EXHIBIT 99.2

                                 FIRST AMENDMENT

                                       TO

                            364-DAY CREDIT AGREEMENT

                                   dated as of



                                January 21, 2005


                                      among

                       PIONEER NATURAL RESOURCES COMPANY,
                                 as the Borrower

                              JPMORGAN CHASE BANK,
                             as Administrative Agent


                                       and
                            The Lenders Party Hereto


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


           BANK OF AMERICA, N.A., BARCLAYS BANK PLC, WELLS FARGO BANK,
         NATIONAL ASSOCIATION, and WACHOVIA BANK, NATIONAL ASSOCIATION,
                           as Co-Documentation Agents

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

                          J.P. MORGAN SECURITIES INC.,
                      as Lead Arranger and Sole Bookrunner








     THIS FIRST AMENDMENT TO 364-DAY CREDIT  AGREEMENT (this "First  Amendment")
dated as of January  21,  2005,  among  PIONEER  NATURAL  RESOURCES  COMPANY,  a
Delaware  corporation,  as the Borrower,  JPMORGAN CHASE BANK, as Administrative
Agent, the LENDERS party hereto, BANK OF AMERICA, N.A., BARCLAYS BANK PLC, WELLS
FARGO BANK, NATIONAL ASSOCIATION,  AND WACHOVIA BANK, NATIONAL  ASSOCIATION,  as
Co-Documentation  Agents,  and J.P. MORGAN SECURITIES INC., as Lead Arranger and
Sole Bookrunner.

                                 R E C I T A L S

     A. The Borrower,  the Administrative  Agent, the Issuing Banks, the Lenders
party  thereto,  the  Co-Documentation  Agents,  and the Lead  Arranger and Sole
Bookrunner  are parties to that certain  364-Day  Credit  Agreement  dated as of
September 28, 2004 (the "Credit Agreement"),  pursuant to which the Lenders have
made certain credit available to and on behalf of the Borrower.

     B. The Borrower has  requested and the Lenders have agreed to amend certain
provisions of the Credit Agreement.

     C.  NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants herein contained, for good and valuable consideration, the receipt and
sufficiency  of which are  hereby  acknowledged,  the  parties  hereto  agree as
follows:

     Section 1. Defined  Terms.  Each  capitalized  term which is defined in the
Credit Agreement,  but which is not defined in this First Amendment,  shall have
the  meaning  ascribed  such  term in the  Credit  Agreement.  Unless  otherwise
indicated,  all section  references in this First Amendment refer to sections of
the Credit Agreement.

     Section 2. Amendments to Credit Agreement.

     2.1  Amendments to Section 1.01.

     (a) The definition of  "Agreement" in Section 1.01 of the Credit  Agreement
is hereby amended in its entirety to read as follows:

         "Agreement"  means  this  Credit  Agreement,  as  amended by the  First
     Amendment,  as  the  same  may  from  time  to  time be  amended, modified,
     supplemented or restated.

     (b) The definition of "Consolidated  EBITDAX" in Section 1.01 of the Credit
Agreement  shall  be  amended  to add the  following  at the end of  clause  (b)
thereof:

     "; provided,  however,  non-cash  income or  gains in  respect of  deferred
     revenue,  production payments  and other matters included in the definition
     of Indebtedness shall  not be subtracted from Consolidated Net Income under
     this clause (b)."

     (c) The following  definitions  are hereby added in Section 1.01 the Credit
Agreement where alphabetically appropriate to read as follows:







         "Consolidated Net Tangible Assets"  means,  on any date,  the aggregate
     amount of total assets of the Borrower and its Subsidiaries,  minus (a) all
     current liabilities of the Borrower and its Subsidiaries (excluding current
     liabilities  included  in  the  definition  of  Indebtedness and  excluding
     current liabilities attributable to commodities derivative contracts),  (b)
     all goodwill of the Borrower and its Subsidiaries and (c) current and long-
     term  assets  attributable  to   commodities  derivative   contracts,   all
     determined on a consolidated basis in accordance with GAAP.

         "First  Amendment"   means  that  certain  First  Amendment  to  Credit
     Agreement dated as January 21, 2005 among the Borrower,  the Administrative
     Agent and the Lenders party thereto.

     2.2  Amendment to Section  6.01.  Section  6.01 of the Credit  Agreement is
hereby amended to (a) delete the word "and"  immediately  preceding  clause (ii)
and to replace  such word with a  semi-colon  and (b) add the  following  clause
(iii) at the end thereof.

     "; and (iii)  Indebtedness  of  any  Restricted  Subsidiary  in  respect of
     production payments,  forward sales and similar arrangements referred to in
     Section 6.02(g)."

     2.3 Amendment to Section 6.02. The following  clause (g) is hereby added to
Section 6.02 of the Credit Agreement.

         "(g) production  payments,  forward  sales  and  similar  arrangements;
     provided that  the amount  of Indebtedness  attributable  thereto  does not
     exceed fifteen percent (15%) of Consolidated Net Tangible Assets determined
     as of  the time  each such  production  payment,  forward  sale or  similar
     arrangement  is  entered  into  and  determined  based  upon the  financial
     statements then most recently delivered pursuant to Section 5.01(a) or (b),
     and without reduction to Consolidated Net Tangible Assets on account of any
     such production payment, forward sale or similar arrangement."

     Section 3. Conditions Precedent.  The effectiveness of this First Amendment
is subject to the receipt by the Administrative Agent of the following documents
and satisfaction of the other conditions specified in this Section 3:

     3.1 Counterparts of First Amendment.  The  Administrative  Agent shall have
received from the Borrower and the Required  Lenders  multiple  counterparts (in
such  number as may be  requested  by the  Administrative  Agent) of this  First
Amendment signed on behalf of each such party.

     3.2 No Default.  No Default shall have occurred and be continuing as of the
date hereof, after giving effect to the terms of this First Amendment.

     Section 4.   Miscellaneous.

     4.1  Confirmation.  The provisions of the Credit  Agreement,  as amended by
this First  Amendment,  shall remain in full force and effect in accordance with
its terms following the effectiveness of this First Amendment.



                                       2






     4.2  Ratification  and  Affirmation;  Representations  and Warranties.  The
Borrower  hereby (a)  represents and warrants to the Lenders that as of the date
hereof, after giving effect to the terms of this First Amendment, (i) all of the
representations and warranties  contained in each Loan Document to which it is a
party are true and correct,  except to the extent any such  representations  and
warranties  are  expressly  limited  to an earlier  date,  in which  case,  such
representations  and  warranties  shall  continue  to be true and correct in all
material  respects as of such  specified  earlier date,  and (ii) no Default has
occurred and is continuing.

     4.3 Loan Document. This First Amendment is a "Loan Document" as defined and
described in the Credit  Agreement  and all of the terms and  provisions  of the
Credit Agreement, as amended by this First Amendment, relating to Loan Documents
shall apply hereto.

     4.4  Counterparts.  This First  Amendment may be executed by one or more of
the  parties  hereto in any  number of  separate  counterparts,  and all of such
counterparts  taken  together  shall be  deemed to  constitute  one and the same
instrument.  Delivery of this First Amendment by facsimile transmission shall be
effective as delivery of a manually executed counterpart hereof.

     4.5 No Oral Agreement.  This First Amendment,  the Credit Agreement and the
other Loan  Documents  executed  in  connection  therewith  represent  the final
agreement  between the parties and may not be contradicted by evidence of prior,
contemporaneous,  or unwritten  oral  agreements  of the  parties.  There are no
subsequent oral agreements between the parties.

     4.6 GOVERNING LAW. THIS FIRST AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS.

                          [SIGNATURES BEGIN NEXT PAGE]



                                       3









     IN WITNESS WHEREOF,  the parties hereto have caused this First Amendment to
be duly executed as of the date first written above.



BORROWER:                       PIONEER NATURAL RESOURCES COMPANY



                                By:      /s/ Richard P. Dealy
                                     ------------------------------------------
                                Name:    Richard P. Dealy
                                     ------------------------------------------
                                Title:   Executive Vice-President and CFO
                                      -----------------------------------------





                                JPMORGAN CHASE BANK,
                                as a Lender and as Administrative Agent



                                By:      /s/ Robert C. Mertensotto
                                     ------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------





Lead Arranger and
Sole Bookrunner:                J.P. MORGAN SECURITIES INC.
- ----------------



                                By:      /s/ George M. Serice
                                   --------------------------------------------
                                Name:    George M. Serice
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------


          Signature Page to First Amendment to 364-Day Credit Agreement





Documentation Agent & Lender:   BANK OF AMERICA, N.A.
- ----------------------------


                                By:      /s/ Ronald E. McKaig
                                   --------------------------------------------
                                Name:    Ronald E. McKaig
                                     ------------------------------------------
                                Title:   Senior Vice President
                                      -----------------------------------------





Documentation Agent & Lender:   BARCLAYS BANK PLC
- ----------------------------


                                By:      /s/ Nicholas Bell
                                   --------------------------------------------
                                Name:    Nicholas Bell
                                Title:   Director





Documentation Agent & Lender:   WELLS FARGO BANK, NATIONAL ASSOCIATION
- ----------------------------



                                By:      /s/ David C. Brooks
                                   --------------------------------------------
                                Name:    David C. Brooks
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------





Documentation Agent & Lender:   WACHOVIA BANK, NATIONAL ASSOCIATION
- ----------------------------



                                By:      /s/ David Humphreys
                                   --------------------------------------------
                                Name:    David Humphreys
                                Title:   Director



          Signature Page to First Amendment to 364-Day Credit Agreement





Lenders:                        ABN AMRO
- -------


                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------



                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------





                                CITIBANK, N.A.



                                By:      /s/ Joronne Jeter
                                   --------------------------------------------
                                Name:    Joronne Jeter
                                     ------------------------------------------
                                Title:   Attorney-in-Fact
                                      -----------------------------------------





                                CALYON NEW YORK BRANCH


                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------


                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------


          Signature Page to First Amendment to 364-Day Credit Agreement








                                CREDIT SUISSE FIRST BOSTON,
                                acting through its Cayman Islands Branch


                                By:      /s/ Vanessa Gomez
                                   --------------------------------------------
                                Name:    Vanessa Gomez
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------


                                By:      /s/ Cassandra Droogan
                                   --------------------------------------------
                                Name:    Cassandra Droogan
                                     ------------------------------------------
                                Title:   Associate
                                      -----------------------------------------





                                DEUTSCHE BANK AG NEW YORK BRANCH


                                By:      /s/ Michael Starmer-Smith
                                   --------------------------------------------
                                Name:    Michael Starmer-Smith
                                     ------------------------------------------
                                Title:   Managing Director
                                      -----------------------------------------


                                By:      /s/ Joel Makowsky
                                   --------------------------------------------
                                Name:    Joel Makowsky
                                     ------------------------------------------
                                Title:   Director
                                      -----------------------------------------





                                THE BANK OF NOVA SCOTIA



                                By:      /s/ William E. Zarrett
                                   --------------------------------------------
                                Name:    William E. Zarrett
                                     ------------------------------------------
                                Title:   Managing Director
                                      -----------------------------------------



          Signature Page to First Amendment to 364-Day Credit Agreement








                                SCOTIABANC INC.



                                By:      /s/ William E. Zarrett
                                   --------------------------------------------
                                Name:    William E. Zarrett
                                     ------------------------------------------
                                Title:   Managing Director
                                      -----------------------------------------





                                SUNTRUST BANK



                                By:      /s/ Sean Roche
                                   --------------------------------------------
                                Name:    Sean Roche
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------





                                UNION BANK OF CALIFORNIA, N.A.



                                By:      /s/ Scott Myatt
                                   --------------------------------------------
                                Name:    Scott Myatt
                                     ------------------------------------------
                                Title:   Assistant Vice President
                                      -----------------------------------------



          Signature Page to First Amendment to 364-Day Credit Agreement







                                BNP PARIBAS



                                By:      /s/ David Dodd
                                   --------------------------------------------
                                Name:    David Dodd
                                     ------------------------------------------
                                Title:   Director
                                      -----------------------------------------



                                By:      /s/ Betsy Jocher
                                   --------------------------------------------
                                Name:    Betsy Jocher
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------





                                THE BANK OF NEW YORK



                                By:      /s/ Craig J. Anderson
                                   --------------------------------------------
                                Name:    Craig J. Anderson
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------





                                DNB NOR BANK ASA




                                By:      /s/ Nils Fykse
                                   --------------------------------------------
                                Name:    Nils Fykse
                                     ------------------------------------------
                                Title:   Senior Vice President
                                      -----------------------------------------


                                By:      /s/ Stig Kristiansen
                                   --------------------------------------------
                                Name:    Stig Kristiansen
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------


          Signature Page to First Amendment to 364-Day Credit Agreement






                                MIZUHO CORPORATE BANK (USA)



                                By:      /s/ Greg Botshon
                                   --------------------------------------------
                                Name:    Greg Botshon
                                     ------------------------------------------
                                Title:   Senior Vice President
                                      -----------------------------------------





                                U.S. BANK NATIONAL ASSOCIATION



                                By:      /s/ Mark E. Thompson
                                   --------------------------------------------
                                Name:    Mark E. Thompson
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------





                                AUSTRALIA AND NEW ZEALAND BANKING GROUP LIMITED



                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------





                                HARRIS NESBITT FINANCING, INC. (fka BMO NESBITT
                                BURNS FINANCING, INC.)



                                By:      /s/ James V. Ducote
                                   --------------------------------------------
                                Name:    James V. Ducote
                                     ------------------------------------------
                                Title:   Vice President
                                      -----------------------------------------



          Signature Page to First Amendment to 364-Day Credit Agreement





                                KBC BANK N.V.



                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------



                                By:
                                   --------------------------------------------
                                Name:
                                     ------------------------------------------
                                Title:
                                      -----------------------------------------





                                TORONTO DOMINION (TEXAS) LLC



                                By:      /s/ Neva Nesbitt
                                   --------------------------------------------
                                Name:    Neva Nesbitt
                                     ------------------------------------------
                                Title:   Authorized Agent
                                      -----------------------------------------





                                UFJ BANK LIMITED



                                By:      /s/ Clyde L. Redford
                                   --------------------------------------------
                                Name:    Clyde L. Redford
                                Title:   Senior Vice President


          Signature Page to First Amendment to 364-Day Credit Agreement