UNITED STATES
                       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 21, 2005




                        Pioneer Natural Resources Company
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)



          Delaware                    1-13245               75-2702753
----------------------------        ------------        -------------------
(State or other jurisdiction        (Commission          (I.R.S. Employer
      of incorporation)             File Number)        Identification No.)



5205 N. O'Connor Blvd., Suite 900, Irving, Texas              75039
------------------------------------------------            ----------
   (Address of principal executive offices)                 (Zip Code)


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



                                 Not applicable
          -------------------------------------------------------------
          (Former name or former address, if changed since last report)


Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

| | Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)
| | Soliciting material  pursuant to Rule 14a-12  under the Exchange Act (17 CFR
    240.14a-12)
| | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))
| | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))








                        PIONEER NATURAL RESOURCES COMPANY

                                TABLE OF CONTENTS


                                                                        Page

Item 1.01.  Entry into a Material Definitive Agreement................    3

Item 2.03.  Creation of a Direct Financial Obligation or an
            Obligation under an Off-Balance Sheet Arrangement
            of a Registrant...........................................    3

Item 9.01.  Financial Statements and Exhibits

            (c)   Exhibits............................................    3

Signature.............................................................    4

Exhibit Index.........................................................    5



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                        PIONEER NATURAL RESOURCES COMPANY


Item 1.01.   Entry into a Material Definitive Agreement

     On January 21, 2005,  Pioneer Natural  Resources Company (the "Company") as
the Borrower;  JPMorgan Chase Bank as the Administrative  Agent;  JPMorgan Chase
Bank and Bank of America,  N.A., as the Issuing Banks;  Wachovia Bank,  National
Association as the  Syndication  Agent;  Bank of America,  N.A., Bank One, N.A.,
Fleet  National  Bank  and  Wells  Fargo  Bank,  National  Association,  as  the
Co-Documentation  Agents;  J.P.  Morgan  Securities  Inc. and  Wachovia  Capital
Markets,  LLC, as the  Co-Arrangers  and Joint  Bookrunners;  and certain  other
lenders  entered  into a Second  Amendment,  dated as of January  21,  2005 (the
"Second  Amendment"),  to the Company's  $700 million  5-Year  Revolving  Credit
Agreement  dated as of December  16, 2003 (the "Credit  Agreement").  The Second
Amendment  amends  Sections 1.01,  6.01 and 6.02 of the Credit  Agreement and is
attached hereto as Exhibit 99.1.

     Also on January 21, 2005, the Company as the Borrower;  JPMorgan Chase Bank
as the  Administrative  Agent; Bank of America,  N.A.,  Barclays Bank PLC, Wells
Fargo Bank, National Association and Wachovia Bank, National Association, as the
Co-Documentation  Agents;  J.P. Morgan  Securities Inc. as the Lead Arranger and
Sole Bookrunner;  and certain other lenders entered into a First Amendment dated
as of January 21, 2005 (the "First  Amendment"),  to the Company's  $900 million
364-Day Credit  Agreement,  dated as of September 28, 2004 (the "364-Day  Credit
Agreement").  The First  Amendment  amends  Sections 1.01,  6.01 and 6.02 of the
364-Day Credit Agreement and is attached hereto as Exhibit 99.2.

     Many of the parties to the First  Amendment  and the Second  Amendment  are
also counterparties to the Company's derivative hedge instruments.

Item 2.03.   Creation of a Direct Financial Obligation or an Obligation under an
             Off-Balance Sheet Arrangement of a Registrant

     The  information  described  above  under  "Item 1.01 Entry into a Material
Definitive Agreement" is incorporated herein by reference.

Item 9.01.   Financial Statements and Exhibits

       (c)   Exhibits

             99.1   Second Amendment to 5-Year Revolving  Credit Agreement dated
                    as of January 21,  2005 among the Company,  as the Borrower;
                    JPMorgan Chase  Bank as the  Administrative Agent;  JPMorgan
                    Chase Bank  and Bank of America, N.A., as the Issuing Banks;
                    Wachovia  Bank,  National  Association  as  the  Syndication
                    Agent; Bank of America, N.A., Bank One, N.A., Fleet National
                    Bank and Wells Fargo Bank, National Association,  as the Co-
                    Documentation  Agents;   J.P.  Morgan  Securities  Inc.  and
                    Wachovia Capital Markets, LLC, as the Co-Arrangers and Joint
                    Bookrunners; and certain other lenders.

             99.2   First Amendment  to 364-Day  Credit  Agreement  dated  as of
                    January  21,  2005  among  the  Company,  as  the  Borrower;
                    JPMorgan Chase  Bank as the  Administrative  Agent;  Bank of
                    America, N.A., Barclays Bank PLC, Wells Fargo Bank, National
                    Association and Wachovia Bank,  National  Association as the
                    Co-Documentation Agents;  J.P. Morgan Securities Inc. as the
                    Lead  Arranger  and  Sole  Bookrunner;   and  certain  other
                    lenders.



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                        PIONEER NATURAL RESOURCES COMPANY

                                S I G N A T U R E

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

                               PIONEER NATURAL RESOURCES COMPANY




Date:  January 27, 2005        By:     /s/ Darin G. Holderness
                                     -------------------------------------------
                                     Darin G. Holderness
                                     Vice President and Chief Accounting Officer



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                        PIONEER NATURAL RESOURCES COMPANY

                                  EXHIBIT INDEX


Exhibit No.             Description

   99.1(a)              Second  Amendment to 5-Year  Revolving  Credit Agreement
                        dated as of January 21,  2005 among the Company,  as the
                        Borrower;  JPMorgan  Chase  Bank  as the  Administrative
                        Agent; JPMorgan Chase Bank and Bank of America, N.A., as
                        the Issuing Banks;  Wachovia Bank,  National Association
                        as the Syndication Agent;  Bank of America,  N.A.,  Bank
                        One, N.A.,  Fleet  National Bank and  Wells Fargo  Bank,
                        National Association,  as the  Co-Documentation  Agents;
                        J.P.  Morgan  Securities  Inc.   and  Wachovia   Capital
                        Markets, LLC, as the Co-Arrangers and Joint Bookrunners;
                        and certain other lenders.
   99.2(a)              First Amendment  to 364-Day Credit Agreement dated as of
                        January 21,  2005  among the  Company,  as the Borrower;
                        JPMorgan Chase Bank as the Administrative Agent; Bank of
                        America,  N.A.,  Barclays  Bank PLC,  Wells Fargo  Bank,
                        National  Association   and  Wachovia   Bank,   National
                        Association as the Co-Documentation Agents;  J.P. Morgan
                        Securities   Inc.   as  the   Lead  Arranger   and  Sole
                        Bookrunner; and certain other lenders.


-------------
(a) filed herewith




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