ANADARKO PETROLEUM CORP
S-8, 1994-07-08
CRUDE PETROLEUM & NATURAL GAS
Previous: DEFINED ASSET FUNDS CORPORATE INCOME FD MON PYMT SER 223, 24F-2NT, 1994-07-08
Next: BEAR STEARNS COMPANIES INC, 424B3, 1994-07-08



<PAGE>   1


      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 8, 1994
                                                        REGISTRATION NO.
================================================================================

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C.  20549

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

                                    FORM S-8
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                                ---------------
                                
                         ANADARKO PETROLEUM CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

              DELAWARE                                     76-0146568
    (STATE OR OTHER JURISDICTION                        (I.R.S.  EMPLOYER
 OF INCORPORATION OR ORGANIZATION)                     IDENTIFICATION NO.)

                  17001 NORTHCHASE DRIVE, HOUSTON, TEXAS 77060
             (ADDRESS OF  PRINCIPAL EXECUTIVE OFFICES)  (ZIP CODE)

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

                           1993 STOCK INCENTIVE PLAN
                            (FULL TITLE OF THE PLAN)

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

                                 SUZANNE SUTER
                             17001 NORTHCHASE DRIVE
                              HOUSTON, TEXAS 77060
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)

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

                                 (713) 875-1101
         (TELEPHONE NUMBER, INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
=======================================================================================================================
                                                                                      Proposed
                                                                  Proposed             maximum
        Title of                                                  maximum             aggregate
     securities to                       Amount to be          offering price         offering            Amount of
      be registered                       registered            per share(*)          price(*)         registration fee
- -----------------------------------------------------------------------------------------------------------------------
<S>                                   <C>                         <C>               <C>                    <C>     
Common Stock, $0.10  par value,
 and Rights attached thereto          4,000,000 shares            $52.4375          $209,750,000           $72,328

=======================================================================================================================
</TABLE>
(*)      Estimated solely for the purpose of determining the registration fee
         in accordance with Rule 457(c) and (h) under the Securities Act of
         1933, as amended, based on the average of the high and low prices of
         the Common Stock as reported on The New York Stock Exchange, Inc.
         Composite Transactions Reporting system on July 1, 1994.

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


<PAGE>   2



                                    PART II


ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents filed by Anadarko Petroleum Corporation (the
"Company") with the Securities and Exchange Commission (the "Commission")
pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange
Act") (File No. 1-8968) are incorporated herein by reference:  (a) Form 8-A,
filed on September 4, 1986, for registration of Common Stock, (b) Form 8-A,
filed on October 5, 1988, for registration of Series A Preferred Stock Purchase
Rights, (c) Annual Report on Form 10-K for the fiscal year ended December 31,
1993 (the "Form 10-K"), which contains the consolidated financial statements of
the Company and its subsidiaries, (d) Quarterly Report on Form 10-Q for the
fiscal quarter ended March 31, 1994, and (e) Form 10-K/A, dated June 28, 1994,
which contains the Annual Report of the Anadarko Employee Savings Plan on Form
11-K.  All other documents filed by the Company pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this
Registration Statement and prior to the termination of the offering of the
Securities shall be deemed to be incorporated by reference in this Registration
Statement and to be a part hereof from the date of filing of such documents.

         Any statement incorporated by reference herein shall be deemed to be
modified or superseded for purposes of this Registration Statement to the
extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement.  Any statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part
of this Registration Statement.

         The consolidated financial statements and schedules of the Company and
subsidiaries as of December 31, 1993 and 1992 and for each of the years in the
three-year period ended December 31, 1993 incorporated by reference in the
Registration Statement have been incorporated herein in reliance upon the
report of KPMG Peat Marwick, independent certified public accountants,
incorporated by reference herein, and upon the authority of said firm as
experts in accounting and auditing.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section 145 of the Delaware General Corporation Law provides for
indemnification of officers and directors under certain conditions.
<PAGE>   3
         Article IX of the By-Laws of the Company provides for indemnification
of officers and directors to the fullest extent which may be provided by a
by-law under applicable law.

         The Company maintains insurance for officers and directors of the
Registrant against certain liabilities, including liabilities under the
Securities Act of 1933, under insurance policies, the premiums of which are
paid by the Company.  The effect of these is to indemnify any officer or
director of the Registrant against expenses, judgments, attorney's fees and
other amounts paid in settlements incurred by an officer or director upon a
determination that such person acted in good faith.

ITEM 8.  EXHIBITS.

         Exhibits not incorporated by reference to a prior filing are
designated by an asterisk (*) and are filed herewith; all exhibits not so
designated are incorporated by reference to a prior filing as indicated.

         *4.1    Revolving Credit Agreement, Dated as of May 24, 1994

         *4.2    364-Day Credit Agreement, Dated as of May 24, 1994

         *5      Opinion of Counsel to the Company.

         *23     Consent of KPMG Peat Marwick, Independent Certified Public
                 Accountants.

         *24     Powers of Attorney.

ITEM 9.  UNDERTAKINGS.

                 (a)  The undersigned registrant hereby undertakes:

                          (1)  To file, during any period in which offers or
                 sales are being made, a post-effective amendment to this
                 registration statement:

                                  (i)  To include any prospectus required by
                          Section 10(a)(3) of the Securities Act of 1933;

                                  (ii)  To reflect in the prospectus any facts
                          or events arising after the effective date of the
                          registration statement (or the most recent
                          post-effective amendment thereof) which, individually
                          or in the aggregate, represent a fundamental change
                          in the information set forth in the registration
                          statement; and

                                  (iii)  To include any material information
                          with respect to the plan of distribution not
                          previously disclosed in the registration statement
<PAGE>   4
                          or any material change to such information in the 
                          registration statement;

                 Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do
                 not apply if the information required to be included in a
                 post-effective amendment by those paragraphs is contained in
                 periodic reports filed by the registrant pursuant to Section
                 13 or Section 15(d) of the Securities Exchange Act of 1934
                 that are incorporated by reference in the registration
                 statement.

                          (2)  That, for the purpose of determining any
                 liability under the Securities Act of 1933, each such post-
                 effective amendment shall be deemed to be a new registration
                 statement relating to the securities offered therein, and the
                 offering of such securities at that time shall be deemed to be
                 the initial bona fide offering thereof.

                          (3)  To remove from registration by means of a
                 post-effective amendment any of the securities being
                 registered which remain unsold at the termination of the
                 offering.

                 (b)  The undersigned registrant hereby undertakes that, for
         purposes of determining any liability under the Securities Act of
         1933, each filing of the registrant's annual report pursuant to
         Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (and,
         where applicable, each filing of an employee benefit plan's annual
         report pursuant to Section 15(d) of the Securities Exchange Act of
         1934) that is incorporated by reference in the registration statement
         shall be deemed to be a new registration statement relating to the
         securities offered therein, and the offering of such securities at
         that time shall be deemed to be the initial bona fide offering
         thereof.

                 (c)  Insofar as indemnification for liabilities arising under
         the Securities Act of 1933 may be permitted to directors, officers and
         controlling persons of the registrant pursuant to any charter
         provision, by-law, contract, arrangement, statute, or otherwise, the
         registrant has been advised that in the opinion of the Commission such
         indemnification is against public policy as expressed in the
         Securities Act of 1933 and is, therefore, unenforceable.  In the event
         that a claim for indemnification against such liabilities (other than
         the payment by the registrant of expenses incurred or paid by a
         director, officer or controlling person of the registrant in the
         successful defense of any action, suit or proceeding) is asserted
         against the registrant by such director, officer or controlling person
         in connection with the securities being registered, the registrant
         will, unless in the opinion of its counsel the matter has been settled
         by controlling precedent, submit to a
<PAGE>   5
         court of appropriate jurisdiction the question of whether such
         indemnification by it is against public policy as expressed in the
         Securities Act of 1933 and will be governed by the final adjudication
         of such issue.


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized in the City of Houston, State of Texas, on the 8th day of July,
1994.
        
                                        ANADARKO PETROLEUM CORPORATION


                                        By  /s/ ROBERT J. ALLISON, JR.  
                                                Robert J. Allison, Jr.
                                          Chairman of the Board, President 
                                             and Chief Executive Officer



         Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities indicated on July 8, 1994:

                 Signature                                Title
                 ---------                                -----

  (i)  Principal executive officer:*


        /s/ ROBERT J. ALLISON, JR.                Chairman of the Board,
            Robert J. Allison, Jr.                  President and Chief
                                                    Executive Officer


 (ii)  Principal financial officer:*


          /s/ MICHAEL E. ROSE                     Senior Vice President,
              Michael E. Rose                       Finance and Chief
                                                    Financial Officer


(iii)  Principal accounting officer:*


          /s/ JAMES R. LARSON                     Controller
              James R. Larson
<PAGE>   6
 (iv)  Directors:*


           /s/ ROBERT J. ALLISON, JR.    
               Robert J. Allison, Jr.

               /s/ LARRY BARCUS          
                   Larry Barcus

               /s/ RONALD BROWN          
                   Ronald Brown

              /s/ JAMES L. BRYAN         
                  James L. Bryan

              /s/ JOHN R. GORDON         
                  John R. Gordon

              /s/ CONRAD P. ALBERT       
                  Conrad P. Albert


*Signed on behalf of the registrant and each of these persons:


By          /s/ SUZANNE SUTER                   
     (Suzanne Suter, Attorney-in-Fact)

<PAGE>   7

                              INDEX TO EXHIBITS.


         Exhibits not incorporated by reference to a prior filing are
designated by an asterisk (*) and are filed herewith; all exhibits not so
designated are incorporated by reference to a prior filing as indicated.

         *4.1    Revolving Credit Agreement, Dated as of May 24, 1994

         *4.2    364-Day Credit Agreement, Dated as of May 24, 1994

         *5      Opinion of Counsel to the Company.

         *23     Consent of KPMG Peat Marwick, Independent Certified Public
                 Accountants.

         *24     Powers of Attorney.




<PAGE>   1
 
                                                                [CONFORMED COPY]
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                         ANADARKO PETROLEUM CORPORATION
 
                             ---------------------
 
                           REVOLVING CREDIT AGREEMENT

                             --------------------- 
                            DATED AS OF MAY 24, 1994
                             ---------------------

                                  $250,000,000
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                               TABLE OF CONTENTS
 
<TABLE>
<S>        <C>    <C>                                                                        <C>
                                            ARTICLE I
                                DEFINITIONS AND ACCOUNTING TERMS
SECTION     1.01  Defined Terms............................................................     1
            1.02  Use of Defined Terms.....................................................     6
            1.03  Accounting Terms.........................................................     6

                                           ARTICLE II
                                    AMOUNT AND TERMS OF LOANS
SECTION     2.01  Loans....................................................................     6
            2.02  Notes....................................................................     7
            2.03  Procedure for Borrowing..................................................     7
            2.04  Commitment Fees..........................................................     7
            2.05  Reduction or Termination of Commitments..................................     8
            2.06  Optional Prepayments.....................................................     8
            2.07  Mandatory Prepayments....................................................     8
            2.08  Repayment of Loans.......................................................     9
            2.09  Interest Rate............................................................     9
            2.10  Computation of Interest and Fees.........................................     9
            2.11  Pro Rata Treatment and Payments..........................................     9
            2.12  Increased Cost of Loans..................................................    10
            2.13  Illegality...............................................................    11
            2.14  Withholding Tax Exemption................................................    12
            2.15  Substitute Loan Basis....................................................    12
            2.16  Determination of Borrowing Base..........................................    13
            2.17  Certain Prepayments or Conversions Pursuant to Sections 2.12 and 2.13....    14
            2.18. Certain Notices..........................................................    14
            2.19. Use of Proceeds..........................................................    14
            2.20. Indemnity................................................................    14
            2.21  Minimum Amounts of Tranches..............................................    14
            2.22  Conversion and Continuation Options......................................    14

                                           ARTICLE III
                                 REPRESENTATIONS AND WARRANTIES
SECTION     3.01  Representations and Warranties by the Company............................    15

                                           ARTICLE IV
                                    COVENANTS OF THE COMPANY
SECTION     4.01  Covenants................................................................    16

                                            ARTICLE V
                                      CONDITIONS OF LENDING
SECTION     5.01  Conditions Precedent to the Initial Loans................................    18
            5.02  Conditions Precedent to Loans............................................    19

                                           ARTICLE VI
                                        EVENTS OF DEFAULT
SECTION     6.01  Events of Default........................................................    19
</TABLE>
 
                                        i
<PAGE>   3
 
<TABLE>
<S>        <C>    <C>                                                                        <C>
                                           ARTICLE VII
                               THE AGENT AND THE DETERMINING BANKS
SECTION     7.01  Powers...................................................................    20
            7.02  Agent's Reliance, Etc....................................................    21
            7.03  No Responsibility for Recitals, Etc......................................    21
            7.04  Right to Indemnity.......................................................    21
            7.05  Action on Instructions of Banks..........................................    21
            7.06  Employment of Agents.....................................................    21
            7.07  Reliance on Documents....................................................    21
            7.08  Rights as a Bank.........................................................    22
            7.09  Non-Reliance on Agent or other Banks.....................................    22
            7.10  Events of Default........................................................    22
            7.11  Successor Agent..........................................................    22

                                          ARTICLE VIII
                                          MISCELLANEOUS
SECTION     8.01  Modifications, Consents and Waivers......................................    22
            8.02  Confidentiality..........................................................    23
            8.03  Addresses for Notices....................................................    23
            8.04  Costs, Expenses and Taxes................................................    23
            8.05  Binding Effect and Assignment............................................    23
            8.06  Termination and Substitution of Bank.....................................    23
            8.07  Governing Law............................................................    24
            8.08  Headings.................................................................    24
            8.09  Execution in Counterparts................................................    24
EXHIBIT A         Form of Note.............................................................    26
</TABLE>
 
                                       ii
<PAGE>   4
 
                           REVOLVING CREDIT AGREEMENT
 
                            DATED AS OF MAY 24, 1994
 
     ANADARKO PETROLEUM CORPORATION, a Delaware corporation (the "Company"), the
Banks listed under "Commitment" in Section 1.01 (individually a "Bank" and
collectively the "Banks") and Chemical Bank, as Agent, do hereby agree as
follows:
 
                                   ARTICLE I
 
                        DEFINITIONS AND ACCOUNTING TERMS
 
     SECTION 1.01. Defined Terms. As used in this Agreement, and unless the
context otherwise requires, the following terms shall have the meanings set out
respectively after each:
 
          "Adjusted CD Rate" -- With respect to any Interest Period for a CD
     Rated Loan, the sum of (a) the quotient (rounded upwards, if necessary, to
     the next higher 1/100 of 1%) obtained by dividing the CD Rate by 1.00 minus
     the Reserve Percentage and (b) the Assessment Rate. The Adjusted CD Rate
     shall be adjusted automatically on and as of the effective date of any
     change in the Reserve Percentage.
 
          "Agent" -- Chemical Bank or its successor appointed pursuant to
     Section 7.11.
 
          "Agreement" -- This Revolving Credit Agreement, as the same may be
     amended, modified, supplemented or restated from time to time in accordance
     with the terms hereof.
 
          "Assessment Rate" -- With respect to any Interest Period for a CD
     Rated Loan, the net annual assessment rate actually paid by Chemical to the
     Federal Deposit Insurance Corporation (or any successor) for insurance by
     such corporation (or such successor) of time deposits made in dollars at
     offices of Chemical in the United States during the most recent period for
     which such rate has been determined prior to the commencement of such
     Interest Period.
 
          "Attributable Debt" -- Any particular sale and leaseback transaction
     under which the Company or any subsidiary is at the time liable, at any
     date as of which the amount thereof is to be determined (a) in the case of
     any such transaction involving a capital lease, the amount on such date
     capitalized thereunder, or (b) in the case of any other sale and leaseback
     transaction, the then present value of the minimum rental obligations under
     such sale and leaseback transaction during the remaining term thereof
     (after giving effect to any extensions at the option of the lessor)
     computed by discounting the respective rental payments at the actual
     interest factor included in such payments or, if such interest factor
     cannot be readily determined, at the rate of 10% per annum. The amount of
     any rental payment required to be made under any such sale and leaseback
     transaction not involving a capital lease may exclude amounts required to
     be paid by the lessee on account of maintenance and repairs, insurance,
     taxes, assessments, utilities, operating and labor costs and similar
     charges.
 
          "Available Borrowing Base" -- At any time, the amount equal to the
     difference obtained by subtracting from the Borrowing Base then in effect
     the aggregate principal amount of all the outstanding Indebtedness of the
     Company and its subsidiaries (including, without limitation, any then
     outstanding Loans).
 
          "Borrowing Base" -- At any time, the amount calculated by the
     Determining Banks and approved by the Majority Banks as the Borrowing Base
     and then in effect pursuant to Section 2.16; provided however, that from
     the date hereof until such time as the Borrowing Base is so calculated and
     approved and in effect, the Borrowing Base shall be $1,100,000,000.
 
          "Borrowing Date" -- Each Working Day or Business Day, as the case may
     be, specified in a notice pursuant to Section 2.03 as a date on which the
     Company requests (or is deemed to have requested) the Banks to make Loans.
 
                                        1
<PAGE>   5
 
          "Business Day" -- A day which in the City of New York is not a day on
     which banks are generally authorized or obligated by law to close.
 
          "CD Rate" -- With respect to any Interest Period for a CD Rated Loan,
     the average rate per annum bid at 10:00 A.M. (New York City time), or as
     soon thereafter as practicable, on the first day of such Interest Period by
     New York certificate of deposit dealers of recognized standing for the
     purchase at face value from the Reference Banks of their certificates of
     deposit in an amount comparable to the portion of the CD Rated Loans of
     Chemical to which such Interest Period applies and having a maturity
     comparable to such Interest Period.
 
          "CD Rated Loans" -- Loans hereunder at such time as they bear interest
     at a rate based upon the Adjusted CD Rate.
 
          "Change in Control" -- (a) The acquisition by any Person or two or
     more Persons acting in concert of beneficial ownership (within the meaning
     of Rule 13d-3 of the Commission) of 50% or more of the outstanding shares
     of voting stock of the Company unless the Board of Directors of the Company
     shall have publicly announced its support for such acquisition or (b) a
     majority of the members of the Board of Directors of the Company on any
     date shall not have been (i) members of the Board of Directors of the
     Company on the date 12 months prior to such date or (ii) approved by
     Persons who constitute at least a majority of the members of the Board of
     Directors of the Company as constituted on the date 12 months prior to such
     date.
 
          "Chemical" -- Chemical Bank.
 
          "Commission" -- The Securities and Exchange Commission, as from time
     to time constituted, created under the Securities Exchange Act of 1934, or,
     if at any time after the execution of this Agreement such Commission is not
     existing and performing the duties now assigned to it, then the body
     performing such duties at such time.
 
          "Commitment" -- As to each Bank, its obligation to make Loans to the
     Company pursuant to Section 2.01 in the amount set forth opposite its name
     below, as such obligation may be reduced pursuant to this Agreement:
 
<TABLE>
<CAPTION>
                                                                                PERCENTAGE
                                                                AMOUNT OF           OF
                                  BANK                         COMMITMENT       COMMITMENT
                                  ----                         -----------      ----------
            <S>                                                <C>               <C>
            Chemical Bank...................................   $ 30,000,000        12.0%
            The Chase Manhattan Bank, National
              Association...................................     25,000,000        10.0
            Morgan Guaranty Trust Company of New York.......     25,000,000        10.0
            The Bank of New York............................     21,250,000         8.5
            Continental Bank N.A............................     21,250,000         8.5
            Credit Suisse...................................     21,250,000         8.5
            Mellon Bank, N.A................................     21,250,000         8.5
            Bank of America National Trust and Savings
              Association...................................     21,250,000         8.5
            Credit Lyonnais Cayman Island Branch............     21,250,000         8.5
            The First National Bank of Chicago..............     21,250,000         8.5
            NationsBank of Texas, N.A.......................     21,250,000         8.5
                      Total.................................   $250,000,000      100.0%
                                                               ============      =====
</TABLE>
 
          "Consolidated Stockholders' Equity" -- The par or stated value of the
     stock of the Company plus paid-in capital plus retained earnings, all as
     shown on the consolidated balance sheet of the Company and its subsidiaries
     prepared in accordance with generally accepted accounting principles, as
     such principles are in effect on the date of this Agreement.
 
          "Credit Agreement" -- The Revolving Credit Agreement, dated as of
     February 15, 1992, among the Company, the banks named therein and
     Manufacturers Hanover Trust Company, as agent.
 
                                        2
<PAGE>   6
 
          "Defaulting Bank" -- Any Bank that shall (i) fail to make any Loan
     required to be made by it hereunder, (ii) state in writing that it will not
     make, or that it has disaffirmed or repudiated its obligation to make, any
     Loan required to be made by it hereunder, by reason of the provisions of
     the Financial Institution Reform, Recovery and Enforcement Act of 1989 or
     otherwise or (iii) assign or transfer all or a part of its rights hereunder
     without the prior written consent of the Company.
 
          "Determining Banks" -- Chemical, Morgan Guaranty Trust Company of New
     York and The Chase Manhattan Bank, National Association.
 
          "Domestic Lending Office" -- Initially, the office of a Bank
     designated as such and set forth with its signature below, and thereafter
     such other office of such Bank, if any, of which such Bank shall notify the
     Agent and Company in writing.
 
          "Domestic Loans" -- All Reference Rated Loans and CD Rated Loans.
 
          "Effective Date" -- May 24, 1994, or such other date as the parties
     hereafter shall agree upon.
 
          "Engineer's Opinion" -- A report prepared as of January 1 of the year
     in which the report is delivered which shall, as of such January 1, and on
     the basis of findings and data as of a date not more than four months prior
     to such January 1, identify the properties covered thereby and set forth as
     of such January 1: (a) the Proved Reserves attributable to such properties,
     (b) projections of the future rate of production, the future net revenues
     and the present value of future net revenues of production discounted at a
     rate per annum designated by the Determining Banks, (c) projections of
     reserves and the future rate of production of gas plant products, the
     future net income from gas plant interests and the present value of the
     future net income from the gas plant interests discounted at a rate per
     annum designated by the Determining Banks, and (d) the price assumptions,
     which shall be designated by the Determining Banks, used in arriving at the
     value of future net revenues and future net income.
 
          "Eurodollar Lending Office" -- Initially, the office of a Bank
     designated as such and set forth with its signature below, and thereafter
     such other office of such Bank, if any, of which such Bank shall notify the
     Agent and the Company in writing.
 
          "Eurodollar Loans" -- Loans hereunder at such time as they bear
     interest at a rate based upon the Eurodollar Rate.
 
          "Eurodollar Rate" -- With respect to any Interest Period pertaining to
     a Eurodollar Loan, the quotient obtained by dividing (a) the applicable
     Interbank Rate by (b) 1.00 minus that percentage (expressed as a decimal)
     which is prescribed by the Board of Governors of the Federal Reserve System
     (or any successor) for determining the reserve requirement for a member
     bank of the Federal Reserve System in New York City with deposits exceeding
     $1,000,000,000 in respect of Eurocurrency liabilities having a maturity
     comparable to such Interest Period and in an amount comparable to that
     portion of the Eurodollar Loans of Chemical to which such Interest Period
     applies (such Eurodollar Rate to be adjusted to the next higher 1/100 of
     1%). The percentage referred to in clause (b) of the immediately preceding
     sentence shall be adjusted automatically on and as of the effective date of
     any change in the reserve requirement referred to in such clause (b).
 
          "Event of Default" -- Any of the events of default set forth in
     Article VI.
 
          "Hydrocarbons" -- Oil, gas and other liquid or gaseous hydrocarbons.
 
          "Indebtedness" -- Any indebtedness which: is for money borrowed;
     represents the deferred purchase price of property or assets purchased,
     except trade accounts payable in the ordinary course of business; is in
     respect of a capitalized lease, an advance payment or production payment;
     or is in respect of a guarantee of any of the foregoing obligations of
     another Person.
 
          "Independent Engineer" -- A Person appointed by the Board of Directors
     of the Company and acceptable to the Determining Banks who is engaged in
     engineering work or business who is in fact independent and does not have
     any substantial interest, direct or indirect, in the Company, but such
     Person may be regularly retained by the Company. If such Person is an
     individual, he shall not be a
 
                                        3
<PAGE>   7
 
         director, officer or employee of the Company. If such Person is a
         partnership or a corporation, it shall not have a partner, director or
         officer who is a director, officer or employee of the Company.
 
          "Interbank Rate" -- The average offered rate quoted to the Reference
     Banks in the London Interbank Eurodollar Market as of 10:00 A.M. (New York
     City time) two Working Days immediately preceding the commencement of the
     Interest Period for a Eurodollar Loan for deposits in United States dollars
     in an amount comparable to the Eurodollar Loan of Chemical to which such
     Interest Period applies and for a period of time comparable to such
     Interest Period.
 
          "Interest Payment Date" -- (a) As to any Reference Rated Loan, the end
     of any quarter with respect thereto and the Termination Date, (b) as to any
     Eurodollar Loan, the last day of the Interest Period with respect thereto,
     and, for Interest Periods longer than 3 months, each date which is 3
     months, or a whole multiple thereof, from the first day of such Interest
     Period and (c) as to any CD Rated Loan, the last day of the Interest Period
     with respect thereto, and, for Interest Periods of 180 days, the date which
     is 90 days from the first day of such Interest Period.
 
          "Interest Period" -- (a) With respect to any Eurodollar Loan:
 
             (i) initially, the period commencing on the Borrowing Date or
        conversion date, as the case may be, with respect to such Eurodollar
        Loan and ending 1, 2, 3, 6 or, to the extent funds are available, as
        determined by the Agent, 9 or 12 months thereafter, as selected by the
        Company in its notice of borrowing or notice of conversion, as the case
        may be, given with respect thereto; and
 
             (ii) thereafter, each period commencing on the last day of the next
        preceding Interest Period applicable to such Eurodollar Loan and ending
        1, 2, 3, 6 or, to the extent funds are available, as determined by the
        Agent, 9 or 12 months thereafter, as selected by the Company by
        irrevocable notice to the Agent not less than two Working Days prior to
        the last day of the then current Interest Period with respect thereto;
        and
 
          (b) with respect to any CD Rated Loan:
 
             (i) initially, the period commencing on the Borrowing Date or
        conversion date, as the case may be, with respect to such CD Rated Loan
        and ending 30, 60, 90 or 180 days thereafter, as selected by the Company
        in its notice of borrowing or notice of conversion, as the case may be,
        given with respect thereto; and
 
             (ii) thereafter, each period commencing on the last day of the next
        preceding Interest Period applicable to such CD Rated Loan and ending
        30, 60, 90 or 180 days thereafter, as selected by the Company by
        irrevocable notice to the Agent on the last day of the then current
        Interest Period with respect thereto;
 
     provided that, the foregoing provisions relating to Interest Periods are
     subject to the following:
 
             (A) the Company shall have no right to elect an Interest Period
        which would extend beyond the Termination Date;
 
             (B) if any Interest Period pertaining to a Eurodollar Loan would
        otherwise end on a day which is not a Working Day, that Interest Period
        shall be extended to the next succeeding Working Day unless the result
        of such extension would be to carry such Interest Period into another
        calendar month in which event such Interest Period shall end on the
        immediately preceding Working Day;
 
             (C) if any Interest Period pertaining to a CD Rated Loan would
        otherwise end on a day which is not a Business Day, such Interest Period
        shall be extended to the next succeeding Business Day;
 
             (D) any Interest Period pertaining to a Eurodollar Loan that begins
        on the last Working Day of a calendar month (or on a day for which there
        is no numerically corresponding day in the calendar month at the end of
        such Interest Period) shall end on the last Working Day of a calendar
        month;
 
                                        4
<PAGE>   8
 
             (E) if any Interest Period would otherwise extend beyond the (i)
        Termination Date or (ii) date an amount or amounts are required to be
        repaid pursuant to Section 2.07, then (1) the Interest Period for the
        principal amount (if any) of each Loan required to be repaid on such
        date shall end on such date and (2) the remainder (if any) of each such
        Loan shall have an Interest Period determined as set forth above; and
 
             (F) for purposes of determining the availability of 9 or 12-month
        Interest Periods in respect of Eurodollar Loans, such Interest Periods
        shall be deemed available if (1) each of the Reference Banks quotes a
        rate to the Agent as provided in the definition of Eurodollar Rate and
        (2) the Majority Banks shall not have advised the Agent that the
        Eurodollar Rate determined by the Agent on the basis of such quotes will
        not adequately and fairly reflect the cost to such Banks of maintaining
        or funding their Eurodollar Loans for such Interest Period.
 
          "Lien" -- Any mortgage, pledge, security interest, encumbrance, lien
     or charge of any kind, including, without limitation, any conditional sale
     or other title retention agreement, any lease in the nature thereof and the
     filing of or agreement to give any financing statement under the Uniform
     Commercial Code of any jurisdiction and, in the case of any production
     payment, the right, title and interest of the owner of such production
     payment in the Mineral Interests out of the production from which such
     production payment is payable.
 
          "Loan" -- As the context may require, any CD Rated Loan, Eurodollar
     Loan or Reference Rated Loan.
 
          "Majority Banks" -- At any time, Banks holding at least 66 2/3% of the
     then aggregate unpaid principal amount of the Notes held by Banks or, if no
     such principal amount is then outstanding, Banks having at least 66 2/3% of
     the Commitments; provided, however, that the term Majority Banks as used in
     Section 2.16 shall mean, at any time, Banks holding at least 75% of the
     then aggregate unpaid principal amount of the Notes held by Banks or, if no
     such principal amount is then outstanding, Banks having at least 75% of the
     Commitments.
 
          "Mineral Interests" -- Leasehold and other interests in or under oil,
     gas and other mineral leases, mineral fee interests, overriding royalty and
     royalty interests and any other interests in Hydrocarbons and other
     minerals in place.
 
          "Moodys" -- Moody's Investors Service, Inc.
 
          "Net Proceeds" -- (a) The gross fair market value of the consideration
     or other amounts payable to or receivable by the Company in respect of any
     sales, transfers, distributions (other than cash dividends) or other
     dispositions of assets or properties other than (i) in the ordinary course
     of business, (ii) from the Company to a wholly owned subsidiary or (iii)
     from a subsidiary of the Company to the Company or a wholly owned
     subsidiary, less (b) the amount, if any, of all foreign and domestic taxes
     (but including income taxes only to the extent the Company reasonably
     estimates that such income taxes will be paid as a result of the federal
     income tax return or any state income tax return filed by the Company for
     the year in which the transaction takes place), and reasonable and
     customary fees, commissions, costs and other expenses which are incurred in
     connection with such sales, transfers or other dispositions and are payable
     by the seller or the transferor of the assets or property to which such
     sales, transfers or other dispositions relate, but only to the extent not
     already deducted in arriving at the amount referred to in clause (a).
 
          "Note" -- Any of the promissory notes of the Company payable to the
     order of any Bank in substantially the form attached hereto as Exhibit A.
 
          "Other Credit Agreement" -- means the $150,000,000 364-Day Credit
     Agreement, dated as of the date hereof, among the Company, the banks listed
     therein and Chemical, as agent for such banks, as the same may be amended,
     modified, supplemented or restated, from time to time, in accordance with
     the terms thereof.
 
                                        5
<PAGE>   9
 
          "Person" -- Any individual, corporation, partnership, joint venture,
     association, joint-stock company, trust, unincorporated organization or
     government or any agency or political subdivision thereof.
 
          "Proved Reserves" -- The estimated quantities of Hydrocarbons which
     geological and engineering data demonstrate with reasonable certainty to be
     recoverable in future years from known reservoirs under existing economic
     and operating conditions.
 
          "Public Indenture" -- The Indenture, dated as of May 10, 1988, between
     the Company and Continental Illinois National Bank and Trust Company of
     Chicago (now known as Continental Bank N.A.), as Trustee, as amended by the
     First Supplemental Indenture, dated as of November 15, 1991, between the
     Company and Continental Bank N.A.
 
          "Reference Banks" -- Chemical and Mellon Bank, N.A.
 
          "Reference Rate" -- The rate of interest publicly announced by
     Chemical from time to time in the City of New York as its reference rate.
     The reference rate is not intended to be the lowest rate of interest
     charged by Chemical in connection with extensions of credit to debtors.
 
          "Reference Rated Loans" -- Loans hereunder at such time as they bear
     interest at a rate based upon the Reference Rate.
 
          "Reserve Percentage" -- For any day during any Interest Period
     pertaining to a CD Rated Loan, that percentage (expressed as a decimal)
     which is in effect on such day, as prescribed by the Board of Governors of
     the Federal Reserve System (or any successor) for determining the reserve
     requirement for a member bank of the Federal Reserve System in the City of
     New York with deposits exceeding $1,000,000,000 in respect of new
     non-personal time deposits in dollars in the City of New York having a
     maturity comparable to the portion of the CD Rated Loans to which such
     Interest Period applies and in an amount of $100,000 or more.
 
          "S&P" -- Standard & Poor's Corporation.
 
          "Termination Date" -- June 30, 1999.
 
          "Tranche" -- The collective reference to Loans (other than Reference
     Rated Loans) of the same Type the then current Interest Periods with
     respect to all of which begin on the same date and end on the same later
     date (whether or not such Loans shall originally have been made on the same
     day).
 
          "Type" -- As to any Loan, its nature as a Reference Rated Loan, a CD
     Rated Loan or a Eurodollar Loan.
 
          "Working Day" -- A day on which banks are open for business in the
     City of New York and in London and dealings are carried out in the London
     Interbank Eurodollar Market.
 
     SECTION 1.02. Use of Defined Terms. Any defined term used in the plural
preceded by the definite article shall be taken to encompass all members of the
relevant class. Any defined term used in the singular preceded by "any" shall be
taken to indicate any number of the members of the relevant class.
 
     SECTION 1.03. Accounting Terms. All accounting terms not specifically
defined herein shall be construed in each case in accordance with generally
accepted accounting principles as in effect on the date of this Agreement.
 
                                   ARTICLE II
 
                           AMOUNT AND TERMS OF LOANS
 
     SECTION 2.01. Loans. (a) Subject to the terms and conditions of this
Agreement, each Bank severally agrees to make revolving credit Loans to the
Company from time to time during the period from the Effective Date to, but not
including, the Termination Date in an aggregate principal amount at any one time
outstanding not to exceed its Commitment. The Company may use the Commitments by
borrowing, repaying and
 
                                        6
<PAGE>   10
 
prepaying the Loans in whole or in part, and reborrowing, all in accordance with
the terms and conditions hereof.
 
     (b) The Loans may be (i) Eurodollar Loans, (ii) Reference Rated Loans,
(iii) CD Rated Loans or (iv) a combination thereof, as determined by the Company
and notified to the Agent in accordance with Sections 2.03 and 2.22. Eurodollar
Loans shall be made and maintained by each Bank at either a Eurodollar Lending
Office or a Domestic Lending Office, at its option.
 
     SECTION 2.02. Notes. (a) Loans made by each Bank pursuant hereto shall be
evidenced by an appropriate Note, payable to the order of such Bank and
representing the obligation of the Company to pay the amount of the Commitment
of such Bank or, if less, the aggregate unpaid principal amount of all Loans
made by such Bank, with interest thereon as prescribed in Section 2.09. Each
Note shall (i) be dated the Effective Date, (ii) mature on the Termination Date
and (iii) bear interest for the period from the date thereof until paid in full
on the unpaid principal amount thereof from time to time outstanding at the
applicable interest rate per annum determined as provided in Section 2.09 and
payable as specified in Section 2.09(e). Each Bank is hereby authorized to
record the date, Type and amount of each Loan made by such Bank pursuant to
Section 2.01, each continuation thereof, each conversion of all or a portion
thereof to another Type, and the date and amount of each repayment or prepayment
of principal thereof on the schedule annexed to and constituting a part of its
Note, and any such recordation shall constitute prima facie evidence of the
accuracy of the information so recorded.
 
     (b) Each Bank shall, at the request of the Company, deliver to the Company
copies of the Notes and the schedules annexed thereto.
 
     SECTION 2.03. Procedure for Borrowing. The Company may borrow on any
Working Day if the borrowing (or any portion thereof) consists of Eurodollar
Loans or on any Business Day if the borrowing consists entirely of Domestic
Loans; provided that the Company shall give the Agent notice not later than (i)
two Working Days prior to the Borrowing Date, in the case of Eurodollar Loans,
and (ii) the Borrowing Date, in the case of Domestic Loans. Such notice shall
specify (i) the amount to be borrowed, (ii) the Borrowing Date, (iii) whether
the borrowing is to consist of Eurodollar Loans, Reference Rated Loans, CD Rated
Loans or a combination thereof (in each case stating the amounts requested), and
(iv) except in the case of Reference Rated Loans, the length of the Interest
Period(s) therefor. Each borrowing shall be in an aggregate principal amount not
less than (i) in the case of Reference Rated Loans, the lesser of (A)
$10,000,000 or a whole multiple of $5,000,000 in excess thereof and (B) the then
unused Commitments or (ii) in the case of CD Rated Loans or Eurodollar Loans,
$10,000,000 or a whole multiple of $5,000,000 in excess thereof. Upon receipt of
such notice, the Agent shall promptly notify each Bank thereof. Each Bank will
make the amount of its pro rata share of each borrowing available to the Agent
for the account of the Company at the office of the Agent designated by the
Agent in the Agent's notice aforesaid prior to 11:30 A.M. (according to the time
of the place where such office of the Agent is located) on the Borrowing Date
requested by the Company in funds immediately available to the Agent as the
Agent may direct. The proceeds of each such borrowing will then be made
available to the Company by the Agent crediting the account of the Company on
the books of the Agent with the aggregate amount made available to the Agent by
the Banks and in like funds as received by the Agent.
 
     SECTION 2.04. Commitment Fees. (a) Subject to subsection (b) of this
Section, the Company agrees to pay to the Agent for the account of each Bank a
commitment fee from the Effective Date to, but not including, the Termination
Date or such earlier date upon which the Commitments shall terminate or be
reduced to zero pursuant to Section 2.05 or 6.01, computed at the rate of
18.50/100 of 1% per annum (or, in the case of each day on which the ratings by
Moodys and S&P of the Company's long term senior unsecured debt are (i) in
neither case greater than, but not both less than, "BBB-" or equivalent rating,
23.50/100 of 1% per annum or (ii) both less than "BBB-" or equivalent rating,
31/100 of 1% per annum, provided that for purposes of this Section 2.04(a), in
the event that a rating is not available from either Moodys or S&P, such rating
agency shall be deemed to have assigned its lowest rating) on an amount equal to
the average daily unused portion of the Commitments in effect for the period for
which payment is made.
 
                                        7
<PAGE>   11
 
     (b) If any Bank shall become a Defaulting Bank, then, notwithstanding
subsection (a) above and without prejudicing any right or remedy that the
Company may have with respect to, on account of, arising from or relating to any
event pursuant to which such Bank shall be a Defaulting Bank, no commitment fee
shall accrue for the account of such Bank from and after the date upon which
such Bank shall have become a Defaulting Bank.
 
     (c) Commitment fees shall be payable quarterly in arrears on the last day
of each March, June, September and December, commencing on June 30, 1994, and on
the Termination Date or such earlier date as the Commitments shall terminate or
be reduced to zero as provided herein.
 
     SECTION 2.05. Reduction or Termination of Commitments. (a) The Company
shall have the right, upon not less than two Business Days' notice to the Agent,
to terminate the Commitments or, from time to time, reduce the amount of the
Commitments. Any reduction shall be accompanied by prepayment of the Loans to
the extent, if any, that the Loans then outstanding exceed the amount of the
Commitments as then reduced. Any termination of the Commitments shall be
accompanied by prepayment in full of the Loans then outstanding and the payment
of any unpaid commitment fees then accrued hereunder. Upon receipt of such
notice, the Agent shall promptly notify each Bank thereof. Any reduction shall
be in an amount of $5,000,000 or a whole multiple thereof and shall reduce
permanently the amount of the Commitments then in effect. The Commitments once
terminated or reduced may not be reinstated.
 
     (b) If during any calendar year the Company or its subsidiaries shall
receive Net Proceeds from the sale, transfer, distribution or other disposition
of property identified in the most recent Engineer's Opinion delivered pursuant
to Section 4.01 in an aggregate amount in excess of $50,000,000, the Borrowing
Base shall be reduced by the amount of such excess, each such reduction to occur
on the date of receipt by the Company or its subsidiaries of such excess amount.
 
     SECTION 2.06. Optional Prepayments. (a) The Company may, at its option, as
provided in this Section 2.06, at any time and from time to time prepay the
Loans, in whole or in part, upon at least two Business Days' prior notice to the
Agent, specifying (i) the date and amount of prepayment and (ii) the respective
amounts to be prepaid in respect of Reference Rated Loans, CD Rated Loans and
Eurodollar Loans. Upon receipt of such notice, the Agent shall promptly notify
each Bank thereof. The payment amount specified in such notice shall be due and
payable on the date specified. All prepayments pursuant to this Article II shall
include accrued interest on the amount prepaid to the date of prepayment and, in
the case of prepayments of Eurodollar Loans and CD Rated Loans, any amounts
payable pursuant to Section 2.20. The Loans shall also be subject to prepayment
as provided in Sections 2.05, 2.07, 2.12, 2.13 and 8.06.
 
     (b) Partial optional prepayments pursuant to this Section 2.06 shall be in
an aggregate principal amount of $10,000,000 or any whole multiple of $5,000,000
in excess thereof. All prepayments of Loans pursuant to this Article II shall be
without the payment by the Company of any premium or penalty except for amounts
payable pursuant to Section 2.20.
 
     SECTION 2.07. Mandatory Prepayments. (a) If at any time the aggregate
outstanding principal amount of the Loans exceeds the Commitments, the Company
shall prepay the Loans in an amount equal to such excess.
 
     (b) If at any time the Available Borrowing Base is less than zero, the
Company shall prepay Indebtedness in an amount at least sufficient to cause the
Available Borrowing Base to be equal to zero. If any amount is required to be
prepaid pursuant to this subsection (b) as a result of a decrease in the
Borrowing Base, the Company shall pay such amount in no more than six equal
monthly installments, payable on the fifteenth day of each calendar month,
commencing on the first such day to occur after the date of any determination
that a prepayment is required pursuant to this subsection (b).
 
     (c) Each prepayment of Loans pursuant to this Section 2.07 shall be
accompanied by payment of accrued interest on the amount prepaid to the date of
prepayment and, in the case of prepayments of Eurodollar Loans and CD Rated
Loans, any amounts payable pursuant to Section 2.20.
 
                                        8
<PAGE>   12
 
     SECTION 2.08. Repayment of Loans. The Company shall pay to the Agent for
the account of each Bank the unpaid principal amount of each Loan made by such
Bank on the Termination Date.
 
     SECTION 2.09. Interest Rate. (a) Each Eurodollar Loan shall bear interest
for each day during each Interest Period with respect thereto on the unpaid
principal amount thereof at a rate per annum equal to the Eurodollar Rate for
such Interest Period plus 37.50/100 of 1%.
 
     (b) Each Reference Rated Loan shall bear interest on the unpaid principal
amount thereof at a fluctuating rate per annum equal to the Reference Rate.
 
     (c) Each CD Rated Loan shall bear interest for each day during each
Interest Period with respect thereto on the unpaid principal amount thereof at a
rate per annum equal to the Adjusted CD Rate for such Interest Period plus
50/100 of 1%.
 
     (d) Any overdue principal of any Loan shall, without limiting the rights of
any Bank under Article VI, bear interest at a rate per annum which is 1% above
the rate which would otherwise be applicable to such Loan pursuant to
subsections (a), (b) and (c) of this Section 2.09 until paid in full (as well
after as before judgment).
 
     (e) Interest shall be payable on each Interest Payment Date.
 
     (f) Notwithstanding the foregoing, if on any day the sum of (i) the
aggregate principal amount of outstanding Loans and (ii) the aggregate principal
amount of loans outstanding under the Other Credit Agreement is greater than 50%
of the sum of (A) the aggregate Commitments hereunder and (B) the aggregate
commitments then existing under the Other Credit Agreement, each Eurodollar Loan
and CD Rated Loan shall bear interest, for such day, at a rate per annum which
is 12.50/100 of 1% above the rate which would otherwise be applicable pursuant
to subsections (a) and (c) of this Section 2.09.
 
     (g) Notwithstanding the foregoing, (i) if on any day neither of the ratings
by Moodys and S&P of the Company's long term senior unsecured debt is greater
than "BBB-" or equivalent rating, but such ratings are not both less than "BBB-"
or equivalent rating, Eurodollar and CD Rated Loans shall bear interest, for
such day, at a rate per annum which is 12.50/100 of 1% above the rate which
would otherwise be applicable pursuant to subsections (a), (c) and (f) of this
Section 2.09; or (ii) if on any day Moodys and S&P both rate the Company's long
term senior debt less than "BBB-" or equivalent rating, Eurodollar and CD Rated
Loans shall bear interest, for such day, at a rate per annum which is 25/100 of
1% above the rate which would otherwise be applicable pursuant to subsections
(a), (c) and (f) of this Section 2.09. For purposes of this Section 2.09, in the
event a rating is not available from either Moodys or S&P, such rating agency
will be deemed to have assigned its lowest rating.
 
     SECTION 2.10. Computation of Interest and Fees. (a) Interest on the
Reference Rated Loans and commitment fees shall be calculated on the basis of a
365-(or 366-as the case may be) day year for the actual days elapsed. Interest
on Eurodollar Loans and CD Rated Loans shall be calculated on the basis of a
360-day year for the actual days elapsed. The Agent shall notify the Company and
the Banks of each determination of a Eurodollar Rate and of an Adjusted CD Rate.
Any change in the interest rate resulting from a change in the Reference Rate
shall become effective as of the opening of business on the day on which such
change in the Reference Rate shall become effective. The Agent shall notify the
Company and the Banks of the effective date and the amount of each such change
in the Reference Rate.
 
     (b) The Agent shall, at the request of the Company, deliver to the Company
a statement showing the quotations given by the Reference Banks and the
computations used by the Agent in determining any interest rate pursuant to
subsection (a) or (c) of this Section 2.10.
 
     (c) If either of the Reference Banks shall be unable or shall otherwise
fail to notify the Agent of a rate, the interest rate shall be determined on the
basis of the rate notified by the other Reference Bank.
 
     SECTION 2.11. Pro Rata Treatment and Payments. Each borrowing by the
Company from the Banks, each payment (including each prepayment) by the Company
on account of the principal of and interest on the Loans and on account of any
commitment fees hereunder and any reduction of the Commitments of the
 
                                        9
<PAGE>   13
 
Banks hereunder shall be made pro rata according to the Commitments, except that
(i) payments or prepayments, and offsets against or reductions from the amount
of payments and prepayments, in each case, specifically for the account of a
particular Bank under the terms of Section 2.04, 2.12, 2.13, 2.20 or 8.06 shall
be made for the account of such Bank and (ii) if any Bank shall become a
Defaulting Bank, from and after the date upon which such Bank shall have become
a Defaulting Bank, any payment made on account of principal of or interest on
the Loans shall be applied, first for the account of the Banks other than the
Defaulting Bank, pro rata according to the Commitments of such Banks, until the
principal of and interest on the Loans of such Banks shall have been paid in
full and, second for the account of such Defaulting Bank, provided that the
application of such payments in accordance with this clause (ii) shall not
constitute an Event of Default or an event which with the giving of notice or
the passage of time, or both, would constitute an Event of Default, and no
payment of principal of or interest on the Loans of such Defaulting Bank shall
be considered to be overdue for purposes of Section 2.09(d) hereof, if, had such
payments been applied without regard to this clause (ii), no such Event of
Default or event which with the giving of notice or the passage of time, or
both, would constitute an Event of Default would have occurred and no such
payment of principal of or interest on the Loans of such Defaulting Bank would
have been overdue. All payments (including prepayments) to be made by the
Company on account of principal, interest and commitment fees shall be made
without setoff or counterclaim and shall be made to the Agent on behalf of the
Banks at the Agent's office located at (a) 270 Park Avenue, New York, New York
10017 at or before 12:00 noon (New York City time) in the case of Domestic Loans
and commitment fees, for the account of the Domestic Lending Offices of the
Banks and (b) 4 New York Plaza, New York, New York 10015 at or before 12:00 noon
(New York City time) in the case of Eurodollar Loans, for the account of the
Eurodollar Lending Offices or Domestic Lending Offices, as the case may be, of
the Banks which shall then be maintaining Eurodollar Loans, in each case in
lawful money of the United States of America and in immediately available funds.
The Agent shall distribute such payments to the Banks promptly upon receipt in
like funds as received.
 
     If any payment hereunder (other than payments on the Eurodollar Loans)
becomes due and payable on a day other than a Business Day, such payment shall
be extended to the next succeeding Business Day, and with respect to payments of
principal, interest thereon shall be payable at the then applicable rate during
such extension. If any payment on a Eurodollar Loan becomes due and payable on a
day other than a Working Day, the maturity thereof shall be extended to the next
succeeding Working Day unless the result of such extension would be to extend
such payment into another calendar month in which event such payment shall be
made on the immediately preceding Working Day. Each Bank is authorized to and
shall endorse the date, Type and amount of each Loan made by such Bank, each
continuation thereof, each conversion of all or a portion thereof to another
Type, and the date and amount of each payment of principal with respect thereto
on the schedule annexed to and constituting a part of its Note. No failure to
make or error in making any such endorsement as authorized hereby shall affect
the validity of the obligations of the Company to repay the unpaid principal
amount of the Loans with interest thereon as provided in Section 2.09 or the
validity of any payment thereof made by the Company.
 
     Except as provided in Sections 2.04(b), 2.12, 2.13, 2.20, 8.06 and this
Section 2.11, if the holder of any Note shall obtain any payment (whether
voluntary, involuntary, by application of offset or otherwise) upon principal of
or interest on such Note in excess of its pro rata share of payments obtained by
all holders upon principal of and interest on such Notes then held by them, such
holder shall purchase from the other holders such participation in such Notes
held by them as shall be necessary to cause such purchasing holder to share the
excess payment ratably with each of them; providing however, that if all or any
portion of the excess payment is thereafter recovered from such purchasing
holder, the purchase shall be rescinded and the purchase price restored to the
extent of such recovery, but without interest.
 
     The following subsection (a) of Section 2.12 and subsection (b) of Section
2.15 shall be applicable to Eurodollar Loans and CD Rated Loans only and the
following Section 2.13 and subsection (a) of Section 2.15 shall be applicable to
Eurodollar Loans only.
 
     SECTION 2.12. Increased Cost of Loans. (a) In the event of any change in
any applicable law, treaty or governmental regulation after the date of this
Agreement, or in the interpretation or application thereof after the date of
this Agreement, or compliance by any Bank with any request or directive (whether
or not having
 
                                       10
<PAGE>   14
 
the force of law) from any central bank or other governmental authority made or
issued after the date of this Agreement, which:
 
          (i) does or shall subject such Bank to any tax of any kind whatsoever
     (including, without limitation, withholding taxes) with respect to this
     Agreement, any Note or any Eurodollar or CD Rated Loan, or change the basis
     of taxation of payments to such Bank of principal, commitment fees, penalty
     fees, interest or any other amount payable hereunder (except for changes in
     the rate of tax on the overall net income of such Bank);
 
          (ii) does or shall impose, modify or hold applicable any reserve,
     special deposit, compulsory loan or similar requirement against assets held
     by, or deposits or other liabilities in or for the account of, advances or
     loans by, or other credit extended by, or any other acquisition of funds
     by, any office of such Bank (in excess, and without duplication, of those
     taken into account in computing the Eurodollar Rate for any Eurodollar
     Interest Period, the Reserve Percentage and the Assessment Rate); or
 
          (iii) does or shall impose on such Bank any other condition;
 
and the result of any of the foregoing is to increase the cost to such Bank of
making, converting into, continuing or maintaining Eurodollar Loans or CD Rated
Loans or to reduce any amount receivable hereunder with respect to Eurodollar
Loans or CD Rated Loans, then, in any such case, the Company shall pay such
Bank, upon written demand being made to the Company by such Bank, such
additional amount which will compensate such Bank for such amounts as that Bank
reasonably deems to be material with respect to this Agreement, the Notes or the
Loans hereunder, provided, however, that if all or any such additional cost
would not have been payable, or such reduction would not have occurred, but for
such Bank's decision to designate a new Eurodollar Lending Office or refusal to
change to another Eurodollar Lending Office as provided below, the Company shall
have no obligation under this Section 2.12 to compensate such Bank for such
amount. Such demand shall be accompanied by a certificate of a duly authorized
officer of such Bank setting forth the amount of such payment and the basis
therefor, which certificate shall be prima facie evidence of the amount of such
payment. Each Bank shall also give written notice to the Company and the Agent
of any event occurring after the date of this Agreement which would entitle such
Bank to compensation pursuant to this Section 2.12 as promptly as practicable
after it obtains knowledge thereof and determines to request such compensation
and will designate a different Eurodollar Lending Office if such designation
will avoid the need for, or reduce the amount of, such compensation and will
not, in the sole opinion of such Bank, be disadvantageous to such Bank.
Notwithstanding the foregoing, in the event that any Bank shall demand payment
pursuant to this Section 2.12, the Company may, upon at least two Business Days'
notice to the Agent and such Bank, convert in whole (but not in part) the
Eurodollar Loans or CD Rated Loans, as the case may be, of such Bank, into Loans
of another Type without regard to the requirements of Section 2.22 (other than
clause (i) of the proviso to the last sentence of subsection (a) thereof).
 
     (b) In the event that any Bank shall have reasonably determined that the
adoption after the date of this Agreement of any law, rule or regulation
regarding capital adequacy, or any change therein or in the interpretation or
application thereof after the date of this Agreement or compliance by any Bank
with any request or directive regarding capital adequacy (whether or not having
the force of law) from any central bank or governmental authority made or issued
after the date of this Agreement, does or shall have the effect of reducing the
rate of return on such Bank's capital as a consequence of its obligations
hereunder to a level below that which such Bank could have achieved but for such
adoption, change or compliance (taking into consideration such Bank's policies
with respect to capital adequacy) by an amount reasonably deemed by such Bank to
be material, then from time to time, after submission by such Bank to the
Company (with a copy to the Agent) of a written request therefor, the Company
shall pay to such Bank such additional amount or amounts as will compensate such
Bank for such reduction from and after such date the Company receives the
request; provided, however, that the foregoing shall not apply to any capital
adequacy requirement imposed solely by reason of any business combination
effected after the date hereof.
 
     SECTION 2.13. Illegality. Notwithstanding anything herein contained, if any
Bank shall make a good faith determination that a change in any applicable law
or regulation or in the interpretation thereof by any
 
                                       11
<PAGE>   15
 
authority charged with the administration thereof shall make it unlawful for
such Bank to give effect to its obligations to make, convert into, continue or
maintain its Eurodollar Loans under this Agreement, the obligation of such Bank
to make, convert into, continue or maintain Eurodollar Loans hereunder shall be
suspended for the duration of such illegality. Such Bank, by written notice to
the Agent and to the Company, shall declare that such Bank's obligation to make,
convert into, continue and maintain Eurodollar Loans shall be suspended, and the
Company, on the last day of the then current Interest Period applicable to such
Eurodollar Loans or portion thereof or, if the Bank so requests, on such earlier
date as may be required by relevant law, shall convert such Eurodollar Loans or
portion thereof into Loans of another Type, without regard to the requirements
of Section 2.22 (other than clause (i) of the proviso to the last sentence of
subsection (a) thereof). If and when such illegality ceases to exist, such
suspension shall cease and such Bank shall notify the Company and the Agent
thereof and any Loans previously converted from Eurodollar Loans to Loans of a
different Type pursuant to this Section 2.13 shall be converted into Loans of
Types corresponding to the Loans maintained by the other Banks on the last day
of the Interest Period of the corresponding Eurodollar Loans of the other Banks
unless, in the case of a conversion of CD Rated Loans, the Company shall have
elected, by notice to the Agent, not to convert such CD Rated Loans until the
last day of the then current Interest Period with respect thereto, in which
case, such CD Rated Loans shall be converted at such time as the Company may
elect in accordance with Section 2.22.
 
     SECTION 2.14. Withholding Tax Exemption. At least five Business Days prior
to the first date on which interest or fees are payable hereunder for the
account of any Bank, each Bank that is not incorporated under the laws of the
United States of America or a state thereof agrees that it will deliver to each
of the Company and the Agent two duly completed copies of United States Internal
Revenue Service Form 1001 or 4224, certifying in either case that such Bank is
entitled to receive payments under this Agreement and the Notes without
deduction or withholding of any United States federal income taxes. Each Bank
which so delivers a Form 1001 or 4224 further undertakes to deliver to each of
the Company and the Agent two additional copies of such form (or a successor
form) on or before the date that such form expires or becomes obsolete or after
the occurrence of any event requiring a change in the most recent form so
delivered by it, and such amendments thereto or extensions or renewals thereof
as may be reasonably requested by the Company or the Agent, in each case
certifying that such Bank is entitled to receive payments under this Agreement
and the Notes without deduction or withholding of any United States federal
income taxes, unless an event (including without limitation any change in
treaty, law or regulation) has occurred prior to the date on which any such
delivery would otherwise be required which renders all such forms inapplicable
or which would prevent such Bank from duly completing and delivering any such
form with respect to it and such Bank advises the Company and the Agent that it
is not capable of receiving payments without any deduction or withholding of
United States federal income tax.
 
     SECTION 2.15. Substitute Loan Basis. (a) In the event that the Majority
Banks shall reasonably determine (which determination shall be final and
conclusive and binding upon the Company) at any time that (i) by reason of
changes affecting the London Interbank Eurodollar Market, adequate and fair
means do not exist for ascertaining the rate of interest applicable to any
Tranche of Eurodollar Loans for any requested Interest Period or (ii) the making
of, converting into or continuing for an additional Interest Period of any
Tranche of Eurodollar Loans has been made impracticable by the occurrence of a
contingency which materially and adversely affects the London Interbank
Eurodollar Market then, and in any such event, the Agent shall forthwith give
notice to the Company and, subject to the provisions of subsection (b) of this
Section 2.15 (x) unless on the date upon which such Eurodollar Loans were to be
made the Company notifies the Agent that it elects not to borrow on such date,
any Eurodollar Loans requested to be made on the first day of such Interest
Period shall be made as Reference Rated Loans or CD Rated Loans, as requested by
the Company by notice (setting forth, in the case of any request that such Loans
be made as CD Rated Loans, the initial Interest Period with respect thereto) to
the Agent on the date upon which such Loans are to be made, or, in the absence
of any such request, as Reference Rated Loans, (y) any Loans that were to have
been, on the first day of such Interest Period, converted to or continued as
Eurodollar Loans shall be converted to or continued as Reference Rated Loans or
CD Rated Loans, as requested by the Company by notice (setting forth, in the
case of any request that such Loans be converted to or continued as CD Rated
Loans, the next Interest Period with respect thereto) to the Agent on the date
upon which such Loans were to have been
 
                                       12
<PAGE>   16
 
converted or continued, or, in the absence of any such request, as Reference
Rated Loans, and (z) any outstanding Eurodollar Loans shall be converted, on the
last day of the Interest Period applicable thereto, to Reference Rated Loans or
CD Rated Loans, as requested by the Company by notice (setting forth, in the
case of any request that such Loans be converted to CD Rated Loans, the initial
Interest Period with respect thereto) to the Agent on the date upon which such
Loans are to be converted, or in the absence of any such request, to Reference
Rated Loans. The Agent shall give written notice to the Company of any event
occurring after the giving of such notice which permits an adequate and fair
means of ascertaining the rate of interest applicable to Eurodollar Loans and
until such notice by the Agent, no further Eurodollar Loans shall be made or
continued as such, nor shall the Company have the right to convert Loans to
Eurodollar Loans.
 
     (b) In the event that the Majority Banks shall reasonably determine (which
determination shall be final and conclusive and binding upon the Company) at any
time that (i) by reason of changes affecting the market for domestic
certificates of deposit of commercial banks, adequate and fair means do not
exist for ascertaining the rate of interest applicable to any Tranche of CD
Rated Loans for any requested Interest Period or (ii) the making of, converting
into or continuing for an additional Interest Period of any Tranche of CD Rated
Loans has been made impracticable by the occurrence of a contingency which
materially and adversely affects the market for domestic certificates of deposit
of commercial banks then, and in any such event, the Agent shall forthwith give
notice to the Company and, subject to the provisions of subsection (a) of this
Section 2.15 (x) unless on the date upon which such CD Rated Loans were to be
made, the Company notifies the Agent that it elects not to borrow on such date,
any CD Rated Loans requested to be made on the first day of such Interest Period
shall be made as Reference Rated Loans or Eurodollar Loans, as requested by the
Company by notice (setting forth, in the case of any request that such Loans be
made as Eurodollar Loans, the initial Interest Period with respect thereto) to
the Agent on the date of or two Working Days before, as the case may be, such
Loans are to be made, or, in the absence of any such request, as Reference Rated
Loans, (y) any Loans that were to have been, on the first day of such Interest
Period, converted to or continued as CD Rated Loans shall be converted to or
continued as Reference Rated Loans or Eurodollar Loans, as requested by the
Company by notice (setting forth, in the case of any request that such Loans be
converted to or continued as Eurodollar Loans, the next Interest Period with
respect thereto) to the Agent on the date upon or two Working Days before, as
the case may be, such Loans were to have been converted or continued, or, in the
absence of any such request, as Reference Rated Loans and (z) any outstanding CD
Rated Loans shall be converted, on the last day of the Interest Period
applicable thereto, to Reference Rated Loans or Eurodollar Loans, as requested
by the Company by notice (setting forth, in the case of any request that such
Loans be converted to Eurodollar Loans, the initial Interest Period with respect
thereto) to the Agent on the date upon or two Working Days before, as the case
may be, the date upon which such Loans are to be converted, or, in the absence
of any such request, to Reference Rated Loans. The Agent shall give written
notice to the Company of any event occurring after the giving of such notice
which permits an adequate and fair means of ascertaining the rate of interest
applicable to CD Rated Loans and until such notice by the Agent, no further CD
Rated Loans shall be made or continued as such, nor shall the Company have the
right to convert Loans to CD Rated Loans.
 
     SECTION 2.16. Determination of Borrowing Base. On or before the date which
is the later of April 1 in each year and the date which is one month after the
date on which the Engineer's Opinion for such year is delivered to the Banks
pursuant to Section 4.01, the Determining Banks shall determine, based upon the
information, including information as to projected cash flows, contained in such
Engineer's Opinion, the Determining Banks' normal policy guidelines on price
parameters, cost escalations and discount and other factors customarily used by
each Determining Bank in evaluating energy and natural resource related credits,
a borrowing base. The borrowing base as determined shall be promptly
communicated to the other Banks, which shall promptly consider and approve or
disapprove the same, and upon approval of such determination by the Majority
Banks, by notice to the Agent, such borrowing base shall constitute the
"Borrowing Base." Such determination by the Determining Banks and such approval
or nonapproval by the Majority Banks shall be made in the sole and absolute
discretion of the Determining Banks and the Majority Banks, respectively. No
later than May 15 in each year or the date which is six weeks after the date on
which the Engineer's Opinion for such year is delivered to Banks pursuant to
Section 4.01, the Agent shall notify the Company of
 
                                       13
<PAGE>   17
 
the Borrowing Base. If the Agent fails to notify the Company, the Borrowing Base
shall remain in effect until the next succeeding calculation of the Borrowing
Base in the manner provided above.
 
     SECTION 2.17. Certain Prepayments or Conversions Pursuant to Sections 2.12
and 2.13. In the event that Loans of any Bank of one Type are prepaid or
converted into Loans of another Type pursuant to Sections 2.12 or 2.13 (Loans of
the former Type being herein called "Affected Loans"), unless and until such
Bank gives written notice that the circumstances which gave rise to such
prepayment or conversion no longer exist (which such Bank agrees to do promptly
upon such circumstances ceasing to exist) such Bank shall not make further
Affected Loans and all Loans which would otherwise be made by such Bank as, or
converted by such Bank into, Affected Loans shall be made instead as, or
converted into or continued as, Loans of another Type (on which interest and
principal shall be payable simultaneously with the related Affected Loans of the
other Banks).
 
     SECTION 2.18. Certain Notices. Notices by the Company under each of
Sections 2.03, 2.05, 2.06, 2.12, 2.15 and 2.22 and under the definition of
"Interest Period" in Section 1.01 (a) shall be given in writing, by telegraph,
by telecopy or by telephone (confirmed promptly in writing) and (b) shall be
effective only if received by the Agent and, in the case of Section 2.12, the
Bank involved, not later than 10:30 A.M. (New York City time) on the day
specified in the respective Section or definition as the latest day such notice
may be given. Notices by the Company under each of Sections 2.03, 2.05, 2.06,
2.12, 2.15 and 2.22 shall be irrevocable.
 
     SECTION 2.19. Use of Proceeds. The Company agrees that the proceeds of the
Loans obtained by the Company hereunder shall be used for its general corporate
purposes, including the repayment of indebtedness and loans to subsidiaries and
will not be used, directly or indirectly, or for any other purpose which would
result in a violation of any law, rule or regulation, including Regulation U of
the Board of Governors of the Federal Reserve System, known to the Company.
 
     SECTION 2.20. Indemnity. The Company agrees to indemnify each Bank and to
hold such Bank harmless from any loss (other than loss of margin after the date
of such default or prepayment) or expense which such Bank may sustain or incur
as a consequence of (a) default by the Company in making a borrowing of,
conversion into or continuance of a Eurodollar Loan or CD Rated Loan after the
Company has given a notice requesting the same in accordance with this
Agreement, (b) default by the Company in making any prepayment of a Eurodollar
Loan or a CD Rated Loan after the Company has given a notice in accordance with
Section 2.06 or (c) the making by the Company of a prepayment or conversion of a
Eurodollar Loan or a CD Rated Loan on a day which is not the last day of the
Interest Period with respect thereto, arising from the reemployment of funds
obtained by it to maintain its Eurodollar Loans or CD Rated Loans hereunder or
from fees payable to terminate the deposits from which such funds were obtained.
This covenant shall survive termination of this Agreement and payment of the
Notes.
 
     SECTION 2.21. Minimum Amounts of Tranches. All borrowings, conversions and
continuations of Loans hereunder and all selections of Interest Periods
hereunder shall be in such amounts and be made pursuant to such elections so
that, after giving effect thereto, the aggregate principal amount of the Loans
comprising each Tranche shall be equal to $10,000,000 or a whole multiple of
$5,000,000 in excess thereof.
 
     SECTION 2.22. Conversion and Continuation Options. (a) The Company may
elect from time to time to convert Eurodollar Loans or CD Rated Loans to
Reference Rated Loans by giving the Agent irrevocable notice of such election on
the date of such conversion, provided that any such conversion may only be made
on the last day of an Interest Period with respect to the Loans being converted.
The Company may elect from time to time to convert Reference Rated Loans or
Eurodollar Loans to CD Rated Loans by giving the Agent irrevocable notice of
such election on the date of such conversion, provided that any such conversion
of Eurodollar Loans may only be made on the last day of an Interest Period with
respect thereto. The Company may elect from time to time to convert Reference
Rated Loans or CD Rated Loans to Eurodollar Loans by giving the Agent at least
two Working Days irrevocable notice of such election, provided that any such
conversion of CD Rated Loans may only be made on the last day of an Interest
Period with respect thereto. Any such notice of conversion to Eurodollar Loans
or CD Rated Loans shall specify the length of the initial Interest Period or
Interest Periods therefor. Upon receipt of any such notice, the Agent shall
promptly notify
 
                                       14
<PAGE>   18
 
each Bank thereof. All or any part of outstanding Eurodollar Loans, CD Rated
Loans and Reference Rated Loans may be converted as provided herein, provided
that (i) no Loan may be converted into a Eurodollar Loan or a CD Rated Loan at
any time at which an Event of Default has occurred and is continuing and (ii)
any conversion may only be made if, after giving effect thereto, Section 2.21
shall not have been contravened.
 
     (b) Any Eurodollar Loans or CD Rated Loans may be continued as such upon
the expiration of the then current Interest Period with respect thereto by the
Company giving notice to the Agent, in accordance with the applicable provisions
of the term "Interest Period" set forth in Section 1.1, of the length of the
next Interest Period to be applicable to such Loans, provided that (i) no Loan
may be continued as a Eurodollar Loan or a CD Rated Loan for an additional
Interest Period at any time at which an Event of Default has occurred or is
continuing and (ii) no Eurodollar Loan or CD Rated Loan may be continued as such
if, after giving effect thereto, Section 2.21 would be contravened and provided,
further, that if the Company shall fail to give any required notice as described
above in this section, or if such conversion is not permitted pursuant to the
preceding proviso hereof, such Loans shall be automatically converted to
Reference Rated Loans on the last day of such then expiring Interest Period.
 
                                  ARTICLE III
 
                         REPRESENTATIONS AND WARRANTIES
 
     SECTION 3.01. Representations and Warranties by the Company. The Company
represents and warrants to each of the Banks that:
 
          (a) Corporate Existence, Qualification. The Company (i) has been duly
     incorporated and is validly existing and in good standing under the laws of
     the State of Delaware and (ii) is qualified to do business as a foreign
     corporation and is in good standing in each jurisdiction of the United
     States in which the ownership of its properties or the conduct of its
     business requires such qualification and where the failure to so qualify
     would have a material adverse effect upon the business of the Company and
     its subsidiaries taken as a whole.
 
          (b) Corporate Authorization and Binding Agreement. This Agreement has
     been duly authorized, executed and delivered by the Company and constitutes
     a valid and binding agreement of the Company, enforceable in accordance
     with its terms, subject to the effect of applicable bankruptcy, insolvency
     or similar laws affecting creditors' rights generally and equitable
     principles of general applicability. The Notes have been duly authorized by
     the Company and, when executed, issued and delivered pursuant hereto for
     value received, will constitute valid and binding obligations of the
     Company, enforceable in accordance with their terms, except as (i) the
     enforceability thereof may be limited by bankruptcy, insolvency or similar
     laws affecting creditors' rights generally and (ii) rights of acceleration
     and the availability of equitable remedies may be limited by equitable
     principles of general applicability.
 
          (c) No Conflicting Agreements. The execution, delivery and performance
     of this Agreement and the execution, issuance, delivery and performance of
     the Notes will not conflict with any provision of (i) the restated
     certificate of incorporation or by-laws of the Company or (ii) any
     indenture, loan agreement or other similar agreement or instrument binding
     on the Company.
 
          (d) Governmental Approvals. No authorization, consent or approval of
     any governmental body or agency is required for the valid execution,
     delivery and performance of this Agreement by the Company or for the valid
     execution, issuance, delivery and performance of the Notes by the Company.
 
          (e) Proceedings. To the knowledge of the Company, there is no
     proceeding pending or threatened before any court or administrative agency
     which, in the opinion of the Company, will result in a final determination
     which would have the effect of preventing the Company from carrying on its
     business or from meeting its current and anticipated obligations on a
     timely basis.
 
          (f) Financial Position. The consolidated balance sheets of the Company
     and its subsidiaries as of December 31, 1992 and 1993, and the related
     consolidated statements of income, stockholders' equity
 
                                       15
<PAGE>   19
 
         and cash flows for each of the years in the three-year period ended
         December 31, 1993, certified by KPMG Peat Marwick, present fairly the
         consolidated financial position of the Company and its subsidiaries at
         December 31, 1992 and 1993 and the results of their operations and
         their cash flows for each of the years in the three-year period ended
         December 31, 1993, in conformity with generally accepted accounting
         principles applied on a consistent basis. Since December 31, 1993,
         there has been no material adverse change in the consolidated financial
         position or results of operations of the Company and its subsidiaries
         which would have the effect of preventing the Company from carrying on
         its business or from meeting its current and anticipated obligations on
         a timely basis.
 
          (g) Ownership of Property. The Company and each of its subsidiaries
     has valid and defensible title to any of their properties described as
     Proved Reserves in the Engineer's Opinion delivered to the Banks prior to
     the date hereof, or as the case may be, the most recent Engineer's Opinion
     provided pursuant to Section 4.01, free and clear of any Liens except as
     permitted in Section 1005 of the Public Indenture.
 
                                   ARTICLE IV
 
                            COVENANTS OF THE COMPANY
 
     SECTION 4.01. Covenants. The Company covenants and agrees that, from the
date of this Agreement and for so long as any of the Notes shall be outstanding
or any of the Banks shall have any Commitments:
 
          (a) Financial Statements, Etc. The Company will furnish to each Bank:
     (i) 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 Securities Exchange Act of 1934; or, if
     the Company is not required to file information, documents or reports
     pursuant to either of said Sections, then such of the supplementary and
     periodic information, documents and reports which may be required pursuant
     to Section 13 of the Securities Exchange Act of 1934 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; (ii) within 60
     days after the close of each of the first three quarters of each of the
     Company's fiscal years a statement by a responsible officer of the Company
     stating whether to the knowledge of the Company an event has occurred
     during such period and is continuing which constitutes an Event of Default
     or would constitute an Event of Default with the giving of notice or the
     lapse of time, or both, and, if so, stating the facts with respect thereto;
     (iii) within 120 days after the close of each of the Company's fiscal years
     a statement by a responsible officer of the Company stating whether to the
     knowledge of the Company an event has occurred during such period and is
     continuing which constitutes an Event of Default or would constitute an
     Event of Default with the giving of notice or the lapse of time, or both,
     and, if so, stating the facts with respect thereto; (iv) within five
     Business Days after the Company becomes aware of the occurrence of any
     event which constitutes an Event of Default, or would constitute an Event
     of Default with the passage of time or the giving of notice, or both, if
     such occurrence is then continuing, notice of such occurrence together with
     a statement by a responsible officer of the Company stating the facts with
     respect thereto; and (v) such other information respecting the financial
     condition or operations of the Company and its subsidiaries as any Bank may
     from time to time reasonably request.
 
          (b) Engineer's Report. The Company will furnish to each Bank subject
     to Section 8.02, on or before March 1 in each year, an Engineer's Opinion.
     The Engineer's Opinion shall, subject to the proviso below, (i) be
     certified by a responsible officer of the Company as a true, correct and
     complete report containing no material misstatements or misrepresentations
     and (ii) cover 100% of the Proved Reserves of the Company (or such lesser
     amount as may be agreed upon by the Agent and the Determining Banks),
     calculated as of the January 1 preceding such March 1, provided, however,
     that if as of January 1 (i) neither of the ratings by Moodys and S&P of the
     Company's long term senior unsecured debt is greater than "BBB-" or
     equivalent rating, but such ratings are not both less than "BBB-" or
     equivalent rating and upon the written request of the Majority Banks or
     (ii) Moodys and S&P both rate the
 
                                       16
<PAGE>   20
 
         Company's long term senior unsecured debt less than "BBB-" or
         equivalent rating, the Engineer's Opinion shall be issued by an
         Independent Engineer on the greater of (i) each field that represents
         more than 2% of the total Proved Reserves of the Company or (ii) at
         least 50% of the Proved Reserves of the Company. For purposes of this
         Section 4.01, in the event a rating is not available from either Moodys
         or S&P, such rating agency will be deemed to have assigned its lowest
         rating.
 
          (c) Limitations on Sales and Leasebacks. The Company will not itself,
     and will not permit any subsidiary to, enter into any arrangement with any
     bank, insurance company or other lender or investor (not including the
     Company or any subsidiary) or to which any such lender or investor is a
     party, providing for the leasing by the Company or a subsidiary for a
     period, including renewals, in excess of three years, of any Principal
     Property (as defined in the Public Indenture) which has been or is to be
     sold or transferred more than 180 days after the completion of construction
     and commencement of full operation thereof, by the Company or any
     subsidiary to such lender or investor or to any Person to whom funds have
     been or are to be advanced by such lender or investor on the security of
     such Principal Property (herein referred to as a "sale and leaseback
     transaction") unless either:
 
             (i) the Company or such subsidiary could create Indebtedness
        secured pursuant to Section 1005 of the Public Indenture on the
        Principal Property to be leased back in an amount equal to the
        Attributable Debt with respect to the lease resulting from such sale and
        leaseback transaction without equally and ratably securing the Notes; or
 
             (ii) the Company within 180 days after the sale or transfer shall
        have been made by the Company or by a subsidiary, applies an amount
        equal to the greater of (A) the net proceeds of the sale of the
        Principal Property sold and leased back pursuant to such arrangement or
        (B) the net amount (after deducting applicable reserves) at which such
        Principal Property is carried on the books of the Company or such
        subsidiary at the time of entering into such arrangement, to the
        retirement of Indebtedness of the Company.
 
          (d) Compliance with Indenture. The Company will comply with the
     provisions of Sections 1004 and 1005 of the Public Indenture (a true and
     complete copy of which the Company hereby represents has been furnished to
     each Bank), which provisions, together with related definitions, are hereby
     incorporated herein by reference for the benefit of the Banks and shall
     continue in effect for purposes of this Section 4.02 regardless of
     termination, or any amendment or waiver of, or any consent to any deviation
     from or other modification of, the Public Indenture; provided, however,
     that, for purposes of this Section 4.02, (a) references in the Public
     Indenture to "the Securities" shall be deemed to refer to the obligations
     of the Company to pay the principal of and interest on the Notes, (b)
     references in the Public Indenture to "the Trustee" shall be deemed to
     refer to the Agent, (c) references in the Public Indenture to "this
     Indenture" shall be deemed to refer to this Agreement and (d) references in
     the Public Indenture to "supplemental indentures" shall be deemed to refer
     to supplements to this Agreement.
 
          (e) Limitation on Mortgages. The Company will not incur, issue, assume
     or guarantee any indebtedness secured by a mortgage on oil, gas, coal or
     other minerals in place, or on related leasehold or other property
     interest, which is incurred to finance development or production costs if
     the aggregate amount of all such indebtedness exceeds 10% of Consolidated
     Net Tangible Assets (as defined in the Public Indenture).
 
          (f) Consolidated Stockholders' Equity. The Company will maintain, at
     the end of each calendar quarter, Consolidated Stockholders' Equity of at
     least $650,000,000 exclusive of the effect of any noncash writedowns made
     subsequent to the date hereof.
 
          (g) Current Ratio. The Company will maintain, at the end of each
     calendar quarter, consolidated current assets plus the Commitments minus
     the then outstanding Loans in an amount at least equal to its consolidated
     current liabilities.
 
          (h) Notice of Dispositions of Property. The Company shall promptly
     notify the Agent of any sales, transfers, distributions or other
     dispositions during any calendar year resulting in the receipt of Net
 
                                       17
<PAGE>   21
 
         Proceeds in an aggregate amount in excess of $50,000,000 of property
         identified in the most recent Engineer's Opinion delivered pursuant to
         Section 4.01.
 
          (i) Insurance. The Company will at all times maintain, with
     financially sound and reputable insurers, insurance of the kinds, covering
     the risks and in the relative proportionate amounts customarily carried by
     companies engaged in the same or similar business and similarly situated.
 
                                   ARTICLE V
 
                             CONDITIONS OF LENDING
 
     SECTION 5.01. Conditions Precedent to the Initial Loans. The obligation of
each Bank to make its initial Loan is subject to the conditions precedent that
each Bank and the Agent shall have received on or before the date of the initial
Loan:
 
          (a) An appropriate Note payable to its order.
 
          (b) Certified copies of the resolutions of the Board of Directors or
     the Executive Committee of the Board of Directors of the Company
     authorizing the execution, delivery and performance of this Agreement and
     the execution, issuance, delivery and performance of the Notes.
 
          (c) An opinion of Messrs. Davis Polk & Wardwell, special counsel to
     the Company, to the effect that:
 
             (i) the Company is validly existing and in good standing under the
        laws of the State of Delaware;
 
             (ii) this Agreement and the Notes have been duly authorized,
        executed and delivered by the Company;
 
             (iii) this Agreement constitutes a valid and binding agreement of
        the Company and the Notes constitute valid and binding obligations of
        the Company, in each case enforceable in accordance with their
        respective terms, subject to the effect of applicable bankruptcy,
        insolvency or similar laws affecting creditors' rights generally and
        equitable principles of general applicability;
 
             (iv) the execution, delivery and performance by the Company of this
        Agreement and the Notes will not conflict with the restated certificate
        of incorporation or by-laws of the Company, each as in effect on the
        date of such opinion; and
 
             (v) no authorization, consent or approval of any governmental body
        or agency of the State of New York or the United States of America which
        has not been obtained is required in connection with the execution,
        delivery and performance by the Company of this Agreement and the Notes.
 
     In rendering such opinion, Messrs. Davis Polk & Wardwell may rely upon
     opinions of local counsel as to matters of local law and may state that
     they have relied as to certain matters on information obtained from public
     officials, officers of the Company and other sources believed by them to be
     responsible.
 
          (d) A favorable opinion of the General Counsel or General Attorney of
     the Company, to the effect that:
 
             (i) the Company is qualified to do business as a foreign
        corporation and is in good standing in the States of Kansas, Louisiana,
        Montana, New Mexico, Oklahoma, Texas and Wyoming;
 
             (ii) the execution, delivery and performance of this Agreement and
        the execution, issuance, delivery and performance of the Notes will not
        (x) contravene any applicable provision of any applicable law or
        applicable order or (y) conflict with any provision of any indenture,
        loan agreement or other similar agreement or instrument known to such
        counsel (having made due inquiry with respect thereto) binding on the
        Company or affecting its property, and
 
                                       18
<PAGE>   22
 
             (iii) to the knowledge of such counsel (having made due inquiry
        with respect thereto), there is no proceeding pending or threatened
        before any court or administrative agency which, in the opinion of such
        counsel, will result in a final determination which would have the
        effect of preventing the Company from carrying on its business or from
        meeting its current and anticipated obligations on a timely basis.
 
     In rendering such opinion, the General Counsel or General Attorney of the
     Company shall opine only as to matters governed by the Federal laws of the
     United States of America, the laws of the State of Texas and the General
     Corporation Law of the State of Delaware. Such counsel may also state that
     he has relied on certificates of state officials as to qualification to do
     business and good standing, certificates of officers of the Company and
     other sources believed by him to be responsible.
 
          (e) A copy of a written irrevocable notice from the Company
     terminating the Commitments, as defined in the Credit Agreement and
     directing the Agent, as defined in the Credit Agreement, to prepay by wire
     transfer, in immediately available funds, in full any loans then
     outstanding thereunder, together with accrued interest thereon and any
     unpaid commitment fees then accrued.
 
          (f) A certificate of a responsible officer of the Company to the
     effect that:
 
             (i) the representations and warranties contained in Section 3.01
        are true and accurate on and as of the date of the making of each such
        Loan as though made on and as of such date (except to the extent that
        such representations and warranties relate solely to an earlier date);
 
             (ii) no event has occurred and is continuing or would result from
        the proposed borrowing, which constitutes an Event of Default or would
        constitute an Event of Default with the giving of notice or lapse of
        time, or both;
 
             (iii) the Company is in compliance with all the terms, covenants
        and conditions of this Agreement which are binding upon it; and
 
             (iv) after giving effect to the proposed borrowing of which such
        Loan is a part and the application of the proceeds thereof, the
        Available Borrowing Base would not be less than zero.
 
     SECTION 5.02. Conditions Precedent to Loans. The obligation of each Bank to
make any Loan is subject to the further conditions precedent that on the
relevant Borrowing Date clauses (i) through (iv) in subsection (f) of Section
5.01 shall be true and such borrowing shall be deemed to constitute a
certification by the Company that such statements are true.
 
                                   ARTICLE VI
 
                               EVENTS OF DEFAULT
 
     SECTION 6.01. Events of Default. If one or more of the following events of
default ("Events of Default") shall occur and be continuing:
 
          (a) the Company shall default in any payment of principal of any Loan
     when due and such default shall continue for a period of 3 days; or the
     Company shall default in any payment of interest on any Loan, or in the
     payment of any commitment fees pursuant to Section 2.04, when due and
     payable, and such default shall continue for a period of 10 days;
 
          (b) any representation or warranty, or certification made by the
     Company herein or any statement or representation or certification made or
     deemed to be made pursuant to Article V of this Agreement shall prove to
     have been incorrect in any material respect when made;
 
          (c) the Company shall default in the performance of any other term,
     condition, covenant or agreement contained in this Agreement and such
     default shall continue unremedied for a period of 30 days after written
     notice thereof, specifying such default and requiring it to be remedied,
     shall have been received by the Company from any Bank,
 
                                       19
<PAGE>   23
 
          (d) the Company shall default in the performance of any term,
     condition, covenant or agreement contained in the Public Indenture and such
     default shall have resulted in any of the Securities (as defined in the
     Public Indenture) being declared due and payable prior to the date on which
     such Securities would otherwise have become due and payable;
 
          (e) the Company or any subsidiary shall (i) default in the payment of
     principal of any Indebtedness in an aggregate principal amount in excess of
     $25,000,000 (other than the Notes) beyond the period of grace, if any,
     provided in the instrument or agreement under which such Indebtedness was
     created as and when the same shall become due and payable whether at
     maturity, upon redemption, by declaration or otherwise, or (ii) default in
     the observance or performance of any other agreement or condition relating
     to any such Indebtedness or contained in any instrument or agreement
     evidencing, securing or relating thereto, or any other event shall occur or
     condition exist unremedied or unwaived, the effect of which default or
     other event or condition is to cause, or to permit the holder or holders of
     such Indebtedness (or a trustee or agent on behalf of such holder or
     holders) to cause, with the giving of notice if required, but without the
     passage of any additional time, such Indebtedness to become due prior to
     its stated maturity,
 
          (f) the Company shall (i) apply for or consent to the appointment of,
     or the taking of possession by, a receiver, custodian, trustee or
     liquidator of itself or of its property, (ii) admit in writing its
     inability to pay its debts as such debts become due, (iii) make a general
     assignment for the benefit of its creditors, (iv) commence a voluntary case
     under the federal Bankruptcy Code (as now or hereafter in effect), (v) file
     a petition seeking to take advantage of any other law providing for similar
     relief of debtors, or (vi) consent or acquiesce in writing to any petition
     duly filed against it in any involuntary case under such Bankruptcy Code;
 
          (g) a proceeding or case shall be commenced, without the application
     or consent of the Company, in any court of competent jurisdiction seeking
     (i) its liquidation, reorganization, dissolution or winding up, or the
     composition or readjustment of its debts, (ii) the appointment of a
     trustee, receiver, custodian, liquidator or the like of it or of its
     assets, or (iii) similar relief in respect of it, under any law providing
     for the relief of debtors, and such proceeding or case shall continue
     undismissed, or unstayed and in effect, for a period of 60 days (or such
     longer period, so long as the Company shall be taking such action in good
     faith as shall be reasonably necessary to obtain the timely dismissal or
     stay of such proceeding or case); or an order for relief shall be entered
     in an involuntary case under the federal Bankruptcy Code (as now or
     hereafter in effect), against the Company, or
 
          (h) any Change in Control shall occur,
 
then and in each and every case the Majority Banks, by notice in writing to the
Company, may terminate the Commitments of the Banks hereunder and/or declare the
unpaid balance of the Notes and any other amounts payable hereunder to be
forthwith due and payable and thereupon such balance shall become so due and
payable without presentation, protest or further demand or notice of any kind,
all of which are hereby expressly waived; provided that in the case of clause
(f) or (g) above the Commitments of the Banks hereunder shall automatically
terminate and the Notes and any other amounts payable hereunder shall forthwith
be due and payable.
 
                                  ARTICLE VII
 
                      THE AGENT AND THE DETERMINING BANKS
 
     SECTION 7.01. Powers. Each Bank hereby irrevocably appoints and authorizes
the Agent to act as its agent hereunder. The Agent and the Determining Banks
shall have and may exercise such powers hereunder and under any agreement
executed and delivered pursuant to the terms hereof as are specifically
delegated to the Agent or the Determining Banks, as the case may be, by the
terms hereof or thereof, together with such powers as are reasonably incidental
thereto. The Agent and the Determining Banks will have no duties or
responsibilities except those expressly set forth in this Agreement, and shall
not by reason of this Agreement have a fiduciary relationship with any Bank.
 
                                       20
<PAGE>   24
 
     SECTION 7.02. Agent's Reliance, Etc. In performing its duties as Agent or a
Determining Bank hereunder and under any agreement executed and delivered
pursuant to the terms hereof, the Agent and each Determining Bank will take the
same care as it takes in connection with loans in which it alone is interested.
However, neither the Agent nor the Determining Banks nor any of their directors,
officers, agents or employees shall be liable for any action taken or omitted to
be taken by them hereunder or thereunder or in connection herewith or therewith
except for their own gross negligence or willful misconduct.
 
     SECTION 7.03. No Responsibility for Recitals, Etc. The Agent and the
Determining Banks will not be responsible to the Banks for any recitals,
statements, warranties or representations herein or under any agreement executed
and delivered pursuant to the terms hereof, for the value, effectiveness,
genuineness, enforceability or sufficiency of this Agreement, the Notes or any
agreement executed and delivered pursuant hereto or be bound to ascertain or
inquire as to the performance or observance of any of the terms of this
Agreement on the part of the Company or of any of the terms of any such other
agreement by any party thereto.
 
     SECTION 7.04. Right to Indemnity. The Agent shall be fully justified in
failing or refusing to take any action hereunder or under any agreement executed
and delivered pursuant to the terms hereof unless it shall first be indemnified
(upon requesting such indemnification) to its satisfaction by the Banks against
any and all liability and expense which it may incur by reason of taking or
continuing to take any such action. The Banks agree to indemnify the Agent and
the Determining Banks, to the extent not reimbursed by the Company under this
Agreement, ratably in accordance with the aggregate principal amount of the
Loans made by them (or, if no Loans are outstanding, ratably in accordance with
their respective Commitments), for any and all liabilities, obligations,
damages, penalties, actions, judgments, suits, costs, expenses or disbursements
of any kind and nature whatsoever which may be imposed on, incurred by or
asserted against the Agent as agent or the Determining Banks, as the case may
be, in any way relating to or arising out of this Agreement, the Notes or any
other documents contemplated by or referred to herein or the transactions
contemplated hereby (including, without limitation, the costs and expenses which
the Company is obligated to pay under this Agreement but excluding, unless an
Event of Default has occurred and is continuing, normal administrative costs and
expenses incident to the performance of its agency duties hereunder) or the
enforcement of any of the terms hereof or thereof or of any such other
documents; provided no such liability, obligation, damage, penalty, action,
judgment, suit, cost, expense or disbursement results from the Agent's or the
Determining Banks', as the case may be, gross negligence or willful misconduct;
provided, however, that, in the event the Agent receives indemnification from
the Banks hereunder with respect to costs and expenses which the Company is
obligated to pay under this Agreement, the Agent shall remit to the Banks the
amount of such costs and expenses to the extent subsequently paid by the
Company, such remittance to be in accordance with the proportionate amount of
the indemnification made by each respective Bank.
 
     SECTION 7.05. Action on Instructions of Banks. The Agent shall in all cases
be fully protected in acting or refraining from acting hereunder or under any
agreement executed and delivered pursuant to the terms hereof in accordance with
written instructions to it signed by the Majority Banks, and (subject to Section
8.01) such instructions and any action taken or failure to act pursuant thereto
shall be binding on all of the Banks.
 
     SECTION 7.06. Employment of Agents. The Agent and the Determining Banks may
employ agents and attorneys-in-fact and shall not be answerable, except as to
money or securities received by them or their authorized agents, for the default
or misconduct of any such agent or attorney-in-fact selected by it with
reasonable care.
 
     SECTION 7.07. Reliance on Documents. The Agent and each Determining Bank
shall be entitled to rely upon (a) any paper or document believed by it to be
genuine and to have been signed or sent by the proper person or persons and (b)
the opinion of its counsel with respect to legal matters. The Agent and the
Determining Banks may deem and treat the payee of any Note as the owner thereof
for all purposes hereof unless and until a notice of the assignment or transfer
thereof satisfactory to the Agent signed by such payee shall have been filed
with the Agent.
 
                                       21
<PAGE>   25
 
     SECTION 7.08. Rights as a Bank. With respect to its Commitment and the
Loans made by it, the Agent and each Determining Bank shall have the same rights
and powers hereunder and under any agreement executed and delivered pursuant to
the terms hereof as any Bank and may exercise the same as though it were not the
Agent or Determining Bank, as the case may be, and the term "Bank" or "Banks"
shall, unless the context otherwise indicates, include the Agent and each
Determining Bank in its capacity as a Bank hereunder and thereunder. The Agent
and the Determining Banks and their respective affiliates may accept deposits
from, lend money to, and generally engage in any kind of banking or trust
business with the Company, its subsidiaries and its affiliates as if it were not
the Agent or a Determining Bank, as the case may be.
 
     SECTION 7.09. Non-Reliance on Agent or other Banks. Each Bank agrees that
it has, independently and without reliance on the Agent or on any other Bank,
and based on such documents and information as it has deemed appropriate, made
its own credit analysis of the Company and decision to enter into this Agreement
and that it will, independently and without reliance upon the Agent or any other
Bank, and based on such documents and information as it shall deem appropriate
at the time, continue to make its own analysis and decisions in taking or not
taking action under this Agreement or the Notes. The Agent and the Determining
Banks will not be required to keep themselves informed as to the performance or
observance by the Company of this Agreement or any other document referred to or
provided for herein or therein or to inspect the properties or books of the
Company. Except for notices, reports and other documents expressly required to
be furnished to the Banks by the Agent hereunder, the Agent shall not have any
duty or responsibility to provide any Bank with any credit or other information
concerning the affairs, financial condition or business of the Company or which
may at any time come into possession of the Agent or any of its affiliates.
 
     SECTION 7.10. Events of Default. In the event the Agent receives actual
knowledge of an Event of Default hereunder, the Agent shall promptly inform the
Banks thereof. The Agent shall not be deemed to have actual knowledge of an
Event of Default hereunder until it shall have received a written notice from
the Company or any Bank referring to this Agreement, describing such Event of
Default and stating that such notice is a "Notice of Default".
 
     SECTION 7.11. Successor Agent. If the Agent shall resign as Agent under
this Agreement, or shall cease to be a Bank under this Agreement, then the Banks
shall appoint any Bank which is a party to this Agreement (with the consent of
such Bank) as successor Agent for the Banks under this Agreement, whereupon such
successor Agent shall succeed to the rights, powers and duties of the Agent, and
the former Agent's rights, powers and duties as Agent shall be terminated and
cancelled, without any other or further act or deed on the part of such former
Agent or any of the parties to this Agreement.
 
                                  ARTICLE VIII
 
                                 MISCELLANEOUS
 
     SECTION 8.01. Modifications, Consents and Waivers. To the extent permitted
by law, no failure or delay on the part of the Banks in exercising any power or
right hereunder shall operate as a waiver thereof, nor shall any single or
partial exercise of any such right or power preclude any other or further
exercise thereof or the exercise of any other right or power hereunder. No
modification or waiver of any provision of this Agreement or of the Notes nor
consent to any departure by the Company therefrom shall in any event be
effective unless the same shall be in writing and signed by the Majority Banks,
and then such waiver or consent shall be effective only in the specific instance
and for the purpose for which given; provided, however, that no such
modification, waiver or consent may be made which will (a) extend the time for
payment of principal of or interest on any Note or reduce the principal amount
of or rate of interest on any Note or otherwise affect the terms of payment of
the principal of or interest on any Note without the written consent of the
holder of such Note or (b) affect the terms of or reduce the amount of the
commitment fee or reduce the percentages of 66 2/3% and 75% specified in the
definition of "Majority Banks" or amend the provisions of this Section 8.01
without the written consent of the holders of all Notes at the time outstanding
(or, if no Notes are then outstanding, all of the Banks). No notice to or demand
on the Company in any case shall, of itself, entitle the Company to any other or
further notice or demand in similar or other circumstances.
 
                                       22
<PAGE>   26
 
     SECTION 8.02. Confidentiality. Each Bank shall maintain in confidence and
not publish, disseminate or disclose in any manner or to any Person and shall
not use any nonpublic information relating to the Company and its subsidiaries
which may be furnished pursuant to this Agreement (hereinafter collectively
called "Confidential Information"), subject to each Bank's (a) obligation to
disclose any such Confidential Information pursuant to a request or order under
applicable laws and regulations or pursuant to a subpoena or other legal
process, (b) right to disclose any such Confidential Information to bank
examiners, its affiliates, auditors, counsel and other professional advisors,
(c) right to use any such Confidential Information in connection with evaluating
the transactions set forth herein, and (d) right to disclose any such
Confidential Information in connection with any litigation involving the Banks
and the Company, provided, however, that Confidential Information disclosed
pursuant to clause (b) or (d) of this sentence shall be so disclosed subject to
such procedures as are reasonably calculated to maintain the confidentiality
thereof, and provided, further, that Confidential Information disclosed pursuant
to applicable laws, regulations, subpoenas or other legal process shall be so
disclosed subject to such confidentiality provisions, if any, as may be provided
under applicable law. The Banks agree, to the extent permitted by applicable
law, to use their best efforts promptly to notify the Company in writing of each
order, subpoena or other legal process providing for the disclosure and/or
production of Confidential Information and shall, to the extent permitted by
applicable law, use their best efforts promptly to supply the Company with a
copy of such order, subpoena or other legal process, in order that the Company
may intervene in the relevant administrative or legal proceeding or take other
appropriate legal action to protect the confidentiality of such Confidential
Information.
 
     SECTION 8.03. Addresses for Notices. Except as otherwise provided herein,
all communications and notices provided for hereunder shall be in writing and,
if to the Company, mailed to P.O Box 1330, Houston, Texas 77251-1330 Attention:
Treasurer, and, if to the Agent, delivered or mailed to 270 Park Avenue, New
York, New York 10017 (Attention: Energy Division), and, if to any Bank,
delivered or mailed to its address as set forth on the signature pages hereof,
or, as to any party, at such other address as such party may designate in
writing to each party concerned. Except as otherwise provided herein, all
communications and notices provided for hereunder shall be effective when
deposited in the mails, postage prepaid, or delivered to the telegraph company,
addressed as aforesaid.
 
     SECTION 8.04. Costs, Expenses and Taxes. The Company agrees to pay all
costs and expenses in connection with the preparation, execution and delivery of
this Agreement and the Notes (including the reasonable fees of Messrs. Simpson
Thacher & Bartlett, special counsel to the Agent) and costs and expenses, if
any, in connection with the enforcement of this Agreement and the Notes, as well
as any and all stamp and other taxes payable or determined to be payable in
connection with the execution or delivery of this Agreement or the Notes, and to
save the holders of the Notes harmless from any and all liabilities with respect
to or resulting from any delay or omission to pay such taxes, if any, which may
be payable or determined to be payable in connection with the execution and
delivery of this Agreement or the Notes.
 
     SECTION 8.05. Binding Effect and Assignment. This Agreement shall be
binding upon and inure to the benefit of the Company and the Banks and their
respective successors and assigns, except that the Company may not assign or
transfer its rights hereunder without prior written consent of the Banks. A Bank
may not assign or transfer its rights hereunder, subject to any legal or
regulatory requirements, without prior written consent of the Company, provided,
however, that each Bank may at any time grant participations in its Loans and
its Commitment ("Participations") to other Persons (such Persons being herein
called "Participants"). The Company agrees that each Participant shall be deemed
to be a "Bank" for purposes of Sections 2.12(a), 2.14 and 2.20 with respect to
its Participations outstanding from time to time. Each Bank agrees with the
Company that (a) each such Participation shall be created in the ordinary course
of the commercial banking business of such Bank and (b) such Participation shall
be created by such Bank in compliance with all applicable laws. Each Bank agrees
that the creation of Participations shall require no action on the part of the
Company. The creation of a Participation shall not give any Participant any
rights under this Agreement or any Note nor shall it relieve any Bank of its
obligations under this Agreement. Each assignment will be subject to the payment
of a service fee of $3,000 to the Agent by the parties to such assignment.
 
     SECTION 8.06. Termination and Substitution of Bank. (a) If (i) the
obligation of any Bank to make, convert Loans into or continue Eurodollar Loans
has been suspended pursuant to Section 2.13 or (ii) any
 
                                       23
<PAGE>   27
 
Bank has demanded compensation under Section 2.12, the Company may, upon three
Business Days' notice to such Bank through the Agent, prepay in full all of the
outstanding Loans of such Bank, or its assignee, together with accrued interest
thereon to the date of prepayment and all other amounts payable hereunder to
such Bank accrued to the date of prepayment, and concurrently therewith
terminate this Agreement with respect to such Bank by giving notice of such
termination to the Agent and such Bank.
 
     (b) If any Bank shall become a Defaulting Bank, the Company may, in its
sole discretion and without prejudice to any right or remedy that the Company
may have against such Defaulting Bank with respect to, on account of, arising
from or relating to any event pursuant to which such Bank shall be a Defaulting
Bank, upon notice to such Defaulting Bank and the Agent, (i) if at such time
there are no Loans of such Defaulting Bank outstanding, terminate this Agreement
with respect to such Defaulting Bank, or (ii) if at such time such Defaulting
Bank shall have Loans outstanding, subject to obtaining a substitute bank or
banks to assume the Commitment of such Defaulting Bank pursuant to subsection
(c) below, terminate this Agreement with respect to such Defaulting Bank and
prepay in full the outstanding Loans of such Defaulting Bank together with
accrued interest to the date of prepayment, provided that the provisions of
Section 2.20 shall not apply to any such prepayment.
 
     (c) If the Company terminates this Agreement with respect to any Bank under
this Section 8.06, the Company shall use its best efforts, with the assistance
of the Agent, to seek a mutually satisfactory substitute bank or banks (which
may be one or more of the Banks) to assume the Commitment of such relevant Bank.
 
     SECTION 8.07. Governing Law. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of New York.
 
     SECTION 8.08. Headings. Article and Section headings used in this Agreement
are for convenience only and shall not affect the construction of this
Agreement.
 
     SECTION 8.09. Execution in Counterparts. This Agreement may be executed by
the parties hereto individually or in any combinations of the parties hereto in
several separate counterparts, each of which shall be an original, and all of
which taken together shall constitute one and the same agreement.
 
                                       24
<PAGE>   28
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized as of the day
and year first above written.
 
                                          ANADARKO PETROLEUM CORPORATION
 
                                          By:  A. L. Richey
                                          Title: Treasurer
 
                                          CHEMICAL BANK
 
                                          By:  Peter N. Anderson
                                          Title: Managing Director
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                               Chemical Bank
                                               270 Park Avenue, 8th Floor
                                               New York, New York 10017
                                               Attention: John Gehebe
                                                          Phone: (212) 270-3531
                                                          Fax: (212) 270-4892
 
                                          Eurodollar Lending Office:
 
                                               Chemical Bank
                                               270 Park Avenue, 8th Floor
                                               New York, New York 10017
                                               Attention: John Gehebe
                                                          Phone: (212) 270-3531
                                                          Fax: (212) 270-4892
 
                                       25
<PAGE>   29
 
                                          THE CHASE MANHATTAN BANK,
                                          NATIONAL ASSOCIATION
 
                                          By:  Bettylou J. Robert
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          The Chase Manhattan Bank, National
                                          Association
                                               1 Chase Manhattan Plaza
                                               3rd Floor
                                               New York, New York 10081
                                               Attention: Global Energy
                                                          Mr. Vito Cipriano
                                                          Fax: (212) 552-1687
                                               with copies to:
                                                Chase Manhattan Southwest
                                                1100 Milam
                                                Suite 2345
                                                Houston, Texas 77002
                                                Attention: Mr. Richard S. Walker
                                                           Fax: (713) 751-9122
   
                                          Eurodollar Lending Office:
 
                                          The Chase Manhattan Bank, National
                                          Association
                                          1 Chase Manhattan Plaza
                                          3rd Floor
                                          New York, New York 10081
                                          Attention: Global Energy
                                                     Mr. Vito Cipriano
                                                     Fax: (212) 552-1687
 
                                          MORGAN GUARANTY TRUST COMPANY OF
                                            NEW YORK
 
                                          By:  Vernon M. Ford, Jr.
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Morgan Guaranty Trust Company of New
                                          York
                                               60 Wall Street
                                               22nd Floor
                                               New York, New York 10260
                                               Attention: Jeannie Mattson
 
                                       26
<PAGE>   30
 
                                          Eurodollar Lending Office:
 
                                          J. P. Morgan Delaware
                                               902 Market Street
                                               Wilmington, Delaware 19801
                                               Attention: Loan Department
                                                          Telex
                                                          Number/Answerback:
                                                          177425/NBDELUT
 
                                          THE BANK OF NEW YORK
 
                                          By:  Renee Biglani
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          The Bank of New York
                                               Attention: Brad Davis and/or
                                                          Commercial Loan
                                                          Department
                                          1 Wall Street
                                          19th Floor
                                          New York, New York 10286
 
                                          Eurodollar Lending Office:
 
                                          The Bank of New York
                                               Attention: Eurodollar/Cayman
                                                          Islands Funding Area
                                               101 Barclay St.
                                               New York, New York 10286
                                          Ref: Anadarko Petroleum Corporation
 
                                          CONTINENTAL BANK N.A.
 
                                          By:  R. R. Ingersoll
                                          Title: Vice President
 
                                          Address for Notices:
 
                                          Continental Bank N.A.
                                               231 South LaSalle Street
                                               Chicago, Illinois 60697
                                               Attention: R. R. Ingersoll
 
                                          Domestic Lending Office:
 
                                          Continental Bank N.A.
                                               231 South LaSalle Street
                                               Chicago, Illinois 60697
                                               Attention: Kathy Hill-Rayford
 
                                       27
<PAGE>   31
 
                                          Eurodollar Lending Office:
 
                                          Continental Bank N.A.
                                               231 South LaSalle Street
                                               Chicago, Illinois 60697
                                               Attention: Kathy Hill-Rayford
 
                                          CREDIT SUISSE
 
                                          By:  William P. Murray
                                          Title: Member of Senior Management
 
                                          By:  Eristinn R. Kristinsson
                                          Title: Associate
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Credit Suisse
                                               Tower 49
                                               12 East 49th Street
                                               New York, New York 10017
                                               Attention: Credit Department,
                                                          Kris Kristinsson
 
                                          Eurodollar Lending Office:
 
                                          Credit Suisse
                                               Tower 49
                                               12 East 49th Street
                                               New York, New York 10017
                                               Attention: Credit Department,
                                                          Kris Kristinsson
 
                                       28
<PAGE>   32
 
                                          MELLON BANK, N.A.
 
                                          By:  Mary Elles Usher
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Mellon Bank, N.A.
                                               3 Mellon Bank Center
                                               Room 2301
                                               Pittsburgh, Pennsylvania 15259
                                               Attention: Loan Administration
                                               with copies to:
                                                  Mellon Bank, N.A.
                                                  1100 Louisiana Street
                                                  Suite 3600
                                                  Houston, Texas 77002
                                                  Attention: Janet Jenkins
             
                                                  One Mellon Bank Center
                                                  44th Floor
                                                  Pittsburgh, Pennsylvania 15258
                                                  Attention: Energy & Utilities
                                                             Group
 
                                          Eurodollar Lending Office:
 
                                          Mellon Bank, N.A.
                                               3 Mellon Bank Center
                                               Room 2301
                                               Pittsburgh, Pennsylvania 15259
                                               Attention: Loan Administration
 
                                          BANK OF AMERICA NATIONAL TRUST
                                            AND SAVINGS ASSOCIATION
 
                                          By:  David Sisler
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Bank of America National Trust and
                                          Savings Association
                                               1850 Gateway Blvd.
                                               Concord, California 94520
 
                                          Eurodollar Lending Office:
 
                                          Bank of America National Trust and
                                          Savings Association
                                               1850 Gateway Blvd.
                                               Concord, California 94520
 
                                       29
<PAGE>   33
 
                                          CREDIT LYONNAIS CAYMAN ISLAND BRANCH
 
                                          By:  Xavier Ratouis
                                          Title: Authorized Signature
 
                                          Address for Notices:
 
                                          c/o Credit Lyonnais Houston
                                          Representative Office
                                               1000 Louisiana Street #5360
                                               Houston, TX 77002
                                               Attention: W. Keith Buchanan
                                                          Fax: (713) 751-0307
 
                                          Domestic Lending Office:
 
                                          Credit Lyonnais Cayman Island Branch
                                               1301 Avenue of the Americas
                                               New York, New York 10019
                                               Attention: Loan Servicing
 
                                          Eurodollar Lending Office:
 
                                          Credit Lyonnais Cayman Island Branch
                                               1301 Avenue of the Americas
                                               New York, New York 10019
                                               Attention: Loan Servicing
 
                                          THE FIRST NATIONAL BANK OF CHICAGO
 
                                          By:  Martha Redeck Smith
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          The First National Bank of Chicago
                                               One First National Plaza
                                               Suite 0634, 10th Floor
                                               Chicago, Illinois 60670
                                               Attention: Edward Milka
                                                          Phone (312) 732-8573
                                                          Fax: (312) 732-4840
                                                          Telex: 190201; Ansback
                                                          FNBCUT
 
                                          Eurodollar Lending Office:
 
                                          The First National Bank of Chicago
                                               One First National Plaza
                                               Suite 0634, 10th Floor
                                               Chicago, Illinois 60670
                                               Attention: Edward Milka
                                                          Phone (312) 732-8573
                                                          Fax: (312) 732-4840
                                                          Telex: 190201; Ansback
                                                          FNBCUT
 
                                       30
<PAGE>   34
 
                                          NATIONSBANK OF TEXAS, N.A.
 
                                          By:  Paul A. Squirs
                                          Title: Senior Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          NationsBank of Texas, N.A.
                                               P.O. Box 830104
                                               Dallas, Texas 75283-0104
                                               Attention: Vicky McConnell
 
                                          Eurodollar Lending Office:
 
                                          NationsBank of Texas, N.A.
                                               P.O. Box 830104
                                               Dallas, Texas 75283-0104
                                               Attention: Vicky McConnell
 
                                          CHEMICAL BANK, as Agent
 
                                          By:  Peter N. Anderson
                                          Title: Managing Director
 
                                          Address: 270 Park Avenue
                                                   New York, New York 10017
                                                   Attention: Energy Division
 
                                       31
<PAGE>   35
 
                                                                       EXHIBIT A
 
                                 [FORM OF NOTE]
$______*______                                                New York, New York
 
                                                        __________________, 1994
 
     For value received, ANADARKO PETROLEUM CORPORATION, a Delaware corporation
(the "Company"), promises to pay on the Termination Date, to the order of
____________________ (the "Bank") at the office of Chemical Bank specified in
Section 2.11 of the Revolving Credit Agreement, dated as of May 24, 1994, among
the Company, the Bank, the several other banks party thereto and Chemical Bank,
as agent (as amended, supplemented or modified from time to time hereafter, the
"Agreement"; terms defined in the Agreement shall have their defined meanings
when used in this Note), in lawful money of the United States of America, the
principal amount of ______*______ DOLLARS ($______*______) or, if less than such
principal amount, the aggregate unpaid principal amount of all Loans made by the
Bank to the undersigned pursuant to Section 2.01 of the Agreement. The
undersigned further agrees to pay interest at said office, in like money, on the
unpaid principal amount owing hereunder from time to time from the date hereof
at the rates specified in Section 2.09 of the Agreement. Such interest shall be
payable on the dates specified in Section 2.09 of the Agreement. The date, Type
and amount of each Loan made by the Bank pursuant to Section 2.01 of the
Agreement, each continuation thereof, each conversion of all or a portion
thereof to another Type and the date and amount of each payment of principal
with respect thereto shall be endorsed by the holder of this Note on Schedule A
annexed hereto, which holder may add additional pages to such Schedule. No
failure to make or error in making any such endorsement as authorized hereby
shall affect the validity of the obligations of the Company hereunder or the
validity of any payment hereof made by the Company.
 
     This Note is one of the Notes referred to in the Agreement and is entitled
to the benefits thereof and is subject to prepayment in whole or in part as
provided therein.
 
     Upon the occurrence of any one or more of the Events of Default specified
in the Agreement, all amounts then remaining unpaid on this Note may be declared
to be immediately due and payable as provided in the Agreement.
 
                                          ANADARKO PETROLEUM CORPORATION


                                          By __________________________________
                                          Title:
 
______________
 
* Insert amount of Bank's Commitment
 
                                       32
<PAGE>   36
 
                                                                      SCHEDULE A
 
                              LOANS AND REPAYMENTS
 
<TABLE>
<CAPTION>
========================================================================================================================
                            AMOUNT              TYPE                               AMOUNT OF
                              OF                 OF             INTEREST           PRINCIPAL                NOTATION
         DATE                LOAN               LOAN              RATE              REPAID                  MADE BY
- ------------------------------------------------------------------------------------------------------------------------
<S>                   <C>                <C>                <C>                <C>                     <C>





</TABLE>
 
                                       A-1
<PAGE>   37
 
                                                                     PAGE ... OF
                                                                      SCHEDULE A
 
 
<TABLE>
<CAPTION>
========================================================================================================================
                            AMOUNT              TYPE                               AMOUNT OF
                              OF                 OF             INTEREST           PRINCIPAL                NOTATION
         DATE                LOAN               LOAN              RATE              REPAID                  MADE BY
- ------------------------------------------------------------------------------------------------------------------------
<S>                   <C>                <C>                <C>                <C>                     <C>



</TABLE>
 
                                       A-2

<PAGE>   1
 
                                                                (CONFORMED COPY)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                         ANADARKO PETROLEUM CORPORATION
 
                             ---------------------
 
                            364-DAY CREDIT AGREEMENT

                             ---------------------
                             DATED AS OF MAY 24, 1994
                             ---------------------
 
                                 $150,000,000
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                               TABLE OF CONTENTS
 
<TABLE>
<S>        <C>    <C>                                                                          <C>
                                            ARTICLE I
                                DEFINITIONS AND ACCOUNTING TERMS
SECTION     1.01  Defined Terms............................................................     1
            1.02  Use of Defined Terms.....................................................     6
            1.03  Accounting Terms.........................................................     6

                                           ARTICLE II
                                    AMOUNT AND TERMS OF LOANS
SECTION     2.01  Loans....................................................................     7
            2.02  Notes....................................................................     7
            2.03  Procedure for Borrowing..................................................     7
            2.04  Commitment Fees..........................................................     7
            2.05  Reduction, Termination or Extension of Commitments.......................     8
            2.06  Optional Prepayments.....................................................     9
            2.07  Mandatory Prepayments....................................................     9
            2.08  Repayment of Loans.......................................................     9
            2.09  Interest Rate............................................................     9
            2.10  Computation of Interest and Fees.........................................    10
            2.11  Pro Rata Treatment and Payments..........................................    10
            2.12  Increased Cost of Loans..................................................    11
            2.13  Illegality...............................................................    12
            2.14  Withholding Tax Exemption................................................    12
            2.15  Substitute Loan Basis....................................................    13
            2.16  Determination of Borrowing Base..........................................    14
            2.17  Certain Prepayments or Conversions Pursuant to Sections 2.12 and 2.13....    14
            2.18  Certain Notices..........................................................    14
            2.19  Use of Proceeds..........................................................    15
            2.20  Indemnity................................................................    15
            2.21  Minimum Amounts of Tranches..............................................    15
            2.22  Conversion and Continuation Options......................................    15

                                           ARTICLE III
                                 REPRESENTATIONS AND WARRANTIES
SECTION     3.01  Representations and Warranties by the Company............................    16

                                           ARTICLE IV
                                    COVENANTS OF THE COMPANY
SECTION     4.01  Covenants................................................................    17

                                            ARTICLE V
                                      CONDITIONS OF LENDING
SECTION     5.01  Conditions Precedent to the Initial Loans................................    18
            5.02  Conditions Precedent to Loans............................................    20

                                           ARTICLE VI
                                        EVENTS OF DEFAULT
SECTION     6.01  Events of Default........................................................    20
</TABLE>
 
                                        i
<PAGE>   3
 
<TABLE>
<S>        <C>    <C>                                                                         <C>
                                           ARTICLE VII
                               THE AGENT AND THE DETERMINING BANKS
SECTION     7.01  Powers...................................................................    21
            7.02  Agent's Reliance, Etc....................................................    21
            7.03  No Responsibility for Recitals, Etc......................................    21
            7.04  Right to Indemnity.......................................................    22
            7.05  Action on Instructions of Banks..........................................    22
            7.06  Employment of Agents.....................................................    22
            7.07  Reliance on Documents....................................................    22
            7.08  Rights as a Bank.........................................................    22
            7.09  Non-Reliance on Agent or other Banks.....................................    22
            7.10  Events of Default........................................................    23
            7.11  Successor Agent..........................................................    23

                                          ARTICLE VIII
                                          MISCELLANEOUS
SECTION     8.01  Modifications, Consents and Waivers......................................    23
            8.02  Confidentiality..........................................................    23
            8.03  Addresses for Notices....................................................    24
            8.04  Costs, Expenses and Taxes................................................    24
            8.05  Binding Effect and Assignment............................................    24
            8.06  Termination and Substitution of Bank.....................................    24
            8.07  Governing Law............................................................    25
            8.08  Headings.................................................................    25
            8.09  Execution in Counterparts................................................    25
EXHIBIT A         Form of Note.............................................................   A-1
EXHIBIT B         Extension Agreement......................................................   B-1
</TABLE>
 
                                       ii
<PAGE>   4
 
                            364-DAY CREDIT AGREEMENT
 
                            DATED AS OF MAY 24, 1994
 
     ANADARKO PETROLEUM CORPORATION, a Delaware corporation (the "Company"), the
Banks listed under "Commitment" in Section 1.01 (individually a "Bank" and
collectively the "Banks") and Chemical Bank, as Agent, do hereby agree as
follows:
 
                                   ARTICLE I
 
                        DEFINITIONS AND ACCOUNTING TERMS
 
     SECTION 1.01. Defined Terms. As used in this Agreement, and unless the
context otherwise requires, the following terms shall have the meanings set out
respectively after each:
 
          "Adjusted CD Rate" -- With respect to any Interest Period for a CD
     Rated Loan, the sum of (a) the quotient (rounded upwards, if necessary, to
     the next higher 1/100 of 1%) obtained by dividing the CD Rate by 1.00 minus
     the Reserve Percentage and (b) the Assessment Rate. The Adjusted CD Rate
     shall be adjusted automatically on and as of the effective date of any
     change in the Reserve Percentage.
 
          "Agent" -- Chemical Bank or its successor appointed pursuant to
     Section 7.11.
 
          "Agreement" -- This 364-Day Credit Agreement, as the same may be
     amended, modified, supplemented or restated from time to time in accordance
     with the terms hereof.
 
          "Assessment Rate" -- With respect to any Interest Period for a CD
     Rated Loan, the net annual assessment rate actually paid by Chemical to the
     Federal Deposit Insurance Corporation (or any successor) for insurance by
     such corporation (or such successor) of time deposits made in dollars at
     offices of Chemical in the United States during the most recent period for
     which such rate has been determined prior to the commencement of such
     Interest Period.
 
          "Attributable Debt" -- Any particular sale and leaseback transaction
     under which the Company or any subsidiary is at the time liable, at any
     date as of which the amount thereof is to be determined (a) in the case of
     any such transaction involving a capital lease, the amount on such date
     capitalized thereunder, or (b) in the case of any other sale and leaseback
     transaction, the then present value of the minimum rental obligations under
     such sale and leaseback transaction during the remaining term thereof
     (after giving effect to any extensions at the option of the lessor)
     computed by discounting the respective rental payments at the actual
     interest factor included in such payments or, if such interest factor
     cannot be readily determined, at the rate of 10% per annum. The amount of
     any rental payment required to be made under any such sale and leaseback
     transaction not involving a capital lease may exclude amounts required to
     be paid by the lessee on account of maintenance and repairs, insurance,
     taxes, assessments, utilities, operating and labor costs and similar
     charges.
 
          "Available Borrowing Base" -- At any time, the amount equal to the
     difference obtained by subtracting from the Borrowing Base then in effect
     the aggregate principal amount of all the outstanding Indebtedness of the
     Company and its subsidiaries (including, without limitation, any then
     outstanding Loans).
 
          "Borrowing Base" -- At any time, the amount calculated by the
     Determining Banks and approved by the Majority Banks as the Borrowing Base
     and then in effect pursuant to Section 2.16; provided however, that from
     the date hereof until such time as the Borrowing Base is so calculated and
     approved and in effect, the Borrowing Base shall be $1,100,000,000.
 
          "Borrowing Date" -- Each Working Day or Business Day, as the case may
     be, specified in a notice pursuant to Section 2.03 as a date on which the
     Company requests (or is deemed to have requested) the Banks to make Loans.
 
                                        1
<PAGE>   5
 
          "Business Day" -- A day which in the City of New York is not a day on
     which banks are generally authorized or obligated by law to close.
 
          "CD Rate" -- With respect to any Interest Period for a CD Rated Loan,
     the average rate per annum bid at 10:00 A.M. (New York City time), or as
     soon thereafter as practicable, on the first day of such Interest Period by
     New York certificate of deposit dealers of recognized standing for the
     purchase at face value from the Reference Banks of their certificates of
     deposit in an amount comparable to the portion of the CD Rated Loans of
     Chemical to which such Interest Period applies and having a maturity
     comparable to such Interest Period.
 
          "CD Rated Loans" -- Loans hereunder at such time as they bear interest
     at a rate based upon the Adjusted CD Rate.
 
          "Change in Control" -- (a) The acquisition by any Person or two or
     more Persons acting in concert of beneficial ownership (within the meaning
     of Rule 13d-3 of the Commission) of 50% or more of the outstanding shares
     of voting stock of the Company unless the Board of Directors of the Company
     shall have publicly announced its support for such acquisition or (b) a
     majority of the members of the Board of Directors of the Company on any
     date shall not have been (i) members of the Board of Directors of the
     Company on the date 12 months prior to such date or (ii) approved by
     Persons who constitute at least a majority of the members of the Board of
     Directors of the Company as constituted on the date 12 months prior to such
     date.
 
          "Chemical" -- Chemical Bank.
 
          "Commission" -- The Securities and Exchange Commission, as from time
     to time constituted, created under the Securities Exchange Act of 1934, or,
     if at any time after the execution of this Agreement such Commission is not
     existing and performing the duties now assigned to it, then the body
     performing such duties at such time.
 
          "Commitment" -- As to each Bank, its obligation to make Loans to the
     Company pursuant to Section 2.01 in the amount set forth opposite its name
     below, as such obligation may be reduced pursuant to this Agreement:
 
<TABLE>
<CAPTION>
                                                            AMOUNT OF       PERCENTAGE OF
                               BANK                        COMMITMENT        COMMITMENT
                               ----                        -----------      -------------
        <S>                                                <C>              <C>
        Chemical Bank..................................... $ 18,000,000          12.0%
        The Chase Manhattan Bank, National Association....   15,000,000          10.0
        Morgan Guaranty Trust Company of New York.........   15,000,000          10.0
        The Bank of New York..............................   12,750,000           8.5
        Continental Bank N.A..............................   12,750,000           8.5
        Credit Suisse.....................................   12,750,000           8.5
        Mellon Bank, N.A..................................   12,750,000           8.5
        Bank of America National Trust and Savings
          Association.....................................   12,750,000           8.5
        Credit Lyonnais Cayman Island Branch..............   12,750,000           8.5
        The First National Bank of Chicago................   12,750,000           8.5
        NationsBank of Texas, N.A.........................   12,750,000           8.5
                  Total................................... $150,000,000         100.0%
                                                           ============     ==========
</TABLE>
 
          "Consolidated Stockholders' Equity" -- The par or stated value of the
     stock of the Company plus paid-in capital plus retained earnings, all as
     shown on the consolidated balance sheet of the Company and its subsidiaries
     prepared in accordance with generally accepted accounting principles, as
     such principles are in effect on the date of this Agreement.
 
          "Credit Agreement" -- The Revolving Credit Agreement, dated as of
     February 15, 1992, among the Company, the banks named therein and
     Manufacturers Hanover Trust Company, as agent.
 
                                        2
<PAGE>   6
 
          "Defaulting Bank" -- Any Bank that shall (i) fail to make any Loan
     required to be made by it hereunder, (ii) state in writing that it will not
     make, or that it has disaffirmed or repudiated its obligation to make, any
     Loan required to be made by it hereunder, by reason of the provisions of
     the Financial Institution Reform, Recovery and Enforcement Act of 1989 or
     otherwise or (iii) assign or transfer all or a part of its rights hereunder
     without the prior written consent of the Company.
 
          "Determining Banks" -- Chemical, Morgan Guaranty Trust Company of New
     York and The Chase Manhattan Bank, National Association.
 
          "Domestic Lending Office" -- Initially, the office of a Bank
     designated as such and set forth with its signature below, and thereafter
     such other office of such Bank, if any, of which such Bank shall notify the
     Agent and Company in writing.
 
          "Domestic Loans" -- All Reference Rated Loans and CD Rated Loans.
 
          "Effective Date" -- May 24, 1994, or such other date as the parties
     hereafter shall agree upon.
 
          "Engineer's Opinion" -- A report prepared as of January 1 of the year
     in which the report is delivered which shall, as of such January 1, and on
     the basis of findings and data as of a date not more than four months prior
     to such January 1, identify the properties covered thereby and set forth as
     of such January 1: (a) the Proved Reserves attributable to such properties,
     (b) projections of the future rate of production, the future net revenues
     and the present value of future net revenues of production discounted at a
     rate per annum designated by the Determining Banks, (c) projections of
     reserves and the future rate of production of gas plant products, the
     future net income from gas plant interests and the present value of the
     future net income from the gas plant interests discounted at a rate per
     annum designated by the Determining Banks, and (d) the price assumptions,
     which shall be designated by the Determining Banks, used in arriving at the
     value of future net revenues and future net income.
 
          "Eurodollar Lending Office" -- Initially, the office of a Bank
     designated as such and set forth with its signature below, and thereafter
     such other office of such Bank, if any, of which such Bank shall notify the
     Agent and the Company in writing.
 
          "Eurodollar Loans" -- Loans hereunder at such time as they bear
     interest at a rate based upon the Eurodollar Rate.
 
          "Eurodollar Rate" -- With respect to any Interest Period pertaining to
     a Eurodollar Loan, the quotient obtained by dividing (a) the applicable
     Interbank Rate by (b) 1.00 minus that percentage (expressed as a decimal)
     which is prescribed by the Board of Governors of the Federal Reserve System
     (or any successor) for determining the reserve requirement for a member
     bank of the Federal Reserve System in New York City with deposits exceeding
     $1,000,000,000 in respect of Eurocurrency liabilities having a maturity
     comparable to such Interest Period and in an amount comparable to that
     portion of the Eurodollar Loans of Chemical to which such Interest Period
     applies (such Eurodollar Rate to be adjusted to the next higher 1/100 of
     1%). The percentage referred to in clause (b) of the immediately preceding
     sentence shall be adjusted automatically on and as of the effective date of
     any change in the reserve requirement referred to in such clause (b).
 
          "Event of Default" -- Any of the events of default set forth in
     Article VI.
 
          "Extension Agreement" -- Any of the extension agreements in
     substantially the form attached hereto as Exhibit B.
 
          "Hydrocarbons" -- Oil, gas and other liquid or gaseous hydrocarbons.
 
          "Indebtedness" -- Any indebtedness which: is for money borrowed;
     represents the deferred purchase price of property or assets purchased,
     except trade accounts payable in the ordinary course of business; is in
     respect of a capitalized lease, an advance payment or production payment;
     or is in respect of a guarantee of any of the foregoing obligations of
     another Person.
 
                                        3
<PAGE>   7
 
          "Independent Engineer" -- A Person appointed by the Board of Directors
     of the Company and acceptable to the Determining Banks who is engaged in
     engineering work or business who is in fact independent and does not have
     any substantial interest, direct or indirect, in the Company, but such
     Person may be regularly retained by the Company. If such Person is an
     individual, he shall not be a director, officer or employee of the Company.
     If such Person is a partnership or a corporation, it shall not have a
     partner, director or officer who is a director, officer or employee of the
     Company.
 
          "Interbank Rate" -- The average offered rate quoted to the Reference
     Banks in the London Interbank Eurodollar Market as of 10:00 A.M. (New York
     City time) two Working Days immediately preceding the commencement of the
     Interest Period for a Eurodollar Loan for deposits in United States dollars
     in an amount comparable to the Eurodollar Loan of Chemical to which such
     Interest Period applies and for a period of time comparable to such
     Interest Period.
 
          "Interest Payment Date" -- (a) As to any Reference Rated Loan, the end
     of any quarter with respect thereto and the Maturity Date, (b) as to any
     Eurodollar Loan, the last day of the Interest Period with respect thereto,
     and, for Interest Periods longer than 3 months, each date which is 3
     months, or a whole multiple thereof, from the first day of such Interest
     Period and (c) as to any CD Rated Loan, the last day of the Interest Period
     with respect thereto, and, for Interest Periods of 180 days, the date which
     is 90 days from the first day of such Interest Period.
 
          "Interest Period" -- (a) With respect to any Eurodollar Loan:
 
             (i) initially, the period commencing on the Borrowing Date or
        conversion date, as the case may be, with respect to such Eurodollar
        Loan and ending 1, 2, 3, 6 or, to the extent funds are available, as
        determined by the Agent, 9 months thereafter, as selected by the Company
        in its notice of borrowing or notice of conversion, as the case may be,
        given with respect thereto; and
 
             (ii) thereafter, each period commencing on the last day of the next
        preceding Interest Period applicable to such Eurodollar Loan and ending
        1, 2, 3, 6 or, to the extent funds are available, as determined by the
        Agent, 9 months thereafter, as selected by the Company by irrevocable
        notice to the Agent not less than two Working Days prior to the last day
        of the then current Interest Period with respect thereto; and
 
          (b) with respect to any CD Rated Loan:
 
             (i) initially, the period commencing on the Borrowing Date or
        conversion date, as the case may be, with respect to such CD Rated Loan
        and ending 30, 60, 90 or 180 days thereafter, as selected by the Company
        in its notice of borrowing or notice of conversion, as the case may be,
        given with respect thereto; and
 
             (ii) thereafter, each period commencing on the last day of the next
        preceding Interest Period applicable to such CD Rated Loan and ending
        30, 60, 90 or 180 days thereafter, as selected by the Company by
        irrevocable notice to the Agent on the last day of the then current
        Interest Period with respect thereto;
 
     provided that, the foregoing provisions relating to Interest Periods are
     subject to the following:
 
             (A) the Company shall have no right to elect an Interest Period
        which would extend beyond the Maturity Date;
 
             (B) if any Interest Period pertaining to a Eurodollar Loan would
        otherwise end on a day which is not a Working Day, that Interest Period
        shall be extended to the next succeeding Working Day unless the result
        of such extension would be to carry such Interest Period into another
        calendar month in which event such Interest Period shall end on the
        immediately preceding Working Day;
 
             (C) if any Interest Period pertaining to a CD Rated Loan would
        otherwise end on a day which is not a Business Day, such Interest Period
        shall be extended to the next succeeding Business Day;
 
                                        4
<PAGE>   8
 
             (D) any Interest Period pertaining to a Eurodollar Loan that begins
        on the last Working Day of a calendar month (or on a day for which there
        is no numerically corresponding day in the calendar month at the end of
        such Interest Period) shall end on the last Working Day of a calendar
        month;
 
             (E) if any Interest Period would otherwise extend beyond the (i)
        Maturity Date or (ii) date an amount or amounts are required to be
        repaid pursuant to Section 2.07, then (1) the Interest Period for the
        principal amount (if any) of each Loan required to be repaid on such
        date shall end on such date and (2) the remainder (if any) of each such
        Loan shall have an Interest Period determined as set forth above; and
 
             (F) for purposes of determining the availability of 9 month
        Interest Periods in respect of Eurodollar Loans, such Interest Periods
        shall be deemed available if (1) each of the Reference Banks quotes a
        rate to the Agent as provided in the definition of Eurodollar Rate and
        (2) the Majority Banks shall not have advised the Agent that the
        Eurodollar Rate determined by the Agent on the basis of such quotes will
        not adequately and fairly reflect the cost to such Banks of maintaining
        or funding their Eurodollar Loans for such Interest Period.
 
          "Lien" -- Any mortgage, pledge, security interest, encumbrance, lien
     or charge of any kind, including, without limitation, any conditional sale
     or other title retention agreement, any lease in the nature thereof and the
     filing of or agreement to give any financing statement under the Uniform
     Commercial Code of any jurisdiction and, in the case of any production
     payment, the right, title and interest of the owner of such production
     payment in the Mineral Interests out of the production from which such
     production payment is payable.
 
          "Loan" -- As the context may require, any CD Rated Loan, Eurodollar
     Loan or Reference Rated Loan.
 
          "Majority Banks" -- At any time, Banks holding at least 66 2/3% of the
     then aggregate unpaid principal amount of the Notes held by Banks or, if no
     such principal amount is then outstanding, Banks having at least 66 2/3% of
     the Commitments; provided, however, that the term Majority Banks as used in
     Section 2.16 shall mean, at any time, Banks holding at least 75% of the
     then aggregate unpaid principal amount of the Notes held by Banks or, if no
     such principal amount is then outstanding, Banks having at least 75% of the
     Commitments.
 
          "Maturity Date" means the second anniversary of the Termination Date
     or, if such day is not a Working Day, the next succeeding Working Day
     unless such Working Day falls in another calendar month, in which case the
     Maturity Date shall be the next preceding Working Day.
 
          "Mineral Interests" -- Leasehold and other interests in or under oil,
     gas and other mineral leases, mineral fee interests, overriding royalty and
     royalty interests and any other interests in Hydrocarbons and other
     minerals in place.
 
          "Moodys" -- Moody's Investors Service, Inc.
 
          "Net Proceeds" -- (a) The gross fair market value of the consideration
     or other amounts payable to or receivable by the Company in respect of any
     sales, transfers, distributions (other than cash dividends) or other
     dispositions of assets or properties other than (i) in the ordinary course
     of business, (ii) from the Company to a wholly owned subsidiary or (iii)
     from a subsidiary of the Company to the Company or a wholly owned
     subsidiary, less (b) the amount, if any, of all foreign and domestic taxes
     (but including income taxes only to the extent the Company reasonably
     estimates that such income taxes will be paid as a result of the federal
     income tax return or any state income tax return filed by the Company for
     the year in which the transaction takes place), and reasonable and
     customary fees, commissions, costs and other expenses which are incurred in
     connection with such sales, transfers or other dispositions and are payable
     by the seller or the transferor of the assets or property to which such
     sales, transfers or other dispositions relate, but only to the extent not
     already deducted in arriving at the amount referred to in clause (a).
 
                                        5
<PAGE>   9
 
          "Note" -- Any of the promissory notes of the Company payable to the
     order of any Bank in substantially the form attached hereto as Exhibit A.
 
          "Other Credit Agreement" -- means the $250,000,000 Revolving Credit
     Agreement, dated as of the date hereof, among the Company, the banks listed
     therein and Chemical, as agent for such banks, as the same may be amended,
     modified, supplemented or restated, from time to time, in accordance with
     the terms thereof.
 
          "Person" -- Any individual, corporation, partnership, joint venture,
     association, joint-stock company, trust, unincorporated organization or
     government or any agency or political subdivision thereof.
 
          "Proved Reserves" -- The estimated quantities of Hydrocarbons which
     geological and engineering data demonstrate with reasonable certainty to be
     recoverable in future years from known reservoirs under existing economic
     and operating conditions.
 
          "Public Indenture" -- The Indenture, dated as of May 10, 1988, between
     the Company and Continental Illinois National Bank and Trust Company of
     Chicago (now known as Continental Bank N.A.), as Trustee, as amended by the
     First Supplemental Indenture, dated as of November 15, 1991, between the
     Company and Continental Bank N.A.
 
          "Reference Banks" -- Chemical and Mellon Bank, N.A.
 
          "Reference Rate" -- The rate of interest publicly announced by
     Chemical from time to time in the City of New York as its reference rate.
     The reference rate is not intended to be the lowest rate of interest
     charged by Chemical in connection with extensions of credit to debtors.
 
          "Reference Rated Loans" -- Loans hereunder at such time as they bear
     interest at a rate based upon the Reference Rate.
 
          "Reserve Percentage" -- For any day during any Interest Period
     pertaining to a CD Rated Loan, that percentage (expressed as a decimal)
     which is in effect on such day, as prescribed by the Board of Governors of
     the Federal Reserve System (or any successor) for determining the reserve
     requirement for a member bank of the Federal Reserve System in the City of
     New York with deposits exceeding $1,000,000,000 in respect of new
     non-personal time deposits in dollars in the City of New York having a
     maturity comparable to the portion of the CD Rated Loans to which such
     Interest Period applies and in an amount of $100,000 or more.
 
          "S&P" -- Standard & Poor's Corporation.
 
          "Termination Date" -- May 23, 1995 or such later date to which the
     Termination Date shall have been extended pursuant to Section 2.05(c), or,
     if such day is not a Working Day, the next preceding Working Day; provided,
     however, that the Termination Date shall in no event be later than June 30,
     1999.
 
          "Tranche" -- The collective reference to Loans (other than Reference
     Rated Loans) of the same Type the then current Interest Periods with
     respect to all of which begin on the same date and end on the same later
     date (whether or not such Loans shall originally have been made on the same
     day).
 
          "Type" -- As to any Loan, its nature as a Reference Rated Loan, a CD
     Rated Loan or a Eurodollar Loan.
 
          "Working Day" -- A day on which banks are open for business in the
     City of New York and in London and dealings are carried out in the London
     Interbank Eurodollar Market.
 
     SECTION 1.02. Use of Defined Terms. Any defined term used in the plural
preceded by the definite article shall be taken to encompass all members of the
relevant class. Any defined term used in the singular preceded by "any" shall be
taken to indicate any number of the members of the relevant class.
 
     SECTION 1.03. Accounting Terms. All accounting terms not specifically
defined herein shall be construed in each case in accordance with generally
accepted accounting principles as in effect on the date of this Agreement.
 
                                        6
<PAGE>   10
 
                                   ARTICLE II
 
                           AMOUNT AND TERMS OF LOANS
 
     SECTION 2.01. Loans. (a) Subject to the terms and conditions of this
Agreement, each Bank severally agrees to make revolving credit Loans to the
Company from time to time during the period from the Effective Date to, and
including, the Termination Date in an aggregate principal amount at any one time
outstanding not to exceed its Commitment. The Company may use the Commitments by
repaying and prepaying the Loans in whole or in part, and on or prior to the
Termination Date, borrowing and reborrowing, all in accordance with the terms
and conditions hereof.
 
     (b) The Loans may be (i) Eurodollar Loans, (ii) Reference Rated Loans,
(iii) CD Rated Loans or (iv) a combination thereof, as determined by the Company
and notified to the Agent in accordance with Sections 2.03 and 2.22. Eurodollar
Loans shall be made and maintained by each Bank at either a Eurodollar Lending
Office or a Domestic Lending Office, at its option.
 
     SECTION 2.02. Notes. (a) Loans made by each Bank pursuant hereto shall be
evidenced by an appropriate Note, payable to the order of such Bank and
representing the obligation of the Company to pay the amount of the Commitment
of such Bank or, if less, the aggregate unpaid principal amount of all Loans
made by such Bank, with interest thereon as prescribed in Section 2.09. Each
Note shall (i) be dated the Effective Date, (ii) mature on the Maturity Date and
(iii) bear interest for the period from the date thereof until paid in full on
the unpaid principal amount thereof from time to time outstanding at the
applicable interest rate per annum determined as provided in Section 2.09 and
payable as specified in Section 2.09(e). Each Bank is hereby authorized to
record the date, Type and amount of each Loan made by such Bank pursuant to
Section 2.01, each continuation thereof, each conversion of all or a portion
thereof to another Type, and the date and amount of each repayment or prepayment
of principal thereof, on the schedule annexed to and constituting a part of its
Note, and any such recordation shall constitute prima facie evidence of the
accuracy of the information so recorded.
 
     (b) Each Bank shall, at the request of the Company, deliver to the Company
copies of the Notes and the schedules annexed thereto.
 
     SECTION 2.03. Procedure for Borrowing. The Company may borrow on any
Working Day if the borrowing (or any portion thereof) consists of Eurodollar
Loans or on any Business Day if the borrowing consists entirely of Domestic
Loans; provided that the Company shall give the Agent notice not later than (i)
two Working Days prior to the Borrowing Date, in the case of Eurodollar Loans,
and (ii) the Borrowing Date, in the case of Domestic Loans. Such notice shall
specify (i) the amount to be borrowed, (ii) the Borrowing Date, (iii) whether
the borrowing is to consist of Eurodollar Loans, Reference Rated Loans, CD Rated
Loans or a combination thereof (in each case stating the amounts requested), and
(iv) except in the case of Reference Rated Loans, the length of the Interest
Period(s) therefor. Each borrowing shall be in an aggregate principal amount not
less than (i) in the case of Reference Rated Loans, the lesser of (A)
$10,000,000 or a whole multiple of $5,000,000 in excess thereof and (B) the then
unused Commitments or (ii) in the case of CD Rated Loans or Eurodollar Loans,
$10,000,000 or a whole multiple of $5,000,000 in excess thereof. Upon receipt of
such notice, the Agent shall promptly notify each Bank thereof. Each Bank will
make the amount of its pro rata share of each borrowing available to the Agent
for the account of the Company at the office of the Agent designated by the
Agent in the Agent's notice aforesaid prior to 11:30 A.M. (according to the time
of the place where such office of the Agent is located) on the Borrowing Date
requested by the Company in funds immediately available to the Agent as the
Agent may direct. The proceeds of each such borrowing will then be made
available to the Company by the Agent crediting the account of the Company on
the books of the Agent with the aggregate amount made available to the Agent by
the Banks and in like funds as received by the Agent.
 
     SECTION 2.04. Commitment Fees. (a) Subject to subsection (b) of this
Section, the Company agrees to pay to the Agent for the account of each Bank a
commitment fee from the Effective Date to, but not including, the Termination
Date or such earlier date upon which the Commitments shall terminate or be
reduced to zero pursuant to Section 2.05 or 6.01, computed at the rate of
12.50/100 of 1% per annum (or, in the
 
                                        7
<PAGE>   11
 
case of each day on which the ratings by Moodys and S&P of the Company's long
term senior unsecured debt are (i) in neither case greater than, but not both
less than, "BBB-" or equivalent rating, 17.50/100 of 1% per annum or (ii) both
less than "BBB-" or equivalent rating, 22.50/100 of 1% per annum, provided that
for purposes of this Section 2.04(a), in the event that a rating is not
available from either Moodys or S&P, such rating agency shall be deemed to have
assigned its lowest rating) on an amount equal to the average daily unused
portion of the Commitments in effect for the period for which payment is made.
 
     (b) If any Bank shall become a Defaulting Bank, then, notwithstanding
subsection (a) above and without prejudicing any right or remedy that the
Company may have with respect to, on account of, arising from or relating to any
event pursuant to which such Bank shall be a Defaulting Bank, no commitment fee
shall accrue for the account of such Bank from and after the date upon which
such Bank shall have become a Defaulting Bank.
 
     (c) Commitment fees shall be payable quarterly in arrears on the last day
of each March, June, September and December, commencing on June 30, 1994, and on
the Termination Date or such earlier date as the Commitments shall terminate or
be reduced to zero as provided herein.
 
     SECTION 2.05. Reduction, Termination or Extension of Commitments. (a) The
Company shall have the right, upon not less than two Business Days' notice to
the Agent, to terminate the Commitments or, from time to time, reduce the amount
of the Commitments. Any reduction shall be accompanied by prepayment of the
Loans to the extent, if any, that the Loans then outstanding exceed the amount
of the Commitments as then reduced. Any termination of the Commitments shall be
accompanied by prepayment in full of the Loans then outstanding and the payment
of any unpaid commitment fees then accrued hereunder. Upon receipt of such
notice, the Agent shall promptly notify each Bank thereof. Any reduction shall
be in an amount of $5,000,000 or a whole multiple thereof and shall reduce
permanently the amount of the Commitments then in effect. The Commitments once
terminated or reduced may not be reinstated.
 
     (b) If during any calendar year the Company or its subsidiaries shall
receive Net Proceeds from the sale, transfer, distribution or other disposition
of property identified in the most recent Engineer's Opinion delivered pursuant
to Section 4.01 in an aggregate amount in excess of $50,000,000, the Borrowing
Base shall be reduced by the amount of such excess, each such reduction to occur
on the date of receipt by the Company or its subsidiaries of such excess amount.
 
     (c) Extension of Commitments. The Commitments may be extended in the manner
set forth in this subsection (c), in each case for a period of 364 days from the
date on which Banks having 100% of the Commitments (after giving effect to any
assignments or terminations referred to in the fourth sentence of this
subsection (c)) shall have executed an Extension Agreement as provided herein
(the "Extension Date"). If the Company wishes to request an extension of the
Commitments, it shall give notice to that effect to the Agent not less than 30
nor more than 60 days prior to the Termination Date then in effect, whereupon
the Agent shall promptly notify each of the Banks of such request. Each Bank
will use its best efforts to respond to such request, whether affirmatively or
negatively, as it may elect in its sole discretion, within 20 days of such
notice to the Agent. If less than all Banks respond affirmatively to such
request within 20 days, then the Company may (i) require the Banks that do not
elect to extend their Commitments to assign their Commitments in their entirety
to one or more assignees, mutually satisfactory to the Company and to the Agent,
no later than 15 days prior to the Termination Date then in effect, which
assignees will agree to extend such Commitment and (ii) if Banks holding at
least 80% of the Commitments then outstanding (including assignees that shall
have become Banks pursuant to clause (i) above) shall have agreed to extend
their respective Commitments, the Company may, with effect from the Extension
Date, terminate the Commitments of the Banks that shall not have agreed to so
extend and prepay all Loans and other amounts then owing to any such Banks, in
each case in accordance with Section 8.06(a) hereof. If all Banks (including
such assignees, excluding their respective transferor Banks, and excluding all
such Banks whose Commitments have been so terminated) respond affirmatively,
then, subject to receipt by the Agent of counterparts of an Extension Agreement
in substantially the form of Exhibit B hereto duly completed and signed by all
of the parties thereto, the Commitments shall be extended for the period
specified above. Such Extension Agreement shall be executed and delivered no
earlier than 5 days prior to the Termination Date then in effect,
 
                                        8
<PAGE>   12
 
and no extension of the Commitments pursuant to this subsection (c) shall be
legally binding on any party hereto unless and until such Extension Agreement is
so executed and delivered and accepted by the Company.
 
     (d) All outstanding Commitments shall terminate on the Termination Date.
 
     SECTION 2.06. Optional Prepayments. (a) The Company may, at its option, as
provided in this Section 2.06, at any time and from time to time prepay the
Loans, in whole or in part, upon at least two Business Days' prior notice to the
Agent, specifying (i) the date and amount of prepayment and (ii) the respective
amounts to be prepaid in respect of Reference Rated Loans, CD Rated Loans and
Eurodollar Loans. Upon receipt of such notice, the Agent shall promptly notify
each Bank thereof. The payment amount specified in such notice shall be due and
payable on the date specified. All prepayments pursuant to this Article II shall
include accrued interest on the amount prepaid to the date of prepayment and, in
the case of prepayments of Eurodollar Loans and CD Rated Loans, any amounts
payable pursuant to Section 2.20. The Loans shall also be subject to prepayment
as provided in Sections 2.05, 2.07, 2.12, 2.13 and 8.06.
 
     (b) Partial optional prepayments pursuant to this Section 2.06 shall be in
an aggregate principal amount of $10,000,000 or any whole multiple of $5,000,000
in excess thereof. All prepayments of Loans pursuant to this Article II shall be
without the payment by the Company of any premium or penalty except for amounts
payable pursuant to Section 2.20.
 
     SECTION 2.07. Mandatory Prepayments. (a) If at any time prior to the
Termination Date the aggregate outstanding principal amount of the Loans exceeds
the Commitments, the Company shall prepay the Loans in an amount equal to such
excess.
 
     (b) If at any time the Available Borrowing Base is less than zero, the
Company shall prepay Indebtedness in an amount at least sufficient to cause the
Available Borrowing Base to be equal to zero. If any amount is required to be
prepaid pursuant to this subsection (b) as a result of a decrease in the
Borrowing Base, the Company shall pay such amount in no more than six equal
monthly installments, payable on the fifteenth day of each calendar month,
commencing on the first such day to occur after the date of any determination
that a prepayment is required pursuant to this subsection (b).
 
     (c) Each prepayment of Loans pursuant to this Section 2.07 shall be
accompanied by payment of accrued interest on the amount prepaid to the date of
prepayment and, in the case of prepayments of Eurodollar Loans and CD Rated
Loans, any amounts payable pursuant to Section 2.20.
 
     SECTION 2.08. Repayment of Loans. The Company shall pay to the Agent for
the account of each Bank the unpaid principal amount of each Loan made by such
Bank on the Maturity Date.
 
     SECTION 2.09. Interest Rate. (a) Each Eurodollar Loan shall bear interest
for each day during each Interest Period with respect thereto on the unpaid
principal amount thereof at a rate per annum equal to the Eurodollar Rate for
such Interest Period plus 37.50/100 of 1%.
 
     (b) Each Reference Rated Loan shall bear interest on the unpaid principal
amount thereof at a fluctuating rate per annum equal to the Reference Rate.
 
     (c) Each CD Rated Loan shall bear interest for each day during each
Interest Period with respect thereto on the unpaid principal amount thereof at a
rate per annum equal to the Adjusted CD Rate for such Interest Period plus
50/100 of 1%.
 
     (d) Any overdue principal of any Loan shall, without limiting the rights of
any Bank under Article VI, bear interest at a rate per annum which is 1% above
the rate which would otherwise be applicable to such Loan pursuant to
subsections (a), (b) and (c) of this Section 2.09 until paid in full (as well
after as before judgment).
 
     (e) Interest shall be payable on each Interest Payment Date.
 
     (f) Notwithstanding the foregoing, if on any day the sum of (i) the
aggregate principal amount of outstanding Loans and (ii) the aggregate principal
amount of loans outstanding under the Other Credit Agreement is greater than 50%
of the sum of (A) the aggregate Commitments hereunder and (B) the
 
                                        9
<PAGE>   13
 
aggregate commitments then existing under the Other Credit Agreement, each
Eurodollar Loan and CD Rated Loan shall bear interest, for such day, at a rate
per annum which is 12.50/100 of 1% above the rate which would otherwise be
applicable pursuant to subsections (a) and (c) of this Section 2.09.
 
     (g) Notwithstanding the foregoing, (i) if on any day neither of the ratings
by Moodys and S&P of the Company's long term senior unsecured debt is greater
than "BBB-" or equivalent rating, but such ratings are not both less than "BBB-"
or equivalent rating, Eurodollar and CD Rated Loans shall bear interest, for
such day, at a rate per annum which is 12.50/100 of 1% above the rate which
would otherwise be applicable pursuant to subsections (a), (c) and (f) of this
Section 2.09; or (ii) if on any day Moodys and S&P both rate the Company's long
term senior debt less than "BBB-" or equivalent rating, Eurodollar and CD Rated
Loans shall bear interest, for such day, at a rate per annum which is 25/100 of
1% above the rate which would otherwise be applicable pursuant to subsections
(a), (c) and (f) of this Section 2.09. For purposes of this Section 2.09, in the
event a rating is not available from either Moodys or S&P, such rating agency
will be deemed to have assigned its lowest rating.
 
     SECTION 2.10. Computation of Interest and Fees. (a) Interest on the
Reference Rated Loans and commitment fees shall be calculated on the basis of a
365-(or 366-as the case may be) day year for the actual days elapsed. Interest
on Eurodollar Loans and CD Rated Loans shall be calculated on the basis of a
360-day year for the actual days elapsed. The Agent shall notify the Company and
the Banks of each determination of a Eurodollar Rate and of an Adjusted CD Rate.
Any change in the interest rate resulting from a change in the Reference Rate
shall become effective as of the opening of business on the day on which such
change in the Reference Rate shall become effective. The Agent shall notify the
Company and the Banks of the effective date and the amount of each such change
in the Reference Rate.
 
     (b) The Agent shall, at the request of the Company, deliver to the Company
a statement showing the quotations given by the Reference Banks and the
computations used by the Agent in determining any interest rate pursuant to
subsection (a) or (c) of this Section 2.10.
 
     (c) If either of the Reference Banks shall be unable or shall otherwise
fail to notify the Agent of a rate, the interest rate shall be determined on the
basis of the rate notified by the other Reference Bank.
 
     SECTION 2.11. Pro Rata Treatment and Payments. Each borrowing by the
Company from the Banks, each payment (including each prepayment) by the Company
on account of the principal of and interest on the Loans and on account of any
commitment fees hereunder and any reduction of the Commitments of the Banks
hereunder shall be made pro rata according to the Commitments, except that (i)
payments or prepayments, and offsets against or reductions from the amount of
payments and prepayments, in each case, specifically for the account of a
particular Bank under the terms of Section 2.04, 2.05, 2.12, 2.13, 2.20 or 8.06
shall be made for the account of such Bank and (ii) if any Bank shall become a
Defaulting Bank, from and after the date upon which such Bank shall have become
a Defaulting Bank, any payment made on account of principal of or interest on
the Loans shall be applied, first for the account of the Banks other than the
Defaulting Bank, pro rata according to the Commitments of such Banks, until the
principal of and interest on the Loans of such Banks shall have been paid in
full and, second for the account of such Defaulting Bank, provided that the
application of such payments in accordance with this clause (ii) shall not
constitute an Event of Default or an event which with the giving of notice or
the passage of time, or both, would constitute an Event of Default, and no
payment of principal of or interest on the Loans of such Defaulting Bank shall
be considered to be overdue for purposes of Section 2.09(d) hereof, if, had such
payments been applied without regard to this clause (ii), no such Event of
Default or event which with the giving of notice or the passage of time, or
both, would constitute an Event of Default would have occurred and no such
payment of principal of or interest on the Loans of such Defaulting Bank would
have been overdue. All payments (including prepayments) to be made by the
Company on account of principal, interest and commitment fees shall be made
without setoff or counterclaim and shall be made to the Agent on behalf of the
Banks at the Agent's office located at (a) 270 Park Avenue, New York, New York
10017 at or before 12:00 noon (New York City time) in the case of Domestic Loans
and commitment fees, for the account of the Domestic Lending Offices of the
Banks and (b) 4 New York Plaza, New York, New York 10015 at or before 12:00 noon
(New York City time) in the case of Eurodollar Loans, for the account of the
Eurodollar Lending Offices or Domestic
 
                                       10
<PAGE>   14
 
Lending Offices, as the case may be, of the Banks which shall then be
maintaining Eurodollar Loans, in each case in lawful money of the United States
of America and in immediately available funds. The Agent shall distribute such
payments to the Banks promptly upon receipt in like funds as received.
 
     If any payment hereunder (other than payments on the Eurodollar Loans)
becomes due and payable on a day other than a Business Day, such payment shall
be extended to the next succeeding Business Day, and with respect to payments of
principal, interest thereon shall be payable at the then applicable rate during
such extension. If any payment on a Eurodollar Loan becomes due and payable on a
day other than a Working Day, the maturity thereof shall be extended to the next
succeeding Working Day unless the result of such extension would be to extend
such payment into another calendar month in which event such payment shall be
made on the immediately preceding Working Day. Each Bank is authorized to and
shall endorse the date, Type and amount of each Loan made by such Bank, each
continuation thereof, each conversion of all or a portion thereof to another
Type, and the date and amount of each payment of principal with respect thereto
on the schedule annexed to and constituting a part of its Note. No failure to
make or error in making any such endorsement as authorized hereby shall affect
the validity of the obligations of the Company to repay the unpaid principal
amount of the Loans with interest thereon as provided in Section 2.09 or the
validity of any payment thereof made by the Company.
 
     Except as provided in Sections 2.04(b), 2.05, 2.12, 2.13, 2.20, 8.06 and
this Section 2.11, if the holder of any Note shall obtain any payment (whether
voluntary, involuntary, by application of offset or otherwise) upon principal of
or interest on such Note in excess of its pro rata share of payments obtained by
all holders upon principal of and interest on such Notes then held by them, such
holder shall purchase from the other holders such participation in such Notes
held by them as shall be necessary to cause such purchasing holder to share the
excess payment ratably with each of them; providing however, that if all or any
portion of the excess payment is thereafter recovered from such purchasing
holder, the purchase shall be rescinded and the purchase price restored to the
extent of such recovery, but without interest.
 
     The following subsection (a) of Section 2.12 and subsection (b) of Section
2.15 shall be applicable to Eurodollar Loans and CD Rated Loans only and the
following Section 2.13 and subsection (a) of Section 2.15 shall be applicable to
Eurodollar Loans only.
 
     SECTION 2.12. Increased Cost of Loans. (a) In the event of any change in
any applicable law, treaty or governmental regulation after the date of this
Agreement, or in the interpretation or application thereof after the date of
this Agreement, or compliance by any Bank with any request or directive (whether
or not having the force of law) from any central bank or other governmental
authority made or issued after the date of this Agreement, which:
 
          (i) does or shall subject such Bank to any tax of any kind whatsoever
     (including, without limitation, withholding taxes) with respect to this
     Agreement, any Note or any Eurodollar or CD Rated Loan, or change the basis
     of taxation of payments to such Bank of principal, commitment fees, penalty
     fees, interest or any other amount payable hereunder (except for changes in
     the rate of tax on the overall net income of such Bank);
 
          (ii) does or shall impose, modify or hold applicable any reserve,
     special deposit, compulsory loan or similar requirement against assets held
     by, or deposits or other liabilities in or for the account of, advances or
     loans by, or other credit extended by, or any other acquisition of funds
     by, any office of such Bank (in excess, and without duplication, of those
     taken into account in computing the Eurodollar Rate for any Eurodollar
     Interest Period, the Reserve Percentage and the Assessment Rate); or
 
          (iii) does or shall impose on such Bank any other condition;
 
and the result of any of the foregoing is to increase the cost to such Bank of
making, converting into, continuing or maintaining Eurodollar Loans or CD Rated
Loans or to reduce any amount receivable hereunder with respect to Eurodollar
Loans or CD Rated Loans, then, in any such case, the Company shall pay such
Bank, upon written demand being made to the Company by such Bank, such
additional amount which will compensate such Bank for such amounts as that Bank
reasonably deems to be material with respect
 
                                       11
<PAGE>   15
 
to this Agreement, the Notes or the Loans hereunder, provided, however, that if
all or any such additional cost would not have been payable, or such reduction
would not have occurred, but for such Bank's decision to designate a new
Eurodollar Lending Office or refusal to change to another Eurodollar Lending
Office as provided below, the Company shall have no obligation under this
Section 2.12 to compensate such Bank for such amount. Such demand shall be
accompanied by a certificate of a duly authorized officer of such Bank setting
forth the amount of such payment and the basis therefor, which certificate shall
be prima facie evidence of the amount of such payment. Each Bank shall also give
written notice to the Company and the Agent of any event occurring after the
date of this Agreement which would entitle such Bank to compensation pursuant to
this Section 2.12 as promptly as practicable after it obtains knowledge thereof
and determines to request such compensation and will designate a different
Eurodollar Lending Office if such designation will avoid the need for, or reduce
the amount of, such compensation and will not, in the sole opinion of such Bank,
be disadvantageous to such Bank. Notwithstanding the foregoing, in the event
that any Bank shall demand payment pursuant to this Section 2.12, the Company
may, upon at least two Business Days' notice to the Agent and such Bank, convert
in whole (but not in part) the Eurodollar Loans or CD Rated Loans, as the case
may be, of such Bank, into Loans of another Type without regard to the
requirements of Section 2.22 (other than clause (i) of the proviso to the last
sentence of subsection (a) thereof).
 
     (b) In the event that any Bank shall have reasonably determined that the
adoption after the date of this Agreement of any law, rule or regulation
regarding capital adequacy, or any change therein or in the interpretation or
application thereof after the date of this Agreement or compliance by any Bank
with any request or directive regarding capital adequacy (whether or not having
the force of law) from any central bank or governmental authority made or issued
after the date of this Agreement, does or shall have the effect of reducing the
rate of return on such Bank's capital as a consequence of its obligations
hereunder to a level below that which such Bank could have achieved but for such
adoption, change or compliance (taking into consideration such Bank's policies
with respect to capital adequacy) by an amount reasonably deemed by such Bank to
be material, then from time to time, after submission by such Bank to the
Company (with a copy to the Agent) of a written request therefor, the Company
shall pay to such Bank such additional amount or amounts as will compensate such
Bank for such reduction from and after such date the Company receives the
request; provided, however, that the foregoing shall not apply to any capital
adequacy requirement imposed solely by reason of any business combination
effected after the date hereof.
 
     SECTION 2.13. Illegality. Notwithstanding anything herein contained, if any
Bank shall make a good faith determination that a change in any applicable law
or regulation or in the interpretation thereof by any authority charged with the
administration thereof shall make it unlawful for such Bank to give effect to
its obligations to make, convert into, continue or maintain its Eurodollar Loans
under this Agreement, the obligation of such Bank to make, convert into,
continue or maintain Eurodollar Loans hereunder shall be suspended for the
duration of such illegality. Such Bank, by written notice to the Agent and to
the Company, shall declare that such Bank's obligation to make, convert into,
continue and maintain Eurodollar Loans shall be suspended, and the Company, on
the last day of the then current Interest Period applicable to such Eurodollar
Loans or portion thereof or, if the Bank so requests, on such earlier date as
may be required by relevant law, shall convert such Eurodollar Loans or portion
thereof into Loans of another Type, without regard to the requirements of
Section 2.22 (other than clause (i) of the proviso to the last sentence of
subsection (a) thereof). If and when such illegality ceases to exist, such
suspension shall cease and such Bank shall notify the Company and the Agent
thereof and any Loans previously converted from Eurodollar Loans to Loans of a
different Type pursuant to this Section 2.13 shall be converted into Loans of
Types corresponding to the Loans maintained by the other Banks on the last day
of the Interest Period of the corresponding Eurodollar Loans of the other Banks
unless, in the case of a conversion of CD Rated Loans, the Company shall have
elected, by notice to the Agent, not to convert such CD Rated Loans until the
last day of the then current Interest Period with respect thereto, in which
case, such CD Rated Loans shall be converted at such time as the Company may
elect in accordance with Section 2.22.
 
     SECTION 2.14. Withholding Tax Exemption. At least five Business Days prior
to the first date on which interest or fees are payable hereunder for the
account of any Bank, each Bank that is not incorporated under the laws of the
United States of America or a state thereof agrees that it will deliver to each
of the
 
                                       12
<PAGE>   16
 
Company and the Agent two duly completed copies of United States Internal
Revenue Service Form 1001 or 4224, certifying in either case that such Bank is
entitled to receive payments under this Agreement and the Notes without
deduction or withholding of any United States federal income taxes. Each Bank
which so delivers a Form 1001 or 4224 further undertakes to deliver to each of
the Company and the Agent two additional copies of such form (or a successor
form) on or before the date that such form expires or becomes obsolete or after
the occurrence of any event requiring a change in the most recent form so
delivered by it, and such amendments thereto or extensions or renewals thereof
as may be reasonably requested by the Company or the Agent, in each case
certifying that such Bank is entitled to receive payments under this Agreement
and the Notes without deduction or withholding of any United States federal
income taxes, unless an event (including without limitation any change in
treaty, law or regulation) has occurred prior to the date on which any such
delivery would otherwise be required which renders all such forms inapplicable
or which would prevent such Bank from duly completing and delivering any such
form with respect to it and such Bank advises the Company and the Agent that it
is not capable of receiving payments without any deduction or withholding of
United States federal income tax.
 
     SECTION 2.15. Substitute Loan Basis. (a) In the event that the Majority
Banks shall reasonably determine (which determination shall be final and
conclusive and binding upon the Company) at any time that (i) by reason of
changes affecting the London Interbank Eurodollar Market, adequate and fair
means do not exist for ascertaining the rate of interest applicable to any
Tranche of Eurodollar Loans for any requested Interest Period or (ii) the making
of, converting into or continuing for an additional Interest Period of any
Tranche of Eurodollar Loans has been made impracticable by the occurrence of a
contingency which materially and adversely affects the London Interbank
Eurodollar Market then, and in any such event, the Agent shall forthwith give
notice to the Company and, subject to the provisions of subsection (b) of this
Section 2.15 (x) unless on the date upon which such Eurodollar Loans were to be
made the Company notifies the Agent that it elects not to borrow on such date,
any Eurodollar Loans requested to be made on the first day of such Interest
Period shall be made as Reference Rated Loans or CD Rated Loans, as requested by
the Company by notice (setting forth, in the case of any request that such Loans
be made as CD Rated Loans, the initial Interest Period with respect thereto) to
the Agent on the date upon which such Loans are to be made, or, in the absence
of any such request, as Reference Rated Loans, (y) any Loans that were to have
been, on the first day of such Interest Period, converted to or continued as
Eurodollar Loans shall be converted to or continued as Reference Rated Loans or
CD Rated Loans, as requested by the Company by notice (setting forth, in the
case of any request that such Loans be converted to or continued as CD Rated
Loans, the next Interest Period with respect thereto) to the Agent on the date
upon which such Loans were to have been converted or continued, or, in the
absence of any such request, as Reference Rated Loans, and (z) any outstanding
Eurodollar Loans shall be converted, on the last day of the Interest Period
applicable thereto, to Reference Rated Loans or CD Rated Loans, as requested by
the Company by notice (setting forth, in the case of any request that such Loans
be converted to CD Rated Loans, the initial Interest Period with respect
thereto) to the Agent on the date upon which such Loans are to be converted, or
in the absence of any such request, to Reference Rated Loans. The Agent shall
give written notice to the Company of any event occurring after the giving of
such notice which permits an adequate and fair means of ascertaining the rate of
interest applicable to Eurodollar Loans and until such notice by the Agent, no
further Eurodollar Loans shall be made or continued as such, nor shall the
Company have the right to convert Loans to Eurodollar Loans.
 
     (b) In the event that the Majority Banks shall reasonably determine (which
determination shall be final and conclusive and binding upon the Company) at any
time that (i) by reason of changes affecting the market for domestic
certificates of deposit of commercial banks, adequate and fair means do not
exist for ascertaining the rate of interest applicable to any Tranche of CD
Rated Loans for any requested Interest Period or (ii) the making of, converting
into or continuing for an additional Interest Period of any Tranche of CD Rated
Loans has been made impracticable by the occurrence of a contingency which
materially and adversely affects the market for domestic certificates of deposit
of commercial banks then, and in any such event, the Agent shall forthwith give
notice to the Company and, subject to the provisions of subsection (a) of this
Section 2.15 (x) unless on the date upon which such CD Rated Loans were to be
made, the Company notifies the Agent that it elects not to borrow on such date,
any CD Rated Loans requested to be made on the first day of such Interest Period
shall be made as Reference Rated Loans or Eurodollar Loans, as requested by the
Company
 
                                       13
<PAGE>   17
 
by notice (setting forth, in the case of any request that such Loans be made as
Eurodollar Loans, the initial Interest Period with respect thereto) to the Agent
on the date of or two Working Days before, as the case may be, such Loans are to
be made, or, in the absence of any such request, as Reference Rated Loans, (y)
any Loans that were to have been, on the first day of such Interest Period,
converted to or continued as CD Rated Loans shall be converted to or continued
as Reference Rated Loans or Eurodollar Loans, as requested by the Company by
notice (setting forth, in the case of any request that such Loans be converted
to or continued as Eurodollar Loans, the next Interest Period with respect
thereto) to the Agent on the date upon or two Working Days before, as the case
may be, such Loans were to have been converted or continued, or, in the absence
of any such request, as Reference Rated Loans and (z) any outstanding CD Rated
Loans shall be converted, on the last day of the Interest Period applicable
thereto, to Reference Rated Loans or Eurodollar Loans, as requested by the
Company by notice (setting forth, in the case of any request that such Loans be
converted to Eurodollar Loans, the initial Interest Period with respect thereto)
to the Agent on the date upon or two Working Days before, as the case may be,
the date upon which such Loans are to be converted, or, in the absence of any
such request, to Reference Rated Loans. The Agent shall give written notice to
the Company of any event occurring after the giving of such notice which permits
an adequate and fair means of ascertaining the rate of interest applicable to CD
Rated Loans and until such notice by the Agent, no further CD Rated Loans shall
be made or continued as such, nor shall the Company have the right to convert
Loans to CD Rated Loans.
 
     SECTION 2.16. Determination of Borrowing Base. On or before the date which
is the later of April 1 in each year and the date which is one month after the
date on which the Engineer's Opinion for such year is delivered to the Banks
pursuant to Section 4.01, the Determining Banks shall determine, based upon the
information, including information as to projected cash flows, contained in such
Engineer's Opinion, the Determining Banks' normal policy guidelines on price
parameters, cost escalations and discount and other factors customarily used by
each Determining Bank in evaluating energy and natural resource related credits,
a borrowing base. The borrowing base as determined shall be promptly
communicated to the other Banks, which shall promptly consider and approve or
disapprove the same, and upon approval of such determination by the Majority
Banks, by notice to the Agent, such borrowing base shall constitute the
"Borrowing Base." Such determination by the Determining Banks and such approval
or nonapproval by the Majority Banks shall be made in the sole and absolute
discretion of the Determining Banks and the Majority Banks, respectively. No
later than May 15 in each year or the date which is six weeks after the date on
which the Engineer's Opinion for such year is delivered to Banks pursuant to
Section 4.01, the Agent shall notify the Company of the Borrowing Base. If the
Agent fails to notify the Company, the Borrowing Base shall remain in effect
until the next succeeding calculation of the Borrowing Base in the manner
provided above.
 
     SECTION 2.17. Certain Prepayments or Conversions Pursuant to Sections 2.12
and 2.13. In the event that Loans of any Bank of one Type are prepaid or
converted into Loans of another Type pursuant to Sections 2.12 or 2.13 (Loans of
the former Type being herein called "Affected Loans"), unless and until such
Bank gives written notice that the circumstances which gave rise to such
prepayment or conversion no longer exist (which such Bank agrees to do promptly
upon such circumstances ceasing to exist) such Bank shall not make further
Affected Loans and all Loans which would otherwise be made by such Bank as, or
converted by such Bank into, Affected Loans shall be made instead as, or
converted into or continued as, Loans of another Type (on which interest and
principal shall be payable simultaneously with the related Affected Loans of the
other Banks).
 
     SECTION 2.18. Certain Notices. Notices by the Company under each of
Sections 2.03, 2.05, 2.06, 2.12, 2.15 and 2.22 and under the definition of
"Interest Period" in Section 1.01 (a) shall be given in writing, by telegraph,
by telecopy or by telephone (confirmed promptly in writing) and (b) shall be
effective only if received by the Agent and, in the case of Section 2.12, the
Bank involved, not later than 10:30 A.M. (New York City time) on the day
specified in the respective Section or definition as the latest day such notice
may be given. Notices by the Company under each of Sections 2.03, 2.05, 2.06,
2.12, 2.15 and 2.22 shall be irrevocable.
 
     SECTION 2.19. Use of Proceeds. The Company agrees that the proceeds of the
Loans obtained by the Company hereunder shall be used for its general corporate
purposes, including working capital needs, the
 
                                       14
<PAGE>   18
 
repayment of indebtedness and loans to subsidiaries and will not be used,
directly or indirectly, or for any other purpose which would result in a
violation of any law, rule or regulation, including Regulation U of the Board of
Governors of the Federal Reserve System, known to the Company.
 
     SECTION 2.20. Indemnity. The Company agrees to indemnify each Bank and to
hold such Bank harmless from any loss (other than loss of margin after the date
of such default or prepayment) or expense which such Bank may sustain or incur
as a consequence of (a) default by the Company in making a borrowing of,
conversion into or continuance of a Eurodollar Loan or CD Rated Loan after the
Company has given a notice requesting the same in accordance with this
Agreement, (b) default by the Company in making any prepayment of a Eurodollar
Loan or a CD Rated Loan after the Company has given a notice in accordance with
Section 2.06 or (c) the making by the Company of a prepayment or conversion of a
Eurodollar Loan or a CD Rated Loan on a day which is not the last day of the
Interest Period with respect thereto, arising from the reemployment of funds
obtained by it to maintain its Eurodollar Loans or CD Rated Loans hereunder or
from fees payable to terminate the deposits from which such funds were obtained.
This covenant shall survive termination of this Agreement and payment of the
Notes.
 
     SECTION 2.21. Minimum Amounts of Tranches. All borrowings, conversions and
continuations of Loans hereunder and all selections of Interest Periods
hereunder shall be in such amounts and be made pursuant to such elections so
that, after giving effect thereto, the aggregate principal amount of the Loans
comprising each Tranche shall be equal to $10,000,000 or a whole multiple of
$5,000,000 in excess thereof.
 
     SECTION 2.22. Conversion and Continuation Options. (a) The Company may
elect from time to time to convert Eurodollar Loans or CD Rated Loans to
Reference Rated Loans by giving the Agent irrevocable notice of such election on
the date of such conversion, provided that any such conversion may only be made
on the last day of an Interest Period with respect to the Loans being converted.
The Company may elect from time to time to convert Reference Rated Loans or
Eurodollar Loans to CD Rated Loans by giving the Agent irrevocable notice of
such election on the date of such conversion, provided that any such conversion
of Eurodollar Loans may only be made on the last day of an Interest Period with
respect thereto. The Company may elect from time to time to convert Reference
Rated Loans or CD Rated Loans to Eurodollar Loans by giving the Agent at least
two Working Days irrevocable notice of such election, provided that any such
conversion of CD Rated Loans may only be made on the last day of an Interest
Period with respect thereto. Any such notice of conversion to Eurodollar Loans
or CD Rated Loans shall specify the length of the initial Interest Period or
Interest Periods therefor. Upon receipt of any such notice, the Agent shall
promptly notify each Bank thereof. All or any part of outstanding Eurodollar
Loans, CD Rated Loans and Reference Rated Loans may be converted as provided
herein, provided that (i) no Loan may be converted into a Eurodollar Loan or a
CD Rated Loan at any time at which an Event of Default has occurred and is
continuing and (ii) any conversion may only be made if, after giving effect
thereto, Section 2.21 shall not have been contravened.
 
     (b) Any Eurodollar Loans or CD Rated Loans may be continued as such upon
the expiration of the then current Interest Period with respect thereto by the
Company giving notice to the Agent, in accordance with the applicable provisions
of the term "Interest Period" set forth in Section 1.1, of the length of the
next Interest Period to be applicable to such Loans, provided that (i) no Loan
may be continued as a Eurodollar Loan or a CD Rated Loan for an additional
Interest Period at any time at which an Event of Default has occurred or is
continuing and (ii) no Eurodollar Loan or CD Rated Loan may be continued as such
if, after giving effect thereto, Section 2.21 would be contravened and provided,
further, that if the Company shall fail to give any required notice as described
above in this section, or if such conversion is not permitted pursuant to the
preceding proviso hereof, such Loans shall be automatically converted to
Reference Rated Loans on the last day of such then expiring Interest Period.
 
                                       15
<PAGE>   19
 
                                  ARTICLE III
 
                         REPRESENTATIONS AND WARRANTIES
 
     SECTION 3.01. Representations and Warranties by the Company. The Company
represents and warrants to each of the Banks that:
 
          (a) Corporate Existence, Qualification. The Company (i) has been duly
     incorporated and is validly existing and in good standing under the laws of
     the State of Delaware and (ii) is qualified to do business as a foreign
     corporation and is in good standing in each jurisdiction of the United
     States in which the ownership of its properties or the conduct of its
     business requires such qualification and where the failure to so qualify
     would have a material adverse effect upon the business of the Company and
     its subsidiaries taken as a whole.
 
          (b) Corporate Authorization and Binding Agreement. This Agreement has
     been duly authorized, executed and delivered by the Company and constitutes
     a valid and binding agreement of the Company, enforceable in accordance
     with its terms, subject to the effect of applicable bankruptcy, insolvency
     or similar laws affecting creditors' rights generally and equitable
     principles of general applicability. The Notes have been duly authorized by
     the Company and, when executed, issued and delivered pursuant hereto for
     value received, will constitute valid and binding obligations of the
     Company, enforceable in accordance with their terms, except as (i) the
     enforceability thereof may be limited by bankruptcy, insolvency or similar
     laws affecting creditors' rights generally and (ii) rights of acceleration
     and the availability of equitable remedies may be limited by equitable
     principles of general applicability.
 
          (c) No Conflicting Agreements. The execution, delivery and performance
     of this Agreement and the execution, issuance, delivery and performance of
     the Notes will not conflict with any provision of (i) the restated
     certificate of incorporation or by-laws of the Company or (ii) any
     indenture, loan agreement or other similar agreement or instrument binding
     on the Company.
 
          (d) Governmental Approvals. No authorization, consent or approval of
     any governmental body or agency is required for the valid execution,
     delivery and performance of this Agreement by the Company or for the valid
     execution, issuance, delivery and performance of the Notes by the Company.
 
          (e) Proceedings. To the knowledge of the Company, there is no
     proceeding pending or threatened before any court or administrative agency
     which, in the opinion of the Company, will result in a final determination
     which would have the effect of preventing the Company from carrying on its
     business or from meeting its current and anticipated obligations on a
     timely basis.
 
          (f) Financial Position. The consolidated balance sheets of the Company
     and its subsidiaries as of December 31, 1992 and 1993, and the related
     consolidated statements of income, stockholders' equity and cash flows for
     each of the years in the three-year period ended December 31, 1993,
     certified by KPMG Peat Marwick, present fairly the consolidated financial
     position of the Company and its subsidiaries at December 31, 1992 and 1993
     and the results of their operations and their cash flows for each of the
     years in the three-year period ended December 31, 1993, in conformity with
     generally accepted accounting principles applied on a consistent basis.
     Since December 31, 1993, there has been no material adverse change in the
     consolidated financial position or results of operations of the Company and
     its subsidiaries which would have the effect of preventing the Company from
     carrying on its business or from meeting its current and anticipated
     obligations on a timely basis.
 
          (g) Ownership of Property. The Company and each of its subsidiaries
     has valid and defensible title to any of their properties described as
     Proved Reserves in the Engineer's Opinion delivered to the Banks prior to
     the date hereof, or as the case may be, the most recent Engineer's Opinion
     provided pursuant to Section 4.01, free and clear of any Liens except as
     permitted in Section 1005 of the Public Indenture.
 
                                       16
<PAGE>   20
 
                                   ARTICLE IV
 
                            COVENANTS OF THE COMPANY
 
     SECTION 4.01. Covenants. The Company covenants and agrees that, from the
date of this Agreement and for so long as any of the Notes shall be outstanding
or any of the Banks shall have any Commitments:
 
          (a) Financial Statements, Etc. The Company will furnish to each Bank:
     (i) 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 Securities Exchange Act of 1934; or, if
     the Company is not required to file information, documents or reports
     pursuant to either of said Sections, then such of the supplementary and
     periodic information, documents and reports which may be required pursuant
     to Section 13 of the Securities Exchange Act of 1934 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; (ii) within 60
     days after the close of each of the first three quarters of each of the
     Company's fiscal years a statement by a responsible officer of the Company
     stating whether to the knowledge of the Company an event has occurred
     during such period and is continuing which constitutes an Event of Default
     or would constitute an Event of Default with the giving of notice or the
     lapse of time, or both, and, if so, stating the facts with respect thereto;
     (iii) within 120 days after the close of each of the Company's fiscal years
     a statement by a responsible officer of the Company stating whether to the
     knowledge of the Company an event has occurred during such period and is
     continuing which constitutes an Event of Default or would constitute an
     Event of Default with the giving of notice or the lapse of time, or both,
     and, if so, stating the facts with respect thereto; (iv) within five
     Business Days after the Company becomes aware of the occurrence of any
     event which constitutes an Event of Default, or would constitute an Event
     of Default with the passage of time or the giving of notice, or both, if
     such occurrence is then continuing notice of such occurrence together with
     a statement by a responsible officer of the Company stating the facts with
     respect thereto; and (v) such other information respecting the financial
     condition or operations of the Company and its subsidiaries as any Bank may
     from time to time reasonably request.
 
          (b) Engineer's Report. The Company will furnish to each Bank subject
     to Section 8.02, on or before March 1 in each year, an Engineer's Opinion.
     The Engineer's Opinion shall, subject to the proviso below, (i) be
     certified by a responsible officer of the Company as a true, correct and
     complete report containing no material misstatements or misrepresentations
     and (ii) cover 100% of the Proved Reserves of the Company (or such lesser
     amount as may be agreed upon by the Agent and the Determining Banks),
     calculated as of the January 1 preceding such March 1, provided, however,
     that if as of January 1 (i) neither of the ratings by Moodys and S&P of the
     Company's long term senior unsecured debt is greater than "BBB-" or
     equivalent rating, but such ratings are not both less than "BBB-" or
     equivalent rating and upon the written request of the Majority Banks or
     (ii) Moodys and S&P both rate the Company's long term senior unsecured debt
     less than "BBB-" or equivalent rating, the Engineer's Opinion shall be
     issued by an Independent Engineer on the greater of (i) each field that
     represents more than 2% of the total Proved Reserves of the Company or (ii)
     at least 50% of the Proved Reserves of the Company. For purposes of this
     Section 4.01, in the event a rating is not available from either Moodys or
     S&P, such rating agency will be deemed to have assigned its lowest rating.
 
          (c) Limitations on Sales and Leasebacks. The Company will not itself,
     and will not permit any subsidiary to, enter into any arrangement with any
     bank, insurance company or other lender or investor (not including the
     Company or any subsidiary) or to which any such lender or investor is a
     party, providing for the leasing by the Company or a subsidiary for a
     period, including renewals, in excess of three years, of any Principal
     Property (as defined in the Public Indenture) which has been or is to be
     sold or transferred more than 180 days after the completion of construction
     and commencement of full operation thereof, by the Company or any
     subsidiary to such lender or investor or to any Person to whom
 
                                       17
<PAGE>   21
 
     funds have been or are to be advanced by such lender or investor on the
     security of such Principal Property (herein referred to as a "sale and     
     leaseback transaction") unless either:
                
             (i) the Company or such subsidiary could create Indebtedness
        secured pursuant to Section 1005 of the Public Indenture on the
        Principal Property to be leased back in an amount equal to the
        Attributable Debt with respect to the lease resulting from such sale and
        leaseback transaction without equally and ratably securing the Notes; or
 
             (ii) the Company within 180 days after the sale or transfer shall
        have been made by the Company or by a subsidiary, applies an amount
        equal to the greater of (A) the net proceeds of the sale of the
        Principal Property sold and leased back pursuant to such arrangement or
        (B) the net amount (after deducting applicable reserves) at which such
        Principal Property is carried on the books of the Company or such
        subsidiary at the time of entering into such arrangement, to the
        retirement of Indebtedness of the Company.
 
          (d) Compliance with Indenture. The Company will comply with the
     provisions of Sections 1004 and 1005 of the Public Indenture (a true and
     complete copy of which the Company hereby represents has been furnished to
     each Bank), which provisions, together with related definitions, are hereby
     incorporated herein by reference for the benefit of the Banks and shall
     continue in effect for purposes of this Section 4.02 regardless of
     termination, or any amendment or waiver of, or any consent to any deviation
     from or other modification of, the Public Indenture; provided, however,
     that, for purposes of this Section 4.02, (a) references in the Public
     Indenture to "the Securities" shall be deemed to refer to the obligations
     of the Company to pay the principal of and interest on the Notes, (b)
     references in the Public Indenture to "the Trustee" shall be deemed to
     refer to the Agent, (c) references in the Public Indenture to "this
     Indenture" shall be deemed to refer to this Agreement and (d) references in
     the Public Indenture to "supplemental indentures" shall be deemed to refer
     to supplements to this Agreement.
 
          (e) Limitation on Mortgages. The Company will not incur, issue, assume
     or guarantee any indebtedness secured by a mortgage on oil, gas, coal or
     other minerals in place, or on related leasehold or other property
     interest, which is incurred to finance development or production costs if
     the aggregate amount of all such indebtedness exceeds 10% of Consolidated
     Net Tangible Assets (as defined in the Public Indenture).
 
          (f) Consolidated Stockholders' Equity. The Company will maintain, at
     the end of each calendar quarter, Consolidated Stockholders' Equity of at
     least $650,000,000 exclusive of the effect of any noncash writedowns made
     subsequent to the date hereof.
 
          (g) Current Ratio. The Company will maintain, at the end of each
     calendar quarter, consolidated current assets plus the Commitments minus
     the then outstanding Loans in an amount at least equal to its consolidated
     current liabilities.
 
          (h) Notice of Dispositions of Property. The Company shall promptly
     notify the Agent of any sales, transfers, distributions or other
     dispositions during any calendar year resulting in the receipt of Net
     Proceeds in an aggregate amount in excess of $50,000,000 of property
     identified in the most recent Engineer's Opinion delivered pursuant to
     Section 4.01.
 
          (i) Insurance. The Company will at all times maintain, with
     financially sound and reputable insurers, insurance of the kinds, covering
     the risks and in the relative proportionate amounts customarily carried by
     companies engaged in the same or similar business and similarly situated.
 
                                   ARTICLE V
 
                             CONDITIONS OF LENDING
 
     SECTION 5.01. Conditions Precedent to the Initial Loans. The obligation of
each Bank to make its initial Loan is subject to the conditions precedent that
each Bank and the Agent shall have received on or before the date of the initial
Loan:
 
                                       18
<PAGE>   22
 
          (a) An appropriate Note payable to its order.
 
          (b) Certified copies of the resolutions of the Board of Directors or
     the Executive Committee of the Board of Directors of the Company
     authorizing the execution, delivery and performance of this Agreement and
     the execution, issuance, delivery and performance of the Notes.
 
          (c) An opinion of Messrs. Davis Polk & Wardwell, special counsel to
     the Company, to the effect that:
 
             (i) the Company is validly existing and in good standing under the
        laws of the State of Delaware;
 
             (ii) this Agreement and the Notes have been duly authorized,
        executed and delivered by the Company;
 
             (iii) this Agreement constitutes a valid and binding agreement of
        the Company and the Notes constitute valid and binding obligations of
        the Company, in each case enforceable in accordance with their
        respective terms, subject to the effect of applicable bankruptcy,
        insolvency or similar laws affecting creditors' rights generally and
        equitable principles of general applicability;
 
             (iv) the execution, delivery and performance by the Company of this
        Agreement and the Notes will not conflict with the restated certificate
        of incorporation or by-laws of the Company, each as in effect on the
        date of such opinion; and
 
             (v) no authorization, consent or approval of any governmental body
        or agency of the State of New York or the United States of America which
        has not been obtained is required in connection with the execution,
        delivery and performance by the Company of this Agreement and the Notes.
 
     In rendering such opinion, Messrs. Davis Polk & Wardwell may rely upon
     opinions of local counsel as to matters of local law and may state that
     they have relied as to certain matters on information obtained from public
     officials, officers of the Company and other sources believed by them to be
     responsible.
 
          (d) A favorable opinion of the General Counsel or General Attorney of
     the Company, to the effect that:
 
             (i) the Company is qualified to do business as a foreign
        corporation and is in good standing in the States of Kansas, Louisiana,
        Montana, New Mexico, Oklahoma, Texas and Wyoming;
 
             (ii) the execution, delivery and performance of this Agreement and
        the execution, issuance, delivery and performance of the Notes will not
        (x) contravene any applicable provision of any applicable law or
        applicable order or (y) conflict with any provision of any indenture,
        loan agreement or other similar agreement or instrument known to such
        counsel (having made due inquiry with respect thereto) binding on the
        Company or affecting its property, and
 
             (iii) to the knowledge of such counsel (having made due inquiry
        with respect thereto), there is no proceeding pending or threatened
        before any court or administrative agency which, in the opinion of such
        counsel, will result in a final determination which would have the
        effect of preventing the Company from carrying on its business or from
        meeting its current and anticipated obligations on a timely basis.
 
     In rendering such opinion, the General Counsel or General Attorney of the
     Company shall opine only as to matters governed by the Federal laws of the
     United States of America, the laws of the State of Texas and the General
     Corporation Law of the State of Delaware. Such counsel may also state that
     he has relied on certificates of state officials as to qualification to do
     business and good standing, certificates of officers of the Company and
     other sources believed by him to be responsible.
 
          (e) A copy of a written irrevocable notice from the Company
     terminating the Commitments, as defined in the Credit Agreement and
     directing the Agent, as defined in the Credit Agreement, to prepay
 
                                       19
<PAGE>   23
 
     by wire transfer, in immediately available funds, in full any loans
     then outstanding thereunder, together with accrued interest thereon and
     any unpaid commitment fees then accrued.
 
          (f) A certificate of a responsible officer of the Company to the
     effect that:
 
             (i) the representations and warranties contained in Section 3.01
        are true and accurate on and as of the date of the making of each such
        Loan as though made on and as of such date (except to the extent that
        such representations and warranties relate solely to an earlier date);
 
             (ii) no event has occurred and is continuing or would result from
        the proposed borrowing, which constitutes an Event of Default or would
        constitute an Event of Default with the giving of notice or lapse of
        time, or both;
 
             (iii) the Company is in compliance with all the terms, covenants
        and conditions of this Agreement which are binding upon it; and
 
             (iv) after giving effect to the proposed borrowing of which such
        Loan is a part and the application of the proceeds thereof, the
        Available Borrowing Base would not be less than zero.
 
     SECTION 5.02. Conditions Precedent to Loans. The obligation of each Bank to
make any Loan is subject to the further conditions precedent that on the
relevant Borrowing Date clauses (i) through (iv) in subsection (f) of Section
5.01 shall be true and such borrowing shall be deemed to constitute a
certification by the Company that such statements are true.
 
                                   ARTICLE VI
 
                               EVENTS OF DEFAULT
 
     SECTION 6.01. Events of Default. If one or more of the following events of
default ("Events of Default") shall occur and be continuing:
 
          (a) the Company shall default in any payment of principal of any Loan
     when due and such default shall continue for a period of 3 days; or the
     Company shall default in any payment of interest on any Loan, or in the
     payment of any commitment fees pursuant to Section 2.04, when due and
     payable, and such default shall continue for a period of 10 days;
 
          (b) any representation or warranty, or certification made by the
     Company herein or any statement or representation or certification made or
     deemed to be made pursuant to Article V of this Agreement shall prove to
     have been incorrect in any material respect when made;
 
          (c) the Company shall default in the performance of any other term,
     condition, covenant or agreement contained in this Agreement and such
     default shall continue unremedied for a period of 30 days after written
     notice thereof, specifying such default and requiring it to be remedied,
     shall have been received by the Company from any Bank,
 
          (d) the Company shall default in the performance of any term,
     condition, covenant or agreement contained in the Public Indenture and such
     default shall have resulted in any of the Securities (as defined in the
     Public Indenture) being declared due and payable prior to the date on which
     such Securities would otherwise have become due and payable;
 
          (e) the Company or any subsidiary shall (i) default in the payment of
     principal of any Indebtedness in an aggregate principal amount in excess of
     $25,000,000 (other than the Notes) beyond the period of grace, if any,
     provided in the instrument or agreement under which such Indebtedness was
     created as and when the same shall become due and payable whether at
     maturity, upon redemption, by declaration or otherwise, or (ii) default in
     the observance or performance of any other agreement or condition relating
     to any such Indebtedness or contained in any instrument or agreement
     evidencing, securing or relating thereto, or any other event shall occur or
     condition exist unremedied or unwaived, the effect of which default or
     other event or condition is to cause, or to permit the holder or holders of
     such Indebtedness (or
 
                                       20
<PAGE>   24
 
     a trustee or agent on behalf of such holder or holders) to cause, with the
     giving of notice if required, but without the passage of any       
     additional time, such Indebtedness to become due prior to its stated
     maturity,
 
          (f) the Company shall (i) apply for or consent to the appointment of,
     or the taking of possession by, a receiver, custodian, trustee or
     liquidator of itself or of its property, (ii) admit in writing its
     inability to pay its debts as such debts become due, (iii) make a general
     assignment for the benefit of its creditors, (iv) commence a voluntary case
     under the federal Bankruptcy Code (as now or hereafter in effect), (v) file
     a petition seeking to take advantage of any other law providing for similar
     relief of debtors, or (vi) consent or acquiesce in writing to any petition
     duly filed against it in any involuntary case under such Bankruptcy Code;
 
          (g) a proceeding or case shall be commenced, without the application
     or consent of the Company, in any court of competent jurisdiction seeking
     (i) its liquidation, reorganization, dissolution or winding up, or the
     composition or readjustment of its debts, (ii) the appointment of a
     trustee, receiver, custodian, liquidator or the like of it or of its
     assets, or (iii) similar relief in respect of it, under any law providing
     for the relief of debtors, and such proceeding or case shall continue
     undismissed, or unstayed and in effect, for a period of 60 days (or such
     longer period, so long as the Company shall be taking such action in good
     faith as shall be reasonably necessary to obtain the timely dismissal or
     stay of such proceeding or case); or an order for relief shall be entered
     in an involuntary case under the federal Bankruptcy Code (as now or
     hereafter in effect), against the Company, or
 
          (h) any Change in Control shall occur,
 
then and in each and every case the Majority Banks, by notice in writing to the
Company, may terminate the Commitments of the Banks hereunder and/or declare the
unpaid balance of the Notes and any other amounts payable hereunder to be
forthwith due and payable and thereupon such balance shall become so due and
payable without presentation, protest or further demand or notice of any kind,
all of which are hereby expressly waived; provided that in the case of clause
(f) or (g) above the Commitments of the Banks hereunder shall automatically
terminate and the Notes and any other amounts payable hereunder shall forthwith
be due and payable.
 
                                  ARTICLE VII
 
                      THE AGENT AND THE DETERMINING BANKS
 
     SECTION 7.01. Powers. Each Bank hereby irrevocably appoints and authorizes
the Agent to act as its agent hereunder. The Agent and the Determining Banks
shall have and may exercise such powers hereunder and under any agreement
executed and delivered pursuant to the terms hereof as are specifically
delegated to the Agent or the Determining Banks, as the case may be, by the
terms hereof or thereof, together with such powers as are reasonably incidental
thereto. The Agent and the Determining Banks will have no duties or
responsibilities except those expressly set forth in this Agreement, and shall
not by reason of this Agreement have a fiduciary relationship with any Bank.
 
     SECTION 7.02. Agent's Reliance, Etc. In performing its duties as Agent or a
Determining Bank hereunder and under any agreement executed and delivered
pursuant to the terms hereof, the Agent and each Determining Bank will take the
same care as it takes in connection with loans in which it alone is interested.
However, neither the Agent nor the Determining Banks nor any of their directors,
officers, agents or employees shall be liable for any action taken or omitted to
be taken by them hereunder or thereunder or in connection herewith or therewith
except for their own gross negligence or willful misconduct.
 
     SECTION 7.03. No Responsibility for Recitals, Etc. The Agent and the
Determining Banks will not be responsible to the Banks for any recitals,
statements, warranties or representations herein or under any agreement executed
and delivered pursuant to the terms hereof, for the value, effectiveness,
genuineness, enforceability or sufficiency of this Agreement, the Notes or any
agreement executed and delivered pursuant hereto or be bound to ascertain or
inquire as to the performance or observance of any of the terms of this
 
                                       21
<PAGE>   25
 
Agreement on the part of the Company or of any of the terms of any such other
agreement by any party thereto.
 
     SECTION 7.04. Right to Indemnity. The Agent shall be fully justified in
failing or refusing to take any action hereunder or under any agreement executed
and delivered pursuant to the terms hereof unless it shall first be indemnified
(upon requesting such indemnification) to its satisfaction by the Banks against
any and all liability and expense which it may incur by reason of taking or
continuing to take any such action. The Banks agree to indemnify the Agent and
the Determining Banks, to the extent not reimbursed by the Company under this
Agreement, ratably in accordance with the aggregate principal amount of the
Loans made by them (or, if no Loans are outstanding, ratably in accordance with
their respective Commitments), for any and all liabilities, obligations,
damages, penalties, actions, judgments, suits, costs, expenses or disbursements
of any kind and nature whatsoever which may be imposed on, incurred by or
asserted against the Agent as agent or the Determining Banks, as the case may
be, in any way relating to or arising out of this Agreement, the Notes or any
other documents contemplated by or referred to herein or the transactions
contemplated hereby (including, without limitation, the costs and expenses which
the Company is obligated to pay under this Agreement but excluding, unless an
Event of Default has occurred and is continuing, normal administrative costs and
expenses incident to the performance of its agency duties hereunder) or the
enforcement of any of the terms hereof or thereof or of any such other
documents; provided no such liability, obligation, damage, penalty, action,
judgment, suit, cost, expense or disbursement results from the Agent's or the
Determining Banks', as the case may be, gross negligence or willful misconduct;
provided, however, that, in the event the Agent receives indemnification from
the Banks hereunder with respect to costs and expenses which the Company is
obligated to pay under this Agreement, the Agent shall remit to the Banks the
amount of such costs and expenses to the extent subsequently paid by the
Company, such remittance to be in accordance with the proportionate amount of
the indemnification made by each respective Bank.
 
     SECTION 7.05. Action on Instructions of Banks. The Agent shall in all cases
be fully protected in acting or refraining from acting hereunder or under any
agreement executed and delivered pursuant to the terms hereof in accordance with
written instructions to it signed by the Majority Banks, and (subject to Section
8.01) such instructions and any action taken or failure to act pursuant thereto
shall be binding on all of the Banks.
 
     SECTION 7.06. Employment of Agents. The Agent and the Determining Banks may
employ agents and attorneys-in-fact and shall not be answerable, except as to
money or securities received by them or their authorized agents, for the default
or misconduct of any such agent or attorney-in-fact selected by it with
reasonable care.
 
     SECTION 7.07. Reliance on Documents. The Agent and each Determining Bank
shall be entitled to rely upon (a) any paper or document believed by it to be
genuine and to have been signed or sent by the proper person or persons and (b)
the opinion of its counsel with respect to legal matters. The Agent and the
Determining Banks may deem and treat the payee of any Note as the owner thereof
for all purposes hereof unless and until a notice of the assignment or transfer
thereof satisfactory to the Agent signed by such payee shall have been filed
with the Agent.
 
     SECTION 7.08. Rights as a Bank. With respect to its Commitment and the
Loans made by it, the Agent and each Determining Bank shall have the same rights
and powers hereunder and under any agreement executed and delivered pursuant to
the terms hereof as any Bank and may exercise the same as though it were not the
Agent or Determining Bank, as the case may be, and the term "Bank" or "Banks"
shall, unless the context otherwise indicates, include the Agent and each
Determining Bank in its capacity as a Bank hereunder and thereunder. The Agent
and the Determining Banks and their respective affiliates may accept deposits
from, lend money to, and generally engage in any kind of banking or trust
business with the Company, its subsidiaries and its affiliates as if it were not
the Agent or a Determining Bank, as the case may be.
 
     SECTION 7.09. Non-Reliance on Agent or other Banks. Each Bank agrees that
it has, independently and without reliance on the Agent or on any other Bank,
and based on such documents and information as it has deemed appropriate, made
its own credit analysis of the Company and decision to enter into this Agreement
and that it will, independently and without reliance upon the Agent or any other
Bank, and based
 
                                       22
<PAGE>   26
 
on such documents and information as it shall deem appropriate at the time,
continue to make its own analysis and decisions in taking or not taking action
under this Agreement or the Notes. The Agent and the Determining Banks will not
be required to keep themselves informed as to the performance or observance by
the Company of this Agreement or any other document referred to or provided for
herein or therein or to inspect the properties or books of the Company. Except
for notices, reports and other documents expressly required to be furnished to
the Banks by the Agent hereunder, the Agent shall not have any duty or
responsibility to provide any Bank with any credit or other information
concerning the affairs, financial condition or business of the Company or which
may at any time come into possession of the Agent or any of its affiliates.
 
     SECTION 7.10. Events of Default. In the event the Agent receives actual
knowledge of an Event of Default hereunder, the Agent shall promptly inform the
Banks thereof. The Agent shall not be deemed to have actual knowledge of an
Event of Default hereunder until it shall have received a written notice from
the Company or any Bank referring to this Agreement, describing such Event of
Default and stating that such notice is a "Notice of Default".
 
     SECTION 7.11. Successor Agent. If the Agent shall resign as Agent under
this Agreement, or shall cease to be a Bank under this Agreement, then the Banks
shall appoint any Bank which is a party to this Agreement (with the consent of
such Bank) as successor Agent for the Banks under this Agreement, whereupon such
successor Agent shall succeed to the rights, powers and duties of the Agent, and
the former Agent's rights, powers and duties as Agent shall be terminated and
cancelled, without any other or further act or deed on the part of such former
Agent or any of the parties to this Agreement.
 
                                  ARTICLE VIII
 
                                 MISCELLANEOUS
 
     SECTION 8.01. Modifications, Consents and Waivers. To the extent permitted
by law, no failure or delay on the part of the Banks in exercising any power or
right hereunder shall operate as a waiver thereof, nor shall any single or
partial exercise of any such right or power preclude any other or further
exercise thereof or the exercise of any other right or power hereunder. No
modification or waiver of any provision of this Agreement or of the Notes nor
consent to any departure by the Company therefrom shall in any event be
effective unless the same shall be in writing and signed by the Majority Banks,
and then such waiver or consent shall be effective only in the specific instance
and for the purpose for which given; provided, however, that no such
modification, waiver or consent may be made which will (a) extend the time for
payment of principal of or interest on any Note or reduce the principal amount
of or rate of interest on any Note or otherwise affect the terms of payment of
the principal of or interest on any Note without the written consent of the
holder of such Note or (b) affect the terms of or reduce the amount of the
commitment fee or reduce the percentages of 66 2/3% and 75% specified in the
definition of "Majority Banks" or amend the provisions of this Section 8.01
without the written consent of the holders of all Notes at the time outstanding
(or, if no Notes are then outstanding, all of the Banks). No notice to or demand
on the Company in any case shall, of itself, entitle the Company to any other or
further notice or demand in similar or other circumstances.
 
     SECTION 8.02. Confidentiality. Each Bank shall maintain in confidence and
not publish, disseminate or disclose in any manner or to any Person and shall
not use any nonpublic information relating to the Company and its subsidiaries
which may be furnished pursuant to this Agreement (hereinafter collectively
called "Confidential Information"), subject to each Bank's (a) obligation to
disclose any such Confidential Information pursuant to a request or order under
applicable laws and regulations or pursuant to a subpoena or other legal
process, (b) right to disclose any such Confidential Information to bank
examiners, its affiliates, auditors, counsel and other professional advisors,
(c) right to use any such Confidential Information in connection with evaluating
the transactions set forth herein, and (d) right to disclose any such
Confidential Information in connection with any litigation involving the Banks
and the Company, provided, however, that Confidential Information disclosed
pursuant to clause (b) or (d) of this sentence shall be so disclosed subject to
such procedures as are reasonably calculated to maintain the confidentiality
thereof, and provided, further, that Confidential Information disclosed pursuant
to applicable laws, regulations, subpoenas or other legal
 
                                       23
<PAGE>   27
 
process shall be so disclosed subject to such confidentiality provisions, if
any, as may be provided under applicable law. The Banks agree, to the extent
permitted by applicable law, to use their best efforts promptly to notify the
Company in writing of each order, subpoena or other legal process providing for
the disclosure and/or production of Confidential Information and shall, to the
extent permitted by applicable law, use their best efforts promptly to supply
the Company with a copy of such order, subpoena or other legal process, in order
that the Company may intervene in the relevant administrative or legal
proceeding or take other appropriate legal action to protect the confidentiality
of such Confidential Information.
 
     SECTION 8.03. Addresses for Notices. Except as otherwise provided herein,
all communications and notices provided for hereunder shall be in writing and,
if to the Company, mailed to P.O Box 1330, Houston, Texas 77251-1330 Attention:
Treasurer, and, if to the Agent, delivered or mailed to 270 Park Avenue, New
York, New York 10017 (Attention: Energy Division), and, if to any Bank,
delivered or mailed to its address as set forth on the signature pages hereof,
or, as to any party, at such other address as such party may designate in
writing to each party concerned. Except as otherwise provided herein, all
communications and notices provided for hereunder shall be effective when
deposited in the mails, postage prepaid, or delivered to the telegraph company,
addressed as aforesaid.
 
     SECTION 8.04. Costs, Expenses and Taxes. The Company agrees to pay all
costs and expenses in connection with the preparation, execution and delivery of
this Agreement and the Notes (including the reasonable fees of Messrs. Simpson
Thacher & Bartlett, special counsel to the Agent) and costs and expenses, if
any, in connection with the enforcement of this Agreement and the Notes, as well
as any and all stamp and other taxes payable or determined to be payable in
connection with the execution or delivery of this Agreement or the Notes, and to
save the holders of the Notes harmless from any and all liabilities with respect
to or resulting from any delay or omission to pay such taxes, if any, which may
be payable or determined to be payable in connection with the execution and
delivery of this Agreement or the Notes.
 
     SECTION 8.05. Binding Effect and Assignment. This Agreement shall be
binding upon and inure to the benefit of the Company and the Banks and their
respective successors and assigns, except that the Company may not assign or
transfer its rights hereunder without prior written consent of the Banks. A Bank
may not assign or transfer its rights hereunder, subject to any legal or
regulatory requirements, without prior written consent of the Company, provided,
however, that each Bank may at any time grant participations in its Loans and
its Commitment ("Participations") to other Persons (such Persons being herein
called "Participants"). The Company agrees that each Participant shall be deemed
to be a "Bank" for purposes of Sections 2.12(a), 2.14 and 2.20 with respect to
its Participations outstanding from time to time. Each Bank agrees with the
Company that (a) each such Participation shall be created in the ordinary course
of the commercial banking business of such Bank and (b) such Participation shall
be created by such Bank in compliance with all applicable laws. Each Bank agrees
that the creation of Participations shall require no action on the part of the
Company. The creation of a Participation shall not give any Participant any
rights under this Agreement or any Note nor shall it relieve any Bank of its
obligations under this Agreement. Each assignment will be subject to the payment
of a service fee of $3,000 to the Agent by the parties to such assignment.
 
     SECTION 8.06. Termination and Substitution of Bank. (a) If (i) the
obligation of any Bank to make, convert Loans into or continue Eurodollar Loans
has been suspended pursuant to Section 2.13, (ii) any Bank has demanded
compensation under Section 2.12 or (iii) any Bank shall decline to extend its
Commitment pursuant to Section 2.05(c), the Company may, upon three Business
Days' notice to such Bank through the Agent, prepay in full all of the
outstanding Loans of such Bank, or its assignee, together with accrued interest
thereon to the date of prepayment and all other amounts payable hereunder to
such Bank accrued to the date of prepayment, and concurrently therewith
terminate this Agreement with respect to such Bank by giving notice of such
termination to the Agent and such Bank.
 
     (b) If any Bank shall become a Defaulting Bank, the Company may, in its
sole discretion and without prejudice to any right or remedy that the Company
may have against such Defaulting Bank with respect to, on account of, arising
from or relating to any event pursuant to which such Bank shall be a Defaulting
Bank, upon notice to such Defaulting Bank and the Agent, (i) if at such time
there are no Loans of such Defaulting Bank outstanding, terminate this Agreement
with respect to such Defaulting Bank, or (ii) if at such time such
 
                                       24
<PAGE>   28
 
Defaulting Bank shall have Loans outstanding, subject to obtaining a substitute
bank or banks to assume the Commitment of such Defaulting Bank pursuant to
subsection (c) below, terminate this Agreement with respect to such Defaulting
Bank and prepay in full the outstanding Loans of such Defaulting Bank together
with accrued interest to the date of prepayment, provided that the provisions of
Section 2.20 shall not apply to any such prepayment.
 
     (c) If the Company terminates this Agreement with respect to any Bank under
this Section 8.06, the Company shall use its best efforts, with the assistance
of the Agent, to seek a mutually satisfactory substitute bank or banks (which
may be one or more of the Banks) to assume the Commitment of such relevant Bank.
 
     SECTION 8.07. Governing Law. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of New York.
 
     SECTION 8.08. Headings. Article and Section headings used in this Agreement
are for convenience only and shall not affect the construction of this
Agreement.
 
     SECTION 8.09. Execution in Counterparts. This Agreement may be executed by
the parties hereto individually or in any combinations of the parties hereto in
several separate counterparts, each of which shall be an original, and all of
which taken together shall constitute one and the same agreement.
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized as of the day
and year first above written.
 
                                          ANADARKO PETROLEUM CORPORATION
 
                                          By:  A. L. Richey
                                          Title: Treasurer
 
                                          CHEMICAL BANK
 
                                          By:  Peter N. Anderson
                                          Title: Managing Director
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                               Chemical Bank
                                               270 Park Avenue, 8th Floor
                                               New York, New York 10017
                                               Attention: John Gehebe
                                                          Phone: (212) 270-3531
                                                          Fax: (212) 270-4892
 
                                          Eurodollar Lending Office:
 
                                               Chemical Bank
                                               270 Park Avenue, 8th Floor
                                               New York, New York 10017
                                               Attention: John Gehebe
                                                          Phone: (212) 270-3531
                                                          Fax: (212) 270-4892
 
                                       25
<PAGE>   29
 
                                          THE CHASE MANHATTAN BANK,
                                          NATIONAL ASSOCIATION
 
                                          By:  Bettylou J. Robert
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          The Chase Manhattan Bank, National
                                          Association
                                               1 Chase Manhattan Plaza
                                               3rd Floor
                                               New York, New York 10081
                                               Attention: Global Energy
                                                          Mr. Vito Cipriano
                                                          Fax: (212) 552-1687
                                               with copies to:
                                               Chase Manhattan Southwest
                                               1100 Milam
                                               Suite 2345
                                               Houston, Texas 77002
                                               Attention: Mr. Richard S. Walker
                                                          Fax: (713) 751-9122
 
                                          Eurodollar Lending Office:
 
                                          The Chase Manhattan Bank, National
                                          Association
                                               1 Chase Manhattan Plaza
                                               3rd Floor
                                               New York, New York 10081
                                               Attention: Global Energy
                                                          Mr. Vito Cipriano
                                                          Fax: (212) 552-1687
 
                                          MORGAN GUARANTY TRUST COMPANY OF
                                            NEW YORK
 
                                          By:  Vernon M. Ford, Jr.
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                         Morgan Guaranty Trust Company of New
                                         York
                                               60 Wall Street
                                               22nd Floor
                                               New York, New York 10260
                                               Attention: Jeannie Mattson
 
                                       26
<PAGE>   30
 
                                          Eurodollar Lending Office:
 
                                          J. P. Morgan Delaware
                                               902 Market Street
                                               Wilmington, Delaware 19801
                                               Attention: Loan Department
                                                          Telex
                                                          Number/Answerback:
                                                          177425/NBDELUT
 
                                          THE BANK OF NEW YORK
 
                                          By:  Renee Biglani
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          The Bank of New York
                                               Attention: Brad Davis and/or
                                                          Commercial Loan
                                                          Department
                                          1 Wall Street
                                          19th Floor
                                          New York, New York 10286
 
                                          Eurodollar Lending Office:
 
                                          The Bank of New York
                                               Attention: Eurodollar/Cayman
                                                          Islands Funding Area
                                               101 Barclay St.
                                               New York, New York 10286
                                          Ref: Anadarko Petroleum Corporation
 
                                          CONTINENTAL BANK N.A.
 
                                          By:  R. R. Ingersoll
                                          Title: Vice President
 
                                          Address for Notices:
 
                                          Continental Bank N.A.
                                               231 South LaSalle Street
                                               Chicago, Illinois 60697
                                               Attention: R. R. Ingersoll
 
                                          Domestic Lending Office:
 
                                          Continental Bank N.A.
                                               231 South LaSalle Street
                                               Chicago, Illinois 60697
                                               Attention: Kathy Hill-Rayford
 
                                       27
<PAGE>   31
 
                                          Eurodollar Lending Office:
 
                                          Continental Bank N.A.
                                               231 South LaSalle Street
                                               Chicago, Illinois 60697
                                               Attention: Kathy Hill-Rayford
 
                                          CREDIT SUISSE
 
                                          By:  William P. Murray
                                          Title: Member of Senior Management
 
                                          By:  Eristinn R. Kristinsson
                                          Title: Associate
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Credit Suisse
                                               Tower 49
                                               12 East 49th Street
                                               New York, New York 10017
                                               Attention: Credit Department,
                                                          Kris Kristinsson
 
                                          Eurodollar Lending Office:
 
                                          Credit Suisse
                                               Tower 49
                                               12 East 49th Street
                                               New York, New York 10017
                                               Attention: Credit Department,
                                                          Kris Kristinsson
 
                                       28
<PAGE>   32
 
                                          MELLON BANK, N.A.
 
                                          By:  Mary Elles Usher
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Mellon Bank, N.A.
                                               3 Mellon Bank Center
                                               Room 2301
                                               Pittsburgh, Pennsylvania 15259
                                               Attention: Loan Administration
                                               with copies to:
                                                  Mellon Bank, N.A.
                                                  1100 Louisiana Street
                                                  Suite 3600
                                                  Houston, Texas 77002
                                                  Attention: Janet Jenkins
 
                                               One Mellon Bank Center
                                               44th Floor
                                               Pittsburgh, Pennsylvania 15258
                                               Attention: Energy & Utilities
                                                          Group
 
                                          Eurodollar Lending Office:
 
                                          Mellon Bank, N.A.
                                               3 Mellon Bank Center
                                               Room 2301
                                               Pittsburgh, Pennsylvania 15259
                                               Attention: Loan Administration
 
                                          BANK OF AMERICA NATIONAL TRUST
                                            AND SAVINGS ASSOCIATION
 
                                          By:  David Sisler
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          Bank of America National Trust and
                                          Savings Association
                                               1850 Gateway Blvd.
                                               Concord, California 94520
 
                                          Eurodollar Lending Office:
 
                                          Bank of America National Trust and
                                          Savings Association
                                               1850 Gateway Blvd.
                                               Concord, California 94520
 
                                       29
<PAGE>   33
 
                                          CREDIT LYONNAIS CAYMAN ISLAND BRANCH
 
                                          By:  Xavier Ratouis
                                          Title: Authorized Signature
 
                                          Address for Notices:
 
                                          c/o Credit Lyonnais Houston
                                          Representative Office
                                               1000 Louisiana Street #5360
                                               Houston, TX 77002
                                               Attention: W. Keith Buchanan
                                                          Fax: (713) 751-0307
 
                                          Domestic Lending Office:
 
                                          Credit Lyonnais Cayman Island Branch
                                               1301 Avenue of the Americas
                                               New York, New York 10019
                                               Attention: Loan Servicing
 
                                          Eurodollar Lending Office:
 
                                          Credit Lyonnais Cayman Island Branch
                                               1301 Avenue of the Americas
                                               New York, New York 10019
                                               Attention: Loan Servicing
 
                                          THE FIRST NATIONAL BANK OF CHICAGO
 
                                          By:  Martha Redeck Smith
                                          Title: Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          The First National Bank of Chicago
                                               One First National Plaza
                                               Suite 0634, 10th Floor
                                               Chicago, Illinois 60670
                                               Attention: Edward Milka
                                                          Phone (312) 732-8573
                                                          Fax: (312) 732-4840
                                                          Telex: 190201; Ansback
                                               FNBCUT
 
                                          Eurodollar Lending Office:
 
                                          The First National Bank of Chicago
                                               One First National Plaza
                                               Suite 0634, 10th Floor
                                               Chicago, Illinois 60670
                                               Attention: Edward Milka
                                                          Phone (312) 732-8573
                                                          Fax: (312) 732-4840
                                                          Telex: 190201; Ansback
                                                          FNBCUT
 
                                       30
<PAGE>   34
 
                                          NATIONSBANK OF TEXAS, N.A.
 
                                          By:  Paul A. Squirs
                                          Title: Senior Vice President
 
                                          Domestic Lending Office and Address
                                          for Notices:
 
                                          NationsBank of Texas, N.A.
                                               P.O. Box 830104
                                               Dallas, Texas 75283-0104
                                               Attention: Vicky McConnell
 
                                          Eurodollar Lending Office:
 
                                          NationsBank of Texas, N.A.
                                               P.O. Box 830104
                                               Dallas, Texas 75283-0104
                                               Attention: Vicky McConnell
 
                                          CHEMICAL BANK, as Agent
 
                                          By:  Peter N. Anderson
                                          Title: Managing Director
 
                                          Address: 270 Park Avenue
                                                   New York, New York 10017
                                                   Attention: Energy Division
 
                                       31
<PAGE>   35
 
                                                                       EXHIBIT A
 
                                 (FORM OF NOTE)
$______  *______                                              New York, New York
 
                                                        __________________, 1994
                                                                          
     For value received, ANADARKO PETROLEUM CORPORATION, a Delaware corporation
(the "Company"), promises to pay on the Maturity Date, to the order of
___________________ (the "Bank") at the office of Chemical Bank specified in
Section 2.11 of the 364-Day Credit Agreement, dated as of May 24, 1994, among
the Company, the Bank, the several other banks party thereto and Chemical Bank,
as agent (as amended, supplemented or modified from time to time hereafter, the
"Agreement"; terms defined in the Agreement shall have their defined meanings
when used in this Note), in lawful money of the United States of America, the
principal amount of_______ * ______ DOLLARS ($ ________ * ______) or, if less 
than such principal amount, the aggregate unpaid principal amount of all Loans 
made by the Bank to the undersigned pursuant to Section 2.01 of the Agreement. 
The undersigned further agrees to pay interest at said office, in like money, 
on the unpaid principal amount owing hereunder from time to time from the date 
hereof at the rates specified in Section 2.09 of the Agreement. Such interest 
shall be payable on the dates specified in Section 2.09 of the Agreement. The 
date, Type and amount of each Loan made by the Bank pursuant to Section 2.01 of 
the Agreement, each continuation thereof, each conversion of all or a portion
thereof to another Type and the date and amount of each payment of principal
with respect thereto shall be endorsed by the holder of this Note on Schedule A
annexed hereto, which holder may add additional pages to such Schedule. No
failure to make or error in making any such endorsement as authorized hereby
shall affect the validity of the obligations of the Company hereunder or the
validity of any payment hereof made by the Company.
 
     This Note is one of the Notes referred to in the Agreement and is entitled
to the benefits thereof and is subject to prepayment in whole or in part as
provided therein.
 
     Upon the occurrence of any one or more of the Events of Default specified
in the Agreement, all amounts then remaining unpaid on this Note may be declared
to be immediately due and payable as provided in the Agreement.
 
                                          ANADARKO PETROLEUM CORPORATION


                                          By ________________________________
                                          Title:
 
__________________
 
* Insert amount of Bank's Commitment
 
                                       A-1
<PAGE>   36
 
                                                                      SCHEDULE A
 
                              LOANS AND REPAYMENTS
 
<TABLE>
=====================================================================================================================
                            AMOUNT              TYPE                               AMOUNT OF
                              OF                 OF             INTEREST           PRINCIPAL                NOTATION
         DATE                LOAN               LOAN              RATE               REPAID                 MADE BY
- ---------------------------------------------------------------------------------------------------------------------
<S>                   <C>                <C>                <C>             <C>                     <C>
</TABLE>
 
                                       A-2
<PAGE>   37
 
                                                                     PAGE ... OF
                                                                      SCHEDULE A
 
 
<TABLE>
=====================================================================================================================
                            AMOUNT              TYPE                               PRINCIPAL
                              OF                 OF             INTEREST           AMOUNT OF                NOTATION
         DATE                LOAN               LOAN              RATE               REPAID                 MADE BY
- ---------------------------------------------------------------------------------------------------------------------
<S>                   <C>                <C>                <C>             <C>                     <C>

</TABLE>
 
                                       A-3
<PAGE>   38
 
                                                                       EXHIBIT B
 
                              EXTENSION AGREEMENT
 
Anadarko Petroleum Corporation
17001 Northchase Drive
Houston, Texas 77251-1330
Attention: Treasurer
 
Chemical Bank, as Agent
  under the Credit Agreement
  referred to below
270 Park Avenue
New York, NY 10017
Attention: Energy Division
 
Gentlemen:
 
     The undersigned hereby agree to extend, effective on the date upon which
Banks having 100% of the Commitments then outstanding (after giving effect to
any assignments or terminations made as contemplated in Section 2.05(c) of the
364-Day Credit Agreement dated as of May 24, 1994 among Anadarko Petroleum
Corporation, the Banks listed therein and Chemical Bank, as Agent, as amended,
supplemented or modified from time to time (the "Credit Agreement")) shall have
executed this Extension Agreement (the "Extension Date"), the Termination Date
under the Credit Agreement to the date that is 364 days from the Extension Date.
Terms defined in the Credit Agreement are used herein as therein defined.
 
     This Extension Agreement shall be construed in accordance with and governed
by the laws of the State of New York.
 
                                          CHEMICAL BANK

                                          By ___________________________
                                          Title:
 
                                          (NAME OF BANK)*
 
                                          By ___________________________
                                          Title:
 
Agreed and accepted:
 
ANADARKO PETROLEUM CORPORATION
 
By ___________________________
Title:
 
CHEMICAL BANK, as Agent
 
By ___________________________
Title:

 
_________________

* Repeat for each Bank.
 
                                       B-1

<PAGE>   1

                               [ANADARKO LETTERHEAD]



                                  July 8, 1994


                                                                     EXHIBIT 5

Anadarko Petroleum Corporation
17001 Northchase Drive
P. O. Box 1330
Houston, Texas  77251-1330

Gentlemen:

         I have assisted in the preparation of the Registration Statement of
Anadarko Petroleum Corporation, a Delaware corporation (the "Company") on Form
S-8 under the Securities Act of 1933, as amended, covering 4,000,000 shares of
the Company's common stock, par value $0.10 per share ("Common Stock"), which
may be issued pursuant to awards granted under the Company's 1993 Stock
Incentive Plan (the "Plan").

         In preparing this opinion, I have examined and relied upon
certificates of public officials and originals or copies, authenticated to my
satisfaction, of the corporate records of the Company.  I have made such other
investigation as in my opinion is proper as a basis for the opinions
hereinafter stated.

         Based upon the foregoing, I am of the opinion that:

1.       The Company is a corporation duly incorporated and validly existing
         under the laws of the State of Delaware.

2.       The shares of Common Stock issuable pursuant to awards granted under
         the Plan have been duly authorized and, when issued and sold in
         accordance with the terms of the Plan for a consideration of at least
         $0.10 per share, will be validly issued, fully paid, and
         nonassessable.

         I hereby consent to the filing of this opinion with the Securities and
Exchange Commission as an exhibit to the Registration Statement referred to
above and to the use of my name

<PAGE>   2
Anadarko Petroleum Corporation
July 8, 1994
Page 2





therein, but I do not thereby admit that I am within the class of persons whose
consent is required under the terms of the Securities Act of 1933, as amended,
or the rules and regulations of the Securities and Exchange Commission issued
thereunder.

                                                    Very truly yours,


                                                    Suzanne Suter
                                                    ------------------------
                                                    Suzanne Suter



<PAGE>   1

                                                                      EXHIBIT 23


                         INDEPENDENT AUDITORS' CONSENT





The Board of Directors
Anadarko Petroleum Corporation:


We consent to incorporation by reference in the Registration Statement on Form
S-8 of Anadarko Petroleum Corporation of our report dated January 27, 1994,
relating to the consolidated balance sheets of Anadarko Petroleum Corporation
and subsidiaries as of December 31, 1993 and 1992, and the related consolidated
statements of income, stockholders' equity, and cash flows and related
schedules for each of the years in the three-year period ended December 31,
1993, which report appears in the December 31, 1993 Annual Report on Form 10-K
of Anadarko Petroleum Corporation, and to the reference to our firm under the
heading "Incorporation of Certain Documents by Reference" in the registration
statement.



KPMG PEAT MARWICK

Houston, Texas
July 8, 1994

<PAGE>   1

                                                                     EXHIBIT 24

                               POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS that the undersigned Officer and/or
Director of ANADARKO PETROLEUM CORPORATION (the "Company"), a Delaware
corporation, does hereby constitute and appoint ROBERT J. ALLISON, JR., SUZANNE
SUTER and MICHAEL E. ROSE and each of them his true and lawful attorney and
agent to do any and all acts and things and execute any and all instruments
which, with the advice of Counsel, said attorney and agent may deem necessary
or advisable to enable the company to comply with the Securities Act of 1933,
and any rules, regulations and requirements of the Securities and Exchange
Commission, in connection with the filing under said Act of the Form S-8
Registration Statement registering equity securities, including specifically,
but without limitation thereof, to sign his name as an Officer and/or Director
of the Company, to the Form S-8 Registration Statement filed with the
Securities and Exchange Commission, and to any instrument or document filed as
a part of, or in connection with, said S-8 Registration Statement or amendment
thereto; and the undersigned does hereby ratify and confirm all that said
attorney and agent shall do or cause to be done by virtue thereof.

         IN WITNESS WHEREOF, the undersigned have subscribed these presents
this 8th day of July, 1994.


<TABLE>
<S>                                        <C>               

       Robert J. Allison, Jr.                       Ronald Brown 
- ----------------------------------         ----------------------------------
       Robert J. Allison, Jr.                       Ronald Brown 

         Conrad P. Albert                           James L. Bryan 
- ----------------------------------         ----------------------------------                                                       
         Conrad P. Albert                           James L. Bryan

           Larry Barcus                             John R. Gordon          
- ----------------------------------         ---------------------------------
           Larry Barcus                             John R. Gordon


         Michael E. Rose                           Charles M. Simmon
- -----------------------------------        -----------------------------------       
         Michael E. Rose                           Charles M. Simmons

                                                    Suzanne Suter
- ---------------------------------          ---------------------------------
         J. R. Larson                               Suzanne Suter

</TABLE>






© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission