Trustee shall have a claim prior to the Notes upon all
property and funds held or collected by the





                                       40
<PAGE>   51
Trustee as such, except funds held in trust for the payment of principal of or
interest on particular Notes.

         The provision of this Section shall survive the termination of this
Indenture or the earlier resignation or removal of the Trustee.  Any Paying
Agent or Authenticating Agent appointed hereunder shall be entitled to the
benefits of Section 6.06 (c) as if the indemnity set forth therefor were
specifically afforded to such Paying Agent or Authenticating Agent.

         SECTION 6.07     Corporate Trustee Required; Eligibility.

         There shall at all times be a Trustee hereunder which shall be
eligible to act as Trustee and shall have a combined capital and surplus of at
least $50,000,000.  If such corporation publishes reports of condition at least
annually, pursuant to law or to the requirements of federal, state, territorial
or District of Colombia supervising or examining authority, then for the
purposes of this Section, the combined capital and surplus of such corporation
shall be deemed to be its combined capital and surplus as set forth in its most
recent report of condition so published.  If at any time the Trustee shall
cease to be eligible in accordance with the provisions of this Section, it
shall resign immediately in the manner and with the effect hereinafter
specified in this Article.

         SECTION 6.08     Resignation and Removal; Appointment of Successor.

                 (a)      No resignation or removal of the Trustee and no
         appointment of a successor Trustee pursuant to this Article shall
         become effective until the acceptance of appointment by the successor
         Trustee in accordance with the applicable requirements of Section
         6.09.

                 (b)      The Trustee may resign at any time by giving written
         notice thereof to the Company.  If the instrument of acceptance by a
         successor Trustee required by Section 6.09 shall not have been
         delivered to the Trustee within thirty (30) days after the giving of
         such notice of resignation, the resigning Trustee may petition any
         court of competent jurisdiction for the appointment of a successor
         Trustee.

                 (c)      The Trustee may be removed at any time by Act of the
         Holders of not less than a majority in principal amount of the
         Outstanding Notes, delivered to the Trustee and to the Company.

                 (d)      If at any time:

                          (i)     the Trustee shall cease to be eligible under
                 Section 6.07 and shall fail to resign after written request
                 therefor by the Company or by any Noteholder who has been a
                 bona fide Holder of a Note for at least six (6) months, or

                          (ii)    the Trustee shall become incapable of acting
                 or shall be adjudged a bankrupt or insolvent or a receiver of
                 the Trustee or of its property shall be appointed





                                       41
<PAGE>   52
                 or any public officer shall take charge or control of the
                 Trustee or of its property or affairs for the purpose of
                 rehabilitation, conservation or liquidation, or

                          (iii)   the Trustee shall fail or refuse to timely
                 carry out and discharge its duties hereunder,

         then, in any such case, (i) the Company, by a Board Resolution, may
         remove the Trustee, or (ii) any Noteholder who has been a bona fide
         Holder of a Note for at least six (6) months may, on behalf of such
         Noteholder and all others similarly situated, petition any court of
         competent jurisdiction for the removal of the Trustee and the
         appointment of a successor Trustee.

                 (e)      If the Trustee shall resign, be removed or become
         incapable of acting, or if a vacancy shall occur in the office of
         Trustee for any reason, the Company, by a Board Resolution, shall
         promptly appoint a successor Trustee.  If, within one year after such
         resignation, removal or incapability, or the occurrence of such
         vacancy, a successor Trustee shall be appointed by Act of the Holders
         of a majority in principal amount of the Outstanding Notes delivered
         to the Company and the retiring Trustee, the successor Trustee so
         appointed shall, forthwith upon its acceptance of such appointment,
         become the successor Trustee and supersede the successor Trustee
         appointed by the Company.  If no successor Trustee shall have been so
         appointed by the Company or the Noteholders and accepted appointment
         in the manner hereinafter provided, any Noteholder who has been a bona
         fide Holder of a Note for at least six (6) months may, on behalf of
         such Noteholder and all others similarly situated, petition any court
         of competent jurisdiction for the appointment of a successor Trustee.

                 (f)      The Company shall give notice of each resignation and
         each removal of the Trustee and each appointment of a successor
         Trustee to the Noteholders in the manner provided for in Section 1.08.
         Each notice shall include the name of the successor Trustee and the
         address of its Corporate Trust Office.

         SECTION 6.09     Acceptance of Appointment by Successor.

         Every successor Trustee appointed hereunder shall execute, acknowledge
and deliver to the Company and to the retiring Trustee an instrument accepting
such appointment, and thereupon the resignation or removal of the retiring
Trustee shall become effective and such successor Trustee, without any further
act, deed or conveyance, shall become vested with all the rights, powers,
trusts and duties of the retiring Trustee; but, on request of the Company or
the successor Trustee, such retiring Trustee shall, upon payment of its
charges, execute and deliver an instrument transferring to such successor
Trustee all the rights, powers and trusts of the retiring Trustee and shall
duly assign, transfer and deliver to such successor Trustee all property and
money held by such retiring Trustee hereunder, including any funds held in the
Segregated Account, whether or not invested.  Upon request of any such
successor Trustee, the Company shall execute any and all instruments for





                                       42
<PAGE>   53
more fully and certainly vesting in and confirming to such successor Trustee
all such rights, powers and trusts.

         No successor Trustee shall accept its appointment unless at the time
of such acceptance such successor Trustee shall be qualified and eligible under
this Article.

         SECTION 6.10     Merger, Conversion, Consolidation or Succession to
                          Business.

         Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which the Trustee shall be a party, or
any corporation succeeding to all or substantially all of the corporate trust
business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Article, without the execution or filing of any paper or any further act on the
part of any of the parties hereto.  In case any Notes shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Notes so authenticated with the same effect
as if such successor Trustee had itself authenticated such Notes; and in case
at that time any of the Notes shall not have been authenticated, any successor
Trustee may authenticate such Notes either in the name of any predecessor
hereunder or in the name of the successor Trustee; and in all such cases such
certificates shall have the full force which it is anywhere in the Notes or in
this Indenture provided that the certificate of the Trustee shall have;
provided, however, that the right to adopt the certificate of authentication of
any predecessor Trustee or to authenticate Notes in the name of any predecessor
Trustee shall apply only to its successor or successors by merger, conversion
or consolidation.

         SECTION 6.11     Certain Duties and Responsibilities.

                 (a)      Except during the continuance of an Event of Default
         with respect to the Notes,

                          (i)     the Trustee undertakes to perform such duties
                 and only such duties with respect to the Notes as are
                 specifically set forth in this Indenture, and no implied
                 covenants or obligations with respect to the Notes shall be
                 read into this Indenture against the Trustee; and

                          (ii)    in the absence of bad faith on its part, the
                 Trustee may conclusively rely as to the truth of the
                 statements and the correctness of the opinions expressed
                 therein, upon certificates or opinions furnished to the
                 Trustee and conforming to the requirements of this Indenture;
                 but in the case of any such certificates or opinions which by
                 any provision hereof are specifically required to be furnished
                 to the Trustee, the Trustee shall be under a duty to examine
                 the same to determine whether or not they conform to the
                 requirements of this Indenture, but not to verify the contents
                 thereof.





                                       43
<PAGE>   54
                 (b)      In case an Event of Default has occurred and is
         continuing of which a Responsible Officer of the Trustee has actual
         knowledge, the Trustee shall exercise such of the rights and powers
         vested in it by this Indenture with respect to the Notes, and use the
         same degree of care and skill in their exercise, as a prudent person
         would exercise or use under the circumstances in the conduct of such
         person's own affairs.

                 (c)      No provision of this Indenture shall be construed to
         relieve the Trustee from liability for its own negligent action, its
         own negligent failure to act, or its own wilful misconduct, except
         that:

                          (i)     this Subsection shall not be construed to
                 limit the effect of Subsection (a) of this Section;

                          (ii)    the Trustee shall not be liable for any error
                 of judgment made in good faith by a Responsible Officer,
                 unless it shall be proved that the Trustee was negligent in
                 ascertaining the pertinent facts;

                          (iii)   the Trustee shall not be liable with respect
                 to any action taken or omitted to be taken by it in good faith
                 in accordance with the direction of the Noteholders, given as
                 provided in Section 5.12, relating to the time, method and
                 place of conducting any proceeding for any remedy available to
                 the Trustee, or exercising any trust or power conferred upon
                 the Trustee, under this Indenture; and

                          (iv)    no provision of this Indenture shall require
                 the Trustee to expend or risk its own funds or otherwise incur
                 any financial liability in the performance of any of its
                 duties hereunder, or in the exercise of any of its rights or
                 powers, if it shall have reasonable grounds for believing that
                 repayment of such funds or adequate indemnity against such
                 risk or liability is not reasonably assured to it.

                 (d)      Whether or not therein expressly so provided, every
         provision of this Indenture relating to the conduct or affecting the
         liability of or affording protection to the Trustee shall be subject
         to the provisions of this Section.

         SECTION 6.12     Segregated Account.

                 (a)      On the Closing Date or the day immediately following
         the Closing Date the net proceeds received from the sale of the Notes
         shall be transferred to the Segregated Account to be held until such
         time as such proceeds may be distributed to the Company in accordance
         with this Section or used by the Company in accordance with the
         provisions of Article Four and Article Thirteen hereof.

                 (b)      On the Closing Date or the date immediately following
         the Closing Date, the Company will establish the Segregated Account
         with the Trustee on behalf of the Company.





                                       44
<PAGE>   55
         The Trustee shall have a duty to invest the funds held in the
         Segregated Account from time to time in accordance with any Company
         Request received by the Trustee from the Company from time to time.
         Funds held by the Trustee will be invested and reinvested in Permitted
         Investments as directed in writing by the Company.  Interest earned on
         investments made with the funds in the Segregated Account from time to
         time and on deposit in the Segregated Account will be held for the
         account of the Company and also invested in accordance with the
         instructions provided by the Company from time to time in a Company
         Order in Permitted Investments.  The Trustee will distribute such
         earnings to the Company upon written request.

                 (c)      Upon conversion of any Note, whether represented by
         an interest in the Global Note or a Bearer Note, into Conversion
         Shares pursuant to Article Twelve, from time to time, the Company may
         request that the Trustee make a distribution to the Company of funds
         held in the Segregated Account in an amount equal to the principal
         amount of such Note.  The balance of the principal amount for such
         Note remaining on deposit in the Segregated Account at the Conversion
         Date shall be distributed to the Company without regard to the then
         current Asset Value Coverage Ratio; provided, however, that no such
         distribution shall be made if an Event of Default shall have occurred
         and be continuing.  In addition, the Company may from time to time
         request that the Trustee distribute to the Company any other funds
         held in the Segregated Account.  The Trustee shall distribute to the
         Company such funds held in the Segregated Account to the extent that
         the Company on the date of such request provides the documents
         specified in Section 6.12(d) to the Trustee.

                 (d)      Upon making any written request to the Trustee for a
         distribution of a portion of the funds, including any earnings
         thereon, held in the Segregated Account, the Company will present to
         the Trustee a certificate from the chief financial officer of the
         Company including items (a) through (d) of Section 1.04 and in the
         form set forth as Exhibit D stating that (i) the required Asset Value
         Coverage Ratio has (A) been met in accordance with Section 10.13 as of
         the date of such request and (B) will be met, following distribution
         of such funds from the Segregated Account (which certification may be
         based on assets subject to the Asset Value Coverage Ratio acquired
         subsequent to the end of the most recent fiscal year), (ii) to the
         knowledge of the Company no Event of Default with respect to any of
         the Notes has occurred and is continuing at the date of such
         certificate (except in the case of funds to be immediately deposited
         with Trustee pursuant to Section 4.01), and (iii) requesting a
         specific distribution.  Such chief financial officer's certificate
         shall be accompanied by Independent Reserve Reports.  Upon receipt of
         the chief financial officer's certificate and the Independent Reserve
         Reports, the Trustee shall distribute the corresponding portion of the
         funds held in the Segregated Account to the Company as requested;
         provided that any chief financial officer's certificate delivered to
         the Trustee pursuant to Article Four or Article Thirteen shall not be
         required to contain the statements set forth in subparts (i) and (ii)
         above.  The Trustee shall have no obligation or liability to verify
         the truthfulness or accuracy of the chief financial officer's
         certificate or the Independent Reserve Reports presented and likewise
         will have no liability for relying





                                       45
<PAGE>   56
         exclusively on such documents to verify the permissibility of a
         distribution of funds from the Segregated Account to the Company as
         requested.

                 (e)      At any time after Maturity, the Company may request
         that the Trustee distribute the funds held in the Segregated Account
         to the Company.  Upon making any such request, the Company shall
         present an Officer's Certificate including items (a) through (d) of
         Section 1.04 and stating that all principal and interest due at any
         time on the Notes up to and through Maturity has been paid to the
         Trustee.

                 (f)      The Company may at any time and from time to time
         deposit funds in the Segregated Account in order to meet the required
         Asset Value Coverage Ratio or to supplement or replace any Required
         Assets designated in the most recent chief financial officer's
         certificate as part of the Asset Value Coverage Ratio with other or
         additional assets eligible for inclusion as Required Assets, provided
         that prior to any such change in the allocation of Required Assets,
         the Company shall provide a substitute chief financial officer's
         certificate evidencing that the required Asset Value Coverage Ratio
         shall be met after such deposit, supplement or replacement is
         effective, as the case may be.

         SECTION 6.13     Meetings of Noteholders.

                 (a)      The Trustee or the Noteholders may convene a meeting
         at any time and from time to time to consider any matter affecting the
         interests of the Trustee or the Holders of the Notes, including the
         modification of the Terms and Conditions or this Indenture and to
         make, give or take any request, demand, authorization, direction,
         notice, consent, waiver or other action provided by this Indenture to
         be made, given or taken by Holders of the Notes.

                 (b)      The Trustee may at any time call a meeting of the
         Holders of the Notes for any purpose specified in Section 6.13(a), to
         be held at such time and at such place in the Borough of Manhattan,
         The City of New York, or in the City of London, England, as the
         Trustee shall determine.  Notice of every meeting of the Holders of
         the Notes, setting forth the time and the place of such meeting and in
         general terms the action proposed to be taken at such meeting, shall
         be given in the manner provided in Section 1.08, not less than 21 nor
         more than 180 days prior to the date fixed for the meeting.

                 (c)      In case at any time the Company, pursuant to a Board
         Resolution, or the Holders of at least 25% in aggregate principal
         amount of the Outstanding Notes shall have requested the Trustee to
         call a meeting of the Holder of the Notes for any purpose other than
         specified in Section 6.13(a), by written request setting forth in
         reasonable detail the action proposed to be taken at the meeting, and
         the Trustee shall not have made the first publication of the notice of
         such meeting within 21 days after receipt of such request or shall not
         thereafter proceed to cause the meeting to be held as provided herein,
         then the Company or the Holders of the Notes in the amount specified,
         as the case may be, may determine the time and the place in the
         Borough of Manhattan, The City of New York, or in the City of London,





                                       46
<PAGE>   57
         England, for such meeting and may call such meeting for such purposes
         by giving notice thereof as provided in Section 1.08.

                 (d)      To be entitled to vote at any meeting of Holders of
         the Notes, a Person shall be (i) a Holder of one or more Outstanding
         Notes, or (ii) a Person appointed by an instrument in writing as proxy
         for a Holder or Holders of one or more Outstanding Notes by such
         Holder or Holders.  The only Persons who shall be entitled to be
         present or to speak at any meeting of Noteholders shall be the Persons
         entitled to vote at such meeting and their counsel, any
         representatives of the Trustee and the Company, and their respective
         counsel.

                 (e)      The quorum at any meeting for passing any
         Extraordinary Resolution will be one or more Persons present holding
         or representing 50% or more in principal amount of the Outstanding
         Notes as of the date of the meeting, or at any adjourned such meeting
         one or more Persons present whatever the principal amount of the Notes
         held or represented by such Person and the vote required for passing
         an Extraordinary Resolution at such meeting will be not less than a
         majority of the principal amount of the Outstanding Notes and
         represented at such meeting or adjournment thereof; provided, that at
         any meeting, the business of which includes the modification of  the
         provisions of the Terms and Conditions (including Condition 8) and the
         provisions of this Indenture, the necessary quorum and vote required
         for passing an Extraordinary Resolution will be one or more Persons
         present holding or representing not less than a majority, or at any
         adjourned such meeting not less than one-third, of the principal
         amount of the Outstanding Notes.  An Extraordinary Resolution passed
         at any meeting of the Holders of the Notes will be binding on all
         Holders of the Notes, whether or not such Noteholders are present at
         the meeting, and on the Holders of all Coupons.

                 (f)      The Trustee may agree, without the consent of the
         Holders of the Notes or the Coupons, to any modification (subject to
         certain exceptions) of, or to the waiver or authorization of any
         breach or proposed breach of, any of the Terms and Conditions or any
         of the provisions of this Indenture which is not, in the opinion of
         the Trustee materially prejudicial to the interests of the Holders of
         the Notes or the Coupons or which is of a formal, minor or technical
         nature or to correct a manifest error.

         SECTION 6.14     Authenticating Agents.

         The Principal Paying and Conversion Agent may authenticate the Global
Note, the Temporary Notes and the Notes, as the Trustee's Authenticating Agent.
The Trustee may, with the written consent of the Company, appoint an additional
Authenticating Agent acceptable to the Company with respect to the Notes which
shall be authorized to act on behalf of the Trustee to authenticate Notes
issued upon exchange or substitution pursuant to this Indenture.

         Notes authenticated by an Authenticating Agent shall be entitled to 
the benefits of this Indenture and shall be valid and obligatory for all 
purposes as if authenticated by the Trustee





                                       47
<PAGE>   58
hereunder, and every reference in this Indenture to the authentication and
delivery of Notes by the Trustee or the Trustee's certificate of authentication
shall be deemed to include authentication and delivery on behalf of the Trustee
by an Authenticating Agent and a certificate of authentication executed on
behalf of the Trustee by an Authenticating Agent. The Notes shall have endorsed
thereon the certificate of authentication set forth in Exhibits A and B hereto.
Each Authenticating Agent shall be subject to acceptance by the Company and
shall at all times be a corporation organized and doing business under the laws
of the United States of America, any state thereof, the District of Colombia,
Luxembourg, or England and Wales authorised under such laws to act as
Authenticating Agent and subject to supervision or examination by government or
other fiscal authority.  If at any time an Authenticating Agent shall cease to
be eligible in accordance with the provisions of this Section 6.14, such
Authenticating Agent shall resign immediately in the manner and with the effect
specified in this Section 6.14.

         Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent; provided  such corporation shall be otherwise eligible
under this Section 6.14, without the execution or filing of any paper or any
further act on the part of the Trustee or the Authenticating Agent.

         An Authenticating Agent may resign at any time by giving written
notice thereof to the Trustee and to the Company.  The Trustee may at any time
terminate the agency of an Authenticating Agent by giving written notice
thereof to such Authenticating Agent and to the Company.  Upon receiving such a
notice of resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section 6.14, the Trustee may appoint a successor
Authenticating Agent which shall be subject to acceptance by the Company.

         The Company agrees to pay to each Authenticating Agent from time to
time reasonable compensation for this service under Section 6.14.


                                 ARTICLE SEVEN

                   NOTEHOLDERS' LISTS AND REPORTS BY COMPANY

         SECTION 7.01     Disclosure of Names and Addresses of Noteholders.

         Every Noteholder, by receiving and holding the same, agrees with the
Company and the Trustee that neither the Company nor the Trustee nor any agent
of either of them shall be held accountable by reason of the disclosure of any
such information as to the names and addresses of the Noteholders regardless of
the source from which such information was derived.





                                       48
<PAGE>   59
         SECTION 7.02     Reports by Company.

         The Company shall:

                 (a)      file with the Trustee, within 15 days after the
         Company is required to file the same with the Commission, copies of
         the annual reports and of the information, documents and other reports
         (or copies of such portions of any of the foregoing as the Commission
         may from time to time by rules and regulations prescribe) which the
         Company may be required to file with the Commission pursuant to
         Section 13 or Section 15(d) of the Exchange Act; or, if the Company is
         not required to file information, documents or reports pursuant to
         either of said Sections, then, on the 120th day following the initial
         issuance of the Notes and annually thereafter, it shall file with the
         Trustee, in accordance with rules and regulations prescribed from time
         to time by the Commission, such of the supplementary and periodic
         information, documents and reports which may be required pursuant to
         Section 13 of the Exchange Act in respect of a security listed and
         registered on a national securities exchange as may be prescribed from
         time to time in such rules and regulations;

                 (b)      file with the Trustee, in accordance with rules and
         regulations prescribed from time to time by the Commission, such
         additional information, documents and reports with respect to
         compliance by the Company with the conditions and covenants of this
         Indenture as may be required from time to time by such rules and
         regulations; and

                 (c)      file with the Trustee within 90 days after the end of
         its fiscal year, a copy of one or more Independent Reserve Reports
         dated as of the end of such fiscal year.


                                  ARTICLE EIGHT

             CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER, OR LEASE

         SECTION 8.01     Company May Consolidate, Etc., Only on Certain Terms.

         The Company will not merge or consolidate with or sell, convey,
transfer or lease or otherwise dispose of all or substantially all of its
assets substantially as an entirety to any Person, unless:

                 (a)      the Company shall have complied with its obligations
         under Section 10.17 (if applicable);

                 (b)      either (i) the Company shall be the surviving Person
         or (ii) the Person (if other than the Company) formed by such
         consolidation or into which the Company is merged or the Person which
         acquired by conveyance or transfer, or which leases, the properties
         and assets of the Company substantially as an entirety (1) shall be a
         Person organized and validly





                                       49
<PAGE>   60
         existing under the laws of the United States of America, any state
         thereof or the District of Colombia and (2) shall expressly assume, by
         a trust indenture supplemental hereto, executed and delivered to the
         Trustee, in form satisfactory to the Trustee, the Company's obligation
         for the due and punctual payment of the principal of and interest on
         all the Notes and the performance and observance of every covenant of
         this Indenture on the part of the Company to be performed or observed;

                 (c)      immediately after giving effect to such transaction
         (and treating any Indebtedness which becomes an obligation of the
         Company in connection with or as a result of such transaction as
         having been incurred at the time of such transaction), no Default or
         Event of Default shall have occurred and be continuing; and

                 (d)      the Company or such Person shall have delivered to
         the Trustee an Officers' Certificate and an Opinion of Counsel, each
         stating that such consolidation, merger, conveyance, transfer or lease
         and, if a supplemental indenture is required in connection with such
         transaction, such supplemental indenture complies with Article 9 and
         that all conditions precedent herein provided for relating to such
         transaction have been complied with.

         SECTION 8.02     Successor Substituted.

         Upon any consolidation of the Company with or merger of the Company
with or into any other Person or any conveyance, transfer or lease of the
properties and assets of the Company substantially as an entirety to any Person
in accordance with Section 8.01, the successor Person formed by such
consolidation or into which the Company is merged or to which such conveyance,
transfer or lease is made shall succeed to, and be substituted for, and may
exercise every right and power of, the Company under this Indenture with the
same effect as if such successor Person had been named as the Company herein,
and in the event of any such conveyance or transfer, the Company (which term
shall for this purpose mean the Person named as the "Company" in the first
paragraph of this Indenture or any successor Person which shall theretofore
become such in the manner described in Section 8.01), except in the case of a
lease, shall be discharged of all obligations and covenants under this
Indenture and the Notes and may be dissolved and liquidated.


                                  ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

         SECTION 9.01     Supplemental Indentures Without Consent of
                          Noteholders.

         Without the consent of any Noteholders, the Company, when authorized
by a Board Resolution, and the Trustee, at any time and from time to time, may
enter into one or more indentures supplemental hereto, in form satisfactory to
the Trustee, for any of the following purposes:





                                       50
<PAGE>   61
                 (a)      to evidence the succession of another Person to the
         Company and the assumption by any such successor of the covenants of
         the Company contained herein and in the Notes; or

                 (b)      to add to the covenants of the Company for the
         benefit of the Noteholders or to surrender any right or power herein
         conferred upon the Company; or

                 (c)      to add any additional Events of Default; or

                 (d)      to evidence and provide for the acceptance of
         appointment hereunder by a successor Trustee pursuant to the
         requirements of Section 6.09; or

                 (e)      to cure any ambiguity, to correct or supplement any
         provision herein which may be inconsistent with any other provision
         herein, or to make any other provisions with respect to matters or
         questions arising under this Indenture; provided that such action
         shall not adversely affect the interests of the Noteholders in any
         material respect; or

                 (f)      to secure the Notes pursuant to the requirements of
         Section 10.11 or otherwise.

         SECTION 9.02     Supplemental Indentures with Consent of Noteholders.

         With the consent of the Noteholders of not less than a majority in
principal amount of the Outstanding Notes, by Act of said Noteholders delivered
to the Company and the Trustee, the Company, when authorized by a Board
Resolution, and the Trustee may enter into an indenture or indentures
supplemental hereto for the purpose of adding any provisions to or changing in
any manner or eliminating any of the provisions of this Indenture or of
modifying in any manner the rights of the Noteholders under this Indenture;
provided, that no such supplemental indenture shall, without the consent of the
Holder of each Outstanding Note affected thereby:

                 (a)      change the Stated Maturity of the principal of, or
         any instalment of principal of or interest on, any Note, or reduce the
         principal amount thereof or the rate of interest thereon, or change
         the coin or currency in which any Note or the interest thereon is
         payable, or impair the right to institute suit for the enforcement of
         any such payment after the Stated Maturity thereof (or, in the case of
         redemption, on or after the Redemption Date), or

                 (b)      reduce the percentage in principal amount of the
         Outstanding Notes, the consent of whose Holders is required for any
         such supplemental indenture, or the consent of whose Holders is
         required for any waiver of compliance with certain provisions of this
         Indenture or certain defaults hereunder and their consequences
         provided for in this Indenture, or





                                       51
<PAGE>   62
                 (c)      modify any of the provisions of this Section or
         Section 5.13, except to increase any such percentage or to provide
         that certain other provisions of this Indenture cannot be modified or
         waived without the consent of the Holder of each Outstanding Note
         affected thereby; provided, that this clause shall not be deemed to
         require the consent of any Noteholder with respect to changes in the
         references to "the Trustee" and concomitant changes in this Section
         and elsewhere, or the deletion of this proviso, in accordance with the
         requirements of Section 6.09 and 9.01(d), or

                 (d)      modify any of the provisions of Section 10.11 or any
         of the provisions of this Indenture relating to the subordination of
         the Note in a manner adverse to the Holders thereof.

         It shall not be necessary for any Act of Noteholders under this
Section to approve the particular form of any proposed supplemental indenture,
but it shall be sufficient if such Act shall approve the substance thereof.

         SECTION 9.03     Execution of Supplemental Indentures.

         In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby
of the trusts created by this Indenture, the Trustee shall be entitled to
receive, and (subject to Section 6.11) shall be fully protected in relying
upon, an Opinion of Counsel stating that the execution of such supplemental
indenture is authorized or permitted by this Indenture.  The Trustee may, but
shall not be obligated to, enter into any such supplemental indenture which
affects the Trustee's own rights, duties or immunities under this Indenture or
otherwise.

         SECTION 9.04     Effect of Supplemental Indentures.

         Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every
Holder of Notes theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

         SECTION 9.05     Reference in Notes to Supplemental Indentures.

         Notes authenticated and delivered after the execution of any
supplemental indenture pursuant to this Article may, and shall if required by
the Trustee, bear a notation in form approved by the Trustee as to any matter
provided for in such supplemental indenture.  If the Company shall so
determine, new Notes so modified as to conform, in the opinion of the Trustee
and the Company, to any such supplemental indenture may be prepared and
executed by the Company and authenticated and delivered by the Trustee in
exchange for Outstanding Notes.





                                       52
<PAGE>   63
         SECTION 9.06     Notice of Supplemental Indentures.

         Promptly after the execution by the Company and the Trustee of any
supplemental indenture pursuant to the provisions of Section 9.02, the Company
shall give notice thereof to the Holders of each Outstanding Note affected, in
the manner provided for in Section 1.08, setting forth in general terms the
substance of such supplemental indenture.


                                  ARTICLE TEN

                                   COVENANTS

         SECTION 10.01    Payment of Principal and Interest.

         The Company covenants and agrees for the benefit of the Noteholders
and the Couponholders that it will duly and punctually pay the principal of and
interest on the Notes in accordance with the terms of the Notes and this
Indenture.

         SECTION 10.02    Maintenance of Office or Agency.

         The Company will maintain in Luxembourg and in not less than one other
European city an office or agency where Notes may be presented or surrendered
for payment, where Notes may be surrendered for conversion or exchange and
where notices and demands to or upon the Company in respect of the Notes and
this Indenture may be served.  The office of the Luxembourg Paying Agent at 43
Boulevard Royal, L-2955 Luxembourg and the corporate trust office of the
Principal Paying Agent at Mariner House, Pepys Street, London EC3N 4DA, England
shall be such offices or agencies of the Company, unless the Company shall
designate and maintain some other offices or agencies for one or more of such
purposes pursuant to the terms of that certain Paying and Conversion Agency
Agreement of even date herewith (the "Agency Agreement").  The Company will
give prompt written notice to the Trustee of any change in the location of any
such offices or agencies.  If at any time the Company shall fail to maintain
any such required offices or agencies or shall fail to furnish the Trustee with
the address thereof, such presentations, surrenders, notices and demands may be
made or served at the Corporate Trust Office of the Trustee, and the Company
hereby appoints the Trustee as its agent to receive all such presentations,
surrenders, notices and demands.

         The Company may also from time to time designate one or more other
offices or agencies (in or outside of Europe) where the Notes may be presented
or surrendered for any or all such purposes and may from time to time rescind
any such designation; provided, that no such designation or rescission shall in
any manner relieve the Company of its obligation to maintain an office or
agency in Europe for such purposes.  The Company will give prompt written
notice to the Trustee of any such designation or rescission and any change in
the location of any such other office or agency.





                                       53
<PAGE>   64
         SECTION 10.03    Money for Payments to Be Held in Trust.

         If the Company shall at any time act as its own Paying Agent, it will,
on or before each due date of the principal of or interest on any of the Notes,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum sufficient to pay the principal or interest so becoming due until such sums
shall be paid to such Persons or otherwise disposed of as herein provided and
will promptly notify the Trustee of its action or failure so to act.

         Whenever the Company shall have one or more Paying Agents for the
Notes, it will, on or before 3:00 p.m.  (London time) on the Business Day
immediately preceding each due date of the principal of or interest on any
Notes, deposit with a Paying Agent a sum sufficient to pay the principal or
interest so becoming due, such sum to be held in trust for the benefit of the
Persons entitled to such principal or interest, and (unless such Paying Agent
is the Trustee) the Company will promptly notify the Trustee of such action or
any failure so to act.

         Pursuant to the terms of the Agency Agreement, each Paying Agent shall
agree with the Trustee, subject to the provisions of this Section, that such
Paying Agent will:

                 (a)      hold all sums held by it for the payment of the
         principal of or interest on Notes in trust for the benefit of the
         Persons entitled thereto until such sums shall be paid to such Persons
         or otherwise disposed of as herein provided;

                 (b)      give the Trustee notice of any Default by the Company
         in the making of any payment of principal or interest; and

                 (c)      at any time during the continuance of any such
         Default, upon the written request of the Trustee, forthwith pay to the
         Trustee all sums so held in trust by such Paying Agent.

         The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Company Order direct any Paying Agent to pay, to the Trustee all sums held
in trust by the Company or such Paying Agent, such sums to be held by the
Trustee upon the same trusts as those upon which such sums were held by the
Company or such Paying Agent; and, upon such payment by any Paying Agent to the
Trustee, such Paying Agent shall be released from all further liability with
respect to such sums.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of or interest on any
Note and remaining unclaimed for two years after such principal or interest has
become due and payable shall be paid to the Company on Company Request, or (if
then held by the Company) shall be discharged from such trust; and the Holder
of such Note shall thereafter, as an unsecured general creditor, look only to
the Company for payment thereof, and all liability of the Trustee or such
Paying Agent with respect to such trust money, and all liability of the Company
as trustee thereof, shall thereupon cease; provided, however,





                                       54
<PAGE>   65
that the Trustee or such Paying Agent, before being required to make any such
repayment, may at the expense of the Company cause to be published once, in the
Authorized Newspapers, notice that such money remains unclaimed and that, after
a date specified therein, which shall not be less than 30 days from the date of
such publication, any unclaimed balance of such money then remaining will be
repaid to the Company.

         SECTION 10.04    Corporate Existence.

         The Company will do or cause to be done all things necessary to
preserve and keep in full force and effect its corporate existence, rights
(charter and statutory) and franchises of the Company; provided, however, that
the Company shall not be required to preserve any such right or franchise if
the Board of Directors shall determine that the preservation thereof is no
longer in the best interests of the Company and its Principal Subsidiaries as a
whole and the conduct of their collective businesses, and that the loss thereof
is not disadvantageous in any material respect to the Noteholders; and
provided, further, that nothing contained in this Section 10.04 shall prohibit
any transaction permitted by Article Eight or Sections such as 10.14.

         SECTION 10.05    Payment of Taxes and Other Claims.

         The Company will pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (a) all taxes, assessments and
governmental charges levied or imposed upon the Company or any Principal
Subsidiary or upon the income, profits or property of the Company or any
Principal Subsidiary and (b) all lawful claims for labour, materials and
supplies which, if unpaid, might by law become a Lien upon the property of the
Company or any Principal Subsidiary; provided, however, that the Company shall
not be required to pay or discharge or cause to be paid or discharged any such
tax, assessment, charge or claim whose amount, applicability or validity is
being contested in good faith by appropriate proceedings.

         SECTION 10.06    Maintenance of Properties.

         The Company will cause all properties owned by the Company or any
Principal Subsidiary or used or held for use in the conduct of its business or
the business of any Principal Subsidiary to be maintained and kept in good
condition, repair and working order (ordinary wear and tear excepted) and
supplied with all necessary equipment and will cause to be made all necessary
repairs, renewals, replacements, betterments and improvements thereof, all as
in the judgment of the Company may be necessary so that the business carried on
in connection therewith may be conducted at all times; provided, however, that
nothing in this Section shall prevent the Company from discontinuing the
maintenance of any of such properties if such discontinuance is, in the
judgment of the Company, desirable in the conduct of its business or the
business of any Principal Subsidiary and not disadvantageous in any material
respect to the Noteholders, and provided, further, that nothing contained in
this Section 10.06 shall prohibit any transaction permitted by Article Eight or
Section 10.11.





                                       55
<PAGE>   66
         SECTION 10.07    Insurance.

         The Company will at all times keep all of the Company's and its
Principal Subsidiaries' properties which are of an insurable nature insured
with insurers, believed by the Company to be responsible, against loss or
damage to the extent that property of similar character is usually so insured
by Corporations similarly situated and owning like properties in similar
geographic areas in which the Company or such Principal Subsidiary operates;
provided that such insurance is generally available at commercially reasonable
rates, and provided further that the Company or such Principal Subsidiary may
self-insure directly or through captive insurers or insurance cooperatives, to
the extent that the Company determines that such practice is consistent with
prudent business practices. Such insurance shall be in such amount, on such
terms, in such forms and for such periods as are customary for similarly
situated Persons in the Company's industry or in insurance markets available to
the Company.

         SECTION 10.08    Statement by Officers as to Default.

         The Company will deliver to the Trustee at its Corporate Trust Office,
within 120 days after the end of each fiscal year, a brief Officers'
Certificate including a statement by the officer executing such certificate
that in the course of performing his or her duties as an officer of the Company
such officer would normally obtain knowledge of (i) whether or not any Default
exists in the performance and observation of any terms, provisions and
conditions of this Indenture and (ii) whether or not the Company has otherwise
kept, observed, performed and fulfilled its obligations under this Indenture in
all material respects.  Such Officers' Certificate shall further state, as to
the officer signing such certificate, to the knowledge of such officer, as of
the date of such Officers' Certificate, (i) whether or not any Default exists,
(ii) whether or not the Company during the preceding fiscal year kept,
observed, performed and fulfilled in all material respects each and every
covenant and obligation of the Company under this Indenture and (c) whether or
not there was any Default in the performance and observance of any of the
terms, provisions or conditions of this Indenture during such preceding fiscal
year.  If the officer signing the Officers' Certificate knows of such a
Default, whether then existing or occurring during such preceding fiscal year,
the Officers' Certificate shall describe such Default and its status with
particularity.  The Company shall also promptly notify the Trustee if the
Company's fiscal year is changed so that the end thereof is on any date other
than the then current fiscal year end date.  For purposes of this Section
10.08, such compliance shall be determined without regard to any period of
grace granted by the Trustee or requirement of notice under this Indenture.
The Company will deliver to the Trustee, forthwith upon becoming aware of any
default in the performance or observance of any covenant, agreement or
condition contained in this Indenture, or any Event of Default, an Officers'
Certificate specifying with particularity such Default or Event of Default and
further stating what action the Company has taken or is taking or proposes to
take with respect thereto.





                                       56
<PAGE>   67
         SECTION 10.09    Provision of Financial Statements.

         Whether or not the Company is subject to Section 13(a) or 15(d) of the
Exchange Act, the Company will, to the extent permitted under the Exchange Act,
file with the Trustee the annual reports, quarterly reports and other documents
which the Company would have been required to file with the Commission pursuant
to such Sections 13(a) or 15(d) if the Company were so subject, such documents
to be filed with the Commission on or prior to the respective dates (the
"Required Filing Dates") by which the Company would have been required so to
file such documents if the Company were so subject.  The Company will also in
any event (x) within 15 days of each Required Filing Date file with the Trustee
copies of the annual reports, quarterly reports and other documents which the
Company has filed with the Commission or would have been required to file with
the Commission pursuant to Section 13(a) or 15(d) of the Exchange Act if the
Company were subject to such Sections and (y) if filing such documents by the
Company with the Commission is not permitted under the Exchange Act, promptly
upon written request, supply copies of such documents to any prospective
Noteholder at the Company's cost.

         SECTION 10.10    Limitation on Other Indebtedness.

         Neither the Company nor any Principal Subsidiary will create, incur,
assume, guarantee or in any other manner become directly or indirectly liable
for the payment of any Indebtedness that is senior in right of payment to the
Notes.

         SECTION 10.11    Limitation on Liens.

         The Company will not, and will not permit any of its Principal
Subsidiaries to, create, incur, assume or suffer to exist, any Lien of any kind
securing any Indebtedness that is senior to, pari passu with or subordinate in
right of payment to the Notes (including any assumption, guarantee or other
liability with respect thereto by any of its Principal Subsidiaries) upon any
Oil and Gas Properties of the Company or any of its Subsidiaries described in
any Independent Reserve Reports which are included in the Asset Value Coverage
Ratio, unless the Notes are equally and ratably secured or rank prior to the
Indebtedness secured by such Lien.

         SECTION 10.12    Waiver of Certain Covenants.

         The Company may omit in any particular instance to comply with any
term, provision or condition set forth in Section 8.03 or Sections 10.05
through 10.07, 10.09 through 10.11 if before or after the time for such
compliance the Holders of at least a majority in principal amount of the
Outstanding Notes, by Act of such Noteholders, waive such compliance in such
instance with such term, provision or condition, but no such waiver shall
extend to or affect such term, provision or condition except to the extent so
expressly waived, and, until such waiver shall become effective, the
obligations of the Company and the duties of the Trustee in respect of any such
term, provision or condition shall remain in full force and effect.





                                       57
<PAGE>   68
         SECTION 10.13    Maintenance of Asset Value Coverage Ratio.

         The Company will maintain an Asset Value Coverage Ratio equal or
greater than 1:1, such maintenance to be evidenced in part based on Independent
Reserve Reports prepared as of the end of each fiscal year (as the same may be
supplemented during such fiscal year) during the term of this Indenture.

         SECTION 10.14    Restrictions on Charter Amendments.

         The Company will not amend its Certificate of Incorporation or Bylaws
except as required by law or except to the extent that such amendment would not
have a material adverse effect on (a) the ability of the Company to perform its
obligations under this Indenture or the Notes or (b) the rights of the
Noteholders, except that neither (i) increases in the number of Shares and
issuance thereof with related securities, nor (ii) designations of Preferred
Stock of the Company, modifications of the terms of such designations and
issuance thereof with related securities, nor (iii) modification or expansion
of the indemnity provisions provided by the Company to its directors and
officers, nor (iv) change of the Company's registered agent shall be deemed an
amendment hereunder.

         SECTION 10.15    United States Withholding and Reporting Requirements.

         To the extent permitted by law, the Company will provide to the
Trustee, the Paying Agents or to any Noteholder such statements, certificates
or other documentation concerning the organization or operations of the Company
as may be reasonably necessary to establish any exceptions or exemptions from
United States federal income tax withholding and reporting requirements.

         SECTION 10.16    Maintenance of Listings for Notes and Shares.

         While any Conversion Right remains exercisable, the Company will
maintain a listing for all the issued Shares on the AMEX, it being understood
that if the Company is unable to obtain or maintain such listing of Shares, to
obtain and maintain a listing of all the Shares issued on the exercise of the
Conversion Rights on such Alternative Stock Exchange as the Company may from
time to time (with the written consent of the Trustee) determine and will
forthwith give notice to the Noteholders in accordance with Section 1.08 of the
listing, de-listing or quotation or lack of quotation of the Shares (as a
class) by any such Alternative Stock Exchange.

         SECTION 10.17    Change of Control

                 (a)      Upon the occurrence of a Change of Control, each
         Holder shall have the right to require that the Company repurchase
         such Holder's Notes in whole or in part in integral multiples of
         $10,000, at a purchase price (the "Purchase Price") in cash in an
         amount equal to 105% of the principal amount thereof, plus accrued and
         unpaid interest (including any





                                       58
<PAGE>   69
         defaulted interest), if any, to the date of purchase, in accordance
         with the procedures set forth in (b) of this Section.

                 (b)      Within 30 days following any Chance of Control, the
         Company shall publish in the manner provided in Section 1.08 a notice
         stating:

                          (1)     that a Change of Control has occurred and
                 that such Holder has the right to require the Company to
                 repurchase such Holder's Notes at the Purchase Price;

                          (2)     a purchase date (the "Purchase Date") which
                 shall be a Business Day not earlier than 45 days nor later
                 than 60 days from the date such notice;

                          (3)     the instructions a Holder must follow in
                 order to have its Notes repurchased in accordance with this
                 Section 10.17; and

                          (4)     that Notes not repurchased pursuant to this
                 Section 10.17 will continue to accrue interest; and

                          (5)     that any Notes repurchased pursuant to this
                 Section 10.17 shall cease to accrue interest after the
                 Purchase Date, unless the Company defaults in payment of the
                 Purchase Price.

                 (c)      Holders electing to have Notes repurchased will be
         required to surrender such Notes and a Notice of Exercise of
         Repurchase Right on a Change of Control in the form set forth as
         Exhibit G hereto to any Paying Agent at the address specified in the
         notice at least two (2) Business Days prior to the Purchase Date.
         Holders whose Notes are repurchased only in part will be issued new
         Notes equal in principal amount to the unrepurchased portion of the
         Notes surrendered as soon as practicable following the Purchase Date.

                 (d)      On the Purchase Date, the Company shall (i) accept
         for payment Notes or portions thereof validly surrendered to any
         Paying Agent, (ii) deposit with the Trustee or a Paying Agent money in
         immediately available funds sufficient to pay the Purchase Price of
         all Notes or a portion thereof so accepted, and (iii) deliver to the
         Trustee or a Paying Agent the Notes so accepted together with an
         Officer's Certificate stating the Notes or portions thereof accepted
         for payment by the Company.  If the Company complies with its
         obligations set forth in the immediately preceding sentence, whether
         or not a Default or Event of Default has occurred and is continuing on
         the Purchase Date, the Trustee or a Paying Agent shall as promptly as
         practicable mail or deliver to each Holder of Notes so accepted
         payment in an amount equal to the Purchase Price for such notes and
         the Company shall execute and the Trustee or a Paying Agent shall
         deliver to such Holder a new Note equal in principal amount to any
         unrepurchased portion of the Note surrendered, if any; provided that
         each such new Note will be in a principal amount of $10,000 or an
         integral multiple thereof.  Any Note not





                                       59
<PAGE>   70
         so accepted shall be as promptly as practicable delivered by the
         Trustee or any Paying Agent to the Holder thereof.

                 (e)      The Company will comply with the requirements of any
         applicable securities laws and regulations to the extent that such
         laws or regulations are applicable in connection with the repurchase
         of the Notes as a result of a Change of Control.

                 (f)      Prior to complying with the other provisions of this
         Section 10.17, but in any event within 90 days following a Change of
         Control, the Company shall either repay any outstanding Indebtedness
         or obtain the requisite consents, if any, under all agreements
         governing outstanding Indebtedness to the extent such outstanding
         Indebtedness does not permit the repurchase of Notes required by this
         Section 10.17


                                 ARTICLE ELEVEN

                              REDEMPTION OF NOTES

         SECTION 11.01    Right of Redemption.

         At any time after June 11, 2001, the Notes may be redeemed, at the
election of the Company, as a whole or from time to time in part.  Prior to
such time and on giving notice pursuant to Section 11.05, the Company may
redeem all of the Notes for the time being outstanding at their principal
amount, together with interest accrued to the Redemption Date, in the event
that prior to the date of such notice, Conversion Rights shall have been
exercised and/or purchases (and corresponding cancellations) have been effected
in respect of 85% or more in principal amount of the Notes.  Redemption shall
be subject to the conditions specified in the form of Note and, except in the
event of a repurchase due to a Change of Control pursuant to Section 10.17, at
a Redemption Price equal to 100% of the principal amount thereof, together with
accrued and unpaid interest to the Redemption Date, but only to the extent that
all unmatured Coupons are attached to such Notes.

         SECTION 11.02    Applicability of Article.

         Except in the event of a repurchase due to a Change of Control
pursuant to Section 10.17, redemption of Notes at the election of the Company
or otherwise, as permitted or required by any provision of this Indenture,
shall be made in accordance with such provision and this Article.

         SECTION 11.03    Election to Redeem; Notice to Trustee.

         The action of the Company to redeem any Notes pursuant to Section
11.01 shall be evidenced by a Board Resolution.  In case of any redemption
pursuant to Section 11.01, the Company shall, at least 30 days and not more
than 60 days prior to the Redemption Date fixed by the Company (unless a
shorter notice shall be satisfactory to the Trustee), notify the Trustee of
such Redemption





                                       60
<PAGE>   71
Date and of the principal amount of Notes to be redeemed and shall deliver to
the Trustee such documentation and records as shall enable the Trustee to
select the Notes to be redeemed pursuant to Section 11.04.

         SECTION 11.04    Selection by Trustee of Notes to Be Redeemed.

         If less than all the Notes are to be redeemed, the particular Notes to
be redeemed shall be selected not more than 60 days prior to the Redemption
Date by the Trustee, from the Outstanding Notes not previously called for
redemption, by such method as the Trustee shall deem fair and appropriate and
which may provide for the selection for redemption of portions of the principal
of Notes; provided, however, that no such partial redemption shall reduce the
portion of the principal amount of a Note not redeemed to less than $10,000.
The Noteholders do not have a right to a prorated redemption.

         The Trustee shall promptly notify the Company in writing of the Notes
selected for redemption and, in the case of any Notes selected for partial
redemption, the principal amount thereof to be redeemed.

         For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to redemption of Notes shall relate, in the
case of any Notes redeemed or to be redeemed only in part, to the portion of
the principal amount of such Note which has been or is to be redeemed.

         If the Company shall so direct, Notes registered in the name of the
Company or any Subsidiaries shall not be included in the Notes selected for
redemption.

         SECTION 11.05    Notice of Redemption.

         Notice of redemption shall be given in the manner provided for in
Section 1.08 not less than 30 days nor more than 60 days prior to the
Redemption Date, to each Holder of Notes to be redeemed.

         All notices of redemption shall state:

                 (a)      the Redemption Date;

                 (b)      the Redemption Price;

                 (c)      if less than all Outstanding Notes are to be
         redeemed, the identification (and, in the case of a partial
         redemption, the principal amounts) of the particular Notes to be
         redeemed;

                 (d)      that on the Redemption Date the Redemption Price
         (together with accrued and unpaid interest, if any, to the Redemption
         Date payable as provided in Section 11.07, but





                                       61
<PAGE>   72
         only with respect to Notes with all unmatured Coupons attached) will
         become due and payable upon each such Note, or the portion thereof, to
         be redeemed, and that interest thereon will cease to accrue on and
         after said date;

                 (e)      the place or places where such Notes are to be
         surrendered for payment of the Redemption Price; and

                 (f)      pursuant to Section 3.13, any ISIN, CUSIP or other
         identifying numbers relating to the Notes.

         Notice of redemption of Notes to be redeemed at the election of the
Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

         SECTION 11.06    Deposit of Redemption Price.

         Not less than one Business Day prior to any Redemption Date, the
Company shall deposit with the Trustee or with a Paying Agent (or, if the
Company is acting as its own Paying Agent, segregate and hold in trust as
provided in Section 10.03) an amount of money sufficient to pay the Redemption
Price of, and accrued and unpaid interest on, all the Notes which are to be
redeemed on that date.

         SECTION 11.07    Notes Payable on Redemption Date.

         Notice of redemption having been given as aforesaid, the Notes so to
be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified (together with accrued and unpaid interest,
if any, to the Redemption Date, subject to the delivery of all unmatured and
matured but unpaid Coupons), and from and after such date (unless the Company
shall default in the payment of the Redemption Price) such Notes shall cease to
bear interest.  Upon surrender of any such Note for redemption in accordance
with said notice, such Note shall be paid by the Company at the Redemption
Price, together with accrued interest, if any, to the Redemption Date, to the
extent that all matured and unpaid and unmatured Coupons, if any, are attached;
provided, however, that instalments of interest whose Stated Maturity is on or
prior to the Redemption Date shall be payable to the Holders of such Notes, or
one or more Predecessor Notes, according to their terms.

         If any Note called for redemption shall not be so paid upon surrender
by the Noteholder as prescribed hereunder thereof for redemption, the principal
shall, until paid, bear interest from the Redemption Date at the rate
prescribed therefor in the Notes.  In the event that the Company shall default
in making payment in full in respect of any Note which shall have been called
for redemption prior to June 11, 2002, on the Redemption Dates the Conversion
Right attaching to such Note will continue to be exercisable (unless previously
exercised by the Trustee or the Company) up to, and including the close of
business (at the place where the Note is deposited in connection with the





                                       62
<PAGE>   73
exercise of the Conversion Right) on the date upon which the full amount of the
monies payable in respect of such Note has been duly received by the Trustee or
the Principal Paying Agent or, if earlier, June 11, 2002.

         SECTION 11.08    Surrender of Notes

         Each Note should be presented for redemption together with all
unmatured Coupons relating to such Note, failing which the full amount of any
missing unmatured Coupon (or, in the case of payment not being made in full,
that proportion of the full amount of the missing unmatured Coupons which the
amount so paid bears to the total amount due) will be deducted from the amount
due for payment.  Each amount so deducted will be paid in the manner mentioned
above against presentation and surrender (or, in the case of part payment only,
endorsement) of such missing Coupon at any time before the expiry of six (6)
years after the Relevant Date in respect of the relevant Note (whether or not
such Coupon would otherwise have become void pursuant to Condition 10), or if
later, five (5) years after the date on which such Coupon would have become
due, but not thereafter.

         SECTION 11.09    Conversion on Redemption

                 (a)      The Trustee may, at its absolute discretion (and
         without any responsibility for any loss occasioned thereby), within
         the period commencing on the date four (4) Business Days prior to, and
         ending at the close of business on the Business Day prior to the
         Redemption Date, of any of the Notes elect by notice in writing to the
         Company to convert as of such Redemption Date the aggregate number of
         Notes due for conversion on such date any Unexercised Notes into
         Shares at the Conversion Price applicable at such Redemption Date if
         all necessary consents (if any) have been obtained and the Trustee is
         satisfied or is advised by a reputable independent investment bank
         appointed by it that the net proceeds of an immediate sale of the
         Shares arising from such conversion (disregarding any liability (other
         than a liability of the Trustee) for taxation or the payment of any
         capital, stamp, issue or registration duties consequent thereon) would
         be likely to exceed by 5 percent or more the amount of redemption
         monies and interest which would otherwise be payable in respect of
         interest accrued and unpaid since the Interest Payment Date
         immediately preceding such Redemption Date or if such date falls
         before the first Interest Payment Date, since the Closing Date in
         respect of such Unexercised Notes.

                 (b)      The Subject to applicable law, the Trustee shall
         arrange for the sale on behalf of the Holders of the Unexercised Notes
         of the Shares issued on such conversion as soon as practicable, and
         (subject to any necessary consents being obtained and to the deduction
         by the Trustee of any amount which it determines to be payable in
         respect of its liability to taxation or the payment of any capital,
         stamp, issue or registration duties (if any) and any costs incurred by
         the Trustee in connection with that allotment and sale thereof) the
         net proceeds of sale together with accrued and unpaid interest payable
         under Condition 6(C)(iv) of the Terms and Conditions of the Notes in
         respect of such Unexercised Notes (if any) shall





                                       63
<PAGE>   74
         be held by the Trustee and distributed by the Principal Paying Agent
         rateably to the Holders of such Unexercised Notes against due
         presentation in accordance with Condition 5 of the Terms and
         Conditions of the Notes.  The amount of such net proceeds of sale
         shall be treated for all purposes as the full amount due by the
         Company in respect of such Unexercised Notes.


                                 ARTICLE TWELVE

                                   CONVERSION

         SECTION 12.01    Conversion Right and Conversion Price.

                 (a)      Subject to and upon compliance with the provisions of
         this Article, at the option of the Noteholder, at any time from and
         after the first Business Day following termination of the Restricted
         Period and (i) up to the close of business on the second Business Day
         preceding June 11, 2002 (but in no event thereafter), or (ii) if such
         Note  shall have been called for redemption pursuant to Article Eleven
         or if the Company is required to repurchase the Notes pursuant to
         Section 10.17, up to and including two (2) Business Days prior to the
         Redemption Date or Purchase Date, as the case may be,  provided, that
         the Company shall not have given notice of any Mandatory Conversion
         Date, any Note may be converted at the principal amount thereof into
         fully paid and non-assessable Conversion Shares at the Conversion
         Price.

                 (b)      The Conversion Price shall be adjusted in certain
         instances as provided in Section 12.04.

                 (c)      A holder of shares of Common Stock issued on
         conversion of Notes shall not be entitled to any rights for any Record
         Date which precedes the relevant Conversion Date or Mandatory
         Conversion Date, as the case may be.

         SECTION 12.02    Exercise of Conversion Right.

                 (a)      In order to exercise the Conversion Right, the
         Noteholder to be converted shall provide notice to the Conversion
         Agent that it intends to exercise its Conversion Right and shall
         surrender such Bearer Note or Notes and all unmatured Coupons,
         including the one for the next due interest payment, to the Conversion
         Agent at its corporate trust offices, or such other office of any
         Conversion Agent as published in the Authorized Newspapers from time
         to time, accompanied by written notice (as set forth in Exhibit E
         hereto) to the Conversion Agent that the Noteholder elects to convert
         such Note.  A Conversion Notice once delivered shall be irrevocable.





                                       64
<PAGE>   75
                 (b)      Bearer Notes shall be deemed to have been converted
         on the Conversion Date, and at such time, except as provided in this
         Section 12.02 below, the rights of the Noteholders as Noteholders
         shall cease, and the Person or Persons entitled to receive the Common
         Stock issuable upon conversion shall be treated for all purposes as
         the record holder or holders of such Common Stock at such time.  As
         promptly as practicable on or after the Conversion Date, the Company
         shall issue and shall deliver through the Conversion Agent at the
         Conversion Agent's office or agency a certificate or certificates for
         the number of full shares of Common Stock issuable upon such
         conversion.  The Conversion Agent shall deliver the share certificate
         or certificates in accordance with the instructions set forth in the
         notice of exercise of Conversion Rights.

                 (c)      If the Conversion Date is a date other than an
         Interest Payment Date the Company shall not pay and the Noteholder
         shall not be entitled to receive any interest accrued on the Notes
         from the last Interest Payment Date prior to the Conversion Date.

                 (d)      No Noteholder will be entitled upon conversion
         thereof to any payment or adjustment on account of interest on the
         Notes or dividends on the shares of Common Stock issued in connection
         therewith.

         SECTION 12.03    Calculation of Shares Issued on Conversion and 
                          Fractions of Shares.

                 (a)      The number of Shares to be issued on conversion of a
         Note will be determined by dividing the principal amount of the Note
         to be converted by the Conversion Price in effect on the Conversion
         Date and adding any Shares issuable pursuant to Section 12.03(b), with
         the result being rounded down to the nearest whole number.  No cash in
         lieu of or fractional shares of Common Stock shall be issued upon
         conversion of Notes.  If more than one Note shall be surrendered for
         conversion at one time by the same Noteholder, the number of full
         Shares which shall be issuable upon conversion thereof shall be
         computed on the basis of the aggregate principal amount of the Notes
         (or specified portions thereof) so surrendered.

                 (b)      Holders of Notes voluntarily converted following the
         Restricted Period but prior to December 11, 1997, will receive on such
         conversion a premium in the number of Shares to be issued on such
         conversion determined based on the aggregate principal amount of Notes
         to be converted by multiplying .05 times the number of Shares to be so
         issued and rounding down to the nearest whole number.

         SECTION 12.04    Adjustment of Conversion Price.

                 (a)      Dividends or Distributions of Common Stock.  In case
         the Company shall pay or make a dividend or other distribution on its
         Common Stock exclusively in Common Stock or shall pay or make a
         dividend or other distribution on any other class of capital stock of
         the Company which dividend or distribution includes Common Stock, the
         Conversion Price in





                                       65
<PAGE>   76
         effect at the opening of business on the day next following the date
         fixed for the determination of stockholders entitled to receive such
         dividend or other distribution shall be reduced by multiplying such
         Conversion Price by a fraction of which the numerator shall be the
         number of shares of Common Stock outstanding at the close of business
         on the date fixed for such determination and the denominator shall be
         the sum of such number of shares and the total number of shares
         constituting such dividend or other distribution, such reduction to
         become effective immediately after the opening of business on the day
         next following the date fixed for such determination.  For the
         purposes of this Section 12.04(a), the number of shares of Common
         Stock at any time outstanding shall not include shares held in the
         treasury of the Company.

                 (b)      Dividends or Distributions of Rights, Warrants or
         Options to Purchase Common Stock.  In case the Company shall pay or
         make a dividend or other distribution on its Common Stock consisting
         exclusively of, or shall otherwise issue to all holders of its Common
         Stock, rights, warrants or options entitling the holders thereof to
         subscribe for or purchase shares of Common Stock at a price per share
         less than the Market Price per share (determined as provided in
         Section 12.04(g)) of the Common Stock on the date fixed for the
         determination of stockholders entitled to receive such rights,
         warrants or options, the Conversion Price in effect at the opening of
         business on the day following the date fixed for such determination
         shall be reduced by multiplying such Conversion Price by a fraction of
         which the numerator shall be the number of shares of Common Stock
         outstanding at the close of business on the date fixed for such
         determination plus the number of shares of Common Stock which the
         aggregate of the offering price of the total number of shares of
         Common Stock so offered for subscription or purchase would purchase at
         such Market Price and the denominator shall be the number of shares of
         Common Stock outstanding at the close of business on the date fixed
         for such determination plus the number of shares of Common Stock so
         offered for subscription or purchase, outstanding at the close of
         business on the date fixed for such reduction to become effective
         immediately after the opening of business on the day following the
         date fixed for such determination.  For the purposes of this paragraph
         (b), the number of shares of Common Stock at any time outstanding
         shall not include shares held in the treasury of the Company.  The
         Company shall not issue any rights, warrants or options in respect of
         shares of Common Stock held in the treasury of the Company.

                 (c)      Dividends or Distributions in Cash.  In case the
         Company shall, by dividend or otherwise, make a distribution to all
         holders of its Common Stock exclusively in cash in an aggregate amount
         that, together with (i) the aggregate amount of any other
         distributions to all holders of its Common Stock made exclusively in
         cash within the 12 months preceding the date of payment of such
         distribution and in respect of which no Conversion Price adjustment
         pursuant to this Section 12.04(c) has been made and (ii) the aggregate
         of any cash plus the fair market value (as determined in good faith by
         the Board of Directors, whose determination shall be conclusive and
         described in a resolution of the Company's Board of Directors), as of
         the expiration of the tender or exchange offer referred to below, of
         consideration payable in respect of any tender or exchange offer by
         the Company or a





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<PAGE>   77
         Subsidiary for all or any portion of the Common Stock concluded within
         the 12 months preceding the date of payment of such distribution and
         in respect of which no Conversion Price adjustment pursuant to
         paragraph (f) of this Section 12.04 has been made, exceeds five
         percent (5%) of the product of the Market Price per share (determined
         as provided in Section 12.04(g)) of the Common Stock on the date fixed
         for stockholders entitled to receive such distribution times the
         number of shares of Common Stock outstanding on such date, the
         Conversion Price shall be reduced so that the same shall equal the
         price determined by multiplying the Conversion Price in effect
         immediately prior to the effectiveness of the Conversion Price
         reduction contemplated by this paragraph (c) by a fraction of which
         the numerator shall be the Market Price per share (determined as
         provided Section 12.04(g)) of the Common Stock on the date of such
         effectiveness less the amount of cash so distributed applicable to one
         share of Common Stock and the denominator shall be such Market Price
         per share of the Common Stock, such reduction to become effective
         immediately prior to the opening of business on the day following the
         date fixed for the payment of such distribution.

                 (d)      All Other Distributions or Dividends.  Subject to the
         last sentence of this paragraph (d), in case the Company shall, by
         dividend or otherwise, distribute to all holders of its Common Stock
         evidences of its indebtedness, shares of any class of capital stock,
         securities, cash or property (excluding any rights, warrants or
         options referred to in Section 12.04(b), any dividend or distribution
         paid exclusively in cash and any dividend or distribution referred to
         in Section 12.04(a), the Conversion Price shall be reduced so that the
         same shall equal the price determined by multiplying the Conversion
         Price in effect immediately prior to the effectiveness of the
         Conversion Price reduction contemplated by this paragraph (d) by a
         fraction of which the numerator shall be the Market Price per share
         (determined as provided in paragraph (g) of this Section) of the
         Common Stock on the date of such effectiveness less the fair market
         value (as determined in good faith by the Board of Directors, whose
         determination shall be conclusive and described in a resolution of the
         Company's Board of Directors and shall, in the case of securities
         being distributed for which prior thereto there is an actual or when
         issued trading market, be no less than the value determined by
         reference to the average of the Market Price over the period specified
         in the succeeding sentence), on the date of such effectiveness, of the
         portion of the evidences of indebtedness, shares of capital stock,
         securities, cash and property so distributed applicable to one share
         of Common Stock and the denominator shall be such Market Price per
         share of the Common Stock, such reduction to become effective
         immediately prior to the opening of business on the day next following
         the date fixed for the payment of such distribution (such date to
         being referred to as the "Reference Date").  If the Board of Directors
         determines the fair market value of any distribution for purposes of
         this paragraph (d) by reference to the actual or when issued trading
         market for any securities comprising such distribution, it must in
         doing so consider the prices in such market over the same period used
         in computing the Market Price per share pursuant to paragraph (g) of
         this Section.  For purposes of this paragraph (d), any dividend or
         distribution that includes shares of Common Stock or rights, warrants
         or options to subscribe for or purchase shares of Common Stock shall
         be deemed instead to be (i) a dividend or distribution of the
         evidences of indebtedness, cash, property,





                                       67
<PAGE>   78
         shares of capital stock or securities other than such shares of Common
         Stock or such rights, warrants or options (making any Conversion Price
         reduction required by this paragraph (d)) immediately followed by (ii)
         a dividend or distribution of such shares of Common Stock or such
         rights, warrants or options (making any further Conversion Price
         reduction required by Section 12.04(a) or (b)), except (i) the
         Reference Date of such dividend or distribution as defined in this
         Section 12.04(d) shall be substituted as "the date fixed for the
         determination of stockholders entitled to receive such dividend or
         other distribution", "the date fixed for the determination of
         stockholders entitled to receive such rights, warrants or options" and
         "the date fixed for such determination" within the meaning of Section
         12.04(a) and (b) and (ii) any shares of Common Stock included in such
         dividend or distribution shall not be deemed "outstanding at the close
         of business on the date fixed for such determination" within the
         meaning of Section 12.04(a)).

                 (e)      Subdivision of Common Stock.  In case outstanding
         shares of Common Stock shall be subdivided into a greater number of
         shares of Common Stock, the Conversion Price in effect at the opening
         of business on the day following the day upon which such subdivision
         becomes effective shall be proportionately reduced, and, conversely,
         in case outstanding shares of Common Stock shall each be combined into
         a smaller number of shares of Common Stock, the Conversion Price in
         effect at the opening of business on the day following the day upon
         which such combination becomes effective shall be proportionately
         increased, such reduction or increase, as the case may be, to become
         effective immediately after the opening of business on the day
         following the day upon which such subdivision or combination becomes
         effective.

                 (f)      Tender or Exchange Offer for Common Stock.  In case a
         tender or exchange offer made by the Company or any Subsidiary for all
         or any portion of the Common Stock shall expire and such tender or
         exchange offer shall involve an aggregate consideration having a fair
         market value (as determined in good faith by the Board of Directors,
         whose determination shall be conclusive and described in a resolution
         of the Company's Board of Directors) at the last time (the "Expiration
         Time") tenders or exchanges may be made pursuant to such tender or
         exchange offer (as it may be amended) that, together with (i) the
         aggregate of the cash plus the fair market value (as determined in
         good faith by the Board of Directors, whose determination shall be
         conclusive and described in a resolution of the Company's Board of
         Directors), as of the expiration of the other tender or exchange offer
         referred to below, of consideration payable in respect of any other
         tender or exchange offer by the Company or a Subsidiary for all or any
         portion of the Common Stock concluded within the preceding 12 months
         and in respect of which no Conversion Price adjustment pursuant to
         this paragraph (f) has been made and (ii) the aggregate amount of any
         distributions to all holders of the Common Stock made exclusively in
         cash within the preceding 12 months and in respect of which no
         Conversion Price adjustment pursuant to Section 12.04(e) has been
         made, exceeds five percent (5%) of the product of the Market Price per
         share (determined as provided in Section 12.04(g)) of the Common Stock
         on the Expiration Time times the number of shares of Common Stock
         outstanding (including any





                                       68
<PAGE>   79
         tendered shares) on the Expiration Time, the Conversion Price shall be
         reduced (but not increased) so that the same shall equal the price
         determined by multiplying the Conversion Price in effect immediately
         prior to the Expiration Time by a fraction of which the numerator
         shall be (i) the product of the Market Price per share (determined as
         provided in Section 12.04(g)) of the Common Stock at the Expiration
         Time times the number of shares of Common Stock outstanding (including
         any tendered or exchanged shares) at the Expiration Time minus (ii)
         the fair market value (determined as aforesaid) of the aggregate
         consideration payable to stockholders based on the acceptance (up to
         any maximum specified in the terms of the tender or exchange offer) of
         all shares validly tendered or exchanged and not withdrawn as of the
         Expiration Time (the shares deemed so accepted, up to any such
         maximum, being referred to as the "Purchased Shares") and the
         denominator shall be the product of (i) such Market Price per share at
         the Expiration Time times (ii) such number of outstanding shares at
         the Expiration Time less the number of Purchased Shares, such
         reduction to become effective immediately prior to the opening of
         business on the day following the Expiration Time.

                 (g)      Determination of Market Price.  For the purpose of
         any computation of the Market Price under this paragraph (g) and
         Section 12.04(b), (d) and (e), (i) if the "ex" date (as hereinafter
         defined) for any event (other than the issuance or distribution
         requiring such computation) that requires an adjustment to the
         Conversion Price pursuant to paragraph (a), (b), (c), (d), (e) or (f)
         above ("Other Event") occurs on or after the tenth Stock Exchange
         Business Day prior to the date in question and prior to the "ex" date
         for the issuance or distribution requiring such computation (the
         "Current Event"), the closing price for each Stock Exchange Business
         Day prior to the "ex" date for such Other Event shall be adjusted by
         multiplying such closing price by the same fraction by which the
         Conversion Price is so required to be adjusted as a result of such
         Other Event, (ii) if the "ex" date for any Other Event occurs after
         the "ex" date for the Current Event and on or prior to the date in
         question, the closing price for each Stock Exchange Business Day on
         and after the "ex" date for such Other Event shall be adjusted by
         multiplying such closing price by the reciprocal of the fraction by
         which the Conversion Price is so required to be adjusted as a result
         of such Other Event, (iii) if the "ex" date for any Other Event occurs
         on the "ex" date for the Current Event, one of those events shall be
         deemed for purposes of clauses (i) and (ii) of this proviso to have an
         "ex" date occurring prior to the "ex" date for the other event, and
         (iv) if the "ex" date for the Current Event is on or prior to the date
         in question, after taking into account any adjustment required
         pursuant to clause (ii) of this proviso, the closing price for each
         Stock Exchange Business Day on or after such "ex" date shall be
         adjusted by adding thereto the amount of any cash and the fair market
         value on the date in question (as determined in good faith by the
         Board of Directors in a manner consistent with any determination of
         such value for purposes of this Section 12.04(c) or (d), whose
         determination shall be conclusive and described in a resolution of the
         Company's Board of Directors) of the portion of the rights, warrants,
         options, evidences of indebtedness, shares of capital stock,
         securities, cash or property being distributed applicable to one share
         of Common Stock.  For the purpose of any computation under Section
         12.04(f), the Market Price per share of Common Stock on any





                                       69
<PAGE>   80
         date in question shall be deemed to be the Market Price on the date
         selected by the Company commencing on or after the latest (the
         "Commencement Date") of (i) the date 20 Stock Exchange Business Days
         before the date in question, (ii) the date of commencement of the
         tender or exchange offer requiring such computation and (iii) the date
         of the last amendment, if any, of such tender or exchange offer
         involving a change in the maximum number of shares for which tenders
         are sought or a change in the consideration offered, and ending not
         later than the date of the Expiration Time of such tender or exchange
         offer (or, if such Expiration Time occurs before the close of trading
         on a Stock Exchange Business Day, not later than the Stock Exchange
         Business Day immediately preceding the date of such Expiration Time);
         provided, however, that if the "ex" date for any Other Event (other
         than the tender or exchange offer requiring such computation) occurs
         on or after the Commencement Date and on or prior to the date of the
         Expiration Time for the tender or exchange offer requiring such
         computation, the closing price for each Stock Exchange Business Day
         prior to the "ex" date for such Other Event shall be adjusted by
         multiplying such closing price by the same fraction by which the
         Conversion Price is so required to be adjusted as a result of such
         other event.  For purposes of this paragraph, the term "ex" date, (i)
         when used with respect to any issuance or distribution, means the
         first date on which the Common Stock trades regular way on the
         relevant exchange or in the relevant market from which the closing
         price was obtained without the right to receive such issuance or
         distribution, (ii) when used with respect to any subdivision or
         combination of shares of Common Stock, means the first date on which
         the Common Stock trades regular way on such exchange or in such market
         after the time at which such subdivision or combination becomes
         effective, and (iii) when used with respect to any tender or exchange
         offer means the first date on which the Common Stock trades regular
         way on such exchange or in such market after the Expiration Time of
         such tender or exchange offer.

                 (h)      Further Reductions for Federal Income Tax.  The
         Company may make such reductions in the Conversion Price, in addition
         to those required by Section 12.04 (a), (b), (c), (d), (e) and (f), as
         it considers to be advisable in order that any event treated for
         Federal income tax purposes as a dividend of stock or stock rights
         shall not be taxable to the recipients.

                 (i)      Adjustments to be Carried Forward.  No adjustment in
         the Conversion Price shall be required unless such adjustment would
         require an increase or decrease of at least five percent (5%) in the
         Conversion Price; provided, however, that any adjustments which by
         reason of this paragraph (j) are not required to be made shall be
         carried forward and taken into account in any subsequent adjustment.

         SECTION 12.05    Notice of Adjustments of Conversion Price

         Whenever the Conversion Price is adjusted as herein provided the
Company shall compute the adjusted Conversion Price in accordance with Section
12.04 and shall prepare a certificate signed by the chief financial officer of
the Company setting forth the adjusted Conversion Price and





                                       70
<PAGE>   81
showing in reasonable detail the facts upon which such adjustment is based, and
such certificate shall forthwith be delivered to the Trustee, the Paying Agent
and the Conversion Agent, and the Company shall cause notice thereof to be
published in accordance with Section 1.08 within ten (10) Business Days of the
effective date of such adjustment.

         SECTION 12.06    Notice of Certain Corporate Action.

         In case:

                 (a)      the Company shall declare a dividend (or any other
         distribution) on its Common Stock payable (i) otherwise than
         exclusively in cash or (ii) exclusively in cash in an amount that
         would require a Conversion Price adjustment pursuant to Section
         12.04(c); or

                 (b)      the Company shall authorize the granting to the
         holders of its Common Stock of rights, warrants or options to
         subscribe for or purchase any shares of capital stock of any class or
         of any other rights (excluding employee stock options); or

                 (c)      of any reclassification of the Common Stock of the
         Company (other than a subdivision or combination of its outstanding
         shares of Common Stock), or of any consolidation or merger to which
         the Company is a party and for which approval of any stockholders of
         the Company is required, or of the sale or transfer of all or
         substantially all of the assets of the Company; or

                 (d)      of the voluntary or involuntary dissolution,
         liquidation or winding up of the Company; or

                 (e)      the Company or any Subsidiary of the Company shall
         commence a tender or exchange offer for all or a portion of the
         Company's outstanding shares of Common Stock (or shall amend any such
         tender or exchange offer);

then the Company shall cause to be mailed to the Trustee, the Paying Agent and
the Conversion Agent and to be published in the manner provided under Section
1.08 hereof within ten (10) Business Days after the date on which notice is
sent to the holders of the Company's Common Stock, a notice stating (i) the
date on which a record is to be taken for the purpose of such dividend,
distribution or granting of rights, warrants or options, or, if a record is not
to be taken, the date as of which the holders of Common Stock of record to be
entitled to such dividend, distribution, rights, warrants or options are to be
determined, or (ii) the date on which such reclassification, consolidation,
merger, sale, transfer, dissolution, liquidation or winding up is expected to
become effective, and the date as of which it is expected that holders of
Common Stock of record shall be entitled to exchange their shares of Common
Stock for securities, cash or other property deliverable upon such
re-classification, consolidation, merger, sale, transfer, dissolution,
liquidation or winding up, or (iii) the date on which such tender offer
commenced, the date on which such tender offer is





                                       71
<PAGE>   82
scheduled to expire unless extended, the consideration offered and the other
material terms thereof (or the material terms of any amendment thereto).

         SECTION 12.07    Company to Reserve Common Stock.

         The Company shall at all times reserve and keep available, free from
pre-emptive or similar rights, out of its authorized but unissued Common Stock,
solely for the purpose of effecting the conversion of Notes, the whole number
of Shares then issuable upon the conversion in full of all Outstanding Notes.

         SECTION 12.08    Taxes on Conversions.

         The Company will pay any and all taxes that may be payable in respect
of the issue or delivery of Shares on conversion of Notes pursuant hereto. The
Company shall not, however, be required to pay any tax which may be payable in
respect of any transfer involved in the issue and delivery of Shares in a name
other than that of the Holder of the Notes to be converted, and no such issue
or delivery shall be made unless and until the Person requesting such issue has
paid to the Company the amount of any such tax, or has established to the
satisfaction of the Company that such tax has been paid.

         SECTION 12.09    Cancellation of Converted Bearer Notes.

         All Bearer Notes delivered for conversion to the Conversion Agent
shall be cancelled by the Company, and shall not under any circumstances be
reissued.

         SECTION 12.10    Provisions in Case of Reclassification Consolidation,
                          Merger or Sale of Assets.

         In the event that the Company shall be a party to any transaction,
including without limitation any (i) recapitalization or reclassification of
the Common Stock (other than a change in par value, or from par value to no par
value, or from no par value to par value, or as a result of a subdivision or
combination of the Common Stock), (ii) any consolidation of the Company with,
or merger of the Company into, any other person, any merger of another person
into the Company (other than a merger which does not result in a
reclassification, conversion, exchange or cancellation of all of the
outstanding shares of Common Stock of the Company), (iii) any sale or transfer
of all or substantially all of the assets of the Company, or (iv) any
compulsory share exchange pursuant to which the Common Stock is converted into
the right to receive other securities, cash or other property, then lawful
provision shall be made as part of the terms of such transaction whereby the
Holder of each Note then outstanding shall have the right thereafter to convert
such Note only into the kind of common stock receivable upon such transaction
by a holder of Common Stock (at an adjusted Conversion Price equal to (a) the
Conversion Price determined pursuant to Section 12.04 as though all such
securities, cash or property (other than common stock) had been distributed in
a dividend covered by Section 12.04(d) with an "ex" date on the date of such
transaction divided by





                                       72
<PAGE>   83
(b) the number of shares (or fraction thereof) of common stock receivable upon
such transaction in respect of each share of Common Stock).  The Person formed
by such consolidation or resulting from such merger or which acquired such
assets or which acquired the Company's Shares, as the case may be, shall
execute and deliver to the Trustee on behalf of  each of the Noteholders an
amendment to this Indenture as provided for under Article Nine.  Such amendment
shall provide for adjustments which, for events subsequent to the effective
date of such amendment, shall be as nearly equivalent as may be practicable to
the adjustments provided for in this Article and shall provide for the
assumption by such other Person, if any, of the Company's obligations under
this Indenture and the Notes.  The above provisions of this Section 12.10 shall
similarly apply to successive transactions of the foregoing type.

         SECTION 12.11    Mandatory Conversion.

         At any time after June 11, 1998, the Notes may be converted in whole,
at the Company's option, if at any time the average of Market Price of the
Common Stock over the Stock Exchange Business Days in any thirty (30)
consecutive calendar day period, the first day of which falls on or after June
11, 1997, is equal to or greater than 130% of the Conversion Price.  In the
event that the Company has met the criteria for Mandatory Conversion at any
time, the Company shall give notice to the Noteholders in the manner provided
for in Section 1.08 within 30 calendar days of the date on which such criteria
has been met.

         In the event that certain proposed amendments to Regulation S are
deemed applicable to the Notes and if the Company elects to convert the Notes
prior to the time at which the Shares are saleable into the United States
markets under the provisions of Rule 144 promulgated by the Commission pursuant
to the Securities Act or any other applicable exemption from the registration
requirements under the Securities Act (or similar provisions as then in
effect), the Company shall register the issuance or resale of the Shares under
the Securities Act as soon as practicable and maintain the effectiveness of a
registration statement covering the Shares for such period of time as may be
necessary to effectuate the resale of the Shares without the restrictions
imposed by the provisions of Rule 144 of the Securities Act.

         In the event that any amendments to Regulation S are deemed to be
applicable to the Notes, notice of such amendments will be given to the
Luxembourg Stock Exchange and to the Noteholders in accordance with Section
1.08.

         At any time after June 11, 1998, the Company may require such
Noteholders to convert all of such Notes otherwise pursuant to the terms of
this Article.  The Company shall deliver to the Trustee a notice in the form of
Exhibit F hereto and the Company shall cause to be published once in accordance
with Section 1.08 hereof a notice of Mandatory Conversion not less than thirty
(30) and not more than (60) calendar days prior to the Mandatory Conversion
Date.  Such notice shall specify the Mandatory Conversion Date.  After the
Mandatory Conversion Date, the Notes will no longer represent Indebtedness of
the Company and will no longer accrue interest or require the Company to make
any payment of principal; and the Company's obligations to make any further





                                       73
<PAGE>   84
payments with respect to the Notes will terminate (except for this Section
12.11 and the Section 12.02(c)); and the only rights of a Holder of a Note not
surrendered for conversion pursuant to the preceding sentence will be to (i)
receive the number of Conversion Shares such Noteholder would have received had
the Holder's Note or Notes been surrendered for conversion as required hereby,
(ii) the payment referred to in Section 12.02(c) and (iii) the payment referred
to in Section 12.03.  Any notice which is published in the manner herein
provided shall be conclusively presumed to be given and any defect in such
notice to the Noteholder designated for required conversion shall not affect
the validity of the proceedings for the required conversion of any other Bearer
Note.

         SECTION 12.12    Proposed Amendments to Regulation S.

         Notwithstanding anything contained herein to the contrary, in the
event that Regulation S is amended to require a lengthening of the restricted
period for securities sold under Regulation S and such amendments are deemed
applicable to the Notes, the Notes may not be converted prior to the earlier of
(i) the end of the new restricted period, as so required by such amendments or
(ii) the registration of the Shares by the Company as described below.  The
Company has agreed that if the Restricted Period has been lengthened because
such amendments are applicable to the Notes, that it will register the issuance
or resale of the Shares under the Securities Act as soon as practicable and
maintain the effectiveness of a registration statement covering such Shares for
such period of time as may be necessary to effectuate the resale of the Shares
without regard to any extension of the Restricted Period.

         In the event that any amendments to Regulation S are deemed to be
applicable to the Notes, notice of such amendments will be given to the
Luxembourg Stock Exchange and to the Noteholders in accordance with Section
1.08 hereof and by publication of a notice in Luxembourg in a general leading
daily newspaper, which is expected to be the Luxembourg Wort.


                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

         SECTION 13.01    Company's Option to Effect Defeasance or Covenant
                          Defeasance.

         The Company may, at its option by Board Resolution, at any time, with
respect to the Notes, elect to have either Section 13.02 or Section 13.03 be
applied to all Outstanding Notes upon compliance with the conditions set forth
below in this Article.  The Company shall promptly give notice of such election
to the Trustee.

         SECTION 13.02    Legal Defeasance and Discharge.

         Upon the Company's exercise under Section 13.01 of the option
applicable to this Section 13.02, the Company shall be deemed to have been
discharged from its obligations with respect to





                                       74
<PAGE>   85
all Outstanding Notes on the date the conditions set forth in Section 13.04 are
satisfied (hereinafter, "legal defeasance").  For this purpose, such legal
defeasance means that the Company shall be deemed to have paid and discharged
the entire indebtedness represented by the Outstanding Notes, which shall
thereafter be deemed to be "Outstanding" only for the purposes of Section 13.05
and the other Sections of this Indenture referred to in (A) and (B) below, and
to have satisfied all its obligations under such Notes, including the
obligation to pay interest on the Notes, and this Indenture insofar as such
Notes are concerned (and the Trustee, at the expense of the Company, shall
execute proper instruments acknowledging the same), except for the following
which shall survive until otherwise terminated or discharged hereunder:  (A)
the rights of Holders of Outstanding Notes to receive, solely from the trust
fund described in Section 13.04 and as more fully set forth in such Section,
payments in respect of the principal of and interest on such Notes when such
payments are due, (B) the Company's obligations with respect to such Notes
under Sections 3.04, 3.05, 3.08, 10.02 and 10.03 and with respect to the
Trustee under Section 6.06, (C) the rights, powers, trusts, duties and
immunities of the Trustee hereunder and (D) this Article.  Subject to
compliance with this Article, the Company may exercise its option under this
Section 13.02 notwithstanding the prior exercise of its option under Section
13.03 with respect to the Notes.

         SECTION 13.03    Covenant Defeasance.

         Upon the Company's exercise under Section 13.01 of the option
applicable to this Section 13.03, the Company shall be released from its
obligations under any covenant contained in Sections 10.04 through 10.15 with
respect to the Outstanding Notes on and after the date the conditions set forth
in Section 13.04 are satisfied (hereinafter, "covenant defeasance"), and the
Notes shall thereafter be deemed not to be "Outstanding" for the purposes of
any request, demand, authorization, direction, declaration, notice, consent,
waiver or Act of Noteholders (and the consequences of any thereof) in
connection with such covenants, but shall continue to be deemed "Outstanding"
for all other purposes hereunder.  For this purpose, such covenant defeasance
means that, with respect to the Outstanding Notes, the Company may omit to
comply with and shall have no liability in respect of any term, condition or
limitation set forth in any such covenant, whether directly or indirectly, by
reason of any reference elsewhere herein to any such covenant or by reason of
any reference in any such covenant to any other provision herein or in any
other document and such omission to comply shall not constitute a Default or an
Event of Default under Section 5.01(d), but, except as specified above, the
remainder of this Indenture and such Notes shall be unaffected thereby.

         SECTION 13.04    Conditions to Legal Defeasance or Covenant
                          Defeasance.

         The following shall be the conditions to application of either Section
13.02 or Section 13.03 to the Outstanding Notes:

                 (a)      The Company shall irrevocably have deposited or
         caused to be deposited with the Trustee (or another trustee satisfying
         the requirements of Section 6.07 who shall agree to comply with the
         provisions of this Article applicable to it) as trust funds in trust
         for the





                                       75
<PAGE>   86
         purpose of making the following payments, specifically pledged as
         security for, and dedicated solely to, the benefit of the Holders of
         such Notes, (A) money, which may include funds distributed from the
         Segregated Account, in an amount, or (B) U.S. Government Obligations
         which through the scheduled payment of principal and interest in
         respect thereof in accordance with their terms will provide, not later
         than one day before the due date of any payment, money in an amount,
         or (C) a combination thereof, sufficient, in the opinion of a
         nationally recognized firm of independent public accountants expressed
         in a written certification thereof delivered to the Trustee, to pay
         and discharge, and which shall be applied by the Trustee (or other
         qualifying trustee) to pay and discharge, the principal of and
         interest on the Outstanding Notes on the Stated Maturity (or
         Redemption Date, if applicable) of such principal or instalment of
         interest; provided that the Trustee shall have been irrevocably
         instructed to apply such money or the proceeds of such U.S. Government
         Obligations to said payments with respect to the Notes; and provided
         further that, upon the effectiveness of this Section 13.04, the money
         or U.S. Government Obligations deposited shall not be subject to the
         rights of the Noteholders pursuant to the provisions of this Article.
         Before or after such a deposit, the Company may give to the Trustee,
         in accordance with Section 11.03 hereof, a notice of its election to
         redeem all of the Outstanding Notes at a future date in accordance
         with Article Eleven hereof, which notice shall be irrevocable.  Such
         irrevocable redemption notice, if given, shall be given effect in
         applying the foregoing.

                 (b)      No Default or Event of Default with respect to the
         Notes shall have occurred and be continuing on the date of such
         deposit or, insofar as paragraphs (h) and (i) of Section 5.01 hereof
         are concerned, at any time during the period ending on the 91st day
         after the date of such deposit (it being understood that this
         condition shall not be deemed satisfied until the expiration of such
         period).

                 (c)      No event or condition shall exist that pursuant to
         the provisions of Section 13.02 or 13.03 would prevent the Company
         from making payments of the principal of or interest on the Notes on
         the date of such deposit or at any time during the period ending on
         the 91st day after the date of such deposit (it being understood that
         this condition shall not be deemed satisfied until the expiration of
         such period).

                 (d)      Such legal defeasance or covenant defeasance shall
         not result in a breach or violation of, or constitute a default under
         any material agreement or instrument to which the Company is a party
         or by which it is bound.

                 (e)      In the case of an election under Section 13.02, the
         Company shall have delivered to the Trustee an Opinion of Counsel
         stating that  the Holders of the Outstanding Notes will not recognize
         income, gain or loss for federal income tax purposes as a result of
         such defeasance and will be subject to federal income tax on the same
         amounts, in the same manner and at the same times as would have been
         the case if such defeasance had not occurred.





                                       76
<PAGE>   87
                 (f)      The Company shall have delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent provided for relating to either the legal
         defeasance under Section 13.02 or the covenant defeasance under
         Section 13.03 (as the case may be) have been complied with.

         SECTION 13.05    Deposited Money and U.S. Government Obligations to Be
                          Held in Trust; Other Miscellaneous Provisions.

         Subject to the provisions of the last paragraph of Section 10.03, all
money and U.S. Government Obligations (including the proceeds thereof)
deposited with the Trustee (or other qualifying trustee) (collectively for
purposes of this Section 13.05, the "Trustee") pursuant to Section 13.04 in
respect of the Outstanding Notes shall be held in trust and applied by the
Trustee, in accordance with the provisions of such Notes and this Indenture, to
the payment, either directly or through any Paying Agent (including the Company
acting as its own Paying Agent) as the Trustee may determine, to the Holders of
such Notes of all sums due and to become due thereon in respect of principal
and interest, but such money and U.S. Government Obligations need not be
segregated from other funds except to the extent required by law.

         The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 13.04 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is
for the account of the Holders of the Outstanding Notes.

         Anything in this Article to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon Company Request any
money or U.S. Government Obligations held by it as provided in Section 13.04
which, in the opinion of a nationally recognized firm of independent public
accountants expressed in a written certification thereof delivered to the
Trustee, are in excess of the amount thereof which would then be required to be
deposited to effect an equivalent legal defeasance or covenant defeasance, as
applicable, in accordance with this Article.

         SECTION 13.06    Reinstatement.

         If the Trustee or any Paying Agent is unable to apply any money or
U.S. Government Obligations in accordance with Section 13.05 by reason of any
order or judgment of any court or governmental authority enjoining, restraining
or otherwise prohibiting such application, then the Company's obligations under
this Indenture and the Notes shall be revived and reinstated as though no
deposit had occurred pursuant to Section 13.02 or 13.03, as the case may be,
until such time as the Trustee or Paying Agent is permitted to apply all such
money or U.S. Government Obligations in accordance with Section 13.05;
provided, however, that no action taken in good faith by the Company after a
deposit of money or U.S. Government Obligations or both pursuant to Section
13.05 and prior to the revival and reinstatement of obligations under this
Indenture and the Notes pursuant to this Section 13.06 shall constitute the
basis for the assertion of an Event of Default pursuant to Section 5.01; and
provided, further, that if the Company makes any payment of principal





                                       77
<PAGE>   88
of or interest on any Note following the reinstatement of its obligations, the
Company shall be subrogated to the rights of the Holders of such Notes to
receive such payment from the money or U.S. Government Obligations held by the
Trustee or Paying Agent.


                                ARTICLE FOURTEEN

                               SENIORITY OF NOTES

         SECTION 14.01    Seniority of the Notes.

         The Company's obligations under the Notes and the Coupons and
hereunder do and will rank at all times at least pari passu with all other
present and future Indebtedness of the Company (including the Company's 6.5%
Senior Convertible Notes Due 2000) and shall be superior in rank to all
existing and future Subordinated Obligations.  The Company covenants and agrees
that, except with respect to any Lien, the Indebtedness represented by the
Notes and the Coupons and the payment of the principal of and interest on each
and all of the Notes and Coupons are hereby expressly made pari passu to all
other present and future Indebtedness other than all Subordinated Obligations.


                                ARTICLE FIFTEEN

                           IMMUNITY OF INCORPORATORS,
                      STOCKHOLDERS, OFFICERS AND DIRECTORS

         SECTION 15.01    Liability Solely Corporate.

         No recourse shall be had for the payment of the principal of or
interest on any Notes or any part thereof, or for any claim based thereon or
otherwise in respect thereof, or of the indebtedness represented thereby, or
upon any obligation, covenant or agreement of this Indenture, against any
incorporator, or against any stockholder, officer or director, as such, past,
present or future, of the Company, or of any predecessor or successor Person,
either directly or through the Company or any such predecessor or successor
Person, whether by virtue of any constitution, statute or rule of law, or by
the enforcement of any assessment or penalty or otherwise, it being expressly
agreed and understood that this Indenture and all the Notes are solely
corporate obligations, and that no personal liability whatsoever shall attach
to, or be insured by, any such incorporator, stockholder, officer or director,
as such, past, present or future, of the Company or of any predecessor or
successor Person, either directly or through the Company or any such
predecessor or successor Person, because of the indebtedness hereby authorized
or under or by reason of any of the obligations, covenants, promises or
agreements contained in this Indenture or in any of the Notes or to be implied
herefrom or therefrom; and that any such personal liability is hereby expressly
waived and released as a condition of, and as part of the consideration for,
the execution of this Indenture and the issue of the Notes;





                                       78
<PAGE>   89
provided, however, that nothing herein or in the Notes contained shall be taken
to prevent recourse to and the enforcement of the liability, if any, of any
stockholder or subscriber to capital stock of the Company upon or in respect of
shares of capital stock not fully paid up.

         This Indenture may be signed in any number of counterparts each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same Indenture.

         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed, all as of the day and year first above written.

                                       HARKEN ENERGY CORPORATION
                                       
                                       
                                       
                                       By: /s/ Larry E. Cummings             
                                          -----------------------------------
                                       Name: Larry E. Cummings             
                                            ---------------------------------
                                       Title: Vice President and Secretary
                                             --------------------------------
                                       
                                       MARINE MIDLAND BANK,
                                          as Trustee
                                       
                                       
                                       
                                       By: /s/ C. Baldry 
                                          -----------------------------------
                                       Name: C. Baldry                       
                                            ---------------------------------
                                       Title: Transaction Manager            
                                             --------------------------------
                                              under Power of Attorney      
                                             --------------------------------





                                       79

<PAGE>   1
                                                                    EXHIBIT 10.2



                           HARKEN ENERGY CORPORATION


                              Up to US$70,000,000

                     5.5% Senior Convertible Notes Due 2002


                               PLACING AGREEMENT


                                  June 3, 1997
<PAGE>   2
                                    CONTENTS


<TABLE>
<CAPTION>
Clause  Heading
- ------  -------
                                                                                                                      Page
                                                                                                                      ----
<S>                                                                                                                    <C>
1.        Interpretation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1

2.        Release of the Press Announcement and Delivery of Documents . . . . . . . . . . . . . . . . . . . . . . . .   3

3.        Placing of the Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4

4.        Representations and Warranties of the Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4

5.        The Placing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    10

6.        Undertakings of the Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    10

7.        Indemnification and Contribution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12

8.        Fees and Expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14

9.        Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16

10.       Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17

11.       Survival  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18

12.       Time  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18

13.       Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18

14.       Governing Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20

The Schedule  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
</TABLE>
<PAGE>   3
THIS AGREEMENT is made on June 3, 1997, BETWEEN

          (1)    HARKEN ENERGY CORPORATION (the "Company");

          (2)    HSBC INVESTMENT BANK PLC ("HSBC"), RAUSCHER PIERCE & CLARK,
                 INC. and RAUSCHER PIERCE & CLARK LIMITED (together "RPC")
                 (together with HSBC, the "Lead Managers"); and

          (3)    BANCA DEL GOTTARDO, JEFFERIES INTERNATIONAL LIMITED and
                 INVESTMENTBANK AUSTRIA A.G. (together with the Lead Managers,
                 the "Managers").

WHEREAS

          (A)    The Company has authorised the creation and issue of up to
U.S.$70,000,000 in aggregate principal amount of 5.5% Senior Convertible Notes
Due 2002 (the "Notes").  The Notes will be in bearer form and are to be
convertible into shares of the common stock (the "Common Stock") of the Company
(the "Shares") at the Conversion Price of U.S.$5.00.

          (B)    The Notes will be in the denominations of U.S.$10,000 and
U.S.$50,000, and integral multiples thereof.  The Notes will initially be
represented by a temporary global bearer note (the "Global Note") which will be
exchangeable for bearer notes in definitive form ("Bearer Notes"), with
interest coupons ("Coupons") attached, in the circumstances specified in the
Global Note.

          (C)    The Notes will be subject to and have the benefit of a trust
indenture (the "Trust Indenture"), a draft of which is in the agreed form and
to which will be scheduled the forms of the Global Note and the Bearer Notes.
The Trust Indenture, will be made between the Company and Marine Midland Bank
(the "Trustee") as trustee for the holders of the Notes from time to time.

          (D)    The Company will, in relation to the Notes, enter into a
paying and conversion agency agreement (the "Agency Agreement") with Midland
Bank plc (the "Principal Paying Agent", "Principal Conversion Agent" and
"Authenticating Agent"), Kredietbank S.A. Luxembourgeoise (the "Listing Agent",
"Luxembourg Paying Agent" and "Luxembourg Conversion Agent") and Swiss Bank
Corporation (a "Paying Agent" and "Conversion Agent") and the Trustee, a draft
of which is in the agreed form.

          (E)    The Lead Managers have conditionally agreed on and subject to
the terms hereof to act as agent for the Company to use their best efforts to
procure Placees for all the Notes.  The Issue is not underwritten.


IT IS AGREED as follows:

1.        Interpretation

          1.1    Definitions: In this Agreement, in addition to the definitions
contained in the recitals, the following expressions have the following
meanings:





                                       1
<PAGE>   4
         "agreed form" means that the form of the document in question has
         been agreed between the proposed parties thereto and by the parties
         hereto prior to the Closing Date and (for the purposes of
         identification signed by or on behalf of) each of such parties and
         that either a copy thereof has been signed for the purpose of
         identification on behalf of Bracewell & Patterson, L.L.P. or such
         document has been signed on behalf of the parties thereto and
         delivered to Bracewell & Patterson, L.L.P. to be held in escrow
         pending release on the Closing Date;

         "AMEX" means The American Stock Exchange, Inc.;

         "Cedel" means Cedel Bank, societe anonyme;

         "Closing Date" means, subject to Clause 9.2, June 11, 1997;

         "Conditions" means the terms and conditions of the Notes as scheduled  
         to the agreed form of the Trust Indenture as the same may be modified
         prior to the Closing Date, and any reference to a numbered "Condition"
         is to a correspondingly numbered provision thereof;

         "Conversion Price" has the meaning given to it in Condition 6;

         "Euroclear" means Morgan Guaranty Trust Company of New York, Brussels
         office, as operator of the Euroclear System;

         "Event of Default" means one of those events specified in Condition 12;

         "Issue" means the proposed issue of the Notes described in the Offering
         Circular;

         "Issue Documents" means the Trust Indenture and the Agency Agreement;

         "Issue Price" means 100 percent of the aggregate principal amount of
         the Notes;

         "Lien" has the meaning given to it in the Trust Indenture;

         "Offering" means the offering of the Notes pursuant to the Offering
         Circular;

         "Offering Circular" means the preliminary offering circular dated May
         28, 1997, as amended by the final offering circular, including all
         documents incorporated by reference therein to the extent such
         documents are not superseded in the Offering Circular prepared in
         connection with the Issue, as the same may be amended or supplemented
         on or before the Closing Date;

         "Placees" has the meaning given to it in Clause 5.1;

         "Placement" means the offering of Notes made pursuant to the Offering
         Circular;

         "Person" has the meaning given to it in the Trust Indenture;

         "Press Announcement" means the press announcement to be mutually agreed
         by the Company and the Lead Managers;





                                       2
<PAGE>   5

         "Principal Subsidiary" has the meaning given to it in the Trust
         Indenture;

         "Restricted Period" means the period commencing on the day after the
         Closing Date and continuing for a period of forty days; it being
         understood that in accordance with the terms of the Notes in the event
         that Regulation S under the Securities Act is amended and such
         amendment is deemed applicable to the Notes, the term "Restricted
         Period" with respect to the Notes shall be subject to extension as
         then required by Regulation S as amended;

         "Securities Act" means the United States Securities Act of 1933, as
         amended;

         "Stabilising Manager" means HSBC, acting in the capacity as stabilising
         manager;

         "Subsidiary" has the meaning given to it in the Trust Indenture;

         "U.S.$" and "U.S. dollars" denote the lawful currency for the time
         being of the United States of America; and

         "Warrant Shares" means the shares of Common Stock of the Company
         issuable upon exercise of the Lead Manager Warrants.

         1.2     Clauses and Schedules: Any reference in this Agreement to a
         Clause or a Schedule is, unless otherwise stated, to a clause hereof
         or a schedule hereto.

         1.3     Headings: Headings and sub-headings are for ease of reference
         only and shall not affect the construction of this Agreement.

2.       Release of the Press Announcement and Delivery of Documents

         2.1     On or immediately following the Closing Date, the Company
         shall release the Press Announcement in the agreed form to the press
         in compliance with Regulation S of the Securities Act and shall
         subsequently file a Report on Form 8-K describing the Offering, as
         required and when due in accordance with the terms of the form.

         2.2     The Company shall as soon as practicable following execution
         of this Agreement and in any event, subject to Clause 2.3, by no later
         than 10.00 a.m. (London time) on the Closing Date, deliver, or procure
         that there are delivered, to the Lead Managers, in the agreed form:

         (a)     the Issue Documents;

         (b)     a legal opinion of Haynes and Boone, L.L.P.;

         (c)     the closing certificates of the Company; and

         (d)     the auditors comfort letter.

         2.3     The Lead Managers may, in their discretion, waive the
         requirement that the Company deliver to them any of the documents
         listed in Clause 2.2 or may extend the time for delivery of





                                       3
<PAGE>   6
         any of the documents.  Any waiver or extension may be granted by the
         Lead Managers subject to such conditions as they determine.

3.       Placing of the Notes

         3.1     The Company undertakes to the Managers that:

         (a)     subject to and in accordance with the provisions of this
         Agreement, the Company will issue the Notes on the Closing Date, in
         accordance with this Agreement and the Trust Indenture; and

         (b)     the Company will, execute and deliver the Issue Documents on
         the Closing Date.

         3.2     In connection with this issue, the Stabilising Manager may
         over-allot or effect transactions which stabilise or maintain the
         market price of the Notes at a level which might not otherwise
         prevail.  Such stabilising, if commenced, may be discontinued at any
         time.  Such stabilising shall be conducted in accordance with all
         applicable laws and rules.  Any loss or profit sustained as a
         consequence of any such over-allotment or stabilising shall, as
         against the Company, be for the account of the Managers.  The Managers
         acknowledge that the Company has not authorised the creation and issue
         of Notes in excess of U.S.$70,000,000 in aggregate principal amount.

         3.3     Each Manager warrants and represents to the Company and each
         other Manager that each contract note in the agreed form executed by
         such Manager selling the Notes shall contain the following legend:

         "Neither the Notes nor the Shares of Common Stock issuable upon
         conversion of the Notes have been or will be registered under the
         United States Securities Act of 1933, as amended (the "Securities
         Act"), and the Notes and the Shares may not be offered, sold,
         transferred, pledged, converted or otherwise disposed of in the U.S.
         or to, or for the account or benefit of, any "U.S. person" unless the
         Notes and the Shares have been registered under the Securities Act and
         any applicable state securities or blue sky laws or exemptions from
         the registration requirements of such laws are available.

         Any United States person who holds this obligation will be subject to
         limitations under the U.S. income tax laws, including the limitations
         provided in Sections 165(j) and 1287(a) of the United States Internal
         Revenue Code of 1986, as amended".

4.       Representations and Warranties of the Company

         4.1     The Company represents and warrants to the Managers, in their
         capacity as Managers and as representatives of each of the Holders of
         the Notes, that:

         (a)     the Company is duly incorporated and in good standing under
         the laws of the State of Delaware and has the requisite power and
         authority to create, issue, offer and  sell the Notes, to execute this
         Agreement and each of the Issue Documents and to undertake and perform
         its obligations herein and therein.  Neither the Company nor any
         Principal Subsidiary has commenced





                                       4
<PAGE>   7

         voluntary  or involuntary proceedings to effect the winding up,
         liquidation or dissolution of the Company;

         (b)     each Principal Subsidiary of the Company is (i) a corporation
         duly organized, validly existing and in good standing under the laws
         of its jurisdiction of incorporation or establishment, (ii) has all
         requisite power and authority and all necessary licenses and permits
         to own and operate its Properties and to carry on its business as now
         conducted and as presently proposed to be conducted, except as would
         not have a material adverse effect on the Company and the Subsidiaries
         taken as a whole, and (iii) is duly licensed or qualified and is
         authorized to do business and is in good standing as a foreign
         corporation in each jurisdiction where the character of its Properties
         or the nature of its activities makes such licensing or qualification
         necessary, except as would not have a material adverse effect on the
         Company and the Subsidiaries taken as a whole;.  None of the Principal
         Subsidiaries nor any other party has commenced voluntary or
         involuntary proceedings to effect the winding up, liquidation or
         dissolution of any of the Principal Subsidiaries;

         (c)     the authorized and outstanding capital stock of the Company is
         as set out in the Offering Circular, and all of the issued Shares have
         been duly and validly authorized and issued and are fully paid and
         non-assessable.  All of the outstanding shares of capital stock of the
         Subsidiaries have been duly and validly authorized and issued and are
         fully paid and non-assessable.  All of the outstanding shares of
         capital stock of each Principal Subsidiary are owned directly or
         indirectly by the Company free and clear of any Liens.  Except as
         disclosed in the Offering Circular, the Company does not own, directly
         or indirectly, any equity or debt securities of any other company,
         corporation, partnership, joint venture or other entity which are
         material to the business or operations of the Company.  Except as
         disclosed in the Offering Circular or the documents incorporated by
         reference therein, at the date hereof and at the Closing Date, there
         are and will not be any outstanding options, warrants or other rights
         to purchase any Shares of the Company;

         (d)     the execution, delivery and performance of this Agreement and
         the Issue Documents has been duly authorized by all requisite
         corporate action of the Company;

         (e)     the creation, offer, sale and issue of the Notes, the
         execution of this Agreement and the Issue Documents and the
         undertaking and performance by the Company of the obligations
         expressed to be assumed by it herein and therein will not violate:

                 (i)      the Certificate of Incorporation or By-laws of the
                          Company;

                 (ii)     assuming compliance by the Managers with the United
                          States securities law requirements set forth in the
                          Schedule, any law applicable to the Company or any
                          Principal Subsidiary or any rule, regulation or order
                          of any court or governmental agency or body having
                          jurisdiction over the Company or any Principal
                          Subsidiary; or

                 (iii)    any provision of any indenture, mortgage, agreement,
                          contract or other instrument to which the Company or
                          any Principal Subsidiary is a party or by which the
                          Company or any Principal Subsidiary is bound or to
                          which any of the properties or assets of the Company
                          or any Principal Subsidiary are subject, or be in
                          conflict





                                       5
<PAGE>   8
                          with, or result in a breach of or constitute (upon
                          notice or lapse of time or both) a default under any
                          such indenture, mortgage, agreement, contract or
                          other instrument or result in the creation or
                          imposition of any Lien upon any of the properties or
                          assets of the Company or any Principal Subsidiary
                          (except any such violation or conflict described
                          therein or herein which would not have a material
                          adverse effect on the Company and its Subsidiaries,
                          taken as a whole);

         (f)     (i)      this Agreement constitutes;

                 (ii)     upon due execution by or on behalf of the Company and
                          the other parties thereto, the Issue Documents will
                          constitute; and

                 (iii)    upon due execution of the Trust Indenture, the Global
                          Note and the Bearer Notes by or on behalf of the
                          Company and the other parties thereto and due
                          authentication of the Global Note and the Bearer
                          Notes, the Notes will constitute:

         legal, valid, binding and enforceable obligations of the Company,
         enforceable against the Company in accordance with their respective
         terms, except that the enforceability thereof may be limited by any
         applicable bankruptcy, insolvency, reorganisation or other similar
         laws relating to or affecting the enforcement of creditors' rights
         generally and by equitable principles regardless of whether such
         enforceability is considered in a proceeding in equity or at law and
         except as rights to indemnity or contribution may be limited under
         applicable law;

         (g)     Each of the Global Note, the Bearer Notes, the Coupons and the
         Shares conform in all material respects to the description of such
         Global Note, Bearer Notes, Coupons and Shares contained in the
         Offering Circular, and the Shares conform to the terms of the Common
         Stock contained in the Certificate of Incorporation;

         (h)     upon issuance of the Notes in accordance with the Trust
         Indenture, the Notes will constitute direct, general and unconditional
         obligations of the Company which:

                 (i)      rank pari passu among themselves and with the 6.5%
                          Senior Convertible Notes Due 2000 of the Company, and
                          with all present and future Indebtedness other than
                          Subordinated Obligations and Indebtedness secured by
                          Liens (all as defined in the Trust Indenture) of the
                          Company; and

                 (ii)     will rank senior to all existing and future
                          Subordinated Obligations (as defined in the Trust
                          Indenture), except to the extent permitted by the
                          applicable laws relating to creditors' rights;

         (i)     the Shares, as and when issued by the Company from time to
         time  pursuant to conversion of the Notes in accordance with the terms
         of the Issue Documents, will be validly issued and outstanding, fully
         paid and non- assessable and will not be subject to any pre-emptive or
         similar right, and the Holder of each Note will receive good and valid
         title to the Shares upon conversion of such Note in accordance with
         the terms of the Issue Documents, free and clear of any Lien, except
         such as may have been created by the Holder of the Note and such
         restrictions on transfer as may be imposed under United States federal
         or state securities or blue sky laws.  Other than the





                                       6
<PAGE>   9
         approval of the listing of the Shares by AMEX and any applicable
         registration requirements, no consent or approval by the stockholders
         of the Company or any other Person is required to be obtained by the
         Company for the consummation of the issuance of the Shares by the
         Company pursuant to conversion of the Notes.  As and from the expiry
         of the Restricted Period (so long as not extended) (i) each stock
         certificate representing any of the Shares shall be free of any type
         of restrictive legend, (ii) the Shares represented by each such stock
         certificate shall not be subject to any "stop transfer" or similar
         order at the Company's transfer agent for its Common Stock, and (iii)
         the Company shall have filed with the AMEX or Alternative Stock
         Exchange all necessary filings in respect of the inclusion of the
         Shares in the shares of Common Stock of the Company listed for trading
         on the AMEX or Alternative Stock Exchange;

         (j)     upon delivery to the Lead Managers, the Lead Manager Warrants
         (as defined in Clause 8.2 hereof) will be duly issued and will
         constitute the legal, valid and binding obligations of the Company,
         enforceable against the Company in accordance with their terms, except
         as the enforceability thereof may be limited by any applicable
         bankruptcy, insolvency, reorganization or other similar laws relating
         to or affecting the enforcement of creditors' rights, regardless of
         whether such enforceability is considered in a proceeding in equity or
         at law.  The shares of Common Stock issuable upon exercise of the Lead
         Manager Warrants have been duly and validly authorized for issuance in
         accordance with the terms of the Warrants and reserved for issuance to
         the extent authorized by applicable law.  The shares of Common Stock
         issuable upon exercise of Lead Manager Warrants, as and when issued
         and delivered in accordance with the terms thereof, and upon receipt
         by the Company of the exercise price therefor, will be duly and
         validly issued and outstanding, fully paid and non- assessable, and
         will not be subject to any pre-emptive or similar right;

         (k)     assuming compliance by the Managers with the United States
         securities law requirements as set out in the Schedule and other than
         the approval of AMEX, all authorizations, consents and approvals
         required by the Company for or in connection with the creation and
         issue of the Notes, the execution of this Agreement and the Issue
         Documents, the performance by the Company of the obligations
         undertaken by it herein and therein and the distribution of the
         Offering Circular in accordance with the provisions set out in the
         Schedule have been obtained and are in full force and effect;

         (l)     neither the nature of the Company nor of any Subsidiary, nor
         of any of their respective businesses or Properties, nor any
         relationship between the Company or any Subsidiary and any other
         Person, nor any circumstance in connection with the execution and
         delivery of the Indenture or the offer, issue, sale or delivery of the
         Global Note, or the Bearer Notes, or the Shares is such as to require
         a consent, approval or authorization of, or filing, registration or
         qualification with, any governmental authority on the part of the
         Company as a condition to the execution and delivery of this Indenture
         or the offer, issue, sale or delivery of the Global Note or the Bearer
         Notes or the issuance of Shares pursuant to conversion of the Notes;

         (m)     the Offering Circular sets forth a description of the business
         conducted and proposed to be conducted as of the date thereof by the
         Company orits Principal Subsidiaries, and the principal Properties of
         the Company or its Principal Subsidiaries, which description is true
         and correct in all material respects.  The Company shall use its best
         efforts to ensure that the Offering Circular will comply with the
         requirements of the Luxembourg Stock Exchange on the Closing Date;





                                       7
<PAGE>   10
         (n)     each of the Company and  its Principal Subsidiaries, has (i)
         Good Title to its Oil and Gas Properties and (ii) good and defensible
         title to all other material Properties and assets described in the
         Offering Circular as owned by it, in the case of such other Properties
         and assets free and clear of all Liens, except as disclosed in the
         Offering Circular or which are not material to the business of the
         Company and its Subsidiaries taken as a whole or which will not
         conflict with the obligations of the Company under this Agreement, the
         Issue Documents and the Notes.  Each of the Company and its
         Subsidiaries has a valid, subsisting lease for the real Property
         (other than its Oil and Gas Properties, subject to clause (i) of this
         sentence) described in the Offering Circular as leased by it.  To the
         knowledge of the Company's management, except as otherwise disclosed
         in the Offering Circular, the Company and each of its Subsidiaries
         owns or possesses or is the valid licensee of all patents, trademarks,
         service marks, trade names, copyrights and other intellectual property
         necessary to carry on its business as described in the Offering
         Circular, and neither the Company nor any Subsidiary has received any
         notice of infringement of or conflict with asserted rights of others
         with respect to any of the foregoing which, if the subject of an
         unfavourable decision, ruling or finding, would result, individually
         or in the aggregate, in any material adverse change in, or which would
         materially and adversely affect the business, operations, financial
         position or business prospects of, the Company and its Subsidiaries
         taken as a whole;

         (o)     based on the laws currently in effect and subject to the
         provisos set forth in the Offering Circular, all payments of principal
         and interest in respect of the Notes and the Coupons, and all other
         payments that may become due and payable under the terms of the Notes
         or the Coupons may be made free and clear of, and without withholding
         or deduction for, any taxes, duties, assessments or governmental
         charges of any nature whatsoever imposed, levied, collected, withheld
         or assessed by United States federal and state taxing authorities or
         any political subdivision or authority thereof or therein having power
         to tax other than in the case of payments to be made by the Company to
         U.S. persons in circumstances where the Company is obliged to withhold
         payments due to U.S. back-up withholding tax but not gross-up under
         Condition 9;

         (p)     the Offering Circular is true and accurate in all material
         respects and is not misleading in any material respect in light of the
         circumstances under which they were made; any opinions, predictions or
         intentions expressed in the Offering Circular are true and honestly
         held or made and are not misleading in any material respect and have
         been made after due and careful consideration of all relevant factors
         known to the Company; the Offering Circular does not contain any
         untrue statement of a material fact and does not omit to state any
         material fact necessary to make such information not misleading in any
         material respect in light of the circumstances under which they were
         made; provided, that this representation and warranty shall not apply
         to any statement or omission relating to matters of foreign law or
         made in reliance and in conformity with information furnished in
         writing to the Company by any Manager for use in the Offering
         Circular;

         (q)     the Company will use the proceeds from the sale of the Notes
         for the purposes described in the Offering Circular;

         (r)     neither the Company nor any of its Subsidiaries is, directly
         or indirectly, controlled by, or acting on behalf of any Person which
         is, an "investment company" or an "affiliated person" of, "promoter"
         or "principal" of an "investment company," within the meaning of the
         Investment Company Act of 1940, as amended;





                                       8
<PAGE>   11
         (s)     neither the Company nor any of its Subsidiaries is a "holding
         company" within the meaning of the Public Utility Holding Company Act
         of 1935, as amended, or a "public utility" within the meaning of the
         Federal Power Act, as amended;

         (t)     except as disclosed in the Offering Circular at the date
         hereof or at the date when this representation is deemed to be
         repeated, as the case may be, there are no actions, suits,
         investigations or proceedings pending to which the Company or any
         Principal Subsidiary is a party before or by any court or governmental
         agency or body, which would result, individually or in the aggregate,
         in any material adverse change in the financial condition or results
         of operations of the Company and its Subsidiaries, taken as a whole,
         or which would materially and adversely affect the properties or
         assets of the Company, its subsidiaries or any branch thereof, and to
         the knowledge of the Company, no such actions, suits, investigations
         or proceedings are threatened by any Person;

         (u)     except as disclosed in the Offering Circular and since
         December 31, 1996 there has been no adverse change, or any development
         reasonably likely to involve an adverse change, in the condition
         (financial or otherwise) or general affairs of the Company that is
         material in the context of the issue of the Notes; and

         (v)     to the knowledge of the Company, no event has occurred which
         is or would (with the passage of time, the giving of notice, the
         making of any determination or otherwise) become an Event of Default.

         4.2     The Company's consolidated audited financial statements
         including its statement of operations for the three fiscal years ended
         December 31, 1994, December 31, 1995 and December 31, 1996,
         respectively, and its balance sheets at December 31, 1994, December
         31, 1995 and December 31, 1996, and the related consolidated
         statements of operations, stockholders' equity and cash flows of the
         Company and its Subsidiaries for the fiscal years ended on such dates,
         were prepared in accordance with generally accepted accounting
         principles in the United States consistently applied and present
         fairly (in conjunction with the notes thereto) the financial condition
         of the Company and its Subsidiaries (taken as a whole) as at the date
         they were prepared and the results of the operations of the Company
         and its Subsidiaries (taken as a whole) during the respective fiscal
         years then ended.  The Company's unaudited condensed consolidated
         financial statements, including its statement of operations for the
         quarterly period ended March 31, 1997, and its balance sheet at March
         31, 1997, and related condensed statements of stockholders' equity and
         cash flows of the Company and its Subsidiaries for the period ended on
         such date contain all adjustments necessary to present fairly the
         Company's financial position as of March 31, 1997 and the results of
         its operations and changes in cash flows for the quarterly period then
         ended.  Except as set forth in the Offering Circular, since March 31,
         1997, there has been no change in the properties, business, profits or
         condition (financial or otherwise) of the Company and its Subsidiaries
         except changes in the ordinary course of business, none of which
         individually or in the aggregate have had a material adverse effect on
         the properties, business, assets, profits or financial condition of
         the Company and its Subsidiaries taken as a whole.

         4.3     The Company shall forthwith notify the Lead Managers of
         anything which at any time prior to payment into the Segregated
         Account of the net proceeds of the issue of the Notes to the Company
         on the Closing Date has or may have rendered, or will or may render,
         untrue or incorrect





                                       9
<PAGE>   12
         in any material respect any representation and warranty by the Company
         in this Agreement as if it had been made or given at such time with
         reference to the facts and circumstances then subsisting.

         4.4     The representations and warranties in Clause 4.1 which refer
         to the Offering Circular shall be deemed to be repeated (with
         reference to the relevant text of the Offering Circular and to the
         facts and circumstances then subsisting) on each date falling on or
         before the Closing Date on which the Offering Circular is amended or
         supplemented and distributed by the Managers.

5.       The Placing

         5.1     The Lead Managers, relying on the representations and
         warranties given by the Company herein, hereby undertake to the
         Company that, subject to and in accordance with the provisions of this
         Agreement they will act as agent for the Company (which appointment
         the Company hereby confirms) to use their best efforts to procure
         qualified subscribers ("Placees") to subscribe for all of the Notes on
         the Closing Date at the Issue Price free from all Liens and with all
         rights attached thereto.  Neither of the Lead Managers shall have any
         obligations themselves to subscribe for any Notes.

         5.2     The Company hereby confirms that the foregoing appointment
         confers on the Lead Managers all powers, authorities and discretions
         on behalf of the Company which are reasonably necessary for or
         reasonably incidental to the making of the Issue on the basis set out
         in this Agreement, the Offering Circular and the Trust Indenture and
         hereby agrees to ratify and confirm everything which the Lead Managers
         shall lawfully and properly do in the exercise of, or in accordance
         with, such appointment, powers, authorities and discretions.

         5.3     The Lead Managers shall by no later than June 11, 1997 (or
         such later date as the Lead Managers and the Company may agree) notify
         the Company of the number of Notes, with an aggregate principal amount
         of up to U.S.$70,000,000, in respect of which subscription commitments
         have been obtained ("Placed Notes").

6.       Undertakings of the Company

         6.1     The Company shall deliver to the Managers on the date hereof
         and hereafter from time to time as requested as many copies of the
         Offering Circular as the Lead Managers may reasonably request.

         6.2     Without prejudice to their obligations under applicable law
         and the requirements of the Luxembourg Stock Exchange, the Company
         shall at the request of the Lead Managers at any time prior to payment
         of the net proceeds of the issue of the Notes to the Company on the
         Closing Date amend or supplement the Offering Circular in order to
         correct any untrue statement of 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 and the
         Company shall deliver to the Managers from time to time as many copies
         of the relevant amendment or supplement as the Managers may reasonably
         request.

         6.3     Except as requested by the Managers in connection with the
         sale of the Notes, neither the Company or any affiliate of the Company
         nor anyone acting on behalf of the Company or any such





                                       10
<PAGE>   13
         affiliate, other than the Managers shall, directly or indirectly,
         offer or sell, or attempt to offer, sell or dispose of, any of the
         Notes, or solicit any offer to buy, or otherwise approach or negotiate
         in respect of, any of the Notes.

         6.4     Assuming compliance with the terms of the Schedule by the
         Managers, the Company shall furnish such information, execute such
         instruments and take such action, if any, as may be required to effect
         the placement of the Notes under the securities laws of each
         jurisdiction in which the Notes are offered for sale or sold;
         provided, however, that with respect to the U.S. securities laws the
         foregoing shall only be in accordance with the safe harbor provided by
         Regulation S and in no event shall the Company be required to qualify
         to do business in any jurisdiction where it is not now so qualified or
         which would subject the Company to taxation or to take any action that
         would subject it to general or unlimited service of process in any
         jurisdiction where it is not now so subject.

         6.5     The Company shall furnish or make available to the Lead
         Managers or their counsel such additional documents  and information
         regarding the Company and its affairs as the Lead Managers may from
         time to time request, including any and all documentation reasonably
         requested in connection with their due diligence efforts regarding
         information in the Offering Circular and in order to evidence the
         accuracy or completeness of any of the conditions contained in this
         Agreement; and all actions taken by the Company to authorize the
         issuance and sale of the Notes and to reserve for issuance the shares
         of Common Stock issuable upon exercise of the Lead Manager Warrants
         shall be reasonably satisfactory in form and substance to the Lead
         Managers.

         6.6     The Company shall, at all times upon reasonable request from
         the date hereof through the Closing Date, (i) make available to each
         purchaser or its advisers, or both, prior to acceptance of its
         subscription, such information (in addition to that contained in the
         Offering Circular  concerning the Offering, the Company and any other
         relevant matters as it possesses or can acquire without unreasonable
         effort or expense, and (ii) provide each purchaser or its advisers, or
         both, the opportunity to ask questions of, and receive answers from,
         the Company with respect to such matters.

         6.7     The Company shall not offer or sell any securities of the same
         class as the Notes until a period of six (6) months has elapsed from
         the Closing Date of the Offering, unless the Company shall have
         provided the Lead Managers with a satisfactory opinion from the
         Company's legal counsel to the effect that the proposed offer or sale
         will not result in any violation of the Securities Act, any state
         securities or blue sky laws, and any rules or regulations promulgated
         thereunder.

         6.8     From the date hereof to and including the Closing Date, the
         Company shall not, make any press release or other public announcement
         (i) without the prior written consent of the Lead Managers, (ii) prior
         to having furnished each of the Lead Managers with a copy of the
         proposed form of the press release or public announcement and giving
         the Lead Managers and their counsel a reasonable opportunity to review
         and comment upon the same or (iii) in a manner to which the Lead
         Managers or their counsel shall reasonably object, unless the Company
         is required to do so by applicable law.





                                       11
<PAGE>   14
         6.9     The Company shall make arrangements reasonably satisfactory to
         the Lead Managers to ensure that the Bearer Notes are delivered to the
         Trustee or the Authenticating Agent for authentication in the form
         required by, and otherwise in accordance with, the Issue Documents.

         6.10    The Company shall use all reasonable endeavours to procure the
         listing of the Shares and the Warrant Shares on the AMEX or an
         Alternative Stock Exchange and to maintain the same until none of the
         Notes or Warrants, as the case may be, are outstanding.

         6.11    The Company shall use all reasonable endeavours to procure the
         listing of the Notes on the Luxembourg Stock Exchange and to maintain
         the same until none of the Notes are outstanding; provided, that, if
         it is impracticable or unduly burdensome to maintain the listing of
         the Notes on the Luxembourg Stock Exchange, the Company shall use all
         reasonable endeavours to procure and maintain as aforesaid a listing
         of or quotation for the Notes on such other stock exchange or
         exchanges as they may (with the approval of the Lead Managers and the
         Trustee) decide.

         6.12    The Company has agreed that if the Restricted Period has been
         lengthened because such amendments are applicable to the Notes, that
         it will register the issuance or resale of the Shares under the
         Securities Act as soon as practicable and maintain the effectiveness
         of a registration statement covering such Shares for such period of
         time as may be necessary to effectuate the resale of the Shares
         without regard to any such extension of the Restricted Period, in
         accordance with the Terms and Conditions of the Notes.

         6.13    In the event that any potential investor is contacted and
         introduced to the Company by the Managers during the Offering Period
         and such investor provides financing to the Company at any time during
         one (1) year from the Closing Date, the Managers shall be entitled to
         the same fees provided for in Clause 8.1 below with respect to such
         financing as if it had occurred as part of the Placement.

7.       Indemnification and Contribution

         7.1     The Company agrees to defend, indemnify, and hold each of the
         Managers and their respective officers, directors, agents, employees
         and controlling persons (each, an "Indemnified Person") harmless from
         and against any losses, claims, damages, or liabilities (including,
         without limitation, court costs and reasonable attorneys' fees) to
         which any Indemnified Person may become subject insofar as the same
         arises from an action which alleges or is based upon:

         (a)     any alleged untrue statement of a material fact contained in
         the Offering Circular, or omission of a material fact, or any other
         violation of applicable securities or other laws, rules and
         regulations; or

         (b)     the performance by each of the Managers of its obligations and
         services, or the performance by any other Indemnified Person on behalf
         of the Managers of any obligations hereunder in accordance with this
         Agreement or otherwise in connection with the subject matter hereof,
         including the issue of any material provided by the Company, or after
         having been approved by, the Managers; or





                                       12
<PAGE>   15
         (c)     any breach or alleged breach of or failure to comply with, the
         laws or regulations of the United States or of any other State thereof
         by the Company or any Affiliate resulting from the release of the
         Press Announcement, and the preparation and distribution of the
         Offering Circular; or

         (d)     any material breach or alleged material breach of any of the
         representations and warranties, or any of the undertakings or
         obligations of the Company;  or

         (e)     the creation, allotment, offer, sale, issue and placing of the
         Notes;

         irrespective of the role or concurrent negligence of such Indemnified
         Person, by the Company or its officers, directors, agents, employees
         and controlling persons and to reimburse such Indemnified Person for
         any legal or other expenses reasonably incurred by them in connection
         with investigating, settling or defending any action or claim in
         connection therewith (including, without limitation, court costs and
         reasonable attorneys' fees) up until such time as the Company assumes
         the defense of any such action or claim;  provided, however, that the
         Company shall not be liable in any such case to the extent that any
         such loss, claim, damage or liability (i) directly or indirectly
         results from any untrue statement of a material fact or omission of a
         material fact made in the Offering Circular in reliance upon and in
         conformity with written information provided to the Company by or on
         behalf of the Managers specifically for inclusion in such Offering
         Circular or (ii) is found in a final judgment of a court of competent
         jurisdiction to have resulted from the Indemnified Person's gross
         negligence or bad faith in performing their services hereunder.  If
         for any reason the foregoing indemnification is unavailable to the
         Indemnified Person or insufficient to hold the Indemnified Person
         harmless, then the Company shall contribute to the amount paid or
         payable by the Indemnified Person as a result of such loss, claim,
         damage, or liability in such proportion as is appropriate to reflect
         not only the relative benefits received by the Company on the one hand
         and the Indemnified Person on the other hand but also the relative
         fault of the Company and the Indemnified Person, as well as any
         relevant equitable considerations.  The Company agrees to reimburse
         the Indemnified Person within ten days after presentation of any
         statement by the Indemnified Person of all reasonable expenses
         (including without limitation of the generality of the foregoing, the
         reasonable fees and expenses of attorneys selected by the Indemnified
         Person) incurred in connection with any testimony the Indemnified
         Person or its employees are required to give (in court, before a
         regulatory agency, by deposition or otherwise) in any regulatory or
         court proceeding (including depositions), whether or not the
         Indemnified Person is a party, and which related directly or
         indirectly to the proposed Placement.  This indemnity shall be without
         prejudice to any other rights of any other Indemnified Person.

         7.2     With respect to the foregoing Clause 7.1 of the
         indemnification, the Company agrees that an Indemnified Person shall
         not be deemed to have been grossly negligent for reasonably relying
         upon any written untrue statement or alleged omission of a material
         fact necessary to make the statements, in light of the circumstances
         in which such statements were made, not misleading, contained in or
         omitted from any information provided to the Indemnified Person by or
         on behalf of the Company (including, without limitation of the
         generality of the foregoing, any accountant or attorney employed or
         retained by the Company).  The indemnification provided in the
         foregoing Clause 7.1 hereof shall extend upon the same terms and
         conditions to each Person, if any, who may be deemed to control the
         Indemnified Person and shall be applicable, to the extent set forth
         herein, whether or not negligence of the person entitled to
         indemnification is alleged or proven.





                                       13
<PAGE>   16
         7.3     Each Indemnified Person shall, in the event any action (with
         respect to which indemnity or reimbursement from the Company may be
         sought by the Indemnified Person on account of agreements contained
         herein) shall be brought or threatened against such Indemnified
         Person, prompt notice will be given to the Company in writing of such
         action, together with a copy of all papers served on, or received by,
         the Indemnified Person in connection with such action provided that
         failure to give such notice shall not affect the Indemnified Person's
         right under these indemnification provisions, unless, and only to the
         extent that, such failure results in the Company's forfeiture of
         substantive rights or defenses.  If such an event occurs the Company
         shall assume the defense of such action, including the employment of
         counsel and the payment of all expenses.  The Indemnified Person shall
         have the right to employ separate counsel in any such action and to
         participate in the defense thereof, but the fees and expenses of such
         counsel shall be at the expense of the Indemnified Person unless (a)
         the employment thereof has been specifically authorized by the Company
         in writing;  (b) the Company has failed to assume the defense and
         employ counsel;  or (c) the named parties, or parties threatened to be
         named, to any such action (including any impleaded parties or parties
         threatened to be impleaded) include both the Indemnified Person and
         the Company, and the Indemnified Person has been advised by such
         counsel that there may be one or more legal defenses available to the
         Indemnified Person which are different from or additional to those
         available to the Company (in which cases the Indemnified Person shall
         have the right to employ their own counsel and in such cases any
         reasonable fees and expenses of such counsel shall be paid by the
         Company).

         7.4     The obligations under this Clause 7 shall survive any
         termination of this Agreement, in whole or in part.

8.       Fees and Expenses

         8.1     The Company shall, on the Closing Date, pay to HSBC:

         (i)      for the account of the Lead Managers, a placement fee of
         three percent (3%) of the aggregate principal amount of the Placed
         Notes, which shall be allocated as between themselves, and any
         Managers of the Issue as the Lead Managers see fit;

         (ii)    for the account of HSBC, a financial advisory fee of  two
         percent (2%) of the aggregate principal amount of the Placed Notes;
         and

         (iii)   for the account of Rauscher Pierce & Clark Limited, a
         financial advisory fee of  two percent (2%) of the aggregate principal
         amount of the Placed Notes.

         Such commissions and fees shall be deducted from the Issue Price.  The
         Lead Managers and the Company acknowledge and agree that any fees
         payable to  third parties, other than the parties to the Issue
         Documents as set forth in Section 8.3(d), to be agreed in a side
         letter between the Company and the Lead Managers shall be payable out
         of the financial advisory fees set forth in subparts (ii) and (iii)
         above.

         8.2     The Company shall issue to the Lead Managers or their
         respective designees on the Closing Date warrants (the "Lead Manager
         Warrants") pursuant to Regulation S to purchase an aggregate number of
         shares of Common Stock equal in number to eight percent (8%) of the
         total





                                       14
<PAGE>   17
         number of Shares issuable upon conversion of the Notes, at an initial
         exercise price equal to U.S.$5.00, which shall be issued in the form
         of Lead Manager warrant certificates (the "Lead Manager Warrant
         Certificates"), a draft of which is in the agreed form.  Each Lead
         Manager Warrant shall entitle the holder to purchase one share at an
         initial exercise price equal to the Conversion Price of the Notes, and
         having a term of two and one half (22) years, and may be exercised as
         to all or any lesser number of shares of Common Stock covered thereby,
         commencing six (6) months after the date of issuance.

         8.3     The Company is responsible for paying and shall reimburse the
         party incurring:

         (a)     the fees and expenses of the legal, accountancy and other
         professional advisers instructed by the Company in connection with the
         creation and issue of the Notes and the preparation of the Offering
         Circular;

         (b)     the costs incurred in connection with the preparation and
         execution of this Agreement and the Issue Documents;

         (c)     the cost of setting, proofing, printing and delivering the
         Offering Circular, the Global Note and the Bearer Notes;

         (d)     the fees and expenses of the other parties to the Issue
         Documents;

         (e)     the cost of any advertising agreed between the Company, HSBC
         and RPC; and

         (f)     the costs incurred in connection with the application for the
         Notes to be listed on the Luxembourg Stock Exchange.

         provided however, that any fees or costs incurred by HSBC and/or RPC
         shall not, together with any amounts reimbursed pursuant to this
         Section 8, exceed $200,000 without the prior written consent of the
         Company.

         8.4     In addition, the Company shall reimburse HSBC and RPC for all
         legal fees and expenses and any travelling, communication, courier,
         postage and other out-of-pocket expenses incurred by them in
         connection with the management of the issue of the Notes and any
         amount due to HSBC or RPC under this sub-clause may be deducted from
         the Issue Price or paid direct by the Company to any third party to
         whom such moneys are payable; provided, however, that such expenses
         shall not exceed U.S.$200,000 without the prior written consent of the
         Company (including the due diligence visits by the Lead Managers,
         roadshow expenses (if any), listing expenses, costs associated with
         production of a research report on the Company to be issued following
         the Closing, other costs specified in Section 8.3 and post-closing
         advertisements, but excluding the fees and expenses of the Company's
         legal counsel).  Such reimbursement is not contingent upon the
         successful completion of the Placement.

         8.5     All payments in respect of the obligations of the Company
         hereunder shall be made free and clear of and without withholding or
         deduction for, any taxes, duties, assessments or governmental charges
         of whatsoever nature imposed, levied, collected, withheld or assessed
         by United States federal or state taxing authorities or any political
         subdivision or any authority thereof or therein having power to tax,
         unless such withholding or deduction is required by law.  In that
         event, the Company shall pay such additional amounts as will result in
         the receipt by the relevant





                                       15
<PAGE>   18
         Person of such amounts as would have been received by it if no such
         withholding or deduction had been required provided that such Person
         is not a U.S. Person or entity.

         8.6     The Company shall pay all stamp, registration and other taxes
         and duties (including any interest and penalties thereon or in
         connection therewith) which may be payable upon or in connection with
         the creation, sale and issue of the Notes, and the execution of this
         Agreement and the Issue Documents, and the Company shall indemnify
         each Manager against any claim, demand, action, liability, damages,
         cost, loss or expense (including, without limitation, legal fees)
         which it may incur as a result or arising out of or in relation to any
         failure to pay or delay in paying any of the same.

         9.      Closing

         9.1     Subject to this Agreement not having been terminated pursuant
         to Clause 10 and subject to Clause 9.3, the closing of the Issue shall
         take place on the Closing Date, whereupon, subject to and in
         accordance with the terms of this Agreement and the Trust Indenture:

         (a)     the Company shall deliver the Global Note (in respect of the
         number of Bearer Notes), duly executed on behalf of the Company and
         authenticated in accordance with the Trust Indenture, to a common
         depositary designated for the purpose by Euroclear and Cedel for
         credit on the Closing Date to the accounts of Euroclear and Cedel with
         such common depositary; and

         (b)     against such delivery of the Global Note referred to in Clause
         9.1 the Lead Managers shall upon receipt of moneys from each Placee
         make payment of such net proceeds received from the issue of the Notes
         (namely the Issue Price less the fees and expenses that are to be
         deducted pursuant to Clause 8) to the Segregated Account by wire
         transfer in U.S. dollars either for same day value or on the business
         day immediately thereafter together with interest at an annual rate of
         five and one-half percent (5.5%) to such account as the Company has
         designated to the Lead Managers.

         9.2     The Company and the Lead Managers may agree to postpone the
         Closing Date to another date not later than June 30, 1997, whereupon
         all references herein to the Closing Date shall be construed as being
         to that later date.

         9.3     The Lead Managers shall only be under obligation to proceed
         with the foregoing if:

         (a)     the Lead Managers receive on or before the Closing Date:

                 (i)      a legal opinion dated the Closing Date and addressed
                          to the Lead Managers and the Trustee from Haynes and
                          Boone, L.L.P in a form reasonably acceptable to the
                          Lead Managers;

                 (ii)     closing certificates dated the Closing Date,
                          addressed to the Lead Managers and signed by a duly
                          authorised signatory on behalf of the  Company in
                          substantially the agreed form;





                                       16
<PAGE>   19
                 (iii)    a closing auditors comfort letter dated the Closing
                          Date and addressed to the Managers from Arthur
                          Andersen L.L.P. in substantially the agreed form;

                 (iv)     confirmation from the Luxembourg Stock Exchange that
                          the Notes have been approved for listing on such
                          exchange subject to closing;

         (b)     the Issue Documents are executed on or before the Closing Date
         by or on behalf of all parties thereto in substantially the agreed
         form;

         (c)     there has, since the date of this Agreement, been no adverse
         change, or any development reasonably likely to involve an adverse
         change, in the condition (financial or otherwise) or general affairs
         of the Company or any Subsidiary that is material in the context of
         the offer, sale or issue of the Notes; and

         (d)     the representations and warranties by the Company in this
         Agreement are true and correct on the date of this Agreement in all
         material respects and on each date on which they are deemed to be
         repeated and would be true and correct if they were repeated on the
         Closing Date with reference to the facts and circumstances then
         subsisting.

10.      Termination

         10.1    Either of the Lead Managers may give a termination notice to
         the Company at any time prior to the Closing if:

         (a)     any representation and warranty by the Company in this
         Agreement is or proves to be untrue or incorrect in any material
         respect (in the opinion of the Lead Managers) after consultation with
         their legal counsel on the date of this Agreement or on any date on
         which it is deemed to be repeated;

         (b)     the Company fails to perform any of its obligations hereunder
         which in the opinion of the Lead Managers after consultation with
         their legal counsel is material;

         (c)     any of the conditions in Clause 9.3 is not satisfied or waived
         by the Lead Managers on the Closing Date; or

         (d)     since the date of this Agreement there has been, in the
         opinion of either of the Lead Managers (after such consultation with
         the Company as may be reasonably practicable in the circumstances),
         such a change in national or international financial, political or
         economic conditions, currency exchange rates or exchange controls on
         the U.S. or international oil and gas markets as would in its view be
         likely to prejudice materially the success of the offering and
         distribution of the Notes or dealings in the Notes in the secondary
         market.

         10.2    The Company may give a termination notice to the Lead Managers
         at any time prior to the delivery by the Company of the Global Note to
         the common depositary on the Closing Date, if any of the Lead Managers
         fails to perform any of its obligations hereunder or comply with any
         of the terms hereof which in either case is material in the opinion of
         the Company after consultation with its legal counsel.





                                       17
<PAGE>   20
         10.3    Upon the giving of a termination notice under Clause 10.1 or
         10.2 and subject to Clause

         10.4:

         (a)     the Company shall be discharged from performance of its
         obligations under Clauses 3. 1 and 7. 1;

         (b)     the Managers shall be discharged from performance of their
         respective obligations hereunder; and

         (c)     the provisions of Clauses 1, 7, 8.3, 8.4, 13 and 14 shall
         continue in full force and effect.

         10.4    A discharge pursuant to Clause 10.2 shall not affect the other
         obligations of the parties hereto and shall be without prejudice to
         accrued liabilities.

11.      Survival

         The provisions of this Agreement shall continue in full force and
         effect notwithstanding the completion of the arrangements set out
         herein for the issue of the Notes and regardless of any investigation
         by any party hereto.

12.      Time

         Any date or period specified herein may be postponed or extended by
         mutual written agreement among the parties but as regards any date or
         period originally fixed or so postponed or extended, time shall be of
         the essence.

13.      Notices

         13.1     All notices and other communications hereunder shall be made
         in writing and in English (by letter, telex or fax) and shall be sent
         as follows:

         (a)     if to the Company, to it at:

                 5605 North MacArthur Boulevard
                 Suite 400
                 Irving, Texas 75038

                 Attention:   Bruce N. Huff
                              Senior Vice President and Chief Financial Officer

                 Tel:             (972) 753 6839
                 Fax:             (972) 753 6926





                                       18
<PAGE>   21
                 With a copy
                 to:              Larry E. Cummings
                                  Vice President, Secretary and General Counsel

                 Tel:             (972) 752 6932
                 Fax:             (972) 753 6963

         (b)  if to HSBC, to it at:

                 Thames Exchange
                 10 Queen Street Place
                 London EC4R 1BL

                 Attention:       Simon Eagles
                                  Equity Capital Markets

                 Tel:             0171 336 2237
                 Fax:             0171 929 1520
                 Telex:           888866

         (c)     if to RPC, to it at:

                 56 Green Street
                 London WlY 3RH


                 Attention:       David P. Quint
                                  Managing Director

                 Tel:             0171 491 2434
                 Fax:             0171 491 9081

         13.2    Every notice or other communication sent in accordance with
         Clause 13.1 shall be effective as follows:

         (a)     if sent by letter or fax, upon receipt by the addressee; and

         (b)     if sent by telex, upon receipt by the sender of the addressee's
         answerback at the end of transmission;

         provided, that any such notice or other communication which would
         otherwise take effect after 4.00 p.m.  (Greenwich Mean Time) on any
         particular day shall not take effect until 10.00 a.m. (Greenwich Mean
         Time)  on the immediately succeeding business day in the place of the
         addressee.





                                       19
<PAGE>   22
14.      Governing Law

         This Agreement shall be governed by and construed in accordance with
         the laws of the State of New York without regard to the conflict of
         laws provisions thereof.





                                       20
<PAGE>   23
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorised representatives as of the day and year first
above written.


HARKEN ENERGY CORPORATION

By:     /s/ Bruce N. Huff            
        -------------------------------
Name:   Bruce N. Huff                
        -------------------------------
Title:  SVP and CFO                  
        -------------------------------
                                       
                                       
HSBC INVESTMENT BANK PLC               
                                       
By:     /s/ Simon Eagles             
        -------------------------------
Name:   Simon Eagles                 
        -------------------------------
Title:  Director - Equity Capital Marke
        -------------------------------
                                       
                                       
RAUSCHER PIERCE & CLARK, INC.          
                                       
By:     /s/ David P. Quint           
        -------------------------------
Name:   David P. Quint               
        -------------------------------
Title:  President                     
        -------------------------------
                                       
RAUSCHER PIERCE & CLARK LIMITED        
                                       
By:     /s/ David P. Quint           
        -------------------------------
Name:   David P. Quint               
        -------------------------------
Title:  Managing Director            
        -------------------------------





                                       21
<PAGE>   24


BANCA DEL GOTTARDO

By:     /s/ Edward Law            
        --------------------------
Name:   Edward Law                
        --------------------------
Title:  Manager                   
        --------------------------
                                  
                                  
 JEFFERIES INTERNATIONAL LIMITED  
                                  
By:     /s/ Edward Law          
        --------------------------
Name:   Edward Law              
        --------------------------
Title:  Manager                
        --------------------------
                                  
                                  
 INVESTMENTBANK AUSTRIA A.G.      
                                  
By:     /s/ Edward Law          
        --------------------------
Name:   Edward Law              
        --------------------------
Title:  Manager                
        --------------------------





                                       22
<PAGE>   25
                                  The Schedule

                              Selling Restrictions


1.       General

         1.1     Each Manager acknowledges that no action has been or will be
         taken in any jurisdiction by the Company that would permit a public
         offering of the Notes, or possession or distribution of any offering
         material in relation thereto, in any country or jurisdiction where
         action for that purpose is required.

         1.2     Each Manager undertakes to the Company that it will comply
         with all applicable laws and regulations in each country or
         jurisdiction in which it purchases, offers, sells or delivers Notes or
         has in its possession or distributes such offering material, in all
         cases at its own expense including, without limitation, in the United
         Kingdom, the provisions of the Criminal Justice Act 1993 and the Money
         Laundering Regulations (1993).

         1.3     Each Manager undertakes to the Company that it will comply
         with all U.S. laws and regulations applicable to the offer and sale of
         the Notes, including Regulation S of the Securities Act, the exemption
         from the registration requirements of the Securities Act pursuant to
         which the Notes are being offered and sold.  Notwithstanding any of
         the agreements, terms or procedures set forth in this Agreement, if
         Regulation S is amended such amendments are deemed applicable to the
         offering of the Notes, each of the Managers and the Company undertake
         to comply with Regulation S, as amended, and to negotiate in good
         faith the agreements, terms and procedures set forth in this Agreement
         if necessary to comply with Regulations S, as amended.

2.       United States

         2.1     The Notes have not been and will not be registered under the
         Securities Act and may not be offered or sold within the United States
         except pursuant to an exemption from the registration requirements of
         the Securities Act.  The Shares have not been registered under the
         Securities Act and may not be offered or sold within the United States
         unless registered under the Securities Act or in a transaction
         pursuant to an exemption from the registration requirements of the
         Securities Act.

         2.2     The offers and sales of the Notes are to be effected pursuant
         to the exemption from the registration requirements of the Securities
         Act pursuant to Regulation S thereunder.  The Company and the Managers
         have established the following procedures in connection with the
         offer, sale and resale of the Notes:

         (a)     Each offer and sale of the Notes shall be made only in an
         "offshore transaction" (as defined in Regulation S) and to investors
         who are not "U.S. persons" (as defined in Regulation S);

         (b)     no offer or sale of any of the Notes shall be made in the
         United States or to, or for the account or benefit of, any "U.S.
         person" (as defined in Regulation S);





                                       23
<PAGE>   26
         (c)     no "directed selling efforts" (as defined in Regulation S) in
         respect of the Notes shall be made in or directed toward the United
         States;

         (d)     "offering restrictions" (as defined in Regulation S) in respect
         of the Notes shall be implemented;

         (e)     each purchaser of the Notes shall be furnished with the
         Offering Circular prepared by the Company together with any amendments
         thereof and supplements thereto as shall have been prepared by the
         Company, which describe, among other things, (i) the Notes, (ii) such
         summary financial and business information concerning the Company as
         is considered appropriate; and (iii) the restrictions on resale of the
         Notes;

         (f)     no Offering Circular (or any revision or amendment thereof or
         supplement thereto) shall be delivered to any "U.S. person" (as
         defined in Regulation S);

         (g)     the Company agrees to furnish the Managers with such number of
         copies of the Offering Circular and any revision or amendment thereof
         or supplement thereto as the Managers may require in connection with
         the offer and sale of the Notes; and

         (h)     each purchaser of the Notes shall be required to confirm (i)
         by means of written certification, (ii) by acceptance of their
         subscription allotment, or (iii) by other means of confirmation
         acceptable to the Company and the Lead Managers that it is not a "U.S.
         person" (as defined in Regulation S) and that such purchaser will not
         offer or sell the Notes otherwise than in compliance with the
         Securities Act and the rules and regulations of the Securities and
         Exchange Commission thereunder.

         2.3     Each Manager hereby represents, warrants and covenants with
         the Company that the Manager, its affiliates, and any person acting on
         behalf of, or as agent of, any of the foregoing, shall, whether as
         principal or agent:

         (a)     comply with the procedures set forth in Sections 2.2 and 3
         hereof;

         (b)     offer and sell the Notes to the purchasers only in "offshore
         transactions" (as defined in Regulation S);

         (c)     not engage with respect to the Notes in any "directed selling
         efforts" (as defined in Regulation S) in or directed toward the United
         States;

         (d)     comply with all "offering restrictions" (as defined in
         Regulation S) in respect of the Notes;

         (e)     not deliver any Offering Circular or any revision or amendment
         thereof or supplement thereto to any "U.S. person" (as defined in
         Regulation S);

         (f)     not make any offers or sales of any of the Notes or any
         interest therein in the United States or to, or for the account or
         benefit of, any "U.S. person" (as defined in Regulation S);

         (g)     comply with all laws and regulations of those jurisdictions in
         which the Notes are offered or sold which are applicable to the offer
         and sale of the Notes; and





                                       24
<PAGE>   27
         (h)     on or prior to the Closing Date, send to each person who is
         acting on behalf of the Manager a written confirmation or other notice
         to the effect that such person is subject to the same restrictions on
         offers and sales that apply to the Manager.

         2.4     The Company hereby represents, warrants and covenants with the
         Managers that the Company its affiliates, and any person acting on
         behalf of, or as agent of, any of the foregoing, shall, whether as
         principal or agent:

         (a)     comply with the procedures set forth in Section 2.2 hereof;

         (b)     offer and sell the Notes to the purchasers only in "offshore
         transactions" (as defined in Regulation S);

         (c)     not engage with respect to the Notes in any "direct selling
         efforts" (as defined in Regulation S) in or directed toward the United
         States;

         (d)     comply with all "offering restrictions" (as defined in
         Regulation S) in respect of the Notes;

         (e)     not deliver any Offering Circular or any revision or amendment
         thereof or supplement thereto to any "U.S. person" (as defined in
         Regulation S);

         (f)     not make any offers or sales of any of the Notes or any
         interest therein in the United States or to, or for the account or
         benefit of, any "U.S. person" (as defined in Regulation S); and

         (g)     not make any sales of any of the Notes or any interest therein
         to any person other than the purchasers; provided, however, that
         insofar as this representation and warranty involves any participating
         broker-dealers in the offering, any affiliate of such broker-dealer or
         any officer, director, employee or agent of such broker-dealer, to the
         extent such broker-dealer is acting as Manager for the offering of the
         Notes, such representation is made by the Company solely on the basis
         of and in reliance upon the representations and warranties of such
         broker-dealer.

3.       United Kingdom

         Each Manager represents, warrants and undertakes to the Company that:

         (a)     it has not offered or sold and prior to the expiry of the
         period of six (6) months from the Closing Date will not offer or sell
         any Notes to persons in the United Kingdom, except to persons whose
         ordinary activities involve them in acquiring, holding, managing or
         disposing of investments (as principal or agent) for the purposes of
         their businesses in circumstances which have not resulted in an offer
         to the public within the meaning of the Public Offer of Securities
         Regulations 1995;

         (b)     it has complied and will comply with all applicable provisions
         of the Financial Services Act 1986 and applicable orders and
         regulations thereunder with respect to anything done by it in relation
         to the Notes in, from or otherwise involving the United Kingdom; and

         (c)     it has only issued or passed on and will only issue or pass on
         to any person in the United Kingdom any document received by it in
         connection with the issue of the Notes, if that person is





                                       25
<PAGE>   28
         of a kind described in Article 11(3) of the Financial Services Act
         1986 (Investment Advertisements) (Exemptions) Order 1996 or is a
         person to whom such document may otherwise lawfully be issued or
         passed on.





                                       26

<PAGE>   1
                                                                    EXHIBIT 10.3

THIS NOTE HAS NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") AND MAY NOT BE
OFFERED, SOLD, PLEDGED, CONVERTED OR OTHERWISE DISPOSED OF IN THE UNITED STATES
OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, ANY "U.S. PERSON" (AS DEFINED IN
REGULATION S UNDER THE SECURITIES ACT) UNLESS THE NOTE HAS BEEN REGISTERED
UNDER THE SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES OR BLUE SKY LAWS
OR EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SUCH LAWS ARE AVAILABLE.

ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE LIMITATIONS
PROVIDED IN SECTIONS 165(J) AND 1287(A) OF THE UNITED STATES INTERNAL REVENUE
CODE OF 1986, AS AMENDED.

THIS OBLIGATION IS NOT A DEPOSIT AND IS NOT INSURED BY ANY AGENCY OF THE UNITED
STATES GOVERNMENT.


                           HARKEN ENERGY CORPORATION

                     5.5% SENIOR CONVERTIBLE NOTES DUE 2002

                             TEMPORARY GLOBAL NOTE

         Harken Energy Corporation, a Delaware corporation (hereinafter, the
"Issuer," which term includes any successor corporation under the Trust
Indenture hereinafter referred to), for value received, hereby promises to pay
to bearer upon presentation and surrender of this Temporary Global Note (the
"Global Note") the principal sum of Seventy Million United States Dollars (U.S.
$70,000,000) on June 11, 2002, and, to pay interest thereon from the date
hereof, semi- annually in arrears on June 11 and December 11 in each year,
commencing December 11, 1997, at the rate of 5.5% per annum, calculated on the
basis of a 360-day year consisting of twelve 30-day months, until the principal
hereof is paid or payment thereof is duly provided for.

         This Global Note is one of a duly authorized issue of notes designated
as the 5.5% Senior Convertible Notes Due 2002 (the "Notes") of the Issuer
issued and to be issued under the Trust Indenture dated as of June 11, 1997
(herein called the "Trust Indenture"), between the Issuer and Marine Midland
Bank, as Trustee.  It is a temporary security and is exchangeable in whole or
in part without charge for definitive Notes in bearer form, with interest
coupons attached, on or after the end of the Restricted Period, as defined in
the Trust Indenture, as promptly as practicable following presentation of
election by any of the beneficial owner or owners of this Global Note.

         Until exchanged in full for definitive Notes this Global Note shall in
all respects be ratably entitled to the same benefits under, and subject to the
same Terms and Conditions of, the Trust Indenture as definitive Notes
authenticated and delivered thereunder, except that the holder of this Global
Note shall not be entitled to receive payment of principal or interest hereon,
and this Note shall not be convertible into Shares of the Issuer's Common
Stock.

         This Global Note, the definitive Notes and the Trust Indenture shall
be governed by and construed in accordance with the laws of the State of New
York.
<PAGE>   2
Global Note
Page 2


         All terms used in this Global Note which are defined in the Trust
Indenture shall have the respective meanings assigned to them in the Trust
Indenture.

         Unless the certificate of authentication hereon has been executed by
the Trustee or on behalf of the Trustee by the Authenticating Agent by manual
signature of one of its authorized signatories, this Global Note shall not be
entitled to any benefit under the Trust Indenture and shall not be valid or
obligatory for any purpose.

         IN WITNESS WHEREOF, the Issuer has caused this Global Note to be duly
executed in its corporate name by the manual or facsimile signatures of the
undersigned duly authorized officers of the Issuer.

Dated as of June 11, 1997

         HARKEN ENERGY CORPORATION



         By: /s/ LARRY E. CUMMINGS                    
            ----------------------------------------
            Larry E. Cummings, Vice President


[Corporate Seal]

ATTEST:


         By: /s/ GREGORY S. PORTER                            
            ----------------------------------------
            Gregory S. Porter, Assistant Secretary



                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This Global Note is one of the Notes referred to in the within
mentioned Trust Indenture.

                                         MIDLAND BANK PLC
                                         Authenticating Agent for Marine Midland
                                         Bank, as Trustee

                          By:  /s/ CARL BALDARY
                             --------------------------

                          Name:    Carl Baldary           
                               ------------------------

                          Title:   Transaction Manager            
                                -----------------------


<PAGE>   1

                               DRILLING CONTRACT

                                    BETWEEN

                            HARKEN DE COLOMBIA, LTD.

                                  ("OPERATOR")

                                      AND

                   PARKER DRILLING COMPANY INTERNATIONAL LTD.

                                 ("CONTRACTOR")

                                      FOR

                                    RIG 223



<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                                                                 <C>
PART I: SCOPE OF THE CONTRACT

1.       The Parties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.       The Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.       Contract Duration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
4.       Drilling Operations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         4.1     CONTRACTOR'S Standard of Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         4.2     The Rig  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         4.3     Drilling Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                 4.3A     Abandonment of Well . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                 4.3B     Completion of Well  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         4.4     Well Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         4.5     Cuttings and Cores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         4.6     Measurements and Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         4.7     Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         4.8     OPERATOR Taking Complete Control Over Drilling Operations  . . . . . . . . . . . . . . . . . . . . . . 6
5.       Personnel Assigned to the Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.       Equipment and Supplies Furnished by the Parties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.       Travel of Personnel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.       Transport of Equipment and Supplies  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

PART II: ADMINISTRATION OF THE CONTRACT

9.       Import and Export of Drilling Rig, Ancillary Equipment,
         Materials and Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10.      Responsibility as to Records, Reports, Inspections, Etc.   . . . . . . . . . . . . . . . . . . . . . . . . . . 8
         10.1    Reports and Inspections  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
         10.2    Confidentiality  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
11.      Invoicing and Paying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
         11.1    Invoice Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
         11.2    Currency and Time of Payment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
         11.3    Disputed Invoices  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
         11.4    IVA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
12.      Notices and Designation of Representatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

PART III: LIABILITIES OF THE PARTIES

13.      Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
14.      Responsibility for Loss or Damage to CONTRACTOR Items  . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
15.      Responsibility for Loss or Damage to OPERATOR Items  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
16.      Reciprocal Indemnities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
17.      Responsibility for the Condition of the Hole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
18.      Risk of Damage to or Loss of Underground Mineral Deposits  . . . . . . . . . . . . . . . . . . . . . . . . .  13
19.      Responsibility for Insurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   13-14
20.      Force Majeure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
21.      Pollution or Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
</TABLE>
<PAGE>   3
<TABLE>
<S>                                                                                                                <C>
PART IV: LAW OF THE CONTRACT

22.      Assignment of Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
23.      Exhibits as Part of Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
24.      Relationship of Parties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
25.      Governing Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
26.      Prior Agreements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
27.      Waiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
28.      Patents and Rights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
29.      CONTRACTOR's Obligation To Comply with Laws  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16

PART V: COMPENSATION TO CONTRACTOR

30.      Rates of Compensation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         30.1    Mobilization Fee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         30.2    Operating Day Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         30.3    Moving Rate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         30.4    Standby With Crews Rate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         30.5    Standby Without Crews Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         30.6    Mechanical Breakdown Rate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         30.7    Negligence Remedial Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         30.8    Force Majeure Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
         30.9    Demobilization Fee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
         30.10   Application of Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
         30.11   Early Termination Fee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19

31.      Reimbursable Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         31.1    Materials, Services and Personnel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         31.2    Oil-Based Drilling Fluid Incentives  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20

32.      Daily Rate Increases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20

33.      Signatures of the Parties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20

EXHIBITS:

         "A"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         "B"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
         "C"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
         "D"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   24-29
         "E"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   30-32

ATTACHMENT "A"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
</TABLE>
<PAGE>   4
                               DRILLING CONTRACT
                                    RIG 223

PART 1: SCOPE OF THE CONTRACT

1.       THE PARTIES

         This agreement is entered into this 22nd day of July, 1997, by and
         between HARKEN DE COLOMBIA, LTD. (HDC), a Cayman Islands corporation
         ("OPERATOR"), and PARKER DRILLING COMPANY INTERNATIONAL LTD., a Nevada
         corporation ("CONTRACTOR").

2.       THE WORK

         CONTRACTOR shall drill all wells by the rotary method (inclusive of
         downhole motor operations and directional wells) for OPERATOR to
         depths specified by OPERATOR, but not to exceed 15,000 feet unless
         with CONTRACTOR's agreement. These wells shall be at locations
         selected by OPERATOR within Operators Association Contract areas (the
         "Block(s)") located in Colombia, South America. CONTRACTOR represents
         that it possesses well-skilled employees and proper equipment as
         specified herein for performance of all its work under this Contract.
         CONTRACTOR has knowledge of the physical, health and climatic
         conditions existing in the Blocks where the drilling operations will
         be undertaken. CONTRACTOR shall perform all operations with diligence
         and skill, applying sound engineering principles and good oil field
         practices, CONTRACTOR shall conduct drilling, completion and testing
         operations on a full twenty-four hour day, seven day week basis.

3.       CONTRACT DURATION

         This Contract shall become effective upon signing by the parties and
         shall continue in effect for one year from and after the Commencement
         Date (as defined in Section 30.2 hereof). The parties contemplate that
         the operation will commence on or about November 1, 1997, however, in
         the event Operator is not ready to mobilize Contractor's rig at the
         termination of the Chevron contract, or by October 1, 1997 in the
         event Contractor does not enter into a contract with Chevron, a rate
         of US$ 4,860.00/day will be due until mobilization to Operator's first
         well site. Subject to Article 3.1, OPERATOR shall have a renewable
         option to extend this contract for a period or periods, each period
         being not less than 6 months nor more than 12 months. OPERATOR shall
         notify to CONTRACTOR in writing of its election to extend this
         Contract as soon as practicable BUT NOT LATER THAN SIXTY (60) DAYS
         BEFORE THE END OF THE INITIAL TERM or subsequent extension period term
         of the Contract. OPERATOR may terminate this contract effective any
         time after the date of spudding of the first well, subject to the
         early termination provisions herein.





                                       1
<PAGE>   5
3.1      Contract Extension - OPERATOR's election to extend this Contract as
         provided in Article 3 above is subject to OPERATOR's and CONTRACTOR's
         negotiation of mutually acceptable rates and Contract modifications
         agreeable to both parties.

3.2      Early Termination

         3.2.1   Either party may immediately terminate this Contract upon
                 written notice to the other Party, if the Rig is declared by
                 either Party as an actual, constructive, compromised or
                 arranged total loss except that compensation properly earned
                 up to the time of day of that loss shall be owed by OPERATOR
                 to CONTRACTOR.

         3.2.2   Notwithstanding anything contained herein to the contrary,
                 OPERATOR shall, at any time, have the right to terminate this
                 Contract, upon thirty (30) days written notice, even though
                 CONTRACTOR has not defaulted hereunder, and, in such event,
                 CONTRACTOR shall be entitled to compensation properly earned
                 through the end of that thirty (30) day notice period,
                 including the applicable Demobilization Fee and Early
                 Termination Fee as defined by 30.11.

         3.2.3   Notwithstanding anything herein to the contrary, CONTRACTOR
                 shall have the right to terminate this Contract, upon thirty
                 (30) days written notice stating that, in CONTRACTOR's
                 reasonable opinion, it is uneconomical for CONTRACTOR to
                 continue operations under this Contract, and certifying that
                 one of the following conditions applies:

                          3.2.3.1  OPERATOR has failed to pay CONTRACTOR
                                   undisputed amounts and such amounts remain
                                   unpaid following notice and a seven day grace
                                   period.

                          3.2.3.2  New government edict, decree, rule,
                                   regulation or law has been applied to
                                   CONTRACTOR or his entitlement under this
                                   Contract.





                                       2
<PAGE>   6
4.       DRILLING OPERATIONS

         4.1     CONTRACTOR'S STANDARD OF PERFORMANCE - CONTRACTOR warrants
                 that the operation and maintenance of Contractor's Equipment
                 will be performed safely and in good and workmanlike manner in
                 accordance with accepted international oilfield practices and
                 in compliance with all applicable laws, rules and regulations
                 in effect as of the effective date of this Contract; that
                 CONTRACTOR's equipment shall be in good working order and its
                 personnel fully trained and capable of safely operating such
                 equipment and performing services required herein for
                 OPERATOR; that CONTRACTOR regularly conducts training and
                 safety programs; that all materials, equipment, goods,
                 supplies or manufactured articles furnished by CONTRACTOR in
                 the performance of the work or services shall be of suitable
                 quality and workmanship for their intended purposes, in
                 accordance with specifications, and shall be free from
                 defects; and that CONTRACTOR will not employ any employee
                 whose employment violates applicable labor or other laws.
                 CONTRACTOR further covenants, warrants and represents that all
                 work performed by it hereunder shall be conducted in
                 accordance with accepted international safety regulations (as
                 used in the country of Colombia), environmental laws and
                 regulations, precautions and procedures in effect as of the
                 effective date and by employing the necessary protective
                 equipment and devices described in the attached inventory. Any
                 breach of this safety covenant shall be grounds for immediate
                 termination of this Contract by Operator.

         4.2     THE RIG - CONTRACTOR shall furnish its RIG 223 which is a
                 complete drilling rig as described in Exhibit "B". CONTRACTOR
                 shall operate the rig and ancillary equipment at ninety (90)
                 percent of manufacturer's rated operating specifications.
                 Contractor shall provide rig modifications (including
                 modifications to substructure) as necessary to accommodate
                 underbalanced drilling equipment, and one additional mud pump
                 independently powered and compatible with the existing
                 drilling rig equipment. The Drilling Tubulars (Drill Pipe,
                 Heavy Weight Drill Pipe, Collars, Cross-Overs, Stabilizers,
                 Subs, etc.) will be subject to Exhibit E, "Tubular Standards".
                 In special circumstances, at OPERATOR request, CONTRACTOR in
                 its sole discretion may operate the rig and ancillary
                 equipment at manufacturer's rated operating specifications.
                 CONTRACTOR shall maintain the rig and ancillary equipment in
                 good working order.





                                       3
<PAGE>   7
                 The rig will maintain a current inspection certificate for all
                 major load bearing components. The inspection will be
                 performed by a third party inspection contractor.

                 OPERATOR shall notify CONTRACTOR of the location of the
                 initial well. CONTRACTOR shall mobilize the rig, the equipment
                 described herein, and its personnel to the location of the
                 initial well and shall make all necessary preparations for
                 spudding the initial well within approximately 25 days
                 following OPERATOR's notification of the location of the
                 initial well.

         4.3     DRILLING PROGRAM - Before any drilling begins on any well,
                 OPERATOR shall deliver the drilling program to CONTRACTOR
                 which Contractor shall give notice to Operator of its'
                 receipt. Contractor shall also certify in writing to Operator
                 that "rigging-up" is satisfactorily completed. CONTRACTOR
                 shall use reasonable diligence to conduct all drilling
                 operations in conformance with OPERATOR's drilling program.
                 OPERATOR may modify the drilling program so long as any
                 modifications which materially increases CONTRACTOR's hazards
                 or costs of performance bears CONTRACTOR's approval and
                 provides for an appropriate rate increase as mutually agreed
                 by the parties. CONTRACTOR SHALL NOT BEGIN TO DISMANTLE ITS
                 RIG AND EQUIPMENT FOR DEMOBILIZATION UNTIL AUTHORIZED TO DO SO
                 BY OPERATOR IN WRITING.

                 4.3A     ABANDONMENT OF WELL: OPERATOR at any time may elect
                          to have a well abandoned. Upon notice of such
                          election, CONTRACTOR shall promptly remove from the
                          hole and lay down all recoverable casing and tubing
                          and plug and abandon the hole in accordance with the
                          program provided by OPERATOR in a manner satisfactory
                          to OPERATOR and in compliance with all government
                          rules and regulations including environmental laws
                          and permits (obtained by OPERATOR) and CONTRACTOR
                          shall also promptly remove in compliance with all
                          government rules and regulations all its equipment,
                          machinery, tools, supplies and materials furnished
                          and all its debris and refuse from the location
                          resulting from its activities under this agreement.

                 4.3B     COMPLETION OF WELL: OPERATOR may at any time elect to
                          have a well completed or recompleted, and in that
                          event, CONTRACTOR shall perform the work of
                          completing the well in accordance with the program
                          provided by OPERATOR in a manner and to the extent
                          desired by OPERATOR, including but not limited to the
                          running of liner and tubing, making permanent well
                          head connections and installing Christmas trees.





                                       4
<PAGE>   8
         4.4     WELL CONTROL - CONTRACTOR shall maintain their provided well
                 control equipment in good operating condition at all times,
                 and shall in addition make such further checks as OPERATOR
                 shall direct and shall use reasonable means to control and
                 prevent fires, blowouts and other damage, to protect the hole
                 and to protect OPERATOR equipment.

         4.5     CUTTINGS AND CORES - When requested by OPERATOR, CONTRACTOR
                 shall save and identify the cuttings and cores free from
                 contamination and place them in separate containers furnished
                 by OPERATOR. Such cuttings and cores shall be made available
                 to a representative of OPERATOR at the site.

         4.6     MEASUREMENTS AND TESTS - Routinely and in addition whenever
                 requested by OPERATOR, CONTRACTOR shall measure and record the
                 total length of all in-hole tubulars in service with a steel
                 tape.

         4.7     SAFETY PRECAUTIONS - OPERATOR and CONTRACTOR shall take
                 measures to provide safe working conditions and shall comply
                 with safety procedures in effect as of the effective date of
                 this Contract regarding the maintenance and operation of
                 Contractors Equipment, delivered in writing by OPERATOR or
                 promulgated by applicable governmental agency, ministry or
                 authority and incorporated with this contract and without
                 limiting the generality of the foregoing, shall maintain
                 proper barriers, guard rails and other safety devices to
                 lessen hazards during the performance of work under this
                 Contract. Any safety equipment required by OPERATOR and
                 provided in addition to that listed in Exhibit "B" shall be
                 for OPERATOR account.' CONTRACTOR shall not permit smoking,
                 hot work or any open flames at the wellsite (except in
                 OPERATOR designated areas). Smoking, hot work and open flames
                 will be controlled via permits issued by OPERATOR and may be
                 canceled or reinstated by OPERATOR due to site conditions.
                 CONTRACTOR shall equip the rig with vapor proof lights and
                 shall equip the drilling engines' exhaust with a water
                 injection device so as to reduce the hazard of fire.
                 CONTRACTOR shall install on each well worked on hereunder
                 blowout prevention devices of the type shown in Exhibit "B"
                 and shall operate such devices at regular intervals.
                 Contractor is aware that use of underbalanced drilling
                 techniques are expected during the term of this contract. If
                 required, CONTRACTOR shall, within the capabilities of the
                 equipment and personnel required to be furnished by CONTRACTOR
                 hereunder, take precautions to prevent the well from igniting.
                 Notwithstanding the foregoing, should CONTRACTOR determine
                 that conditions exist that present an unreasonably dangerous
                 risk of injury or loss to persons or property, it may cease
                 operations until the cause of such unsafe condition has been
                 remedied. CONTRACTOR shall report to OPERATOR as soon as
                 practicable all accidents or occurrences resulting in injuries
                 to CONTRACTOR's employees or third parties or damage to the
                 property of CONTRACTOR, OPERATOR or any third parties arising
                 out of or in the course of the operations hereunder.





                                       5
<PAGE>   9
         4.8     OPERATOR TAKING COMPLETE CONTROL OVER DRILLING OPERATIONS

                 4.8A     Should any well blow-out, ignite, or in any manner
                          get out of control, OPERATOR may assume complete
                          control and supervision of the work of bringing the
                          well under control or putting out the fire. Unless
                          and until OPERATOR so elects in writing to assume
                          such complete control, CONTRACTOR shall be in
                          complete control and supervision of the same.

                 4.8B     Should CONTRACTOR at any time fail to conduct its
                          operations in compliance with applicable laws, rules
                          and regulations, with skill and diligence, in
                          conformance with accepted oilfield practice and sound
                          engineering principles, and in accordance with the
                          terms of this Contract, then OPERATOR shall notify
                          CONTRACTOR in writing of the specific deficiency.
                          After having received such notice, CONTRACTOR shall
                          have five days in which to fulfill its contractual
                          responsibilities by taking measures to rectify the
                          deficiency. Should CONTRACTOR fail to correct the
                          deficiency, OPERATOR may assume control of the rig
                          and ancillary equipment and continue the drilling
                          operations on that well until CONTRACTOR remedied any
                          deficiencies.

                 4.8C     For all time during which OPERATOR is in control of
                          the drilling operations pursuant to Articles 4.8A or
                          4.8B. OPERATOR shall have full use of CONTRACTOR's
                          rig, equipment, machinery, facilities, material,
                          supplies and personnel at the location with
                          remuneration to CONTRACTOR at the Operating Day Rate,
                          Article 30.2, and all operations shall be conducted
                          at the sole risk of OPERATOR and CONTRACTOR's
                          indemnity obligations shall be suspended. CONTRACTOR
                          agrees to provide continuing insurance coverage for
                          the Contractor's Equipment, subject to insurers
                          approval, but OPERATOR will be solely responsible for
                          any damage not covered by insurance.

5.       PERSONNEL ASSIGNED TO THE OPERATIONS

         CONTRACTOR shall provide the personnel listed in Exhibit "C" at its
         expense, Should CONTRACTOR provide additional personnel at OPERATOR
         request for brief periods, remuneration shall be at cost plus ten
         percent (10%). At OPERATOR's written notice, specifying the
         deficiency, CONTRACTOR shall withdraw from the operations any employee
         OPERATOR reasonably requests. CONTRACTOR shall pay any costs incurred
         in withdrawing and replacing the unsuitable individual. CONTRACTOR
         shall conduct all industrial relations matters in conformance with
         applicable laws and customs.





                                       6
<PAGE>   10
6.       EQUIPMENT AND SUPPLIES FURNISHED BY THE PARTIES

         6.1     BY OPERATOR - At its expense, OPERATOR shall furnish the
                 equipment, machinery, tools, supplies, materials and services
                 listed in Exhibit "D".

         6.2     BY CONTRACTOR - At its expense, CONTRACTOR shall furnish the
                 equipment, machinery, drill strings, tools, supplies and
                 personnel as listed in Exhibits "B", "C", and "D" (subject to
                 the requirements of Exhibit E). The parties deem these items
                 to be necessary items for the full performance of CONTRACTOR
                 duties.

         6.3     INSPECTION AND USE OF OPERATOR EQUIPMENT - Before using
                 OPERATOR furnished items, CONTRACTOR representative shall
                 visually inspect same with reasonable diligence and shall
                 advise OPERATOR of any apparent defect observed. All such
                 equipment, machinery, tools, and materials in CONTRACTOR's
                 possession shall remain OPERATOR's property and shall be
                 returned to OPERATOR at the end of operations in the same good
                 state of repair and operating conditions as when received,
                 subject to reasonable deterioration due to use. OPERATOR shall
                 not be entitled to any compensation for normal wear and tear
                 resulting from CONTRACTOR's use of such items. Liability for
                 damage to OPERATOR equipment is subject to Clause 15.

7.       TRAVEL OF PERSONNEL

         CONTRACTOR shall mobilize its personnel to the initial wellsite for
         the beginning of operations at no extra cost to OPERATOR, other than
         the mobilization fee. CONTRACTOR shall furnish transportation to each
         wellsite for all of CONTRACTOR's personnel in connection with initial
         personnel mobilization, crew changes and final personnel
         demobilization. CONTRACTOR shall demobilize its personnel from each
         wellsite at the end of operations at no extra cost to OPERATOR, other
         than the demobilization fee.

8.       TRANSPORT OF EQUIPMENT AND SUPPLIES

         CONTRACTOR shall prepare its rig and equipment and supplies for
         mobilization at the beginning of operations as consideration for
         OPERATOR's payment of the lump sum Mobilization Fee in Exhibit A. The
         same Mobilization Fee will also include in total the transportation of
         CONTRACTOR's rig and equipment to OPERATOR's wellsite, rigged up ready
         to spud the well to be drilled hereunder. The rig shall be ready to
         commence operations when CONTRACTOR has tested all necessary equipment
         and is ready to run in the hole with the initial tools. In the event
         OPERATOR is not ready to commence operations once CONTRACTOR is rigged
         up and ready, the Standby with Crews Rate provided in Article 30.5
         shall commence and continue from day to day





                                       7
<PAGE>   11
         thereafter until such time as the OPERATOR has authorized the
         CONTRACTOR to commence drilling operations. The Moving Rate shall apply
         during all time after the rig is released from one drilling location
         to move and rig up on another location. During demobilization, the
         Demobilization Fee in Exhibit A will apply while CONTRACTOR'S
         equipment is being moved from OPERATOR's wellsite to CONTRACTOR's
         yard. CONTRACTOR shall furnish transportation for CONTRACTOR's
         operating supplies and materials from point of origin to the wellsite.
         OPERATOR shall furnish transportation for OPERATOR's operating
         supplies and materials to each wellsite and for Contractor's rig and
         equipment to the second and subsequent wellsites.

PART II: ADMINISTRATION OF THE CONTRACT

9.       IMPORT AND EXPORT OF DRILLING RIG, ANCILLARY EQUIPMENT, MATERIALS AND
         SUPPLIES

         CONTRACTOR's drilling rig, Rig 223, has been completely imported into
         Colombia and includes at least all of the equipment listed in Exhibit
         "B" and CONTRACTOR shall assume all fees, duties and taxes in
         connection therewith.  OPERATOR shall pay all import and export
         expense, including without limitation, fees, duties, taxes, port
         charges, storage charges and documentary taxes for other equipment
         required by OPERATOR not included in Exhibit "B". CONTRACTOR's
         obligation shall be limited to arranging for the transporting,
         importing and clearing of spare parts and supplies for CONTRACTOR's
         equipment to support its operations under this Contract.

         All costs incident to the transport, importation/exportation, and
         clearing of equipment, materials and supplies, which OPERATOR requests
         CONTRACTOR to provide, will be for OPERATOR account. Special
         amortized equipment such as the top drive unit, drilling tubulars and
         third mud pump, requested by operator, is the responsibility of
         Contractor

10.      RESPONSIBILITY AS TO RECORDS, REPORTS, INSPECTIONS, ETC.

         10.1    REPORTS AND INSPECTIONS - CONTRACTOR shall at all times permit
                 OPERATOR and its authorized employees and representatives to
                 inspect all work performed hereunder and to witness and check
                 all measurements and tests made in connection with said work.
                 CONTRACTOR shall keep an authentic and accurate history and
                 log of said wells, including all measurements required for
                 fishing operations with a record of all downhole equipment
                 which shall be open at all reasonable times to inspection by
                 OPERATOR and its authorized employees and representatives.
                 CONTRACTOR shall furnish each of OPERATOR's designated
                 representatives (pursuant to the Notice provision in Section
                 13) with a copy of the daily written I.A.D.C. drilling report
                 showing depths and work performed during the preceding
                 twenty-four (24) hours and any other information relative to
                 said well requested by OPERATOR.





                                       8
<PAGE>   12
         10.2    CONFIDENTIALITY - Recognizing the confidential nature of the
                 work, CONTRACTOR shall not, without OPERATOR's prior written
                 consent, allow any third person access to the well, nor give
                 out to any third person any information concerning the well,
                 or give out to third persons, nor permit any third person to
                 examine, any samples from the well. Upon completion of the
                 work on the well, the original history and log book, as well
                 as any copies and all other data, records and reports (except
                 one copy of the daily drilling report) of any nature
                 pertaining to CONTRACTOR's operations, shall be delivered to
                 OPERATOR, it being understood that neither CONTRACTOR nor any
                 of its employees shall retain any records or data relative to
                 any well which has reference to geologic information. This
                 ability to maintain such confidentiality shall extend beyond
                 any termination of this contract for an additional period of
                 two years beyond the remaining term of that specific Harken de
                 Colombia, Ltd. Association Contract.

11.      INVOICING AND PAYING

         11.1    INVOICE PRESENTATION - CONTRACTOR shall prepare invoices at
                 the end of each calendar month and after the rig is released
                 from each well and after each rig move. The invoices shall be
                 stated in U.S.  Dollars. CONTRACTOR shall deliver the invoices
                 to OPERATOR's representative in Bogota, Colombia, with copy to
                 its Houston, Texas, office.

         11.2    CURRENCY AND TIME OF PAYMENT - OPERATOR shall pay invoices in
                 U.S. Dollars, provided that CONTRACTOR may request payment of
                 a portion of the invoices in local currency by so specifying
                 at the time of invoice presentation. The exchange rate for
                 local currency payments shall be the Tasa Representativa del
                 Mercado (TRM) effective on date of invoice. OPERATOR shall pay
                 CONTRACTOR the approved amount of invoices within thirty (30)
                 days of receipt of the invoices. OPERATOR shall deliver local
                 currency payments to CONTRACTOR's office in Colombia. If
                 OPERATOR fails to pay the undisputed portion of any invoice
                 within thirty days of receipt, interest shall accrue from the
                 thirty-first day at the prime rate in effect from time to time
                 at Citibank, plus two percent (2%) until payment is received,
                 but the rate of interest shall not exceed the maximum rate
                 permitted by applicable law.

         11.3    DISPUTED INVOICES - If OPERATOR disputes an item invoiced,
                 OPERATOR shall notify CONTRACTOR in writing of the item
                 disputed, specifying the reason and payment of the disputed
                 item shall be withheld until settlement of the dispute, but
                 PAYMENT SHALL BE MADE OF ANY UNDISPUTED PORTION. Payment of
                 any invoice shall not prejudice the right of OPERATOR to
                 question the correctness of any such invoice, provided that
                 within twenty-four (24) months of the date of any such invoice
                 OPERATOR shall make objection to any item or items thereof by
                 delivering CONTRACTOR written notice specifying the reasons
                 for its objection. Should OPERATOR within such a twenty-four
                 (24) month





                                       9
<PAGE>   13
                 period so notify CONTRACTOR, adjustments shall be made between
                 the parties as the correctness of such item shall be
                 determined. Any invoice not objected to by OPERATOR within
                 such twenty-four month period shall be deemed final and not
                 subject to review. OPERATOR upon written notice to CONTRACTOR,
                 within the twenty-four (24) month period an invoice is
                 received shall have the right to audit CONTRACTOR's accounts
                 and records relating to operations hereunder.

         11.4    IVA - For purposes of invoicing IVA tax applicable to this
                 construction contract, according to Article 3 of Decree 1372
                 of August 20, 1992, the Contractor deems his service included
                 to be 10% of the value of this Contract.

12.      NOTICES AND DESIGNATION OF REPRESENTATIVES

         All notices given by OPERATOR to CONTRACTOR shall be sent by
         registered mail and telex or delivered to:

         If to OPERATOR:           HARKEN DE COLOMBIA, LTD.         
                                   Carrera 6, No.115-65 Oficina 514F
                                   Santafe de Bogota, Colombia      
                                   Attn: Alvaro Puerta              
                                   Ph: 57-1-214-3444                
                                   Fax: 57-7-619-2676               

         with copy to:             HARKEN INTERNATIONAL, LTD.
                                   2929 Briarpark, Suite 440 
                                   Houston, TX               
                                   Attn: Stephen C. Voss     
                                   Ph: 713-789-9595          
                                   Fax: 713-789-9701         

         If to CONTRACTOR:         PARKER DRILLING CO. INTERNATIONAL, LTD.
                                   Carrera 62 No.16-92                    
                                   Santafe de Bogota, Colombia            
                                   Attn: Mr. Greg Helmen                  
                                   Ph: 011-57-1-419-1767                  
                                   Fax: 011-57-1-261-2725                 

         with copy to:             PARKER DRILLING COMPANY
                                   8 East Third Street    
                                   Tulsa, Oklahoma 74103  
                                   Attn: Donald L. Goodson
                                   Ph: 918-631-1216       
                                   Fax: 918-631-1391      




                                       10
<PAGE>   14
PART III: LIABILITIES OF THE PARTIES

13.      DEFINITIONS

         As used in this contract, "OPERATOR's personnel" shall mean the
         employees, agents, personnel, invitees, etc. of OPERATOR and its
         contractors (excluding CONTRACTOR).

         "CONTRACTOR's personnel" shall mean the employees, agents, personnel,
         invitees, etc. of CONTRACTOR and its subcontractors.

14.      RESPONSIBILITY FOR LOSS OR DAMAGE TO CONTRACTOR ITEMS

         CONTRACTOR shall assume the entire risk of and be solely responsible
         for damage to or destruction or loss (by any means including blowout
         and fire) of equipment, machinery, tools, (including but not limited
         to CONTRACTOR's drill pipe, drill collars, subs, choke and kill lines,
         flexible hoses, hydraulic hoses supplies and materials furnished by
         CONTRACTOR in connection with the operations hereunder), except for
         losses or damages to equipment resulting from the following: (1) all
         occurrences when OPERATOR is in control of operations per Article 4.8;
         (2) loss in any transportation furnished by or for account of
         OPERATOR, (3) loss of or damage to equipment in the hole and (4) the
         sole or gross negligence or willful misconduct of OPERATOR's
         personnel. CONTRACTOR shall be responsible for equipment losses and
         damages arising under (3) above resulting from the sole or gross
         negligence or willful misconduct by CONTRACTOR's personnel.

         Reimbursement for equipment damaged in the hole, more than normal wear
         and tear, will be at actual cost of repair or replacement cost,
         including transportation to site, whichever is less. Replacement cost
         shall be based on the attached schedule of downhole tools. OPERATOR
         shall have the option to replace lost or damaged equipment in-kind;
         provided said replacement equipment is of a quality and condition
         acceptable to CONTRACTOR.





                                       11
<PAGE>   15
         Reimbursement for loss or damage to CONTRACTOR's equipment, (1) when
         OPERATOR is in control of operations per Article 4.8; or (2) during
         transportation furnished by or for the account of OPERATOR; or (3) as
         a result of the sole or gross negligence of willful misconduct of
         OPERATOR'S personnel, will be at replacement cost on location without
         any deduction for depreciation; provided that OPERATOR's liability
         hereunder shall be reduced by the proceeds of insurance, if any,
         received by CONTRACTOR.

15.      RESPONSIBILITY FOR LOSS OR DAMAGE TO OPERATOR ITEMS

         OPERATOR shall assume liability at all times for damage to or loss or
         destruction of OPERATOR furnished items regardless of how, when or
         where such damage, loss or destruction occurs and CONTRACTOR shall be
         under no liability to reimburse OPERATOR for such damage, loss or
         destruction except in the case where such damage, loss or destruction
         results from the sole or gross negligence or willful misconduct by
         CONTRACTOR's personnel.

16.      RECIPROCAL INDEMNITIES

         (A)     CONTRACTOR agrees to indemnify and hold harmless OPERATOR from
                 and against any and all claims, costs, liabilities, or
                 expenses for death of, or injury to CONTRACTOR's personnel or
                 loss of or damage to property of CONTRACTOR's personnel,
                 except such death, injury, property loss or property damage as
                 may result from the sole or gross negligence or willful
                 misconduct of OPERATOR's personnel.

         (B      OPERATOR agrees to indemnify and hold harmless CONTRACTOR from
                 and against any and all claims, costs, liabilities, or
                 expenses for death of, or injury to OPERATOR's personnel or
                 loss of or damage to property of OPERATOR's personnel, except
                 such death, injury, property loss or property damage as may
                 result from the sole or gross negligence or willful
                 misconduct of CONTRACTOR's personnel. Irrespective of the
                 insurance coverage provided by CONTRACTOR, OPERATOR's status
                 as an additional insured shall not be applicable except to the
                 extent CONTRACTOR has specifically assumed liability for such
                 loss or damage under this Contract.

         (C)     Neither party shall be liable to the other for special,
                 indirect or consequential damages resulting from or arising
                 out of this Contract, including without limitation, loss of
                 profit or business interruptions, however caused.





                                       12
<PAGE>   16
         (D)     For the purposes of the indemnities OPERATOR's personnel shall
                 be deemed to include its other contractors and CONTRACTOR's
                 personnel shall be deemed to include its subcontractors.

17.      RESPONSIBILITY FOR THE CONDITION OF THE HOLE

         OPERATOR shall be responsible for the condition of the hole and shall
         defend, indemnify and hold CONTRACTOR harmless from and against any
         claims arising from damage to or loss of the hole resulting from any
         of the hazards of drilling or completion operations, including the
         cost of regaining control of the hole except if such loss was due to
         the sole or gross negligence or willful misconduct of CONTRACTOR or
         its personnel. If the hole is lost due to the sole or gross negligence
         or willful misconduct of CONTRACTOR or its personnel, CONTRACTOR shall
         redrill the hole or drill a new hole, to the depth at which the hole
         was lost, at the negligence remedial rate, as OPERATOR's sole and
         exclusive remedy. During any such period of remedial drilling, the
         parties shall continue their respective responsibilities under this
         Contract, including without limitation, those responsibilities
         concerning furnishing of supplies and materials.

18.      RISK OF DAMAGE TO OR LOSS OF UNDER-GROUND MINERAL DEPOSITS

         OPERATOR assumes the entire risk of damage to or loss or destruction
         of underground mineral deposits, reservoirs, or pools, and from any
         loss of oil and gas resulting from operations under this Contract if
         at the time of the act or omission causing such damage, loss or
         destruction, the oil or gas had not been reduced to physical
         possession above the surface of the earth. OPERATOR shall hold
         CONTRACTOR harmless against any such damage to the mineral deposits,
         reservoirs, or pools, and from any loss of oil and gas resulting from
         operations under this Contract regardless of the cause of such loss or
         damage, including the negligence, sole, gross or otherwise of any
         party, if. at the time of the act or omission causing such damage,
         loss or destruction, the oil or gas had not been reduced to physical
         possession above the surface of the earth.

19.      RESPONSIBILITY FOR INSURANCE

         CONTRACTOR shall at all times during the term of this agreement
         purchase or provide insurance coverage in amounts no less than the
         amounts provided in this Article 19. The insurance companies will be
         reasonably acceptable to OPERATOR and CONTRACTOR shall provide
         OPERATOR certificates evidencing the coverage. CONTRACTOR agrees that
         all policies required shall include an endorsement waiving the rights
         of subrogation against OPERATOR for liabilities specifically assumed
         by CONTRACTOR under this Contract. OPERATOR will be named an
         additional insured under CONTRACTOR's General Liability and
         Automobile Liability policies to the extent of the liabilities
         specifically assumed by CONTRACTOR under the terms of this Contract.
         Such policies shall provide for thirty (30) days notice





                                       13
<PAGE>   17
         in writing to OPERATOR in the event of cancellation or material change
         in coverage. In the event subcontractors are used, CONTRACTOR will
         require such subcontractors to maintain Worker's Compensation and
         General Liability Insurance commensurate with the work being
         subcontracted. Any claim against Workers Compensation or Liability
         Insurance shall be defended or discharged by CONTRACTOR. The insurance
         coverage's are:

         Worker's Compensation Insurance sufficient to comply with the laws of
         the State of Texas to cover expatriate employees. CONTRACTOR shall
         further comply with the laws of Colombia related to employment and
         labor including any Worker's Compensation and Worker's Insurance or
         other similar requirements regarding National employees, and shall
         carry Employers Liability Insurance with limits of U.S. $300,000 for
         injury to or death of each person and U.S. $1,000,000 for injuries to
         or death of more than one person by reason of each occurrence;

         Comprehensive General Liability Insurance with limits of U.S. $300,000
         for injury to or death of one person, U.S. $1,000,000 for injury to or
         death of more than one person by reason of each occurrence and
         property damage coverage for loss of or damage to the property of
         third persons in the amount of U.S. $1,000,000 for any occurrence;

         Comprehensive Automobile Liability Insurance with limits of U.S.
         $250,000 per person with a limit of U.S. $1,000,000 each occurrence
         and U.S. $1,000,000 property damage each occurrence;

         Rig Casualty Insurance sufficient to protect CONTRACTOR against loss
         or damage to the drilling equipment specified in Exhibit "B" to be
         supplied by CONTRACTOR. Such Rig Casualty Insurance shall provide for
         a waiver of subrogation as to OPERATOR, limited to the extent of the
         specific liabilities assumed by CONTRACTOR in this Contract.

         Excess Liabilities coverage in an amount of U.S. $5,000,000.

         CONTRACTOR shall obtain any other coverage required by the laws of the
         Colombia.

20.      FORCE MAJEURE

         Except for obligations for the payment of money, neither party shall
         be liable for loss or damage arising out of any delay or failure of
         performance caused by circumstances beyond its' control, including but
         not limited to earthquake, flood, hurricane, blowout, cratering, acts
         of God or public enemies, war, national emergency, invasion,
         insurrection, riots, strikes, picketing, boycott, interruption of
         services rendered by any public utility or interference by any
         governmental agency or official (whether legal or illegal). Nor shall
         any delay or failure of performance due to any of said causes be
         deemed a breach of or a default in the performance of this Contract.
         The party prevented from performing for any





                                       14
<PAGE>   18
         such cause shall promptly notify the other and shall do all things
         reasonably possible to remove such cause and shall resume performance
         hereunder as soon as such cause is removed. Should any act of force
         majeure causing the suspension of operations hereunder continue for a
         period of thirty (30) days or more, OPERATOR shall have the right to
         terminate this agreement by giving CONTRACTOR five (5) days prior
         notice of its intention to do so, subject to payment in accordance
         with Articles 30.4 and 30.3 and 30.11.

21.      POLLUTION OR CONTAMINATION

         OPERATOR shall assume all liability for and defend, indemnify, hold
         CONTRACTOR harmless from any loss or damage arising from pollution or
         contamination except if caused by Contractor's gross negligence or
         willful misconduct, including but not limited to that which may result
         from (1) blowout, fire, cratering, seepage, or any other uncontrolled
         flow of oil, gas or water during the conduct of operations hereunder
         and (2) the use or disposition of oil emulsion, oil base or chemically
         treated drilling fluids, well cuttings, and cavings, lost circulation
         and fishing operations, recovery of materials and fluids, as well as
         the furnishing of transportation for and disposition of such materials
         when required. CONTRACTOR shall assume liability for surface spills of
         pipe dope, greases, solvents, or other similar surface materials under
         its control.

PART IV: LAW OF THE CONTRACT

22.      ASSIGNMENT OF CONTRACT

         Neither party may assign this Contract or any of its rights under this
         Contract nor delegate any of its obligations other than to a wholly
         owned subsidiary, affiliate corporation or joint venturer, without the
         prior written consent of the other party, which shall not be
         unreasonably withheld. The parties agree to respond to such notice
         within fifteen (15) days.

23.      EXHIBITS AS PART OF CONTRACT

         Exhibits "A", "B", "C", "D" and "E" (including Attachment "A") are
         attached hereto and shall be considered to be part of this agreement
         to the same extent as if incorporated in the body hereof. For better
         identification, such exhibits shall be initialed by both parties.

24.      RELATIONSHIP OF PARTIES

         The work shall be performed by CONTRACTOR as an independent contractor
         and CONTRACTOR's employees shall at all times be under the direction
         and control of CONTRACTOR. CONTRACTOR will receive directions from
         OPERATOR as to the end results to be accomplished, and CONTRACTOR
         shall be responsible for directing its employees as to the manner and
         means of accomplishing the work to be performed by CONTRACTOR pursuant
         to good





                                       15
<PAGE>   19
         and workman's practices. Compliance by CONTRACTOR, or its employees,
         with engineering directions, safety practices, maintenance
         instructions or change of orders issued by OPERATOR shall not affect
         CONTRACTOR's status as an independent contractor and shall not relieve
         CONTRACTOR of the obligations assumed by him under this Contract.

25.      GOVERNING LAW

         This agreement and interpretation hereof shall be governed by the laws
         of the State of Texas, exclusive of the choice of law rules thereof,
         as if therein to be wholly performed.

26.      PRIOR AGREEMENTS

         No prior stipulations, agreements or understanding by the parties or
         any of their representatives shall be valid or enforceable unless
         embodied in this Contract or covered by its provisions or added by
         separate letter executed by both parties or their agents.

27.      WAIVER

         The waiver of or failure to require the performance of any covenant or
         obligation contained in this Contract shall not be deemed to
         constitute a waiver of a similar later breach.

28.      PATENTS AND RIGHTS

         OPERATOR shall not be liable or responsible for any damages or claims
         of any kind arising out of real or alleged patent infringements,
         design trademark or name or other protected rights which arise out of
         or are caused by or are attributed, directly or indirectly, to any
         work carried out and/or any equipment used by CONTRACTOR or its
         subcontractors and CONTRACTOR shall indemnify, save and hold harmless
         OPERATOR, its officers, employees, agents and servants from and
         against such damages and claims. CONTRACTOR shall not be liable or
         responsible for any damages or claims of any kind arising out of real
         and alleged patent infringements, design trademark or name or other
         protected rights which arise out of or are caused by or are attributed
         to, directly or indirectly, any work carried out and/or any equipment,
         except the equipment of CONTRACTOR and its subcontractors, used by
         OPERATOR and OPERATOR shall indemnify, save and hold harmless
         CONTRACTOR, its officers, employees, agents and servants from and
         against such damages and claims.

29.      CONTRACTOR'S OBLIGATION TO COMPLY WITH LAWS

         CONTRACTOR agrees to comply with all permits, concessions and
         clearances (and with all applicable laws and regulations in effect on
         the effective date of this Contract) that govern the performance of
         CONTRACTOR's obligations





                                       16
<PAGE>   20
         under this Contract by CONTRACTOR. CONTRACTOR shall indemnify OPERATOR
         against any and all liabilities, damages, claims, fines, penalties and
         expense of whatsoever nature resulting from CONTRACTOR's failure to
         comply with this provision. CONTRACTOR represents that it is qualified
         to do business and is established on a proper legal basis to perform
         services for OPERATOR in Colombia.

PART V: COMPENSATION TO CONTRACTOR

         RATES OF COMPENSATION - Except as specified to the contrary herein,
         the rates specified under this Clause 30 shall not accrue until the
         Commencement Date.

         CONTRACTOR shall perform drilling operations and fulfill its
         obligations according to this Contract. OPERATOR shall pay CONTRACTOR
         as full compensation for the work performed and material, equipment
         and supplies furnished as follows:

         30.1    Mobilization Fee - Initial wellsite will be determined prior
                 to Mobilization Fee being quoted by CONTRACTOR and approved by
                 OPERATOR. OPERATOR shall pay CONTRACTOR in a lump sum the
                 amount set forth as Exhibit "A", Item 1, for CONTRACTOR
                 mobilizing its personnel which are located at Bogota and its
                 rig and ancillary equipment and materials and supplies from
                 last wellsite to Operator's wellsite. OPERATOR shall pay this
                 amount within thirty days of receiving CONTRACTOR's invoice
                 bearing the date of departure of the rig from last wellsite.

         30.2    Operating Day Rate - This rate is set forth as Exhibit "A",
                 Item 2. Unless superseded by another rate, beginning on the
                 day CONTRACTOR is ready to spud the first well (the
                 "Commencement Date") and continuing all the time until the rig
                 is released in preparation for rigging down to move and
                 including but not limited to time spent reaming, coring,
                 fishing, drill stem testing, picking up drill pipe, tripping,
                 circulating and conditioning mud, running and cementing
                 casing, waiting on cement, logging, waiting on orders,
                 nippling up, running tubing, testing and completing a well or
                 swabbing, OPERATOR shall pay CONTRACTOR the Operating Day
                 Rate.

         30.3    Moving Rate - This rate is set forth as Exhibit "A", Item 3.
                 This rate shall apply during rigging up operations, during
                 dismantling operations and for all time spent moving the rig
                 from one wellsite to another wellsite. Operator and Contractor
                 shall, within 24 hours or earlier of rig release from
                 Operator's wellsite, mutually agree to a single lump sum
                 mobilization fee to transport all of Contractor's rig and
                 equipment to Operator's next wellsite. If mutual agreement on 
                 a lump sum fee





                                       17
<PAGE>   21
                 cannot be reached then Contractor's equipment will be moved 
                 using Operator furnished transportation and Contractor shall 
                 invoice Operator for all mobilization days at the Moving Rate
                 specified in Exhibit "A".

         30.4    Standby With Crews Rate - This rate is set forth in Exhibit
                 "A", Item 4. Except for the situation set forth in Article
                 30.6, whenever the rig is shut down at OPERATOR's request, the
                 rig shall be considered to be standing by with crews. The
                 Operating Day Rate shall be payable for the first 24 hours
                 after Operator's request and thereafter the Standby With Crews
                 Rate shall be payable until the standby with crews status
                 ends.

         30.5    Standby Without Crews Rate - This rate is set forth as Exhibit
                 "A", Item 5. Whenever in OPERATOR'S sole judgment the
                 estimated period of OPERATOR requested rig shut down is long
                 enough to warrant demobilization of personnel, cessation of
                 camp operations or other cost reductions, OPERATOR may place
                 the rig on the Standby Without Crews Rate upon, five days
                 written notice to CONTRACTOR. OPERATOR shall reimburse
                 CONTRACTOR in demobilizing CONTRACTOR's personnel from point
                 of origin and remobilizing them in connection with a period of
                 Standby Without Crews status at cost plus ten percent (10%).
                 Further reductions in this rate can be made by reducing the
                 drilling staff at the request of Operator to watchmen levels
                 only.

         30.6    Mechanical Breakdown Rate - This rate is set forth at Exhibit
                 "A", Item 6 and is calculated as follows: if there is a work
                 stoppage due to mechanical failure not primarily caused by the
                 negligence of CONTRACTOR's personnel, payment shall be at the
                 full Operating Day Rate for any such stoppage up to
                 twenty-four hours per occurrence. Thereafter, CONTRACTOR shall
                 be entitled to receive a rate equal to sixty-five percent
                 (65%) of the Operating Day Rate until the breakdown is
                 repaired.

         30.7    Negligence Remedial Rate

                 30.7.1   This rate is set forth at Exhibit "A", Item 7 and is
                          calculated as follows: If there is a work stoppage as
                          a primary result of the negligence of CONTRACTOR's
                          personnel, OPERATOR shall pay the Operating Day Rate
                          for any such stoppage up to twenty-four hours.
                          Thereafter, the rate shall be eighty percent (80%) of
                          the Operating Day Rate until the breakdown is
                          repaired or for ten days whichever first occurs. If a
                          breakdown under this Article 30.7.1 continues for
                          more than ten days, CONTRACTOR shall earn zero rate
                          beginning with the eleventh day until the breakdown
                          is repaired.





                                       18
<PAGE>   22
                 30.7.2   Time Negligence Remedial Rate shall also be payable
                          for all time, without limitation, spent performing
                          remedial operations as provided in Article 17.

         30.8    Force Majeure Rate - This rate is set forth at Exhibit "A",
                 Item 8 and is calculated as sixty-five percent (65%) of the
                 Operating Day Rate. The Force Majeure Rate shall be payable
                 whenever a condition of force majeure exists as described in
                 Article 20.

         30.9    Demobilization Fee - OPERATOR shall pay CONTRACTOR in a lump
                 sum the amount set forth as Exhibit "A", Item 10 as a
                 demobilization fee within thirty days of receiving
                 CONTRACTOR's invoice bearing the date the rig, ancillary
                 equipment and supplies departs OPERATOR's last wellsite. If
                 Contractor has received another contract for this rig, to
                 commence with release of this rig from Operators last well,
                 then the demobilization will be reduced by the following:

<TABLE>
                          <S>          <C>                    <C>
                          Well         800 kms distant:       0 discount
                          Well         600 kms distant:       35% discount
                          Well         400 kms distant:       70% discount
                          Well         200 kms distant:       100% discount
</TABLE>

         30.10   Application of Rates - The rates set forth in this Article 30
                 apply for a full 24-hour day and shall be prorated when two or
                 more rates apply to parts of a single 24-hour day. Only one
                 rate or fee shall be payable at any one time. During rigging
                 up, dismantling and well to well movement operations, the full
                 daily rate shall be payable even if operations are conducted
                 only during the daylight portion of the day.

         30.11   Early Termination Fee - In the event this Contract is
                 terminated by OPERATOR prior to the one year initial term,
                 CONTRACTOR will receive, in addition to the compensation
                 provided in Section 3.2.2, the Early Termination Fee. The
                 number of days used in calculating the Early Termination Fee
                 shall be the lesser of (1) the number of days remaining in the
                 initial term of this Contract, or (2) 90 days. (The actual
                 number of days constituting this period in any situation shall
                 be referred to as the "Termination Period.")

                 In the event the OPERATOR elects early termination and the
                 CONTRACTOR acquires other work for the Rig during the
                 Termination Period, then OPERATOR shall be entitled to receive
                 a refund from CONTRACTOR of the daily Standby Without Crew
                 Rate for each day the Rig earns a dayrate under contract to a
                 third party.

                 The Early Termination Fee should not be applicable to any
                 subsequent period(s) to which the Contract has been extended
                 beyond the Initial Term of this Contract.





                                       19
<PAGE>   23
31.      REIMBURSABLE ITEMS

         31.1    Materials, Services and Personnel-If OPERATOR requests
                 CONTRACTOR to provide materials, services or personnel in
                 addition to those specified in this Contract. OPERATOR shall
                 reimburse CONTRACTOR for such materials and services as are
                 actually furnished at CONTRACTOR cost plus ten percent (10%).
                 If any additional personnel are furnished by CONTRACTOR on a
                 short term basis, OPERATOR shall reimburse CONTRACTOR at cost
                 plus ten percent (10%).

         31.2    Oil-Based Drilling Fluid Incentives - For each day of the
                 Contract term during which oil base drilling fluid is in use,
                 OPERATOR shall reimburse CONTRACTOR at the rate of U.S. $10.00
                 per person for incentive payments to those expatriate
                 personnel and U.S.$4.00 per person for incentive payments to
                 those national personnel assigned to the operation who are
                 actually on a rig tour on a day when oil base drilling fluid
                 is in use. CONTRACTOR shall invoice OPERATOR separately for
                 this reimbursement each month and shall support the invoice
                 with a schedule of incentive payments made.

32.      DAILY RATE INCREASES

         The rates established in the Contract are based on current costs as of
         the date of this contract. If after the execution of this agreement,
         CONTRACTOR shall demonstrate to the reasonable satisfaction of
         OPERATOR that an increase has occurred in any component of
         CONTRACTOR's costs that increases said costs in excess of 5%,
         including increases in costs as a result of new laws or new
         interpretations of existing laws, the daily rate shall be
         appropriately adjusted in an amount equal to such cost changes. Daily
         Rate increases under this Clause shall not exceed 10% of the Operating
         Day Rate during any 12 month period.

33.      SIGNATURES OF THE PARTIES

         IN WITNESS OF THE COVENANTS AND CONDITIONS OF THE FOREGOING
         THIRTY-THREE ARTICLES OF THIS CONTRACT AND THE EXHIBITS HERETO, the
         parties execute two (2) copies of this Contract, one of which shall
         be retained by OPERATOR and one of which shall be retained by
         CONTRACTOR.

         OPERATOR                       CONTRACTOR

HARKEN COLOMBIA, LTD.                   PARKER DRILLING.COMPANY
                                        INTERNATIONAL LTD.

By: /s/ STEVEN C. VOSS                  By: /s/ DONALD L. GOODSON
   ------------------------------          --------------------------------
Title: Director                         Title: Vice President
      ---------------------------             -----------------------------
Date: July 22, 1997                     Date: July 21, 1997
     ----------------------------            ------------------------------




                                       20
<PAGE>   24

                                   EXHIBIT A
                    PARKER DRILLING COMPANY, INC. - RIG 223
                                RATES OF PAYMENT
                            HARKEN DE COLOMBIA, LTD.
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
ITEM                           DESCRIPTION                                     FEE OR RATE IN U.S. $
- ----------------------------------------------------------------------------------------------------
<S>      <C>                                                                         <C>
1        Mobilization Fee                                                            350,000.00
- ----------------------------------------------------------------------------------------------------
2.       Operating Day Rate with three mud pumps available.                           13,500.00
- ----------------------------------------------------------------------------------------------------
3.       Moving Rate                                                                  12,150.00
- ----------------------------------------------------------------------------------------------------
4.       Standby with Crews Rate
                 After 24 hours                                                       12,150.00
- ----------------------------------------------------------------------------------------------------
5.       Standby without Crews Rate                                                    8,775.00
- ----------------------------------------------------------------------------------------------------
6.       Mechanical Breakdown Rate
                 1st 24 hrs. per occurrence                                           13,500.00
                 After 24 hrs. per occurrence                                          8,775.00
- ----------------------------------------------------------------------------------------------------
7.       Negligence Remedial Rate
                 1st 24 hrs.                                                          13,500.00
                 After 24 hrs. thru 10 days                                           10,800.00
                 After 10 days                                                             0.00
- ----------------------------------------------------------------------------------------------------
8.       Force Majeure Rate                                                            8,775.00
- ----------------------------------------------------------------------------------------------------
9.       Early Term Fee                                                                1,000.00
- ----------------------------------------------------------------------------------------------------
10.      Demobilization Fee                                                          250,000.00
- ----------------------------------------------------------------------------------------------------
</TABLE>





                                       21

<PAGE>   1
                                                                   EXHIBIT 10.5




                               DRILLING CONTRACT

                                    BETWEEN


                            HARKEN DE COLOMBIA, LTD.

                                  ("OPERATOR")


                                      AND


                     MARLIN COLOMBIA DRILLING COMPANY, INC.

                                 ("CONTRACTOR")




                                      FOR

                                  MARLIN RIG 8




                                  MAY 15, 1997
<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                       <C>
 PART  I: SCOPE OF THE CONTRACT

1.       The Parties  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
2.       The Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
3.       Contract Duration  . . . . . . . . . . . . . . . . . . . . . . . .  1-2
4.       Drilling Operations  . . . . . . . . . . . . . . . . . . . . . . . .  3
         4.1     CONTRACTOR'S Standard of Performance   . . . . . . . . . . .  3
         4.2     The Rig  . . . . . . . . . . . . . . . . . . . . . . . . . .  3
         4.3     Drilling Program . . . . . . . . . . . . . . . . . . . . . .  4
                 4.3A     Abandonment of Well . . . . . . . . . . . . . . . .  4
                 4.3B     Completion of Well  . . . . . . . . . . . . . . . .  4
         4.4     Well Control . . . . . . . . . . . . . . . . . . . . . . . .  5
         4.5     Cuttings and Cores . . . . . . . . . . . . . . . . . . . . .  5
         4.6     Measurements and Tests . . . . . . . . . . . . . . . . . . .  5
         4.7     Safety Precautions . . . . . . . . . . . . . . . . . . . . .  5
         4.8     OPERATOR Taking Complete Control Over Drilling Operations  .  6
5.       Personnel Assigned to the Operations . . . . . . . . . . . . . . . .  6
6.       Equipment and Supplies Furnished by the Parties  . . . . . . . . . .  7
7.       Travel of Personnel  . . . . . . . . . . . . . . . . . . . . . . . .  7
8.       Transport of Equipment and Supplies  . . . . . . . . . . . . . . . .  7

PART II: ADMINISTRATION OF THE CONTRACT

9.       Import and Export of Drilling Rig, Ancillary Equipment,
         Materials and Supplies . . . . . . . . . . . . . . . . . . . . . . .  8
10.      Responsibility as to Records, Reports, Inspections, Etc. . . . . . .  8
         10.1    Reports and Inspections  . . . . . . . . . . . . . . . . . .  8
         10.2    Confidentiality  . . . . . . . . . . . . . . . . . . . . . .  9
11.      Invoicing and Paying . . . . . . . . . . . . . . . . . . . . . . . .  9
         11.1    Invoice Presentation . . . . . . . . . . . . . . . . . . . .  9
         11.2    Currency and Time of Payment . . . . . . . . . . . . . . . .  9
         11.3    Disputed Invoices. . . . . . . . . . . . . . . . . . . . . .  9
         11.4    IVA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
12.      Notices and Designation of Representatives . . . . . . . . . . . . . 10

PART III: LIABILITIES OF THE PARTIES

13.      Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.      Responsibility for Loss or Damage to CONTRACTOR Items  . . . . . . . 11
15.      Responsibility for Loss or Damage to OPERATOR Items  . . . . . . . . 12
16.      Reciprocal Indemnities . . . . . . . . . . . . . . . . . . . . . . . 12
17.      Responsibility for the Condition of the Hole . . . . . . . . . . . . 13
18.      Risk of Damage to or Loss of Underground Mineral Deposits  . . . . . 13
19.      Responsibility for Insurance . . . . . . . . . . . . . . . . . .  13-14
20.      Force Majeure  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
21.      Pollution or Contamination . . . . . . . . . . . . . . . . . . . . . 15
</TABLE>
<PAGE>   3
<TABLE>
<S>                                                                    <C>
PART  IV: LAW OF THE CONTRACT

22.      Assignment of Contract . . . . . . . . . . . . . . . . . . . . . . . 15
23.      Exhibits as Part of Contract . . . . . . . . . . . . . . . . . . . . 15
24.      Relationship of Parties  . . . . . . . . . . . . . . . . . . . . . . 16
25.      Governing Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
26.      Prior Agreements . . . . . . . . . . . . . . . . . . . . . . . . . . 16
27.      Waiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
28.      Patents and Rights . . . . . . . . . . . . . . . . . . . . . . . . . 16
29.      CONTRACTOR's Obligation To Comply with Laws  . . . . . . . . . . . . 17

PART V: COMPENSATION TO CONTRACTOR

30.      Rates of Compensation  . . . . . . . . . . . . . . . . . . . . . . . 17
         30.1    Mobilization Fee . . . . . . . . . . . . . . . . . . . . . . 17
         30.2    Operating Day Rate . . . . . . . . . . . . . . . . . . . . . 17
         30.3    Moving Rate  . . . . . . . . . . . . . . . . . . . . . . . . 17
         30.4    Standby With Crews Rate  . . . . . . . . . . . . . . . . . . 18
         30.5    Standby Without Crews Rate . . . . . . . . . . . . . . . . . 18
         30.6    Mechanical Breakdown Rate  . . . . . . . . . . . . . . . . . 18
         30.7    Negligence Remedial Rate . . . . . . . . . . . . . . . . . . 18
         30.8    Force Majeure Rate . . . . . . . . . . . . . . . . . . . . . 19
         30.9    Demobilization Fee . . . . . . . . . . . . . . . . . . . . . 19
         30.10   Application of Rates . . . . . . . . . . . . . . . . . . . . 19

31.      Reimbursable Items . . . . . . . . . . . . . . . . . . . . . . . . . 19
         31.1    Materials, Services and Personnel. . . . . . . . . . . . . . 19
         31.2    Oil-Based Drilling Fluid Incentives. . . . . . . . . . . . . 20

32.      Daily Rate Increases . . . . . . . . . . . . . . . . . . . . . . . . 20

33.      Signatures of the Parties  . . . . . . . . . . . . . . . . . . . . . 20


EXHIBITS:

         "A"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Page

         "B"  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1 thru 24

         "C"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Page

         "D"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 thru 6

         "E"  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 thru 3

ATTACHMENT "A"  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1 Page
</TABLE>
<PAGE>   4
                               DRILLING CONTRACT
                                  MARLIN RIG 8

PART I:  SCOPE OF THE CONTRACT

1.       THE PARTIES

         This agreement is entered into this 15th_ day of May, 1997, by and
         between HARKEN DE COLOMBIA, LTD. (HDC), a Cayman Islands corporation
         ("OPERATOR"), and MARLIN COLOMBIA DRILLING COMPANY, INC., a Cayman
         Islands corporation ("CONTRACTOR").

2.       THE WORK

         CONTRACTOR shall drill all  wells by the rotary method (inclusive of
         downhole motor operations and directional wells) for OPERATOR to
         depths specified by OPERATOR, but not to exceed 13,500 feet with 5"
         drill pipe unless with CONTRACTOR's agreement.  These wells shall be
         at locations selected by OPERATOR within Operator's Association
         Contract areas (the" Block(s)") located in Colombia, South America.
         CONTRACTOR represents that it possesses well-skilled employees and
         proper equipment as specified herein for performance of all its work
         under this Contract.  CONTRACTOR has knowledge of the social,
         environmental, physical, health and climatic conditions existing in
         the Blocks where the drilling operations will be undertaken.
         CONTRACTOR shall perform all operations with diligence and skill,
         applying sound engineering principles and good oil field practices,
         CONTRACTOR shall conduct operations on a full twenty-four hour day,
         seven day week basis.

3.       CONTRACT DURATION

         This Contract shall become effective upon signing by the parties and
         shall continue in effect for  one year from and after the Commencement
         Date (as defined in Section 30.2 hereof).  The parties contemplate
         that the operation will commence on or about  August 1,  1997.
         OPERATOR shall have a renewable option to extend this contract for a
         period or periods, each period being not less than 6 months nor more
         than 12 months.  OPERATOR shall notify to CONTRACTOR in writing of its
         election to extend this Contract as soon as practicable BUT NOT LATER
         THAN SIXTY (60) DAYS BEFORE THE END OF THE INITIAL TERM or subsequent
         extension period term of the Contract .  OPERATOR may terminate this
         contract effective any time after the date of spudding of the first
         well, subject to the early termination provisions herein.





                                        1
<PAGE>   5
         3.1     Contract Extension  - In the event OPERATOR exercises its
                 option to extend this Contract during one or more extension
                 periods, OPERATOR and CONTRACTOR shall meet to negotiate
                 mutually acceptable rates and Contract modifications agreeable
                 to both parties.  It is understood that market rates shall
                 prevail and shall be determined by the then standard rates for
                 similar class rigs.  Operator will not be invoiced for any
                 capital recovery related to the 5" Drill Pipe or Top Drive
                 Unit in the first or subsequent extension periods.
                 Contractor's cost of operation, maintenance and repair of the
                 5" Drill Pipe and Top Drive Unit will be included as costs to
                 be recovered in the Operating Day Rate for all contract
                 periods.

         3.2     Early Termination

                 3.2.1    Either party may immediately terminate this Contract
                          upon written notice to the other Party, if the Rig is
                          declared by either Party as a total loss except that
                          compensation properly earned up to the time of day of
                          that loss shall be owed by OPERATOR to CONTRACTOR.

                 3.2.2    Notwithstanding anything contained herein to the
                          contrary, OPERATOR shall, at any time, have the right
                          to terminate this Contract, upon thirty (30) days
                          written notice, even though CONTRACTOR has not
                          defaulted hereunder, and, in such event, CONTRACTOR
                          shall be entitled to compensation properly earned
                          through the end of that thirty (30) day notice
                          period, including the Early Termination Fee as
                          defined by 30.11.

                 3.2.3    Notwithstanding anything herein to the contrary,
                          CONTRACTOR shall have the right to terminate this
                          Contract, upon thirty (30) days written notice
                          stating that,  in CONTRACTOR's reasonable opinion, it
                          is uneconomical for CONTRACTOR to continue operations
                          under this Contract, and certifying that one of the
                          following conditions applies:

                          3.2.3.1 OPERATOR has failed to pay CONTRACTOR
                                  undisputed amounts and such amounts remain
                                  unpaid following notice and a seven day grace
                                  period,  in which case the Demobilization
                                  and Early Termination Fees shall be payable,
                                  or;


                          3.2.3.2 New government edict, decree, rule,
                                  regulation or law has been applied to
                                  CONTRACTOR or his entitlement under this
                                  Contract.





                                        2
<PAGE>   6
4.       DRILLING OPERATIONS

         4.1     CONTRACTOR'S STANDARD OF PERFORMANCE - CONTRACTOR warrants
                 that all work will be performed safely and in good and
                 workmanlike manner in accordance with accepted international
                 oilfield practices and in compliance with all applicable laws,
                 rules and regulations; that CONTRACTOR's equipment shall be in
                 good working order and its personnel fully trained and capable
                 of safely operating such equipment and performing services
                 required herein for OPERATOR; that CONTRACTOR regularly
                 conducts training and safety programs; that all materials,
                 equipment, goods, supplies or manufactured articles furnished
                 by CONTRACTOR in the performance of the work or services shall
                 be of suitable quality and workmanship for their intended
                 purposes, in accordance with specifications, and shall be free
                 from defects; and that CONTRACTOR will not employ any employee
                 whose employment violates applicable labor  or other laws.
                 CONTRACTOR further covenants, warrants and represents that all
                 work performed by it hereunder shall be conducted in
                 accordance with accepted international safety regulations (as
                 used in the country of Colombia), environmental laws and
                 regulations, precautions and procedures in effect as of the
                 effective date and by employing the necessary protective
                 equipment and devices described in the attached inventory.
                 Any breach of this safety covenant shall be grounds for
                 immediate termination of this Contract by Operator.


         4.2     THE RIG - CONTRACTOR shall furnish its' MARLIN RIG 8 which is
                 a complete drilling rig as described in Exhibit "B".
                 CONTRACTOR shall operate the rig and ancillary equipment at
                 eighty five (85) percent of manufacturer's rated operating
                 specifications.  Contractor shall provide 12,000  of new S-135
                 grade,  5" Drill Pipe,  1800   of 5" heavy weight Drill Pipe,
                 rig conversions to operate with 5" Drill Pipe, a new top drive
                 system with sufficient torque capacity to drill Operator's
                 horizontal wells, rig modifications (at OPERATOR's expense,
                 the cost for which shall be amortized over the initial term of
                 the contract) as necessary,  to accommodate underbalanced
                 drilling equipment (so long as any modifications are mutually
                 agreed between OPERATOR and CONTRACTOR) and one additional mud
                 pump independently powered and compatible with the existing
                 drilling rig equipment.    The Drilling Tubulars (Drill Pipe,
                 Heavy Weight Drill Pipe, Collars, Cross-Overs, Stabilizers,
                 Subs, etc.) will be subject to Exhibit E, "Tubular Standards".
                 In special circumstances, at OPERATOR request, CONTRACTOR in
                 its sole discretion may operate the rig and ancillary
                 equipment at manufacturer's rated operating specifications.
                 CONTRACTOR shall maintain the rig and ancillary equipment in
                 good working order.





                                        3
<PAGE>   7
                 The rig will maintain a current inspection certificate for all
                 major load bearing components.  The inspection will be
                 performed by a third party inspection contractor.

                 OPERATOR shall notify CONTRACTOR of the location of the
                 initial well.  CONTRACTOR shall  mobilize the rig, the
                 equipment described herein, and its personnel to the location
                 of the initial well and shall make all necessary preparations
                 for spudding the initial well within 25 days following
                 OPERATOR's notification of the location of the initial well.

         4.3     DRILLING PROGRAM - Before any drilling begins on any well,
                 OPERATOR shall deliver the drilling program to CONTRACTOR
                 which Contractor shall give notice to Operator of its'
                 receipt.  Contractor shall also certify in writing to Operator
                 that "rigging-up" is satisfactorily completed.  CONTRACTOR
                 shall use reasonable diligence to conduct all drilling
                 operations in conformance with OPERATOR's drilling program.
                 OPERATOR may modify the drilling program so long as any
                 modifications which materially increases CONTRACTOR's hazards
                 or costs of performance bears CONTRACTOR's approval and
                 provides for an appropriate rate increase as mutually agreed
                 by the parties.  Except as otherwise provided herein,
                 CONTRACTOR SHALL NOT BEGIN TO DISMANTLE ITS RIG AND EQUIPMENT
                 FOR DEMOBILIZATION UNTIL AUTHORIZED TO DO SO BY OPERATOR IN
                 WRITING.

                 4.3A     ABANDONMENT OF WELL:  OPERATOR at any time may elect
                          to have a well abandoned.  Upon notice of such
                          election, CONTRACTOR shall promptly remove in
                          compliance with all government rules and regulations
                          from the hole and lay down all recoverable casing and
                          tubing and plug and abandon the hole in accordance
                          with the program provided by OPERATOR in a manner
                          satisfactory to OPERATOR and in compliance with all
                          government rules and regulations including
                          environmental laws and permits and CONTRACTOR shall
                          also remove in compliance with all government rules
                          and regulations all its equipment, machinery, tools,
                          supplies and materials furnished and all its debris
                          and refuse from the location resulting from its
                          activities under this agreement.  Should CONTRACTOR
                          fail to timely and in a responsible manner fail to
                          remove the same, then all loss, delay or other
                          related liability shall be at the sole risk of
                          CONTRACTOR.

                 4.3B     COMPLETION OF WELL: OPERATOR may at any time elect to
                          have a well completed or recompleted, and in that
                          event, CONTRACTOR shall perform the work of
                          completing the well in accordance with the program
                          provided by OPERATOR in a manner and to the extent
                          desired by OPERATOR, including but not limited to the
                          running of liner and tubing, making permanent well
                          head connections and installing Christmas trees.





                                        4
<PAGE>   8
         4.4     WELL CONTROL - CONTRACTOR shall maintain their provided well
                 control equipment in good operating condition at all times,
                 and shall in addition make such further checks as OPERATOR
                 shall direct and shall use reasonable means to control and
                 prevent fires, blowouts and other damage, to protect the hole
                 and to protect OPERATOR equipment.

         4.5     CUTTINGS AND CORES - When requested by OPERATOR, CONTRACTOR
                 shall save and identify the cuttings and cores free from
                 contamination and place them in separate containers furnished
                 by OPERATOR. Such cuttings and cores shall be made available
                 to a representative of OPERATOR at the site.

         4.6     MEASUREMENTS AND TESTS - Routinely and in addition whenever
                 requested by OPERATOR, CONTRACTOR shall measure and record the
                 total length of all in-hole tubulars in service with a steel
                 tape.

         4.7     SAFETY PRECAUTIONS - OPERATOR and CONTRACTOR shall take
                 measures to provide safe working conditions and shall comply
                 with safety procedures promulgated by OPERATOR and/or by
                 applicable governmental agency, ministry or authority and
                 incorporated with this contract and without limiting the
                 generality of the foregoing, shall maintain proper barriers,
                 guard rails and other safety devices to lessen hazards during
                 the performance of work under this Contract.  Any safety
                 equipment required by OPERATOR  and provided in addition to
                 that listed in Exhibit "B" shall be for OPERATOR account.
                 CONTRACTOR shall not permit smoking, hot work or any open
                 flames at the wellsite (except in OPERATOR designated areas).
                 Smoking, hot work and open flames will be controlled via
                 permits issued by OPERATOR and may be canceled or reinstated
                 by OPERATOR due to site conditions.  CONTRACTOR shall equip
                 the rig with vapor proof lights and shall equip the drilling
                 engines' exhaust with a water injection device so as to reduce
                 the hazard of fire.  CONTRACTOR shall install on each well
                 worked on  hereunder blowout prevention devices of the type
                 shown in Exhibit "B" and shall operate such devices at all
                 times the rig is operating or otherwise on a well. Contractor
                 is aware that use of underbalanced drilling techniques are
                 expected during the term of this contract.   If required,
                 CONTRACTOR shall, within the capabilities of the equipment and
                 personnel required to be furnished by CONTRACTOR hereunder,
                 take precautions to prevent the well from igniting.
                 CONTRACTOR shall report to OPERATOR as soon as practicable all
                 accidents or occurrences resulting in injuries to CONTRACTOR's
                 employees or third parties or damage to the property of
                 CONTRACTOR, OPERATOR  or any  third parties arising out of or
                 in the course of the operations hereunder.





                                        5
<PAGE>   9
         4.8     OPERATOR TAKING COMPLETE CONTROL OVER DRILLING OPERATIONS

                 4.8A     Should any well blow-out, ignite, or in any manner
                          get out of control, OPERATOR may assume complete
                          control and supervision of the work of bringing the
                          well under control or putting out the fire.  Unless
                          and until OPERATOR so elects in writing to assume
                          such complete control, CONTRACTOR shall be in
                          complete control and supervision of the same.

                 4.8B     Should CONTRACTOR at any time fail to conduct its
                          operations in compliance with applicable laws, rules
                          and regulations,  with skill and diligence, in
                          conformance with accepted oilfield practice and sound
                          engineering principles, and in accordance with the
                          terms of this Contract, then OPERATOR shall notify
                          CONTRACTOR in writing of the specific deficiency.
                          After having received such notice, CONTRACTOR shall
                          have five days in which to fulfill its contractual
                          responsibilities by taking measures to rectify the
                          deficiency.  Should CONTRACTOR fail to correct the
                          deficiency OPERATOR may assume control of the rig and
                          ancillary equipment and continue the drilling
                          operations on that well until CONTRACTOR is proven
                          capable and accepted by the operator to resume full
                          performance of  its contractual duties.

                 4.8C     For all time during which OPERATOR is in control of
                          the drilling operations pursuant to Articles 4.8A or
                          4.8B.  OPERATOR shall have full use of CONTRACTOR's
                          rig, equipment, machinery, facilities, material,
                          supplies and personnel at the location with
                          remuneration to CONTRACTOR at the Operating Day Rate,
                          Article 30.2, and all operations shall be conducted
                          at the sole risk of OPERATOR and CONTRACTOR's
                          indemnity obligations shall be suspended.

5.       PERSONNEL ASSIGNED TO THE OPERATIONS

         CONTRACTOR shall provide the personnel listed in Exhibit "C" at its
         expense, Should CONTRACTOR provide additional personnel at OPERATOR
         request for brief periods, remuneration shall be at cost plus ten
         percent (10%).  At OPERATOR's written notice, specifying the
         deficiency, CONTRACTOR shall withdraw from the operations any employee
         OPERATOR reasonably requests.  CONTRACTOR shall pay any costs incurred
         in withdrawing and replacing the unsuitable individual.  CONTRACTOR
         shall conduct all industrial relations matters in conformance with
         applicable laws and customs.





                                        6
<PAGE>   10
6.       EQUIPMENT AND SUPPLIES FURNISHED BY THE PARTIES

         6.1     BY OPERATOR - At its expense, OPERATOR shall furnish the
                 equipment, machinery, tools, supplies, materials and services
                 listed in Exhibit "D".

         6.2     BY CONTRACTOR - At its expense, CONTRACTOR shall furnish the
                 equipment, machinery, drill strings, tools, supplies and
                 personnel as listed in Exhibits "B", "C", and "D" (subject to
                 the requirements of Exhibit E).  The parties deem these items
                 to be necessary items for the full performance of CONTRACTOR
                 duties.

         6.3     INSPECTION AND USE OF OPERATOR EQUIPMENT - Before using
                 OPERATOR furnished items, CONTRACTOR representative shall
                 visually inspect same with reasonable diligence and shall
                 advise OPERATOR of any defect observed.  All such equipment,
                 machinery, tools, and materials in CONTRACTOR's possession
                 shall remain OPERATOR's property and shall be returned to
                 OPERATOR at the end of operations in the same good state of
                 repair and operating conditions as when received, subject to
                 reasonable deterioration due to use. OPERATOR shall not be
                 entitled to any compensation for normal wear and tear
                 resulting from CONTRACTOR's use of such items.  Liability for
                 damage to OPERATOR equipment is subject to Clause 15.

7.       TRAVEL OF PERSONNEL

         CONTRACTOR shall mobilize its personnel to  the initial wellsite for
         the beginning of operations at no extra cost to OPERATOR, other than
         the mobilization fee.  CONTRACTOR shall furnish transportation to each
         wellsite for all of CONTRACTOR's personnel in connection with initial
         personnel mobilization, crew changes and final personnel
         demobilization.  CONTRACTOR shall demobilize its personnel from each
         wellsite  at the end of operations at no extra cost to OPERATOR, other
         than the demobilization fee.

8.       TRANSPORT OF EQUIPMENT AND SUPPLIES

         CONTRACTOR shall prepare its rig and equipment and supplies for
         mobilization at the beginning of operations as consideration for
         OPERATOR's payment of the lump sum Mobilization Fee in Exhibit A.  The
         same Mobilization Fee will also include in total  the transportation
         of CONTRACTOR's rig and equipment to OPERATOR's  wellsite, rigged up
         ready to spud the well to be drilled hereunder. The rig shall be ready
         to commence operations when CONTRACTOR has tested all necessary
         equipment and is ready to spud the well or run in the hole with the
         initial tools.  In the event OPERATOR is not ready to commence
         operations once CONTRACTOR is rigged up and ready, the Standby with
         Crews Rate provided in Article 30.5 shall commence and continue from
         day to day





                                        7
<PAGE>   11
         thereafter until such time as the OPERATOR has authorized the
         CONTRACTOR to commence drilling operations.  The Moving Rate shall
         apply during all time after the rig is released from one drilling
         location to move and rig up on another location.  During
         demobilization, the Demobilization Fee in Exhibit A will apply while
         CONTRACTOR'S equipment is being moved from  OPERATOR's wellsite to
         CONTRACTOR's yard.  CONTRACTOR shall furnish transportation for
         CONTRACTOR's operating supplies and materials from point of origin to
         the wellsite.   OPERATOR shall furnish transportation for OPERATOR's
         operating supplies and materials  to each  wellsite and for
         Contractor's rig and equipment to the second and subsequent wellsites.

PART II:   ADMINISTRATION OF THE CONTRACT

9.       IMPORT AND EXPORT OF DRILLING RIG, ANCILLARY EQUIPMENT, MATERIALS AND
         SUPPLIES

         CONTRACTOR's drilling rig,  MARLIN RIG 8, has been completely imported
         into  Colombia  and includes at least all of  the equipment listed in
         Exhibit "B"  and CONTRACTOR shall assume all fees, duties and taxes in
         connection therewith.  OPERATOR shall pay all import and export
         expense, including without limitation, fees, duties, taxes, port
         charges, storage charges and documentary taxes for other equipment
         required by OPERATOR not included in Exhibit "B".  CONTRACTOR's
         obligation shall be limited to arranging for the transporting,
         importing and clearing of spare parts and supplies for CONTRACTOR's
         equipment to support its operations under this Contract.

          All costs incident to the transport, importation/exportation, and
         clearing of equipment, materials and supplies,  which OPERATOR
         requests CONTRACTOR to provide, will be for OPERATOR account.  Special
         amortized equipment such as the top drive unit, drilling tubulars and
         third mud pump, requested by operator, is the responsibility of
         Contractor

10.      RESPONSIBILITY AS TO RECORDS, REPORTS, INSPECTIONS, ETC.

         10.1    REPORTS AND INSPECTIONS - CONTRACTOR shall at all times permit
                 OPERATOR and its authorized employees and representatives to
                 inspect all work performed hereunder and to witness and check
                 all measurements and tests made in connection with said work.
                 CONTRACTOR shall keep an authentic and accurate history and
                 log of said wells, including all measurements required for
                 fishing operations with a record of all down-hole equipment
                 which shall be open at all reasonable times to inspection by
                 OPERATOR and its authorized employees and representatives.
                 CONTRACTOR shall furnish each of OPERATOR's designated
                 representatives (pursuant to the Notice provision in Section
                 13) with a copy of the daily written I.A.D.C. drilling report
                 showing depths and work performed during the preceding twenty-
                 four (24) hours and any other information relative to said
                 well requested by OPERATOR.





                                        8
<PAGE>   12
         10.2    CONFIDENTIALITY - Recognizing the confidential nature of the
                 work, CONTRACTOR shall not, without OPERATOR's  prior written
                 consent, allow any third person access to the well, nor give
                 out to any third person any information concerning the well,
                 or give out to third persons, nor permit any third person to
                 examine, any samples from the well.  Upon completion of the
                 work on the well, the original history and log book, as well
                 as any copies and all other data, records and reports (except
                 one copy of the daily drilling report) of any nature
                 pertaining to CONTRACTOR's operations, shall be delivered to
                 OPERATOR, it being understood that neither CONTRACTOR nor any
                 of its employees shall retain any records or data relative to
                 any well which has reference to geologic information.  This
                 ability to maintain such confidentiality shall extend beyond
                 any termination of this contract for an additional period of
                 two years beyond the remaining term of that specific Harken de
                 Colombia, Ltd. Association Contract.

11.      INVOICING AND PAYING

         11.1    INVOICE PRESENTATION -  CONTRACTOR shall prepare invoices at
                 the end of each calendar month and after the rig is released
                 from each well and after each rig move.  The invoices shall be
                 stated in U.S. Dollars.  CONTRACTOR  shall deliver the
                 invoices to OPERATOR's representative in Bogota, Colombia,
                 with copy to its  Houston, Texas, office.

         11.2    CURRENCY AND TIME OF PAYMENT - OPERATOR shall pay invoices in
                 U.S. Dollars, provided that CONTRACTOR may request payment of
                 a portion of the invoices in local currency by so specifying
                 at the time of invoice presentation.  The exchange rate for
                 local currency payments shall be the Tasa Representativa del
                 Mercado (TRM) effective on date of invoice.  OPERATOR shall
                 pay CONTRACTOR the approved amount of invoices within thirty
                 (30) days of receipt of the invoices.   OPERATOR shall deliver
                 local currency payments to CONTRACTOR's office in  Colombia.
                 If OPERATOR fails to pay the undisputed portion of any invoice
                 within thirty days of receipt, interest shall accrue from the
                 thirty-first day at the prime rate in effect from time to time
                 at Citibank, plus two percent (2%) until payment is received,
                 but the rate of interest shall not exceed the maximum rate
                 permitted by applicable law.

         11.3    DISPUTED INVOICES - If OPERATOR disputes an item invoiced,
                 OPERATOR shall notify CONTRACTOR in writing of the item
                 disputed, specifying the reason and payment of the disputed
                 item shall be withheld until settlement of the dispute, but
                 PAYMENT SHALL BE MADE OF ANY UNDISPUTED PORTION. Payment of
                 any invoice shall not prejudice the right of OPERATOR to
                 question the correctness of any such invoice, provided that
                 within twenty-four (24) months of the date of any such invoice
                 OPERATOR shall make objection to any item or items thereof by
                 delivering CONTRACTOR written notice specifying the reasons
                 for its objection.  Should OPERATOR within such a twenty-four
                 (24) month





                                        9
<PAGE>   13
                 period so notify CONTRACTOR, adjustments shall be made between
                 the parties as the correctness of such item shall be
                 determined.  Any invoice not objected to by OPERATOR within
                 such twenty-four  month period shall be deemed final and not
                 subject to review.  OPERATOR upon written notice to
                 CONTRACTOR, within the twenty-four (24) month period an
                 invoice is received shall have the right to audit CONTRACTOR's
                 accounts and records relating to operations hereunder.

         11.4    IVA - For purposes of invoicing IVA tax applicable to this
                 construction contract, according to Article 3 of Decree 1372
                 of August 20, 1992, the Contractor deems his profit calculated
                 to be eight per cent (8%) of the value of this Contract.

12.      NOTICES AND DESIGNATION OF REPRESENTATIVES

         All notices given by OPERATOR to CONTRACTOR shall be sent by
         registered mail and telex or delivered to:



         If to OPERATOR:          HARKEN DE COLOMBIA, LTD.
                                  Carrera 6, No. 115-65 Oficina 514F
                                  Santafe de Bogota, Colombia
                                  Attn:  Alvaro Puerta
                                  Ph:    57-1-214-3444
                                  Fax:   57-7-619-2676
                                  
         with copy to:            HARKEN INTERNATIONAL, LTD.
                                  2929 Briarpark, Suite 440
                                  Houston, TX  77042
                                  Attn:   Stephen C. Voss
                                  Ph:     713-789-9595
                                  Fax:    713-789-9701

         If to CONTRACTOR:        MARLIN COLOMBIA DRILLING CO., INC.
                                  Diagonal 88 No. 27-34 Barrio El Polo
                                  Santafe de Bogota, Colombia
                                  Attn:  Mario Rodriquez
                                  Ph:  011-57-1-635-9342  or /43 /45
                                  Fax: 011-57-1-236-7101
                                  
                                  
         With copy to:            PRIDE INTERNATIONAL
                                  1500 City West Blvd, Suite 400
                                  Houston, Texas  77042
                                  Attn:  Robert E. Warren
                                  Ph:   (713) 789-1400
                                  Fax: (713) 784-9568





                                       10
<PAGE>   14
PART III:  LIABILITIES OF THE PARTIES

13.      DEFINITIONS

         As used in this contract, "OPERATOR's personnel" shall mean the
         employees, agents, personnel, invitees, etc. of OPERATOR and its
         contractors (excluding CONTRACTOR).

         "CONTRACTOR's personnel" shall mean the employees, agents, personnel,
         invitees, etc. of CONTRACTOR and its subcontractors.

14.      RESPONSIBILITY FOR LOSS OR DAMAGE TO CONTRACTOR ITEMS

         CONTRACTOR shall assume the entire risk of and be solely responsible
         for damage to or destruction or loss (by any means including blowout
         and fire) of equipment, machinery, tools, (including but not limited
         to CONTRACTOR's drill pipe, drill collars, subs, choke and kill lines,
         flexible hoses, hydraulic hoses supplies and materials furnished by
         CONTRACTOR in connection with the operations hereunder), except for
         losses or damages to equipment resulting from the following: (1) all
         occurrences when OPERATOR is in control of operations per Article 4.8;
         (2) loss in any transportation furnished by or for account of
         OPERATOR, (3) loss of or damage to equipment in the hole and (4)  the
         sole or gross negligence or willful misconduct of OPERATOR's
         personnel.  CONTRACTOR shall be responsible for equipment losses and
         damages arising under (3) above resulting from negligence by
         CONTRACTOR's personnel or lack of proper maintenance of Contractor's
         equipment.

         Based upon an inspection prior to spud of the initial well by a
         mutually acceptable third party the percent wear of all downhole
         equipment shall be established.  This percent shall be applied to
         original cost with the resulting product subtracted from the
         replacement cost.  The remainder will represent the amount of
         liability Operator will assume for downhole equipment lost or damaged
         beyond repair on the initial well.  Subsequent adjustments to
         replacement cost will be made on the basis of 12  1/2 % of original
         cost per 365 day year for drill collars and 20 % of original cost per
         365 day year for all other downhole equipment.   Reimbursement for
         equipment damaged in the hole, more than normal wear and tear, will be
         at actual cost of repair including transportation.  OPERATOR shall
         have the option to replace lost or damaged equipment in-kind; provided
         said replacement equipment is of a quality and condition acceptable to
         CONTRACTOR.





                                       11
<PAGE>   15
         Reimbursement for loss or damage to CONTRACTOR's equipment, (1) when
         OPERATOR is in control of operations per Article 4.8; or (2) during
         transportation furnished by or for the account of OPERATOR; or (3) as
         a result of the sole or gross negligence of willful misconduct of
         OPERATOR'S personnel, will be at replacement cost on location without
         any deduction for depreciation; provided that OPERATOR's liability
         hereunder shall be reduced by the proceeds of insurance, if any,
         maintained by CONTRACTOR.

15.      RESPONSIBILITY FOR LOSS OR DAMAGE TO OPERATOR ITEMS

         OPERATOR shall assume liability at all times for damage to or loss or
         destruction of OPERATOR furnished items regardless of how, when or
         where such damage, loss or destruction occurs and CONTRACTOR shall be
         under no liability to reimburse OPERATOR for such damage, loss or
         destruction except in the case where such damage, loss or destruction
         results from the sole or gross negligence or willful misconduct by
         CONTRACTOR's personnel.

16.      RECIPROCAL INDEMNITIES

         (A)     CONTRACTOR agrees to indemnify and hold harmless OPERATOR from
                 and against any and all claims, costs, liabilities, or
                 expenses for death of, or injury to CONTRACTOR's personnel or
                 loss of or damage to property of CONTRACTOR's personnel,
                 except such death, injury, property loss or property damage as
                 may result from the sole or gross negligence or willful
                 misconduct of OPERATOR's personnel.

         (B)     OPERATOR agrees to indemnify and hold harmless CONTRACTOR from
                 and against any and all claims, costs, liabilities, or
                 expenses for death of, or injury to OPERATOR's personnel or
                 loss of or damage to property of OPERATOR's personnel, except
                 such death, injury, property loss or property damage as may
                 result from the sole or gross negligence or willful misconduct
                 of CONTRACTOR's personnel.  Irrespective of the insurance
                 coverage provided by CONTRACTOR,  OPERATOR'S status as an
                 additional insured shall not be applicable except to the
                 extent CONTRACTOR has specifically assumed liability for such
                 loss or damage under this Contract.

         (C)     Neither party shall be liable to the other for special,
                 indirect or consequential damages resulting from or arising
                 out of this Contract, including without limitation, loss of
                 profit or business interruptions, however caused.





                                       12
<PAGE>   16
17.      RESPONSIBILITY FOR THE CONDITION OF THE HOLE

         OPERATOR shall be responsible for the condition of the hole and shall
         defend, indemnify and hold CONTRACTOR harmless from and against any
         claims arising from damage to or loss of the hole resulting from any
         of the hazards of drilling or completion operations, including the
         cost of regaining control of the hole.   If the hole is lost solely
         due to the gross negligence of CONTRACTOR or its'  personnel,
         CONTRACTOR shall redrill the hole or drill a new hole, to the depth at
         which the hole was lost, at the negligence remedial rate, as
         OPERATOR's sole and exclusive remedy.  During any such period of
         remedial drilling, the parties shall continue their respective
         responsibilities under this Contract, including without limitation,
         those responsibilities concerning furnishment of supplies and
         materials.

18.      RISK OF DAMAGE TO OR LOSS OF UNDERGROUND MINERAL DEPOSITS

         OPERATOR assumes the entire risk of damage to or loss or destruction
         of underground mineral deposits, reservoirs, or pools, and from any
         loss of oil and gas resulting from operations under this Contract if
         at the time of the act or omission causing such damage, loss or
         destruction, the oil or gas had not been reduced to physical
         possession above the surface of the earth.  OPERATOR shall hold
         CONTRACTOR harmless against any such damage to the mineral deposits,
         reservoirs, or pools, and from any loss of oil and gas resulting from
         operations under this Contract regardless of the cause of such loss or
         damage if at the time of the act or omission causing such damage, loss
         or destruction, the oil or gas had not been reduced to physical
         possession above the surface of the earth.

19.      RESPONSIBILITY FOR INSURANCE

         CONTRACTOR shall at all times during the term of this agreement
         purchase or provide insurance coverage in amounts no less than the
         amounts provided in this Article 19.  The insurance companies will be
         reasonably acceptable to OPERATOR and CONTRACTOR shall provide
         OPERATOR certificates evidencing the coverage.  CONTRACTOR agrees that
         all policies required shall include an endorsement waiving the rights
         of subrogation against OPERATOR for liabilities specifically assumed
         by CONTRACTOR under this Contract.  OPERATOR will be named an
         additional insured under CONTRACTOR's General Liability and Automobile
         Liability policies to the extent of the liabilities specifically
         assumed by CONTRACTOR under the terms of this Contract. Such policies
         shall provide for thirty (30) days notice in writing to OPERATOR in
         the event of cancellation or material change in coverage.  In the
         event subcontractors are used by CONTRACTOR, CONTRACTOR will require
         such subcontractors to maintain Worker's Compensation and General
         Liability Insurance commensurate with the work being subcontracted.
         Any claim against Worker's Compensation or Liability Insurance shall
         be defended or discharged by CONTRACTOR.  The insurance coverage's
         are:





                                       13
<PAGE>   17
         Worker's Compensation Insurance sufficient to comply with the laws of
         the State of Texas  to cover Expatriate employees.  CONTRACTOR shall
         further comply with the laws of  Colombia related to employment and
         labor including any Worker's Compensation and Worker's Insurance or
         other similar requirements regarding National employees, and shall
         carry Employer's Liability Insurance with limits of U.S. $300,000 for
         injury to or death of each person and U.S. $1,000,000 for injuries to
         or death of more than one person by reason of each occurrence;

         Comprehensive General Liability Insurance with limits of U.S.  $300,000
         for injury to or death of one person, U.S. $1,000,000 for injury to or
         death of more than one person by reason of each occurrence and
         property damage coverage for loss of or damage to the property of
         third persons in the amount of U.S. $1,000,000 for any occurrence;

         Comprehensive Automobile Liability Insurance with limits of U. S.
         $250,000 per person with a limit of U.S. $1,000,000 each occurrence
         and U.S. $1,000,000 property damage each occurrence;

         Rig Casualty Insurance sufficient to protect CONTRACTOR against loss
         or damage to the drilling equipment specified in Exhibit "B" to be
         supplied by CONTRACTOR.  Such Rig Casualty Insurance shall provide for
         a waiver of subrogation as to OPERATOR, limited to the extent of the
         specific liabilities assumed by CONTRACTOR in this Contract.

         Excess Liability coverage in an amount of U.S. $5,000,000.

         CONTRACTOR shall obtain any other coverage required by the laws of the
         Colombia.

20.      FORCE MAJEURE

         Except for obligations for the payment of money, neither party shall
         be liable for loss or damage arising out of any delay or failure of
         performance caused by circumstances beyond its control, including but
         not limited to earthquake, flood, hurricane, acts of God or public
         enemies, war, national emergency, invasion, insurrection, riots,
         strikes, picketing, boycott, interruption of services rendered by any
         public utility or interference by any governmental agency or official
         (whether legal or illegal) . Nor shall any delay or failure of
         performance due to any of said causes be deemed a breach of or a
         default in the performance of this Contract.  The party prevented from
         performing for any such cause shall promptly notify the other and
         shall do all things reasonably possible to remove such cause and shall
         resume performance hereunder as soon as such cause is removed.  Should
         any act of force majeure causing the suspension of operations
         hereunder continue for a period of thirty (30) days or more, OPERATOR
         shall have the right to terminate this agreement by giving CONTRACTOR
         five (5) days prior notice of its intention to do so, subject to
         payment in accordance with Articles 30.4 and 30.3 and 30.11.





                                       14
<PAGE>   18
21.      POLLUTION OR CONTAMINATION

         OPERATOR shall assume all liability for and defend, indemnify, hold
         CONTRACTOR harmless from any loss or damage arising from pollution or
         contamination except if caused by CONTRACTOR's gross or willful
         negligence, including but not limited to that which may result from
         (1) blowout, fire, cratering,  or any other uncontrolled flow of oil,
         gas or water during the conduct of operations hereunder and (2) the
         use or disposition of oil emulsion, oil base or chemically treated
         drilling fluids, well cuttings, and cavings, lost circulation and
         fishing operations, recovery of materials and fluids, as well as the
         furnishing of transportation for and disposition of such materials
         when required, and then in such event CONTRACTOR will be liable for up
         to $1,000,000 in such pollution damages (the limit of CONTRACTOR's
         insurance).  Contractor shall assume liability for spills of pipe
         dope, greases, solvents, or other similar surface materials under its
         control. OPERATOR acknowledges that CONTRACTOR currently maintains
         $1,000,000 of insurance coverage for pollution and contamination
         liability.  OPERATOR shall have the right to require CONTRACTOR to
         carry additional insurance for pollution and contamination liability,
         provided that OPERATOR shall be responsible of the costs of such
         additional insurance.

PART IV:  LAW OF THE CONTRACT

22.      ASSIGNMENT OF CONTRACT

         At any time after the effective date of this Contract, OPERATOR shall
         have the right , for all or any portion of the initial or subsequent
         term of this Contract, to assign its rights under this Contract and to
         delegate its obligations under this Contract, provided that any such
         assignee agrees in writing to be bound by the terms of this Contract
         as if such assignee were OPERATOR hereunder.  During the period of any
         such assignment, CONTRACTOR agrees that CONTRACTOR shall look solely
         to such assignee for performance of this Contract, including the
         provisions of this Contract with respect to compensation of CONTRACTOR
         and indemnification.

         22.1    In the event of assignment of this Contract, all applicable
                 rates under this Contract,  in addition to adjustments for
                 operations in assignee's area,  shall become the
                 responsibility of such third party from date of release of rig
                 from OPERATOR until date of release of rig from the third
                 party except that nothing herein contained shall release
                 OPERATOR from CONTRACTOR's compensation during such assignment
                 in the event such party fails to pay CONTRACTOR all amounts
                 due under such assignment.

23.      EXHIBITS AS PART OF CONTRACT

         Exhibits "A", "B", "C", "D" and "E" (including Attachment "A")are
         attached hereto and shall be considered to be part of this agreement
         to the same extent





                                       15
<PAGE>   19
         as if incorporated in the body hereof.  For better identification,
         such exhibits shall be initialed by both parties.

24.      RELATIONSHIP OF PARTIES

         The work shall be performed by CONTRACTOR as an independent contractor
         and CONTRACTOR's employees shall at all times be under the direction
         and control of CONTRACTO. CONTRACTOR will receive directions from
         OPERATOR as to the end results to be accomplished, and CONTRACTOR
         shall be responsible for directing its employees as to the manner and
         means of accomplishing the work to be performed by CONTRACTOR pursuant
         to good and workmanlike practices.  Compliance by CONTRACTOR, or its
         employees, with engineering directions, safety practices, maintenance
         instructions or change of orders issued by OPERATOR shall not affect
         CONTRACTOR's status as an independent contractor and shall not relieve
         CONTRACTOR of the obligations assumed by him under this Contract.

25.      GOVERNING LAW

         This agreement and interpretation hereof shall be governed by the laws
         of the State of Texas, exclusive of the choice of law rules thereof,
         as if therein to be wholly performed.

26.      PRIOR AGREEMENTS

         No prior stipulations, agreements or understanding by the parties or
         any of their representatives shall be valid or enforceable unless
         embodied in this Contract or covered by its provisions or added by
         separate letter executed by both parties or their agents.

27.      WAIVER

         The waiver of or failure to require the performance of any covenant or
         obligation contained in this Contract shall not be deemed to
         constitute a waiver of a similar later breach.

28.      PATENTS AND RIGHTS

         OPERATOR shall not be liable or responsible for any damages or claims
         of any kind arising out of real or alleged patent infringements,
         design trademark or name or other protected rights which arise out of
         or are caused by or are attributed, directly or indirectly, to any
         work carried out and/or any equipment used by CONTRACTOR or its
         subcontractors and CONTRACTOR shall indemnify, save and hold harmless
         OPERATOR, its officers, employees, agents and servants from and
         against such damages and claims.  CONTRACTOR shall not be liable or
         responsible for any damages or claims of any kind arising out of real
         and alleged patent infringements, design trademark or name or other
         protected rights which arise out of or are caused by or are





                                       16
<PAGE>   20
         attributed to, directly or indirectly, any work carried out and/or any
         equipment, except the equipment of CONTRACTOR and its subcontractors,
         used by OPERATOR and OPERATOR shall indemnify, save and hold harmless
         CONTRACTOR, its officers, employees, agents and servants from and
         against such damages and claims.

29.      OBLIGATION TO COMPLY WITH LAWS

         CONTRACTOR and OPERATOR agree to comply with all permits, concessions
         and clearances provided to each other (and with all applicable laws
         and regulations) that govern the performance of each party's
         obligations under this Contract.  Each party shall indemnify the other
         party against any and all liabilities, damages, claims, fines,
         penalties and expense of whatsoever nature resulting from either
         party's  failure to comply with this provision.  CONTRACTOR represents
         that it is qualified to do business and is established on a proper
         legal basis to perform this Contract for OPERATOR in Colombia.

PART V:  COMPENSATION TO CONTRACTOR

30.      RATES OF COMPENSATION - None of the rates specified under this Clause
         30 shall begin to accrue until the Commencement Date.

         CONTRACTOR shall perform drilling operations and fulfill its
         obligations according to this Contract.  OPERATOR shall pay CONTRACTOR
         as full compensation for the work performed and material, equipment
         and supplies furnished as follows:

         30.1    Mobilization Fee - Initial wellsite will  be determined prior
                 to Mobilization Fee being quoted by CONTRACTOR and approved by
                 OPERATOR.  OPERATOR shall pay CONTRACTOR in a lump sum the
                 amount set forth as Exhibit "A", Item 1, for CONTRACTOR
                 mobilizing its personnel which are located at Torcaz 2 and
                 its' rig and ancillary equipment and materials and supplies
                 from the Torcaz field area of the Middle Magdalena Valley to
                 Operator's wellsite.   OPERATOR shall pay this amount within
                 thirty days of receiving CONTRACTOR's invoice bearing the date
                 of departure of the rig from the Torcaz Field.

         30.2    Operating Day Rate - This rate is set forth as Exhibit "A",
                 Item 2.  Unless superseded by another rate, beginning on the
                 day CONTRACTOR is ready to spud the first well (the
                 "Commencement Date") and continuing all the time until the rig
                 is released in preparation for rigging down to move.


         30.3    Moving Rate - This rate is set forth as Exhibit "A", Item 3.
                 This rate shall apply during  rigging up operations, during
                 dismantling operations and for all time spent moving the rig
                 from one wellsite to another wellsite.  Operator and
                 Contractor shall, within 24 hours or earlier of rig release





                                       17
<PAGE>   21
                 from Operator's wellsite, mutually agree to a single lump sum
                 transportation fee to transport all of Contractor's rig and
                 equipment to Operator's next wellsite.   If mutual agreement
                 on a lump sum fee cannot be reached then Contractor's
                 equipment will be moved using Operator furnished
                 transportation and Contractor shall invoice Operator for all
                 moving days at the Moving Rate specified in Exhibit "A".

         30.4    Standby With Crews Rate - This rate is set forth in Exhibit
                 "A", Item 4.  Except for the situation set forth in Article
                 30.6, whenever the rig is shut down at OPERATOR's request, the
                 rig shall be considered to be standing by with crews.  The
                 Operating Day Rate shall be payable for the first 24 hours
                 after Operator's request and thereafter the Standby With Crews
                 Rate shall be payable until the standby with crews status
                 ends.

         30.5    Standby Without Crews Rate -  This rate is set forth as
                 Exhibit "A", Item 5.  Whenever in OPERATOR'S sole judgment the
                 estimated period of OPERATOR requested rig shut down is long
                 enough to warrant demobilization of personnel, cessation of
                 camp operations or other cost reductions, OPERATOR may place
                 the rig on the Standby Without Crews Rate upon five days
                 written notice to CONTRACTOR.   OPERATOR shall reimburse
                 CONTRACTOR in demobilizing CONTRACTOR's personnel from point
                 of origin and remobilizing them in connection with a period of
                 Standby Without Crews status at cost plus ten percent (10%).


                 30.5.1      Following the  completion of Torcaz 2 the then
                             standby without crew rate of $2340/day shall apply
                             following installation and successful testing of
                             Top Drive until mobilization commences from Torcaz
                             2 to Catalina 1.

         30.6    Mechanical Breakdown Rate - This rate is set forth at Exhibit
                 "A", Item 6 and is applied as follows: if there is a work
                 stoppage due to mechanical failure not primarily caused by the
                 negligence of CONTRACTOR's personnel, payment shall be at the
                 full Operating Day Rate for any such stoppage up to
                 twenty-four hours per occurrence.  Thereafter, CONTRACTOR
                 shall be entitled to receive the Mechanical Breakdown Rate
                 until the breakdown is repaired.  Cumulative invoices by
                 CONTRACTOR  to OPERATOR under this Clause 30.6 shall not
                 exceed $250,000 for any 365 day time period.

         30.7    Negligence Remedial Rate

                 30.7.1     This rate is set forth at Exhibit "A", Item 7 and
                            is applied as follows:  If there is a work stoppage
                            as a  primary result of the negligence of
                            CONTRACTOR's personnel, OPERATOR shall pay the
                            Operating Day Rate for any such stoppage up to
                            twenty-four hours.  Thereafter, the rate shall be
                            at the





                                       18
<PAGE>   22
                            Negligence Remedial Rate until the breakdown is
                            repaired or for ten days whichever first occurs.
                            If a breakdown under this Article 30.7.1 continues
                            for more than ten days, CONTRACTOR shall earn zero
                            rate beginning with the eleventh day until the
                            breakdown is repaired.   Total payments under this
                            Clause 30.7.1 shall not to exceed $100,000 during
                            the initial term of this contract and $50,000
                            during subsequent terms.

                 30.7.2     The Negligence Remedial Rate shall be payable for
                            all time, without limitation, spent at drilling
                            operations as provided in Article 17.

      30.8       Force Majeure Rate - This rate is set forth at Exhibit "A",
                 Item 8.  The Force Majeure Rate shall be payable whenever a
                 condition of force majeure exists as described in Article 20.
                 Total payments under this Clause 30.8 shall not exceed
                 $100,000 during the initial terms of this contract and $50,000
                 during subsequent terms.

       30.9      Demobilization Fee - OPERATOR shall pay CONTRACTOR in a lump
                 sum the amount set forth as Exhibit "A", Item 9, as a
                 demobilization fee within thirty days of receiving
                 CONTRACTOR's invoice bearing the date the rig, ancillary
                 equipment and supplies departs OPERATOR's last wellsite.

      30.10      Application of Rates - The rates set forth in this Article 30
                 apply for a full 24-hour day and shall be prorated when two or
                 more rates apply to parts of a single 24-hour day.  Only one
                 rate or fee shall be payable at any one time.  During rigging
                 up, dismantling and well to well movement operations, the full
                 daily rate shall be payable even if operations are conducted
                 only during the daylight portion of the day.


      30.11      Early Termination Fee - In the event this Contract is
                 terminated by OPERATOR prior to the one year initial term,
                 CONTRACTOR will receive, in addition to the compensation
                 provided in Section 3.2.2, the Early Termination Fee.  The
                 Early Termination Fee shall not exceed 90 days at the Standby
                 Without Crew Rate, the applicable Demobilization Fee and the
                 remaining unrecovered cost of the 5" Drill Pipe and Top Drive
                 Unit.

31.      REIMBURSABLE ITEMS

         31.1    Materials, Services and Personnel - If OPERATOR requests
                 CONTRACTOR to provide materials, services or personnel in
                 addition to those specified in this Contract.  OPERATOR shall
                 reimburse CONTRACTOR for such materials and services as are
                 actually furnished at CONTRACTOR cost plus fifteen percent
                 (15%).  If any additional personnel are furnished by
                 CONTRACTOR on a short term





                                       19
<PAGE>   23
                 basis, OPERATOR shall reimburse CONTRACTOR at cost plus
                 fifteen percent  (15%).

         31.2    Oil-Based Drilling Fluid Incentives - For each day of the
                 Contract term during which oil base drilling fluid is in use,
                 OPERATOR shall reimburse CONTRACTOR at the rate of U.S. $10.00
                 per person for incentive payments to those staff personnel and
                 U.S.$4.00 per person for incentive payments to those non-staff
                 personnel assigned to the operation who are actually on a rig
                 tour on a day when oil base drilling fluid is in use.
                 CONTRACTOR shall invoice OPERATOR separately for this
                 reimbursement each month and shall support the invoice with a
                 schedule of incentive payments made.

32.      DAILY RATE INCREASES

         The rates established in the Contract are based on current costs as of
         the date of this contract.  If after the execution of this agreement,
         CONTRACTOR shall demonstrate to the reasonable satisfaction of
         OPERATOR that an increase has occurred in any component, or the sum of
         several components of CONTRACTOR's costs that increases said costs in
         excess of 5%, the daily rate shall be appropriately adjusted in an
         amount equal to such cost changes.  Daily Rate increases under this
         Clause shall not exceed 10% of the Operating Day Rate during any 12
         month period.

33.      SIGNATURES OF THE PARTIES

         IN WITNESS OF THE COVENANTS AND CONDITIONS OF THE FOREGOING THIRTY-
         THREE ARTICLES OF THIS CONTRACT AND THE EXHIBITS HERETO, the parties
         execute two (2) copies of this Contract, one of which shall be
         retained by OPERATOR and one of which shall be retained by CONTRACTOR.



      OPERATOR                             CONTRACTOR

HARKEN DE COLOMBIA, LTD.                   MARLIN COLOMBIA DRILLING
                                           COMPANY, INC.

By: /s/ BRUCE N. HUFF                      By: /s/ ROBERT E. WARREN    
   -------------------------------            --------------------------
        Bruce N. Huff                              Robert E. Warren
Title:  Sr. V.P. & Director              Title:    Vice President     
       ---------------------------               -----------------------
Date:   May 15, 1997                      Date:    May 15, 1997         
      ----------------------------              ------------------------





                                       20
<PAGE>   24
                                  EXHIBIT A
                   MARLIN COLOMBIA DRILLING COMPANY - RIG 8
                               RATES OF PAYMENT
                          HARKEN DE COLOMBIA, LTDA.



<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
ITEM                    DESCRIPTION                     FEE RATE IN U.S. $
- --------------------------------------------------------------------------------
<S>                     <C>                             <C>
1.             Mobilization Fee
                   Torcaz 2 to Catalina No. 1            $ 210,000
- --------------------------------------------------------------------------------
2.             Operating Day Rate
                   with 3rd Pump                         $  12,038     + $6,200
- --------------------------------------------------------------------------------
3.             Moving Rate                               $   7,825     + $6,200
- --------------------------------------------------------------------------------
4.             Standby with Crews Rate                   $  10,972     + $6,200
- --------------------------------------------------------------------------------
5.             Standy without Crews Rate                 $   3,500     + $6,200
- --------------------------------------------------------------------------------
6.             Mechanical Breakdown Rate   
                   1st 24 hrs. Per occurrence            $  12,038     + $6,200
                   After 24 hrs. Per occurrence          $   7,825     + $6,200
- --------------------------------------------------------------------------------
7.             Negligence Remedial Rate
                   1st 24 hrs.                           $  12,038
                   After 24 hrs. thru 30 days            $  10,972
                   After 30 days                         $       0
- --------------------------------------------------------------------------------
8.             Force Majeure Rate                        $  10,972
- --------------------------------------------------------------------------------
9.             Demobilization Fee                        $ 280,000*
- --------------------------------------------------------------------------------
10.            Early Termination Fee                     (90 Days x $3500/day) +
                                                         Term remaining in days
                                                         x $6,200/day
- --------------------------------------------------------------------------------
11.            Catering and Lodging                      $   12.00/meal
- --------------------------------------------------------------------------------
12.            Patio Hands                               $   50.00/day each
- --------------------------------------------------------------------------------
</TABLE>


* Unless mobed to another client within 30 days, then 100,000.

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                     109,496,000
<SECURITIES>                                         0
<RECEIVABLES>                                2,286,000
<ALLOWANCES>                                 (340,000)
<INVENTORY>                                          0
<CURRENT-ASSETS>                           111,872,000
<PP&E>                                      97,126,000
<DEPRECIATION>                            (16,074,000)
<TOTAL-ASSETS>                             199,914,000
<CURRENT-LIABILITIES>                        6,538,000
<BONDS>                                     89,300,000
                                0
                                          0
<COMMON>                                     1,054,000
<OTHER-SE>                                 103,022,000
<TOTAL-LIABILITY-AND-EQUITY>               199,914,000
<SALES>                                      6,844,000
<TOTAL-REVENUES>                             8,278,000
<CGS>                                        2,486,000
<TOTAL-COSTS>                                2,486,000
<OTHER-EXPENSES>                             4,830,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             848,000
<INCOME-PRETAX>                                114,000
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            114,000
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   114,000
<EPS-PRIMARY>                                     0.00
<EPS-DILUTED>                                     0.00
        

</TABLE>


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