EXHIBIT 99.1

                                  NEWS RELEASE

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

                   Pioneer Reports Second Quarter 2005 Results

Dallas,  Texas,  August 2, 2005 -- Pioneer Natural Resources Company  (NYSE:PXD)
today announced  financial and operating  results for the quarter ended June 30,
2005.

Pioneer  reported  net income for the  quarter of $185.6  million,  or $1.28 per
diluted share, an increase of 166% over net income for the same period last year
of $69.7 million,  or $.58 per diluted share.  Cash flow from operations for the
second quarter was $332.6 million, an increase of 26% compared to $264.7 million
for the same period in 2004. The significant  increase in operating cash flow is
attributable  to higher  realized  prices for oil,  gas and  natural gas liquids
offset partially by increases in costs. Cash flow from operations, proceeds from
the  Company'  sale of its  third  volumetric  production  payment  in April and
proceeds from asset  divestitures  during the second quarter  allowed Pioneer to
reduce its long-term  debt by $437 million and  repurchase 2.1 million shares of
its common  stock  during the quarter in addition to funding its second  quarter
capital  program.  At the end of the quarter,  long-term debt was  approximately
$1.4 billion,  or 35% of total  capitalization,  and shares outstanding  totaled
141.9 million.

Net income for the quarter  includes $44.1 million ($28.0 million net of tax) of
other income which  represents  expected  proceeds  from  business  interruption
insurance claims related to previously disclosed losses sustained as a result of
Hurricane  Ivan and a fire at one of  Pioneer's  domestic  onshore  gas  plants.
Second  quarter  net  income  was  reduced by a $27.3  million  reversal  of the
deferred tax benefit recorded in connection with the Company's  decision to exit
Gabon.  The  deferred  tax benefit is being  reversed  as a result of  Pioneer's
agreement in June of 2005 to sell its interest in its Gabon subsidiary.

In May, the Company sold its  interests in three  non-core  fields in Canada and
has reflected  the results of  operations of these fields,  the gain on the sale
and the related tax effects as income from discontinued operations in the amount
of $82.0 million.  Income from continuing  operations for the quarter was $103.5
million,  or $.72 per diluted  share,  and  compares  to income from  continuing
operations of $64.2 million, or $.53 per diluted share, for the same period last
year.

Second quarter oil and gas sales averaged 183,298 barrels oil equivalent per day
(BOEPD)  excluding   approximately  2,100  BOEPD  associated  with  discontinued
operations.  Second quarter oil sales averaged  44,882 barrels per day (BPD) and
natural gas liquids sales  averaged  17,466 BPD. Gas sales in the second quarter
averaged 726 million cubic feet per day (MMcfpd). Second quarter realized prices
for oil and natural gas liquids were $35.52 and $29.11 per barrel, respectively.
The worldwide  realized  price for gas was $5.35 per thousand  cubic feet (Mcf),
including  $.30 per Mcf  associated  with the VPP  transactions.  North American
realized gas prices  averaged  $6.37 per Mcf,  including $.37 per Mcf associated
with the VPP transactions.

Second  quarter  production  costs  averaged  $6.47 per barrel of oil equivalent
(BOE).  Exploration and abandonment costs were $52.4 million for the quarter and
included $18.2 million of dry hole and abandonments associated with unsuccessful
wells in the U.S., Argentina,  Canada and Tunisia, $28.4 million of geologic and
geophysical  expenses  including seismic costs and $5.8 million of delay rentals
and unproved  acreage  abandonments.  General and  administrative  costs for the
quarter were $29.2 million.

For the same quarter  last year,  adjusted to exclude  discontinued  operations,
Pioneer  reported  oil and gas sales of 180,404  BOEPD,  including  oil sales of
44,811 BPD, natural gas liquids sales of 21,708 BPD and gas sales of 683 MMcfpd.
Realized  prices for second quarter 2004 were $27.92 per barrel for oil,  $22.73
per barrel for natural gas liquids and $4.28 per Mcf for gas. North American gas
prices averaged $5.07 per Mcf.






Operations Update

Pioneer has increased its 2005 capital budget for  development  and  exploratory
activities and land additions by approximately $150 million to $1.1 billion. The
increase encompasses  expenditures related to Pioneer's success in extending its
acreage  positions  in West  Africa,  the U.S.  onshore  Gulf  Coast,  the Rocky
Mountains,  Alaska and  Canada,  adding a 5-well  Gulf of Mexico  shallow  shelf
exploration  program and an increase in drilling in the Spraberry  field and the
Horseshoe  Canyon  coalbed  methane play in Canada.  The  increased  budget also
reflects the rising costs  associated  with drilling and  completion  activities
given higher commodity prices. The capital budget excludes costs associated with
recent acquisitions.

During  the  second  quarter,  Pioneer  continued  with the  aggressive  pace of
development set earlier in the year. Currently,  the Company has 16 onshore rigs
running in the U.S., nine in Argentina and five in Canada.

In the Raton  Basin,  Pioneer has  drilled 135 of the 300 wells  planned by year
end. The Company is scheduled to drill 30 to 40 wells per month  through the end
of the year given that each  year's  drilling  schedule  is  back-end  loaded to
accommodate   typical  winter  weather   delays.   During  the  second  quarter,
third-party  pipeline capacity  restraints began limiting  Pioneer's  production
from the field and are  expected to continue to have an impact  until a pipeline
expansion of  approximately  35% is  completed in October of 2005.  As a result,
Raton production in 2005 is now expected to be 5% to 7% above 2004 levels.

In the  deepwater  Gulf of Mexico,  exploration  drilling on  Pioneer's  Clipper
prospect  has  resumed  after  having  been  suspended  for severe  weather  and
recurring loop  currents.  Pioneer also expects to use the rig that it has under
contract on the Clipper  prospect  to drill its  Paladin  prospect  later in the
year.  During the fourth  quarter,  an appraisal  well is planned on the Thunder
Hawk discovery.

The ramp-up of production  from the Devils Tower field has also been impacted by
severe weather. In addition, production from Devils Tower's deepest intervals is
being  extended,  increasing  recoverable  reserves,  but  postponing  access to
shallower  intervals  that are  expected to produce at higher  rates.  Plans for
tying in two satellite  fields,  Triton and Goldfinger,  are progressing  toward
completion during the fourth quarter.

In July,  recoverable reserves from the Harrier field were fully produced,  with
ultimate  recoverable  reserves  exceeding  expectations.  Pioneer has also been
advised by the operator of the Canyon Express  system that sidetrack  operations
planned for the  Aconcagua  field later this year will be postponed  pending rig
availability.  The  existing  Aconcagua  wells are  expected to reach the end of
their productive lives by the end of 2005 or early 2006; therefore,  Pioneer now
anticipates  that the system will be shut-in  once the Camden  Hill  recoverable
reserves are fully  produced  during the first half of 2006 unless a rig becomes
available to drill the Aconcagua sidetrack wells.

In Canada,  Pioneer has drilled 30 wells in the Horseshoe Canyon coalbed methane
play under a program to drill up to 100 wells  during 2005.  Initial  stabilized
flow  rates  have  significantly  exceeded  expectations,  and  the  Company  is
considering an expansion of this program.  Two Manville  coalbed  methane pilots
are also planned in the Bashaw area later this year.

The  Company  continues  to expand  its  deepwater  exploration  program in West
Africa.  Pioneer was awarded  exploration rights to acreage in Blocks 2 and 3 in
the Joint  Development  Zone between Nigeria and Sao Tome and Principe through a
consortium  with ERHC Energy Inc.  The  consortium  was awarded 65%  interest in
Block 2 and 25%  interest  in Block 3 subject to  negotiating  acceptable  joint
operating and production sharing agreements.

As announced  yesterday,  Pioneer is also  expanding its portfolio in Alaska and
has joined  ConocoPhillips in the Cosmopolitan Unit located offshore in the Cook
Inlet  where  three  wells and a  sidetrack  have been  drilled  establishing  a
significant oil column.  A new 3-D seismic survey is planned for later this year
to refine the estimate of recoverable reserves.








Scott D. Sheffield, Chairman and CEO, stated, "Pioneer delivered another quarter
of strong financial and operational performance, reflecting recent robust market
conditions and our quality portfolio of producing assets. Since the beginning of
this  year,  we have  reduced  long-term  debt by $1 billion  and  substantially
improved our financial flexibility. With this enhanced financial flexibility, we
expect to  continue to add net asset  value and grow  production  on a per share
basis through an aggressive  development drilling program, the commercialization
of several attractive  discovered  resources,  core area  acquisitions,  further
exploration success and additional share repurchases."

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.

Full-year  production  is now  expected  to range  from 63 MMBOE to 65 MMBOE for
2005, excluding production from discontinued operations.  The new range reflects
the  production  impact of closed and pending asset sales in Canada,  East Texas
and the inland  waters of the Gulf of Mexico,  the  Company's  third  volumetric
production payment  transaction,  production lost from the Devils Tower and West
Panhandle fields which were covered by business interruption insurance, pipeline
capacity limitations delaying the ramp up of production from the Raton Basin and
the impact of weather and rig shortages in the deepwater Gulf of Mexico, most of
which are discussed in the operations  update above. The new range also reflects
the impact of directives  from the Minerals  Management  Service which  required
that uphole  recompletions  scheduled  for Devils  Tower wells be  postponed  to
maximize the recovery of oil and gas from less prolific deeper zones.

Third quarter 2005  production is expected to average  160,000 to 175,000 BOEPD.
This range is lower than the second  quarter  average and  reflects  the Harrier
field having been fully  produced,  the  resumption of production  from the West
Panhandle  field in mid-July  and the typical  variability  in the timing of oil
cargo shipments in South Africa, Argentina and Tunisia.

Third quarter  production costs (including  production and ad valorem taxes) are
expected to average  $6.75 to $7.25 per BOE based on current  NYMEX strip prices
for oil and gas. The increase  over the prior quarter is primarily the result of
lower  anticipated  third  quarter  production  from lower per unit cost Gulf of
Mexico fields, higher commodity prices, and to a lesser extent, the retention of
a full quarter of operating costs  associated with the third VPP volumes sold in
April.  Depreciation,  depletion and amortization expense is expected to average
$8.75 to $9.25 per BOE.

Total  exploration and abandonment  expense is expected to be $40 million to $70
million and includes  plans to drill two  deepwater  Gulf of Mexico  exploration
wells (Clipper and Paladin) and one well in the Anaguid Block in Tunisia and the
acquisition of additional 3-D seismic data. General and  administrative  expense
is expected to be $28 million to $30 million. Interest expense is expected to be
$26 million to $29  million,  and  accretion  of  discount  on asset  retirement
obligations is expected to be $2 million to $3 million.

The Company's third quarter  effective income tax rate is expected to range from
36% to 39% based on current capital spending plans,  including cash income taxes
of $10  million  to $20  million  that are  principally  related  to  Argentine,
Canadian and Tunisian  income taxes and nominal  alternative  minimum tax in the
U.S.  Other than in  Argentina,  Canada 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 second  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 (800)  474-8920  (confirmation  code:  5477131) 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:
5477131).

Pioneer is a large  independent oil and gas  exploration and production  company
with  operations in the United States,  Argentina,  Canada,  Equatorial  Guinea,
Nigeria, Sao Tome and Principe, 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  which 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,
availability  of  drilling  equipment,  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)




                                                              June 30,      December 31,
                                                                2005            2004
                                                            -----------     -----------
                                                            (Unaudited)
                                     ASSETS
                                                                      
Current assets:
   Cash and cash equivalents                                $    58,451     $     7,257
   Accounts receivable, net                                     265,191         210,279
   Inventories                                                   56,282          40,332
   Prepaid expenses                                               5,015          10,822
   Deferred income taxes                                        151,316         115,206
   Other current assets, net                                      8,621           9,529
                                                             ----------      ----------

        Total current assets                                    544,876         393,425
                                                             ----------      ----------
Property, plant and equipment, at cost:
   Oil and gas properties, using the successful efforts
     method of accounting                                     8,317,180       8,124,616
   Accumulated depletion, depreciation and amortization      (2,399,542)     (2,243,549)
                                                             ----------      ----------
        Total property, plant and equipment                   5,917,638       5,881,067
                                                             ----------      ----------
Deferred income taxes                                               -             2,963
Goodwill                                                        307,068         315,880
Other assets, net                                               144,995         135,132
                                                             ----------      ----------
                                                            $ 6,914,577     $ 6,728,467
                                                             ==========      ==========

                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                         $   273,484     $   216,051
   Interest payable                                              42,682          45,735
   Income taxes payable                                          25,439          13,520
   Deferred revenue                                             139,544             -
   Other current liabilities                                    403,932         269,153
                                                             ----------      ----------
        Total current liabilities                               885,081         544,459
                                                             ----------      ----------
Long-term debt                                                1,394,739       2,385,950
Deferred income taxes                                           653,593         607,415
Deferred revenue                                                759,070             -
Other liabilities and minority interests                        576,461         358,863
Stockholders' equity                                          2,645,633       2,831,780
                                                             ----------      ----------
                                                            $ 6,914,577     $ 6,728,467
                                                             ==========      ==========








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


                                                   Three months ended         Six months ended
                                                        June 30,                  June 30,
                                                -----------------------   ----------------------
                                                   2005          2004         2005        2004
                                                ----------   ----------   ----------   ---------
                                                                              
Revenues and other income:
   Oil and gas                                  $  544,600   $  424,757   $1,054,642   $ 850,427
   Interest and other                               47,896        1,610       76,229       3,345
   Gain (loss) on disposition of assets, net           148         (232)       2,369        (245)
                                                 ---------    ---------    ---------    --------
                                                   592,644      426,135    1,133,240     853,527
                                                 ---------    ---------    ---------    --------
Costs and expenses:
   Oil and gas production                          107,996       81,177      219,494     155,878
   Depletion, depreciation and amortization        147,161      140,528      300,758     274,717
   Impairment of long-lived assets                     471          -            623         -
   Exploration and abandonments                     52,384       39,605      119,473     119,351
   General and administrative                       29,217       17,140       58,802      35,415
   Accretion of discount on asset retirement
      obligations                                    2,102        2,016        4,242       3,982
   Interest                                         30,212       21,402       63,463      42,978
   Other                                            17,582        8,300       29,302       8,496
                                                 ---------    ---------    ---------    --------
                                                   387,125      310,168      796,157     640,817
                                                 ---------    ---------    ---------    --------
Income from continuing operations before
   income taxes                                    205,519      115,967      337,083     212,710
Income tax provision                              (101,983)     (51,759)    (153,846)    (91,536)
                                                 ---------    ---------    ---------    --------
Income from continuing operations                  103,536       64,208      183,237     121,174
Income from discontinued operations,
   net of tax                                       82,023        5,494       86,979       8,716
                                                 ---------    ---------    ---------    --------
Net income                                      $  185,559   $   69,702   $  270,216   $ 129,890
                                                 =========    =========    =========    ========
Basic earnings per share:
   Income from continuing operations            $      .74   $      .54   $     1.29   $    1.02
   Income from discontinued
      operations, net of tax                           .58          .05          .61         .07
                                                 ---------    ---------    ---------    --------
   Net income                                   $     1.32   $      .59   $     1.90   $    1.09
                                                 =========    =========    =========    ========
Diluted earnings per share:
   Income from continuing operations            $      .72   $      .53   $     1.26   $    1.01
   Income from discontinued
      operations, net of tax                           .56          .05          .60         .07
                                                 ---------    ---------    ---------    --------
   Net income                                   $     1.28   $      .58   $     1.86   $    1.08
                                                 =========    =========    =========    ========
Weighted average shares outstanding:
   Basic                                           140,812      118,855      141,849     118,787
                                                 =========    =========    =========    ========
   Diluted                                         145,246      120,402      146,286     120,333
                                                 =========    =========    =========    ========







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



                                                        Three months ended          Six months ended
                                                             June 30,                   June 30,
                                                     -----------------------   ------------------------
                                                        2005         2004          2005          2004
                                                     ----------   ----------   -----------   ----------
                                                                                 
Cash flows from operating activities:
   Net income                                        $  185,559   $   69,702   $   270,216   $  129,890
   Depletion, depreciation and amortization             147,161      140,528       300,758      274,717
   Impairment of long-lived assets                          471            -           623          -
   Exploration expenses, including dry holes             44,007       33,380       102,156      111,440
   Deferred income taxes                                 86,434       47,144       129,406       79,864
   Loss (gain) on disposition of assets, net               (148)         232        (2,369)         245
   Accretion of discount on asset retirement
      obligations                                         2,102        2,016         4,242        3,982
   Noncash effects from discontinued operations         (79,646)       2,300       (76,796)       5,370
   Noncash interest expense                               1,676       (4,993)        2,372      (11,363)
   Commodity hedge related activity                      (7,666)     (11,242)      (10,727)     (22,533)
   Amortization of stock-based compensation               8,018        2,887        13,170        4,866
   Amortization of deferred revenue                     (20,449)         -         (32,074)         -
   Other noncash items                                   12,086        6,463        16,764        5,704
   Changes in operating assets and liabilities,
     net of effects from acquisition:
      Accounts receivable, net                          (42,269)     (24,803)      (54,302)     (58,540)
      Inventories                                       (11,388)      (4,161)      (12,703)      (4,180)
      Prepaid expenses                                    3,359        3,930         5,808        4,847
      Other current assets, net                           (331)          -            (529)         757
      Accounts payable                                   (8,029)       1,248         9,564       (4,754)
      Interest payable                                   11,895         (607)       (4,364)          86
      Income taxes payable                                9,144        1,397        11,919        4,455
      Other current liabilities                          (9,425)        (717)       (5,689)      (6,519)
                                                      ---------    ---------    ----------    ---------

Net cash provided by operating activities               332,561      264,704       667,445      518,334
Net cash provided by (used in) investing activities     243,455     (192,233)      605,354     (364,534)
Net cash used in financing activities                  (536,165)     (66,108)   (1,224,367)    (157,534)
                                                      ---------    ---------    ----------    ---------

Net increase (decrease) in cash and cash equivalents     39,851        6,363        48,432       (3,734)
Effect of exchange rate changes on cash
   and cash equivalents                                   2,561         (173)        2,762         (353)
Cash and cash equivalents, beginning
   of period                                             16,039        9,022         7,257       19,299
                                                      ---------    ---------    ----------    ---------

Cash and cash equivalents, end of period             $   58,451    $  15,212   $    58,451   $   15,212
                                                      =========     ========    ==========    =========








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



                                                 Three months ended     Six months ended
                                                      June 30,              June 30,
                                                -------------------   --------------------
                                                  2005       2004       2005        2004
                                                --------   --------   --------   ---------
                                                                     
Average Daily Sales Volumes
  from Continuing Operations:
   Oil (Bbls) -                     U.S.          26,424     26,039     27,567     25,505
                                    Argentina      7,796      8,531      7,992      8,579
                                    Canada           210         26        186         28
                                    Africa        10,452     10,215     11,205     12,125
                                                --------   --------   --------   --------
                                    Worldwide     44,882     44,811     46,950     46,237
                                                ========   ========   ========   ========

   Natural gas liquids (Bbls) -     U.S.          14,908     19,809     16,219     20,373
                                    Argentina      1,948      1,494      1,761      1,459
                                    Canada           610        405        514        432
                                                --------   ---------  --------   --------
                                    Worldwide     17,466     21,708     18,494     22,264
                                                ========   ========   ========   ========

   Gas (Mcf) -                      U.S.         553,803    536,109    546,086    531,870
                                    Argentina    135,188    122,326    132,783    110,072
                                    Canada        36,710     24,868     35,448     24,420
                                                --------   --------   --------   --------
                                    Worldwide    725,701    683,303    714,317    666,362
                                                ========   ========   ========   ========

Average Daily Sales Volumes
  from Discontinued Operations:
   Oil (Bbls) -                     Canada            45         69         57         69
   Natural gas liquids (Bbls) -     Canada           264        511        224        549
   Gas (Mcf) -                      Canada        10,472     16,425     12,910     16,236

Average Reported Prices (a):
   Oil (per Bbl) -                  U.S.        $  29.36   $  27.63   $  29.15   $  27.16
                                    Argentina   $  34.54   $  20.13   $  33.12   $  24.05
                                    Canada      $  35.22   $  45.79   $  41.97   $  45.54
                                    Africa      $  51.84   $  35.13   $  47.82   $  32.98
                                    Worldwide   $  35.52   $  27.92   $  34.33   $  28.12

   Natural gas liquids (per Bbl) -  U.S.        $  28.39   $  22.29   $  27.18   $  21.90
                                    Argentina   $  30.84   $  27.22   $  30.62   $  28.17
                                    Canada      $  41.18   $  27.31   $  39.89   $  27.53
                                    Worldwide   $  29.11   $  22.73   $  27.86   $  22.42

   Gas (per Mcf) -                  U.S.        $   6.39   $   5.15   $   6.17   $   5.13
                                    Argentina   $    .88   $    .65   $    .88   $    .62
                                    Canada      $   6.17   $   3.35   $   6.07   $   3.30
                                    Worldwide   $   5.35   $   4.28   $   5.18   $   4.31
<FN>
- ---------------
(a)  Average prices are  attributable  to continuing  operations and 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       Six months ended
                                                            June 30,                 June 30,
                                                     ---------------------   ---------------------
                                                        2005       2004         2005        2004
                                                     ---------   ---------   ---------   ---------

                                                                             
   Net income                                        $ 185,559   $  69,702   $ 270,216   $ 129,890
   Depletion, depreciation and amortization            147,161     140,528     300,758     274,717
   Impairment of long-lived assets                         471         -           623         -
   Exploration and abandonments                         52,384      39,605     119,473     119,351
   Accretion of discount on asset retirement
      obligations                                        2,102       2,016       4,242       3,982
   Interest expense                                     30,212      21,402      63,463      42,978
   Income tax provision                                101,983      51,759     153,846      91,536
   Loss (gain) on disposition of assets, net              (148)        232      (2,369)        245
   Noncash effects from discontinued operations        (79,646)      2,300     (76,796)      5,370
   Current income taxes on discontinued operations       2,869         -         2,869         -
   Commodity hedge related activity                     (7,666)    (11,242)    (10,727)    (22,533)
   Amortization of stock-based compensation              8,018       2,887      13,170       4,866
   Amortization of deferred revenue                    (20,449)        -       (32,074)        -
   Other noncash items                                  12,086       6,463      16,764       5,704
                                                      --------    --------    --------    --------
      EBITDAX (a)                                      434,936     325,652     823,458     656,106

   Less:  Cash interest expense                        (28,536)    (26,395)    (61,091)    (54,341)
          Current income taxes                         (18,418)     (4,615)    (27,309)    (11,672)
                                                      --------    --------    --------    --------
          Discretionary cash flow (b)                  387,982     294,642     735,058     590,093

   Less:  Cash exploration expense                      (8,377)     (6,225)    (17,317)     (7,911)
          Changes in operating assets and liabilities  (47,044)    (23,713)    (50,296)    (63,848)
                                                      --------    --------    --------    --------
   Net cash provided by operating activities         $ 332,561   $ 264,704   $ 667,445   $ 518,334
                                                      ========    ========    ========    ========
<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;
     noncash  effects from  discontinued  operations;  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 August 1, 2005


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




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

                                                                       
Average Daily Oil Production Hedged:
     Swap Contracts:
     Volume (Bbl)                           27,000     27,000     10,000     13,000     17,000
     NYMEX price (Bbl)                    $  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 (MMBtu)                        283,422    253,535     73,842     29,195      5,000
     NYMEX price (MMBtu) (a)              $   5.20   $   5.20   $   4.30   $   4.30   $   5.40
     Collar Contracts:
     Volume (MMBtu)                           -          -        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 Net Derivative Losses
- --------------------------------------------------------------------------------
                                 (in thousands)




                                            2005
                                     ------------------
                                      Third     Fourth
                                     Quarter    Quarter      2006    Thereafter     Total
                                     --------   --------   -------   ----------   --------
                                                                   
VPP proceeds, net of
   transaction costs                 $ 21,126   $ 21,061   $184,099   $635,594    $861,880
Net hedge obligations assigned            756        757      6,248     28,973      36,734
                                      -------    -------    -------    -------     -------
Total deferred revenue (a)             21,882     21,818    190,347    664,567     898,614
Less net derivative losses to be
   recognized in pretax earnings (b)   (1,043)    (2,307)    (4,860)   (20,657)    (28,867)
                                      -------    -------    -------   --------     -------
Total VPP impact to pretax
   earnings                          $ 20,839   $ 19,511   $185,487   $643,910    $869,747
                                      =======    =======    =======    =======     =======
<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>