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 23, 2003




                        PIONEER NATURAL RESOURCES COMPANY
                       -----------------------------------
             (Exact name of Registrant as specified in its charter)



          DELAWARE                      1-13245               75-2702753
-------------------------------       ------------       ---------------------
(State or other jurisdiction of        Commission          (I.R.S. Employer
incorporation or organization)         File Number       Identification Number)



5205 N. O'CONNOR BLVD., SUITE 1400, IRVING, TEXAS               75039
-------------------------------------------------            -----------
    (Address of principal executive offices)                  (Zip code)



       Registrant's Telephone Number, including area code : (972) 444-9001


                                 Not applicable
              (Former name, former address and former fiscal year,
                          if changed since last report)







                        PIONEER NATURAL RESOURCES COMPANY

                                TABLE OF CONTENTS


                                                                         Page

Item 7.  Financial Statements, Pro Forma Financial
         Information and Exhibits:

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

Item 9.  Regulation FD Disclosure....................................      3

Signatures...........................................................      4

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




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                        PIONEER NATURAL RESOURCES COMPANY


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

       (c)   Exhibits

             99.1   News Release dated January 23, 2003
             99.2   Supplemental schedule attachment to news release dated
                    January 23, 2003
             99.3   News Release dated January 23, 2002

ITEM 9.      REGULATION FD DISCLOSURE

       The information in this document includes forward-looking statements that
are made  pursuant  to the Safe  Harbor  Provisions  of the  Private  Securities
Litigation  Reform Act of 1995.  Forward-looking  statements,  and the  business
prospects of Pioneer Natural  Resources Company (the "Company") are subject to a
number of risks and  uncertainties  which may cause the Company's actual results
in future  periods to differ  materially  from the  forward-looking  statements.
These risks and uncertainties include, among other things, volatility of oil and
gas prices, product supply and demand, competition, international operations and
associated   international   political  and  economic  instability,   government
regulation or action, foreign currency valuation changes, foreign government tax
and  regulation  changes,  litigation,  the costs and  results of  drilling  and
operations,  the Company's ability to replace  reserves,  implement its business
plans, or complete its development projects as scheduled,  access to and cost of
capital,  uncertainties about estimates of reserves,  quality of technical data,
environmental  and weather  risks.  These and other risks are  described  in the
Company's  2001 Annual  Report on Form 10-K and  Quarterly  Reports on Form 10-Q
that are available from the Company or the Securities and Exchange Commission.

       On January 23,  2003,  the Company issued a news release that is attached
hereto as exhibit 99.1. The news release announced the Company's proved reserves
as of December  31,  2002,  and related  reserve  replacement  and finding  cost
statistics for the  one-, three- and five-year  periods ended December 31, 2002;
announced  the  Company's  2003 capital  budget and growth plan;  and provided a
supplemental  schedule,  that is  attached  hereto as  exhibit  99.2,  of proved
reserves  and costs  incurred  detail  information  as of and for the year ended
December 31, 2002.

        On January 23,  2003,  the Company  also issued a news  release  that is
attached  hereto as exhibit 99.3.  The news release  attached  hereto as exhibit
99.3 announced that the Company and Woodside  Energy (USA) Inc., a subsidiary of
Woodside Energy Ltd. of Australia,  have agreed to a joint  exploration  program
for a two-year campaign over the shallow-water Texas Shelf region of the Gulf of
Mexico.

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                        PIONEER NATURAL RESOURCES COMPANY

                               S I G N A T U R E S

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 23, 2003        By:    /s/ RICHARD P. DEALY
                                    -------------------------------------------
                                    Richard P. Dealy
                                    Vice President and Chief Accounting Officer



                                       4







                        PIONEER NATURAL RESOURCES COMPANY

                                  EXHIBIT INDEX


Exhibit No.       Description

   99.1*          News Release dated January 23, 2003
   99.2*          Supplemental schedule attachment to news release dated January
                  23, 2003
   99.3*          News Release dated January 23, 2003



-------------
* filed herewith



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