APACHE CORP
8-K, 1994-12-29
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1




                      SECURITIES AND EXCHANGE COMMISSION  
                            WASHINGTON, D.C.  20549



                                   FORM  8-K



                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE

                        SECURITIES EXCHANGE ACT OF 1934




Date of Report (Date of earliest event reported):  November 29, 1994




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




DELAWARE                               1-4300                         41-0747868
(State or other jurisdiction         (Commission                (I.R.S. Employer
of incorporation)                    File Number)                 Identification
                                                                         Number)




                            2000 POST OAK BOULEVARD
                                   SUITE 100
                           HOUSTON, TEXAS  77056-4400
                    (Address of Principal Executive Offices)

      Registrant's telephone number, including area code:  (713) 296-6000
<PAGE>   2
ITEM 5.  OTHER EVENTS

         On November 29, 1994, Apache Corporation ("Apache") entered into a
memorandum of understanding with Texaco Exploration and Production Inc.
("Texaco"), which is attached hereto as Exhibit 99.1 and incorporated herein by
reference, outlining the terms under which Apache will acquire Texaco's
interest in over 300 oil and gas fields for approximately $600 million, subject
to adjustments under certain circumstances.  Apache issued a press release,
dated November 29, 1994, which is attached hereto as Exhibit 99.2 and
incorporated herein by reference.

         On December 22, 1994, Apache and Texaco signed a definitive Purchase
and Sale Agreement, which is attached hereto as Exhibit 99.3 and incorporated
herein by reference.  The transaction remains subject to certain regulatory
approvals and is expected to close during the first quarter of 1995 with an
effective date of January 1, 1995.

ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

         (c)     Exhibits

                 EXHIBIT          DOCUMENT
                 -------          --------

                  99.1            Memorandum of Understanding, dated November
                                  29, 1994.

                  99.2            Press Release, dated November 29, 1994
                                  (Apache to acquire Texaco properties for $600
                                  million)

                  99.3            Purchase and Sale Agreement, dated December
                                  22, 1994, by and between Texaco Exploration
                                  and Production Inc., as seller, and Apache
                                  Corporation, as buyer.


                                   SIGNATURES

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

                                        APACHE CORPORATION


Date:  December 29, 1994                /s/ Zurab S. Kobiashvili
                                        Zurab S. Kobiashvili
                                        Vice President, General Counsel and
                                          Secretary





                                      2

<PAGE>   1
                                                                    EXHIBIT 99.1

                          MEMORANDUM OF UNDERSTANDING



         THIS Memorandum of Understanding is entered into this 29th day of
November, 1994 by and between Texaco Exploration and Production Inc. ("Seller")
and Apache Corporation ("Buyer").  Seller and Buyer are sometimes collectively
referred to as the "Parties."  This Memorandum of Understanding sets forth the
understandings and agreements of the Parties with respect to the purchase of
certain assets of Texaco:

         1.      THE PROPOSED TERMS OF SALE.  The Parties agree that it is
their mutual intent to complete negotiations on and to enter into a definitive
Purchase and Sale Agreement (the "Agreement"), substantially in the form
attached hereto as Exhibit "A" and to negotiate and agree upon all Schedules
and Exhibits to the Agreement.  For purpose of the Memorandum of Understanding,
except as otherwise expressly provided herein, the capitalized terms in the
Memorandum of Understanding shall have the same meaning assigned to them in the
Agreement.

         2.      DEFINITIVE AGREEMENT.  The Parties agree to use their best
efforts to negotiate diligently and in good faith to reach a final, definitive
agreement to be signed on or before December 22, 1994, if all corporate
approvals as counsel may deem reasonably necessary to enter into the Agreement
and if approval by executive management of each Party shall have been received.

         3.      NON-BINDING OBLIGATION.  Except for Paragraphs 4, 5, 6, 7, 8,
and 9 hereof, neither this Memorandum of Understanding nor any oral or written
communication between the Parties pertaining to the subject matter hereof shall
constitute a legally binding obligation.  The Parties shall not be bound until
the execution and delivery by the Parties of a final and definitive Agreement
pursuant to Paragraph 2 hereof.

         4.      TERM.  This Memorandum of Understanding shall expire without
further action of the Parties at 5:00 p.m. Houston time December 22, 1994
unless earlier terminated upon the occurrence of any of the following:  (a)
execution of the Agreement as contemplated by Paragraph 3 hereof; or (b) by
mutual written agreement of the Parties.  In the event that this Memorandum of
Understanding expires or terminates, all agreements between the Parties shall
terminate (except for the Confidentially Agreement) and Buyer shall take no
action that would indicate that Buyer has any right to claim any interest in
the Assets.

         5.      GOVERNING LAW.  This Memorandum of Understanding shall be
governed by and construed in accordance with the laws of the State of New York,
without reference to the conflicts of law principles thereof.  Any disputes
shall be resolved by binding arbitration in accordance with the rules of
commercial arbitration of the American Arbitration Association.
<PAGE>   2
         6.      EXCLUSIVE DEALING.  Until the execution of the Agreement,
except (i) as otherwise consented to by Buyer in writing, (ii) in connection
with the communications required to comply with preferential purchase rights,
or (iii) the termination of dealings with other parties with whom Seller has
previously communicated regarding the purchase of the Assets; Seller shall not
either directly or indirectly through a representative (a) provide information
to any Person or representative of such Person, which would assist such Person
in evaluating the prospects of purchasing the Assets, (b) initiate, encourage,
solicit, analyze or respond to any inquiries, offers, proposals, bids or other
investigations by any Person to acquire all or any of the Assets (other than to
indicate that the Assets are not for sale), (c) enter into or agree to enter
into any transactions, the result of which would interfere, hinder, delay or
materially change the effect of the transaction contemplated by the Agreement,
or (d) negotiate with any Person with respect to any such transaction.

         7.      CONFIDENTIALITY.  This Memorandum of Understanding shall be
subject to and governed by that certain confidentiality agreement between
Seller and Buyer dated September 2, 1994, as amended ("Confidentiality
Agreement").

         8.      PRESS RELEASE.  No Party will make any press release or public
announcement respecting the Memorandum of Understanding without the consent of
the other Party, unless the Party refuses to consent and the Parity desiring to
make the release or other announcement is required to comply with any statute,
law or regulation.

         9.      COSTS AND EXPENSES.  The Parties shall each pay their
respective expenses in connection with the transactions contemplated by this
Memorandum of Understanding.


         IN WITNESS WHEREOF, the Parties hereto have executed this Memorandum
of Understanding the day and date first above written.

                                           TEXACO EXPLORATION AND
                                           PRODUCTION, INC.


                                           /s/ Clarence P. Cazalot
                                           Clarence P. Cazalot
                                           President


                                           APACHE CORPORATION


                                           /s/ G. Steven Farris
                                           G. Steven Farris
                                           President and Chief Operating Officer

<PAGE>   1
                                                                    EXHIBIT 99.2


                              [Apache Letterhead]



Tuesday, November 29, 1994



              APACHE TO ACQUIRE TEXACO PROPERTIES FOR $600 MILLION
             PROPERTIES WILL INCREASE PROVED RESERVES BY 118 MMBOE


HOUSTON, TEXAS -- Apache Corporation and Texaco today announced that the
companies have entered into a memorandum of understanding outlining the terms
under which Apache will acquire Texaco's interest in over 300 oil and gas
fields for approximately $600 million.  The effective date of the transaction
is January 1, 1995, with closing expected in the first quarter of 1995.

The acquisition includes estimated net proved reserves of 81 million barrels
(MMBbls) of oil and 220 billion cubic feet of gas.  On an energy equivalent
basis, proved reserves total 118 MMBbls and are 69 percent crude oil.  The
acquired reserves represent a 51-percent increment over Apache's year-end 1993
total reserves.

The properties are highly concentrated with approximately two-thirds of the
reserves located in 54 fields and are in producing regions where Apache has
existing operations -- the Permian Basin, the Gulf Coast of Texas and
Louisiana, western Oklahoma, East Texas, the Rocky Mountains and the Gulf of
Mexico. Current average daily production from the properties is approximately
21,000 barrels of oil and 90 million cubic feet of natural gas. Apache will
operate approximately 68 percent of the production and hold an average
70-percent working interest in the operated properties.
<PAGE>   2
According to Apache Chairman and Chief Executive Officer Raymond Plank,  "This
acquisition is another important step in achieving our growth objectives and
furthers our pursuit in becoming a premier independent oil and gas producer.
The properties being acquired offer upside opportunities for increasing
reserves and profitability through drilling, workovers and recompletions,
application of 3-D seismic, as well as reductions in operating costs.
Additionally, they can be incorporated quickly into existing operations and
will provide economies of scale.  We are very pleased to have negotiated a
transaction with Texaco which results in continued growth for Apache, is
additive to per share earnings and cash flow, and enables Texaco to achieve one
of its strategic objectives."

Commenting on the sale, Texaco Exploration and Production Inc. President
Clarence P. Cazalot, Jr., said, "Achieving greater shareholder value by
focusing human resources and capital assets on our most profitable properties
is a cornerstone of our plan for growth.  The proceeds from this sale will be
redeployed into growth opportunities across the company, including major
expenditures on core producing properties in the U.S."

Consummation of the transaction is subject to negotiation and execution of a
definitive purchase and sale agreement, as well as approval by the respective
Board of Directors of both companies.

Apache Corporation is an independent energy company engaged in the exploration
for and development and production of natural gas and crude oil.  The company's
securities are traded on the New York and Chicago Stock Exchanges under the
symbol APA.

                                     # # #

Investor Relations:   Paul Korus           Media Relations:   Suzanne Best
                      713-296-6662                            713-296-6154

<PAGE>   1
                                                                EXHIBIT 99.3




                          PURCHASE AND SALE AGREEMENT

                                 BY AND BETWEEN

                     TEXACO EXPLORATION AND PRODUCTION INC.

                                     SELLER

                                      AND

                               APACHE CORPORATION

                                     BUYER



                            DATED DECEMBER 22, 1994
<PAGE>   2
                                                    TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                                                       Page
                                                                                                                       ----
<S>     <C>      <C>                                                                                                    <C>
PART 1  SUBJECT MATTER, DEFINITIONS AND RULES OF CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
        Section 1.1       Subject Matter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
        Section 1.2       Definitions.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                 Affiliate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                 Agreed Rate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                 Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                 Assets   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                 Assumed Liabilities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Beneficial Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Business Day   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Closing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Closing Date   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Code   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Confidentiality Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Contracts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Corporate Documents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Easements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Effective Date   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Excluded Facilities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Facilities   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Fee Interests  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Geotechnical Data Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Governmental Body  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 HSR Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Hydrocarbon Inventory  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Hydrocarbons   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Identification Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Included Facilities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Knowledge  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Leases   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Line Fill  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Losses   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Major Properties   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Material Contracts   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Other Contracts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Other Property   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Party  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
                 Person   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Plugging and Abandonment   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Property   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Subsidiary Agreements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Tax  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Third Person   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
</TABLE>





                                       i
<PAGE>   3
<TABLE>
<S>     <C>      <C>      <C>                                                                                          <C>
                 Transition Agreement   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
        Section 1.3       Other Definitions in the Agreement. . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
        Section 1.4       Rules of Construction.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
                 (a)      General.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
                 (b)      Parts and Sections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                 (c)      Exhibits and Schedules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                 (d)      Other Agreements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

PART 2  SALE AND PURCHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
        Section 2.1       Assets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
        Section 2.2       Purchase Price and Payment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                 (a)      The Purchase Price. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                 (b)      Purchase Price Payment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                 (c)      Deposit Interest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
        Section 2.3       Adjustments to the Purchase Price.  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                 (a)      Upward Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                 (b)      Downward Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                 (c)      Third Person Joint Interest Billings. . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
        Section 2.4       Allocation of Purchase Price  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
        Section 2.5       Transfer of the Assets, Etc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
        Section 2.6       Method of Payment.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

PART 3  REPRESENTATIONS AND WARRANTIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
        Section 3.1       Seller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 (a)      Organization and Standing.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 (b)      Authority.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 (c)      Validity of Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 (d)      No Violation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 (e)      Legal Proceedings.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 (f)      Compliance with Applicable Laws.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 (g)      Contracts.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 (h)      Authorizations for Expenditures.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 (i)      Affiliate Contracts.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 (j)      Status and Operation of Oil and Gas Assets. . . . . . . . . . . . . . . . . . . . . . . . .  15
                 (k)      Equipment.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 (l)      Wells.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 (m)      Exchange of Equipment.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 (n)      Payout Balances.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 (o)      No Consents Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 (p)      Tax Partnerships. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 (q)      Prepayment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 (r)      Payments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 (s)      Section 29 Tax Credits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 (t)      Conduct of Business.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
        Section 3.2       Buyer.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                 (a)      Organization and Standing.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                 (b)      Authority.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
</TABLE>





                                       ii
<PAGE>   4
<TABLE>
<S>     <C>      <C>      <C>                                                                                          <C>
                 (c)      Validity of Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                 (d)      No Violation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                 (e)      No Consents Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                 (f)      Securities Representation.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
        Section 3.3       Disclaimer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18

PART 4  COVENANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
        Section 4.1       Seller's Covenants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                 (a)      Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                 (b)      Affiliate Contracts.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
                 (c)      Exclusive Dealing.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
                 (d)      Conduct of Business.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                 (e)      Section 754 Election. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                 (f)      Delivery of Well List.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
        Section 4.2       Covenants of Buyer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                 (a)      Performance Bonds, Guaranties, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                 (b)      No Use of Texaco Mark.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                 (c)      Assumption of Assumed Liabilities.  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                 (d)      Security for Plugging and Abandonment.  . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                 (e)      Qualification to do Business in Illinois. . . . . . . . . . . . . . . . . . . . . . . . . .  22
        Section 4.3       Covenants of Seller and Buyer.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                 (a)      Compliance with Conditions Precedent. . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                 (b)      Preparation of Closing Documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                          (i)      Forms of Assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                          (ii)     Preliminary Settlement Statement.  . . . . . . . . . . . . . . . . . . . . . . . .  22
                          (iii)    Letters in Lieu  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                          (iv)     All Other Closing Documents. . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                 (c)      Recording.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                 (d)      Press Release.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                 (e)      Brokers.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                 (f)      Certain Filings, Consents and Permits.  . . . . . . . . . . . . . . . . . . . . . . . . . .  24
                 (g)      Risk of Loss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
                 (h)      Post-Closing Access.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
                 (i)      Financial Audit.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
                 (j)      Preferential Purchase Rights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
                 (k)      Required Consents.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                 (l)      Employee Matters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                 (m)      Final Recapitulation Settlement; Subsequent Audits and Settlements. . . . . . . . . . . . .  26
                 (n)      Further Assurances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                 (o)      Files Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                 (p)      Gas Balancing.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                 (q)      Plugging and Abandonment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                 (r)      Joint Use Facilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                 (s)      Easements.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30

PART 5  TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
</TABLE>





                                      iii
<PAGE>   5
<TABLE>
<S>     <C>      <C>      <C>                                                                                          <C>
        Section 5.1       Payment and Apportionment of Real Property Taxes and Personal Property Taxes  . . . . . . .  30
                 (a)      Real and Personal Property Taxes Other than in Wyoming, Colorado and Montana. . . . . . . .  30
                 (b)      Real and Personal Property Taxes in Wyoming, Colorado and Montana (and the Montana
                          Local Government Severance Tax).  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
                 (c)      Liability and Right to Pursue Claims. . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
        Section 5.2       Other Taxes.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
        Section 5.3       Sales Taxes.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
        Section 5.4       Tax Proceedings.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
        Section 5.5       Purchase Price Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32

PART 6  ENVIRONMENTAL MATTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
        Section 6.1       Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                          Environmental Claims  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                          Environmental Condition   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                          Environmental Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                          Environmental Matter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                          Expenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Independent Environmental Review  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Individual Threshold  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Property Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Remediation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Remediation Plan  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Retained Environmental Liabilities  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                          Transaction Deductible  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
        Section 6.2       Seller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                 (a)      Disclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                 (b)      Past Use of Property Interest.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
        Section 6.3       Buyer.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                 (a)      Independent Environmental Review. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                 (b)      Use of Reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
        Section 6.4       Due Diligence Procedure; Notice, Pre-Closing Date Remediation and Removal of
                          Properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
        Section 6.5       Seller's Responsibilities.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                 (a)      Seller's Indemnity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                 (b)      Limitations.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
                 (c)      Oil and Gas Purposes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
        Section 6.6       Buyer's Responsibilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
        Section 6.7       Covenant of Cooperation.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
        Section 6.8       Selection and Performance of Remedies.  . . . . . . . . . . . . . . . . . . . . . . . . . .  37
        Section 6.9       Procedure for Claiming Reimbursement; Defense of Claims.  . . . . . . . . . . . . . . . . .  38
        Section 6.10      Liquidation Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
        Section 6.11      Exclusive Remedies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39

PART 7  TITLE MATTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
        Section 7.1       Definitions for Title Matters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
</TABLE>





                                       iv
<PAGE>   6
<TABLE>
<S>     <C>      <C>      <C>                                                                                          <C>
                          Burdens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                          Deducible of Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                          Defensible Title  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                          Encumbrance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                          Interest Addition   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                          Net Revenue Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                          Permitted Encumbrances  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                          Title Defect  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
                          Working Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
        Section 7.2       Title Defect Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
        Section 7.3       Seller's Right to Cure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
        Section 7.4       Contested Title Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
        Section 7.5       Title Indemnity Payments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
        Section 7.6       Interest Additions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
        Section 7.7       Reconveyance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43

PART 8  INDEMNITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
        Section 8.1       General Indemnification.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                 (a)      Seller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                 (b)      Buyer.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
        Section 8.2       Method of Asserting Claims, Etc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
                 (a)      Third Person Claims.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
                 (b)      Other Claims. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
        Section 8.3       Payment.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
                 (a)      Payment of Undisputed Amount. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
                 (b)      Interest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
        Section 8.4       Disputed Claims.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
        Section 8.5       Applicability of Part 8.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46

PART 9  CONDITIONS PRECEDENT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
        Section 9.1       Conditions Precedent of Buyer.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
                 (a)      Representations and Warranties True at Closing. . . . . . . . . . . . . . . . . . . . . . .  46
                 (b)      Compliance with Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (c)      Certified Resolutions and Officers' Certificate.  . . . . . . . . . . . . . . . . . . . . .  47
                 (d)      Approval of Proceedings.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (e)      Opinion of Counsel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (f)      Injunction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (g)      Conveyance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (h)      Geotechnical Data Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (i)      Transition Agreement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (j)      Letters in Lieu.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (k)      No Material Adverse Change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 (l)      HSR Act.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
        Section 9.2       Conditions Precedent of Seller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                 (a)      Representations and Warranties True at Closing. . . . . . . . . . . . . . . . . . . . . . .  48
                 (b)      Compliance with Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                 (c)      Certified Resolutions and Officers' Certificate.  . . . . . . . . . . . . . . . . . . . . .  48
</TABLE>





                                       v
<PAGE>   7
<TABLE>
<S>     <C>      <C>      <C>                                                                                          <C>
                 (d)      Approval of Proceedings.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                 (e)      Opinion of Counsel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                 (f)      Injunction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                 (g)      Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 (h)      Conveyance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 (i)      Transition Agreement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 (j)      Letters in Lieu.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 (k)      HSR Act.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 (l)      Geotechnical Data Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49

PART 10          MISCELLANEOUS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
        Section 10.1      Notices.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
        Section 10.2      Modification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
        Section 10.3      Governing Law.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
        Section 10.4      Assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
        Section 10.5      Counterparts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
        Section 10.6      Invalidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
        Section 10.7      Confidentiality.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                 (a)      Confidentiality Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                 (b)      Seller Confidentiality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                 (c)      Buyer Confidentiality.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
        Section 10.8      Entire Agreement and Construction.  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
        Section 10.9      Expenses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
        Section 10.10     Waivers and Amendments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
        Section 10.11     Survival of Warranties, Representations and Covenants.  . . . . . . . . . . . . . . . . . .  54
        Section 10.12     Section Headings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
        Section 10.13     Termination.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
        Section 10.14     Dispute Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55
</TABLE>





                                       vi
<PAGE>   8
                             EXHIBITS AND SCHEDULES

<TABLE>
<S>                           <C>
Exhibit A-1 - A-8             Assignments
Exhibit B-1 - B-3             Deeds
Exhibit C -                   Form of Geotechnical Data Agreement
Exhibit D -                   Form of Transition Agreement
Exhibit E -                   Form of Seller's Opinion of Counsel
Exhibit F -                   Form of Buyer's Opinion of Counsel


Schedule A-1 - A-343          Leases
Schedule B-1 - B-343          Fee Interests
Schedule C-1 - C-343          Easements
Schedule D                    Beneficial Interest
Schedule E                    Maps Showing Included Properties
Schedule F                    Certain Excluded Assets - Equipment, Facilities
Schedule G                    Material Contracts
Schedule H                    Properties; Allocated Values; Net Revenue Interests; Working Interests
Schedule I                    Additional Field Offices and Certain Additional Facilities
Schedule 3.1(e)               Legal Proceedings
Schedule 3.1(f)               Exceptions to Compliance with Laws
Schedule 3.1(g)               Exceptions to Contract Warranties
Schedule 3.1(h)               AFEs and Related Information
Schedule 3.1(i)               Affiliate Contracts
Schedule 3.1(j)               Continuous Development Obligations and Royalty Increases
Schedule 3.1(l)               Well Information
Schedule 3.1(n)               Payout Balances
Schedule 3.1(o)               Seller Consents Required/Preferential Purchase Rights
Schedule 3.1(p)               Tax Partnerships
Schedule 3.1(s)               Coal Seam Gas Wells
Schedule 3.1(t)               Exceptions to Conduct of Business
Schedule 6.1                  Retained Environmental Responsibilities
Schedule 6.2                  Waste Disposal Sites
Schedule 6.9                  Environmental Processing and Reimbursement Protocol
Schedule 7.1                  Permitted Encumbrances
Schedule 10.14                Dispute Resolution Procedure
</TABLE>





                                      vii
<PAGE>   9
                          PURCHASE AND SALE AGREEMENT


        The Agreement dated as of December 22, 1994, is made and entered into
by and between Texaco Exploration and Production Inc., a Delaware corporation,
having an office at 1111 Bagby, Houston, Texas 77002-0200 ("Seller") and Apache
Corporation, a Delaware corporation, having an office at 2000 Post Oak
Boulevard, Suite 100, Houston, Texas 77056-4400 ("Buyer").


                                     PART 1

             SUBJECT MATTER, DEFINITIONS AND RULES OF CONSTRUCTION

        Section 1.1       Subject Matter.  The subject matter of the Agreement
is the sale, assignment, transfer and conveyance of Seller's and Seller's
Affiliates' interest in the Assets, the purchase of the Assets and the
assumption of the Assumed Liabilities by Buyer, and the terms and conditions
upon which the sale shall take place.

        Section 1.2       Definitions.  For purposes of the Agreement, except
as otherwise expressly provided or unless the context otherwise requires, the
terms defined in Section 1.2 have the meanings herein assigned to them and the
capitalized terms defined elsewhere in the Agreement, by inclusion in quotation
marks and parentheses, shall have the meanings so ascribed to them.

        "Affiliate" means, with respect to any specified Person, any other
        Person directly or indirectly controlling or controlled by or under
        direct or indirect common control with such specified Person.  For the
        purposes of this definition, "control" means the power to direct the
        management and policies of such Person, directly or indirectly, whether
        through the ownership of voting securities, by contract or otherwise;
        and the terms "controlling" and "controlled" have meanings correlative
        to the foregoing, it being understood and agreed that with respect to a
        corporation, control shall mean a direct or indirect ownership of more
        than fifty percent (50%) of the voting stock.

        "Agreed Rate" means a rate per annum calculated on a 360-day basis
        which is equal to the lesser of (a) a rate which is one percent (1%)
        above the prime rate of interest of Chemical Bank, New York, New York,
        as announced or published by such bank from time to time (adjusted from
        time to time to reflect any changes in such rate determined hereunder),
        or (b) the maximum rate from time to time permitted by applicable Law.

        "Agreement" means this Purchase and Sale Agreement, including the 
        Schedules and Exhibits.

        "Assets" means the Fee Interests, Leases, Other Property, Easements,
        Contracts, and Beneficial Interest but not including:





                                       1
<PAGE>   10
                 (a)      all (i) trade credits, accounts receivable, notes
        receivables and other receivables attributable to Seller's interest in
        the Assets with respect to any period of time prior to the Effective
        Date; (ii) deposits, cash, checks in process of collection, cash
        equivalents and funds attributable to Seller's interest in the Assets
        with respect to any period of time prior to the Effective Date; and
        (iii) funds attributable to Third Persons for production prior to the
        Effective Date but suspended or impounded by Seller;

                 (b)      all claims and causes of action of Seller (i) arising
        from acts, omissions or events, or damage to or destruction of
        property, occurring prior to the Effective Date, or (ii) affecting any
        of the excluded assets as set forth in (a) through (o) of this
        definition;

                 (c)      except as set forth in Section 4.3(g), all rights,
        titles, claims and interests of Seller (i) under any policy or
        agreement of insurance or indemnity; (ii) under any bond; or (iii) to
        any insurance or condemnation proceeds or awards;

                 (d)      the claims of Seller for refunds of or loss carry
        forwards with respect to (i) Taxes attributable to any period prior to
        the Effective Date; or (ii) Taxes attributable to any of the excluded
        assets as set forth in (a) through (o) of this definition;

                 (e)      all amounts due or payable to Seller as adjustments
        or refunds under any Contracts affecting the Assets, with respect to
        any period prior to the Effective Date, specifically including, without
        limitation, amounts recoverable from audits under operating agreements;

                 (f)       all amounts due or payable to Seller as adjustments
        to insurance premiums related to the Assets with respect to any period
        prior to the Effective Date;

                 (g)      all proceeds, benefits, income or revenues accruing
        (and any security or other deposits made) with respect to (i) the
        Assets prior to the Effective Date; and (ii) any of the excluded assets
        as set forth in (a) through (o) of this definition;

                 (h)      all of Seller's seismic, geophysical, geological,
        geochemical, and other geotechnical information and data not
        specifically transferred or licensed to Buyer in the Geotechnical Data
        Agreement;

                 (i)      all of Seller's intellectual property including, but
        not limited to, computer software (except as otherwise expressly
        provided herein), patents, trade secrets, copyrights, names, marks, and
        logos, other than data subject to the Geotechnical Data Agreement;

                 (j)      any pipelines, easements, fixtures, tanks or
        equipment located on the Assets which belong to lessors or Third
        Persons;

                 (k)      records and documents subject to confidentiality
        provisions, claims of privilege, or other restrictions on access,
        except as otherwise expressly provided herein;





                                       2
<PAGE>   11
                 (l)      all corporate, financial, legal and tax records of
        Seller, except as otherwise expressly provided herein;

                 (m)      Excluded Facilities;

                 (n)      Seller's electronic mapping data and digital images
        of documents; and

                 (o)      Seller's general partnership interest under the
        Ferguson 1978 Limited Partnership.

        "Assumed Liabilities" means:

                 (a)      all liabilities, duties, and obligations that arise
        from ownership or operation of the Assets on and after the Effective
        Date or otherwise expressly assumed under the Agreement;

                 (b)      liabilities and obligations with respect to Plugging
        and Abandonment to the extent provided in Section 4.3(q);

                 (c)      all duties, liabilities and obligations that arise
        under the Contracts on and after the Effective Date; and

                 (d)      all obligations in regard to gas imbalances with
        respect to the Properties, except the obligations of Seller under
        Section 4.3(p).

        "Beneficial Interest" means those other property interests as set forth
        on and created by virtue of the Contracts listed on Schedule D.

        "Business Day" means any day when commercial banks are generally open
        for regular business in the states of New York and Texas.

        "Closing" means the closing of the transactions contemplated by the
        Agreement at 10:00 a.m., Houston, Texas time, at Seller's offices at
        1111 Bagby, Houston, Texas, on the Closing Date or at such other time
        or place as the Parties may mutually agree upon in writing.

        "Closing Date" means March 1, 1995, or such other date as the Parties
        may mutually agree upon in writing; provided, however, that either
        Party may by notice to the other Party no later than fourteen (14) days
        prior to March 1, 1995, extend the Closing Date until a Business Day on
        or before March 31, 1995.

        "Code" means the United States Internal Revenue Code of 1986, as
        amended.

        "Confidentiality Agreement" means the Confidentiality Agreement between
        Seller and Buyer dated September 2, 1994, as amended.





                                       3
<PAGE>   12
        "Contracts" means the Material Contracts, the Affiliate Contracts and 
        the Other Contracts.

        "Corporate Documents" means with respect to a Delaware corporation the
        Certificate of Incorporation and By-Laws or the equivalent documents of
        a corporation organized under the laws of another jurisdiction.

        "Easements" means Seller's non-exclusive rights to the use and
        occupancy of the surface, including, without limitation, tenements,
        appurtenances, surface leases, easements, permits, licenses, servitudes
        and rights-of-way in any way appertaining, belonging, affixed or
        incidental to or used in connection with the ownership or operation of
        the Leases, Fee Interests, and Beneficial Interest including, without
        limitation, as set forth on Schedules C-1 through C-343.

        "Effective Date" shall mean 7:00 a.m., January 1, 1995, at the location
        of the Assets.

        "Excluded Facilities" means Facilities that are:

                 (a)      neither located on nor used in connection with the
        Leases, Fee Interests or Beneficial Interest;

                 (b)      of a regional nature not associated with any
        particular field area (for example, meter proving facilities, oil spill
        facilities, fire training facilities and the like);

                 (c)      not located on, or are located both on and off the
        Leases, Fee Interests Beneficial Interest or Easements and which are
        used in connection with both the Leases, Fee Interests, Beneficial
        Interest or Easements, as well as Seller's retained properties;

                 (d)      regulated by the FERC or other Governmental Body and
        used in connection with Third Person Hydrocarbons; and

                 (e)      as set forth on Schedule F, provided the Parties
        shall use good faith reasonable efforts to correct and supplement
        Schedule F on or before Closing.

        "Facilities" means facilities and equipment that are customarily used
        directly in the production of Hydrocarbons, including, but not limited
        to injection facilities, disposal facilities, field separators, liquid
        extractors, compressors, gathering systems, lines, LACT units, plants,
        platforms, tanks and the like.

        "Fee Interests" means (a) all right, title and interest owned by Seller
        in all the fee, mineral fee and fee royalty interests described and set
        forth on Schedules B-1 through B-343, insofar and only insofar as such
        interests cover the lands and depths set forth on Schedules B-1 through
        B-343, and (b) all right, title and interest owned by Seller in all the
        fee, mineral fee and fee royalty interests in or under the lands
        depicted as included on the maps attached as Schedule E; but excluding
        in the case of (a) or (b) Seller's interest in the depths or other
        interests expressly set forth as excluded on Schedules B-1 through
        B-343.





                                       4
<PAGE>   13
        "Geotechnical Data Agreement" means the agreement to be entered into
        between Buyer and Seller at Closing, substantially in the form of
        Exhibit C.

        "Governmental Body" means any federal, state, tribal, county,
        municipal, or other federal, state or local governmental authority or
        judicial or regulatory agency, board, body, department, bureau,
        commission, instrumentality, court, tribunal or quasi-governmental
        authority in any jurisdiction (domestic or foreign) having jurisdiction
        over any Asset or Party to this transaction, or any of the transactions
        or matters contemplated by the Agreement.

        "HSR Act" means the Hart Scott Rodino Antitrust Improvement Act of 
        1976, as amended.

        "Hydrocarbon Inventory" means all processed merchantable oil,
        condensate and natural gas liquids inventories in storage or existing
        in oil stock tanks above the outlet flange delivery point and credited
        to the Assets as of the Effective Date.

        "Hydrocarbons" means crude oil, natural gas, casinghead gas,
        condensate, sulphur, natural gas liquids, plant products and other
        liquid or gaseous hydrocarbons (of whatever nature and kind, including
        coalbed gas), all other gases (including CO2), and all other minerals
        and gases of every kind and character which may be covered by or
        included in the Assets.

        "Identification Date" means (a) November 18, 1994 as to the Golden
        Meadow, Ft. Stockton (South) and Monahans North fields and the portions
        of the Crossett, Tex/Hamon, P.L. Fuller, Caprito and Harper fields
        added to the Assets in November, 1994, and (ii) October 17, 1994 as to
        all other Assets.

        "Included Facilities" means the following Facilities except for the
        Excluded Facilities:

                 (i)      located on or off of, but used solely in connection
        with the Leases, Fee Interests and Beneficial Interest; and

                 (ii)     located entirely on and used in connection with the
        Leases, Fee Interests and Beneficial Interest and properties retained
        by Seller.

        "Knowledge" means the actual knowledge of a Party's corporate officers,
        division managers, their direct reports, area managers, and operation
        managers, after reasonable inquiry.

        "Leases" means (a) all right, title and interest owned by Seller in the
        oil, gas or mineral leases and other interests as set forth on
        Schedules A-1 through A-343, insofar and only insofar as such interests
        cover the lands and depths set forth on Schedules A-1 through A-343;
        and (b) all right, title and interest owned by Seller in the oil, gas
        or mineral leases and other interests in or under lands depicted as
        included on the maps attached as Schedule E; but excluding in the case
        of (a) or (b): (i) Seller's interest in the depths





                                       5
<PAGE>   14
        expressly set forth as excluded on Schedules A-1 through A-343, and
        (ii) the overriding royalty interests set forth as excluded on
        Schedules A-1 through A-343.

        "Line Fill" means all Hydrocarbons in lines, gathering systems, plant
        equipment, treating and separation equipment and gunbarrels located on
        or allocable to the Assets and occurring prior to the delivery point or
        outlet flange for liquids or prior to the gas sales meter for gases.

        "Losses" means any and all losses, costs, expenses, liabilities,
        claims, demands, penalties, fines, assessments, settlements, damages
        and any related expenses of whatever kind or nature, or otherwise
        including, without limitation, legal, accounting, consulting and
        investigation expenses and litigation costs, but excluding
        consequential damages of a Party other than losses directly
        attributable to a cessation or reduction of the production of
        Hydrocarbons.

        "Major Properties" means those properties set forth on Schedule H and
        identified by asterisks thereon.

        "Material Contracts" means the contracts of Seller material to the
        Leases, Fee Interests, Beneficial Interest and Other Property, and the
        transportation, marketing and processing of Hydrocarbons produced
        therefrom listed on Schedules D and G, insofar and only insofar as they
        specifically relate to the Leases, Fee Interests, Beneficial Interest
        and Other Property, but specifically excluding Easements and Leases.

        "Other Contracts" means any contracts, agreements or arrangements of
        Seller affecting the Leases, Fee Interests, Beneficial Interest and
        Other Property other than the Material Contracts and Affiliate
        Contracts, insofar and only insofar as they specifically relate to the
        Leases, Fee Interests, Beneficial Interest and Other Property, but
        specifically excluding the Easements, the Leases, and the Beneficial
        Interest.

        "Other Property" means all of Seller's or its Affiliates' right, title
        and interest in and to the following, but specifically excluding the
        Excluded Facilities:

                 (a)      all wells, equipment and personal property of any
        kind located on the Fee Interests, Leases, Easements, Contracts and
        Beneficial Interest as of the Identification Date, or used solely in
        connection with the production, separation, storage, treatment,
        gathering or transportation of Hydrocarbons therefrom, including, but
        not limited to, tubing, casing, wellheads, pumping units, production
        units, compressors, valves, meters, flowlines, tanks, heaters,
        separators, dehydrators, pumps, injection units, gates and fences,
        pulling machines, warehouse stocks, microwave equipment;

                 (b)      computer equipment, remote telemetry units, host
        units, licenses and source codes, design and maps of automated systems
        to the extent located on and integral to automation systems on the Fee
        Interests, Leases, Easements and Beneficial Interest;

                 (c)      vehicles, vehicle leases, trailers, boats, testing
        equipment, sampling equipment, gravimeters, calorimeters, mobile test
        separators, tools, cellular phones,





                                       6
<PAGE>   15
        radios, fluid level guns and dynamometers to the extent used by any
        employee or independent contractor of Seller that is hired by Buyer or
        with which Buyer contracts within sixty (60) days following Closing,
        and that would be necessary or convenient for such employee or
        contractor to continue to use in the employment of the Buyer after the
        Closing;

                 (d)      except as set forth on Schedule F, yard inventory and
        yard equipment that is charged to or is reasonably chargeable to the
        Leases, Fee Interests, Beneficial Interest or Easements, and which have
        been used primarily in connection with the Fee Interests, Leases,
        Easements, Contracts and Beneficial Interest;

                 (e)      subject to required Third Person consents, all
        licenses, authorizations, permits, variances and similar rights and
        interests related to the Fee Interests, Leases, Easements, Contracts
        and Beneficial Interest and the property defined in (a) through (d)
        above;

                 (f)      the Geotechnical Data Agreement;

                 (g)      subject to Section 4.3(o), the applicable general
        operating records, lease operating statements, well files (including
        applicable well logs and production data), production records, logs,
        information and engineering data relating to the Assets, lease files,
        land files, regulatory reports and certificates, abstracts and title
        work pertaining to the Fee Interests, Leases, Easements, Contracts and
        Beneficial Interest and property defined in (a) through (e) above, but
        excluding: environmental compliance files (other than the portions of
        such files which pertain to the Assets), legal files not pertaining to
        Assumed Liabilities, attorney-client communications or attorney work
        product materials and other similar documents covered by privilege,
        records and documents subject to confidentiality provisions, auditor's
        reports, and the geophysical data base of Seller (other than that data
        and information specifically covered by the Geotechnical Data
        Agreement);

                 (h)      Hydrocarbon Inventory and Line Fill;

                 (i)      all rights, interests and benefits to gas imbalances
        with respect to the Properties;

                 (j)      the Included Facilities;

                 (k)      field offices and the furniture and fixtures therein
        as set forth on Schedule I; and

                 (l)      all other rights, privileges, benefits and powers
        conferred upon the owner and holder of the Fee Interests, Leases,
        Easements, Contracts and Beneficial Interest and property defined in
        (a) through (k) above.

        "Party" means either Buyer or Seller.





                                       7
<PAGE>   16
        "Person" means any individual, corporation, partnership, limited
        liability company, joint venture, association, joint stock company,
        trust, estate, unincorporated organization, other business entity or
        any Governmental Body.

        "Plugging and Abandonment" means all plugging and abandonment of wells,
        and associated removal of Other Property, the removal, capping or
        burying of all associated flowlines, the restoration of the surface,
        site clearance, and any disposal of related waste materials, including
        naturally occurring radioactive material (NORM) and asbestos on the
        Other Property removed.  Plugging and Abandonment does not cover
        cleanup of polluted lands, air or water other than routine surface
        cleanup of the drillsite area normally associated with plugging and
        abandonment.

        "Property" means an accounting unit as set forth on Schedule H which is
        utilized by Seller for allocation of revenues and expenses from the
        associated Leases, Fee Interests and Beneficial Interest.

        "Subsidiary Agreements" means the Transition Agreement and the
        Geotechnical Data Agreement.

        "Tax" means any and all fees (including, without limitation,
        documentation, license, recording, filing and registration fees), taxes
        (including without limitation, production, gross receipts, ad valorem,
        value added, windfall profit tax, environmental tax, turnover, sales,
        use, property (tangible and intangible), stamp, leasing, lease, user,
        leasing use, excise, franchise, transfer, heating value, fuel, excess
        profits, occupational, interest equalization, lifting, oil, gas, or
        mineral production or severance, and other taxes), levies, imposts,
        duties, charges or withholdings of any nature whatsoever, imposed by
        any Governmental Body or taxing authority thereof, domestic or foreign,
        together with any and all penalties, fines, additions to Tax and
        interest thereon, whether or not such Tax shall be existing or
        hereafter adopted.

        "Third Person" means a Person other than a Party or an Affiliate of a
        Party.

        "Transition Agreement" means the agreement to be entered into between
        Buyer and Seller at Closing, substantially in the form of Exhibit D.

        Section 1.3       Other Definitions in the Agreement.  The following
terms shall have the respective meanings ascribed to them in the Sections of
the Agreement set forth below opposite such terms:





                                       8
<PAGE>   17
<TABLE>
<CAPTION>
                                                    Section                                                            Section
                 <S>                                <C>                      <C>                                       <C>
                 Accounting Firm                    4.3(m)(ii)               Interest Addition                         7.1
                 Affiliate Contracts                3.1(i)                   Interest Addition Notice                  7.6
                 Allocated Value                    2.4                      Interest Addition Rejection
                 Assignments                        2.5                        Notice                                  7.6
                 Burdens                            7.1                      Interest Addition Value                   7.6
                 Buyer Confidential                                          Joint Use Facility                        4.3(r)
                   Information                      10.7(b)                  Laws                                      3.1(f)
                 Claim Notice                       8.2(a)                   Letters in Lieu                           4.3(b)(iii)
                 Closing Amount                     2.2(b)(ii)               NGPA                                      3.1(s)(i)
                 Cure                               7.3                      NGPA Regulations                          3.1(s)(ii)
                 Cure Notice                        7.3                      Net Revenue Interest                      7.1
                 Deducible of Record                7.1                      Notice Period                             8.2(a)
                 Deeds                              2.5                      Offset                                    7.6
                 Defect Value                       7.2                      Permitted Encumbrances                    7.1
                 Defensible Title                   7.1                      Preliminary Settlement Statement          4.3(b)(ii)
                 Deposit                            2.2(b)(i)                Property Interest                         6.1
                 Disputed Claim                     8.4                      Purchase Price                            2.2(a)
                 Employees                          4.3(l)                   Real and Personal Property
                 Encumbrance                        7.1                        Taxes                                   5.1(a)
                 Environmental Claims               6.1                      Rejection Notice                          7.4
                 Environmental Condition            6.1                      Remediation                               6.1
                 Environmental Law                  6.1                      Remediation Plan                          6.1
                 Environmental Matter               6.1                      Representatives                           10.7(b)
                 Expenses                           6.1                      Retained Environmental
                 FERC                               3.1(s)(ii)                 Liabilities                             6.1
                 Final Recap                        4.3(m)(i)                Seller Confidential Information           10.7(c)
                 Final Recap Statement              4.3(m)(i)                Title Defect                              7.1
                 Indemnified Party                  8.2(a)                   Title Defect Notice(s)                    7.2
                 Indemnifying Party                 8.2(a)                   Title Indemnity Payment                   7.2
                 Independent Environmental                                   Transaction Deductible                    6.1
                   Review                           6.1                      WCM Real and Personal Property
                 Individual Threshold               6.1                        Taxes                                   5.1(b)
                                                                             Working Interest                          7.1
</TABLE>

        Section 1.4       Rules of Construction.  For purposes of the Agreement:

                 (a)      General.  Unless the context otherwise requires (i)
        "or" is not exclusive; (ii) an accounting term not otherwise defined
        has the meaning assigned to it in accordance with accounting principles
        that are generally accepted in the United States of America; (iii)
        words in the singular include the plural and words in the plural
        include the singular; (iv) words in the masculine include the feminine
        and words in the feminine include the masculine; (v) any date specified
        for any action that is not a Business Day shall be deemed to mean the
        first Business Day after such date; and (vi) a reference to a Person
        includes its successors and assigns.





                                       9
<PAGE>   18
                 (b)      Parts and Sections.  References to Parts and Sections
        are, unless otherwise specified, to Parts and Sections of the
        Agreement.  Neither the captions to Parts or Sections hereof nor the
        Table of Contents shall be deemed to be a part of the Agreement.

                 (c)      Exhibits and Schedules.  The Exhibits and Schedules
        form part of the Agreement and shall have the same force and effect as
        if set out in the body of the Agreement.

                 (d)      Other Agreements.  References herein to any agreement
        or other instrument shall, unless the context otherwise requires (or
        the definition thereof otherwise specifies), be deemed references to
        that agreement or instrument as it may from time to time be changed,
        amended or extended.  There is no incorporation by reference unless
        stated.


                                     PART 2

                               SALE AND PURCHASE

        Section 2.1       Assets.  At the Closing, Seller shall and shall cause
its Affiliates to sell, assign, transfer and convey to Buyer the Assets and
enter into the Subsidiary Agreements and Buyer shall purchase and pay for the
Assets, assume the Assumed Liabilities and enter into the Subsidiary
Agreements.

        Section 2.2       Purchase Price and Payment.  With respect to the
purchase price:

                 (a)      The Purchase Price.  The purchase price shall be the
        sum of the following, adjusted pursuant to Section 2.3 ("Purchase
        Price"):

                          (i)      Five Hundred Ninety-Five Million Five
                 Hundred Seventeen Thousand Four Hundred Dollars
                 ($595,517,400); plus

                          (ii)     interest on Five Hundred Seventy Million
                 Five Hundred Seventeen Thousand Four Hundred Dollars
                 ($570,517,400) accrued at the Agreed Rate from March 1, 1995
                 until the Closing Date if the Closing Date is delayed beyond
                 March 1, 1995 solely on account of an extension of the Closing
                 Date requested by Buyer or based on the failure of Buyer to
                 close after the fulfillment of all conditions set forth in
                 Section 9.1.

                 (b)      Purchase Price Payment.  The Purchase Price shall be
        paid by Buyer to Seller in two installments as follows:

                          (i)      on the date of the execution of the
                 Agreement, Twenty-Five Million Dollars ($25,000,000) (the
                 "Deposit"); and

                          (ii)     at Closing, the Purchase Price, as adjusted
                 pursuant to Section 4.3(b)(ii) less the sum of the Deposit and
                 the Deposit interest as set forth in Section 2.2(c) (the
                 "Closing Amount").





                                       10
<PAGE>   19
                 (c)      Deposit Interest.  Interest shall accrue on the
        Deposit at the Agreed Rate:

                          (i)      from the date of the Agreement until March 
                 1, 1995; and

                          (ii)     from March 1, 1995 to the Closing Date, if
                 the Closing is delayed beyond March 1, 1995 solely on account
                 of an extension of the Closing Date requested by Seller or
                 based on the failure of Seller to close after the fulfillment
                 of all conditions set forth in Section 9.2.

        Section 2.3       Adjustments to the Purchase Price.  The Purchase
Price shall be adjusted at Closing pursuant to Section 4.3(b)(ii) and, after
Closing, pursuant to Section 4.3(m) as follows:

                 (a)      Upward Adjustments.  The Purchase Price shall be
        adjusted upward by the following:

                          (i)      subject to Section 2.3(c), the amount of all
                 direct costs and expenditures chargeable to Seller's interest
                 incurred and paid by or on behalf of Seller (A) that are
                 attributable to the drilling, completion, recompletion,
                 reworking, operation and maintenance of the Assets on and
                 after the Effective Date, (B) bonuses, lease rentals and
                 shut-in payments due after (and expressly excluding those due
                 before) the Effective Date, (C) ad valorem, property and other
                 Taxes that are allocated to the Buyer pursuant to Part 5, and
                 (D) amounts relating to obligations arising under the
                 Contracts with respect to operations or production after the
                 Effective Date;

                          (ii)     the value (based on the average December
                 1994 sales price from the Properties) of the Hydrocarbon
                 Inventory net of all Taxes and Burdens, and less an
                 appropriate deduction based on industry practice for basic
                 sediment, water and other non-merchantable liquids;

                          (iii)    the payments received by Seller from Third
                 Persons for overhead under operating agreements for operations
                 conducted during the period from the Effective Date through
                 the Closing Date;

                          (iv)     One Hundred Thousand Dollars ($100,000) per
                 month, prorated for any portion thereof from the Effective
                 Date to the Closing Date; and

                          (v)      any other amount agreed upon by Seller and
                 Buyer.

                 (b)      Downward Adjustments.  The Purchase Price shall be
        adjusted downward by the following:

                          (i)      the amount of all proceeds received by
                 Seller that are attributable to the ownership and operation of
                 the Assets on or after the Effective Date through the Closing
                 Date, including, without limitation:

                                   (A)     gross proceeds (net of Burdens) for
                          Hydrocarbons sold; and





                                       11
<PAGE>   20
                                   (B)     the higher of the Allocated Value or
                          the proceeds from the disposition (with the consent
                          of Buyer, when required, as provided in Section
                          4.1(d)(ii)) of all or any portion of the Assets.

                          (ii)     subject to Section 2.3(c), the amount of (A)
                 all direct unrelated Third Person costs and expenditures
                 chargeable to Seller's interest and not paid by Seller that
                 are attributable to the drilling, completion, recompletion,
                 reworking, operation and maintenance of the Assets prior to
                 the Effective Date, (B) all bonuses, lease rentals and shut-in
                 payments due prior to the Effective Date and not paid by
                 Seller, and (C) amounts relating to obligations arising under
                 the Contracts, and COPAS charges all with respect to
                 operations and production prior to the Effective Date and not
                 paid by Seller and paid or assumed by Buyer;

                          (iii)    the net amount of any Title Indemnity
                 Payments;

                          (iv)     the amount of all agreed upon or settled
                 indemnity claims made pursuant to Section 6.4 or for
                 Environmental Matters for which Seller is liable pursuant to
                 Section 6.5 that are known and agreed upon or settled as of
                 the time of Closing;

                          (v)      the amount payable pursuant to Section 
                 4.3(g) for any casualty loss; and

                          (vi)     any other amount agreed upon by Seller and
                 Buyer.

                 (c)      Third Person Joint Interest Billings.  In order to
        simplify accounting for the adjustments provided in this Section 2.3,
        joint interest billing costs payable to Third Persons, other than
        drilling or capital costs, shall be handled as follows:

                          (i)      the costs reflected in a billing with a
                 billing date in January 1995, shall be deemed to be
                 attributable to the period prior to the Effective Date;

                          (ii)     the costs reflected in a billing with a
                 billing date in February 1995, shall be deemed to be
                 attributable fifty percent (50%) to the period prior to the
                 Effective Date and fifty percent (50%) to the period after the
                 Effective Date; and

                          (iii)    the costs reflected in a billing with a
                 billing date on or after March 1, 1995, shall be deemed to be
                 attributable to the period following the Effective Date.

        Section 2.4       Allocation of Purchase Price.  Schedule H sets forth
an allocation of the Purchase Price among Properties and other designated items
that comprise the Assets, which allocation was prepared by Buyer (the
"Allocated Value").  The allocation has been provided for the purpose of (a)
establishing a basis for certain Taxes, (b) obtaining waivers of or making
offers with respect to any preferential rights to purchase the Assets, and (c)
handling those instances for which the Purchase Price is adjusted as provided
herein.  If necessary to determine the Allocated Value of a portion of any
Property for which an Allocated Value is set forth on





                                       12
<PAGE>   21
Schedule H, Buyer's reasonable evaluation engineering performed prior to the
execution of the Agreement and used to establish the Allocated Value for the
entire Property (if any) shall govern the allocation to such portion, and if no
such engineering was performed, such allocation shall be determined on a
reasonable engineering basis consistent with the evaluation implicit in the
Allocated Value shown on Schedule H.

        Section 2.5       Transfer of the Assets, Etc.  At the Closing, Seller
and Buyer shall execute and acknowledge, and Seller shall deliver, the
assignments which are contained in Exhibits A-1 through A-8 (the
"Assignments"), the deeds which are contained in Exhibits B-1 through B-3 (the
"Deeds"), as well as such certificates or other documents as are required to
effect the transfer of the Assets, or the subsequent operation thereof.  Buyer
and Seller shall also execute and deliver such change of operator forms as are
required by applicable Governmental Bodies to transfer operatorship of the
Assets to Buyer.

        Section 2.6       Method of Payment.  Any amount payable under the
Agreement shall be payable in immediately available funds by means of a wire
transfer, if to Seller, to Seller's account at The Chase Manhattan Bank,
Brooklyn, New York, ABA # 021000021, account number 9102582567 (with immediate
telephone notice to Frank Scherma, (914) 253-6071), or if to Buyer, to Buyer's
account as may be designated by Buyer or to such other account number and
depository as Seller or Buyer may by written notice direct.


                                     PART 3

                         REPRESENTATIONS AND WARRANTIES

        Section 3.1       Seller.  Seller represents and warrants to Buyer that:

                 (a)      Organization and Standing.  Seller has been duly
        organized, validly existing in good standing under the laws of the
        State of Delaware and is in good standing as a foreign corporation in
        all jurisdictions where the nature of its properties or business
        requires it.

                 (b)      Authority.  Seller has the corporate power and
        authority to enter into and perform the Agreement and to consummate the
        transactions contemplated hereby.  The execution, delivery and
        performance by Seller of the Agreement and the consummation of the
        transactions contemplated hereby have been duly authorized by all
        requisite corporate action and the Agreement has been duly executed and
        delivered by Seller.

                 (c)      Validity of Agreement.  The Agreement is a legal,
        valid and binding obligation of Seller enforceable against Seller in
        accordance with the terms of the Agreement, except as enforcement may
        be limited by bankruptcy, insolvency or other similar Laws affecting
        the enforcement of creditors' rights in general.  The enforceability of
        Seller's obligations under the Agreement is subject to general
        principles of equity (regardless of whether such enforceability is
        considered in a proceeding in equity or at law).





                                       13
<PAGE>   22
                 (d)      No Violation.  The execution and delivery of the
        Agreement and the performance by the Seller of the terms of the
        Agreement do not conflict with or result in a violation of the
        Corporate Documents of Seller or any agreement, instrument, order,
        writ, judgment or decree to which Seller is a party or is subject.

                 (e)      Legal Proceedings.  Except as set forth on Schedule
        3.1(e), as of the date of the Agreement, there are no pending suits,
        actions, arbitrations, mediations or proceedings as to which Seller has
        been served process or received notice before any court or Governmental
        Body which would adversely affect the Assets, or hinder, impede or
        prevent Seller from consummating the transactions contemplated by the
        Agreement.  To Seller's Knowledge, there are no pending suits, actions,
        arbitrations, mediations or proceedings as to which Seller has not been
        served process or received notice, or that are threatened before any
        court or Governmental Body which would adversely affect the Assets, or
        hinder, impede or prevent Seller from consummating the transactions
        contemplated by the Agreement.

                 (f)      Compliance with Applicable Laws.  Except as set forth
        on Schedule 3.1(f), Seller, in the operation of those Assets that
        Seller operates and, to Seller's Knowledge, the operator in the case of
        those Assets Seller does not operate, is in compliance with any
        applicable laws, orders, rules, regulations, judgments or decrees of
        any Governmental Bodies, including the common or civil law, including
        but not limited to those relating to occupational safety and health,
        consumer product safety, employee benefits, environmental laws, zoning
        laws or regulations or other applicable laws or regulations ("Laws")
        (i) the failure to comply with which singly or in the aggregate would
        have an adverse effect in excess of Thirty-Seven Thousand Five Hundred
        Dollars ($37,500) on an Asset or Assets, the affected portions of which
        are located within three miles of each other, or (ii) where a single
        failure, or any number of failures caused by the same practice would
        cause Losses to Buyer in excess of Thirty-Seven Thousand Five Hundred
        Dollars ($37,500).

                 (g)      Contracts.  Except as set forth on Schedule 3.1(g),
        the Assets are not subject to (i) any instrument or agreement
        evidencing or related to indebtedness for borrowed money, whether
        directly or indirectly; or (ii) any agreement not entered into in the
        ordinary course of business in which the amount involved is in excess
        of Twenty-Five Thousand Dollars ($25,000).  With respect to the Assets,
        (A) all Material Contracts are to Seller's Knowledge in full force and
        effect and are the valid and legally binding obligations of the parties
        thereto and are enforceable in accordance with their respective terms;
        (B) Seller is not in material breach or default with respect to any of
        its obligations pursuant to any such Material Contract; (C) all
        payments (including, without limitation, valid calls for advance
        payment under unit or operating agreements) due by Seller thereunder
        have been made by Seller; (D) to Seller's Knowledge, and except to the
        extent a breach or default is alleged in any of the actions as set
        forth in Schedule 3.1(e), no other party to any Material Contract
        relating to any Asset is in breach or default with respect to any of
        its obligations thereunder to the extent such breach or default would
        have a material adverse impact on Seller or any of the Assets; and (E)
        neither Seller nor, to Seller's Knowledge, any other party to any
        Material Contract has given notice of any action to terminate, cancel,
        rescind, or procure a judicial reformation of a Material





                                       14
<PAGE>   23
        Contract or any provision thereof.  Except as set forth on Schedule
        3.1(g), no Contracts contain any provision that prevents Buyer from
        owning, managing and operating the Assets in accordance with historical
        practices.

                 (h)      Authorizations for Expenditures.  Except as set forth
        on Schedule 3.1(h), with respect to Authorizations for Expenditure
        executed on or after January 1, 1994, (i) there are no outstanding
        calls under Authorizations for Expenditures for payments which are due
        or which Seller has committed to make which have not been made; (ii)
        there are no material operations with respect to which Seller has
        become a non-consenting party where the effect of such non-consent is
        not disclosed on Schedule H, and (iii) there are no commitments for the
        expenditure of funds for drilling or other capital projects other than
        projects with respect to which the operator is not required under the
        applicable operating agreement to seek consent.

                 (i)      Affiliate Contracts.  All of the existing Contracts
        solely between Seller and any of its Affiliates affecting or providing
        services or support to any of the Assets or operations on the Assets
        are as set forth on Schedule 3.1(i) ("Affiliate Contracts").

                 (j)      Status and Operation of Oil and Gas Assets.  Except
        as set forth in Schedule 3.1(j), (i) there are no contractual
        obligations to engage in continuous development operations in order to
        maintain any producing Lease in force; (ii) there are no provisions
        applicable to the Leases which increase the royalty percentage of the
        lessor thereunder (other than sliding scale royalties under federal
        leases); and (iii) the Leases do not have terms (other than primary
        terms) fixed by a certain number of years.

                 (k)      Equipment.  All equipment and machinery used by
        Seller to operate the Assets has been maintained in accordance with
        past practices in the field and to Seller's Knowledge all other
        equipment and machinery used by Third Persons to operate the Assets has
        been so maintained.

                 (l)      Wells.  Except to the extent set forth on Schedule
        3.1(l), to Seller's Knowledge, no well included in the Assets is
        subject to material penalties on allowables because of any
        overproduction or any other violation of applicable Laws, which would
        have a material adverse effect on any of the wells included in the
        Assets.  Since identifying the Assets for sale, Seller has not, except
        in the reasonable and fair conduct of operations, (i) increased the
        rate of production from the Properties from prior average rates, or
        (ii) depleted the Line Fill, including oil present in gunbarrels.
        Except for the wells listed in Schedule 3.1(l), there are no wells
        located on the Leases that Seller or operator is currently obligated by
        order of any Governmental Body to plug and abandon within a time
        certain.

                 (m)      Exchange of Equipment.  Since the Identification Date
        with respect to each of the Assets, (i) Seller has not exchanged any
        Other Property for property of lesser value and (ii) Seller has not
        removed any idle or other equipment or inventory from the Assets except
        as set forth in Schedule F.





                                       15
<PAGE>   24
                 (n)      Payout Balances.  The payout balances with respect to
        any of the Assets that are subject to future change on account of
        reversionary interests, non-consent penalties or similar agreements or
        arrangements set forth on Schedule 3.1(n) are correct as of the dates
        shown on such statements.

                 (o)      No Consents Required.  Except as set forth on
        Schedule 3.1(o) or consents required from Governmental Bodies as part
        of an ordinary course transfer, no preferential purchase rights,
        consents, approvals or other action by, or filing with any Person or
        Governmental Body is required in connection with the execution,
        delivery and performance by Seller of the Agreement.

                 (p)      Tax Partnerships.  Except as identified on Schedule
        3.1(p), the Assets are not subject to any tax partnership agreement or
        provisions requiring a partnership income tax return to be filed under
        Subchapter K of Chapter 1 of Subtitle A of the Code, or any similar
        state statute.

                 (q)      Prepayment.  Seller has not received any payments by
        virtue of a prepayment arrangement under any Contract (or entered into
        a prepayment arrangement) for the sale of Hydrocarbons, of a production
        payment or of any other arrangement (other than gas balancing
        arrangements), which would obligate Seller to deliver Hydrocarbons
        produced from the Assets at some future time without receiving full
        payment therefor.

                 (r)      Payments.  To Seller's Knowledge, all payments of any
        kind required to be made by Seller to Third Persons or an Affiliate of
        Seller under any Contract or otherwise with respect to the Assets have
        been properly and timely paid, except for any such payments which are
        being contested in good faith.

                 (s)      Section 29 Tax Credits.  With respect to the wells
        listed on Schedule 3.1(s):

                          (i)      All non-liquid gas from the wells has been,
                 or satisfies the requirements to be, determined in accordance
                 with Section 503 of the Natural Gas Policy Act of 1978, as
                 amended ("NGPA"), to be production from coal seams, to the
                 extent required under Section 29(c)(2)(A) of the Code.

                          (ii)     All state and federal agency applications
                 for well determination for each well under the NGPA and the
                 rules and regulations of the Federal Energy Regulatory
                 Commission (the "FERC") under such act (the "NGPA
                 Regulations") have been filed requesting a determination that
                 all of the gas produced from the well is "occluded natural gas
                 produced from coal seams" pursuant to 18 C.F.R. Section
                 274.205(c).  Each such application has been approved by the
                 indicated state and federal agency and by the FERC and has
                 been finally approved under and in accordance with Section 503
                 of the NGPA.  To Seller's Knowledge, such applications comply
                 with the requirements of the NGPA and the NGPA Regulations and
                 do not (i) contain any untrue statement of material fact or
                 (ii) omit any statement of material fact necessary to make the
                 statements





                                       16
<PAGE>   25
                 therein not misleading.  True and correct copies of such 
                 applications and certifications have been furnished to Buyer.

                          (iii)    No portion of the gas from any of the wells
                 is attributable to a property from which gas was produced from
                 a coal seam in marketable quantities before January 1, 1980,
                 within the meaning of Section 29(d)(4) of the Code.

                          (iv)     Each of the wells was drilled (within the
                 meaning of Section 29(f)(1)(A) of the Code) after December 31,
                 1979, and before January 1, 1993.

                          (v)      No grants have been provided by the United
                 States, a state or a political subdivision of a state "for use
                 in connection with [any] project" (within the meaning of
                 Section 29(b)(3)(A)(i)(I) of the Code) that includes any of
                 the wells.

                          (vi)     No proceeds of any issue of state or local
                 government obligations have been "used to provide financing
                 for [any] project" (within the meaning of Section
                 29(b)(3)(A)(i)(II) of the Code) that includes any of the
                 wells.

                          (vii)    No "subsidized energy financing" (within the
                 meaning of Section 48(a)(4)(C) of the Code) has been "provided
                 in connection with [any] project" (within the meaning of
                 Section 29(b)(3)(A)(i)(III) of the Code) that includes any of
                 the wells.

                          (viii)   No tax credits under Code Section 29 for
                 production after the Effective Date will be reduced under
                 Section 29(b)(4) for Section 38 energy credits "with respect
                 to property used in the project" prior to the Effective Date.

                          (ix)     No oil or gas produced from the wells
                 qualifies or has qualified for the enhanced oil recovery
                 credit or any other credit under Section 43 of the Code and
                 none has been claimed or taken on such oil or gas.

                 (t)      Conduct of Business.  Except as set forth on Schedule
        3.1(t), since September 1, 1994, the Assets have not been operated
        other than in accordance with standard oilfield practices consistent
        with past practices and in the ordinary course of business.

        Section 3.2       Buyer.  Buyer represents and warrants to Seller that:

                 (a)      Organization and Standing.  Buyer has been duly
        organized, validly existing in good standing under the laws of the
        State of Delaware and is in good standing as a foreign corporation in
        all jurisdictions where the nature of its properties or business
        requires it and is duly qualified to own federal, Indian and state
        leases in those states where the Assets are located; except that Buyer
        has not qualified to do business as a foreign corporation in the State
        of Illinois.





                                       17
<PAGE>   26
                 (b)      Authority.  Buyer has the corporate power and
        authority to enter into and perform the Agreement and to consummate the
        transactions contemplated hereby.  The execution, delivery and
        performance by Buyer of the Agreement and the consummation of the
        transactions contemplated hereby have been duly authorized by all
        requisite corporate action and the Agreement has been duly executed and
        delivered.

                 (c)      Validity of Agreement.  The Agreement is a legal,
        valid and binding obligation of Buyer enforceable against Buyer in
        accordance with the terms of the Agreement, except as enforcement may
        be limited by bankruptcy, insolvency or other similar Laws affecting
        the enforcement of creditors' rights in general.  The enforceability of
        Buyer's obligations under the Agreement is subject to general
        principles of equity (regardless of whether enforceability is
        considered in a proceeding in equity or at law).

                 (d)      No Violation.  The execution and delivery of the
        Agreement and the performance by Buyer of the terms of the Agreement do
        not conflict with or result in a violation of the Corporate Documents
        of Buyer or of any agreement, instrument, order, writ, judgment or
        decree to which Buyer is a party or is subject.

                 (e)      No Consents Required.  No consents, approvals or
        other action by, or filing with any Person or Governmental Body is
        required in connection with the execution, delivery and performance by
        Buyer of the Agreement.

                 (f)      Securities Representation.  Buyer is an experienced
        and knowledgeable investor and operator in the oil and gas business and
        is acquiring the Assets for Buyer's own account and not with a view to,
        or for offer of resale in connection with, a distribution thereof,
        within the meaning of the Securities Act of 1933.

        Section 3.3       Disclaimer.  THERE ARE NO WARRANTIES, REPRESENTATIONS
OR IMPLIED COVENANTS BETWEEN THE PARTIES EXCEPT THE MATTERS EXPRESSLY PROVIDED
FOR IN THE AGREEMENT AND THE EXHIBITS AND SCHEDULES ATTACHED HERETO AND THE
DOCUMENTS, CONVEYANCES AND INSTRUMENTS TO BE DELIVERED BY THE PARTIES AT AND
AFTER CLOSING.  THE PARTIES RESPECTIVELY DISCLAIM ANY OTHER WARRANTIES OR
REPRESENTATIONS INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES AND
REPRESENTATIONS IMPLIED UNDER ANY STATUTE OR LAW.


                                     PART 4

                                   COVENANTS

        Section 4.1       Seller's Covenants.  Seller covenants with Buyer as
follows:

                 (a)      Access.  Except as set forth in Parts 5 and 6 or
        except such records or data which Seller is prevented by contractual
        obligations with Third Persons from disclosing, from the date hereof to
        the Closing Date, Seller shall afford and shall cause to be afforded to
        Buyer and Buyer's representatives full and reasonable access to the





                                       18
<PAGE>   27
        Assets in the possession of Seller or to which Seller can reasonably
        arrange access during normal working hours.  Seller shall make
        reasonable arrangements at the Buyer's request to provide access to the
        Assets after hours and on holidays.

                 (b)      Affiliate Contracts.  With respect to Affiliate
        Contracts:

                          (i)      At the request of Buyer made at any time
                 within two (2) years following the Closing Date, such request
                 to be made only one time with respect to each of the contracts
                 referred to in (A) or (B) below, Seller shall cause its
                 Affiliates to (A) enter into contracts in lieu of the
                 Affiliate Contracts under the same terms as the Affiliate
                 Contracts which shall contain a provision allowing Buyer to
                 terminate the service agreements or contracts upon thirty (30)
                 days' notice, and (B) enter into service contracts to provide
                 services that have been provided by such Affiliate with
                 respect to the Assets prior to the Closing and that Buyer
                 cannot obtain from Third Persons on reasonable commercial
                 terms, such contracts to be upon terms on which such services
                 are generally available from Third Persons under competitive
                 conditions in the general area of the pertinent Assets;
                 provided, however, (1) such terms shall be commercially
                 reasonable to the Affiliate; (2) if such services are provided
                 by the Affiliate under terms regulated by Law, the terms shall
                 be no more favorable to Buyer than is allowed under the
                 applicable tariff; (3) if the Affiliate transfers any Facility
                 necessary to the performance of the Affiliate's obligations
                 under the contract, the Affiliate shall use reasonable efforts
                 to require the transferee to assume the obligations of the
                 Affiliate under the contract; and (4) if the Affiliate intends
                 to abandon such a Facility, subject to rights of Third Persons
                 existing as of the date of the Agreement, the Affiliate shall
                 offer to Buyer the opportunity to assume the ownership thereof
                 along with the obligations in connection therewith.

                          (ii)     At any time on or following the Effective
                 Date Seller shall, upon Buyer's written request, terminate any
                 crude oil sales contracts with Seller's Affiliates and sell
                 crude oil to the purchasers designated by Buyer; provided,
                 however, that if an Affiliate of Seller offers to purchase the
                 relevant crude oil on the same terms that Buyer can obtain
                 from Third Persons, the Affiliate shall be entitled to
                 continue the purchases until Closing on the same terms as
                 Buyer could obtain from Third Persons.

                          (iii)    If any of Seller's Affiliates use any Asset
                 as of the Effective Date, and the Affiliate cannot obtain a
                 similar use from a Third Person on commercially reasonable
                 terms, Buyer shall allow such Affiliate to continue to use the
                 Asset to the same extent as used as of the Effective Date on
                 commercially reasonable terms.

                 (c)      Exclusive Dealing.  From and after the date of the
        Agreement until Closing, except (i) as otherwise consented to by Buyer
        in writing, (ii) in connection with the communications required to
        comply with preferential purchase rights, or (iii) the termination of
        dealings with other parties with whom Seller had previously
        communicated regarding the purchase of the Assets; Seller shall not
        either directly or indirectly through





                                       19
<PAGE>   28
        a representative (A) provide information to any Person or
        representative of such Person, which would assist such Person in
        evaluating the prospects of purchasing the Assets, (B) initiate,
        encourage, solicit, analyze or respond to any inquiries, offers,
        proposals, bids, or other investigations by any Person to acquire all
        or any of the Assets (other than to indicate that the Assets are not
        for sale), (C) enter into or agree to enter into any transaction, the
        result of which would interfere, hinder, delay or materially change the
        effect of the transaction contemplated by the Agreement, or (D)
        negotiate with any Person with respect to any such transaction.

                 (d)      Conduct of Business.

                          (i)      Prior to Closing Seller shall:

                                   (A)     maintain and operate the Assets in
                          accordance with standard oilfield practices and the
                          practices historically employed with respect to the
                          Assets and comply in all material respects with Laws
                          and perform in all material respects the obligations
                          under the Contracts;

                                   (B)     provide Buyer, as soon as reasonably
                          practicable following receipt by Seller, with copies
                          of all proposals for drilling or other operations
                          proposed by Third Persons, and provide Buyer with
                          such proposals made by Seller at the time they are
                          sent to Third Persons; and

                                   (C)     continue the marketing of
                          Hydrocarbons from the Assets consistent with past
                          practice except as directed by Buyer pursuant to
                          Section 4.1(b).

                          (ii)     Without the consent of Buyer (which shall be
                 provided as reasonably far in advance of the deadline for
                 responses to Third Persons as will provide Seller with
                 reasonable time to respond, or shall be deemed to be denied),
                 prior to Closing Seller shall not:

                                   (A)     waive, compromise or settle any
                          right or claims in excess of Twenty-Five Thousand
                          Dollars ($25,000) for which Buyer will have liability
                          hereunder or that will result in an upward adjustment
                          to the Purchase Price pursuant to Section 2.3;

                                   (B)     incur obligations with respect to or
                          undertake any transactions relating to the Assets
                          other than transactions (1) in the normal, usual and
                          customary manner, (2) of a nature and in an amount
                          consistent with prior practice, and (3) in the
                          ordinary course of business of owning and operating
                          the Assets;

                                   (C)     enter into any new material
                          agreements or commitments with respect to the Assets;





                                       20
<PAGE>   29
                                   (D)     abandon any property which includes
                          Leases, Fee Interests, Beneficial Interest or
                          Easements and which is capable of producing
                          Hydrocarbons in paying quantities;

                                   (E)     modify in any material respect any 
                          of the Leases or Material Contracts;

                                   (F)     encumber, sell or otherwise dispose
                          of any of the Assets, other than Other Property which
                          is replaced by equivalent property or which is
                          consumed in the normal operations of Seller's
                          business;

                                   (G)     make or obligate itself to make any
                          single expenditure for Seller's interest on any well
                          in excess of Twenty-Five Thousand Dollars ($25,000)
                          other than expenditures that are permitted under
                          applicable operating agreements, or that are required
                          for safety or other emergencies or are required by
                          Governmental Bodies to be expended;

                                   (H)     accelerate the rate of production
                          from the Leases, Fee Interests and Beneficial
                          Interest other than in the ordinary course of
                          business and consistent with standard oilfield
                          practices; or

                                   (I)     diminish the Hydrocarbons used for
                          Line Fill, including the oil present in gunbarrel
                          facilities, from the quantities present at the time
                          the Assets were identified for sale or thereafter
                          other than in the ordinary course of business and
                          consistent with standard oilfield practices.

                 (e)      Section 754 Election.  For each partnership, joint
        venture or tax partnership to which any of the Assets are subject,
        Seller shall, at Buyer's election (i) assist Buyer to cause each
        partnership, joint venture or tax partnership to elect under Section
        754 of the Code to adjust the basis of its Assets with respect to the
        transfer of the partnership interest, effective for the taxable year of
        the transfer, or (ii) use its reasonable efforts to cause the relevant
        Asset to be conveyed free of such partnership, joint venture or tax
        partnership.  With respect to each such partnership, joint venture or
        tax partnership of Seller, Seller shall exercise its reasonable efforts
        in making available to Buyer all financial and tax data necessary or
        reasonably helpful to determine whether a Section 754 election would be
        advantageous to Buyer for the taxable year of the Closing.

                 (f)      Delivery of Well List.  On or before Closing Seller
        shall deliver to Buyer a list of all wells associated with each of
        Seller's "FRSID" numbers shown on Schedule H.

        Section 4.2       Covenants of Buyer.  Buyer covenants with Seller as
follows:

                 (a)      Performance Bonds, Guaranties, Etc..  With respect to
        any surety bonds, performance bonds, guarantees or financial assurances
        relating to the Assets, on which Seller or its Affiliates are
        principals or guarantors, Buyer shall cause such surety bonds,
        performance bonds, guarantees or financial assurances to be replaced or
        otherwise





                                       21
<PAGE>   30
        released within one hundred eighty (180) days after the Closing Date.
        Buyer shall reimburse Seller for any amounts paid by Seller with
        respect to such surety bonds, performance bonds, guarantees or
        financial assurances related to periods on and after the Closing Date
        until replaced by Buyer's instruments.

                 (b)      No Use of Texaco Mark.  At the Closing Buyer shall
        cease to use any trademarks, symbols or trade names containing
        "Texaco," "Tex" as a prefix or suffix, or similar words, as well as the
        Star T Design logo associated with Seller.  Notwithstanding anything to
        the contrary herein, Buyer shall have ninety (90) days from the Closing
        Date to remove, replace, cover or paint over any identifications and
        signs, provided that Seller shall perform this activity in connection
        with the Transition Agreement.

                 (c)      Assumption of Assumed Liabilities.  At the Closing,
        with effect as of the Effective Date, Buyer shall assume the Assumed
        Liabilities.

                 (d)      Security for Plugging and Abandonment.  Unless at the
        time of Closing Buyer's net worth, as reflected on its latest financial
        statement, is greater than Five Hundred Million Dollars ($500,000,000),
        Buyer shall provide security to Seller on terms satisfactory to Seller
        for the performance of obligations contained in Section 4.3(q).

                 (e)      Qualification to do Business in Illinois.  Prior to
        Closing, Buyer shall qualify to do business as a foreign corporation in
        the State of Illinois.

        Section 4.3       Covenants of Seller and Buyer.  Seller and Buyer
covenant to each other as follows:

                 (a)      Compliance with Conditions Precedent.  Each Party
        shall use its best efforts to cause the conditions precedent set forth
        in Part 9, applicable to such Party, to be fulfilled and satisfied as
        soon as practicable but in any event prior to Closing.

                 (b)      Preparation of Closing Documents.  With respect to
        Closing Documents:

                          (i)      Forms of Assignment.  Seller shall commence
                 the preparation of all forms of Assignments, Deeds, and other
                 conveyances and transfers pursuant to the Agreement along with
                 all applicable schedules and exhibits to such forms of
                 Assignments, Deeds and other conveyances and shall begin
                 delivering such draft forms to Buyer reasonably promptly so
                 that Buyer can review and agree to such documents between the
                 time of execution of the Agreement and Closing.  Seller and
                 Buyer shall jointly prepare a description of major equipment,
                 Facilities and fixtures included in the Assets, such
                 description to be appended to a bill of sale delivered by
                 Seller to Buyer at Closing.  All such documents shall be
                 completed and delivered to Buyer for final approval and
                 execution no later than twenty (20) days prior to Closing.

                          (ii)     Preliminary Settlement Statement.  No later
                 than five (5) days prior to Closing, Seller shall present a
                 proposed preliminary settlement statement showing the
                 calculation of the Closing Amount ("Preliminary Settlement





                                       22
<PAGE>   31

                 Statement").  Buyer shall advise Seller of any proposed changes
                 or objections to the Preliminary Settlement Statement no less
                 than two (2) days prior to Closing and the Parties shall
                 thereafter diligently attempt to resolve all issues in regard
                 to the Preliminary Settlement Statement on or before Closing. 
                 If such matters cannot be resolved as of the Closing Date, the
                 Closing Amount shall be the average of the Closing Amounts
                 proposed by Seller and Buyer and the matter shall be resolved
                 in connection with the Final Recap subsequent to Closing.
        
                          (iii)    Letters in Lieu.  Seller shall prepare and
                 present to Buyer for review and approval, twenty (20) days
                 prior to Closing, the form of transfer orders or letters in
                 lieu and associated exhibits thereof in a form reasonably
                 acceptable to Buyer and the applicable purchasers of
                 production ("Letters in Lieu").

                          (iv)     All Other Closing Documents.  Each Party
                 shall deliver proposed forms of all other documents to be
                 delivered at Closing pursuant to the Agreement for which such
                 Party is responsible no later than twenty (20) days prior to
                 Closing.

                 (c)      Recording.  Buyer shall be solely responsible for
        promptly recording the Assignments, Deeds, and any other documents
        related to the conveyance of the Assets, and shall promptly furnish
        Seller with the recording information.  Seller shall be responsible for
        all filings with state, Indian and federal agencies for change of
        operator, and shall promptly provide Buyer with the original approved
        copies of all such filings, or confirmation thereof.  All governmental
        office recording and filing fees shall be paid by Buyer and where paid
        by Seller, reimbursed by Buyer promptly after receipt of an invoice.

                 (d)      Press Release.  Prior to Closing and for a period of
        thirty (30) days following Closing, neither Party shall make any press
        release or other announcement in connection with the Agreement without
        first consulting with the other Party and accommodating all reasonable
        requests to the other Party regarding postponement or cancellation of
        such press release or announcement or the statements made in such press
        release or announcement.  Following such consultation and good faith
        attempt to make reasonable accommodations, either Party may make any
        announcement or press release that it believes is either required by
        applicable Law or the rules of any stock exchange, or is advisable in
        connection with such Party's obligation to provide public disclosure
        regarding its activities.  This provision shall not apply to any filing
        with any Governmental Body or stock exchange required by Law, rule or
        regulation.

                 (e)      Brokers.  The Parties represent to each other, that
        no broker, finder, financial advisor or similar person has been
        retained by a Party except as set forth in this Section 4.3(e).  Seller
        represents that Seller has retained Morgan Stanley & Co., Incorporated
        as financial advisor in connection with the transaction contemplated by
        the Agreement.  Buyer represents that Buyer has entered into
        discussions concerning a contingent arrangement with Wasserstein &
        Perella in connection with the transactions contemplated by the
        Agreement.





                                       23
<PAGE>   32
                 (f)      Certain Filings, Consents and Permits.  With respect
        to certain filings and consents, the Parties agree that:

                          (i)      Buyer and Seller shall promptly make all
                 required filings under the HSR Act;

                          (ii)     Buyer and Seller shall cooperate with one
                 another in:

                                   (A)     determining whether any filings are
                          required to be made or consents, approvals, permits
                          or authorizations are required to be obtained under
                          any other Laws of the United States; and

                                   (B)     making any such filings, furnishing
                          information required in connection therewith and
                          seeking timely to obtain any such consents, permits,
                          authorizations, approvals or waivers; and

                          (iii)    Seller shall promptly endeavor to obtain,
                 and Buyer shall reasonably cooperate in connection with such
                 endeavors, each consent set forth on Schedule 3.1(o).

                 (g)      Risk of Loss.  The risk of casualty loss relating to
        the Assets shall pass from Seller to Buyer as of the Effective Date.
        If, prior to the Effective Date, all or any material portion of an
        Asset is destroyed by fire or other casualty, is taken in condemnation
        or under the right of eminent domain or proceedings for such purposes
        are pending or threatened, Buyer shall purchase such portion of the
        Assets, notwithstanding any such destruction, taking or pending or
        threatened taking.  Seller shall pay to Buyer (as an adjustment to the
        Purchase Price) all sums paid to Seller by Third Persons by reason of
        the destruction or taking of such portion of the Assets to be assigned
        to Buyer, and shall assign, transfer and set over to Buyer all of the
        right, title and interest of Seller in and to any unpaid awards or
        other payments from Third Persons arising out of the destruction,
        taking or pending or threatened taking as to such interest.  If prior
        to the Effective Date, the applicable Assets are destroyed by fire or
        other casualty and the sums transferred to Buyer pursuant to the
        foregoing sentence do not equal the amount necessary to replace or
        restore the pertinent Assets to the condition they were in prior to
        such fire or casualty, Seller shall pay to Buyer, or the Purchase Price
        shall be reduced by the additional amount necessary to repair or
        replace all destroyed Assets or restore the Assets to their condition
        prior to the fire or casualty loss.  If the sums that Seller would be
        responsible for pursuant to the foregoing sentence exceed fifty percent
        (50%) of the Allocated Value of the pertinent Asset, Seller may elect
        to remove the Asset from the sale and reduce the Purchase Price by the
        Allocated Value of the pertinent Asset.  Seller shall not voluntarily
        compromise, settle or adjust any material amounts payable by reason of
        any material destruction, taking or pending or threatened taking as to
        any Asset without first obtaining the written consent of Buyer, which
        shall not be unreasonably withheld.

                 (h)      Post-Closing Access.  Except as otherwise expressly
        provided herein, from and after the Closing Date, Buyer and Seller
        shall reasonably cooperate and afford each other or cause to be
        afforded to their respective officers, employees, accountants and





                                       24
<PAGE>   33
        other representatives access, upon reasonable notice, during business
        hours with respect to the facility to which access has been requested,
        to review and copy the books, documents, databases or other records
        relating to the Assets not including the excluded assets (which books,
        documents, databases, records, or employees files or other information
        the Parties shall cooperate and assist one another in identifying and
        locating), interview, depose or seek testimony of employees, provide
        assistance in proceedings with employees as witnesses or advisors,
        investigate the physical premises, take photographs or videotapes,
        identify employees and contractors with knowledge of any matter which
        is the subject of a claim for which a Party has responsibility and make
        such employees available to such Party and provide reasonable office
        space to do any of the foregoing in connection with any matter
        affecting or alleged to affect the Party requesting such access.
        Access to Tax records shall be governed by Part 5.

                 (i)      Financial Audit.  Both prior to and after the
        Closing, Seller shall provide Buyer financial data for the calendar
        years 1992, 1993 and 1994, and any portion of 1995 prior to the
        Closing.  The financial data provided by Seller shall establish the
        direct lease operating costs with respect to each of the Assets and the
        gross revenues from such Assets and such other information as may be
        required by Regulation S-X of the United States Securities and Exchange
        Commission.  The cost incurred by Seller in providing the financial
        data to Buyer shall be shared equally by Buyer and Seller.

                 (j)      Preferential Purchase Rights.  With respect to
        Preferential Rights:

                          (i)      Within fifteen (15) days following the
                 execution of the Agreement, Seller shall propose to Buyer the
                 forms of notice it intends to send to all holders of
                 preferential purchase rights in the Assets.  Seller shall
                 incorporate any revisions or additions to the forms of notice
                 requested by Buyer and reasonably satisfactory to Seller in
                 order to assure full compliance with the applicable notice
                 provisions and effective waiver of the exercise of such rights
                 if no affirmative exercise is received.  Seller shall transmit
                 to the respective holders of preferential purchase rights all
                 such notices no later than thirty (30) days following the
                 execution of the Agreement.  Seller shall keep Buyer informed
                 on a current basis as receipt of responses from the holders of
                 preferential purchase rights are received or applicable
                 exercise periods expire without exercise or response from the
                 holders.  Seller shall provide Buyer with copies of all such
                 correspondence between Seller and such holders of preferential
                 purchase rights as such correspondence is received.

                          (ii)     To the extent any preferential purchase
                 rights are exercised by any Third Person entitled to exercise
                 such rights, then the Assets subject to such preferential
                 purchase rights shall not be sold to Buyer and shall be
                 excluded from the Agreement.  The Purchase Price shall be
                 adjusted by the portion of the Allocated Value representing
                 the portion of the Assets subject to such exercised
                 preferential purchase right.  In the event any Third Person
                 initially elects to exercise a particular preferential right,
                 but subsequently refuses or elects not to consummate the
                 purchase under the preferential right and such refusal occurs
                 prior to one hundred eighty (180) days following the Closing
                 Date, Buyer shall





                                       25
<PAGE>   34
                 purchase such interests covered by the preferential right for
                 its Allocated Value as of the Effective Date and the closing of
                 such transaction shall take place on a date mutually acceptable
                 to Seller and Buyer not more than thirty (30) days following
                 such failure or refusal.
        
                          (iii)    If a preferential purchase right has not
                 been waived prior to Closing, the Assets subject to such right
                 shall be included in the Assets conveyed at Closing and there
                 shall be no adjustment to the Purchase Price or account of
                 such preferential purchase right.  If the holder of the
                 preferential purchase right exercises the right subsequent to
                 Closing, Buyer shall convey the affected property to the
                 holder of the right, and shall retain the payment therefor.

                 (k)      Required Consents.  If Seller shall fail to obtain
        any consent required for the transfer of any Asset, Seller's failure
        shall be handled as follows:

                          (i)      If the holder of the right to consent
                 affirmatively refuses to consent prior to Closing, such
                 refusal shall be considered a Title Defect under Section 7.1
                 and the Title Indemnity Payment therefor shall equal the
                 Allocated Value (or portion thereof) of the affected Property
                 (or portion thereof).

                          (ii)     Except for approvals from Governmental
                 Bodies normally received subsequent to assignment, if Seller
                 believes a consent may be obtained subsequent to Closing, the
                 Property shall be held by Seller for the benefit of Buyer
                 after Closing and shall provide Buyer with the economic
                 benefits thereof until such consent is received or until
                 ninety (90) days following Closing, if later, and Buyer shall
                 pay for the property at Closing in accordance with the
                 Agreement as though the consent had been obtained.  If Seller
                 obtains the consent on or before ninety (90) days following
                 Closing, then Seller shall deliver conveyances of the property
                 to Buyer.  If the consent is not obtained or is affirmatively
                 refused on or before ninety (90) days following Closing,
                 Seller shall refund the Allocated Value of the affected
                 portion of the Property to Buyer less any net revenues
                 (revenues net of costs and Burdens) received by Buyer in
                 connection with such affected portion of the Property and
                 Seller's holding for the benefit of Buyer shall terminate.

                 (l)      Employee Matters.  Buyer shall have the right to
        solicit the field employees of Seller (and any other employees of
        Seller that Seller identifies in writing) who work directly on or in
        connection with the Assets ("Employees"), and shall have the right to
        offer employment to and hire any such Employees.  If Buyer hires any
        Employee, the terms of employment shall be at Buyer's discretion
        provided, however, that (i) Buyer shall provide such Employee the
        benefits that are provided to other employees of Buyer on the same
        terms; and (ii) Buyer shall credit such Employee with the
        time-in-service that such Employee accrued with Seller, except that no
        more than three (3) weeks vacation shall be credited to an Employee.

                 (m)      Final Recapitulation Settlement; Subsequent Audits
        and Settlements.  With respect to final recapitulation and audits;





                                       26
<PAGE>   35
                          (i)      Within one hundred eighty (180) days after
                 the Closing Date, Seller shall provide to Buyer, for Buyer's
                 review, a proposed final recapitulation settlement in the form
                 of the Preliminary Settlement Statement (the "Final Recap
                 Statement") to account for all adjustments to the Purchase
                 Price known as of such date pursuant to Sections 2.2 and 2.3
                 (the "Final Recap").  Buyer shall have the right, within one
                 hundred twenty (120) days after receipt of the Final Recap
                 Statement, to audit the Final Recap Statement.  If Buyer
                 disagrees with the Final Recap Statement, Buyer and Seller
                 shall use best efforts to reach agreement within thirty (30)
                 days following Buyer's audit of the Final Recap Statement.

                          (ii)     Should the Parties be unable to resolve any
                 disagreements, such disagreement shall, at the earliest
                 practicable date, be referred, by either or both of the
                 Parties, to Arthur Andersen & Co. (the "Accounting Firm"),
                 along with all audit reports, work papers, schedules and
                 calculations related to the matter in dispute.  Within
                 twenty-five (25) days after such submission, the Accounting
                 Firm shall issue a letter report determining the Final Recap,
                 which shall be final and binding.  Any fees and expenses
                 incurred in resolving disputes shall be borne equally by the
                 Parties.

                          (iii)    Payment of any amounts owed under the Final
                 Recap is due thirty (30) days from the date Seller and Buyer
                 agree on the Final Recap Statement, or ten (10) days from the
                 determination of the Final Recap by the Accounting Firm,
                 whichever is later.  Interest will be applied at the Agreed
                 Rate to any amounts if not paid when due.

                          (iv)     On or before two (2) years after the Closing
                 Date, each of Seller and Buyer may give notice that it intends
                 to audit the other Party's books, accounts and records
                 relating to production proceeds, capital costs, Taxes,
                 expenses and Burdens relating to this transaction and may
                 thereafter promptly conduct such audit.  Such audit shall be
                 conducted, at the auditing Party's own expense and by
                 appointment only, and shall be conducted promptly so as to
                 cause a minimum of inconvenience to the audited Party.  Based
                 on such audit, a Party may claim further adjustments to the
                 Purchase Price pursuant to Section 2.3, or payments of any
                 other monetary obligation provided in the Agreement.  The
                 Parties shall use their best efforts to reach agreement on
                 such adjustments or payments within thirty (30) days following
                 the audit giving rise to the claims.  If the Parties cannot
                 reach agreement within such time period, the matters shall be
                 handled in the same manner as disagreements regarding the
                 Final Recap as provided in Sections 4.3(m)(ii) and (iii).

                          (v)      Following the Closing, Seller and Buyer
                 shall settle the adjustments to the Purchase Price on an
                 interim basis in accordance with the Transition Agreement.
                 Following termination of the Services under the Transition
                 Agreement, (A) revenue received by either Party that belongs
                 to the other Party shall be remitted to the other Party at
                 least monthly, and (B) invoices received by a Party that are
                 the obligation of the other Party shall be forwarded to the
                 other Party within ten (10) days of receipt of the invoice.





                                       27
<PAGE>   36
                 (n)      Further Assurances.  Each Party shall, from time to
        time at the request of the other, and without further consideration,
        execute and deliver such other instruments of sale, transfer,
        conveyance, assignment, clarification and termination and take such
        other action as the Party making the request may require to effectuate
        the intentions of the Parties, including those required to sell,
        transfer, convey and assign to, and vest in Buyer, and to place Buyer
        in possession of the Assets and to transfer, assign or convey the
        excluded assets to Seller.  Seller intends to convey the Assets at
        Closing; however, in the event it is determined after Closing that: (i)
        any part of the Assets was not in fact conveyed to Buyer, and that the
        title to any part of the Assets is incorrectly in the name of Seller;
        (ii) any excluded asset is conveyed to Buyer and that the title to such
        excluded asset is incorrectly in the name of Buyer; then each Party
        shall take all such action necessary to correctly convey any part of
        Assets to Buyer, or any part of the excluded assets to Seller.

                 (o)      Files Transfer.  Seller shall deliver the originals
        of all the files and records described in item (g) set forth in the
        definition of Other Property except where such original files also
        relate to a property retained by Seller, in which case Seller shall
        deliver copies of such files and shall provide Buyer with access to the
        original files as reasonably requested by Buyer (but Buyer shall always
        receive the originals of well logs for the wells completed or attempted
        to be completed within depths included within the Assets).  In the
        event Seller has delivered originals of files to Buyer, Seller shall
        have the right to make copies of all originals.  If Seller abandons or
        transfers its retained property prior to seven (7) years following
        Closing it shall provide Buyer a reasonable opportunity to receive any
        retained original files.  Seller shall use its reasonable efforts to
        transfer relevant well files in Seller's inactive storage as soon as
        practicable following Closing, but Seller shall not be liable if it
        fails to identify such files after exercising its reasonable efforts,
        or if such files are inadvertently destroyed prior to such transfer.
        The handling of such files and records subsequent to Closing is
        addressed in the Transition Agreement.  Seller and Buyer shall be
        equally responsible for the cost of copying these materials.  Buyer
        shall designate the method of shipment and the carrier far enough in
        advance to allow for timely shipment and will be solely responsible for
        the cost and expense of shipment and for any losses occurring as a
        result of such shipment.  BUYER SHALL ACCEPT ALL INTERPRETIVE DATA
        WITHOUT ANY WARRANTY OR REPRESENTATION REGARDING ACCURACY OR
        CORRECTNESS THEREOF.  Notwithstanding the provisions of item (g) of the
        definition of Other Property regarding legal files and files subject to
        attorney-client privilege, if such documents are pertinent to Assumed
        Liabilities or future obligations on the Assets, Seller will waive
        privilege and provide such documents unless it reasonably believes such
        waiver is likely to cause material adverse consequences to Seller.
        Seller shall also use its reasonable efforts to obtain waivers of any
        Third Person restrictions on the transfer of any files or information.

                 (p)      Gas Balancing.

                          (i)      Within ninety (90) days following the
                 Closing for Properties operated by Seller, and as soon as
                 possible after the receipt of statements from the operators of
                 Properties not operated by Seller, Seller shall provide to
                 Buyer detailed gas balancing statements on a
                 Property-by-Property basis (other than for Properties excluded
                 from the Assets or conveyed on account of the exercise of





                                       28
<PAGE>   37
                 preferential purchase rights), in accordance with COPAS for all
                 owners as to Seller-operated Properties (other than properties
                 owned solely by Seller) and in accordance with generally
                 accepted accounting procedures for Seller's interest as
                 prepared by the operator as to all other Properties, showing in
                 each case the gas balances in such Properties as of the
                 Effective Date.  Buyer shall have until two (2) years following
                 Closing to audit and reconcile gas balances with respect to
                 such Properties and object to gas balances whether or not shown
                 on the statements provided by Seller.  Promptly following
                 agreement by Seller and Buyer of the net gas imbalance as of
                 the Effective Date, Seller shall pay to Buyer if there is a net
                 overproduction balance, or Buyer shall pay to Seller if there
                 is a net underproduction balance, $1.00 per Mcf of the
                 imbalance.  The payment shall be made only with respect to the
                 net volume of the imbalance after deduction of volumes
                 attributable to unpaid Burdens.  If there is a dispute as to
                 the volume of imbalance, the foregoing adjustment payment shall
                 be made as promptly as possible to the undisputed imbalance
                 volume, and the remainder of the adjustment payment shall be
                 made upon settlement of the dispute.  Either Party may commence
                 dispute resolution in accordance with Section 10.14 when it
                 reasonably appears a dispute exists with regard to the matters
                 covered by this Section 4.3(p).
        
                          (ii)     Notwithstanding the payment adjustment to be
                 made pursuant to Section 4.3(p)(i), Seller shall have the
                 obligation to pay any cash gas balancing settlements to Third
                 Persons, attributable to periods on or before the Effective
                 Date which (A) arise by virtue of the transactions
                 contemplated by the Agreement, (B) are related to Properties
                 included within the Assets that had permanently ceased
                 production prior to the Effective Date, or (C) are required
                 pursuant to any other cash gas balancing obligation due as of
                 the Effective Date.  To the extent Seller pays any such cash
                 gas balancing amounts, Seller's gas balance as of the
                 Effective Date shall be adjusted for all volumes for which
                 cash payments are made.

                 (q)      Plugging and Abandonment.  Seller shall retain
        liability for Plugging and Abandonment obligations for specified wells
        included within the Assets with respect to which, as of the Effective
        Date, an order has been issued by the Governmental Body having
        jurisdiction requiring the well to be Plugged and Abandoned within a
        time certain.  Seller shall perform such Plugging and Abandonment
        operations upon the request of Buyer or shall reimburse Buyer for all
        reasonable costs of Plugging and Abandonment if Buyer or the operator
        plugs and abandons such wells.  Seller shall retain liability for
        properly replugging any wells located on the Assets where the well was
        improperly Plugged and Abandoned on or before the Effective Date under
        Laws in effect at the time of such Plugging and Abandonment, and Seller
        shall perform such replugging at the request of Buyer, or shall
        reimburse Buyer for all costs of replugging and abandonment if Buyer or
        the operator replugs such well.  Upon Closing, Buyer shall assume all
        of Seller's other Plugging and Abandonment obligations associated with
        the Assets as of the Effective Date and shall conduct such Plugging and
        Abandonment operations in compliance with applicable Laws and in a good
        and workmanlike manner.





                                       29
<PAGE>   38
                 (r)      Joint Use Facilities.  Facilities, whether Included
        Facilities or Excluded Facilities, that have been used both in
        connection with the Assets and properties retained by Seller (a "Joint
        Use Facility") shall, subject to rights of Third Persons existing as of
        the date of the Agreement, be made subject to joint use agreements
        appropriate for the different Joint Use Facilities to be entered into
        between Seller and Buyer providing for the sharing of such Joint Use
        Facilities in accordance with the following general terms:

                          (i)      direct expenses shall be allocated in
                 accordance with usage;

                          (ii)     usage shall be apportioned in accordance
                 with historical use for servicing the respective Assets or
                 retained properties of Seller;

                          (iii)    if the owner of a Joint Use Facility intends
                 to expand or replace such Facility, it shall offer the other
                 Party hereto the right to participate in such expansion or
                 replacement on a direct cost-sharing basis and on the basis of
                 the same percentages that the original Joint Use Facility was
                 shared;

                          (iv)     if the owner of a Joint Use Facility intends
                 to abandon the Joint Use Facility, it shall first give the
                 other Party the opportunity to assume the ownership thereof
                 along with the obligations in connection therewith; and

                          (v)      if the owner of a Joint Use Facility intends
                 to sell such Joint Use Facility, the transferor shall cause
                 the transferee to be made subject to the applicable joint use
                 agreement.

        Notwithstanding the foregoing, Facilities shall not be shared if such
        sharing cannot be accomplished on reasonable commercial terms.

                 (s)      Easements.  If any Easements are used as of the date
        of the Agreement for operations of Seller or its Affiliates, Seller
        shall convey co-tenancy in such Easements, if possible, or shall convey
        such other license or co-use rights as will ensure Buyer's use of such
        Easements in the same manner after the date of the Agreement as it was
        used by Seller prior to the date of the Agreement.


                                     PART 5

                                     TAXES

        Section 5.1       Payment and Apportionment of Real Property Taxes and
Personal Property Taxes.  With respect to Taxes:

                 (a)      Real and Personal Property Taxes Other than in
        Wyoming, Colorado and Montana.  Except with respect to Wyoming,
        Colorado and Montana, all ad valorem taxes, real property taxes and
        personal property taxes ("Real and Personal Property Taxes") for the
        year in which the Effective Date occurs shall be apportioned as of the
        Effective Date between Seller and Buyer.  Seller shall be liable for
        the portion of such Real and Personal





                                       30
<PAGE>   39
        Property Taxes based upon the number of days in the year occurring
        prior to the Effective Date, and Buyer shall be liable for the portion
        of such taxes based upon the number of days in the year occurring on
        and after the Effective Date.  For any year in which an apportionment
        is required, Buyer shall file all required reports and returns incident
        to these taxes and shall remit to the appropriate taxing authorities
        all such taxes assessed for the year in which the Effective Date
        occurs.  Seller shall pay to Buyer, at the time of Buyer's remittance,
        Seller's share of such taxes.

                 (b)      Real and Personal Property Taxes in Wyoming, Colorado
        and Montana (and the Montana Local Government Severance Tax).  All ad
        valorem taxes, real property taxes and personal property taxes in
        Wyoming, Colorado and Montana (and the local government severance tax
        in Montana) that are based on or measured by production ("WCM Real and
        Personal Property Taxes") for the year in which the Effective Date
        occurs shall be apportioned as of the Effective Date between Seller and
        Buyer.  As to all such WCM Real and Personal Property Taxes, Seller
        shall file all required reports and returns and be responsible for all
        taxes based on or measured by production occurring prior to the
        Effective Date and Buyer shall file all required reports and returns
        and be responsible for all taxes based on or measured by production
        occurring on and after the Effective Date.  For all such taxes, other
        than taxes based on or measured by oil and gas production, Seller shall
        be liable for the portion of such taxes based upon the number of days
        in the year occurring prior to the Effective Date, and Buyer shall be
        liable for the portion of such taxes based upon the number of days in
        the year occurring on and after the Effective Date.  For any year in
        which an apportionment is required, Buyer shall file all required
        reports and returns incident to these taxes and shall remit to the
        appropriate taxing authorities all taxes for the year in which the
        Effective Date occurs.  Seller shall pay to Buyer, at the time of
        Buyer's remittance, Seller's share of such taxes.

                 (c)      Liability and Right to Pursue Claims.  Seller shall
        retain liability for all adjustments, examinations or claims relating
        to Taxes that are paid by Seller and that are allocated to Seller
        pursuant to this Section 5.1.  Seller shall administer and defend any
        examination, claim or adjustments arising in connection with Taxes to
        be paid by Buyer but which are allocated to Seller pursuant to this
        Section 5.1.

        Section 5.2       Other Taxes.  All excise, windfall profit and other
Taxes relating to production of Hydrocarbons attributable to the Assets prior
to the Effective Date shall be allocated to Seller, and all such Taxes relating
to production on or after the Effective Date shall be apportioned to Buyer.
Buyer shall file any reports or returns not filed as of the Closing, and shall
remit to the proper taxing authorities any such Taxes allocated to Seller, but
not paid as of the Closing.  Seller shall pay Seller's share of such Taxes at
the time Buyer remits such Taxes.

        Section 5.3       Sales Taxes.  The Purchase Price does not include any
sales Taxes or other transfer Taxes imposed in connection with the sale of the
Assets.  Buyer shall pay any sales Tax or other transfer Tax, as well as any
applicable conveyance, transfer and recording fee, and real estate transfer
stamps or taxes imposed on the transfer of the Assets pursuant to the
Agreement.  If Buyer is of the opinion that it is exempt from the payment of
any such sales Tax or other transfer Tax, Buyer shall furnish to Seller the
appropriate tax exemption certificate.





                                       31
<PAGE>   40
        Section 5.4       Tax Proceedings.  In the event Buyer or any of
Buyer's Affiliates receives notice of any examination, claim, adjustment or
other proceeding relating to the liability for Taxes of or with respect to
Seller for any period Seller is or may be liable under Section 5.1(c), Buyer
shall notify Seller in writing within twenty (20) days of receiving notice
thereof.  As to any such Taxes for which Seller is or may be liable under
Section 5.1(c), Seller shall at Seller's expense control or settle the contest
of such examination, claim, adjustment or other proceeding, and shall indemnify
Buyer against all Losses in connection therewith.  The Parties shall cooperate
with each other and with their respective Affiliates in the negotiations and
settlement of any proceeding described in this Section 5.4.  Buyer shall
provide, or cause to be provided, to Seller necessary authorizations, including
powers of attorney, to control any proceeding which Seller is entitled to
control pursuant to Part 5.

        Section 5.5       Purchase Price Allocation.  The allocation of
Purchase Price provided for in Section 2.4 is intended to comply with the
allocation method required by Section 1060 of the Code.  Buyer and Seller shall
cooperate to comply with all substantive and procedural requirements of Section
1060 and regulations thereunder, including without limitation the filing by
Buyer and Seller of an IRS Form 8594 with their federal income tax returns for
the taxable year in which the Closing occurs.  Buyer and Seller agree that each
will not take for income tax purposes, or permit any Affiliate to take, any
position inconsistent with the allocation of Purchase Price prescribed in
Section 2.4.  Further, Buyer's reasonable allocation of the Purchase Price
between real and personal property shall determine the allocation of such
matters.


                                     PART 6

                             ENVIRONMENTAL MATTERS

        Section 6.1       Definitions.  For the purposes of the Agreement, the
following terms defined in Section 6.1 have the meanings herein assigned to
them:

        "Environmental Claims" means actions, claims, or proceedings by Third
        Persons associated with the Property Interests and based on
        Environmental Conditions or Environmental Law in connection with any
        chemical substance on or originating from a Property Interest prior to
        the Effective Date, except for the portion of any such claim associated
        with Remediation.

        "Environmental Condition" means a condition that exists prior to the
        Effective Date, and only to the extent in existence on the Effective
        Date, with respect to the air, land, soil, surface, subsurface strata,
        surface water, ground water, or sediments which causes a Property
        Interest to be subject to remediation under, or not in compliance with
        Environmental Law or a lease or agreement excluding Plugging and
        Abandonment.

        "Environmental Law" means any Law relating to pollution, the protection
        of the environment, or the release or disposal of waste materials, but
        shall not include any Law associated with Plugging and Abandonment.

        "Environmental Matter" means an Environmental Condition or an
        Environmental Claim.





                                       32
<PAGE>   41
        "Expenses" means the actual amounts expended under a Remediation Plan
        to remedy an Environmental Condition, and amounts expended to determine
        the extent of the Environmental Condition and to determine the
        appropriate means of remediation, but not Buyer's investigation
        expenses (including costs of surveys, audits or analyses) prior to
        Buyer notifying Seller of the potential Environmental Condition under
        Section 6.7.

        "Independent Environmental Review" means the assessment performed by
        Pilko & Associates, Inc., on behalf of Seller.

        "Individual Threshold" means a threshold of Thirty Seven Thousand Five
        Hundred Dollars ($37,500), with respect to Environmental Claims or
        Expenses for events or conditions located within three miles of each
        other, or associated with a single incident, single source or that are
        subject to Remediation pursuant to a single Remediation Plan.

        "Property Interest" means any single Lease, Fee Interest, Beneficial
        Interest, or Easement, or any of the foregoing interests that are
        attributable to a single Property.

        "Remediation" means actions taken to correct an Environmental Condition
        and implement the terms of a Remediation Plan.

        "Remediation Plan" means the written plan, and any amendments thereof,
        that sets forth the actions to be taken to effect any necessary
        remediation of a single Environmental Condition or a group of related
        and reasonably proximate Environmental Conditions, formulated pursuant
        to Section 6.7, and necessary to bring a Property Interest or Property
        Interests into compliance with Environmental Law, or a lease or
        agreement and, if appropriate, approved by any applicable Governmental
        Body.

        "Retained Environmental Liabilities" means appropriate actions in order
        to remediate or manage the Environmental Conditions as set forth in
        Schedule 6.1 and Environmental Matters associated with or arising from
        the Property Interests set forth on Schedule 6.1.

        "Transaction Deductible" means a deductible amount of Eight Million
        Dollars ($8,000,000) against which shall be credited (i) all costs
        expended after the Effective Date by Buyer associated with remediating
        Environmental Conditions, and amounts expended to determine the extent
        of the Environmental Condition and to determine the appropriate means
        of remediation, but not Buyer's investigation expenses (including
        expenses for surveys, audits or analyses) prior to Buyer notifying
        Seller under Section 6.7 (a) that a potential Environmental Condition
        may exist and (ii) all Losses incurred by Buyer after the Effective
        Date in connection with Environmental Claims associated with
        Environmental Conditions.

        Section 6.2       Seller.  Seller represents and warrants to Buyer that:

                 (a)      Disclosure.  Seller has no Knowledge of any facts or
        circumstances that are likely to result in Losses to Seller or Buyer
        under the Agreement for any single Environmental Matter in excess of
        Five Million Dollars ($5,000,000), other than the Retained
        Environmental Liabilities.





                                       33
<PAGE>   42
                 (b)      Past Use of Property Interest.  Except as set forth
        in Schedule 6.2 or in the Independent Environmental Review, to the
        Seller's Knowledge, at no time have the Property Interests been used by
        Seller or others as a landfill or for waste disposal, other than such
        activities associated with normal oil field operations.

        Section 6.3       Buyer.  Buyer represents and warrants to Seller that:

                 (a)      Independent Environmental Review.  Seller has
        delivered to Buyer copy of the final report of the Independent
        Environmental Review and Buyer acknowledges receipt of such report.

                 (b)      Use of Reports.  Buyer shall not reveal the
        Independent Environmental Review reports or any portion thereof to any
        of its Affiliates or Third Persons, including prospective purchasers of
        the Property Interests, except with the consent of Pilko & Associates,
        Inc. or as required by Law.

        Section 6.4       Due Diligence Procedure; Notice, Pre-Closing Date
Remediation and Removal of Properties.  Prior to the Closing Date, Buyer may,
subject to necessary Third Person operator approval, fully inspect and become
familiar with the condition of the Property Interests at reasonable times and
at its sole risk, cost and expense, and Buyer shall engage such contractors or
consultants as Buyer deems prudent for tests and surveys of the Property
Interests; provided, however, Buyer shall be responsible for any of Seller's
Losses resulting from Buyer's inspection of the Property Interests other than
Losses arising from Seller's willful, wanton or reckless conduct or gross
negligence.  In the event Buyer gives written notice to Seller of an
Environmental Condition prior to the Closing Date, Seller shall have the right
at its sole cost and risk, with the consent of Buyer which shall not be
unreasonably denied and in accordance with the covenant of cooperation set
forth in Section 6.7, to take any action which is required by Law to be taken
prior to Closing or which Seller deems appropriate in order to remediate or
otherwise manage the Environmental Condition prior to the Closing Date.  Upon
the agreement of the Parties, such Property Interest may be removed from the
Assets.  In the event that the estimated cost of Remediation of a Property
Interest exceeds fifty percent (50%) of the Allocated Value of such Property
Interest, either Seller or Buyer may elect to remove the Property Interest from
the Assets by notifying the other Party in writing prior to the Closing Date
and the Purchase Price shall be reduced by the Allocated Value of the Property
Interest.

        Section 6.5       Seller's Responsibilities.  With respect to Seller's
responsibilities:

                 (a)      Seller's Indemnity.  Except as set forth in Section
        6.5(b), Seller shall indemnify, defend, and hold Buyer harmless from
        any and all:

                          (i)      Expenses;

                          (ii)     Losses associated with Environmental Claims;

                          (iii)    any breach of representation, warranty,
                 covenant, or agreement of Seller in Part 6; and





                                       34
<PAGE>   43
                          (iv)     Expenses or Losses associated with Retained 
                 Environmental Liabilities.

                 (b)      Limitations.  With regard to Section 6.5(a):

                          (i)      Seller shall not be liable for any Expenses
                 or Losses under Section 6.5(a)(i) or (ii) unless the
                 Individual Threshold with respect to such Expenses or Losses
                 is satisfied.

                          (ii)     Seller shall be liable for Expenses or
                 Losses under Section 6.5(a)(i) or (ii) in excess of the
                 Transaction Deductible, and only if Buyer has provided Seller
                 with all information reasonably requested by Seller evidencing
                 satisfaction of the Transaction Deductible.

                          (iii)    Seller shall not be liable for any Expenses
                 or Losses under Section 6.5(a)(i), (ii) or (iv) in excess of
                 Eighty Million Dollars ($80,000,000) in the aggregate.

                          (iv)     Seller shall be responsible only for
                 Expenses under Section 6.5(a)(i) and (ii) with respect to
                 which Buyer gives Seller written notice pursuant to Section
                 6.7(a) prior to (A) one (1) year from the Effective Date with
                 respect to the Major Properties, (B) two (2) years from the
                 Effective Date with respect to all other Property Interests;
                 provided, however, in the event Buyer sells, assigns, farms
                 out, or otherwise transfers a Property Interest to a Third
                 Person after the Effective Date, Seller's obligations with
                 respect to Expenses under Section 6.5(a)(i) or (ii) shall
                 terminate with respect to such Property Interest except,
                 subject to Section 10.4, with respect to Expenses which Buyer
                 has previously given notice pursuant to this Section
                 6.5(b)(iv).

                          (v)      Seller shall be responsible only for Losses
                 associated with Environmental Claims under Section 6.5(a)(ii)
                 with respect to which Buyer gives Seller written notice
                 pursuant to Section 6.7(a) prior to six (6) years from the
                 Effective Date, provided, however, in the event Buyer sells,
                 assigns, farms out, or otherwise transfers a Property Interest
                 to a Third Person two (2) years or more after the Effective
                 Date, Seller's obligations with respect to Losses under
                 Section 6.5(a)(ii) shall terminate with respect to such
                 Property Interest except, subject to Section 10.4, (A) with
                 respect to such Losses as to which Buyer has previously given
                 notice pursuant to this Section 6.5(b)(v), and (B) as to
                 Environmental Claims arising on account of events occurring
                 solely prior to the Effective Date which were not contributed
                 to or adversely affected by Buyer or its transferee subsequent
                 to the Effective Date.

                          (vi)     Seller's responsibility shall be limited to
                 Expenses and Losses arising in connection with Environmental
                 Law or leases or agreements that are in effect (and only to
                 the extent in effect) before the Effective Date.





                                       35
<PAGE>   44
                 (c)      Oil and Gas Purposes.  Seller's obligations and the
        terms and conditions of Section 6.5 shall terminate with respect to a
        Property Interest if the Property Interest is used after the Effective
        Date for any purpose other than either activities associated with oil
        and gas drilling, production, processing, transportation or storage, or
        its use as of the Effective Date.

        Section 6.6       Buyer's Responsibilities.  Buyer shall indemnify,
defend, and hold Seller harmless (a) from any and all Expenses or Losses
resulting from Environmental Matters arising with respect to the Property
Interests before, on, or after the Effective Date, except to the extent that
Seller has agreed to indemnify Buyer under Section 6.5, and except Losses
associated with (i) releases or contamination located solely on property other
than a Property Interest, (ii) disposal (as used or defined in any
Environmental Law) prior to the Effective Date of materials from the Property
Interests to or on a location other than the Property Interests, and (iii)
Losses associated with Seller's criminal violations or willful misconduct; (b)
for any breach of representation, warranty, covenant, or agreement of Buyer in
Part 6; and (c) from all Expenses or Losses with respect to which Seller has
made payment pursuant to Section 6.10.

        Section 6.7       Covenant of Cooperation.  Buyer and Seller covenant
with each other that the Parties shall cooperate fully with each other and act
in good faith in implementing Part 6.  Buyer and Seller agree that the
performance required by the covenant set forth in the preceding sentence shall
include, but not be limited to the following:

                 (a)      providing the other Party with timely written notice
        of any potential Environmental Matter that a Party believes is covered
        under Part 6 and with respect to which the other Party may have
        liability hereunder, about which the Party has notice;

                 (b)      sharing with the other Party in a timely manner all
        material non-privileged correspondence received from any Affiliate or
        Third Person that is relevant to such potential Environmental Matter;

                 (c)      affording the other Party timely access to and an
        opportunity to comment on (both draft and final versions) any material
        non-privileged correspondence to Affiliates or Third Persons, study
        protocols and results, drawings, charts, Remediation Plans or reports,
        or other documentation relating to such Environmental Matter;

                 (d)      providing the other Party timely notice of and an
        opportunity to attend and participate in any meetings or hearings with
        Governmental Bodies or courts relating to any Environmental Matter that
        a Party believes is covered under Part 6 and with respect to which the
        other Party may have liability hereunder;

                 (e)      preparing all material strategies and plans affecting
        any matter with respect to which the other Party may have liability
        hereunder or that may affect the future operations of the other Party
        in consultation with the other Party using appropriate cost-effective
        technology and clean-up criteria, including risk-based clean-up
        standards where permitted, in accordance with applicable Laws;





                                       36
<PAGE>   45
                 (f)      selecting a Remediation Plan that is appropriately
        designed to achieve its purpose and that reasonably balances
        operational benefits and costs and performing any work under Part 6 in
        a workmanlike and cost-effective manner and in compliance with all
        applicable Laws;

                 (g)      selecting contractors and consultants affecting any
        matter with respect to which the other Party may have liability
        hereunder or that may affect the future operations of the other Party
        in consultation with, and with the consent of the other Party, which
        consent shall not be unreasonably withheld;

                 (h)      permitting the other Party to inspect and test all
        equipment, monitoring devices, transportation vehicles and facilities
        used or to be used or samples taken, to observe activities, related to
        any work under Part 6 with respect to which the other Party may have
        liability hereunder;

                 (i)      permitting each other post-Closing access, as
        described in Section 4.3(h);

                 (j)      cooperating with each other to assist in the
        collection of any amounts that may be collectible from joint interest
        owners to offset Buyer's and Seller's liabilities pursuant to Part 6;

                 (k)      Buyer shall provide to Seller semi-annual reports
        commencing six (6) months after the Closing Date and continuing for so
        long as such activities of Buyer could affect the obligations of Seller
        hereunder (but not longer than six (6) years following the Closing
        Date) describing any expense that Buyer may claim as a credit to the
        Transaction Deductible, such report to describe the affected Property
        Interest, the Environmental Matter involved, the Remediation Plan or
        other activity regarding such matter, and the expenditures to the date
        of the report that constitute a proposed credit to the Transaction
        Deductible;

                 (l)      Buyer shall provide Seller timely notice of any
        single Remediation that Buyer may claim as a credit to the Transaction
        Deductible and that is likely to cost Five Hundred Thousand Dollars
        ($500,000) or more.  Buyer shall consult with Seller regarding the
        method of such Remediation and other decisions materially affecting the
        cost and effect of the Remediation, and shall provide Seller with
        notice of major developments with respect to such Remediation as they
        occur in addition to the information provided in the semi-annual
        report; and

                 (m)      Buyer shall maintain files and records concerning any
        Remediation with respect to which Buyer requests reimbursement under
        the Agreement, and Seller shall maintain files and records concerning
        any Remediation that Seller supervises and performs under Section 6.8.
        Section 4.3(h) shall apply with respect to such files and records.

        Section 6.8       Selection and Performance of Remedies.  Buyer and
Seller agree that:

                 (a)      Seller, at Seller's sole option, to be exercised
        within sixty (60) days following the relevant notice by Buyer under
        Section 6.7(a) as to the matters requiring





                                       37
<PAGE>   46
        notice, and at any time with respect to the Retained Environmental
        Liabilities, may elect to supervise and perform any Remediation for
        which Seller is responsible as set forth in Section 6.5.  If Seller
        elects to supervise and perform such Remediation, Seller shall select
        the means and methods of effecting such Remediation in accordance with
        applicable Environmental Law, or lease or agreement (excluding Plugging
        and Abandonment) and Section 6.7; and Seller shall defend and indemnify
        Buyer from all Losses arising as a consequence of Seller's or its
        agents' actions in connection with such Remediation supervised or
        performed by Seller.  If Seller does not elect to perform such
        Remediation, Buyer shall perform such Remediation for which Seller has
        liability hereunder in accordance with a Remediation Plan that conforms
        with applicable Environmental Law or lease or agreement (excluding
        Plugging or Abandonment) and Section 6.7, and Buyer shall seek
        reimbursement from Seller as set forth in Section 6.9.

                 (b)      Seller's responsibilities for Remediation under
        Section 6.5 shall be limited to a standard appropriate for use of a
        Property Interest for oil or gas activities, to a higher standard with
        respect to a Property Interest if as of the Effective Date it is being
        used for a different purpose that requires the higher standard, or to
        any higher standard required by lease or agreement.

                 (c)      Seller's responsibilities under Section 6.5(a)(i)
        shall include only Expenses actually expended and shall not include
        costs associated with any interruption of Buyer's business, oversight
        of work performed by Seller, or costs of legal counsel employed by
        Buyer other than costs reasonably associated with accomplishing the
        Remediation or verifying its accomplishment.

                 (d)      After the Effective Date, with the prior written
        consent of Buyer (which consent shall not be unreasonably withheld)
        and, where required, the prior written consent of any operator of any
        affected Property Interests, Seller and Seller's agents and
        representatives shall have the right to enter onto the Property
        Interests during normal business hours for the purpose of conducting
        any environmental inspection, audit, test, Remediation, or any other
        purpose deemed necessary by Seller for purposes of fulfilling its
        responsibilities under Part 6.  Buyer shall use its reasonable efforts
        to obtain for Seller any consent required from any Third Person
        operator to obtain such access.

        Section 6.9       Procedure for Claiming Reimbursement; Defense of
Claims.  In the event that Buyer believes that it should receive reimbursement
from Seller pursuant to Part 6 for Remediation, Buyer shall comply with the
Environmental Processing and Reimbursement Protocol set forth in Schedule 6.9.
Buyer and Seller agree to follow the process for evaluation and approval or
denial and appeal of reimbursement claims set forth in the Environmental
Processing and Reimbursement Protocol.

        Section 6.10      Liquidation Option.  Upon the mutual agreement of the
Parties with respect to a particular Environmental Matter, Seller may pay an
agreed upon amount of money to Buyer as final settlement of Seller's
obligations under Section 6.5(a) with respect to such Environmental Matter.





                                       38
<PAGE>   47
        Section 6.11      Exclusive Remedies.  The rights and remedies granted
each Party in Part 6 are exclusive rights and remedies against the other Party
related to any defined Environmental Condition, or to any defined Environmental
Claims asserted in writing or commenced after the Closing.  Additionally, the
procedures of Section 8.2, 8.3 and 8.4 apply to the assertion and resolution of
rights and obligations under this Part 6 except with respect to reimbursement
for Remediation, which is addressed in Section 6.9.


                                     PART 7

                                 TITLE MATTERS

        Section 7.1       Definitions for Title Matters.  Except as otherwise
expressly provided in the Agreement or unless the context otherwise requires,
the following terms have the meanings assigned below:

        "Burdens" means royalties (including both lessors' royalties and
        nonparticipating royalty interests), overriding royalties, net profits
        interests, reversionary interests, production payments, and other
        similar obligations and burdens payable out of production.

        "Deducible of Record" means deducible (a) in the case of fee leases,
        from review of the records of the applicable county or parish, (b) in
        the case of federal leases, from review of the records of the
        applicable office of the Bureau of Land Management or Minerals
        Management Service, (c) in the case of Indian leases, from review of
        the records of the Bureau of Indian Affairs or the applicable tribal
        records, (d) in the case of state leases, from review of the records of
        the applicable state land office or the records of the applicable
        county or parish, or (e) in the case of state-mandated pooling orders,
        in the office of the applicable Governmental Body.

        "Defensible Title" means title to the Leases, Fee Interests, and
        Beneficial Interest, vested in Seller which (a) is, in the case of
        Lease and Fee Interests, Deducible of Record, and in the case of the
        Beneficial Interest, is either deducible from the Material Contracts or
        is Deducible of Record, (b) is free and clear of defects or
        Encumbrances (except Permitted Encumbrances), (c) entitles Seller to
        receive the proceeds attributable to a Property not less than the Net
        Revenue Interest for such Property as set forth on Schedule H, without
        suspense or indemnity not ordinarily contained in division orders, (d)
        does not obligate Seller to bear a greater Working Interest for a
        Property than the Working Interest set forth on Schedule H, unless such
        increased Working Interest share is accompanied by a corresponding
        increase in the Net Revenue Interest for the affected Property over the
        Net Revenue Interest shown on Schedule H, and (e) is not subject to
        reduction or reversion except as expressly set forth on Schedule H.

        "Encumbrance" means any lien, security interest, mortgage, deed of
        trust, pledge, charge or burden in, to or on the Assets.

        "Interest Addition" means any interest in the Leases, Fee Interests,
        and Beneficial Interest that entitles Seller to receive more than the
        Net Revenue Interest set forth on Schedule





                                       39
<PAGE>   48
        H for a particular Property or obligates Seller to bear a Working
        Interest for a particular Property less than the Working Interest set
        forth on Schedule H, provided that the reduction in royalty payable on
        federal Leases due to obtaining a stripper well exemption or on account
        of sliding scale royalties shall not be considered an Interest
        Addition.

        "Net Revenue Interest" means Seller's share of production from or
        revenue for Hydrocarbons produced from or allocated to a particular
        Property net of Burdens.

        "Permitted Encumbrances" means the following, provided that such
        Permitted Encumbrances do not operate to reduce the Net Revenue
        Interest or increase the Working Interest set forth on Schedule H,
        except as specifically disclosed in the Agreement:

                 (a)      Burdens;

                 (b)      Contracts;

                 (c)      rights of reassignment which arise prior to
        abandonment, surrender, expiration or release of oil, gas or mineral
        leases;

                 (d)      rights to consent by, required notices to, filings
        with, or other actions by any Governmental Body in connection with the
        sale or conveyance of the Assets or the assumption of operatorship, if
        the same are customarily obtained subsequent to such sale or
        conveyance;

                 (e)      easements, rights-of-way, servitudes, permits,
        surface leases, other rights relative to surface operations (including
        pipeline operations, grazing, logging, canals, ditches, reservoirs) and
        similar rights and conditions, covenants or other restrictions on or
        over the surface of the Leases, Beneficial Interest or Fee Interests
        that do not interfere materially with the current operation, value or
        use of the affected Asset and that do not affect production from the
        affected Asset;

                 (f)      easements for streets, alleys, highways, pipelines,
        telephone lines, power lines, railways and other easements and
        rights-of-way, on, over or in respect to the Leases, Beneficial
        Interest or Fee Interests that do not interfere materially with the
        current operation, value or use of the affected Asset and that do not
        affect production from the affected Asset;

                 (g)      all leases, subleases, operating agreements
        (including the non-consent provisions of applicable operating
        agreements and the elections thereunder if the effect of election has
        been specifically set forth in Schedule H and the payout status thereof
        disclosed on Schedule 3.1(n)), unit, communitization and pooling
        agreements, farmout and farmin agreements (including reversionary
        interests arising under farmout and farmin agreements if the effect
        thereof has been specifically disclosed in Schedule H and the payout
        status thereof disclosed on Schedule 3.1(n)), and Other Contracts which
        do not have a material adverse effect on the operation, value or use of
        any of the Assets;





                                       40
<PAGE>   49
                 (h)      all applicable Laws of any Governmental Body, and all
        rights reserved to or vested in any Governmental Body to control or
        regulate the Assets in any manner, including, without limitation, any
        adjustment in the Net Revenue Interest or Working Interest of a
        particular Property caused by any action of a Governmental Body and
        with respect to such action, Seller has not received written notice
        thereof as of the Effective Date or such action is not the result of
        any negligent act or omission of Seller;

                 (i)      liens for Taxes or assessments not yet due or not yet
        delinquent, or if delinquent, that are being contested in good faith by
        appropriate action brought in the normal course;

                 (j)      liens imposed by law (such as carriers',
        warehousemen's and mechanics' liens) and other similar liens, operator
        liens and working interest owner liens, arising in the ordinary course
        of business incidental to construction, maintenance or operation of the
        Assets (i) if they have not been filed pursuant to Law and the time for
        filing them has expired, (ii) if filed, they have not yet become due
        and payable or payment is being withheld as provided by Law, or (iii)
        if their validity is being contested in good faith by appropriate
        proceedings;

                 (k)      defects that have been cured by possession under
        applicable statutes of limitation;

                 (l)      changes in the Net Revenue Interest or Working
        Interest shown on Schedule H resulting from non-consent elections under
        unit, operating or similar agreements made by Buyer or Third Persons
        after the Effective Date or authorized by Buyer in writing prior to the
        Effective Date;

                 (m)      other minor defects or irregularities in title
        generally waived by prudent purchasers of oil and gas properties; and

                 (n)      as set forth on Schedule 7.1.

        "Title Defect" means anything which causes Seller's title to the
        Leases, Fee Interests or Beneficial Interest to be less than Defensible
        Title including, without limitation, (i) Seller's inability to receive
        a required consent to assign as provided in Section 4.3(k); (ii)
        Seller's inability to obtain a waiver of maintenance of uniform
        interest provision; or (iii) any fact or circumstance that would cause
        a Lease not to be in full force and effect; but excluding any matter
        caused by, through or under Buyer on or after the Effective Date.

        "Working Interest" means that share of costs and expenses associated
        with the exploration, maintenance, development and operation of a
        Property that Seller is required to bear and pay.

        Section 7.2       Title Defect Notice.  On or before January 1, 1997,
Buyer shall have, from time to time and without limitation, the right to
furnish Seller with written notices of alleged Title Defects ("Title Defect
Notice(s)"), stating with reasonable specificity the Property





                                       41
<PAGE>   50
affected, the particular Title Defect claimed, and Buyer's good faith estimate
of the amount the Title Defect reduces the Allocated Value of the affected
Property ("Defect Value").  After January 1, 1997, Buyer shall conclusively be
deemed to have waived any Title Defects not asserted by a Title Defect Notice.
For all Title Defects asserted in Title Defect Notices, Seller shall have the
option of (a) curing the Title Defect, (b) contesting the Title Defect or
Buyer's good faith estimate of the Defect Value, or (c) paying Buyer's good
faith estimate of the Defect Value, subject to the conditions of Section 7.5
("Title Indemnity Payment").

        Section 7.3       Seller's Right to Cure.  If Seller elects to cure a
Title Defect, then Seller shall so notify Buyer in writing within thirty (30)
days after receipt of the particular Title Defect Notice ("Cure Notice").
Within sixty (60) days after receipt of the Title Defect Notice, Seller shall
either cure the Title Defect to the reasonable satisfaction of Buyer ("Cure")
or if Seller is unable to Cure such Title Defect, make a Title Indemnity
Payment for such Title Defect equal to Buyer's good faith estimate of the
Defect Value set forth in the Title Defect Notice.  If any Title Defects are
Cured or if Buyer waives any Title Defect, Seller shall have no further
liability to Buyer for Purchase Price adjustments with respect thereto.

        Section 7.4       Contested Title Defects.  If Seller contests the
existence of a Title Defect or Buyer's good faith estimate of the Defect Value,
then Seller shall so notify Buyer in writing within thirty (30) days after
Seller's receipt of the Title Defect Notice ("Rejection Notice").  The
Rejection Notice shall state with reasonable specificity the basis of Seller's
rejection of the Title Defect or Buyer's good faith estimate of the Defect
Value.  Within thirty (30) days of Buyer's receipt of the Rejection Notice,
representatives of Buyer and Seller, knowledgeable in title matters, shall meet
and, within sixty (60) days after Buyer's receipt of such Rejection Notice,
either (i) agree to mutually reject the particular Title Defect in which case
Buyer shall waive the Title Defect, or (ii) agree on the validity of such Title
Defect and the Defect Value, in which case Seller shall have sixty (60) days
after the date of such agreement within which to Cure such Title Defect and
failing such Cure, to make the Title Indemnity Payment therefor.  If the
Parties cannot agree on either options (i) or (ii) in the preceding sentence,
the Title Defect or the Defect Value subject to the Rejection Notice shall be
submitted to arbitration in accordance with the procedures set forth in Section
10.14.  If Seller fails to timely deliver a Rejection Notice or a Cure Notice,
Seller shall be deemed to have accepted the validity of the Title Defect and
Buyer's good faith estimate of the Defect Value, and shall pay Buyer a Title
Indemnity Payment for the Title Defect equal to the Defect Value within sixty
(60) days of Seller's receipt of the applicable Title Defect Notice.

        Section 7.5       Title Indemnity Payments.  Title Indemnity Payments
shall be made by Seller to Buyer as an adjustment to the Purchase Price at
Closing if then determined, or if not determined as of the Closing, thereafter,
consistent with the time frames set forth in Sections 7.3 and 7.4.  The amount
of the Title Indemnity Payment for a particular Defect shall be paid regardless
of the amount of the Defect Value if the Defect Value is liquidated or certain
in amount (such as the amount necessary to release a lien, or a proportional
change to the Allocated Value of a Property resulting from a change in the Net
Revenue Interest of the Property), otherwise Seller is obligated to make a
Title Indemnity Payment only if the aggregate Defect Value of all Title Defects
with respect to a Property exceed a threshold (not a deductible) of Ten
Thousand Dollars ($10,000).  If a Defect Value is not liquidated or certain in
amount, the Defect Value shall be the amount necessary to compensate Buyer for
the adverse economic effect on





                                       42
<PAGE>   51
the Property, taking into account all relevant factors, including without
limitation, the Property's Allocated Value, the time value of money, the
practical and legal effect of the Title Defect, and the amount of reduction in
Net Revenue Interest and/or increase in the Working Interest of the affected
Property.  The aggregated Defect Value on any Property shall never exceed the
Allocated Value of such Property.

        Section 7.6       Interest Additions.  If Seller discovers an Interest
Addition to which Seller has Defensible Title, then Seller shall, from time to
time and without limitation, have the right to give Buyer written notice of
such interest additions ("Interest Addition Notice"), as soon as practicable
but on or before January 1, 1997, stating with reasonable specificity the
Property affected, the particular Interest Addition claimed, and Seller's good
faith estimate of the amount the Interest Addition increases the Allocated
Value of the affected Property ("Interest Addition Value").  After January 1,
1997, Seller shall conclusively be deemed to have waived any Interest Additions
not asserted by an Interest Addition Notice.  If Buyer agrees with the
existence of an Interest Addition and Seller's good faith estimate of the
Interest Addition Value, then the Interest Addition Value shall be applied as
an offset to any Title Indemnity Payment required of Seller ("Offset").  If
Buyer contests the existence of an Interest Addition or Seller's good faith
estimate of the Interest Addition Value, then Buyer shall so notify Seller in
writing within thirty (30) days after Buyer's receipt of the Interest Addition
Notice ("Interest Addition Rejection Notice").  The Interest Addition Rejection
Notice shall state with reasonable specificity the basis of Buyer's rejection
of the Interest Addition or Buyer's good faith estimate of the Interest
Addition Value.  Within thirty (30) days of Seller's receipt of the Interest
Addition Rejection Notice, representatives of Buyer and Seller, knowledgeable
in title matters, shall meet and, within sixty (60) days after Seller's receipt
of such Interest Addition Rejection Notice, either (a) agree to mutually reject
the particular Interest Addition in which case Seller shall waive the Interest
Addition, or (b) agree on validity of such Interest Addition and the Interest
Addition Value, in which case Seller shall be entitled to an Offset.  If the
Parties cannot agree on either options (a) or (b) in the preceding sentence,
the Interest Addition subject to the Interest Addition Rejection Notice shall
be submitted to arbitration in accordance with the procedures set forth in
Section 10.14.  If Buyer fails to timely deliver an Interest Addition Rejection
Notice, Buyer shall be deemed to have accepted the validity of the Interest
Addition and Seller's good faith estimate of the Interest Addition Value, and
Seller shall be entitled to an Offset.  Buyer shall have no obligation
whatsoever to notify Seller of any Interest Additions.

        Section 7.7       Reconveyance.  If Seller makes a Title Indemnity
Payment for one hundred percent (100%) of the Allocated Value allocable to a
Property or portion thereof, Buyer shall, at Seller's sole option to be
exercised no later than sixty (60) days after such payment, reconvey to Seller
the Property or portion of the Property with respect to which the Title
Indemnity Payment is made (effective as of the Effective Date).





                                       43
<PAGE>   52
                                     PART 8

                                   INDEMNITY

        Section 8.1       General Indemnification.

                 (a)      Seller.  Except with respect to Taxes (which are
        covered by Part 5), Title matters (which are covered by Part 7) and
        Environmental Matters (to the extent covered by Part 6 as set forth in
        Section 6.11) Seller shall indemnify, defend and hold harmless Buyer
        from and against all Losses based upon, arising out of, in connection
        with, or relating to:

                          (i)      any breach of any representation, warranty,
                 covenant or agreement of Seller contained in the Agreement;

                          (ii)     any matter arising in connection with the
                 ownership or operation of or production of Hydrocarbons from
                 the Assets prior to the Effective Date;

                          (iii)    all actions, proceedings, claims,
                 litigation, arbitration, mediation or other dispute resolution
                 procedure pending as of the Effective Date relating to or
                 affecting the Assets; and

                          (iv)     any dispute or claim arising prior to or at
                 the Closing in connection with preferential purchase rights on
                 the Assets.

                 (b)      Buyer.  Except with respect to Taxes (which are
        covered in Part 5), and Environmental Matters (to the extent covered by
        Part 6 as set forth in Section 6.11), Buyer shall indemnify, defend and
        hold harmless Seller from and against all Losses based upon, arising
        out of, in connection with, or relating to:

                          (i)      any breach of any representation, warranty,
                 covenant or agreement of Buyer contained in the Agreement;

                          (ii)     if the Closing occurs, any matter arising in
                 connection with the ownership or operation of or production of
                 Hydrocarbons from the Assets from and after the Effective
                 Date;

                          (iii)    Buyer's inspection of the Assets as set
                 forth in Sections 4.1(a) and 6.4;

                          (iv)     if the Closing occurs, any dispute or claim
                 arising after Closing in connection with preferential purchase
                 rights on Assets conveyed to Buyer at the Closing;

                          (v)      any claims asserted by Third Persons against
                 Seller in reliance on any interpretive data conveyed by Seller
                 to Buyer, to the extent such claims arise as a consequence of
                 Buyer's disclosure of such data; and





                                       44
<PAGE>   53
                          (vi)     the Assumed Liabilities.

        Section 8.2       Method of Asserting Claims, Etc.  Except for claims
under Part 6 for reimbursement for Remediation and under Part 5 or Part 7, all
claims for indemnification under the Agreement shall be asserted and resolved
as follows provided that the provisions of Sections 8.2 through 8.4 shall be
covenants and not conditions to the defense and indemnity obligations to which
they apply:

                 (a)      Third Person Claims.  In the event that any claim for
        which a Party providing indemnification (the "Indemnifying Party")
        would be liable to a Party or any of its officers, directors,
        employees, agents or representatives entitled to indemnification
        hereunder (the "Indemnified Party") is asserted against or sought to be
        collected by a Third Person, the Indemnified Party shall promptly
        notify the Indemnifying Party of such claim, specifying the nature of
        such claim and the amount or the estimated amount thereof to the extent
        then feasible (which estimate shall not be conclusive of the final
        amount of such claim) (the "Claim Notice").  The Indemnifying Party
        shall have thirty (30) days from its receipt of the Claim Notice (the
        "Notice Period") to notify the Indemnified Party (i) whether or not it
        disputes its liability to the Indemnified Party hereunder with respect
        to such claim, and (ii) if it does not dispute such liability, whether
        or not it desires, at its sole cost and expense, to defend the
        Indemnified Party against such claim; provided, however, that the
        Indemnified Party is hereby authorized prior to and during the Notice
        Period to file any motion, answer or other pleading, submission or
        document which it shall deem necessary or appropriate to protect its
        interests.  In the event that the Indemnifying Party notifies the
        Indemnified Party within the Notice Period that it does not dispute
        such liability and desires to defend against such claim or demand,
        then, except as hereinafter provided, the Indemnifying Party shall have
        the right to defend such claim or demand by appropriate proceedings,
        which proceedings shall be promptly settled or prosecuted to a final
        conclusion, in such a manner as to avoid any risk of the Indemnified
        Party becoming subject to liability.  If the Indemnified Party desires
        to participate in, but not control, any such defense or settlement, it
        may do so at its own cost and expense.  If the Indemnifying Party
        disputes its liability with respect to such claim, or elects not to
        defend against such claim, whether by not giving timely notice as
        provided above or otherwise, the Indemnified Party shall have the right
        but not the obligation to defend against such claim, and the amount of
        any such claim, or if the same be contested by the Indemnifying Party
        or by the Indemnified Party, then that portion thereof as to which such
        defense is unsuccessful, shall be conclusively deemed to be a liability
        of the Indemnifying Party hereunder (subject, if it has timely disputed
        liability, to a determination in accordance with Section 8.4 that the
        disputed liability is covered by this Part 8.)

                 (b)      Other Claims.  In the event that the Indemnified
        Party shall have a claim against the Indemnifying Party hereunder which
        does not involve a claim or demand being asserted against or sought to
        be collected from it by a Third Person, the Indemnified Party shall
        promptly send a Claim Notice with respect to such claim to the
        Indemnifying Party.  If the Indemnifying Party does not notify the
        Indemnified Party within the Notice Period that it disputes such claim,
        the amount of such claim shall be conclusively deemed a liability of
        the Indemnifying Party hereunder.





                                       45
<PAGE>   54
        Section 8.3       Payment.  Payments under Part 6 in regard to Third
Person claims, under this Part 8 and under any other indemnity provision of the
Agreement other than Parts 5 or 7 shall be made as follows:

                 (a)      Payment of Undisputed Amount.  In the event that the
        Indemnifying Party is required to make any payment under Part 6 or this
        Part 8, the Indemnifying Party shall promptly pay the Indemnified Party
        the amount so determined.  If there should be a dispute as to the
        amount or manner of determination of any indemnity obligation owed
        under Part 6 or this Part 8, the Indemnifying Party shall nevertheless
        pay when due such portion, if any, of the obligation as shall not be
        subject to dispute.  The difference, if any, between the amount of the
        obligation ultimately determined as properly payable under Part 6 or
        this Part 8 and the portion, if any theretofore paid, shall bear
        interest at the Agreed Rate as provided in Section 8.3(b).  Upon the
        payment in full of any claim, the Indemnifying Party shall be
        subrogated to the rights of the Indemnified Party against any Person or
        other entity with respect to the subject matter of such claim.

                 (b)      Interest.  If all or part of any indemnification
        obligation under the Agreement is not paid when due upon resolution of
        the claim, then the Indemnifying Party shall pay on demand to the
        Indemnified Party interest at the Agreed Rate on the unpaid amount of
        the obligation for each day from the date the amount became due until
        payment in full.

        Section 8.4       Disputed Claims.  If the Indemnifying Party shall
notify the Indemnified Party during the Notice Period that it disputes any
claim under Section 8.2 (the "Disputed Claim"), the Disputed Claim shall be
subject to the dispute resolution procedures pursuant to Section 10.14.

        Section 8.5       Applicability of Part 8.  This Part 8 does not apply
to Title matters (which are governed by Part 7) or Tax matters (which are
covered by Part 5).  This Part 8 applies to certain Environmental Matters in
the manner expressly provided in Parts 6 and 8.


                                     PART 9

                              CONDITIONS PRECEDENT

        Section 9.1       Conditions Precedent of Buyer.  The obligations of
Buyer to consummate the transactions contemplated by the Agreement are subject
to the following conditions:

                 (a)      Representations and Warranties True at Closing.  The
        representations and warranties of Seller contained in the Agreement or
        in any certificate or document delivered pursuant to the provisions
        hereof, or in connection with the transactions contemplated hereby,
        were true and complete when made, and shall be true and complete on and
        as of the Closing Date as though such representations and warranties
        were made at and as of such date except as otherwise expressly provided
        herein.





                                       46
<PAGE>   55
                 (b)      Compliance with Agreement.  On and as of the Closing
        Date, Seller shall have performed and complied with all agreements,
        covenants, and conditions required by the Agreement to be performed and
        complied with prior to or on the Closing Date.

                 (c)      Certified Resolutions and Officers' Certificate.
        Seller shall have delivered to Buyer (i) a certificate dated the
        Closing Date signed by the Secretary or an Assistant Secretary of
        Seller with respect to the action of Seller's Board of Directors
        authorizing the transactions contemplated by the Agreement, and (ii) a
        certificate, dated the Closing Date and signed by the President or a
        Vice President of Seller certifying in such detail as Buyer may
        reasonably request to the fulfillment of the conditions specified in
        subparagraphs (a) and (b) of this Section 9.1.

                 (d)      Approval of Proceedings.  All actions, proceedings,
        instruments and documents required of Seller to carry out the
        Agreement, or incidental thereto, and all other related legal matters
        shall have been approved by Zurab S. Kobiashvili, as counsel for Buyer,
        which approval shall not be unreasonably withheld.

                 (e)      Opinion of Counsel.  There shall have been delivered
        to Buyer the opinion of Larry N. Port Esq. or such other counsel
        designated by Seller as Buyer may approve, which approval shall not be
        unreasonably withheld, all dated the Closing Date as set forth on
        Exhibit E.

                 (f)      Injunction.  On the Closing Date, there shall be no
        injunction, writ, or preliminary restraining order or any order of any
        nature issued by a court or other Governmental Body of competent
        jurisdiction directing that the transaction provided for herein or any
        of them not be consummated as herein provided or imposing any
        conditions on the consummation of the transactions contemplated hereby
        and no material proceeding or lawsuit shall have been commenced or
        threatened by any Governmental Body or other Person with respect to any
        of the transactions contemplated by the Agreement.

                 (g)      Conveyance.  Seller shall execute, acknowledge and
        deliver to Buyer the Assignments and Deeds substantially in the form of
        Exhibits A-1 through A-8 and B-1 through B-3, as well as change of
        operator forms required by applicable Laws and such other documents as
        may be necessary to carry out the purpose of the Agreement.

                 (h)      Geotechnical Data Agreement.  The Geotechnical Data
        Agreement shall be entered into between Buyer and Seller substantially
        in the form as set forth on Exhibit C.

                 (i)      Transition Agreement.  The Transition Agreement shall
        be entered into between Buyer and Seller substantially in the form as
        set forth on Exhibit D.

                 (j)      Letters in Lieu.  Buyer and Seller shall execute,
        acknowledge and deliver all Letters in Lieu.

                 (k)      No Material Adverse Change.  There shall not have
        occurred with respect to any of the Major Properties any material
        adverse change in the condition or value





                                       47
<PAGE>   56
        thereof other than changes in the ordinary course of business, changes
        occurring on account of normal declines in production, changes in the
        value of such properties other than changes resulting from events or
        circumstances that affect the oil and gas industry generally.

                 (l)      HSR Act.  All necessary filings and notifications
        under the HSR Act shall have been made, including any required
        additional information or documents, and the waiting period referred to
        in such Act applicable to the transactions contemplated hereby shall
        have expired or been terminated.

        Section 9.2       Conditions Precedent of Seller.  The obligations of
Seller to consummate the transactions contemplated by the Agreement are subject
to the following conditions:

                 (a)      Representations and Warranties True at Closing.  The
        representations and warranties of Buyer contained in the Agreement or
        in any certificate or document delivered pursuant to the provisions
        hereof, or in connection with the transactions contemplated hereby,
        were true and complete when made, and shall be true and complete on and
        as of the Closing Date as though such representations and warranties
        were made at and as of such date except as otherwise expressly provided
        herein.

                 (b)      Compliance with Agreement.  On and as of the Closing
        Date, Buyer shall have performed and complied with all agreements,
        covenants, and conditions required by the Agreement to be performed and
        complied with prior to or on the Closing Date.

                 (c)      Certified Resolutions and Officers' Certificate.
        Buyer shall have delivered to Seller (i) a certificate dated the
        Closing Date signed by the Secretary or an Assistant Secretary of Buyer
        with respect to the action of Buyer's Board of Directors authorizing
        the transactions contemplated by the Agreement, and (ii) a certificate
        dated the Closing Date and signed by the President or a Vice President
        of Buyer certifying in such detail as Seller may reasonably request to
        the fulfillment of the conditions specified in subparagraphs (a) and
        (b) of this Section 9.2.

                 (d)      Approval of Proceedings.  All actions, proceedings,
        instruments and documents required for Buyer to carry out the
        Agreement, or incidental thereto, and all other related legal matters
        shall have been approved by Larry N. Port, Esq., as counsel for Seller
        or such other counsel designated by Seller which approval shall not be
        unreasonably withheld.

                 (e)      Opinion of Counsel.  There shall have been delivered
        to Seller an opinion of Zurab S.  Kobiashvili, Esq., or such other
        counsel designated by Buyer as Seller may approve, which approval shall
        not be unreasonably withheld, all dated the Closing Date as set forth
        on Exhibit F.

                 (f)      Injunction.  On the Closing Date, there shall be no
        injunction, writ, or preliminary restraining order or any order of any
        nature issued by a court or other Governmental Body of competent
        jurisdiction directing that the transactions provided for herein or any
        of them not be consummated as herein provided or imposing any
        conditions





                                       48
<PAGE>   57
        on the consummation of the transactions contemplated hereby and no
        material proceeding or lawsuit shall have been commenced or threatened
        by any Governmental Body or other Person with respect to any of the
        transactions contemplated by the Agreement.

                 (g)      Security.  Any security required by Seller of Buyer
        contemplated in Section 4.2(d) shall have been obtained.

                 (h)      Conveyance.  Buyer shall execute, acknowledge and
        deliver to Seller such documents as may be necessary to carry out the
        purposes of the Agreement.

                 (i)      Transition Agreement.  The Transition Agreement shall
        be entered into between Buyer and Seller substantially in the form of
        Exhibit D.

                 (j)      Letters in Lieu.  Buyer and Seller shall execute,
        acknowledge and deliver the Letters in Lieu.

                 (k)      HSR Act.  All necessary filings and notifications
        under the HSR Act shall have been made, including any required
        additional information or documents, and the waiting period referred to
        in such Act applicable to the transactions contemplated hereby shall
        have expired or been terminated.

                 (l)      Geotechnical Data Agreement.  The Geotechnical Data
        Agreement shall be entered into between Buyer and Seller substantially
        in the form as set forth on Exhibit C.


                                    PART 10

                                 MISCELLANEOUS

        Section 10.1      Notices.  All notices, consents, requests, demands,
and other communications hereunder shall be in writing and shall be deemed to
have been duly given or delivered if (i) delivered by hand, (ii) delivered by a
recognized overnight commercial courier (receipt requested), or (iii) sent by
telecopier (with receipt confirmed), provided that a copy is promptly
thereafter mailed in the United States by first-class postage prepaid mail, to
the Party as follows (or to such other address as any Party shall have last
designated by fifteen (15) days' notice to the other Parties).  A notice shall
also be deemed given if an original, photocopy or facsimile is actually
received by the Persons designated to receive notice, regardless of the manner
of transmission.





                                       49
<PAGE>   58
                 If to Seller:

                          Texaco Exploration and Production Inc.
                          1111 Bagby
                          Houston, Texas  77002-0200
                          Fax:     (713) 752-4612
                          Phone: (713) 752-6500
                          Attention:  President

                 If to Buyer:

                          Apache Corporation
                          2000 Post Oak Boulevard, Suite 100
                          Houston, Texas  77056-4400
                          Fax: (713) 296-6457
                          Phone: (713) 296-6000
                          Attention:  Sr. Vice President - Business Development

                          with a copy to:

                          General Counsel

        Section 10.2      Modification.  The Agreement, including this Section
10.2 and the Exhibits and Schedules, shall not be modified except by an
instrument in writing signed by the Parties.

        Section 10.3      Governing Law.  The Agreement shall be governed by
and construed and enforced in accordance with the Laws of the State of New
York, except to the extent mandatorily governed by the Laws of the state in
which the Assets are located.

        Section 10.4      Assignment.  The Agreement and the rights and
obligations created hereunder shall not be assigned prior to Closing by either
Party except that Buyer may assign its rights to a single subsidiary of Buyer
provided Buyer remains primarily liable for the performance of all obligations
hereunder.  Subsequent to Closing either Party may assign their obligations
hereunder provided the Party remains primarily liable for the performance of
the Party's obligations hereunder.  Subsequent to Closing neither Party may
assign its rights or interests under the Agreement except in connection with a
sale of all or substantially all of the Assets of the Party or in connection
with a merger or similar transaction; provided, however, that if Buyer
transfers any Asset and incurs a Loss in favor of the transferee of such Asset
for any reason, such Loss shall constitute a Loss under the Agreement.
Seller's obligations under the Agreement shall not be expanded in any manner by
a transfer of Assets by Buyer, and Buyer's rights hereunder shall not be
limited in any manner by a transfer of Assets.

        Section 10.5      Counterparts.  The Agreement may be executed in any
number of counterparts, each of which shall be deemed an original but all of
which together shall constitute one and the same instrument.





                                       50
<PAGE>   59
        Section 10.6      Invalidity.  If any of the provisions of the
Agreement including the Schedules is held invalid or unenforceable, such
invalidity or unenforceability shall not affect in any way the validity or
enforceability of any other provision of the Agreement.  In the event any
provision is held invalid or unenforceable, the Parties shall attempt to agree
on a valid or enforceable provision which shall be a reasonable substitute for
such invalid or unenforceable provision in light of the tenor of the Agreement
and, on so agreeing, shall incorporate such substitute provision in the
Agreement.

        Section 10.7      Confidentiality.  With respect to confidentiality:

                 (a)      Confidentiality Agreement.  Upon the execution of the
        Agreement, the Confidentiality Agreement shall terminate, and Sections
        10.7(b) and (c) shall govern.  Notwithstanding the Confidentiality
        Agreement or any provision hereof, Buyer may disclose to any Third
        Person and their consultants, advisors and representatives with whom
        Buyer may discuss a potential merger, takeover or other major
        transaction involving Buyer, such facts and information concerning the
        Assets and the transactions contemplated by the Agreement as may be
        material to such transaction, provided that the recipient of such facts
        and information execute an appropriate confidentiality agreement
        reasonably acceptable to Seller.

                 (b)      Seller Confidentiality.  Seller acknowledges that
        Seller and Seller's agents, advisors or representatives (collectively,
        Seller's "Representatives") possess and may hereafter obtain, in
        written form, visually (such as by inspection) or orally, certain
        business, commercial, financial, operational and environmental
        information respecting the Assets.  All such information and all
        information that may be derived therefrom is hereinafter collectively
        referred to as "Buyer Confidential Information."  Without the prior
        written consent of Buyer, Seller shall not and shall cause each of
        Seller's Representatives not to disclose Buyer Confidential Information
        to any Person or use Buyer Confidential Information, directly or
        indirectly, for any purpose, provided that, Seller and Seller's
        Representatives may use Buyer Confidential Information (i) relating to
        the Excluded Facilities or any other excluded or retained assets; (ii)
        to the extent required in order to perform and comply with the
        Agreement and the agreements and transactions contemplated hereby,
        including without limitation, the Geotechnical Data Agreement or (iii)
        with respect to Taxes, accounting and litigation associated with the
        ownership of the Assets prior to the Closing Date.  Seller shall
        transmit the Buyer Confidential Information only to those of Seller's
        Representatives who need to know the Buyer Confidential Information for
        purposes set forth in this Section 10.7(b).  Seller shall be
        responsible for any breach of this Section 10.7(b) by Seller or
        Seller's Representatives.  Seller shall make all reasonable, necessary
        and appropriate efforts to safeguard the Buyer Confidential Information
        from disclosure to anyone other than as permitted by this Section
        10.7(b).  Notwithstanding anything to the contrary contained herein,
        neither Seller nor Seller's Representatives shall be entitled to use
        any Buyer Confidential Information if the use thereof could reasonably
        be expected to result in a violation of any Laws.  This Section 10.7(b)
        shall be inoperative as to such portions of the Buyer Confidential
        Information that:  (i) are in the public domain; (ii) are published or
        otherwise become part of the public domain through no fault of Seller
        or Seller's Representatives; (iii) concern the Assets and first become
        available after the Closing to Seller or Seller's Representatives,





                                       51
<PAGE>   60
        or that concern the Buyer and became available at any time to Seller or
        Seller's Representatives, and that in either case Seller can
        demonstrate was in the possession of Seller or Seller's Representatives
        at the time of such disclosure and to the Knowledge of Seller was not
        acquired by any such Person directly or indirectly from Buyer or its
        Representatives on a confidential basis; (iv) concern the Assets and
        first become available to Seller or Seller's Representatives after the
        Closing, or that concern Buyer and become available to Seller or
        Seller's Representatives at any time, in either case on a
        non-confidential basis (whether directly or indirectly) from a source
        that to the best of any such Person's knowledge did not acquire the
        Buyer Confidential Information on a confidential basis; (v) concern the
        Assets and are independently developed by Seller or Seller's
        Representatives after the Closing, or that concern Buyer and are
        independently developed at any time by Seller or Seller's
        Representatives, in either case without access to the Buyer
        Confidential Information; or (vi) are required to be disclosed by Law,
        stock exchange rules or by any applicable judgment, order or decree of
        any court or Governmental Body having jurisdiction in the proceeding,
        or in connection with the preparation of Tax returns, communications
        with Governmental Bodies with respect thereto or proceedings relating
        to Taxes; provided that Seller, to the extent practicable, shall
        provide Buyer with prompt notice thereof so that Buyer may seek a
        protective order or other appropriate remedy or waive compliance with
        the provisions of this Section 10.7(b).  In the event that such
        protective order or other remedy is not obtained or Buyer waives
        compliance with the provisions of this Section 10.7(b), Seller shall or
        shall cause the Seller's representative required to disclose such Buyer
        Confidential Information to furnish only that portion of the Buyer
        Confidential Information that Seller or Seller's representative is
        advised by an opinion of Seller's counsel is legally required, and, to
        the extent practicable, Seller shall exercise its reasonable best
        efforts to obtain reliable assurance that confidential treatment is
        accorded the Buyer Confidential Information so furnished.

                 (c)      Buyer Confidentiality.  Buyer acknowledges that Buyer
        and Buyer's Representatives possess and may hereafter obtain, in
        written form, visually (such as by inspection) or orally, certain
        business, commercial, financial, operational and environmental
        information and information relating to the Excluded Facilities or any
        other excluded or retained assets, intellectual property respecting
        those assets retained by Seller, any rights of Seller under the
        Geotechnical Data Agreement and services provided by Seller, Seller's
        Affiliates and their respective businesses in connection with the
        Transition Agreement.  All such information and all information that
        may be derived therefrom (excluding information relating to the Assets)
        is hereinafter collectively referred to as "Seller Confidential
        Information."  Without the prior written consent of Seller, Buyer shall
        not and shall cause each of Buyer's Representatives not to disclose
        Seller Confidential Information to any Person or use Seller
        Confidential Information, directly or indirectly, for any purpose,
        provided that, Buyer and Buyer's Representatives may use Seller
        Confidential Information to the extent required in order to perform and
        comply with the Agreement and the agreements and transactions
        contemplated hereby.  Buyer shall transmit the Seller Confidential
        Information only to those of Buyer's Representatives who need to know
        the Seller Confidential Information for the purposes set forth in the
        proviso above.  Buyer shall be responsible for any breach of this
        Section 10.7(c) by Buyer and Buyer's Representatives.  Buyer shall make
        all reasonable, necessary and





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<PAGE>   61
        appropriate efforts to safeguard the Seller Confidential Information
        from disclosure to anyone other than as permitted by this Section
        10.7(c).  Notwithstanding anything to the contrary contained herein,
        neither Buyer nor Buyer's Affiliates shall be entitled to use any
        Seller Confidential Information if the use thereof could reasonably be
        expected to result in a violation of any Laws.  This Section 10.7(c)
        shall be inoperative as to such portions of the Seller Confidential
        Information that: (i) are in the public domain; (ii) are published or
        otherwise become part of the public domain through no fault of Buyer or
        Buyer's Representatives; (iii) that Buyer can demonstrate was in the
        possession of Buyer or Buyer's Representatives at the time of such
        disclosure and to the Knowledge of Buyer was not acquired by any such
        Person directly or indirectly from the Seller or its Representatives on
        a confidential basis; (iv) become available to Buyer or Buyer's
        Representatives on a non- confidential basis (whether directly or
        indirectly) from a source that to the best of any such Person's
        knowledge did not acquire the Seller Confidential Information on a
        confidential basis; (v) are independently developed by Buyer, or
        Buyer's Representatives without access to the Seller Confidential
        Information; (vi) relate to Buyer's rights under the Geotechnical Data
        Agreement; or (vii) are required to be disclosed by Law, stock exchange
        rules or by any applicable judgment, order or decree of any court or
        Governmental Body having jurisdiction in the proceeding, or in
        connection with the preparation of Tax returns, communications with
        Governmental Bodies with respect thereto or proceedings relating to
        Taxes; provided that Buyer, to the extent practicable, shall provide
        Seller with prompt notice thereof so that Seller may seek a protective
        order or other appropriate remedy or waive compliance with the
        provisions of this Section 10.7(c).  In the event that such protective
        order or other remedy is not obtained or Seller waives compliance with
        the provisions of this Section 10.7(c), Buyer shall or shall cause the
        Person required to disclose such Seller Confidential Information to
        furnish only that portion of the Seller Confidential Information that
        such Person is advised by an opinion of Buyer's counsel is legally
        required, and, to the extent practicable, Buyer shall exercise its
        reasonable best efforts to obtain reliable assurance that confidential
        treatment is accorded the Seller Confidential Information so furnished.

                 (d)      The obligations of the Parties under Section 10.7(b)
        and (c) shall terminate three (3) years after the Closing Date.

        Section 10.8      Entire Agreement and Construction.  The Agreement
contains the entire agreement between the Parties with respect to the
transactions contemplated hereby and all prior understandings and agreements
shall merge herein.  There are no additional terms, whether consistent or
inconsistent, oral or written, which are intended to be part of the Parties'
understandings which have not been incorporated into the Agreement and the
Schedules and Exhibits.  The Parties agree that they have jointly participated
in the drafting and preparation of the Agreement and the Subsidiary Agreements
and that the language of the Agreement shall be construed as a whole according
to its fair meaning and not strictly for or against any of the Parties hereto.

        Section 10.9      Expenses.  Except as otherwise expressly provided
herein, each Party shall bear its fees, costs and expenses in connection with
the transactions contemplated herein, including, without limitation, all legal
and accounting fees and disbursements and fees and expenses of other advisors
retained by such Party.





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<PAGE>   62
        Section 10.10     Waivers and Amendments.  All amendments and other
modifications hereof shall be in writing and signed by each of the Parties.
Either Party may by written instrument (i) waive any inaccuracies in any of the
representations or warranties made to it by any other Party contained in the
Agreement or in any instruments and documents delivered to it pursuant to the
Agreement, or (ii) waive compliance or performance by the other Party with or
of any of the covenants or agreements made to it by the other Party contained
in the Agreement.  The delay or failure on the part of a Party hereto to
insist, in any one instance or more, upon strict performance of any of the
terms or conditions of the Agreement, or to exercise any right or privilege
herein conferred shall not be construed as a waiver or any such terms,
conditions, rights or privileges but the same shall continue and remain in full
force and effect.  All rights and remedies are cumulative.  The waiver of a
condition to Closing by a Party regarding a warranty, representation or
covenant shall not constitute a waiver of a breach of such warranty,
representation or covenant; provided, however, that the Parties shall attempt
in good faith to agree prior to Closing upon the resolution of a breach of a
representation or warranty that arises after the date of the Agreement which
could result in liability to the breaching Party and of which the other Party
has actual Knowledge, and if the Parties cannot agree upon a resolution, the
breach shall be deemed waived if the Closing occurs.

        Section 10.11     Survival of Warranties, Representations and
Covenants.  All representations and warranties contained in the Agreement shall
survive the Closing and continue with respect to claims made on or before two
(2) years following the Closing Date.  The covenants, indemnities and
agreements contained in the Agreement shall survive the Closing and continue in
accordance with their respective terms.

        Section 10.12     Section Headings.  The section headings in the
Agreement are for convenience of reference only and shall not be deemed to
alter or affect the interpretation of any provision thereof.

        Section 10.13     Termination.

                 (a)      The Agreement may be terminated (i) by mutual written
        consent of the Parties at any time prior to the Closing; (ii) by Buyer
        by notice to Seller given on or before the Closing Date, if Buyer shall
        discover any material fact or condition existing on the date of such
        termination which is at variance with any of the representations and
        warranties of Seller contained in the Agreement; or (iii) by Seller or
        Buyer if the Closing shall not have occurred on or before March 31,
        1995, other than through the fault of the terminating Party.  Upon any
        termination the Parties shall have no further obligations under the
        Agreement; provided, however, Buyer shall hold all information which it
        has obtained during the transaction contemplated hereby, subject to the
        Confidentiality Agreement, and the provisions of Sections 10.3, 10.5,
        10.6, 10.7, 10.8, 10.9, 10.10, 10.12 and 10.13 shall remain in full
        force and effect.

                 (b)      If Seller elects to terminate the Agreement pursuant
        to Section 10.13(a)(iii) and the Closing has not occurred solely by
        reason of Buyer's failure to proceed under the terms of the Agreement
        after satisfaction of all the conditions precedent to Buyer's
        obligation to close as set forth in Section 9.1 then Seller shall
        retain the Deposit and all interest thereon.





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<PAGE>   63
                 (c)      If the Agreement is terminated for any reason other
        than the failure of Buyer to close under the circumstances set forth in
        Section 10.13(b), Seller shall return the Deposit to Buyer within three
        (3) Business Days following such termination with interest thereon at
        the Agreed Rate from the date of the Agreement until the earlier of
        March 1, 1995 or the date of return to Buyer.

        Section 10.14     Dispute Resolution.  The provisions of Schedule 10.14
(which address dispute resolution) shall apply to disputes between the Parties.

         IN WITNESS WHEREOF, the Parties hereto have entered into the Agreement
as of the date first herein above written.


                                        TEXACO EXPLORATION AND PRODUCTION INC.



                                        By: /s/ CLARENCE P. CAZALOT, JR.
                                          Clarence P. Cazalot, Jr.
                                          President


                                        APACHE CORPORATION



                                        By: /s/ JAMES R. BAUMAN
                                          James R. Bauman
                                          Senior Vice President





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