EXHIBIT 99.1


                                  NEWS RELEASE

                                                               Company Contacts:
                                       Investors: Frank Hopkins or Chris Paulsen
                                      Media and Public Affairs:   Susan Spratlen
                                                                  (972) 444-9001


                   Pioneer Reports First Quarter 2005 Results

Dallas, Texas, May 3, 2005 -- Pioneer Natural Resources Company (NYSE:PXD) today
announced financial and operating results for the quarter ended March 31, 2005.

Pioneer  reported net income of $84.7 million,  or $.58 per diluted share.  This
reflects a per share increase of 16% as compared to the same period last year in
which Pioneer  reported net income of $60.2 million,  or $.50 per diluted share.
Cash flow from operations for the first quarter was $334.9 million,  an increase
of 32% compared to $253.6 million for the same period in 2004.

Long-term debt declined by $554.0 million during the quarter,  ending the period
at $1.83 billion.  During the quarter,  Pioneer sold two  volumetric  production
payments (VPP) for total proceeds of approximately  $593 million and repurchased
3.7 million shares for a total  investment of $151.9 million.  During April, the
Company  sold a third VPP for  proceeds  of  approximately  $300  million,  sold
certain U.S. assets for proceeds of approximately  $25 million and announced the
pending  sale of  non-strategic  assets  in  Canada  for  expected  proceeds  of
approximately $207 million.

Scott Sheffield,  Chairman and CEO,  stated,  "To take advantage of high oil and
gas prices,  we've sold 38 million barrels of oil equivalent  reserves through a
combination of VPP  transactions and assets sales in Canada and the U.S. for net
proceeds anticipated to exceed $1.1 billion. Opportunities to change a company's
financial  landscape  so  dramatically,  by selling  less than 4% of its assets,
don't come along very often.  While we're extremely pleased to have improved our
balance sheet and substantially enhanced our financial  flexibility,  we will be
cautious as we make  investments  in the current  environment  of high commodity
prices and rising costs to ensure attractive returns on capital employed."

First quarter oil and gas sales averaged  188,524 barrels oil equivalent per day
(BOEPD).  First  quarter  oil sales  averaged  49,111  barrels per day (BPD) and
natural gas liquids  sales  averaged  19,716 BPD. Gas sales in the first quarter
averaged 718 million cubic feet per day (MMcfpd).  First quarter realized prices
for oil and natural gas liquids were $33.27 and $26.88 per barrel, respectively.
The realized  price for gas was $5.04 per thousand  cubic feet (Mcf),  including
$.17 per Mcf  associated  with VPP deferred  revenue  amortization,  while North
American  realized gas prices  averaged  $5.96 per Mcf,  including  $.20 per Mcf
associated  with VPP deferred  revenue  amortization.  Pioneer  also  recognized
pretax income of $24.8 million associated with business  interruption  insurance
for downtime at Devils Tower and Canyon  Express as a result of damage caused by
Hurricane Ivan.

First  quarter  production  costs  averaged  $6.72 per barrel of oil  equivalent
(BOE).  Production costs increased as compared to the fourth quarter of 2004 due
to an increase in ad valorem taxes,  additional  workover  activities  performed
during Canada's winter access only season,  higher field operating costs and the
retention of operating  costs related to the VPP volumes sold.  Exploration  and
abandonment  costs were $67.4 million for the quarter and included $28.3 million
of dry hole and abandonments associated with unsuccessful wells in the deepwater
Gulf of Mexico,  Canada,  Nigeria and  Tunisia,  $37.8  million of geologic  and
geophysical  expenses  including seismic costs and $1.3 million of delay rentals
and unproved  acreage  abandonments.  General and  administrative  costs for the
quarter  were  $29.6  million,  including  annual  incentive-based   performance
payments.

For the same  quarter  last year,  Pioneer  reported  total oil and gas sales of
182,050 BOEPD,  including oil sales of 47,733 BPD,  natural gas liquids sales of
23,406 BPD and gas sales of 665 MMcfpd (excluding field fuel volumes).  Realized





prices for the 2004 first  quarter  were  $28.31 per barrel for oil,  $22.21 per
barrel for natural gas liquids and $4.38 per Mcf for gas,  while North  American
gas prices averaged $5.04 per Mcf.

Operations Update

During the quarter,  Pioneer accelerated its onshore drilling activities in each
of its core areas to accomplish its more aggressive  development plans for 2005.
Currently,  Pioneer has 17 onshore rigs running in the U.S. and ten rigs running
in Argentina.  In Canada, the Company recently completed its largest-ever winter
drilling  campaign,  drilling 56 wells.  During Canada's summer drilling season,
Pioneer  plans to drill up to 100 wells to assess the potential of its extensive
Horseshoe Canyon coalbed acreage position.

In the deepwater Gulf of Mexico,  production  from the Devils Tower A-5 well was
initiated in mid-April and the seventh of eight Devils Tower  development  wells
is currently  being  completed.  Production  was also  initiated from the Adam 3
development well in Tunisia at a gross rate of approximately 3,000 BPD.

The Company continues to expand its offshore exploration program in West Africa.
Pioneer was  awarded  acreage in Nigeria  Block 320 and is  awaiting  government
approval on Nigeria Block 256 and the potential award of two blocks in the Joint
Development  Zone between  Nigeria and the  Democratic  Republic of Sao Tome and
Principe. In the deepwater Gulf of Mexico,  Pioneer was the apparent high bidder
on 13 blocks  focused  principally  in the  Mississippi  Canyon  area  where the
Company has three producing  fields and is currently  participating in appraisal
drilling on a fourth discovery.

Pioneer has  participated in seven key exploration  wells this year and expensed
three dry holes  drilled  during the  quarter in the  deepwater  Gulf of Mexico,
Nigeria and Tunisia.  The Company participated in four wells (two in Alaska, the
Thunder  Hawk  well in the  deepwater  Gulf of  Mexico  and the  Nour-1  well in
Tunisia)  for  which  results  will  be  announced  after  further  testing  and
evaluation have been completed.

Financial Outlook

The following  statements  are estimates  based on current  expectations.  These
forward-looking  statements  are subject to a number of risks and  uncertainties
which may cause the  Company's  actual  results  to differ  materially  from the
following  statements.  The last paragraph of this release  addresses certain of
the risks and uncertainties to which the Company is subject.

Second quarter 2005  production is expected to average 185,000 to 205,000 BOEPD,
including a full quarter of production from Canyon Express, continued ramp up of
production  from Devils Tower,  typical  variability  in the timing of oil cargo
shipments  in South  Africa and Tunisia and the impact of a full  quarter of VPP
volumes sold.

Second quarter production costs (including  production and ad valorem taxes) are
expected to average  $6.25 to $6.75 per BOE based on current  NYMEX strip prices
for oil and gas. Depreciation, depletion and amortization expense is expected to
average $9.10 to $9.60 per BOE.

Total  exploration and abandonment  expense is expected to be $50 million to $70
million and includes  carryover costs  associated with  unsuccessful  wells that
were in progress at the end of the first  quarter,  plans to drill two deepwater
Gulf of Mexico exploration wells and the acquisition of additional seismic data.
General and administrative expense is expected to be $27 million to $29 million.
Interest expense is expected to be $29 million to $32 million,  and accretion of
discount  on asset  retirement  obligations  is  expected to be $2 million to $3
million.

The Company's second quarter effective income tax rate is expected to range from
36% to 39% based on current capital spending plans,  including cash income taxes
of $5 million to $10  million  that are  principally  related to  Argentine  and
Tunisian income taxes and nominal alternative minimum tax in the U.S. Other than
in Argentina and Tunisia, the Company continues to benefit from the carryforward
of net operating losses and other positive tax attributes.

The  Company's  financial  results  and oil and gas hedges are  outlined  on the
attached schedules.






Earnings Conference Call

This  morning at 10:00 a.m.  Eastern,  Pioneer  will  discuss its first  quarter
financial and operating results with an accompanying presentation. The call will
be webcast on Pioneer's  website,  www.pioneernrc.com.  At the  website,  select
'INVESTOR'  at the top of the  page.  For those  who  cannot  listen to the live
broadcast,  a replay will be available shortly after the call. Or you may choose
to dial (888)  569-5033  (confirmation  code:  6264844) to listen to the call by
telephone and view the accompanying  visual presentation at the website above. A
telephone replay will be available by dialing (888) 203-1112 (confirmation code:
6264844).

Pioneer is a large  independent oil and gas  exploration and production  company
with  operations in the United States,  Argentina,  Canada,  Equatorial  Guinea,
Nigeria,  South Africa and Tunisia.  Pioneer's  headquarters are in Dallas.  For
more information, visit Pioneer's website at www.pioneernrc.com.

Except for historical  information contained herein, the statements in this News
Release are 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 are subject to a number
of risks and  uncertainties  that may cause  Pioneer'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,  government  regulation  or  action,
international  operations  and associated  international  political and economic
instability,  litigation,  the costs and  results of  drilling  and  operations,
Pioneer'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 or terrorism. These and other risks
are  described  in Pioneer's  10-K and 10-Q  Reports and other  filings with the
Securities and Exchange Commission.









                        PIONEER NATURAL RESOURCES COMPANY
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (in thousands)



                                                                  March 31,       December 31,
                                                                    2005              2004
                                                                 -----------      ------------
                                                                 (Unaudited)
                                     ASSETS
                                                                            
Current assets:
   Cash and cash equivalents                                     $    16,039      $     7,257
   Accounts receivable, net                                          224,874          210,279
   Inventories                                                        41,256           40,332
   Prepaid expenses                                                    8,355           10,822
   Deferred income taxes                                             188,124          115,206
   Other current assets, net                                           9,213            9,529
                                                                  ----------       ----------
        Total current assets                                         487,861          393,425
                                                                  ----------       ----------
Property, plant and equipment, at cost:
   Oil and gas properties, using the successful efforts
     method of accounting                                          8,338,605        8,124,616
   Accumulated depletion, depreciation and amortization           (2,395,972)      (2,243,549)
                                                                  ----------       ----------
        Total property, plant and equipment                        5,942,633        5,881,067
                                                                  ----------       ----------
Deferred income taxes                                                  2,038            2,963
Goodwill                                                             307,951          315,880
Other assets, net                                                    141,854          135,132
                                                                  ----------       ----------
                                                                 $ 6,882,337      $ 6,728,467
                                                                  ==========       ==========

                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                              $   282,854      $   216,051
   Interest payable                                                   29,976           45,735
   Income taxes payable                                               16,295           13,520
   Deferred revenue                                                   84,469              -
   Other current liabilities                                         509,405          269,153
                                                                  ----------       ----------
        Total current liabilities                                    922,999          544,459
                                                                  ----------       ----------
Long-term debt                                                     1,831,938        2,385,950
Deferred income taxes                                                518,291          607,415
Deferred revenue                                                     545,811              -
Other liabilities and minority interests                             556,358          358,863
Stockholders' equity                                               2,506,940        2,831,780
                                                                  ----------       ----------
                                                                 $ 6,882,337      $ 6,728,467
                                                                  ==========       ==========








                        PIONEER NATURAL RESOURCES COMPANY
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                    (in thousands, except for per share data)
                                   (Unaudited)




                                                              Three months ended
                                                                    March 31,
                                                           --------------------------
                                                              2005            2004
                                                           ----------     -----------
                                                                    
Revenues and other income:
   Oil and gas                                             $  520,312     $  435,527
   Interest and other                                          28,333          1,735
   Gain (loss) on disposition of assets, net                    2,221            (13)
                                                            ---------      ---------
                                                              550,866        437,249
                                                            ---------      ---------
Costs and expenses:
   Oil and gas production                                     113,962         78,212
   Depletion, depreciation and amortization                   156,151        136,499
   Impairment of long-lived assets                                152            -
   Exploration and abandonments                                67,385         80,506
   General and administrative                                  29,585         18,329
   Accretion of discount on asset retirement obligations        2,140          1,966
   Interest                                                    33,251         21,576
   Other                                                       11,720            196
                                                            ---------      ---------
                                                              414,346        337,284
                                                            ---------      ---------
Income before income taxes                                    136,520         99,965
Income tax provision                                          (51,863)       (39,777)
                                                            ---------      ---------
Net income                                                 $   84,657     $   60,188
                                                            =========      =========

Net income per share:
   Basic                                                   $      .59     $      .51
                                                            =========      =========
   Diluted                                                 $      .58     $      .50
                                                            =========      =========

Weighted average shares outstanding:
   Basic                                                      142,898        118,719
                                                            =========      =========
   Diluted                                                    147,345        120,264
                                                            =========      =========







                        PIONEER NATURAL RESOURCES COMPANY
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                   (Unaudited)




                                                                 Three months ended
                                                                      March 31,
                                                              --------------------------
                                                                 2005           2004
                                                              ----------     -----------
                                                                       
Cash flows from operating activities:
   Net income                                                 $   84,657     $   60,188
   Depletion, depreciation and amortization                      156,151        136,499
   Impairment of long-lived assets                                   152            -
   Exploration expenses, including dry holes                      58,445         78,820
   Deferred income taxes                                          42,972         32,720
   Loss (gain) on disposition of assets, net                      (2,221)            13
   Accretion of discount on asset retirement obligations           2,140          1,966
   Noncash interest expense                                          696         (6,370)
   Commodity hedge related activity                               (3,061)       (11,392)
   Amortization of stock-based compensation                        5,152          1,979
   Amortization of deferred revenue                              (11,625)           -
   Other noncash items                                             4,678           (658)
   Changes in operating assets and liabilities, net of
     effects from acquisition:
      Accounts receivable, net                                   (12,033)       (33,737)
      Inventories                                                 (1,315)           (19)
      Prepaid expenses                                             2,449            917
      Other current assets, net                                     (198)           757
      Accounts payable                                            17,593         (6,002)
      Interest payable                                           (16,259)           693
      Income taxes payable                                         2,775          3,058
      Other current liabilities                                    3,736         (5,802)
                                                               ---------      ---------
Net cash provided by operating activities                        334,884        253,630
Net cash provided by (used in) investing activities              361,899       (172,301)
Net cash used in financing activities                           (688,202)       (91,426)
                                                               ---------      ---------
Net increase (decrease) in cash and cash equivalents               8,581        (10,097)
Effect of exchange rate changes on cash
   and cash equivalents                                              201           (180)
Cash and cash equivalents, beginning of period                     7,257         19,299
                                                               ---------      ---------
Cash and cash equivalents, end of period                      $   16,039     $    9,022
                                                               =========      =========








                        PIONEER NATURAL RESOURCES COMPANY
                        SUMMARY PRODUCTION AND PRICE DATA
                                   (Unaudited)



                                                           Three months ended
                                                                March 31,
                                                        ------------------------
                                                           2005          2004
                                                        ---------      ---------
                                                                 
Average Daily Sales Volumes:
   Oil (Bbls) -                      U.S.                  28,723         24,971
                                     Argentina              8,191          8,628
                                     Canada                   230            100
                                     Africa                11,967         14,034
                                                        ---------      ---------

                                     Total                 49,111         47,733

   Natural gas liquids (Bbls) -      U.S.                  17,543         20,936
                                     Argentina              1,572          1,424
                                     Canada                   601          1,046
                                                        ---------      ---------

                                     Total                 19,716         23,406

   Gas (Mcf) -                       U.S.                 538,285        527,630
                                     Argentina            130,351         97,818
                                     Canada                49,546         40,019
                                                        ---------      ---------

                                     Total                718,182        665,467

Total Production:
   Oil (MBbls)                                              4,420          4,344
   Natural gas liquids (MBbls)                              1,774          2,130
   Gas (MMcf)                                              64,636         60,558
   Equivalent barrels (MBOE)                               16,967         16,567

Average Reported Price (a):
   Oil (per Bbl) -                   U.S.               $   28.96      $   26.67
                                     Argentina          $   31.75      $   27.93
                                     Canada             $   53.81      $   35.00
                                     Africa             $   44.28      $   31.41
                                     Worldwide          $   33.27      $   28.31

   Natural gas liquids (per Bbl)  -  U.S.               $   26.15      $   21.52
                                     Argentina          $   30.35      $   29.16
                                     Canada             $   39.07      $   26.51
                                     Worldwide          $   26.88      $   22.21

   Gas (per Mcf) -                   U.S.               $    5.94      $    5.10
                                     Argentina          $     .88      $     .58
                                     Canada             $    6.17      $    4.22
                                     Worldwide          $    5.04      $    4.38
<FN>
- ---------------
(a) Average prices include the results of hedging activities.
</FN>







                        PIONEER NATURAL RESOURCES COMPANY
                    SUPPLEMENTAL NON-GAAP FINANCIAL MEASURES
                                 (in thousands)
                                   (Unaudited)


     EBITDAX  and  discretionary  cash  flow  ("DCF")  (as  defined  below)  are
presented herein, and reconciled to the generally accepted accounting  principle
("GAAP")  measures of net income and net cash  provided by operating  activities
because  of their wide  acceptance  by the  investment  community  as  financial
indicators of a company's ability to internally fund exploration and development
activities  and to service or incur debt.  The Company  also views the non- GAAP
measures of EBITDAX and DCF as useful  tools for  comparisons  of the  Company's
financial  indicators  with those of peer  companies  that  follow the full cost
method of accounting.  EBITDAX and DCF should not be considered as  alternatives
to net income or net cash provided by operating activities, as defined by GAAP.


                                                                 Three months ended
                                                                      March 31,
                                                               -----------------------
                                                                 2005           2004
                                                               ---------     ---------
                                                                        
   Net income                                                  $  84,657     $  60,188
   Depletion, depreciation and amortization                      156,151       136,499
   Impairment of long-lived assets                                   152           -
   Exploration and abandonments                                   67,385        80,506
   Accretion of discount on asset retirement obligations           2,140         1,966
   Interest expense                                               33,251        21,576
   Income tax provision                                           51,863        39,777
   Loss (gain) on disposition of assets, net                      (2,221)           13
   Commodity hedge related activity                               (3,061)      (11,392)
   Amortization of stock-based compensation                        5,152         1,979
   Amortization of deferred revenue                              (11,625)          -
   Other noncash items                                             4,678          (658)
                                                                --------      --------

       EBITDAX (a)                                               388,522       330,454

   Less: Cash interest expense                                   (32,555)      (27,946)
         Current income taxes                                     (8,891)       (7,057)
                                                                --------      --------

         Discretionary cash flow (b)                             347,076       295,451

   Less: Cash exploration expense                                 (8,940)       (1,686)
         Changes in operating assets and liabilities              (3,252)      (40,135)
                                                                --------      --------

   Net cash provided by operating activities                   $ 334,884     $ 253,630
                                                                ========      ========
<FN>
- -------------
(a)  "EBITDAX"   represents   earnings  before   depletion,   depreciation   and
     amortization  expense;  impairment of long-lived  assets;  exploration  and
     abandonments;  accretion  of  discount  on  asset  retirement  obligations;
     interest expense;  income taxes; gain or loss on the disposition of assets;
     commodity hedge related activity; amortization of stock-based compensation;
     amortization of deferred revenue; and other noncash items.
(b)  Discretionary cash flow equals cash flows from operating  activities before
     changes in operating  assets and  liabilities  and before cash  exploration
     expense.
</FN>








                        PIONEER NATURAL RESOURCES COMPANY

                            SUPPLEMENTAL INFORMATION
                                As of May 2, 2005

                         Open Commodity Hedge Positions
                         ------------------------------


                                                           2005
                                          -----------------------------------------
                                          Second      Third     Fourth
                                          Quarter    Quarter    Quarter      Year       2006      2007      2008
                                          --------   --------   --------   --------   -------   -------   -------
                                                                                     

Average Daily Oil Production Hedged:
   Swap Contracts:
   Volume (Bbl)                             27,000     27,000     27,000     27,000    10,000    13,000    17,000
   NYMEX price (Bbl)                      $  27.97   $  27.97   $  27.97   $  27.97   $ 31.69   $ 30.89   $ 29.21
   Collar Contracts:
   Volume (Bbl)                                -          -          -          -       3,500       -         -
   NYMEX price (Bbl)
       Ceiling                            $    -     $    -     $    -     $    -     $ 41.95   $   -     $   -
       Floor                              $    -     $    -     $    -     $    -     $ 35.00   $   -     $   -

Average Daily Gas Production Hedged:
   Swap Contracts:
   Volume (Mcf)                            282,240    283,422    253,535    273,032    73,842    29,195     5,000
   NYMEX price (MMBtu) (a)                $   5.20   $   5.20   $   5.20   $   5.20   $  4.30   $  4.30   $  5.40
   Collar Contracts:
   Volume (Mcf)                                -          -          -          -      17,329       -         -
   NYMEX price (MMBtu)
       Ceiling                            $    -     $    -     $    -     $    -     $  9.15   $   -     $   -
       Floor                              $    -     $    -     $    -     $    -     $  6.65   $   -     $   -

<FN>
- ---------------
(a) Approximate, based on historical differentials to index prices.
</FN>



  Amortization of Volumetric Production Payment Proceeds and Derivative Losses
  ----------------------------------------------------------------------------
                                 (in thousands)



                                                    2005
                                     -------------------------------------
                                     Second    Third     Fourth
                                     Quarter   Quarter   Quarter    Year        2006   Thereafter    Total
                                     -------   -------   -------   -------   --------  ----------  --------
                                                                              
VPP proceeds, net of
   transaction costs                 $19,685   $21,126   $21,061   $61,872   $184,103   $635,608   $881,583
Net hedge obligations assigned           765       756       757     2,278      6,248     28,973     37,499
                                      ------    ------    ------    ------    -------    -------    -------
Total deferred revenue (a)            20,450    21,882    21,818    64,150    190,351    664,581    919,082
Less net derivative losses to be
   recognized in pretax earnings (b)  (5,370)   (1,043)   (2,307)   (8,720)    (4,860)   (19,921)   (33,501)
                                     -------    ------    ------    ------    -------    -------    -------
Total VPP impact to pretax
    earnings                         $15,080   $20,839   $19,511   $55,430   $185,491   $644,660   $885,581
                                      ======    ======    ======    ======    =======    =======    =======
<FN>
- --------------
(a)  Deferred  revenue  will be  amortized  as increases to oil and gas revenues
     during the indicated future periods.
(b)  Represents the remaining pretax earnings impact of the derivatives assigned
     in the VPPs.
</FN>