PARKER & PARSLEY 90-C CONV LP
10-K405, 1998-03-27
CRUDE PETROLEUM & NATURAL GAS
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D. C. 20549

                                    FORM 10-K

   / x /          Annual Report Pursuant to Section 13 or 15(d)
              of the Securities Exchange Act of 1934 (Fee Required)

                   For the fiscal year ended December 31, 1997

                                       or
   /   /       Transition Report Pursuant to Section 13 or 15(d)
            of the Securities Exchange Act of 1934 (No Fee Required)

                         Commission File No. 33-26097-10

                        PARKER & PARSLEY 90-C CONV., L.P.
             (Exact name of Registrant as specified in its charter)

               Delaware                                    75-2347264
   (State or other jurisdiction of                      (I.R.S. Employer
    incorporation or organization)                    Identification Number)

303 West Wall, Suite 101, Midland, Texas                      79701
(Address of principal executive offices)                    (Zip code)

       Registrant's Telephone Number, including area code : (915) 683-4768
        Securities registered pursuant to Section 12(b) of the Act: None
           Securities registered pursuant to Section 12(g) of the Act:
                 Limited partnership interests ($1,000 per unit)

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  Registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes / x / No / /

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of Registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. / x /

No  market  currently  exists  for  the  limited  partnership  interests  of the
Registrant.  Based on original  purchase  price the  aggregate  market  value of
limited  partnership  interests  owned by  non-affiliates  of the  Registrant is
$7,501,000.

             As of March 9, 1998, the number of outstanding limited
          partnership interests was 7,531. The following documents are
               incorporated by reference into the indicated parts
                    of this Annual Report on Form 10-K: None



<PAGE>



Parts I and II of this Report contain  forward  looking  statements that involve
risks and uncertainties. Accordingly, no assurances can be given that the actual
events and results will not be materially different than the anticipated results
described  in the  forward  looking  statements.  See "Item 1.  Business"  for a
description of various factors that could  materially  affect the ability of the
Partnership to achieve the anticipated  results described in the forward looking
statements.

                                     PART I

ITEM 1.     Business

Parker & Parsley 90-C Conv., L.P. (the  "Partnership") is a general  partnership
organized  in 1990  under  the  laws of the  State  of  Texas.  The  Partnership
converted to a Delaware  limited  partnership on August 1, 1991. As of August 8,
1997,  Pioneer Natural  Resources USA, Inc.  ("Pioneer USA") became the managing
general partner of the Partnership.  Prior to August 8, 1997, the  Partnership's
managing  general partner was Parker & Parsley  Development  L.P.  ("PPDLP"),  a
wholly-owned  subsidiary  of  Parker &  Parsley  Petroleum  Company  ("Parker  &
Parsley").  On August 7, 1997,  Parker & Parsley and Mesa Inc. ("Mesa") received
shareholder  approval  to merge and create  Pioneer  Natural  Resources  Company
("Pioneer").  On August 8, 1997,  PPDLP was merged with and into  Pioneer USA, a
wholly-owned  subsidiary  of  Pioneer,  resulting  in Pioneer USA  becoming  the
managing general partner of the Partnership as PPDLP's successor by merger.  For
a more  complete  description  of the  Parker &  Parsley  and Mesa  merger,  see
Pioneer's  Registration  Statement  on Form S-4 as filed with the  Securities  &
Exchange Commission.

A Registration  Statement,  as amended,  filed pursuant to the Securities Act of
1933,  registering general partnership  interests  aggregating  $30,000,000 in a
series of Texas  general  partnerships  formed under the Parker & Parsley  89-90
Development  Drilling  Program,  was declared  effective by the  Securities  and
Exchange  Commission  on August 1, 1989.  On December 28, 1990,  the offering of
general partnership  interests in the Partnership,  the fifth partnership formed
under such  registration  statement,  was  closed,  with  interests  aggregating
$7,531,000 being sold to 517 subscribers.

The Partnership  engages primarily in oil and gas development and production and
is not  involved in any  industry  segment  other than oil and gas. See "Item 6.
Selected  Financial  Data" and "Item 8. Financial  Statements and  Supplementary
Data" of this report for a summary of the  Partnership's  operating  information
and identifiable assets.

The principal  markets during 1997 for the oil produced by the Partnership  were
refineries  and  oil  transmission  companies  that  have  facilities  near  the
Partnership's   oil  producing   properties.   The  principal  markets  for  the
Partnership's   gas  were  companies  that  have  pipelines   located  near  the
Partnership's gas producing  properties.  Of the Partnership's total oil and gas
revenues for 1997,  approximately 69% and 12% were attributable to sales made to
Genesis Crude Oil, L.P. and Western Gas Resources, Inc., respectively.

                                        2

<PAGE>



The Partnership's revenues,  profitability,  cash flow and future rate of growth
are highly dependent on the prevailing prices of oil and gas, which are affected
by  numerous  factors  beyond  the  Partnership's  control.  Oil and gas  prices
historically  have been very volatile.  A substantial or extended decline in the
prices of oil or gas could have a material adverse effect on the Partnership's

revenues,  profitability and cash flow and could,  under certain  circumstances,
result in a reduction in the  carrying  value of the  Partnership's  oil and gas
properties.

Because of the demand for oil and gas, the Partnership does not believe that the
termination  of the  sales of its  products  to any one  customer  would  have a
material adverse impact on its operations. The loss of a particular customer for
gas may have an effect if that  particular  customer  has the only gas  pipeline
located  in the  areas  of  the  Partnership's  gas  producing  properties.  The
Partnership  believes,  however,  that  the  effect  would be  temporary,  until
alternative arrangements could be made.

Federal and state  regulation of oil and gas operations  generally  includes the
fixing of maximum prices for regulated categories of natural gas, the imposition
of maximum  allowable  production rates, the taxation of income and other items,
and the protection of the  environment.  Although the Partnership  believes that
its business operations do not impair  environmental  quality and that its costs
of complying with any  applicable  environmental  regulations  are not currently
significant,   the  Partnership  cannot  predict  what,  if  any,  effect  these
environmental regulations may have on its current or future operations.

The  Partnership  does not have any  employees  of its own.  Pioneer USA employs
1,133 persons, many of whom dedicated a part of their time to the conduct of the
Partnership's business during the period for which this report is filed. Pioneer
USA is responsible for all management functions.

Numerous  uncertainties  exist in estimating  quantities of proved  reserves and
future net revenues  therefrom.  The  estimates  of proved  reserves and related
future net revenues  set forth in this report are based on various  assumptions,
which may ultimately  prove to be inaccurate.  Therefore,  such estimates should
not be construed as estimates of the current  market value of the  Partnership's
proved reserves.

No material part of the  Partnership's  business is seasonal and the Partnership
conducts no foreign operations.

ITEM 2.     Properties

The  Partnership's  properties  consist  primarily  of  leasehold  interests  in
properties on which oil and gas wells are located.  Such property  interests are
often subject to landowner royalties, overriding royalties and other oil and gas
leasehold interests.

                                        3

<PAGE>



Fractional  working  interests in  developmental  oil and gas prospects  located
primarily  in the  Spraberry  Trend  Area of West  Texas  were  acquired  by the
Partnership,  resulting in the Partnership's participation in the drilling of 44
oil and gas  wells.  One well was  sold in 1996  and one  well was  plugged  and
abandoned in 1995 due to  uneconomical  operations.  At December  31, 1997,  the
Partnership had 42 producing oil and gas wells.

For  information  relating  to the  Partnership's  estimated  proved oil and gas
reserves at December 31, 1997,  1996 and 1995 and changes in such quantities for
the years then ended,  see Note 7 of Notes to Financial  Statements  included in
"Item 8. Financial  Statements and Supplementary Data" below. Such reserves have
been  estimated  by the  engineering  staff of  Pioneer  USA with a review by an
independent petroleum consultant.

ITEM 3.     Legal Proceedings

The  Partnership  is a party to  various  legal  proceedings  incidental  to its
business  involving claims in oil and gas leases or interests,  other claims for
damages in amounts not in excess of 10% of its current assets and other matters,
none of which Pioneer believes to be material.

ITEM 4.     Submission of Matters to a Vote of Security Holders

There were no matters  submitted to a vote of security holders during the fourth
quarter of 1997.

                                        4

<PAGE>


                                     PART II

ITEM 5.     Market for Partnership's Common Equity and Related Stockholder
              Matters

At March 9, 1998, the  Partnership  had 7,531  outstanding  limited  partnership
interests  held of record by 508  subscribers.  There is no  established  public
trading  market  for  the  limited  partnership  interests.  Under  the  limited
partnership  agreement,  Pioneer USA has made  certain  commitments  to purchase
partnership interests at a computed value.

Revenues which, in the sole judgement of the managing general  partner,  are not
required to meet the  Partnership's  obligations are distributed to the partners
at least quarterly in accordance with the limited partnership agreement.  During
the years ended December 31, 1997 and 1996, $357,952 and $391,466, respectively,
of such revenue-related distributions were made to the limited partners.

ITEM 6.     Selected Financial Data

The  following  table sets forth  selected  financial  data for the years  ended
December 31:
<TABLE>
                                1997        1996         1995         1994         1993
                             ----------  ----------   ----------   ----------   -----=----
<S>                          <C>         <C>          <C>          <C>          <C>
Operating results:
  Oil and gas sales          $  661,475  $  837,849   $  722,324   $  804,039   $  979,064
                              =========   =========    =========    =========    =========
  Impairment of oil and
     gas properties          $   79,288  $      -     $   48,088   $      -     $  885,676
                              =========   =========    =========    =========    =========
  Net income (loss)          $  105,740  $  359,349   $  163,626   $  152,612   $ (853,243)
                              =========   =========    =========    =========    =========
  Allocation of net income
     (loss):
       Managing general
        partner              $    1,057  $    3,593   $    1,668   $    1,558   $   (8,501)
                              =========   =========    =========    =========    =========
       Limited partners      $  104,683  $  355,756   $  161,958   $  151,054   $ (844,742)
                              =========   =========    =========    =========    =========
  Limited partners' net
     income (loss) per
     limited partnership
     interest                $    13.90  $    47.24   $    21.51   $    20.06   $  (112.17)
                              =========   =========    =========    =========    =========
  Limited partners' cash
     distributions per
     limited partnership
     interest                $    47.53  $    51.98   $    45.34   $    51.71   $    71.64
                              =========   =========    =========    =========    =========
At year end:
  Total assets               $1,411,804  $1,661,127   $1,728,891   $1,886,057   $2,123,106
                              =========   =========    =========    =========    =========
</TABLE>
                                        5

<PAGE>



ITEM 7.     Management's Discussion and Analysis of Financial Condition and
               Results of Operations

Results of Operations

1997 compared to 1996

The  Partnership's  1997 oil and gas  revenues  decreased  21% to $661,475  from
$837,849 in 1996. The decrease in revenues  resulted from declines in production
and lower average prices received. In 1997, 25,817 barrels of oil, 3,661 barrels
of natural  gas  liquids  ("NGLs")  and  50,304 mcf of gas were sold,  or 37,862
barrel of oil equivalents  ("BOEs").  In 1996,  30,485 barrels of oil and 64,557
mcf of gas were sold, or 41,245 BOEs.

Consistent with the managing general  partner,  the Partnership has historically
accounted for processed  natural gas production as wellhead  production on a wet
gas basis. As a result of the merger with Mesa, the managing general partner has
adopted  Mesa's  accounting  policy and now accounts for  processed  natural gas
production  in two  components:  natural gas  liquids and dry residue  gas. As a
result of the change in the managing general partner's  policy,  the Partnership
now accounts  for  processed  natural gas  production  as processed  natural gas
liquids and dry residue gas. Consequently,  separate product volumes will not be
comparable for periods prior to September 30, 1997.

The declines in production  volumes were primarily  attributable  to the decline
characteristics  of the Partnership's  oil and gas properties.  Because of these
characteristics, management expects a certain amount of decline in production to
continue in the future until the Partnership's economically recoverable reserves
are fully depleted.

The average  price  received per barrel of oil  decreased  $2.40,  or 11%,  from
$21.88 in 1996 to $19.48 in 1997.  The average price received per barrel of NGLs
during 1997 was $10.58.  The average price received per mcf of gas decreased 10%
from $2.65 in 1996 to $2.38 in 1997.  The market  price for oil and gas has been
extremely  volatile in the past decade,  and management expects a certain amount
of  volatility  to continue  in the  foreseeable  future.  The  Partnership  may
therefore  sell its future oil and gas  production  at average  prices  lower or
higher than received in 1997.

Gain on disposition of assets of $800 was  attributable to credits received from
the disposal of oil and gas equipment on one fully depleted well for 1997.  Loss
on disposition  of assets of $6,508 was  recognized  during 1996 of which $6,674
was  attributable to the sale of one gas well,  offset by salvage income of $166
received from the disposal of oil and gas equipment on one well that was plugged
and  abandoned in a prior year and to credits  received from the disposal of oil
and gas equipment on three fully depleted wells.

Total costs and expenses  increased in 1997 to $562,477  compared to $477,266 in
1996, an increase of $85,211, or 18%. This increase was due to the impairment of
oil and gas properties and  depletion,  offset by decreases in production  costs
and general and administrative expenses ("G&A").

                                        6

<PAGE>


Production  costs were  $331,332 in 1997 and  $337,193 in 1996,  resulting  in a
$5,861  decrease.  The  decrease  was due to a decline in  production  taxes and
workover expense, offset by a slight increase in ad valorem taxes.

G&A's  components are independent  accounting and engineering  fees and managing
general partner personnel and operating costs. During this period G&A decreased,
in aggregate,  21% from $27,292 in 1996 to $21,436 in 1997. The Partnership paid
the  managing  general  partner  $17,703  in 1997  and  $24,441  in 1996 for G&A
incurred  on  behalf  of the  Partnership.  G&A is  allocated,  in part,  to the
Partnership  by the  managing  general  partner.  Such  allocated  expenses  are
determined by the managing general partner based upon its judgement of the level
of  activity  of the  Partnership  relative to the  managing  general  partner's
activities and other entities it manages. The method of allocation has varied in
certain  years and may do so again  depending on the  activities  of the managed
entities.

The Partnership  adopted  Statement of Financial  Accounting  Standards No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
be Disposed Of" ("SFAS 121")  effective as of October 1, 1995 (see Notes 2 and 3
of Notes to Financial  Statements included in "Item 8. Financial  Statements and
Supplementary Data"). As a result of the review and evaluation of its long-lived
assets for impairment,  the Partnership  recognized a non-cash charge of $79,288
related to its oil and gas properties during the fourth quarter of 1997.

Depletion was $130,421 in 1997 compared to $112,781 in 1996. This represented an
increase  of $17,640 or 16%.  This  increase  was  primarily  attributable  to a
decline  in oil  reserves  during  1997 as a result of lower  commodity  prices,
offset by a decline in oil  production  of 4,668 barrels for 1997 as compared to
1996.

1996 compared to 1995

The  Partnership's  1996 oil and gas  revenues  increased  16% to $837,849  from
$722,324 in 1995.  The increase in revenues  resulted from higher average prices
received per barrel of oil and mcf of gas,  offset by declines in barrels of oil
and mcf of gas  produced  and sold.  In 1996,  30,485  barrels  of oil were sold
compared to 33,586 in 1995, a decrease of 3,101 barrels,  or 9%. In 1996, 64,557
mcf of gas were sold  compared  to 80,229 in 1995,  a decrease of 15,672 mcf, or
20%. Of the decrease,  3,541 mcf, or 4%, was attributable to the sale of one gas
well during  1996,  with the  remaining  decrease of 12,131 mcf, or 16%,  due to
production declines.

The average price received per barrel of oil increased $4.69 from $17.19 in 1995
to $21.88 in 1996,  while the average  price  received per mcf of gas  increased
from $1.81 in 1995 to $2.65 in 1996.

Gain on  disposition  of assets of $9,214 was  recognized  during 1995 resulting
from the  receipt of  proceeds  from  equipment  salvage  on one fully  depleted
abandoned  property.  Expenses  incurred during 1995 to plug and abandon the one
well totaled $5,192.  During 1996, a loss on disposition of assets of $6,508 was
comprised of the write-off of remaining  capitalized well costs for one gas well
of $11,116,  less proceeds received of $4,442,  offset by salvage income of $166
received from the disposal of oil and gas equipment on one well that was plugged

                                        7

<PAGE>



and  abandoned in a prior year and to credits  received from the disposal of oil
and gas equipment on three fully depleted wells.

Total costs and expenses  decreased in 1996 to $477,266  compared to $572,778 in
1995,  a decrease  of  $95,512,  or 17%.  This  decrease  was due to declines in
production costs, the impairment of oil and gas properties, depletion, abandoned
property costs and amortization of organization  costs, offset by an increase in
G&A.

Production  costs were  $337,193 in 1996 and  $347,877 in 1995,  resulting  in a
$10,684  decrease  or 3%. The  decrease  was due to  declines in well repair and
maintenance costs and workover costs, offset by an increase in production taxes.

During this period G&A  increased,  in  aggregate,  11% from  $24,599 in 1995 to
$27,292 in 1996. The  Partnership  paid the managing  general partner $24,441 in
1996 and $21,294 in 1995 for G&A incurred on behalf of the Partnership.

The  Partnership  adopted SFAS 121  effective as of October 1, 1995 (see Notes 2
and 3 of Notes to Financial Statements included in "Item 8. Financial Statements
and  Supplementary  Data").  As a result of the  review  and  evaluation  of its
long-lived assets for impairment,  the Partnership  recognized a non-cash charge
of $48,088  related to its oil and gas  properties  during the fourth quarter of
1995.

Depletion was $112,781 in 1996 compared to $143,847 in 1995. This  represented a
decrease of $31,066 or 22%.  This  decrease was  primarily  attributable  to the
following  factors:  (i) a reduction in the  Partnership's  net depletable basis
from  charges  taken in  accordance  with  SFAS  121,  (ii) a  reduction  in oil
production of 3,101 barrels in 1996 from 1995,  and (iii) an increase in oil and
gas reserves during 1996 as a result of higher commodity prices.

Impact of inflation and changing prices on sales and net income

Inflation  impacts  the fixed  overhead  rate  charges  of the  lease  operating
expenses for the  Partnership.  During 1995,  the annual  change in the index of
average weekly earnings of crude petroleum and gas production  workers issued by
the U.S. Department of Labor, Bureau of Labor Statistics  increased by 4.4%. The
1996 annual change in the average  weekly  earnings  increased by 4.1%. The 1997
index  (effective April 1, 1997) increased 2%. The impact of inflation for other
lease operating  expenses is small due to the current economic  condition of the
oil industry.

The oil and gas industry  experienced  volatility during the past decade because
of the fluctuation of the supply of most fossil fuels relative to the demand for
such  products  and other  uncertainties  in the world  energy  markets  causing
significant  fluctuations  in oil and gas  prices.  During  1997,  the price per
barrel for oil production similar to the Partnership's ranged from approximately
$16.00 to $23.00. During most of 1997 and 1996, the Partnership  benefitted from
higher oil prices as  compared  to previous  years.  However,  during the fourth
quarter of 1997, oil prices began a downward trend that has continued into March
1998. On March 19, 1998, the market price for West Texas  intermediate crude was
$12.00 per  barrel.  A  continuation  of the oil price  environment  experienced

                                        8

<PAGE>

during  the  first  quarter  of  1998  will  have  an  adverse   effect  on  the
Partnership's  revenues and  operating  cash flow and could result in additional
decreases in the carrying value of the Partnership's oil and gas properties.

Prices for natural gas are subject to ordinary seasonal  fluctuations,  and this
volatility of natural gas prices may result in production  being  curtailed and,
in some cases, wells being completely shut-in.

Liquidity and capital resources

Net Cash Provided by Operating Activities

Net cash  provided by operating  activities  decreased  $16,545  during the year
ended December 31, 1997 from the year ended December 31, 1996, attributable to a
decrease in oil and gas sales receipts,  offset by a decline in production costs
and G&A expense paid.

Net Cash Provided by (Used in) Investing Activities

The  Partnership's  investing  activities  during  1997 and 1996,  respectively,
included  expenditures  related to equipment  replacement on various oil and gas
properties.

Proceeds from disposition of assets of $800 from the salvage of equipment on one
fully depleted well were received during 1997.  Proceeds of $4,608 from the sale
of one gas well were received during 1996.

Net Cash Used in Financing Activities

Cash was  sufficient  in 1997 for  distributions  to the partners of $361,567 of
which $3,615 was distributed to the managing general partner and $357,952 to the
limited partners. In 1996, cash was sufficient for distributions to the partners
of $395,420 of which $3,954 was distributed to the managing  general partner and
$391,466 to the limited partners.

It is expected that future net cash  provided by  operations  will be sufficient
for any capital  expenditures and any distributions.  As the production from the
properties declines, distributions are also expected to decrease.

Information systems for the year 2000

The general partner will be required to modify its information  systems in order
to accurately process Partnership data referencing the year 2000. Because of the
importance of occurrence dates in the oil and gas industry,  the consequences of
not pursuing these  modifications could be very significant to the Partnership's
ability  to manage and  report  operating  activities.  Currently,  the  general
partner plans to contract with third parties to perform the software programming
changes necessary to correct any existing deficiencies. Such programming changes
are  anticipated  to be  completed  and  tested by March 1, 1999.  The  managing
general  partner  will  allocate  a  portion  of  the  costs  of the  year  2000
programming  charges  to the  Partnership  when they are  incurred,  along  with
recurring  general  and  administrative  expenses  as  defined  pursuant  to the
partnership  agreement.  Although the costs are not estimable at this time, they
should not be significant to the Partnership.

                                        9

<PAGE>



ITEM 8.     Financial Statements and Supplementary Data



                          Index to Financial Statements

                                                                        Page

Financial Statements of Parker & Parsley 90-C Conv., L.P:
  Independent Auditors' Report........................................   11
  Balance Sheets as of December 31, 1997 and 1996.....................   12
  Statements of Operations for the Years Ended December 31,
    1997, 1996 and 1995...............................................   13
  Statements of Partners' Capital for the Years Ended
    December 31, 1997, 1996 and 1995..................................   14
  Statements of Cash Flows for the Years Ended December 31,
    1997, 1996 and 1995...............................................   15
  Notes to Financial Statements.......................................   16



                                       10

<PAGE>




                          INDEPENDENT AUDITORS' REPORT




The Partners
Parker & Parsley 90-C Conv., L.P.
  (A Delaware Limited Partnership):

We have audited the financial statements of Parker & Parsley 90-C Conv., L.P. as
listed  in  the  accompanying   index.   These  financial   statements  are  the
responsibility of the Partnership's management. Our responsibility is to express
an opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the financial  position of Parker & Parsley 90-C Conv.,
L.P. as of December 31, 1997 and 1996, and the results of its operations and its
cash flows for each of the years in the  three-year  period  ended  December 31,
1997, in conformity with generally accepted accounting principles.

As  discussed  in Notes 2 and 3 to the  financial  statements,  the  Partnership
adopted the provisions of the Financial  Accounting  Standards Board's Statement
of Financial  Accounting  Standards No. 121,  "Accounting  for the Impairment of
Long-Lived Assets and for Long-Lived Assets to Be Disposed Of" in 1995.




                                          KPMG Peat Marwick LLP


Midland, Texas
March 20, 1998



                                       11

<PAGE>



                        PARKER & PARSLEY 90-C CONV., L.P.
                        (A Delaware Limited Partnership)

                                 BALANCE SHEETS
                                   December 31



                                                   1997           1996
                                                -----------    -----------
                 ASSETS

Current assets:
  Cash and cash equivalents, including
     interest bearing deposits of $87,310
     in 1997 and $79,483 in 1996                $    87,423    $    79,564
  Accounts receivable - oil and gas sales            69,891        124,287
                                                 ----------     ----------
         Total current assets                       157,314        203,851
                                                    -------        -------
Oil and gas properties - at cost, based on
  the successful efforts accounting method        5,751,870      5,744,947
Accumulated depletion                            (4,497,380)    (4,287,671)
                                                 ----------     ----------
         Net oil and gas properties               1,254,490      1,457,276
                                                 ----------     ----------
                                                $ 1,411,804    $ 1,661,127
                                                 ==========     ==========
LIABILITIES AND PARTNERS' CAPITAL

Current liabilities:
  Accounts payable - affiliate                  $    23,946    $    17,442

Partners' capital:
  Managing general partner                           13,848         16,406
  Limited partners (7,531 interests)              1,374,010      1,627,279
                                                 ----------     ----------
                                                  1,387,858      1,643,685
                                                 ----------     ----------
                                                $ 1,411,804    $ 1,661,127
                                                 ==========     ==========



   The accompanying notes are an integral part of these financial statements.

                                       12

<PAGE>



                        PARKER & PARSLEY 90-C CONV., L.P.
                        (A Delaware Limited Partnership)

                            STATEMENTS OF OPERATIONS
                         For the years ended December 31


                                             1997         1996         1995
                                          ---------    ---------    ---------
Revenues:
   Oil and gas                            $ 661,475    $ 837,849    $ 722,324
   Interest                                   5,942        5,274        4,866
   Gain (loss) on disposition of assets         800       (6,508)       9,214
                                           --------     --------     --------
                                            668,217      836,615      736,404
                                           --------     --------     --------
Costs and expenses:
   Oil and gas production                   331,332      337,193      347,877
   General and administrative                21,436       27,292       24,599
   Impairment of oil and gas properties      79,288          -         48,088
   Depletion                                130,421      112,781      143,847
   Abandoned property                           -            -          5,192
   Amortization of organization costs           -            -          3,175
                                           --------     --------     --------
                                            562,477      477,266      572,778
                                           --------     --------     --------
Net income                                $ 105,740    $ 359,349    $ 163,626
                                           ========     ========     ========
Allocation of net income:
   Managing general partner               $   1,057    $   3,593    $   1,668
                                           ========     ========     ========
   Limited partners                       $ 104,683    $ 355,756    $ 161,958
                                           ========     ========     ========
Net income per limited partnership
   interest                               $   13.90    $   47.24    $   21.51
                                           ========     ========     ========




   The accompanying notes are an integral part of these financial statements.

                                       13

<PAGE>



                        PARKER & PARSLEY 90-C CONV., L.P.
                        (A Delaware Limited Partnership)

                         STATEMENTS OF PARTNERS' CAPITAL




                                           Managing
                                           general      Limited
                                           partner      partners       Total
                                          ---------    ----------    ----------

Partners' capital at January 1, 1995      $  18,549    $1,842,493    $1,861,042

    Distributions                            (3,450)     (341,462)     (344,912)

    Net income                                1,668       161,958       163,626
                                           --------     ---------     ---------

Partners' capital at December 31, 1995       16,767     1,662,989     1,679,756

    Distributions                            (3,954)     (391,466)     (395,420)

    Net income                                3,593       355,756       359,349
                                           --------     ---------     ---------

Partners' capital at December 31, 1996       16,406     1,627,279     1,643,685

    Distributions                            (3,615)     (357,952)     (361,567)

    Net income                                1,057       104,683       105,740
                                           --------     ---------     ---------

Partners' capital at December 31, 1997    $  13,848    $1,374,010    $1,387,858
                                           ========     =========     =========




   The accompanying notes are an integral part of these financial statements.

                                       14

<PAGE>



                        PARKER & PARSLEY 90-C CONV., L.P.
                        (A Delaware Limited Partnership)

                            STATEMENTS OF CASH FLOWS
                         For the years ended December 31


                                               1997          1996          1995
                                            ---------    ---------    ---------
Cash flows from operating activities:
 Net income                                 $ 105,740    $ 359,349    $ 163,626
 Adjustments to reconcile net income
    to net cash provided by operating
    activities:
      Impairment of oil and gas properties     79,288          -         48,088
      Depletion and amortization              130,421      112,781      147,022
      (Gain) loss on disposition of assets       (800)       6,508       (9,214)
 Changes in assets and liabilities:
      Accounts receivable                      54,396      (54,851)       4,310
      Accounts payable                          6,504      (31,693)      24,120
                                             --------     --------     --------
         Net cash provided by operating
           activities                         375,549      392,094      377,952
                                             --------     --------     --------
Cash flows from investing activities:
 Additions to oil and gas properties           (6,923)      (3,869)      (8,077)
 Proceeds from disposition of assets              800        4,608        9,214
                                             --------     --------     --------
         Net cash provided by (used in)
           investing activities                (6,123)         739        1,137
                                             --------     --------     --------
Cash flows from financing activities:
 Cash distributions to partners              (361,567)    (395,420)    (344,912)
                                             --------     --------     --------
Net increase (decrease) in cash and cash
  equivalents                                   7,859       (2,587)      34,177
Cash and cash equivalents at beginning
  of year                                      79,564       82,151       47,974
                                             --------     --------     --------
Cash and cash equivalents at end of year    $  87,423    $  79,564    $  82,151
                                             ========     ========     ========




   The accompanying notes are an integral part of these financial statements.

                                       15

<PAGE>


                        PARKER & PARSLEY 90-C CONV., L.P.
                        (A Delaware Limited Partnership)

                          NOTES TO FINANCIAL STATEMENTS
                        December 31, 1997, 1996 and 1995

Note 1.     Organization and nature of operations

       Parker &  Parsley  90-C  Conv.,  L.P.  (the  "Partnership")  is a general
partnership  organized  in 1990  under  the  laws of the  State  of  Texas.  The
Partnership converted to a Delaware limited partnership on August 1, 1991. As of
August 8, 1997,  Pioneer Natural Resources USA, Inc.  ("Pioneer USA") became the
managing  general  partner  of the  Partnership.  Prior to August 8,  1997,  the
Partnership's  managing  general partner was Parker & Parsley  Development  L.P.
("PPDLP"),  a  wholly-owned  subsidiary  of Parker & Parsley  Petroleum  Company
("Parker & Parsley"). On August 7, 1997, Parker & Parsley and Mesa Inc. received
shareholder  approval  to merge and create  Pioneer  Natural  Resources  Company
("Pioneer").  On August 8, 1997,  PPDLP was merged with and into  Pioneer USA, a
wholly-owned  subsidiary  of  Pioneer,  resulting  in Pioneer USA  becoming  the
managing general partner of the Partnership as PPDLP's successor by merger.

         The  Partnership  engages  primarily  in oil  and gas  development  and
production  in Texas and is not involved in any industry  segment other than oil
and gas.

Note 2.     Summary of significant accounting policies

         A summary of the significant  accounting policies  consistently applied
in the preparation of the accompanying financial statements follows:

         The Partnership accounts for long-lived assets to be disposed of at the
lower of their carrying  amount or fair value less costs to sell once management
has committed to a plan to dispose of the assets.

         Oil  and gas  properties  - The  Partnership  utilizes  the  successful
efforts method of accounting for its oil and gas properties and equipment. Under
this  method,  all costs  associated  with  productive  wells and  nonproductive
development  wells are capitalized  while  nonproductive  exploration  costs are
expensed. Capitalized costs relating to proved properties are depleted using the
unit-of-production  method on a  property-by-property  basis based on proved oil
(dominant  mineral)  reserves as determined by the engineering  staff of Pioneer
USA, the  Partnership's  managing general  partner,  and reviewed by independent
petroleum  consultants.  The carrying  amounts of  properties  sold or otherwise
disposed of and the related  allowances  for depletion are  eliminated  from the
accounts and any gain or loss is included in operations.

         Impairment  of  long-lived  assets - In  accordance  with  Statement of
Financial  Accounting  Standards  No. 121,  "Accounting  for the  Impairment  of
Long-Lived Assets and for Long-Lived Assets to be Disposed Of" ("SFAS 121"), the
Partnership  reviews its long-lived  assets to be held and used on an individual
property  basis,  including  oil and gas  properties  accounted  for  under  the
successful  efforts  method of  accounting,  whenever  events  or  circumstances
indicate that  the carrying  value of  those assets may  not be recoverable.  An

                                       16

<PAGE>


impairment  loss is indicated  if the sum of the  expected  future cash flows is
less  than  the  carrying  amount  of the  assets.  In  this  circumstance,  the
Partnership  recognizes an impairment  loss for the amount by which the carrying
amount of the asset exceeds the fair value of the asset.

         Use  of  estimates  in  the  preparation  of  financial   statements  -
Preparation  of  the  accompanying   financial  statements  in  conformity  with
generally accepted  accounting  principles requires management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the  reporting  amounts  of  revenues  and  expenses  during the
reporting period. Actual results could differ from those estimates.

         Organization  costs - Organization  costs are capitalized and amortized
on the straight-line method over 60 months.

         Net  income  per  limited  partnership  interest  - The net  income per
limited  partnership  interest is calculated by using the number of  outstanding
limited partnership interests.

         Income taxes - A Federal  income tax provision has not been included in
the  financial  statements as the income of the  Partnership  is included in the
individual Federal income tax returns of the respective partners.

         Statements of cash flows - For purposes of reporting  cash flows,  cash
and cash equivalents include depository accounts held by banks.

         General  and  administrative  expenses  -  General  and  administrative
expenses  are  allocated  in part to the  Partnership  by the  managing  general
partner  or its  affiliates.  Such  allocated  expenses  are  determined  by the
managing  general  partner  based upon its judgement of the level of activity of
the Partnership  relative to the managing general partner's activities and other
entities it manages.  The method of  allocation  has varied in certain years and
may do so again depending on the activities of the managed entities.

         Reclassifications  -  Certain  reclassifications  have been made to the
1996 and 1995 financial  statements to conform to the 1997  financial  statement
presentation.

         Environmental - The Partnership is subject to extensive federal,  state
and local  environmental laws and regulations.  These laws, which are constantly
changing,  regulate  the  discharge of materials  into the  environment  and may
require the Partnership to remove or mitigate the  environmental  effects of the
disposal  or release of  petroleum  or  chemical  substances  at various  sites.
Environmental expenditures are expensed or capitalized depending on their future
economic benefit.  Expenditures  that relate to an existing  condition caused by
past  operations  and  that  have no  future  economic  benefits  are  expensed.
Liabilities  for   expenditures  of  a  noncapital   nature  are  recorded  when
environmental  assessment and/or  remediation is probable,  and the costs can be
reasonably  estimated.  Such liabilities are generally  undiscounted  unless the
timing of cash  payments for the  liability  or component  are fixed or reliably
determinable.

                                       17

<PAGE>



Note 3.     Impairment of long-lived assets

         The Partnership adopted SFAS 121 October 1, 1995. In order to determine
whether an  impairment  has  occurred,  the  Partnership  estimates the expected
future cash flows of its oil and gas  properties  and compares  such future cash
flows to the carrying  amount of the oil and gas  properties to determine if the
carrying amount is recoverable.   For those oil and gas properties for which the
carrying  amount  exceeded the estimated  future cash flows,  an impairment  was
determined to exist; therefore,  the Partnership adjusted the carrying amount of
those oil and gas  properties to their fair value as  determined by  discounting
their expected future cash flows at a discount rate  commensurate with the risks
involved  in the  industry.  As a result of the  review  and  evaluation  of its
long-lived assets for impairment, the Partnership recognized non-cash charges of
$79,288  and  $48,088  related to its oil and gas  properties  during the fourth
quarters of 1997 and 1995, respectively.

Note 4.     Income taxes

         The  financial  statement  basis of the  Partnership's  net  assets and
liabilities was $302,765 greater than the tax basis at December 31, 1997.

         The  following  is a  reconciliation  of net income per  statements  of
operations  with the net income per  Federal  income tax  returns  for the years
ended December 31:
                                                1997        1996        1995
                                              ---------   ---------   ---------
  Net income per statements of operations     $ 105,740   $ 359,349   $ 163,626
  Intangible development costs
    capitalized for financial reporting
    purposes and expensed for tax
    reporting purposes                              -           -          (952)
  Depletion and depreciation provisions
    for tax reporting purposes over amounts
    for financial reporting purposes            (98,399)   (121,400)    (91,047)
  Impairment of oil and gas properties
    for financial reporting purposes             79,288         -        48,088
  Other                                          (2,081)      6,706     (13,742)
                                               --------    --------    --------
       Net income per Federal
         income tax returns                   $  84,548   $ 244,655   $ 105,973
                                               ========    ========    ========

Note 5.     Oil and gas producing activities

       The following is a summary of the costs incurred,  whether capitalized or
expensed,  related to the Partnership's oil and gas producing activities for the
years ended December 31:
                                                1997        1996        1995
                                              --------    --------    --------
       Development costs                      $  6,123    $  3,704    $  4,055
                                               =======     =======     =======
                                       18

<PAGE>



            Capitalized oil and gas properties consist of the following:

                                                   1997           1996
                                                -----------    -----------
     Proved properties:
        Property acquisition costs              $   226,701    $   226,701
        Completed wells and equipment             5,525,169      5,518,246
                                                 ----------     ----------
                                                  5,751,870      5,744,947
     Accumulated depletion                       (4,497,380)    (4,287,671)
                                                 ----------     ----------
            Net capitalized costs               $ 1,254,490    $ 1,457,276
                                                 ==========     ==========

       During 1997,  the  Partnership  recognized  a non-cash  charge of $79,288
against oil and gas properties associated with SFAS 121. See Note 3.

Note 6.     Related party transactions

       Pursuant to the limited  partnership  agreement,  the Partnership had the
following  related party  transactions  with the managing general partner or its
affiliates during the years ended December 31:

                                            1997         1996         1995
                                          ---------    ---------    ---------
    Payment of lease operating
       and supervision charges in
       accordance with standard
       industry operating
       agreements                         $ 128,942    $ 120,014    $ 117,312

    Reimbursement of general and
       administrative expenses            $  17,703    $  24,441    $  21,294

    Purchase of oil and gas properties
       and related equipment, at
       predecessor cost                   $   4,524    $   1,869    $     -

    Receipt of proceeds for the
       salvage of retired oil and
       gas equipment                      $     -      $     -      $   3,448

       The Partnership  participates in oil and gas activities through an income
tax partnership (the "Program") pursuant to the Program agreement.  Pioneer USA,
P&P Employees 90-C Conv., L.P. ("EMPL") (the "Entities"), Parker & Parsley 90-C,
L.P.  and the  Partnership  (the  "Partnerships")  are  parties  to the  Program
agreement.  EMPL is a limited  partnership  organized for the benefit of certain
employees of Pioneer USA.

       The costs and  revenues of the Program are  allocated to the Entities and
the Partnerships as follows:
                                       19

<PAGE>


                                                 Entities (1)   Partnerships (2)
                                                 ------------   ----------------
Revenues:
  Proceeds from disposition of depreciable
    and depletable properties -
      First three years                           14.141414%        85.858586%
      After first three years                     19.191919%        80.808081%
  All other revenues -
      First three years                           14.141414%        85.858586%
      After first three years                     19.191919%        80.808081%
Costs and expenses:
  Lease acquisition costs, drilling and
    completion costs and all other costs           9.090909%        90.909091%
  Operating costs, reporting and legal expenses
    and general and administrative expenses-
      First three years                           14.141414%        85.858586%
      After first three years                     19.191919%        80.808081%

    (1)   Excludes Pioneer USA's 1% general partner ownership which is allocated
          at  the Partnership  level and 30  limited  partner interests owned by
          Pioneer USA.
    (2)   The allocation between the Partnership and Parker & Parsley 90-C, L.P.
          is 38.349119% and 61.650881%, respectively.

Note 7.     Oil and gas information (unaudited)

       The following table represents  information relating to the Partnership's
estimated  proved oil and gas reserves at December  31, 1997,  1996 and 1995 and
changes in such quantities during the years then ended. All of the Partnership's
reserves  are proved and located  within the United  States.  The  Partnership's
reserves are based on an evaluation prepared by the engineering staff of Pioneer
USA  and  reviewed  by  an  independent  petroleum  consultant,  using  criteria
established by the Securities and Exchange Commission. Reserve value information
is available to limited  partners  pursuant to the  Partnership  agreement  and,
therefore, is not presented.
                                                  Oil and NGLs         Gas
                                                     (bbls)           (mcf)
                                                   ----------      -----------
    Net proved reserves at January 1, 1995            434,210        1,132,381
    Revisions                                         (13,797)         (87,690)
    Production                                        (33,586)         (80,229)
                                                   ----------      -----------
    Net proved reserves at December 31, 1995          386,827          964,462
    Revisions                                          95,644          258,581
    Sale of reserves                                     (126)         (18,702)
    Production                                        (30,485)         (64,557)
                                                   ----------      -----------
    Net proved reserves at December 31, 1996          451,860        1,139,784
    Revisions                                           2,219         (662,760)
    Production                                        (29,478)         (50,304)
                                                   ----------      -----------
    Net proved reserves at December 31, 1997          424,601          426,720
                                                   ==========      ===========
                                       20

<PAGE>



       The estimated  present  value of future net revenues of proved  reserves,
calculated  using  December 31, 1997 prices of $17.22 per barrel of oil,  $12.42
per barrel of NGLs and $2.15 per mcf of gas, discounted at 10% was approximately
$1,668,000 and undiscounted  was $3,029,000 at December 31, 1997.  Subsequent to
December 31, 1997, the prices of oil and gas have been  declining,  and on March
19,  1998,  the  average  prices  for  the   Partnership's   oil  and  gas  were
approximately $12.00 and $2.05, respectively.

       The  Partnership   emphasizes  that  reserve   estimates  are  inherently
imprecise  and,  accordingly,  the  estimates  are  expected to change as future
information becomes available.

Note 8.     Major customers

       The following table reflects the major customers of the Partnership's oil
and gas sales (a major  customer is defined as a customer whose sales exceed 10%
of total sales) during the years ended December 31:

                                                 1997        1996        1995
                                               --------    --------    --------
          Genesis Crude Oil, L.P.                 69%         73%         73%
          Western Gas Resources, Inc.             12%          -           -
          GPM Gas Corporation                      -           -          10%

       The  above  customers  represent  65% of  total  accounts  receivable  at
December 31, 1997.

       Pioneer USA is party to a long-term  agreement  pursuant to which Pioneer
USA and affiliates are to sell to Basis Petroleum, Inc. (formerly Phibro Energy,
Inc.)  substantially  all crude  oil  (including  condensate)  which any of such
entities  have the right to market  from time to time.  On  November  25,  1996,
Pioneer USA  consented to the  assignment of the agreement to Genesis Crude Oil,
L.P.  ("Genesis"),  a limited  partnership  formed by Basis Petroleum,  Inc. and
Howell Corporation.  The price to be paid by Genesis for oil purchased under the
agreement  ("Genesis  Agreement") is to be competitive with prices paid by other
substantial  purchasers  in the same areas who are  significant  competitors  of
Genesis.  The price to be paid for oil  purchased  under the  Genesis  Agreement
includes a  market-related  bonus  that may vary from month to month  based upon
spot oil prices at  various  commodity  trade  points.  The term of the  Genesis
Agreement is through June 30, 1998,  and it may continue  thereafter  subject to
termination  rights  afforded each party.  Salomon,  Inc., the parent company of
Basis Petroleum, Inc. and a subordinated limited partner in Genesis, secures the
payment  obligations  under the Genesis  Agreement  with a $25  million  payment
guarantee.  Accounts  receivable-oil  and gas sales  included  $31,961  due from
Genesis at December 31, 1997.

Note 9.     Organization and operations

       The Partnership was organized December 28, 1990 as a general  partnership
under the Texas Uniform General Partnership Act for the purpose of acquiring and
developing  oil and gas  properties.  The  Partnership  converted  to a Delaware
limited  partnership on August 1, 1991. The managing general partner received an

                                       21

<PAGE>



opinion of legal counsel to the effect that such  conversion  will not result in
material adverse tax  consequences to the Partnership.  The following is a brief
summary of the more significant provisions of the limited partnership agreement:

       Managing   general  partner  -  The  managing   general  partner  of  the
       Partnership  is Pioneer USA.  Pioneer USA has the power and  authority to
       manage, control and administer all Program and Partnership affairs. Under
       the Partnership  agreement,  the managing  general partner pays 1% of the
       Partnership's  acquisition,  drilling and completion  costs and 1% of its
       operating  and  general and  administrative  expenses.  In return,  it is
       allocated 1% of the Partnership's revenues.

       Limited  partner  liability  - The  maximum  amount of  liability  of any
       limited partner is the total contributions of such partner plus his share
       of any undistributed profits.

       Initial capital  contributions - The partners  entered into  subscription
       agreements for aggregate capital contributions of $7,531,000. Pioneer USA
       is  required to  contribute  amounts  equal to 1% of initial  Partnership
       capital less commission and  organization and offering costs allocated to
       the limited partners and to contribute amounts necessary to pay costs and
       expenses  allocated to it under the  Partnership  agreement to the extent
       its share of revenues does not cover such costs.

Note 10.     Disposition of Assets

       Loss on  disposition of assets during 1996 was primarily due to a loss of
$6,674 on sale of assets to Costilla Energy, L.L.C.,  resulting from the sale of
one gas well and the write-off of remaining  capitalized  well costs for one gas
well of $11,116 less proceeds received of $4,442.

                                       22

<PAGE>



ITEM 9.     Changes in and Disagreements with Accountants on Accounting
              and Financial Disclosure

None


                                       23

<PAGE>


                                    PART III

ITEM 10.     Directors and Executive Officers of the Partnership

The  Partnership  does not have any  officers  or  directors.  Under the limited
partnership agreement,  the Partnership's managing general partner, Pioneer USA,
is  granted  the  exclusive  right and full  authority  to manage,  control  and
administer the Partnership's business.  Pioneer USA is a wholly-owned subsidiary
of  Parker &  Parsley  Petroleum  Company  (the  "Company"),  a  publicly-traded
corporation on the New York Stock Exchange.

Set forth below are the names, ages and positions of the directors and executive
officers of Pioneer USA. Directors of Pioneer USA are elected to serve until the
next annual meeting of  stockholders  or until their  successors are elected and
qualified.
                            Age at
                         December 31,
        Name                 1997                       Position
- --------------------     ------------     -------------------------------------
Scott D. Sheffield            45          President and Director

Timothy L. Dove               41          Executive Vice President and Director

Dennis E. Fagerstone          48          Executive Vice President and Director

Mark L. Withrow               50          Executive Vice President, General
                                            Counsel and Director

M. Garrett Smith              36          Executive Vice President, Chief
                                            Financial Officer and Director

Mel Fischer                   63          Executive Vice President

Lon C. Kile                   42          Executive Vice President

Rich Dealy                    31          Vice President and Chief Accounting
                                              Officer

     Scott D.  Sheffield.  Mr.  Sheffield  is a  distinguished  graduate  of The
University of Texas with a B.S. in Petroleum Engineering.  Since August 1997, he
has served as President,  Chief Executive  Officer and a director of Pioneer and
President  and a director of Pioneer USA. Mr.  Sheffield was the President and a
director  of  Parker  &  Parsley  from May 1990  until  August  1997 and was the
Chairman  of the Board  and Chief  Executive  Officer  of Parker & Parsley  from
October  1990 until August  1997.  He was the sole  director of Parker & Parsley
from  May 1990  until  October  1990.  Mr.  Sheffield  joined  Parker &  Parsley
Development Company ("PPDC"),  a predecessor of Parker & Parsley, as a petroleum
engineer  in 1979.  He  served  as Vice  President  -  Engineering  of PPDC from
September 1981 until April 1985 when he was elected President and a director. In
March 1989, Mr.  Sheffield was elected Chairman of the Board and Chief Executive
Officer of PPDC. Before joining PPDC, Mr. Sheffield was employed as a production
and reservoir engineer for Amoco Production Company.

                                       24

<PAGE>

     Timothy L. Dove.  Mr.  Dove  became  Executive  Vice  President  - Business
Development  of Pioneer and Pioneer USA in August 1997. He was also  appointed a
director of Pioneer USA in August 1997.  Mr. Dove joined Parker & Parsley in May
1994 as Vice President - International and was promoted to Senior Vice President
- - Business Development in October 1996, in which position he served until August
1997.  Prior to joining  Parker & Parsley,  Mr. Dove was  employed  with Diamond
Shamrock Corp., and its successor,  Maxus Energy Corp, in various  capacities in
international exploration and production,  marketing, refining and marketing and
planning and development.  Mr. Dove earned a B.S. in Mechanical Engineering from
Massachusetts  Institute of Technology  in 1979 and received his M.B.A.  in 1981
from the University of Chicago.

     Dennis E. Fagerstone.  Mr. Fagerstone, a graduate of the Colorado School of
Mines with a B.S. in Petroleum  Engineering,  became an Executive Vice President
of Pioneer and Pioneer USA in August 1997.  He was also  appointed a director of
Pioneer USA in August 1997.  He served as  Executive  Vice  President  and Chief
Operating  Officer of Mesa from March 1, 1997 until  August  1997.  From October
1996 to February 1997, Mr.  Fagerstone served as Senior Vice President and Chief
Operating  Officer of Mesa and from May 1991 to October  1996, he served as Vice
President - Exploration  and Production of Mesa. From June 1988 to May 1991, Mr.
Fagerstone served as Vice President - Operations of Mesa.

     Mark L. Withrow.  Mr. Withrow,  a graduate of Abilene Christian  University
with a B. S. in  Accounting  and Texas Tech  University  with a Juris  Doctorate
degree,  became  Executive  Vice  President,  General  Counsel and  Secretary of
Pioneer  and  Pioneer USA in August  1997.  He was also  appointed a director of
Pioneer USA in August 1997. Mr. Withrow was Vice President - General  Counsel of
Parker & Parsley from January 1991, when he joined Parker & Parsley,  to January
1995,  when he was appointed  Senior Vice  President - General  Counsel.  He was
Parker &  Parsley's  Secretary  from  August 1992 until  August  1997.  Prior to
joining Parker & Parsley,  Mr. Withrow was the managing  partner of the law firm
of Turpin, Smith, Dyer, Saxe & MacDonald, Midland, Texas.

     M. Garrett  Smith.  Mr. Smith, a graduate of The University of Texas with a
B.S. in Electrical Engineering and Southern Methodist University with an M.B.A.,
was appointed Executive Vice President and Chief Financial Officer of Pioneer in
December  1997.  He served as Senior Vice  President  - Finance of Pioneer  from
August 1997 until  December  1997. Mr. Smith was elected Senior Vice President -
Finance  and a  director  of  Pioneer  USA in  August  1997.  He  served as Vice
President - Corporate  Acquisitions of Mesa from January 1997 until August 1997.
From October 1996 to December 1996, Mr. Smith served as Vice President - Finance
of Mesa and from 1994 to 1996 he served as  Director  of  Financial  Planning of
Mesa. Mr. Smith was employed by BTC Partners,  Inc. (a former financial  advisor
to Mesa) from 1989 to 1994.

     Mel Fischer.  Mr.  Fischer,  a graduate of the  University of California at
Berkeley with a Masters  degree in Geology,  became  Executive  Vice President -
Worldwide  Exploration of Pioneer and Pioneer USA in August 1997. He served as a
director  of Parker & Parsley  from  November  1995  until  August  1997 and was
Executive  Vice  President -  Worldwide  Exploration  for Parker & Parsley  from
February 1997 to August 1997. Mr.  Fischer worked in the petroleum  industry for
32 years, starting as a Petroleum Geologist with Texaco in 1962, and retiring as
President,  Occidental International Exploration and Production Company in March
1994. For the 10 years prior to becoming President of Occidental  International,

                                       25

<PAGE>

he served as Executive Vice President,  World Wide  Exploration  with Occidental
Oil  and  Gas  Corporation.  He  is  a  registered  geologist  in  the  State of
California,  a member of the American Association of Petroleum Geologists and an
emeritus  member  of the  Board of  Advisors  for the  Earth  Sciences  Research
Institute at the University of Utah.

     Lon C. Kile.  Mr.  Kile,  a graduate of Oklahoma  State  University  with a
B.B.A. in Accounting, became Executive Vice President of Pioneer and Pioneer USA
in August 1997.  Mr. Kile was Senior Vice  President - Investor  Relations  from
October 1996 to August 1997. Previously, he served as Vice President and Manager
of the  Mid-Continent  Division,  Vice President - Equity Finance & Analysis and
Vice President - Marketing & Program  Administration.  Prior to joining Parker &
Parsley in 1985,  he was employed as  Supervisor - Senior,  Audit,  in charge of
Parker & Parsley's audit, with Ernst & Young.

     Rich Dealy. Mr. Dealy is a graduate of Eastern New Mexico University with a
B.B.A. in Accounting and Finance and is a Certified Public Accountant. He became
Vice  President  and Chief  Accounting  Officer of Pioneer  and  Pioneer  USA in
February 1998. Mr. Dealy served as Controller of Pioneer USA from August 1997 to
February  1998.  He served as Controller of Parker & Parsley from August 1995 to
August 1997. Mr. Dealy joined Parker & Parsley as an Accounting Manager in July,
1992. He was previously  employed with KPMG Peat Marwick as an Audit Senior,  in
charge of Parker & Parsley's audit.

ITEM 11.     Executive Compensation

The  Partnership  does not have any  directors  or officers.  Management  of the
Partnership  is vested  in  Pioneer  USA,  the  managing  general  partner.  The
Partnership  participates  in oil and  gas  activities  through  an  income  tax
partnership (the "Program") pursuant to the Program agreement. Under the Program
agreement,  Pioneer  USA  and  P&P  Employees  90-C  Conv.,  L.P.  ("EMPL")  pay
approximately  10% of the  Partnership's  acquisition,  drilling and  completion
costs and  approximately  15% during the first three years and approximately 20%
after three years of its operating and general and administrative  expenses.  In
return,  they are allocated  approximately  15% during the first three years and
approximately 20% after three years of the Partnership's  revenues.  See Notes 6
and 9 of Notes to Financial Statements included in "Item 8. Financial Statements
and Supplementary  Data" for information  regarding fees and reimbursements paid
to the managing general partner or its affiliates by the Partnership.

Pioneer  USA's  current  executive  officers  and other  employees  are  general
partners of EMPL which serves as a co-general partner of the Program. Under this
arrangement,  EMPL pays  approximately  2.5% of the  Partnership's  acquisition,
drilling and  completion  costs and  approximately  3.75% during the first three
years and  approximately  5% after three years of its  operating and general and
administrative expenses. In return, EMPL is allocated approximately 3.75% during
the  first  three  years  and   approximately   5%  after  three  years  of  the
Partnership's  revenues.  EMPL does not receive any fees or reimbursements  from
the Partnership.

The Partnership does not directly pay any salaries of the executive  officers of
Pioneer USA, but does pay a portion of Pioneer USA's general and  administrative
expenses of which these  salaries  are a part.  See Note 6 of Notes to Financial
Statements included in "Item 8. Financial Statements and Supplementary Data".

                                       26

<PAGE>



ITEM 12.     Security Ownership of Certain Beneficial Owners and Management

(a)      Beneficial owners of more than five percent

The Partnership is not aware of any person who  beneficially  owns 5% or more of
the outstanding  limited partnership  interests of the Partnership.  Pioneer USA
owned 30 limited partner interests at January 1, 1998.

(b)      Security ownership of management

The Partnership  does not have any officers or directors.  The managing  general
partner  of the  Partnership,  Pioneer  USA,  has the  exclusive  right and full
authority to manage,  control and administer the Partnership's  business.  Under
the limited  partnership  agreement,  limited partners holding a majority of the
outstanding  limited  partnership  interests  have  the  right  to take  certain
actions,  including  the removal of the  managing  general  partner or any other
general  partner.  The  Partnership  is not aware of any current  arrangement or
activity  which may lead to such removal.  The  Partnership  is not aware of any
officer or director of Pioneer USA who  beneficially  owns  limited  partnership
interests in the Partnership.

ITEM 13.     Certain Relationships and Related Transactions

Transactions with the managing general partner or its affiliates

Pursuant to the limited partnership agreement, the Partnership had the following
related party  transactions  with the managing general partner or its affiliates
during the years ended December 31:
                                              1997         1996         1995
                                            ---------    ---------    ---------
   Payment of lease operating and
      supervision charges in accordance
      with standard industry operating
      agreements                            $ 128,942    $ 120,014    $ 117,312

   Reimbursement of general and
      administrative expenses               $  17,703    $  24,441    $  21,294

   Purchase of oil and gas properties
      and related equipment, at
      predecessor cost                      $   4,524    $   1,869    $     -

   Receipt of proceeds for the salvage
      of retired oil and gas equipment      $     -      $     -      $   3,448

Under the limited partnership agreement, the managing general partner pays 1% of
the  Partnership's  acquisition,  drilling  and  completion  costs and 1% of its
operating and general and administrative expenses. In return, it is allocated 1%
of the  Partnership's  revenues.  Also,  see Notes 6 and 9 of Notes to Financial
Statements  included in "Item 8. Financial  Statements and Supplementary  Data",
regarding the Partnership's  participation  with the managing general partner in
oil and gas activities of the Program.

                                       27

<PAGE>



                                     PART IV


ITEM 14.     Exhibits, Financial Statement Schedules and Reports on Form 8-K.

(a)    1.    Financial statements

             The following are filed as part of this annual report:

                Independent Auditors' Report

                Balance sheets as of December 31, 1997 and 1996

                Statements of operations for the years ended December 31, 1997,
                  1996 and 1995

                Statements of partners' capital for the years ended December 31,
                  1997, 1996 and 1995

                Statements of cash flows for the years ended December 31, 1997,
                   1996 and 1995

                Notes to financial statements

       2.    Financial statement schedules

             All  financial  statement  schedules  have been  omitted  since the
             required  information  is in  the  financial  statements  or  notes
             thereto, or is not applicable nor required.

(b)    Reports on Form 8-K

       None

(c)    Exhibits

       The exhibits  listed on the  accompanying  index to exhibits are filed or
       incorporated by reference as part of this annual report.



                                       28

<PAGE>


                              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, thereunto duly authorized.
                                           PARKER & PARSLEY 90-C CONV., L.P.

Dated: March 24, 1998               By:    Pioneer Natural Resources USA, Inc.
                                             Managing General Partner

                                           By:  /s/ Scott D. Sheffield
                                                -----------------------------
                                                Scott D. Sheffield, President

       Pursuant to the requirements of the Securities Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
Registrant and in the capacities and on the date indicated.

/s/ Scott D. Sheffield     President and Director of              March 24, 1998
- ------------------------   Pioneer USA
Scott D. Sheffield

/s/ Timothy L. Dove        Executive Vice President and           March 24, 1998
- ------------------------   Director of Pioneer USA
Timothy L. Dove

/s/ Dennis E. Fagerstone   Executive Vice President and           March 24, 1998
- ------------------------   Director of Pioneer USA
Dennis E. Fagerstone

/s/ Mark L. Withrow        Executive Vice President, General      March 24, 1998
- ------------------------   Counsel and Director of Pioneer USA
Mark L. Withrow

/s/ M. Garrett Smith       Executive Vice President, Chief        March 24, 1998
- ------------------------   Financial Officer and Director
M. Garrett Smith           of Pioneer USA

/s/ Mel Fischer            Executive Vice President of            March 24, 1998
- ------------------------   Pioneer USA
Mel Fischer

/s/ Lon C. Kile            Executive Vice President of            March 24, 1998
- ------------------------   Pioneer USA
Lon C. Kile

/s/ Rich Dealy             Vice President and Chief Accounting    March 24, 1998
- ------------------------   Officer of Pioneer USA
Rich Dealy
                                       29

<PAGE>


                        PARKER & PARSLEY 90-C CONV., L.P.

                                INDEX TO EXHIBITS


       The following documents are incorporated by reference in response to Item
14(c):

  Exhibit No.                     Description                            Page
  -----------                     -----------                            ----
     3(a)        Form of Agreement of Limited Partnership                  -
                 of Parker & Parsley 90-C Conv., L.P.
                 incorporated by reference to Exhibit A of
                 the Post-Effective Amendment No. 1 of
                 the Partnership's Registration Statement
                 on Form S-1 (Registration No. 33-26097)

     4(b)        Form of Limited Partner Subscription Agree-               -
                 ment incorporated by reference to Exhibit C
                 of the Post-Effective Amendment No. 1 of
                 the Partnership's Registration Statement on
                 Form S-1 (Registration No. 33-26097)

     4(b)        Form of General Partner Subscription Agreement            -
                 incorporated by reference to Exhibit D of the
                 Post-Effective Amendment No. 1 of the Part-
                 nership's Registration Statement on Form S-1
                 (Registration No. 33-26097)

     4(b)        Power of Attorney incorporated by reference to            -
                 Exhibit B of Amendment No. 1 of the Partner-
                 ship's Registration Statement on Form S-1
                 (Registration No. 33-26097)

     4(c)        Specimen Certificate of Limited Partnership               -
                 Interest incorporated by reference to Exhibit 4c
                 of the Partnership's Registration Statement on
                 Form S-1 (Registration No. 33-26097)

    10(b)        Form of Development Drilling Program                      -
                 Agreement incorporated by reference to Exhibit
                 B of the Post-Effective Amendment No. 1 of
                 the Partnership's Registration Statement on
                 Form S-1 (Registration No. 33-26097)

      27.1*      Financial Data Schedule

*Filed herewith


                                       30

<PAGE>




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<ARTICLE> 5
<CIK> 0000882342
<NAME> 90CC.
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                          87,423
<SECURITIES>                                         0
<RECEIVABLES>                                   69,891
<ALLOWANCES>                                         0
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<CURRENT-ASSETS>                               157,314
<PP&E>                                       5,751,870
<DEPRECIATION>                               4,497,380
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<CURRENT-LIABILITIES>                           23,946
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                                0
                                          0
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<OTHER-SE>                                   1,387,858
<TOTAL-LIABILITY-AND-EQUITY>                 1,411,804
<SALES>                                        661,475
<TOTAL-REVENUES>                               668,217
<CGS>                                                0
<TOTAL-COSTS>                                  562,477
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                105,740
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            105,740
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   105,740
<EPS-PRIMARY>                                    13.90
<EPS-DILUTED>                                        0
        

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