PIONEER NATURAL RESOURCES USA INC
8-K, 1998-01-12
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): January 8, 1998



                        PIONEER NATURAL RESOURCES COMPANY
                       PIONEER NATURAL RESOURCES USA, INC.
           (Exact name of registrants as specified in their charters)


        DELAWARE                       001-13245               75-2702753
        DELAWARE                        1-10193                75-2516853
(State or other jurisdiction of  (Commission File Number)    (IRS Employer
       incorporation)                                       Identification No.)

1400 WILLIAMS SQUARE WEST
5205 NORTH O'CONNOR BLVD.
       IRVING, TEXAS                                           75039
(Address of principal executive                              (Zip code)
         offices)                                                   


       Registrant's telephone number, including area code: (972) 444-9001

                                 NOT APPLICABLE
         (former name and former address, if changed since last report)




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



<PAGE>   2



ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

         (A) None

         (B) None

<TABLE>
<CAPTION>
(C)      EXHIBITS
<S>      <C>      <C>
         99.1     Underwriting Agreement, dated January 8, 1998, among Pioneer
                  Natural Resources Company, Pioneer Natural Resources USA,
                  Inc., Salomon Brothers Inc, Chase Securities Inc., J.P.Morgan
                  Securities Inc., Morgan Stanley & Co. Incorporated and
                  NationsBanc Montgomery Securities LLC (for themselves and the
                  other several Underwriters, if any, named in Schedule II
                  thereto)
</TABLE>



<PAGE>   3

                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrants have duly caused this report to be signed on their behalf by the
undersigned thereunto duly authorized.


     
                         PIONEER NATURAL RESOURCES COMPANY
                         (Registrant)



                         By:   /s/ MARK L. WITHROW
                               ----------------------------------------------
                         Name:    Mark L. Withrow
                         Title:   Executive Vice President and General Counsel





                         PIONEER NATURAL RESOURCES USA, INC.
                         (Registrant)



                         By:   /s/ MARK L. WITHROW
                               ----------------------------------------------
                         Name:    Mark L. Withrow
                         Title:   Executive Vice President and General Counsel


Date:    January 12, 1998



<PAGE>   4

                                INDEX TO EXHIBITS
<TABLE>
<CAPTION>
EXHIBIT                                                                  
NUMBER                                                                   PAGE
<S>            <C>                                                       <C>
99.1            Underwriting Agreement, dated January 8, 1998, among 
                Pioneer Natural Resources Company, Pioneer Natural 
                Resources USA, Inc., Salomon Brothers Inc, Chase 
                Securities Inc., J.P.Morgan Securities Inc., Morgan 
                Stanley & Co. Incorporated and NationsBanc Montgomery 
                Securities LLC (for themselves and the other several 
                Underwriters, if any, named in Schedule II thereto)
</TABLE>






<PAGE>   1
                                                                  EXECUTION COPY





                       PIONEER NATURAL RESOURCES COMPANY

                             UNDERWRITING AGREEMENT

                                                              New York, New York

                                                                 January 8, 1998

To the Representatives named
       in Schedule I hereto of
       the Underwriters named in
       Schedule II hereto


Dear Sirs:

                 Pioneer Natural Resources Company, a Delaware corporation (the
"Company"), proposes to sell to the several underwriters named in Schedule II
hereto (the "Underwriters"), for whom you (the "Representatives") are acting as
representatives, $350 million of its 6.50% Senior Notes Due 2008 (the "2008
Notes") and $250 million of its 7.20% Senior Notes Due 2028 (the "2028 Notes",
and, together with the 2008 Notes, the "Notes") each of which is
unconditionally guaranteed on an unsecured basis (the "Guarantees", and,
together with the Notes, the "Securities") by Pioneer Natural Resources USA,
Inc., a Delaware corporation (the "Guarantor").  The Securities will be issued
under an indenture (as amended, the "Indenture") to be dated as of January 13,
1998, between the Company and The Bank of New York, as trustee (the "Trustee"),
as supplemented with respect to the Securities by the First Supplemental
Indenture dated as of January 13, 1998, among the Company, the Guarantor and
the Trustee. To the extent there are no additional Underwriters listed on
Schedule I other than you, the term Representatives as used herein shall mean
you, as Underwriters, and the terms Representatives and Underwriters shall mean
either the singular or plural as the context requires.

                 1. Representations and Warranties. Each of the Company and the
Guarantor, jointly and severally, represents and warrants to, and agrees with,
each Underwriter as set forth below in this Section 1. Certain terms used in
this Section 1 are defined in paragraph (c) hereof.

                 (a) The Company meets the requirements for the use of Form S-3
         under the Securities Act of 1933 (the "Act") and has prepared and
         filed with the Securities and Exchange Commission (the "Commission") a
         registration statement on Form S-3 (File No. 333-42315), including a
         related basic prospectus and a preliminary prospectus supplement, for
         the registration under the Act of the offering and sale of the
         Securities. The Company has filed one amendment thereto, including a
         Preliminary Final Prospectus, each of which has previously been
         furnished to you. Such registration statement, as so amended, has
         become effective. The offering of the Securities is a Delayed Offering
         and, although the Basic Prospectus may not include all the information
         with respect to the Securities and the offering thereof required by
         the Act and the rules thereunder to be included in the Final
         Prospectus, the Basic Prospectus includes all such information
         required by the Act and the rules thereunder to be included therein as
         of the Effective Date and the Preliminary Final Prospectus includes
         all information (other than Rule 430A Information) required by the Act
         and the rules thereunder to be included in such registration statement
         and the Final Prospectus as of the Effective Date.  The Company will
         next file with the Commission pursuant to Rules 415 and 424(b) a final
         supplement to the form of prospectus included in
<PAGE>   2
                                                                               2

         such registration statement relating to the Securities and the
         offering thereof.  As filed, such final prospectus supplement shall
         include all Rule 430A Information, together with all other such
         required information with respect to the Securities and the offering
         thereof and, except to the extent the Representatives shall agree in
         writing to a modification, shall be in all substantive respects in the
         form furnished to you prior to the Execution Time or, to the extent
         not completed at the Execution Time, shall contain only such specific
         additional information and other changes (beyond that contained in the
         Basic Prospectus and any Preliminary Final Prospectus) as the Company
         has advised you, prior to the Execution Time, will be included or made
         therein. If the Registration Statement contains the undertaking
         specified in Regulation S-K Item 512(a), the Registration Statement,
         at the Execution Time, meets the requirements set forth in Rule
         415(a)(i)(x).

                 (b) On the Effective Date, the Registration Statement did or
         will, and when the Final Prospectus is first filed (if required) in
         accordance with Rule 424(b) and on the Closing Date, the Final
         Prospectus (and any supplement thereto) will, comply in all material
         respects with the applicable requirements of the Act, the Securities
         Exchange Act of 1934 (the "Exchange Act") and the Trust Indenture Act
         of 1939 (the "Trust Indenture Act") and the respective rules
         thereunder; on the Effective Date and at the Execution Time, the
         Registration Statement did not or will not contain any untrue
         statement of a material fact or omit to state any material fact
         required to be stated therein or necessary in order to make the
         statements therein not misleading; on the Effective Date and on the
         Closing Date the Indenture did or will comply in all material respects
         with the requirements of the Trust Indenture Act and the rules
         thereunder; and, on the Effective Date, the Final Prospectus, if not
         filed pursuant to Rule 424(b), did not or will not, and on the date of
         any filing pursuant to Rule 424(b) and on the Closing Date, the Final
         Prospectus (together with any supplement thereto) will not, include
         any untrue statement of a material fact or omit to state a material
         fact necessary in order to make the statements therein, in the light
         of the circumstances under which they were made, not misleading;
         provided, however, that the Company makes no representations or
         warranties as to (i) that part of the Registration Statement which
         shall constitute the Statement of Eligibility and Qualification (Form
         T-1) under the Trust Indenture Act of the Trustee or (ii) the
         information contained in or omitted from the Registration Statement or
         the Final Prospectus (or any supplement thereto) in reliance upon and
         in conformity with information furnished in writing to the Company by
         or on behalf of any Underwriter through the Representatives
         specifically for use in the Registration Statement or the Final
         Prospectus (or any supplement thereto).

                 (c) The terms which follow, when used in this Agreement, shall
         have the meanings indicated. A "Delayed Offering" shall mean an
         offering of securities pursuant to Rule 415 which does not commence
         promptly after the effective date of a registration statement, with
         the result that only information required pursuant to Rule 415 need be
         included in such registration statement at the effective date thereof
         with respect to the securities so offered. "Effective Date" shall mean
         each date that the Registration Statement, any post-effective
         amendment or amendments thereto and any Rule 462(b) Registration
         Statement became or become effective and each date after the date
         hereof on which a document incorporated by reference in the
         Registration Statement is filed.  "Execution Time" shall mean the date
         and time that this Agreement is executed and delivered by the parties
         hereto. "Basic Prospectus" shall mean the prospectus referred to
<PAGE>   3
                                                                               3

         in paragraph (a) above contained in the Registration Statement at the
         Effective Date, including any Preliminary Final Prospectus.
         "Preliminary Final Prospectus" shall mean any preliminary prospectus
         supplement to the Basic Prospectus which describes the Securities and
         the offering thereof and is used prior to filing of the Final
         Prospectus. "Final Prospectus" shall mean the prospectus supplement
         relating to the Securities that is first filed pursuant to Rule 424(b)
         after the Execution Time, together with the Basic Prospectus.
         "Registration Statement" shall mean the registration statement
         referred to in paragraph (a) above, including incorporated documents,
         exhibits and financial statements, as amended at the Execution Time
         (or, if not effective at the Execution Time, in the form in which it
         shall become effective) and, in the event any post-effective amendment
         thereto or Rule 462(b) Registration Statement becomes effective prior
         to the Closing Date (as hereinafter defined), shall also mean such
         registration statement as so amended or such Rule 462(b) Registration
         Statement, as the case may be, and shall also include all Rule 430A
         Information deemed to be a part of the Registration Statement as of
         the time it was declared effective. "Rule 415", "Rule 424", "Rule
         430A" and Rule 462 and "Regulation S-K" refer to such rules or
         regulation under the Act. "Rule 430A Information" shall mean
         information with respect to the Securities and the offering thereof
         permitted to be omitted from the Registration Statement when it
         becomes effective pursuant to Rule 430A. "Rule 462(b) Registration
         Statement" shall mean a Registration Statement and any amendments
         thereto filed pursuant to Rule 462(b) relating to the offering covered
         by the initial Registration Statement. "Salomon Smith Barney" shall
         mean Salomon Brothers Inc.  Any reference herein to the Registration
         Statement, the Basic Prospectus, any Preliminary Final Prospectus or
         the Final Prospectus shall be deemed to refer to and include the
         documents incorporated by reference therein pursuant to Item 12 of
         Form S-3 which were filed under the Exchange Act on or before the
         Effective Date of the Registration Statement or the issue date of the
         Basic Prospectus, any Preliminary Final Prospectus or the Final
         Prospectus, as the case may be; and any reference herein to the terms
         "amend", "amendment" or "supplement" with respect to the Registration
         Statement, the Basic Prospectus, any Preliminary Final Prospectus or
         the Final Prospectus shall be deemed to refer to and include the
         filing of any document under the Exchange Act after the Effective Date
         of the Registration Statement or the issue date of the Basic
         Prospectus, any Preliminary Final Prospectus or the Final Prospectus,
         as the case may be, deemed to be incorporated therein by reference.

                 (d) Each of the Material Corporate Subsidiaries (as defined
         herein) other than the Guarantor is duly qualified as a foreign
         corporation in good standing in all jurisdictions where their
         ownership or leasing of properties or the conduct of their businesses
         requires such qualification, except where the failure so to register
         or qualify does not have a material adverse effect on the condition
         (financial or other), business, prospects or results of operations of
         the Company and its Subsidiaries considered as a whole.  Pioneer
         Natural Resources USA, Inc., a Delaware corporation that was the
         predecessor by merger to the Guarantor, was duly qualified as a
         foreign corporation in good standing in all jurisdictions on December
         29, 1997, where its ownership or leasing of properties or the conduct
         of its businesses required such qualification, except where the
         failure so to register or qualify would not have had a material
         adverse effect on the condition (financial or other), business,
         prospects or results of operations of the Company and its Subsidiaries
         considered as a whole.  The Guarantor is duly qualified as a foreign
         corporation in good standing in the State of Texas and is taking all
         commercially reasonable actions necessary to become duly qualified as
         a foreign corporation in good standing as soon as practicable in all
         other jurisdictions where its ownership or leasing of properties or
         the conduct of its businesses requires such qualification, except
         where the
<PAGE>   4
                                                                               4

         failure so to register or qualify would not have a material adverse
         effect on the condition (financial or other), business, prospects or
         results of operations of the Company and its Subsidiaries considered
         as a whole.

                 2 . Purchase and Sale. Subject to the terms and conditions and
in reliance upon the representations and warranties herein set forth, the
Company agrees to sell to each Underwriter, and each Underwriter agrees,
severally and not jointly, to purchase from the Company, (a) at a purchase
price of 98.864% of the principal amount thereof, plus accrued interest, if
any, from January 13, 1998, to the Closing Date, the principal amount of 2008
Notes set forth opposite such Underwriter's name in Schedule II hereto and (b)
at a purchase price of 99.088% of the principal amount thereof, plus accrued
interest, if any, from January 13, 1998 to the Closing Date, the principal
amount of 2028 Notes set forth opposite such Underwriter's name in Schedule II
hereto.

                 3. Delivery and Payment. Delivery of and payment for the
Securities shall be made at 10:00 a.m., New York City time, on January 13, 1998
(or such later date not later than three business days after such date as the
Representatives shall designate), which date and time may be postponed by
agreement between the Representatives and the Company or as provided in Section
8 hereof (such date and time of delivery and payment for the Securities being
herein called the "Closing Date"). Delivery of the Securities shall be made to
the Representatives for the respective accounts of the several Underwriters
against payment by the several Underwriters through the Representatives of the
purchase price thereof to or upon order of the Company by wire transfer and
payable in immediately available funds to an account specified by the Company.
Delivery of the Securities shall be made through the facilities of The
Depository Trust Company unless the Representatives shall otherwise instruct.

                 4. Agreements of the Company and the Guarantor. Each of the
Company and the Guarantor agrees, jointly and severally, with the several
Underwriters that:

                 (a) Each of the Company and the Guarantor will use its best
         efforts to cause the Registration Statement, if not effective at the
         Execution Time, and any amendment thereto, to become effective. Prior
         to the termination of the offering of the Securities, neither the
         Company nor the Guarantor will file any amendment to the Registration
         Statement or supplement (including the Final Prospectus or any
         Preliminary Final Prospectus) to the Basic Prospectus or any Rule
         462(b) Registration Statement unless the Company has furnished the
         Representatives a copy for their review prior to filing and will not
         file any such proposed amendment or supplement to which the
         Representatives reasonably object. Subject to the foregoing sentence,
         the Company will cause the Final Prospectus, properly completed, and
         any supplement thereto to be filed with the Commission pursuant to the
         applicable paragraph of Rule 424(b) within the time period prescribed
         and will provide evidence satisfactory to the Representatives of such
         timely filing. The Company will promptly advise the Representatives
         (i) when the Registration Statement, if not effective at the Execution
         Time, and any amendment thereto, shall have become effective, (ii)
         when the Final Prospectus, and any supplement thereto, shall have been
         filed with the Commission pursuant to Rule 424(b) or when any Rule
         462(b) Registration Statement shall have been filed with the
         Commission, (iii) when, prior to termination of the offering of the
         Securities, any amendment to the Registration Statement shall have
         been filed or become effective, (iv) of any request by the Commission
         or its staff at any time when a prospectus relating to the Securities
         is required to be delivered under the Act for any amendment of the
         Registration Statement or any Rule 462(b) Registration Statement or
         for any supplement to the Final Prospectus
<PAGE>   5
                                                                               5

         or for any additional information, (v) of the issuance by the
         Commission at any time when a prospectus relating to the Securities is
         required to be delivered under the Act of any stop order suspending
         the effectiveness of the Registration Statement or the institution or
         threatening of any proceeding for that purpose and (vi) of the receipt
         by the Company of any notification with respect to the suspension of
         the qualification of the 2008 Notes or 2028 Notes for sale in any
         jurisdiction or the initiation or threatening of any proceeding for
         such purpose. Each of the Company and the Guarantor will use its best
         efforts to prevent the issuance of any such stop order and, if issued,
         to obtain as soon as possible the withdrawal thereof.

                 (b) If, at any time when a prospectus relating to the
         Securities is required to be delivered under the Act, any event occurs
         as a result of which the Final Prospectus as then supplemented would
         include any untrue statement of a material fact or omit to state any
         material fact necessary to make the statements therein in the light of
         the circumstances under which they were made not misleading, or if, at
         any time when a prospectus relating to the Securities is required to
         be delivered under the Act, it shall be necessary to amend the
         Registration Statement or supplement the Final Prospectus to comply
         with the Act or the Exchange Act or the respective rules thereunder,
         the Company and the Guarantor promptly will (i) notify the
         Representatives of such event, (ii) prepare and file with the
         Commission, subject to the second sentence of paragraph (a) of this
         Section 4, an amendment or supplement which will correct such
         statement or omission or effect such compliance and (iii) supply any
         supplemented Final Prospectus to the Representatives in such
         quantities as they may reasonably request.

                 (c) As soon as practicable, the Company will make generally
         available to its security holders and to the Representatives an
         earnings statement or statements of the Company and its Subsidiaries
         which will satisfy the provisions of Section 11(a) of the Act and Rule
         158 under the Act.

                 (d) The Company will furnish to the Representatives and
         counsel for the Underwriters, without charge, signed copies of the
         Registration Statement (including exhibits thereto) and to each other
         Underwriter a copy of the Registration Statement without exhibits
         thereto and, so long as delivery of a prospectus by an Underwriter or
         dealer may be required by the Act, as many copies of any Preliminary
         Final Prospectus and the Final Prospectus and any supplement thereto
         as the Representatives may reasonably request. The Company will pay
         the expenses of printing or other production of all documents relating
         to the offering.

                 (e) The Company will arrange for the qualification of the
         Securities for sale under the laws of such jurisdictions as the
         Representatives may designate, will maintain such qualifications in
         effect so long as required for the distribution of the Securities,
         will arrange for the determination of the legality of the Securities
         for purchase by institutional investors, will pay the fee of the
         National Association of Securities Dealers, Inc. (the "NASD"), in
         connection with its review, if any, of the offering and will pay any
         fees of the NASD incurred by Salomon Smith Barney in its capacity as a
         qualified independent underwriter (the "Independent Underwriter")
         pursuant to the rules of the NASD.

                 (f) Neither the Company nor the Guarantor will take, directly
         or indirectly, any action designed to or which constitutes or which
         might reasonably be expected to cause or result, under the Exchange
         Act or otherwise, in stabilization or manipulation of the price of any
         security of the Company to facilitate the sale or the resale of the
         Securities.
<PAGE>   6
                                                                               6

                 (g) Neither the Company nor the Guarantor shall offer, sell,
         contract to sell or otherwise dispose of (or enter into any
         transaction which is designed to, or might reasonably be expected to,
         result in the disposition (whether by actual disposition or effective
         economic disposition due to cash settlement or otherwise) by the
         Company or any affiliate of the Company or any person in privity with
         the Company or any affiliate of the Company) directly or indirectly,
         or announce the offering of, any debt securities issued or guaranteed
         by the Company or the Guarantor in an offering to the public (or in a
         private offering in which holders of debt securities are granted
         rights to have such debt securities registered under the Act or to
         exchange such debt securities for other debt securities that are so
         registered) from the date hereof until the first business day
         following the Closing Date, without the prior written consent of
         Salomon Smith Barney.

                 5. Conditions to the Obligations of the Underwriters. The
obligations of the Underwriters to purchase the Securities shall be subject to
the accuracy of the representations and warranties on the part of the Company
and the Guarantor contained herein as of the Execution Time and the Closing
Date, to the accuracy of the statements of the Company and the Guarantor made
in any certificates pursuant to the provisions hereof, to the performance by
each of the Company and the Guarantor of its obligations hereunder and to the
following additional conditions:

                 (a) If the Registration Statement has not become effective
         prior to the Execution Time, unless the Representatives agree in
         writing to a later time, the Registration Statement will become
         effective not later than (i) 6:00 PM New York City time, on the date
         of determination of the public offering price, if such determination
         occurred at or prior to 3:00 PM New York City time on such date or
         (ii) 9:30 AM on the Business Day following the day on which the public
         offering price was determined, if such determination occurred after
         3:00 PM New York City time on such date; if filing of the Final
         Prospectus, or any supplement thereto, is required pursuant to Rule
         424(b), the Final Prospectus, and any such supplement, will be filed
         in the manner and within the time period required by Rule 424(b); and
         no stop order suspending the effectiveness of the Registration
         Statement shall have been issued and no proceedings for that purpose
         shall have been instituted or threatened.

                 (b) There shall be furnished to the Representatives the
         opinion of Vinson & Elkins L.L.P., counsel for the Company and the
         Guarantor, dated the Closing Date and addressed to the
         Representatives, limited to the federal laws of the United States, the
         Delaware General Corporation Law and the laws of the State of Texas,
         and in form and substance satisfactory to the Representatives, to the
         effect that:

                          (i) Each of the Company and the Guarantor has been
                 duly incorporated and is validly existing as a corporation in
                 good standing under the laws of the State of Delaware and has
                 corporate power and authority to own and lease its properties
                 and to conduct its business as described in the Final
                 Prospectus as amended or supplemented;

                          (ii) The Company has an authorized capitalization as
                 described in the Final Prospectus as amended or supplemented.
                 Upon issuance, the Securities will conform in all material
                 respects to the description thereof in the Final Prospectus as
                 amended or supplemented;
<PAGE>   7
                                                                               7

                          (iii) The Indenture and the First Supplemental
                 Indenture (the "First Supplemental Indenture") to be dated as
                 of January 13, 1998, among the Company, the Guarantor and the
                 Trustee have been duly authorized, executed and delivered by
                 the Company and the Guarantor, as applicable; the Indenture
                 has been duly qualified under the Trust Indenture Act; and,
                 assuming due authorization, execution and delivery thereof by
                 each party thereto other than the Company and the Guarantor,
                 the Indenture and the First Supplemental Indenture constitute
                 legal, valid and binding obligations of the Company and the
                 Guarantor enforceable against the Company and the Guarantor in
                 accordance with their terms (subject, as to enforcement of
                 legal remedies, to applicable bankruptcy, reorganization,
                 insolvency, moratorium or other laws affecting creditors'
                 rights generally from time to time in effect and, as to
                 remedies of specific performance and injunctive and other
                 forms of equitable relief, to equitable defenses or principles
                 and to the discretion of the court before which any proceeding
                 may therefor be brought); The Notes have been duly authorized
                 and executed and, when authenticated in accordance with the
                 Indenture and delivered to and paid for by the Underwriters
                 pursuant to this Agreement, will constitute legal, valid and
                 binding obligations of the Company entitled to the benefits of
                 the Indenture and enforceable against the Company in
                 accordance with their terms (subject, as to enforcement of
                 legal remedies, to applicable bankruptcy, reorganization,
                 insolvency, moratorium or other laws affecting creditors'
                 rights generally from time to time in effect and, as to
                 remedies of specific performance and injunctive and other
                 forms of equitable relief, to equitable defenses or principles
                 and to the discretion of the court before which any proceeding
                 may therefor be brought). The Guarantees have been duly
                 authorized and executed and constitute the legal, valid and
                 binding obligations of the Guarantor, enforceable against the
                 Guarantor in accordance with its terms (subject, as to
                 enforcement of legal remedies, to applicable bankruptcy,
                 reorganization, solvency, moratorium or other laws affecting
                 creditors' rights generally from time to time in effect and,
                 as to remedies of specific performance and injunctive and
                 other forms of equitable relief, to equitable defenses or
                 principles and to the discretion of the court for which any
                 proceeding may therefor be brought);

                          (iv) To the best of such counsel's knowledge and
                 other than as set forth in the Final Prospectus, there are no
                 legal or governmental proceedings pending or threatened to
                 which the Company or any of its Subsidiaries is a party or of
                 which any property of the Company or any of its Subsidiaries
                 is the subject that would individually or in the aggregate
                 result in a material adverse change in the condition
                 (financial or otherwise), business, prospects or results of
                 operations of the Company and its Subsidiaries considered as a
                 whole ("Subsidiaries" means (A) any corporation in which the
                 Company, directly or indirectly, owns more than 50% of the
                 outstanding voting securities and (B) any limited partnership
                 in which the Company, or any Subsidiary of the Company, is the
                 general partner and the Company, directly or indirectly, owns
                 a majority of the limited partnership interests);

                          (v) This Agreement has been duly authorized, executed
                 and delivered by the Company and the Guarantor;

                          (vi) Neither the Company nor the Guarantor is and,
                 after giving effect to the offering and sale of the Securities
                 and the application of the proceeds thereof
<PAGE>   8
                                                                               8

                 as described in the Final Prospectus, neither of them will be,
                 an "investment company" or an entity "controlled" by an
                 "investment company" that is or is required to be registered
                 under the Investment Company Act of 1940;

                          (vii) The documents incorporated by reference in the
                 Final Prospectus as amended or supplemented (other than the
                 financial statements, including the notes thereto and related
                 schedules, other financial data and accounting information,
                 and engineering and reserve data contained therein, as to
                 which such counsel need express no opinion), when they became
                 effective or were filed with the Commission, as the case may
                 be, complied as to form in all material respects with the
                 requirements of the Act or the Exchange Act, as applicable,
                 and the rules and regulations of the Commission thereunder;
                 and such counsel has no reason to believe that any of such
                 documents, when they became effective or were so filed, as the
                 case may be, contained, in the case of a registration
                 statement which became effective under the Act, an untrue
                 statement of a material fact or omitted to state a material
                 fact required to be stated therein or necessary to make the
                 statements therein not misleading, or, in the case of other
                 documents which were filed under the Act or the Exchange Act
                 with the Commission, contained an untrue statement of a
                 material fact or omitted to state a material fact necessary in
                 order to make the statements therein, in the light of the
                 circumstances under which they were made when such documents
                 were so filed, not misleading; provided that such counsel need
                 express no opinion as to whether any annual, quarterly or
                 current report filed by MESA Inc. and incorporated by
                 reference in the Final Prospectus complied as to form in all
                 material respects with the requirements of the Exchange Act
                 and the rules and regulations of the Commission thereunder
                 when such report was filed with the Commission;

                          (viii) The Registration Statement has become
                 effective under the Act; any required filing of the Basic
                 Prospectus, any Preliminary Final Prospectus and the Final
                 Prospectus, and any supplements thereto, pursuant to Rule
                 424(b) has been made in the manner and within the time period
                 required by Rule 424(b); to the knowledge of such counsel, no
                 stop order suspending the effectiveness of the Registration
                 Statement has been issued, no proceedings for that purpose
                 have been instituted or threatened, and the Registration
                 Statement and the Final Prospectus as amended or supplemented,
                 and any further amendments and supplements thereto made by the
                 Company or the Guarantor prior to the Closing Date (other than
                 the financial statements, including the notes thereto and
                 related schedules, other financial data and accounting
                 information, and engineering and reserve data contained
                 therein, as to which such counsel need express no opinion),
                 comply as to form in all material respects with the
                 requirements of the Act and the rules and regulations
                 thereunder; and

                          (ix) Although such counsel has not verified, is not
                 passing on, and does not assume responsibility for the
                 accuracy, completeness, or fairness of the statements
                 contained in the Registration Statement or the Final
                 Prospectus (or any documents incorporated by reference
                 therein), except as otherwise specifically dealt with in their
                 opinion, no facts have come to the attention of such counsel
                 that have caused such counsel to believe (a) that the
                 Registration Statement, as amended prior to the Closing Date
                 (other than the financial statements, including the notes
                 thereto and related schedules, other financial data and
                 accounting information, and engineering and reserve data
                 contained therein, as to which such
<PAGE>   9
                                                                               9

                 counsel need express no opinion or belief) contained as of its
                 effective date or contains as of the Closing Date an untrue
                 statement of a material fact or omitted or omits, as the case
                 may be, to state a material fact required to be stated therein
                 or necessary to make the statements therein not misleading, or
                 (b) that the Final Prospectus, as amended or supplemented
                 prior to the Closing Date (other than the financial
                 statements, including the notes thereto and related schedules,
                 other financial data and accounting information, and
                 engineering and reserve data contained therein, as to which
                 such counsel need express no opinion or belief) contained as
                 of the date of this Agreement or contains as of the Closing
                 Date an untrue statement of a material fact or omitted or
                 omits to state a material fact necessary to make the
                 statements therein, in light of the circumstances under which
                 they were made, not misleading; and they do not know of any
                 amendment to the Registration Statement required to be filed
                 or any contracts or other documents of a character required to
                 be filed as an exhibit to the Registration Statement or
                 required to be incorporated by reference into the Final
                 Prospectus as amended or supplemented or required to be
                 described in the Registration Statement or the Final
                 Prospectus as amended or supplemented which are not filed or
                 incorporated by reference or described as required.

                 (c) The Company shall have furnished to the Representatives
         the opinion of Mark L. Withrow, Executive Vice President and General
         Counsel of the Company, dated the Closing Date, limited to the federal
         laws of the United States, the laws of the State of Texas and the
         Delaware General Corporation Law, and in form and substance
         satisfactory to the Representatives, to the effect that:

                          (i) The Company is duly qualified as a foreign
                 corporation in good standing in all jurisdictions where its
                 ownership or leasing of properties or the conduct of its
                 business requires such qualification, except where the failure
                 so to register or qualify does not have a material adverse
                 effect on the condition (financial or other), business,
                 prospects or results of operations of the Company and its
                 Subsidiaries considered as a whole (such counsel being
                 entitled to rely in respect of the opinion in this clause upon
                 opinions of local counsel and in respect of matters of fact
                 upon certificates of public officials or officers of the
                 Company, provided that such counsel shall state that he
                 believes that both you and he are justified in so relying upon
                 such opinions and certificates);

                          (ii) All of the issued shares of capital stock of the
                 Company have been duly and validly authorized and issued and
                 are fully paid and non-assessable;

                          (iii) the Guarantor, Pioneer Natural Resources (GPC)
                 Inc., Westpan NGL Co., Pioneer Natural Resources (Canada) Ltd.
                 ("Pioneer Canada"), Chauvco Resources Ltd. ("Chauvco") and
                 Parker & Parsley Gas Processing Co. (the "Material Corporate
                 Subsidiaries") have each been duly organized and are validly
                 existing as corporations in good standing under the laws of
                 their respective jurisdictions of incorporation (such counsel
                 being entitled to rely with respect to the opinion in this
                 clause relating to Pioneer Canada and Chauvco upon opinions of
                 local counsel, provided that such counsel shall state that he
                 believes that both you and he are justified in so relying upon
                 such opinions);

                          (iv) Each of the Material Corporate Subsidiaries
                 (other than the Guarantor) is duly qualified as a foreign
                 corporation in good standing in all jurisdictions
<PAGE>   10
                                                                              10

                 where their ownership or leasing of properties or the conduct
                 of their businesses requires such qualification, except where
                 the failure so to register or qualify does not have a material
                 adverse effect on the condition (financial or other),
                 business, prospects or results of operations of the Company
                 and its Subsidiaries considered as a whole (such counsel being
                 entitled to rely in respect of the opinion in this clause upon
                 opinions of local counsel and in respect of matters of fact
                 upon certificates of public officials or officers of the
                 Company or the Material Corporate Subsidiaries, provided that
                 such counsel shall state that he believes that both you and he
                 are justified in so relying upon such opinions and
                 certificates);

                          (v) All outstanding shares of capital stock of the
                 Material Corporate Subsidiaries have been duly authorized and
                 validly issued, are fully paid and non-assessable, and are
                 owned by the Company or by another subsidiary of the Company
                 free and clear of any liens, encumbrances, equities or claims,
                 except as described in the Final Prospectus (such counsel
                 being entitled to rely with respect to the opinion in this
                 clause relating to Pioneer Canada and Chauvco upon opinions of
                 local counsel, provided that such counsel shall state that he
                 believes that both you and he are justified in so relying upon
                 such opinions);

                          (vi) Pioneer Resources Producing L.P. (the "Material
                 Partnership Subsidiary") is validly existing as a limited
                 partnership under the laws of the State of Delaware, is duly
                 qualified or registered as a foreign limited partnership or
                 otherwise qualified as a limited partnership in each
                 jurisdiction in which the nature of the activities conducted
                 by it or the nature of the assets owned by it makes such
                 qualification necessary, except where the failure so to
                 register or qualify does not have a material adverse effect on
                 the condition (financial or other), business, prospects or
                 results of operations of the Company and its Subsidiaries
                 considered as a whole or on the rights or liabilities of its
                 limited partners (such counsel being entitled to rely in
                 respect of the opinion in this clause upon opinions of local
                 counsel and in respect of matters of fact upon certificates of
                 public officials or officers of the general partner of the
                 Material Partnership Subsidiary provided that such counsel
                 shall state that he believes that both you and he are
                 justified in so relying upon such opinions and certificates);

                          (vii) To the best of such counsel's knowledge and
                 other than as set forth in the Final Prospectus, there are no
                 legal or governmental proceedings pending or threatened to
                 which the Company of any of its Subsidiaries is a party or of
                 which any property of the Company or any of its Subsidiaries
                 is the subject, which would individually or in the aggregate
                 result in a material adverse change in the condition
                 (financial or otherwise), business, prospects or results of
                 operations of the Company and its Subsidiaries considered as a
                 whole;

                          (viii) Except as disclosed in the Final Prospectus as
                 amended or supplemented, and except for any breaches,
                 violations or defaults that, in the aggregate, would not
                 either affect the rights of the holders of the Securities or
                 materially adversely affect the condition (financial or
                 otherwise), business, prospects or results of operations of
                 the Company and its Subsidiaries considered as a whole (it
                 being understood that these exceptions shall not apply to any
                 violations of the Certificate of Incorporation or By-laws of
                 the Company or the Guarantor as referred to below), the issue
                 and sale of the Securities, the compliance by the Company and
                 the Guarantor with all of the provisions of this
<PAGE>   11
                                                                              11

                 Agreement with respect to the Securities and the Guarantee, as
                 applicable, and the consummation of the transactions herein
                 and therein contemplated will not conflict with or result in a
                 breach or violation of any of the terms or provisions of, or
                 constitute a default under, (i) any material indenture,
                 mortgage, deed of trust, note agreement or other agreement or
                 instrument known to such counsel to which the Company, any of
                 the Material Corporate Subsidiaries or the Material
                 Partnership Subsidiary is a party or by which the Company, any
                 of the Material Corporate Subsidiaries, the Material
                 Partnership Subsidiary or any of their respective properties
                 is bound, (ii) the Certificate of Incorporation or By- Laws of
                 the Company, (iii) the Certificate of Incorporation or By-Laws
                 of the Guarantor or (iv) any statute, order, rule or
                 regulation known to such counsel of any United States federal
                 or state court or governmental agency or body having
                 jurisdiction over the Company, any of its Material Corporate
                 Subsidiaries or the Material Partnership Subsidiary or any of
                 their respective properties;

                          (ix) No consent, approval, authorization, order,
                 registration or qualification of or with any United States
                 federal or state court or governmental agency or body is
                 required for the issuance and sale of the Securities or the
                 consummation by the Company and the Guarantor of the
                 transactions contemplated by this Agreement except such as
                 have been obtained under the Act and such consents, approvals,
                 authorizations, registrations or qualifications as may be
                 required under state securities or blue sky laws in connection
                 with the purchase and distribution of the Securities by the
                 Underwriters;

                          (x) Such counsel has no reason to believe that any of
                 the documents incorporated by reference in the Final
                 Prospectus as amended or supplemented (other than the
                 financial statements, including the notes thereto and related
                 schedules, other financial data and accounting information and
                 engineering and reserve data contained therein, as to which
                 such counsel need express no opinion or belief), when they
                 became effective or were filed with the Commission, as the
                 case may be, contained, in the case of a registration
                 statement which became effective under the Act, an untrue
                 statement of a material fact or omitted to state a material
                 fact or omitted to state a material fact required to be stated
                 therein or necessary to make the statements therein not
                 misleading, or, in the case of other documents which were
                 filed under the Act or the Exchange Act with the Commission,
                 contained an untrue statement of a material fact or omitted to
                 state a material fact necessary in order to make the
                 statements therein, in the light of the circumstances under
                 which they were made when such documents were so filed, not
                 misleading;

                          (xi) No holders of securities of the Company have
                 rights to the registration of such securities under the
                 Registration Statement; and

                          (xii) Although such counsel has not verified, is not
                 passing on, and does not assume responsibility for the
                 accuracy, completeness or fairness of the statements contained
                 in the Registration Statement or the Final Prospectus (or any
                 documents incorporated by reference therein), except as
                 otherwise specifically dealt with in his opinion, no facts
                 have come to the attention of such counsel that have caused
                 such counsel to believe (a) that the Registration Statement,
                 as amended prior to the Closing Date (other than the financial
                 statements, including the notes thereto and related schedules,
                 other financial data and accounting
<PAGE>   12
                                                                              12

                 information, and engineering and reserve data contained
                 therein, as to which such counsel need express no opinion or
                 belief) contained as of its effective date or contains as of
                 the Closing Date an untrue statement of a material fact or
                 omitted or omits, as the case may be, to state a material fact
                 required to be stated therein or necessary to make the
                 statements therein not misleading, or (b) that the Final
                 Prospectus, as amended or supplemented prior to the Closing
                 Date (other than the financial statements, including the notes
                 thereto and related schedules, other financial data and
                 accounting information, and engineering and reserve data
                 contained therein, as to which such counsel need express no
                 opinion or belief) contains as of the Closing Date an untrue
                 statement of a material fact or omitted or omits to state a
                 material fact necessary to make the statements therein, in
                 light of the circumstances under which they were made, not
                 misleading, and such counsel does not know of any amendment to
                 the Registration Statement required to be filed or any
                 contracts or other documents of a character required to be
                 filed as an exhibit to the Registration Statement or required
                 to be incorporated by reference into the Final Prospectus as
                 amended or supplemented or required to be described in the
                 Registration Statement or the Final Prospectus as amended or
                 supplemented which are not filed or incorporated by reference
                 or described as required.

                 (d) The Representatives shall have received from Cravath,
         Swaine & Moore, counsel for the Underwriters, such opinion or
         opinions, dated the Closing Date and addressed to the Representatives,
         with respect to the issuance and sale of the Securities, the
         Indenture, the Registration Statement, the Final Prospectus (together
         with any supplement thereto) and other related matters as the
         Representatives may reasonably require, and the Company shall have
         furnished to such counsel such documents as they may reasonably
         request for the purpose of enabling them to pass upon such matters.

                 (e) The Company shall have furnished to the Representatives a
         certificate of each of the Company and the Guarantor, signed by (A)
         the Chairman of the Board or the President and Chief Executive Officer
         and (B) the Executive Vice President and Chief Financial Officer, or
         any other officer of the Company or the Guarantor, as applicable,
         satisfactory to the Representatives dated the Closing Date, to the
         effect that:

                          (i) the representations and warranties of the Company
                 or the Guarantor, as applicable, in this Agreement are true
                 and correct on and as of the Closing Date with the same effect
                 as if made on the Closing Date and the Company or the
                 Guarantor, as applicable, has complied in all material
                 respects with all the agreements and satisfied in all material
                 respects all the conditions on its part to be performed or
                 satisfied at or prior to the Closing Date;

                          (ii) no stop order suspending the effectiveness of
                 the Registration Statement has been issued and no proceedings
                 for that purpose have been instituted or, to the Company's or
                 the Guarantor's knowledge, as applicable, threatened by
                 appropriate governmental authorities; and

                          (iii) since the date of the most recent financial
                 statements included in the Final Prospectus (exclusive of any
                 supplement thereto), there has been no material adverse change
                 in the condition (financial or other), business, prospects or
                 results of operations of the Company and its Subsidiaries, or
                 the Guarantor and its subsidiaries, as applicable, in each
                 case considered as a whole, whether or not
<PAGE>   13
                                                                              13

                 arising from transactions in the ordinary course of business,
                 except as set forth in or contemplated in the Final Prospectus
                 (exclusive of any supplement thereto).

                 (f) At the Execution Time and the Closing Date, each firm of
         accountants who have certified the financial statements of the Company
         and its Subsidiaries and other relevant entities, including, without
         limitation, Parker & Parsley Petroleum Company, MESA Inc. and Chauvco
         Resources Ltd. included or incorporated by reference in the
         Registration Statement or the Final Prospectus, shall have furnished
         to the Representatives a letter or letters (which may refer to letters
         previously delivered to one or more of the Representatives), to the
         effect set forth in Annex I hereto, and including such other matters
         as the Representatives may reasonably request, in form and substance
         satisfactory to the Representatives.

                 (g) Subsequent to the Execution Time or, if earlier, the dates
         as of which information is given in the Registration Statement
         (exclusive of any amendment thereof) and the Final Prospectus
         (exclusive of any supplement thereto), there shall not have been (i)
         any change or decrease specified in the letter or letters referred to
         in paragraph (f) of this Section 5 or (ii) any change, or any
         development involving a prospective change, in or affecting the
         business or properties of the Company and its Subsidiaries taken as a
         whole the effect of which, in any case referred to in clause (i) or
         (ii) above, is, in the judgment of the Representatives, so material
         and adverse as to make it impractical or inadvisable to proceed with
         the offering or delivery of the Securities as contemplated by the
         Registration Statement (exclusive of any amendment thereto) and the
         Final Prospectus (exclusive of any supplement thereto).

                 (h) Subsequent to the Execution Time (1) no downgrading shall
         have occurred in the rating accorded the Company's debt securities or
         preferred stock by any "nationally recognized statistical rating
         organization", as that term is defined by the Commission for purposes
         of Rule 438(g)(2) under the Act, and (ii) no such organization shall
         have publicly announced that it has under surveillance or review, with
         possible negative implications, its rating of any of the Company's
         debt securities or preferred stock;

                 (i) Prior to the Closing Date, the Company shall have
         furnished to the Representatives such further information,
         certificates and documents as the Representatives may reasonably
         request.

                 (j) At or prior to the Closing Date, the Officers'
         Certificates, Opinions of Counsel and any other document necessary in
         order to validly issue the Securities pursuant to the terms of the
         Indenture shall have been executed and delivered.

                 If any of the conditions specified in this Section 5 shall not
have been fulfilled in all material respects when and as provided in this
Agreement, or if any of the opinions and certificates mentioned above or
elsewhere in this Agreement shall not be in all material respects reasonably
satisfactory in form and substance to the Representatives and counsel for the
Underwriters, this Agreement and all obligations of the Underwriters hereunder
may be canceled at, or at any time prior to, the Closing Date by the
Representatives. Notice of such cancelation shall be given to the Company in
writing or by telephone or telegraph confirmed in writing.

                 Unless the parties hereto otherwise agree, the documents
required to be delivered by this Section 5 shall be delivered at the office of
Cravath, Swaine & Moore, counsel for the
<PAGE>   14
                                                                              14

Underwriters, at Worldwide Plaza, 825 Eighth Avenue, New York, New York, on the
Closing Date.

                 6. Reimbursement of Underwriters' Expenses. If the sale of the
Securities provided for herein is not consummated because any condition to the
obligations of the Underwriters set forth in Section 5 hereof is not satisfied,
because of any termination pursuant to Section 9 hereof or because of any
refusal, inability or failure on the part of the Company or the Guarantor to
perform any agreement herein or comply with any provision hereof other than by
reason of a default by any of the Underwriters, the Company will reimburse the
Underwriters severally through Salomon Smith Barney upon demand for all
reasonable out-of-pocket expenses (including reasonable fees and disbursements
of one Underwriters' counsel) that shall have been incurred by them in
connection with the proposed purchase and sale of the Securities.

                 7. Indemnification and Contribution. (a) Each of the Company
and the Guarantor, jointly and severally, agrees to indemnify and hold harmless
each Underwriter (including the Independent Underwriter in its role as
qualified independent underwriter pursuant to the rules of the NASD), the
directors, officers, employees and agents of each Underwriter and each person
who controls any Underwriter within the meaning of either the Act or the
Exchange Act against any and all losses, claims, damages or liabilities, joint
or several, to which they or any of them may become subject under the Act, the
Exchange Act or other Federal or state statutory law or regulation, at common
law or otherwise, insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any untrue statement
or alleged untrue statement of a material fact contained in the registration
statement for the registration of the Securities as originally filed or in any
amendment thereof or in the Basic Prospectus, any Preliminary Final Prospectus
or the Final Prospectus, or in any amendment thereof or supplement thereto, or
arise out of or are based upon the omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein not misleading, and agrees to reimburse each such
indemnified party, as incurred, for any legal or other expenses reasonably
incurred by them in connection with investigating or defending any such loss,
claim, damage, liability or action; provided, however, that (i) the Company and
the Guarantor will not be liable in any such case to the extent that any such
loss, claim, damage or liability arises out of or is based upon any such untrue
statement or alleged untrue statement or omission or alleged omission made
therein in reliance upon and in conformity with written information furnished
to the Company by or on behalf of any Underwriter through the Representatives
specifically for inclusion therein and (ii) with respect to any untrue
statement or omission of a material fact made in any Preliminary Final
Prospectus, the indemnity agreement contained in this Section 7(a) shall not
inure to the benefit of any Underwriter (or any of the directors, officers,
employees and agents of such Underwriter or any controlling person of such
Underwriter) from whom the person asserting any such loss, claim, damage or
liability purchased the Securities concerned, to the extent that any such loss,
claim, damage or liability of such Underwriter occurs under the circumstances
where it shall have been determined by a court of competent jurisdiction by
final and nonappealable judgment that (w) the Company had previously furnished
copies of the Final Prospectus to the Representatives, (x) delivery of the
Final Prospectus was required by the Act to be made to such person, (y) the
untrue statement or omission of a material fact contained in the Preliminary
Final Prospectus was corrected in the Final Prospectus and (z) there was not
sent or given to such person, at or prior to the written confirmation of the
sale of such Securities to such person, a copy of the Final Prospectus. This
indemnity agreement will be in addition to any liability which the Company may
otherwise have.

                 Each of the Company and the Guarantor, jointly and severally,
also will indemnify and hold harmless the Independent Underwriter, its officers
and employees and each
<PAGE>   15
                                                                              15

person, if any, who controls the Independent Underwriter within the meaning of
the Act, from and against any and all losses, claims, damages, liabilities and
judgments incurred as a result of the Independent Underwriter's participation
as a "qualified independent underwriter" within the meaning of Rule 2720 of the
Conduct Rules of the NASD in connection with the offering of the Securities,
except for any losses, claims, damages, liabilities and judgments found in a
final judgment by a court to have resulted from the Independent Underwriter's
or such officer's, employee's or controlling person's wilful misconduct or
gross negligence.

                 (b) Each Underwriter severally and not jointly agrees to
indemnify and hold harmless the Company, the Guarantor, each of their
respective directors, each of their respective officers who signs the
Registration Statement and each person who controls the Company or the
Guarantor within the meaning of either the Act or the Exchange Act, to the same
extent as the foregoing indemnity from the Company and the Guarantor to each
Underwriter, but only with reference to written information relating to such
Underwriter furnished to the Company by or on behalf of such Underwriter
through the Representatives specifically for inclusion in the documents
referred to in the foregoing indemnity, and will reimburse the Company and the
Guarantor and such other persons for any legal or other expenses reasonably
incurred by the Company, the Guarantor or such other persons in connection with
investigating or defending any such action or claim as such expenses are
incurred. This indemnity agreement will be in addition to any liability which
any Underwriter may otherwise have. The Company acknowledges that the
statements set forth in the last paragraph of the cover page and in the fourth
paragraph, the third sentence of the fifth paragraph, the last sentence of the
seventh paragraph and the eighth paragraph under the heading "Underwriting" in
any Final Prospectus or the Preliminary Final Prospectus constitute the only
information furnished in writing by or on behalf of the several Underwriters
for inclusion in the documents referred to in the foregoing indemnity and you,
as the Representatives, confirm that such statements are correct.

                 (c) Promptly after receipt by an indemnified party under this
Section 7 of notice of the commencement of any action, such indemnified party
will, if a claim in respect thereof is to be made against the indemnifying
party under this Section 7, notify the indemnifying party in writing of the
commencement thereof; but the failure so to notify the indemnifying party (i)
will not relieve it from liability under paragraph (a) or (b) above unless and
to the extent it did not otherwise learn of such action and such failure
results in the forfeiture by the indemnifying party of substantial rights and
defenses and (ii) will not, in any event, relieve the indemnifying party from
any obligations to any indemnified party other than the indemnification
obligation provided in paragraph (a) or (b) above. The indemnifying party shall
be entitled to appoint counsel of the indemnifying party's choice at the
indemnifying party's expense to represent the indemnified party in any action
for which indemnification is sought (in which case the indemnifying party shall
not thereafter be responsible for the fees and expenses of any separate counsel
retained by the indemnified party or parties except as set forth below);
provided, however, that such counsel shall be reasonably satisfactory to the
indemnified party. Notwithstanding the indemnifying party's election to appoint
counsel to represent the indemnified party in an action, the indemnified party
shall have the right to employ separate counsel (including one local counsel),
and the indemnifying party shall bear the reasonable fees, costs and expenses
of such separate counsel if (i) the use of counsel chosen by the indemnifying
party to represent the indemnified party would present such counsel with a
conflict of interest, (ii) the actual or potential defendants in, or targets
of, any such action include both the indemnified party and the indemnifying
party and the indemnified party shall have reasonably concluded that there may
be legal defenses available to it and/or other indemnified parties which are
different from or additional to those available to the indemnifying party,
(iii) the indemnifying party shall not have employed counsel reasonably
satisfactory to the indemnified party to represent the indemnified party within
a
<PAGE>   16
                                                                              16

reasonable time after notice of the institution of such action or (iv) the
indemnifying party shall authorize in writing the indemnified party to employ
separate counsel at the expense of the indemnifying party. If indemnity is
sought pursuant to the second paragraph of Section 7(a), then, in addition to
such counsel for the indemnified parties, the indemnifying party shall be
liable for the reasonable fees and expenses of not more than one separate
counsel (in addition to any necessary local counsel) for the Independent
Underwriter in its capacity as a "qualified independent underwriter," its
officers and employees and all persons, if any, who control the Independent
Underwriter within the meaning of the Act, if, in the reasonable judgment of
the Independent Underwriter there may exist a conflict of interest between the
Independent Underwriter and the other indemnified parties. In the case of any
such separate counsel for the Independent Underwriter and such officers,
employees and control persons of the Independent Underwriter, such counsel
shall be designated in writing by the Independent Underwriter. An indemnifying
party will not, without the prior written consent of the indemnified parties,
settle or compromise or consent to the entry of any judgment with respect to
any pending or threatened claim, action, suit or proceeding in respect of which
indemnification or contribution may be sought hereunder (whether or not the
indemnified parties are actual or potential parties to such claim or action)
unless such settlement, compromise or consent includes an unconditional release
of each indemnified party from all liability arising out of such claim, action,
suit or proceeding. An indemnifying party shall not be liable under this
Section 7 to any indemnified party regarding any settlement or compromise or
consent to the entry of any judgment with respect to any pending or threatened
claim, action, suit or proceeding in respect of which indemnification or
contribution may be sought hereunder (whether or not the indemnified parties
are actual or potential parties to such claim or action) unless such
settlement, compromise or consent is consented to in writing by such
indemnifying party, which consent shall not be unreasonably withheld.

                 (d) In the event that the indemnity provided in paragraph (a)
or (b) of this Section 7 is unavailable to or insufficient to hold harmless an
indemnified party for any reason, the Company, the Guarantor and the
Underwriters agree to contribute to the aggregate losses, claims, damages and
liabilities (including legal or other expenses reasonably incurred in
connection with investigating or defending same) (collectively "Losses") to
which the Company, the Guarantor and one or more of the Underwriters may be
subject in such proportion as is appropriate to reflect the relative benefits
received by the Company and the Guarantor on the one hand and by the
Underwriters on the other from the offering of the Securities; provided,
however, that in no such case shall any Underwriter (except as may be provided
in any agreement among underwriters relating to the offering of the Securities)
be responsible for any amount in excess of the underwriting discount or
commission applicable to the Securities purchased by such Underwriter
hereunder. If the allocation provided by the immediately preceding sentence is
unavailable for any reason, the Company, the Guarantor and the several
Underwriters shall contribute in such proportion as is appropriate to reflect
not only such relative benefits but also the relative fault of the Company and
the Guarantor on the one hand and of the Underwriters on the other in
connection with the statements or omissions which resulted in such Losses as
well as any other relevant equitable considerations. Benefits received by the
Company and the Guarantor on the one hand shall be deemed to be equal to the
total net proceeds from the offering (before deducting expenses), and benefits
received by the Underwriters shall be deemed to be equal to the total
underwriting discounts and commissions, in each case as set forth on the cover
page of the Final Prospectus. Relative fault shall be determined by reference
to whether any alleged untrue statement or omission relates to information
provided by the Company or the Guarantor, on the one hand, or the Underwriters,
on the other, the intent of the parties and their relative knowledge, access to
information and opportunity to correct or prevent such untrue statement or
omission. The Company, the Guarantor and the Underwriters agree that Salomon
Smith Barney
<PAGE>   17
                                                                              17

will not receive any additional benefits hereunder for services as Independent
Underwriter in connection with the offering and sale of the Securities. The
Company, the Guarantor and the Underwriters agree that it would not be just and
equitable if contribution were determined by pro rata allocation or any other
method of allocation which does not take account of the equitable
considerations referred to above. Notwithstanding the provisions of this
paragraph (d), no person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Act) shall be entitled to contribution from any
person who was not guilty of such fraudulent misrepresentation. The obligation
of the Underwriters to contribute pursuant to this Section 7(d) shall be
several in proportion to their respective underwriting commitments, and not
joint.  For purposes of this Section 7, each person who controls an Underwriter
within the meaning of either the Act or the Exchange Act and each director,
officer, employee and agent of an Underwriter shall have the same rights to
contribution as such Underwriter, and each person who controls the Company or
the Guarantor within the meaning of either the Act or the Exchange Act, each
officer of the Company or the Guarantor who shall have signed the Registration
Statement and each director of the Company or the Guarantor shall have the same
rights to contribution as the Company or the Guarantor, as applicable, subject
in each case to the applicable terms and conditions of this paragraph (d).

                 8. Default by an Underwriter. If any one or more Underwriters
shall fail to purchase and pay for any of the Securities agreed to be purchased
by such Underwriter hereunder and such failure to purchase shall constitute a
default in the performance of its obligations under this Agreement, the
remaining Underwriters shall be obligated severally to take up and pay for (in
the respective proportions which the amount of Securities set forth opposite
their names in Schedule II hereto bears to the aggregate amount or number of
Securities set forth opposite the names of all the remaining Underwriters) the
Securities which the defaulting Underwriter agreed but failed to purchase;
provided, however, that in the event that the aggregate amount of 2008 Notes or
2028 Notes which the defaulting Underwriter or Underwriters agreed but failed
to purchase shall exceed 10% of the aggregate amount of 2008 Notes or 2028
Notes, as applicable, set forth in Schedule II hereto, the remaining
Underwriters shall have the right to purchase all, but shall not be under any
obligation to purchase any, of the 2008 Notes or 2028 Notes, as applicable, and
if such nondefaulting Underwriters do not purchase all the 2008 Notes or 2028
Notes, as applicable, this Agreement will terminate without liability to any
nondefaulting Underwriter or the Company. In the event of a default by any
Underwriter as set forth in this Section 8, the Closing Date shall be postponed
for such period, not exceeding five Business Days, as the Representatives shall
determine in order that the required changes in the Registration Statement and
the Final Prospectus or in any other documents or arrangements may be effected.
Nothing contained in this Agreement shall relieve any defaulting Underwriter of
its liability, if any, to the Company and the Guarantor and any nondefaulting
Underwriter for damages occasioned by its default hereunder. For purposes of
this Agreement, "Business Day" shall mean any day other than a Saturday, Sunday
or legal holiday or a day on which banking institutions or trust companies are
authorized or obligated by law to close in New York City.

                 9. Termination. This Agreement shall be subject to termination
in the absolute discretion of the Representatives, by notice given to the
Company prior to delivery of and payment for the Securities, if prior to such
time (i) trading in the Company's Common Stock shall have been suspended by the
Commission or the New York Stock Exchange or trading in securities generally on
the New York Stock Exchange shall have been suspended or limited or minimum
prices shall have been established on such Exchange, (ii) a banking moratorium
shall have been declared either by Federal or New York State authorities or
(iii) there shall have occurred any outbreak or escalation of hostilities,
declaration by the United States of a national emergency or war or other
calamity or crisis the effect of which on financial markets is such as to
<PAGE>   18
                                                                              18

make it, in the judgment of the Representatives, impracticable or inadvisable
to proceed with the offering or delivery of the Securities as contemplated by
the Final Prospectus (exclusive of any supplement thereto).

                 10. Representations and Indemnities to Survive. The respective
agreements, representations, warranties, indemnities and other statements of
the Company or its officers and of the Underwriters set forth in or made
pursuant to this Agreement will remain in full force and effect, regardless of
any investigation made by or on behalf of any Underwriter or the Company or any
of the officers, directors or controlling persons referred to in Section 7
hereof, and will survive delivery of and payment for the Securities. The
provisions of Sections 6 and 7 hereof shall survive the termination or
cancelation of this Agreement.

                 11. Notices. All communications hereunder will be in writing
and effective only on receipt, and, if sent to the Representatives or the
Underwriters, will be mailed, delivered or telegraphed and confirmed to them
(or to the Underwriters in care of the Representatives), at the address of the
Representatives specified in Schedule I hereto; or, if sent to the Company,
will be mailed, delivered or telegraphed and confirmed to it at 1400 Williams
Square West, 5205 North O'Connor Boulevard, Irving, Texas 75039, attention M.
Garrett Smith.

                 12. Successors. This Agreement will inure to the benefit of
and be binding upon the parties hereto and their respective successors and the
individuals and directors and controlling persons referred to in Section 7
hereof, and no other person will have any right or obligation hereunder.

                 13. APPLICABLE LAW. THIS AGREEMENT WILL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO
CONTRACTS MADE AND TO BE PERFORMED WITHIN THE STATE OF NEW YORK WITHOUT
REFERENCE TO PRINCIPLES OF CONFLICTS OF LAWS.

                 14. Counterparts. This Agreement may be signed in one or more
counterparts, each of which shall constitute an original and all of which
together shall constitute one and the same agreement.

                 15. Headings. The section holdings used herein are for
convenience only and shall not affect the construction hereof.

                 If the foregoing is in accordance with your understanding of
our agreement, please sign and return to us the enclosed duplicate hereof,
whereupon this letter and your
<PAGE>   19


acceptance shall represent a binding agreement among the Company, the Guarantor
and the several Underwriters.


                                        Very truly yours,

                                        Pioneer Natural Resources Company,



                                        By:/s/ M. GARRETT SMITH
                                           ----------------------------------
                                           Name:   M. Garrett Smith
                                           Title:  Executive Vice President and
                                                   Chief Financial Officer


                                        Pioneer Natural Resources USA, Inc.




                                        By: /s/ M. GARRETT SMITH
                                           ----------------------------------
                                           Name:   M. Garrett Smith
                                           Title:  Executive Vice President and
                                                   Chief Financial Officer


The foregoing Agreement is
hereby confirmed and accepted
as of the date specified in
Schedule I hereto.

By:  Salomon Brothers Inc
     Chase Securities Inc.
     J. P. Morgan Securities Inc.
     Morgan Stanley & Co. Incorporated
     NationsBanc Montgomery Securities LLC


By:  /s/ JAMES C.V. ROGERS
     -------------------------------------
     Name:   James C.V. Rogers
     Title:  Director


For themselves and the other several
Underwriters, if any, named in
Schedule II to the foregoing Agreement.
<PAGE>   20
                                    ANNEX I

                 Pursuant to Section 5(f) of the Underwriting Agreement, the
Appropriate Accountants shall have furnished to the Representatives a letter or
letters, dated respectively as of the Execution Time and as of the Closing Date
(which may be in the form of a "bring down" letter), in form and substance
satisfactory to the Representatives, confirming that they are independent
accountants within the meaning of the Act and the Exchange Act and the
applicable published rules and regulations thereunder and that they have
audited the year-end financial information included or incorporated in the
Registration Statement and the Final Prospectus and performed a review of the
unaudited interim financial information included or incorporated in the
Registration Statement and the Final Prospectus in accordance with Statement of
Auditing Standards No. 71 and stating in effect that:

                 (i) in their opinion the audited financial statements and
         financial statement schedules and pro forma financial statements
         included in the Registration Statement and the Final Prospectus
         (including those incorporated therein by reference) and reported on by
         them comply in form in all material respects with the applicable
         accounting requirements of the Act and the related published rules and
         regulations,

                 (ii) on the basis of a reading of the latest unaudited
         financial statements made available by the Relevant Entity (as defined
         herein); their limited review in accordance with standards established
         by the American Institute of Certified Public Accountants under
         Statement of Auditing Standards No. 71 of any unaudited interim
         financial information as included in the Registration Statement and
         Final Prospectus (including those incorporated therein by reference),
         carrying out certain specified procedures (but not an examination in
         accordance with generally accepted auditing standards) which would not
         necessarily reveal matters of significance with respect to the
         comments set forth in such letter, a reading of the minutes of the
         meetings of the stockholders, directors, and any committees of the
         Relevant Entity the Representatives may reasonably request; and
         inquiries of certain officials of the Relevant Entity who have
         responsibility for financial and accounting matters of the Relevant
         Entity as to transactions and events subsequent to the date of the
         most recent financial statements included in the Final Prospectus,
         nothing came to their attention which caused them to believe that:

                          (1) any unaudited financial statements included in
                 the Registration Statement and the Final Prospectus do not
                 comply as to form in all material respects with the applicable
                 accounting requirements of the Act and with the published
                 rules and regulations of the Commission with respect to
                 financial statements included or incorporated in quarterly
                 reports on Form 10-Q under the Exchange Act; or said unaudited
                 financial statements are not in conformity with generally
                 accepted accounting principles applied on a basis
                 substantially consistent with that of the audited financial
                 statements included in the Registration Statement and the
                 Final Prospectus; or

                          (2) with respect to the period subsequent to the date
                 of the most recent financial statements (other than capsule
                 information), audited or unaudited, included or incorporated
                 in the Registration Statement and the
<PAGE>   21
                                                                               2

                 Final Prospectus, there were any changes, at a specified date
                 not more than five business days prior to the date of the
                 letter, in the long-term debt, less current maturities, of the
                 Relevant Entity or capital stock of the Relevant Entity or
                 decreases in the total stockholders' equity of the Relevant
                 Entity or other balance sheet items the Representatives may
                 reasonably request as compared with the amounts shown on the
                 most recent financial statements included or incorporated in
                 the Registration Statement and the Final Prospectus to such
                 specified date, or there were any decreases, as compared with
                 the corresponding period in the preceding year or the
                 preceding quarter in net revenues or income before income
                 taxes or in total or per share amounts of net income of the
                 Relevant Entity or any other income statement items as the
                 Representatives may reasonably request, except in all
                 instances for changes or decreases set forth in such letter,
                 in which case the letter shall be accompanied by an
                 explanation by the Company as to the significance thereof
                 unless said explanation is not deemed necessary by the
                 Representatives, or

                          (3) the information included in the Registration
                 Statement and Final Prospectus in response to Regulation S-K,
                 Item 301 (Selected Financial Data), Item 302 (Supplementary
                 Financial Information), Item 402 (Executive Compensation), and
                 Item 503 (Ratio of Earnings to Fixed Charges) is not in
                 conformity with the applicable disclosure requirements of
                 Regulation S-K, and

                 (iii)  they have performed certain other specified procedures
         as a result of which they determined that certain information of an
         accounting, financial or statistical nature (which is limited to
         accounting, financial or statistical information derived from the
         general accounting records of the Relevant Entity) set forth in the
         Registration Statement and the Final Prospectus, including the
         information in Items 1, 2, 6, 7 and 11 of any Annual Report on Form
         10-K, included or incorporated in the Registration Statement and the
         Final Prospectus, and the information included in the "Management's
         Discussion and Analysis of Financial Condition and Results of
         Operations" included or incorporated in any Relevant Entity's
         Quarterly Reports on Form 10-Q, if any, incorporated in the
         Registration Statement and the Final Prospectus, agrees with the
         accounting records of the Relevant Entity, excluding any questions of
         legal interpretation; and

                 (iv) on the basis of a reading of the unaudited pro forma
         financial statements, carrying out certain specified procedures,
         inquiries of certain officials of the Relevant Entity and the acquired
         entity who have responsibility for financial and accounting matters,
         and proving the arithmetic accuracy of the application of the pro
         forma adjustments to the historical amounts in the pro forma financial
         statements, nothing came to their attention which caused them to
         believe that the pro forma financial statements do not comply in form
         in all material respects with the applicable accounting requirements
         of Rule 11-02 of Regulation S-X or that the pro forma adjustments have
         not been properly applied to the historical amounts in the compilation
         of such statements.

                 References to the Final Prospectus in this Annex I include any
supplement thereto at the date of the letter.
<PAGE>   22
                                                                               3

                 As used in Annex 1, "Appropriate Accountant" means the firm of
accountants who certified that the Relevant Entity's financial statements were
prepared in accordance with generally accepted accounting principles and
complied with the Act and the Exchange Act and the applicable published rules
and regulations thereunder.

                 As used in Annex 1, the "Relevant Entity" means any entity
whose financial statements are included or incorporated by reference in the
Registration Statement or the Final Prospectus which may include, without
limitation, the Company, Parker & Parsley Petroleum Company, MESA Inc. and
Chauvco Resources Ltd., as the case may be.
<PAGE>   23
                                   SCHEDULE I


        Representatives:                 Salomon Brothers Inc
                                         Seven World Trade Center
                                         New York, New York 10048
                                         Fax Number (212) 783-2278
                                         
                                         Chase Securities Inc.
                                         270 Park Avenue
                                         New York, NY 10017
                                         Fax Number (212) 834-6170
                                         
                                         J.P. Morgan Securities Inc.
                                         60 Wall Street
                                         New York, New York 10260
                                         Fax Number (212) 648-5939
                                         
                                         Morgan Stanley & Co., Incorporated
                                         1585 Broadway
                                         New York, NY 10036
                                         Fax Number (212) 761-0353
                                         
                                         NationsBanc Montgomery Securities LLC
                                         NationsBank Corporate Center
                                         100 North Tryon Street
                                         Charlotte, NC 28255
                                         Fax Number (704) 388-9939
<PAGE>   24
                                  SCHEDULE II



<TABLE>
<CAPTION>
                                                       Principal Amount     Principal Amount
                                                        of 2008 Notes        of 2028 Notes
Underwriter                                            To Be Purchased      To Be Purchased
- -----------                                            ----------------     ----------------
<S>                                                       <C>                 <C>
Salomon Brothers Inc. ............................        $105,100,000        $ 75,500,000
                                                    
Chase Securities Inc. ............................         105,100,000          75,500,000
                                                    
J. P. Morgan Securities Inc. .....................          46,600,000          33,000,000
                                                    
Morgan Stanley & Co. Incorporated ................          46,600,000          33,000,000
                                                    
NationsBanc Montgomery Securities LLC. ...........          46,600,000          33,000,000
                                                          ------------        ------------
            Total.................................        $350,000,000        $250,000,000
                                                          ============        ============
</TABLE>


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