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): March 31, 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 March 31, 2003
            99.2   News Release dated March 31, 2003


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,  acts of war and  terrorism.  These and other
risks  are  described  in the  Company's  2002  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 March 31, 2003, the Company issued two news releases that are attached
hereto as exhibits 99.1 and 99.2.

       The news release included herein as exhibit 99.1 announced, together with
related information,  (i) that production began from the Company-operated Falcon
field in the  western  deepwater  Gulf of Mexico on March 15,  2003 and that the
two-well development is currently producing approximately 185 million cubic feet
of gas and 650 barrels of condensate per day, (ii) that the Company has approved
the development of the Harrier discovery, which has estimated gas reserves of 55
to 80 billion cubic feet, as a single-well  subsea  tie-back to the Falcon field
facilities,  and (iii) that the Company has  acquired  the  remaining 25 percent
working  interest  that it did not already own in 32 blocks in the Falcon  area,
including the Falcon field,  the Harrier field and related  satellite  prospects
from Mariner Energy  ("Mariner")  for a net cash payment of  approximately  $113
million  including  normal  closing  adjustments  and the  assumption of certain
contractual  obligations  of Mariner.  The Mariner  transaction  was approved by
Mariner's  board of directors  and was closed on Friday,  March 28,  2003,  with
payment into escrow. The transfer from escrow is contingent upon receipt of a no
objection  notice from the  creditors  committee of Enron  Corp.,  which owns an
interest in Mariner.

       The news release included herein as exhibit 99.2 announced, together with
related information, (i) that the Company has set a new Company record for North
American gas production  with the addition of production  from the Falcon field,
the  second of five  significant  projects  that the  Company  plans to bring on
stream  through  early 2004;  and expects  that the  Company's  worldwide  daily
production  will be up  approximately  80  percent  from where it started in the
second  quarter  of 2002 and that  U.S.  gas  production  is  expected  to be up
approximately  180  percent  over the same  period in 2002 and (ii)  provided an
update on  operations  conducted  during the first  quarter  of 2003,  including
results of its development and exploration drilling activities.


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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:   March 31, 2003         By:    /s/ RICHARD P. DEALY
                                    -------------------------------------------
                                    Richard P. Dealy
                                    Vice President and Chief Accounting Officer


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                        PIONEER NATURAL RESOURCES COMPANY

                                  EXHIBIT INDEX


Exhibit No.       Description

   99.1*          News Release dated March 31, 2003
   99.2*          News Release dated March 31, 2003

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


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