PETROCORP INC
10-Q, 1999-05-17
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                   FORM 10-Q


[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934


                 For the Quarterly period ended March 31, 1999

                                      OR


[_]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934


              For the Transition period ___________ to __________


                        Commission File Number 0-22650

                            PETROCORP INCORPORATED
            (Exact name of registrant as specified in its charter)


              Texas                                   76-0380430
   (State or Other Jurisdiction of       (I.R.S. Employer Identification No.)
   Incorporation or Organization)


    16800 Greenspoint Park Drive                     77060-2391
      Suite 300, North Atrium                        (Zip Code)
          Houston, Texas
(Address of Principal Executive Offices)


      Registrant's Telephone Number, Including Area Code: (281) 875-2500

                                Not Applicable
           (Former Name, Former Address and Former Fiscal Year, if 
                          changed since last report)

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 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 the number of shares outstanding of each of the Registrant's classes of
stock, as of April 30, 1999:


     Common Stock, $.01 per value                            8,656,019
     ----------------------------                            ---------
           (Title of Class)                       (Number of Shares Outstanding)
<PAGE>
 
                            PETROCORP INCORPORATED

                                     INDEX
                                     -----



                                                                        PAGE NO.
                                                                        --------


PART I.  FINANCIAL INFORMATION

Item 1.  Financial Statements.

    Consolidated Balance Sheets at March 31, 1999 and December 31, 1998       1


    Consolidated Statement of Operations for the three months ended 
    March 31, 1999 and 1998                                                   2

    Consolidated Statement of Cash Flows for the three months ended 
    March 31, 1999 and 1998                                                   3

    Notes to Consolidated Financial Statements                                4

Item 2.  Management's Discussion and Analysis of Financial Condition 
         and Results of Operations                                            7

Item 3.  Quantitative and Qualitative Disclosures about Market Risk          12

PART II. OTHER INFORMATION                                                   13

SIGNATURES                                                                   14
<PAGE>
 
PART I.  FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS

                            PETROCORP INCORPORATED
                          CONSOLIDATED BALANCE SHEETS
                     (in thousands, except share amounts)
<TABLE> 
<CAPTION> 

                                                                        MARCH 31,   December 31,
                                                                          1999          1998
                                                                        ---------     ---------
                            ASSETS                                     (UNAUDITED)
<S>                                                                    <C>           <C> 
Current assets:
  Cash and cash equivalents                                             $   6,855     $   7,786
  Accounts receivable, net                                                  3,647         4,569
  Other current assets                                                        315           326
                                                                        ---------     ---------
    Total current assets                                                   10,817        12,681
                                                                        ---------     ---------
Property, plant and equipment:
  Proved oil and gas properties, at cost, full cost method, net
    of accumulated depreciation, depletion and amortization                62,541        64,179
  Unproved oil and gas properties, not subject to depletion                 9,284         9,151
  Plant and related facilities, net                                         3,619         3,768
  Other, net                                                                1,013         1,144
                                                                        ---------     ---------
                                                                           76,457        78,242
                                                                        ---------     ---------
Deferred income taxes                                                      13,548        12,761
Other assets, net                                                             373           308
                                                                        ---------     ---------
    Total assets                                                        $ 101,195     $ 103,992
                                                                        =========     =========
                 LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
  Accounts payable                                                      $   3,405     $   4,424
  Accrued liabilities                                                       2,516         3,467
  Current portion of long-term debt                                         2,723         2,710
                                                                        ---------     ---------
    Total current liabilities                                               8,644        10,601
                                                                        ---------     ---------
Long-term debt                                                             47,249        47,305
                                                                        ---------     ---------
Deferred revenue                                                              172           257
                                                                        ---------     ---------
Deferred income taxes                                                       5,114         5,085
                                                                        ---------     ---------
Commitments and contingencies (Note 6)
Shareholders' equity:
  Preferred stock, $0.01 par value, 1,000,000 shares authorized,
   none issued
  Common stock, $0.01 par value, 25,000,000 shares authorized,
   8,656,019 shares issued and outstanding as of March 31, 1999
   and December 31, 1998                                                       87            87
  Additional paid-in capital                                               71,245        71,245
  Accumulated deficit                                                     (25,445)      (24,324)
  Accumulated other comprehensive loss                                     (5,871)       (6,264)
                                                                        ---------     ---------
    Total shareholders' equity                                             40,016        40,744
                                                                        ---------     ---------
    Total liabilities and shareholders' equity                          $ 101,195     $ 103,992
                                                                        =========     =========
</TABLE> 
  The accompanying notes are an integral part of these financial statements.

                                       1
<PAGE>

                            PETROCORP INCORPORATED
                     CONSOLIDATED STATEMENT OF OPERATIONS
                   (in thousands, except per share amounts) 
                                  (Unaudited)

                                                   For the three months
                                                      ended March 31, 
                                                   --------------------
                                                     1999        1998
                                                   --------    --------
REVENUES:
  Oil and gas                                      $  4,941    $  6,173
  Plant processing                                      454         343
  Other                                                  10         (10)
                                                   --------    --------
                                                      5,405       6,506
                                                   --------    --------
EXPENSES:
  Production costs                                    1,611       1,789
  Depreciation, depletion and amortization            2,693       3,951
  General and administrative                          1,054       1,178
  Restructuring costs                                 1,090
  Other operating expenses                               63          38
                                                   --------    --------
                                                      6,511       6,956
                                                   --------    --------
LOSS FROM OPERATIONS                                 (1,106)       (450)
                                                   --------    --------
OTHER INCOME (EXPENSES):
  Investment and other income                            88          92
  Interest expense                                     (935)       (864)
  Other expenses                                         (1)         (3)
                                                   --------    --------
                                                       (848)       (775)
                                                   --------    --------
LOSS BEFORE INCOME TAXES                             (1,954)     (1,225)
Income tax benefit                                     (833)       (589)
                                                   --------    --------
NET LOSS                                           $ (1,121)   $ (  636)
                                                   ========    ========
Net loss per common share - basic                  $  (0.13)   $  (0.07)
                                                   ========    ========
Net loss per common share - diluted                $  (0.13)   $  (0.07)
                                                   ========    ========

Weighted average number of common shares - basic      8,656       8,592

Weighted average number of common shares - diluted    8,667       8,682


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

                                       2
<PAGE>

                            PETROCORP INCORPORATED
                     CONSOLIDATED STATEMENT OF CASH FLOWS
                                (in thousands)
                                  (Unaudited)

                                                           For the three months
                                                              ended March 31, 
                                                           --------------------
                                                             1999        1998
                                                           --------    --------
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss                                                 $ (1,121)   $   (636)
  Adjustments to reconcile net loss to net
   cash provided by operating activities:
     Depreciation, depletion and amortization                 2,693       3,951
     Deferred income tax benefit                               (833)       (589)
                                                           --------    --------
                                                                739       2,726
     Change in operating assets and liabilities:
       Accounts receivable                                      922       1,873
       Other current assets                                      11          38
       Accounts payable                                      (1,019)     (1,471)
       Accrued liabilities                                     (951)        347
     Other                                                      (85)       (126)
                                                           --------    --------
       NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES     (383)      3,387
                                                           --------    --------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Proceeds from sale of oil and gas properties                              977
  Additions to oil and gas properties                          (345)     (5,482)
  Additions to plant and related facilities                     (37)        (36)
  Additions to other property, plant and equipment               (5)        (48)
  Additions to other assets                                     (81)
                                                           --------    --------
       NET CASH USED IN INVESTING ACTIVITIES                   (468)     (4,589)
                                                           --------    --------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from long-term debt                                  132          82
  Repayment of long-term debt                                  (231)     (2,193)
                                                           --------    --------
       NET CASH USED IN FINANCING ACTIVITIES                    (99)     (2,111)
                                                           --------    --------
Effect of exchange rate changes on cash                          19           8
                                                           --------    --------
Net decrease in cash and cash equivalents                      (931)     (3,305)
Cash and cash equivalents at beginning of period              7,786       9,391
                                                           --------    --------
CASH AND CASH EQUIVALENTS AT END OF PERIOD                 $  6,855    $  6,086
                                                           ========    ========


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

                                       3
<PAGE>
 
                            PETROCORP INCORPORATED
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                  (Unaudited)


NOTE 1 - BASIS OF PRESENTATION:

  The unaudited consolidated financial statements of PetroCorp Incorporated (the
"Company" or "PetroCorp") have been prepared in accordance with generally
accepted accounting principles for interim financial information and with
instructions to Form 10-Q and Rule 10-01 of Regulation S-X.  Accordingly, they
do not include all of the information and footnotes required by generally
accepted accounting principles for complete financial statements.  In the
opinion of management, all adjustments, consisting of normal and recurring
adjustments necessary for a fair presentation, have been included.  For further
information, refer to the consolidated financial statements and footnotes
thereto for the year ended December 31, 1998, included in the Company's 1998
Annual Report on Form 10-K pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934.  Interim period results are not necessarily indicative of
results of operations or cash flows for a full-year period.

NOTE 2 - RESTRUCTURING:

  On November 16, 1998, the Company announced that its Board of Directors had
retained CIBC Oppenheimer Corp. to advise it with respect to strategic
alternatives available to the Company for maximizing shareholder value,
including sales of some or all of the Company's assets or a merger,
reorganization or other restructuring of the Company.

  As part of its goal of maximizing shareholder value, the Company also
announced that its Board of Directors has adopted a Shareholder Rights Plan. The
newly adopted Shareholder Rights Plan is designed to protect the shareholder
against any effort to acquire the Company for less than its full value. However,
the Plan does not prevent a takeover. The intention of the Plan is to enable
shareholders to realize the long-term value of their investments and to enable
the Board of Directors to serve the interests of all shareholders.  Under the
Plan, each shareholder of record at the close of business on November 23, 1998,
received one Series A Preferred Stock Purchase Right (Right) for each share of
Common Stock held. The Rights expire on November 12, 2008.

  The Company opened a data room in February, 1999 and to date has received
expressions of interest from third parties to purchase certain assets of, or
merge with, the Company. The Board of Directors and management are currently
assessing and evaluating the specific terms of these offers. At this time, it is
not possible to determine the likelihood that a possible transaction with one or
more of these third parties would be pursued, or that another course of action
would ultimately be followed.

  The Company recorded a $1.1 million restructuring charge, included in the
accompanying consolidated statement of operations, in the first quarter of 1999
related to the Company's pursuit of strategic alternatives to maximize
shareholder value.  Included in this charge are retention costs along with
severance pay related to a 20% reduction in personnel.

                                       4
<PAGE>
 
NOTE 3 - COMPREHENSIVE INCOME OR LOSS:

  The Company implemented Statement of Financial Accounting Standards No. 130,
"Reporting Comprehensive Income," effective January 1, 1998.  This statement
establishes new requirements for reporting comprehensive income or loss  and the
components which include the Company's foreign currency translation.  Adoption
of this statement has no impact on the Company's net loss as presented on the
accompanying consolidated statement of operations.  The Company's comprehensive
loss for the three months ended March 31, 1999 and 1998 are as follows (amounts
in thousands):

                                                   For the three
                                                    months ended
                                                      March 31,
                                                 -------------------
                                                   1999       1998
                                                 --------   --------
                                 
Net loss                                         $(1,121)     $(636)
Foreign currency translation gain                    393        186
                                                 -------      -----
Comprehensive loss                               $  (728)     $(450)
                                                 =======      =====

NOTE 4 - PROPERTY, PLANT AND EQUIPMENT:

  The Company accounts for its oil and gas properties using the full cost
accounting rules promulgated by the Securities and Exchange Commission whereby
all productive and nonproductive exploration and development costs incurred for
the purpose of finding oil and gas reserves are capitalized.  Such capitalized
costs include lease acquisition, geological and geophysical work, delay rentals,
drilling, completing and equipping oil and gas wells, together with internal
costs directly attributable to property acquisition, exploration and development
activities.  No gains or losses are recognized upon the sale or other
disposition of oil and gas properties, except in unusually significant
transactions.

  The costs of the Company's oil and gas properties, including estimated future
development and dismantlement costs, are depreciated on a country-by-country
basis using a composite unit-of-production rate.  An additional valuation
adjustment is made on a country-by-country basis if net capitalized costs of the
Company's oil and gas properties exceed the capitalization ceiling, which is
calculated on a quarterly basis as the sum of (1) the present value (10%) of
future net revenues from estimated production of proved oil and gas reserves
plus (2) the lower of cost or estimated fair value of the unproved properties,
less (3) the related income tax effects.

  Product prices continue to be volatile though increasing since year-end.
Companies that follow the full cost accounting method are required to make the
quarterly "ceiling test" calculations using product prices in effect at that
time.  In the future, should product prices decline significantly and depending
on drilling results, the Company could be required to record a valuation
adjustment to its oil and gas property balances, resulting in a non-cash charge
against earnings.

NOTE 5 - DEFERRED REVENUE:

  In March 1996, the Company sold its SW Oklahoma City Field gas gathering
system for $3.8 million.  The Company's total gain on the sale was $3.1 million,
with $1.0 million being recognized in the first quarter of 1996 in "investment
and other income" on the consolidated statement of operations while the
remaining $2.1 million of the gain was  deferred.  The $2.1 

                                       5
<PAGE>
 
million deferred revenue will be recognized in future periods as a component of
gas revenues by partially offsetting the gas gathering fees paid by the Company
over the productive life of the Company's SW Oklahoma City Field. Through March
31, 1999, $1.9 million has been recognized, leaving a balance of $172,000 in
"deferred revenue" on the consolidated balance sheet as of March 31, 1999.

NOTE 6 - COMMITMENTS AND CONTINGENCIES:

  There are claims and actions pending against the Company.  In the opinion of
management, the amounts, if any, which may be awarded in connection with any of
these claims and actions would not be material to the Company's consolidated
financial position or results of operations.

                                       6
<PAGE>
 
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS.

GENERAL

  The Company's principal line of business is the production and sale of its oil
and natural gas reserves located in North America.  Results of operations are
dependent upon the quantity of production and the price obtained for such
production.  Prices received by the Company for the sale of its oil and natural
gas have fluctuated significantly from period to period.  Such fluctuations
affect the Company's ability to maintain or increase its production from
existing oil and gas properties and to explore, develop or acquire new
properties.

  The following table reflects certain operating data for the periods presented:
<TABLE> 
<CAPTION>
                                                                      For the three
                                                                      months ended
                                                                        March  31,
                                                                    ------------------
                                                                     1999        1998
                                                                    ------      ------
<S>                                                                <C>         <C> 
     PRODUCTION:
         United States:
             Oil (MBbls).......................................         88         121
             Gas (MMcf)........................................      1,236       1,164
             Gas equivalents (MMcfe)...........................      1,764       1,890
         Canada:                                                     
             Oil (MBbls).......................................         33          32
             Gas (MMcf)........................................      1,079       1,102
             Gas equivalents (MMcfe)...........................      1,277       1,294
         Total:                                                      
             Oil (MBbls).......................................        121         153
             Gas (MMcf)........................................      2,315       2,266
             Gas equivalents (MMcfe)...........................      3,041       3,184

     AVERAGE SALES PRICES:
         United States:
             Oil (per Bbl).....................................     $11.01      $14.42
             Gas (per Mcf).....................................       1.76        2.20
         Canada:                                                     
             Oil (per Bbl).....................................      10.99       12.88
             Gas (per Mcf).....................................       1.32        1.32
         Weighted average:                                           
             Oil (per Bbl).....................................      11.00       14.10                
             Gas (per Mcf).....................................       1.56        1.77

     SELECTED DATA PER MCFE:
         Average sales price...................................     $ 1.62      $ 1.94
         Production costs......................................       0.53        0.56
         General and administrative expenses...................       0.35        0.37
         Oil and gas depreciation, depletion and amortization..       0.76        1.11
</TABLE> 

                                       7
<PAGE>
 
RESTRUCTURING

  On November 16, 1998, the Company announced that its Board of Directors had
retained CIBC Oppenheimer Corp. to advise it with respect to strategic
alternatives available to the Company for maximizing shareholder value,
including sales of some or all of the Company's assets or a merger,
reorganization or other restructuring of the Company.

  As part of its goal of maximizing shareholder value, the Company also
announced that its Board of Directors has adopted a Shareholder Rights Plan. The
newly adopted Shareholder Rights Plan is designed to protect the shareholder
against any effort to acquire the Company for less than its full value. However,
the Plan does not prevent a takeover. The intention of the Plan is to enable
shareholders to realize the long-term value of their investments and to enable
the Board of Directors to serve the interests of all shareholders.  Under the
Plan, each shareholder of record at the close of business on November 23, 1998,
received one Series A Preferred Stock Purchase Right (Right) for each share of
Common Stock held. The Rights expire on November 12, 2008.

  The Company opened a data room in February, 1999 and to date has received
expressions of interest from third parties to purchase certain assets of, or
merge with, the Company. The Board of Directors and management are currently
assessing and evaluating the specific terms of these offers. At this time, it is
not possible to determine the likelihood that a possible transaction with one or
more of these third parties would be pursued, or that another course of action
would ultimately be followed.

ACQUISITIONS

  In June 1998, the Company acquired a position in a South Texas exploration and
development drilling alliance (the South Texas Acquisition).  The acquisition
includes a working interest in the new discovery well in the Rich Hurt Field in
western Duval County. The alliance also controls approximately 25,000 acres in
Duval and Webb counties as well as the rights to more than 100 square miles of
new 3-D seismic data over the area.

  The acquired Rich Hurt discovery well, along with three subsequently drilled
development wells, were producing at a combined rate of approximately 13 MMcf/D
at March 31, 1999.  PetroCorp's net share of this production is approximately
1.7 MMcf/D.  Additionally, the Company is currently completing a new well on its
Ruidoso prospect in the area.  The alliance has identified more than 80
prospects/leads in this South Texas area and currently has a leasehold position
over 35 of these ideas.

RESULTS OF OPERATIONS

 Three Months Ended March 31, 1999 Compared to Three Months Ended March 31, 1998

  Overview.  The Company recorded a first quarter 1999 net loss of $439,000, or
$0.05 per share, before  restructuring charges.  This compares to a net loss of
$636,000, or $0.07 per share, recorded in the first quarter of 1998.  This
improvement results from lower operating expenses, though oil and gas prices
declined 16% per Mcfe.  The Company recorded a $1.1 million ($682,000 after-tax)
restructuring charge in the first quarter of 1999.  Excluding the restructuring
charge, the Company's cash flow before changes in operating assets and
liabilities decreased 33% to $1.8 million as a result of the lower prices.

  Revenues.  Total revenues decreased 17% to $5.4 million in the first quarter
of 1999 compared to $6.5 million in the first quarter of 1998.  The Company's
natural gas production increased 2% to 2,315 MMcf 

                                       8
<PAGE>
 
from 2,266 MMcf but was more than offset by a 21% decline in oil production to
121 MBbls from 153 Mbbls, resulting in the Company's overall production
declining 4% to 3,041 MMcfe from 3,184 MMcfe. The increase in natural gas
production reflects the impact of the South Texas Acquisition completed in June
1998 coupled with increases resulting from new wells in Canada. The decline in
oil production reflects normal production declines and the deferment of drilling
and workover operations during a period of low oil prices.

  The Company's composite average oil price decreased 22% to $11.00 per barrel
in the first quarter of 1999 from $14.10 per barrel in the first quarter of
1998.  The Company's average U.S. natural gas price decreased 20% to $1.76 per
Mcf in the first quarter of 1999 from $2.20 per Mcf in the prior year quarter,
while the average Canadian natural gas price remained level at $1.32 per Mcf.
The significant decline in prices coupled with the modest decline in production
volumes resulted in a 20% decrease in oil and gas revenues to $4.9 million in
the first quarter of 1999 from $6.2 million in the prior year quarter.

  Production Costs.  Production costs decreased 10% to $1.6 million in the first
quarter of 1999 as a result of lower U.S. production taxes and the Company's
cost reduction efforts.  Production costs per Mcfe decreased 5% to $0.53 per
Mcfe.

  Depreciation, Depletion & Amortization (DD&A).  Total DD&A decreased 32% to
$2.7 million in the first quarter of 1999 from $4.0 million in the first quarter
of 1998.  The decrease reflects the impact of a lower U.S. DD&A rate resulting
from a U.S. oil and gas property valuation adjustment recorded in the fourth
quarter of 1998.  The composite oil and gas DD&A rate also decreased 32% to
$0.76 per Mcfe from $1.11 per Mcfe.

  General and Administrative Expenses.  General and administrative expenses
decreased 11% to $1.1 million in the first quarter of 1999 from $1.2 million in
the first quarter of 1998 as a result of the Company's focus on reducing costs.

  Restructuring Costs.  The Company recorded a $1.1 million restructuring charge
in the first quarter of 1999 related to the Company's pursuit of strategic
alternatives to maximize shareholder value.  Included in this charge are
retention costs along with severance pay related to a 20% reduction in
personnel.

  Investment and Other Income.  Investment and other income decreased 4% to
$88,000 in the first quarter of 1999 from $92,000 in the first quarter of 1998.

  Interest Expense.  Interest expense increased 8% to $935,000 in the first
quarter of 1999 from $864,000 in the prior year quarter, reflecting the impact
of increased debt associated with the South Texas Acquisition completed in June
1998.

  Income Taxes.  The Company recorded a $833,000 income tax benefit with an
effective tax rate of 43% on a pre-tax loss of $2.0 million in the first quarter
of 1999.  This compares to an income tax benefit of $589,000 with an effective
tax rate of 48% on a pre-tax loss of $1.2 million in the first quarter of 1998.

LIQUIDITY AND CAPITAL RESOURCES

  The Company has historically funded its capital expenditures and working
capital requirements with its cash flow from operations, debt and equity capital
and participation by institutional investors. As of March 31, 1999, the Company
had working capital of $2.2 million as compared to $2.1 million at December 31,
1998. Excluding the $1.1 million restructuring charge in the first quarter of
1999, cash provided by operating activities before changes in operating assets
and liabilities were $1.8 million and $2.7 million for the quarters ended March
31, 1999 and 1998, respectively.

                                       9
<PAGE>
 
  The Company's total capital expenditures, including capitalized internal
costs, were $468,000 and $5.6 million for the quarters ended March 31, 1999 and
1998, respectively.

  No oil and gas property sales occurred in the first quarter of 1999 while
sales of non-strategic properties totaled $977,000 in the first quarter of 1998.

  In March 1996, the Company sold its SW Oklahoma City Field gas gathering
system for $3.8 million. The Company's total gain on the sale was $3.1 million,
with $1.0 million being recognized in the first quarter of 1996 in ''investment
and other income'' on the consolidated statement of operations while the
remaining $2.1 million of the gain was deferred. The $2.1 million deferred
revenue will be recognized in future periods as a component of gas revenues by
partially offsetting the gas gathering fees paid by the Company over the
productive life of the Company's SW Oklahoma City Field. Through March 31, 1999,
$1.9 million has been recognized, leaving a balance of $172,000 in ''deferred
revenue'' on the consolidated balance sheet as of March 31, 1999.

  In June 1997, the Company entered into a $50.0 million five-year revolving
credit agreement with the Toronto-Dominion Bank, the agent, and the Bank of Nova
Scotia. On June 30, 1997, the Company was advanced $13.0 million to fund an
acquisition of producing properties completed in early July 1997 and to fund
certain debt repayments. During 1998, the Company borrowed $12.0 million to fund
additional acquisitions and other debt repayments. At March 31, 1999, the
Company had a total of $25.0 million outstanding under the revolver. The
facility was amended in June 1998 to extend the initial five-year term an
additional year to July 1, 2003 with quarterly borrowing base amortization
beginning September 30, 2001. The borrowings can be funded by either Eurodollar
loans or Prime loans. The interest rate on the borrowings is equal to an
interest rate spread plus either the Eurodollar rate or the Prime rate. The
interest spread is determined from a sliding scale based on the Company's
borrowing base percentage utilization in effect from time to time. The spread
ranges from 7/8% to 1 1/2% on Eurodollar loans and nil to 1/2% on Prime loans.
The Company's average interest rate under this facility was approximately 6.4%
during the first quarter of 1999.

  On December 30, 1996, the Company, through a wholly-owned Canadian subsidiary,
entered into a long-term borrowing agreement with the Royal Bank of Canada (RBC)
whereby the Company borrowed $3.5 million to partially fund the December 1996
acquisition of Millarville Oil and Gas Ltd., a privately held Alberta
corporation that owns and operates oil and gas properties in Alberta, Canada. On
June 29, 1998, this loan was repaid and the agreement was terminated. The
Company's average interest rate while the loan remained outstanding in 1998 was
6.6%.

  In July 1993, PetroCorp issued $40.0 million in senior notes. The Note
Purchase Agreement established $10.0 million of Senior Adjustable Rate Notes
Series A, due June 30, 1999 (the Series A Notes), payable to a subsidiary of
USF&G Corporation (a 20% shareholder of the Company), and $30.0 million of 7.55%
Senior Notes Series B, due June 30, 2008 (the Series B Notes), payable to two
wholly-owned subsidiaries of CIGNA Corporation (formerly an 18% shareholder of
the Company) and to four unaffiliated institutional investors in amounts
totaling $20.0 million and $10.0 million, respectively. Mandatory redemptions
commenced on December 31, 1994 for the Series A Notes and commenced on December
31, 1995 for the Series B Notes. As of March 31, 1999, the remaining principal
balances for the Series A and B Notes were $875,000 and $20.3 million,
respectively. Of the total $21.2 million, $3.8 million matures in the next
twelve months. Interest on the Series A Notes is adjustable, based on a spread
of 115 basis points over the London Interbank Offered Rate (LIBOR). The Company
may select a rate which may be applicable for a one-, three- or six-month
period. Interest is payable in arrears at the end of the selected period.
Interest on the Series B Notes is fixed at a rate of 7.55% and is payable
semiannually in arrears.

  The Note Purchase Agreement contains provisions that limit the Company's debt
levels based on undiscounted and discounted oil and gas reserves using the SEC's
rules, including the use of year-end prices 

                                       10
<PAGE>
 
held constant over the life of the remaining reserves. Due to low oil and gas
prices, the Company was not in compliance with certain debt covenants of the
Series A and Series B Note Purchase Agreement at year-end. However, the Series A
and Series B note holders have waived such provisions until January 1, 2000.

  As the Company has both the ability and intent to refinance $2.0 million of
its current maturities of long-term debt utilizing its revolving credit
facility, $2.0 million has been reclassified from ''current'' to ''long-term''
on the Company's accompanying consolidated balance sheet as of March 31, 1999.

  The Company's Canadian subsidiary redeemed its redeemable preferred stock on
August 9, 1994 for $7.0 million and simultaneously issued $7.0 million in
nonrecourse long-term notes payable with similar financial terms. At March 31,
1999, the nonrecourse long-term notes payable balance was $3.8 million, of which
$923,000 was classified as "current."

  Product prices continue to be volatile. Under rules promulgated by the
Securities and Exchange Commission, companies that follow the full cost
accounting method are required to make quarterly "ceiling test" calculations, by
country, using product prices in effect at that time (see Note 4 to the
Consolidated Financial Statements--Property, Plant and Equipment).  In the
future, should prices decline significantly and depending on drilling results,
the Company could be required to record a valuation adjustment to its oil and
gas property balances, resulting in a future non-cash charge against earnings.

  The Company plans to finance its substantially reduced 1999 capital
expenditures solely from available cash flow from operations and working
capital. If the Company increases its capital expenditure level in the future,
capital expenditures may require additional funding, obtained through borrowings
from commercial banks and other institutional sources, public offerings of
equity or debt securities and existing and future relationships with
institutional investment partners.

YEAR 2000 ISSUES

  The Year 2000 presents significant issues for many computer systems. Much of
the software in use today may not be able to accurately process data beyond the
year 1999. The vast majority of computer systems process transactions using two
digits for the year of the transaction, rather than the full four digits, making
such systems unable to distinguish January 1, 2000 from January 1, 1900. Such
systems may encounter significant processing inaccuracies or become inoperable
when Year 2000 transactions are processed. Such matters could not only impact
the Company in its day-to-day operations but also impact the Company's financial
institutions, customers and vendors as well as state, provincial and federal
governments with jurisdictions where the Company maintains operations.

  PetroCorp has formed a Year 2000 compliance team and has been addressing Year
2000 issues since the fourth quarter of 1997. The Company's initial focus was on
internal business systems and processes. Beginning in August 1998, PetroCorp
expanded its focus to include its oil and gas operations systems and processes
as well as assessing the readiness of its key business partners (financial
institutions, customers, vendors, oil and gas operators, etc.).

  It has been a PetroCorp strategy to use, wherever possible, industry prevalent
products and processes with minimal customization. As a result, PetroCorp does
not expect any extensive in-house hardware, software or process conversions in
an effort to be Year 2000 compliant nor does PetroCorp expect its Year 2000
compliance related costs to be material to the Company's operations. PetroCorp
has contacted its major information technology suppliers concerning their Year
2000 compliance status and is continuing to test (using available software
tools) these systems for compliance.

                                       11
<PAGE>
 
  The Company's goal is to be Year 2000 compliant by June 30, 1999 and have
contingency plans in place, wherever possible, when compliance is not probable
in a timely manner.

  While it is PetroCorp's goal to be Year 2000 compliant, there can be no
assurance that there will not be a material adverse effect on the Company as a
result of a Year 2000 related issue. The Company believes its business partners
present the area of greatest risk to the Company, in part because of the
Company's limited ability to influence actions of third parties, and in part
because of the Company's inability to estimate the level and impact of
noncompliance of third parties. Additionally, there are many variables and
uncertainties associated with judgments regarding any contingency plans
developed by the Company.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

  The Company's primary sources of market risk are from fluctuations in
commodity prices, interest rates and exchange rates.

 Commodity Price Risk

  The Company produces and sells natural gas, crude oil, condensate, natural gas
liquids and sulfur. As a result, the Company's financial results can be
significantly affected as these commodity prices fluctuate widely in response to
changing market forces. Prior to 1997, the Company utilized hedging transactions
to manage its exposure to price fluctuations on its sales of oil and natural
gas.  No hedge transactions were in place in 1998 and 1997.

 Interest Rate Risk

  Total debt at March 31, 1999, included $24.1 million of fixed-rate debt
attributed to Series B Senior Notes and Nonrecourse Notes Payable, and $25.9
million of floating-rate debt attributed to Series A Senior Notes and the TD
Bank Credit Agreement.  As a result, the Company's annual interest cost in 1999
will fluctuate based on short-term interest rates. The impact on annual cash
flow of a 100 basis point change in the floating rate would be approximately
$184,000.

  At March 31, 1999, the Company's fixed rate Series B Senior Notes had a book
value of $20.8 million and a fair market value of $26.5 million. Due to the
nature of the Nonrecourse Notes Payable, the Company believes that it is not
practicable to estimate the fair value.

 Foreign Currency Exchange Rate Risk

  The Company conducts a significant portion of its business in the Canadian
dollar and is therefore subject to foreign currency exchange rate risk on cash
flows related to sales, expenses, financing and investing transactions. Exposure
from market rate fluctuations related to activities in Canada, where the
Company's functional currency is the Canadian dollar, is not material at this
time.

                                       12
<PAGE>
 
PART II.  OTHER INFORMATION

Item 1 - Legal Proceedings

     Not Applicable


Item 2 - Changes in Securities

     Not Applicable


Item 3 - Defaults upon Senior Securities

     Not Applicable


Item 4 -  Submission of Matters to Vote of Security Holders

     Not Applicable


Item 5 - Other Information

     Not Applicable


Item 6 -

     (a)  Exhibits

          3.1*  Amended and Restated Articles of Incorporation of PetroCorp
                Incorporated.  Incorporated by reference to Exhibit 3.2 to the
                Registration Statement on Form S-1 (Registration No. 33-36972)
                initially filed with the Securities and Exchange Commission on
                August 26, 1993 (the "Registration Statement").

          3.2*  Amended and Restated Bylaws of PetroCorp Incorporated.
                Incorporated by reference to Exhibit 3.2 to the Form 10-Q for
                the quarterly period ended June 30, 1996.

          10.1  PetroCorp Incorporated Executive Severance Plan.

          27    Financial Data Schedule
          ______________________________
          * Incorporated by reference.


     (b)  Reports on Form 8-K

          Not Applicable

                                       13
<PAGE>
 
                                  SIGNATURES

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.


                             PETROCORP INCORPORATED
                             (Registrant)



Date:  May 14, 1999          /s/ CRAIG K. TOWNSEND
                             -------------------------------------------------
                             Craig K. Townsend
                             Vice President - Finance, Secretary and Treasurer
                             (On behalf of the Registrant and as the
                             Principal Financial Officer)

                                       14

<PAGE>
 
================================================================================

                             PETROCORP INCORPORATED

                            EXECUTIVE SEVERANCE PLAN


                   PLAN DOCUMENT AND SUMMARY PLAN DESCRIPTION

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS

 
 
Paragraph                                                               Page
- ---------                                                               ----- 
 1.   PURPOSE OF PLAN...............................................      1
 2.   EFFECTIVE DATE................................................      1
 3.   ELIGIBILITY...................................................      1
 4.   SCHEDULE OF BENEFITS..........................................      3
 5.   RELEASE OF LIABILITY..........................................      5
 6.   SOURCE OF BENEFITS............................................      5
 7.   NON-ASSIGNMENT OF BENEFITS....................................      5
 8.   EFFECT OF DEATH ON BENEFITS...................................      5
 9.   MAKING A CLAIM................................................      5
10.   AMENDMENT OR TERMINATION OF THE PLAN..........................      7
11.   MISCELLANEOUS.................................................      7
12.   YOUR RIGHTS UNDER ERISA.......................................      8
13.   GENERAL INFORMATION...........................................      9
 
                                       i
<PAGE>
 
                             PETROCORP INCORPORATED

                          EXECUTIVE SEVERANCE PLAN AND
                            SUMMARY PLAN DESCRIPTION


1.   PURPOSE OF PLAN

     The purpose of the PetroCorp Executive Severance Plan (the "Plan") is to
     provide severance benefits to a select group of management or highly
     compensated employees of PetroCorp Incorporated (the "Company").

2.   EFFECTIVE DATE

     This Plan is effective as of November 1, 1998 (the "Effective Date").

3.   ELIGIBILITY

     (a)  Eligible Employees.  You are eligible for severance benefits under the
          Plan if you meet all of the following conditions:

          (1)  you are an executive officer of the Company, on the payroll
               maintained in the United States and your principal office is in
               the United States,

          (2)  you are not covered under a written employment agreement with the
               Company which provides for a form of severance remuneration upon
               termination of employment, and

          (3)  your employment is involuntarily and permanently terminated for
               any reason other than for cause (defined below) or any of the
               other reasons set forth below in paragraphs 3(b) and 3(c) during
               the term of the Plan or during the 12-month period immediately
               following the termination of the Plan.

          All officers of the Company who are eligible for benefits under the
          Plan are set forth in Appendix B attached hereto.

          Cause means (i) your willful failure to perform substantially all of
          your duties with the Company (other than any such failure resulting
          from your incapacity due to physical or mental illness); (ii) your
          willful engaging in conduct which is not authorized by the Company or
          within the normal scope or course of your duties with the Company and
          the Company determines that such conduct is, or in the future could
          be, materially detrimental to the best interests of the Company or any
          of its owners or subsidiaries, or (iii) your willful engaging in
          illegal conduct or any act of dishonesty which the Company determines
          is, or in the future could be, materially detrimental to the best
          interests of the Company or any of its owners or subsidiaries.  No
          act, or failure to act, on your part shall be considered "willful"
<PAGE>
 
          unless the Company determines that such act was done, or omitted to be
          done, by you in bad faith and without reasonable belief that your
          action or omission was in, or not opposed to, the best interests of
          the Company.  Any such determination made hereunder by the Company in
          good faith shall be final and conclusive as to your rights under the
          Plan.

     (b)  Voluntary Termination.  If you voluntarily terminate your employment
          with the Company (including, without limitation, resign, abandon your
          job, fail to timely return from an approved leave of absence, retire
          prior to, on, or after attaining age 65 or otherwise initiate your
          termination of employment), you will not be eligible for severance
          benefits under the Plan.

          Your termination will not be considered voluntary in the event that
          any of the following shall occur without your written consent:

          (1)  a material change in your duties or responsibilities, or a change
               in your reporting relationships, either of which results in or
               reflects a substantial diminution of the scope or importance of
               your duties and responsibilities;

          (2)  a reduction of more than ten (10%) percent in your current annual
               base pay (as defined in paragraph 4 below);

          (3)  a material reduction in the level of benefits available or
               awarded under employee benefit plans and programs other than any
               severance or retention pay plan; or

          (4)  a relocation of your primary employment location to a location
               that is more than 35 miles from your current location.

     (c)  Other Events or Circumstances that Prevent Payment of Severance
          Benefits.  You will not receive any severance benefits under the Plan
          if any of the following events or circumstances apply to you:

          (1)  if you refuse to accept and agree to a transfer of employment at
               your same base pay and substantially the same benefits and
               responsibilities (as further defined in paragraphs 3.(b)(1), (2)
               and (3) above) and to any owner of the Company or purchaser of a
               substantial portion of the Company's assets and your new location
               of employment is within 35 miles of your current location of
               employment;

          (2)  if termination of your employment occurs more than one year
               following termination of the Plan; or

          (3)  if special circumstances (including, but not limited to, payment
               of sick leave or disability benefits prior to termination of your
               employment) exist for which the Company makes a determination,
               pursuant to guidelines 

                                       2
<PAGE>
 
               adopted by the Company, that a severance benefits will not be
               payable under the Plan.

4.   SCHEDULE OF BENEFITS

     If you qualify for severance benefits under the Plan, following your timely
     execution and delivery of the release (described in paragraph 5) to the
     Plan Administrator, you will be entitled to the following benefits:
 
     (a)  Severance Pay Benefits. You will be entitled to severance pay equal to
          twelve (12) months of base pay. Your base pay will be your base salary
          or regular rate of pay in effect at the time of termination of your
          employment, excluding incentives, bonuses, commissions, fringe
          benefits. Any performance/merit reviews that are pending or in process
          will not affect the amount of your base pay or severance benefits.
          Within fifteen (15) days after the Company's receipt of an acceptable
          and properly executed release, as provided for in paragraph 5, you
          will receive your severance pay benefits.

          Such benefits shall be paid in a single lump-sum payment or, at your
          election in equal payments over either a twelve (12) or eighteen (18)
          month period. Any such election to receive payments over a twelve or
          eighteen month period must be made either (i) prior to the date upon
          which you are notified of your termination of employment or the date
          upon which an event described in 3(b) occurs; or (ii) prior to your
          date of termination of employment; provided, however, if your election
          date does not also meet the requirements of (i) above, your first
          payment shall not occur sooner than twenty-one (21) days following the
          date of your termination of employment. All subsequent payments shall
          be made on or about the first day of each subsequent month. Any such
          election shall be subject to the consent of the Company and shall be
          irrevocable. In addition, you will not receive any interest on
          deferred payments The Company will withhold from the amount of
          severance pay benefits payable under the Plan, all federal, state and
          local taxes required to be withheld under any applicable law or
          governmental regulation or ruling with respect to any severance
          benefits.

     (b)  Medical and Dental Plan Benefits. You may purchase health benefits for
          yourself, your spouse, and your dependents if you are eligible to do
          so pursuant to the provisions of the Consolidated Omnibus Budget
          Reconciliation Act of 1985, as amended ("COBRA").  Generally, COBRA
          allows you to purchase your health plan coverage for a maximum of
          eighteen months, provided that you pay the full amount of the
          insurance premium (employer as well as employee portions).  As part of
          your severance package, however, for a limited period of time, the
          Company will reimburse you for a portion of the COBRA insurance
          premium equal to the employer portion of the premium paid on your
          behalf during your employment.

          The regular COBRA procedures and rules will apply, and you will be
          required to timely remit the full amount of the COBRA premium to the
          COBRA 

                                       3
<PAGE>
 
          administrator (COBRA-SERV); however, upon submission by you of proof
          of your premium payment, the company will reimburse you for the
          portion of the premium that the Company would have paid for that
          coverage had your employment continued. The Company will reimburse you
          for the employer share of the COBRA premium for up to but not
          exceeding 12 months.

          You MUST elect COBRA coverage if you wish to continue your group
          insurance.  Failure to elect will effectively discontinue your
          insurance benefits through PetroCorp.  You may drop some coverages if
          you wish but you cannot take out new coverages.  For example, you can
          cancel dependent coverage but you may not elect to take dependent
          coverage if you did not carry it immediately before your termination.
          You will have to sign and return forms to COBRA-SERV to begin
          receiving your COBRA premium invoices.  After you elect COBRA
          coverage, you will have approximately 45 days to make your first
          payment and 30 days for subsequent monthly payments.  YOU ARE
          RESPONSIBLE FOR MAKING THESE PAYMENTS DIRECTLY TO COBRA-SERV.
          HOWEVER, AS SOON AS YOU RECEIVE YOUR MONTHLY BILLING FROM COBRA-SERV,
          SEND A COPY TO PETROCORP IMMEDIATELY.  PETROCORP WILL REIMBURSE YOU
          FOR THE EMPLOYER SHARE OF THE COBRA PREMIUM WITHIN TWO WEEKS, FOR AS
          LONG AS YOUR SEVERANCE BENEFITS SPECIFY.  Once the severance benefit
          period has expired, you will be responsible for paying 100% of the
          premium, with no reimbursement from PetroCorp, for as long as your
          COBRA coverage continues.  You may cancel the coverage at any time by
          simply discontinuing your payments.  COBRA-SERV will send a Past-Due
          Notice 15 days after the initial monthly billing.  IF YOU DO NOT MAKE
          YOUR PAYMENT TO COBRA-SERV WITHIN 30 DAYS OF THE INITIAL MONTHLY
          BILLING, YOUR COVERAGE WILL BE CANCELLED AND WILL NOT BE REINSTATED.

     (c)  Outplacement Services. You will be provided outplacement counseling
          services (provided by the Company or the Company's designated
          outplacement service provider) for three (3) days for each year of
          service with the Company. For this purpose, a year of service with the
          Company means any twelve-month period of employment as a regular full-
          time employee of the Company.  Service shall include any period of
          absence from active employment due to temporary illness or authorized
          vacation, or during temporary leaves of absence from active employment
          granted by the Company for reasons of professional advancement,
          education, health, or government service, or during military leave for
          any period if you return to active employment with the Company within
          90 days after the termination of military leave, or during any period
          required to be treated as a leave of absence by virtue of (i) any
          enforceable employment or other agreement or (ii) any applicable law,
          such as the federal Family and Medical Leave Act of 1993.  All
          nonconsecutive periods of service shall be aggregated for purposes of
          calculating your years of service and a partial year of service shall
          be rounded up to the nearest one third (1/3) year of service and the
          days of outplacement services 

                                       4
<PAGE>
 
          will be prorated accordingly. In any event you will be entitled to a
          minimum of ten (10) days of outplacement services.

     (d)  Vacation Benefits. You will be paid for any vacation that you have
          accrued but not taken in the year of your termination plus any
          vacation that you were allowed to carryover to the year of your
          termination. You will be charged for any vacation you have taken but
          not accrued as of your termination date.

5.  RELEASE OF LIABILITY

     As a prior condition to your receipt of any severance benefits under the
     Plan, you must execute and deliver to the Plan Administrator (on or within
     45 days after your termination date) the form attached hereto as Appendix A
     (or a substantially similar form) which is a separate release agreement.

6.  SOURCE OF BENEFITS

     Should you become entitled to a severance benefit under the Plan, it will
     be paid from the general assets of the Company.  Accordingly, you shall
     have the status of an unsecured general creditor of such Company.

7.  NON-ASSIGNMENT OF BENEFITS

     Your benefits or rights under the Plan may not be sold, alienated,
     transferred, assigned, pledged, or encumbered, and any attempt to do so
     shall be void.  No purported assignment or transfer of such benefits or
     rights, whether voluntary or involuntary, by operation of law or otherwise,
     shall vest in the purported assignee or transferee any interest or right
     therein, but immediately upon such purported assignment or transfer (or any
     attempt to make the same), such benefits or rights shall terminate and
     become of no further effect.  Also, no benefit under the Plan shall be
     liable for or subject to the debts, contracts, liabilities, engagements or
     torts of the person entitled to it.  You may not create a lien on or other
     right to any benefits under the Plan, except to the extent permitted by the
     terms of this Plan or by will or the laws of descent and distribution.

8.  EFFECT OF DEATH ON BENEFITS

     If you die before you receive the full amount of any severance benefits
     payable to you under the Plan, benefits shall be paid in a lump sum to your
     surviving spouse, if any, otherwise to your estate.

9.  MAKING A CLAIM

     (a)  How to Submit a Claim.  Benefits under this Plan should be sent to you
          automatically.  If  you have not received your severance benefit
          within thirty (30) days from your termination date, you may file a
          claim for benefits in writing with the Plan Administrator.  Solely for
          purposes of this paragraph, the President of the Company shall be
          deemed the Plan Administrator unless or until the Plan 

                                       5
<PAGE>
 
          Administrator (through its Board of Directors) delegates this
          responsibility to another person.

     (b)  If You Disagree.  If you have made a claim for benefits under this
          Plan and any portion of the claim is denied, the Plan Administrator
          will furnish you with a written notice stating the specific reasons
          for the denial, specific reference to pertinent Plan provisions upon
          which the denial was based, a description of any additional
          information or material necessary to perfect the claim, an explanation
          of why such information or material is necessary, and appropriate
          information concerning steps to take if you wish to submit the claim
          for review.

          Your claim will be deemed denied if the Plan Administrator does not
          approve the claim and fails to notify you within ninety (90) days
          after receipt of your claim, plus any extension of time for processing
          the claim, not to exceed ninety (90) additional days, as special
          circumstances require.  To obtain an extension, the Plan Administrator
          must advise you in writing during the initial ninety (90) days if an
          extension is necessary, stating the special circumstances requiring
          the extension and the date by which you can expect the Plan
          Administrator's decision regarding your claim.

     (c)  Review Procedure.  Within sixty (60) days after the date of written
          notice denying any benefits (or within 60 days after the Plan
          Administrator's failure to approve your claim within the time period
          specified in 10(b) above), you or your authorized representative may
          write to the Plan Administrator requesting a review of that decision.

          Your request for review must contain an explanation of why you believe
          the denial was incorrect and may contain such issues and comments as
          you wish considered in the review.  You may also review pertinent
          documents in the Plan Administrator's possession.  The Plan
          Administrator will make a final determination with respect to your
          claim as soon as practicable.  The Plan Administrator will advise you
          of the determination in writing and will set forth the specific
          reasons for the determination and the specific references to any
          pertinent Plan provisions upon which the determination is based.

          Your claim will be deemed denied on review if the Plan Administrator
          fails to give you written notice of final determination within sixty
          (60) days after receipt of your request for review, plus any extension
          of time for completing the review, not to exceed sixty (60) additional
          days, as special circumstances require.  To obtain an extension, the
          Plan Administrator must advise you in writing during the initial sixty
          (60) days if any extension is necessary, stating the special
          circumstances requiring the extension and the date by which you can
          expect the Plan Administrator's decision regarding the review of your
          claim.

                                       6
<PAGE>
 
10.  AMENDMENT OR TERMINATION OF THE PLAN

     This Plan will automatically terminate four (4) months after the Effective
     Date, unless renewed for an additional period prior to such termination by
     resolution of the Board of Directors of the Company (or its delegate).  The
     Plan Administrator will notify the Plan participants of any such renewal.
     Notwithstanding anything herein to the contrary, the Board of Directors of
     the Company (or its delegate) reserves the right to amend or terminate this
     Plan at any time, with or without advance notice.  The Plan Administrator
     will notify the Plan participants of all approved amendments or of the
     Plan's termination.  Since the Plan is a welfare benefit plan under the
     Employee Retirement Income Security Act of 1974, as amended, ("ERISA") plan
     termination insurance is not required or provided.

11.  MISCELLANEOUS

     (a)  No Employment Agreement.  This Plan does not constitute an employment
          agreement between the Company and you or any other employee covered
          under the Plan.

     (b)  Auxiliary Documents.  By your acceptance of any benefits payable under
          the Plan, you hereby agree to execute any documents which may be
          necessary or proper to carry out the intent and purpose of the Plan.

     (c)  Governing Law.  To the extent not preempted by federal law, this Plan
          shall be interpreted under the laws of the State of Texas.

     (d)  Other Contacts.  Your rights under this Plan shall not be affected by
          any contract of employment, severance or other agreement between the
          Company and any other employee, person or entity.

     (e)  Notice.  For all purposes under the Plan, participants shall be deemed
          to be notified of any event requiring notification to participants if
          such notice is:

          (1)  delivered to participants verbally or in writing at their place
               of employment;

          (2)  posted in a prominent location or a location generally used for
               posting notices at the worksite of the participants;

          (3)  mailed to the last known addresses of the participants;

          (4)  electronically transmitted to the participants via any electronic
               mail address of the participants known to the Company; or

          (5)  delivered by a combination of the above or by any other means of
               notification reasonably designed to provide notice to
               participants.

                                       7
<PAGE>
 
12.  YOUR RIGHTS UNDER ERISA

     Each employee eligible to benefit from the Plan has a right to information
     about the Plan, such as how it operates and an explanation of the benefits
     to which participants will be entitled under the terms of the Plan.

     This Summary Plan Description is designed to give you an explanation of how
     the Plan operates.  The Plan is administered in accordance with the Plan
     document (which is the same as this Summary Plan Description) as well as
     applicable laws such as the ERISA.  Each participant has the right to
     examine, without charge and upon proper request, all Plan documents and
     copies of all documents filed by the Plan with the U.S. Department of
     Labor, such as any required annual reports.  Copies of all Plan documents
     and other Plan information may be obtained by written request to the Plan
     Administrator.  The Plan Administrator may make a reasonable charge for any
     copies requested.

     Every effort will be made to provide any requested document or report
     within thirty (30) days after it is requested.  You will be notified if
     more time is needed to comply with your request.  Financial penalties may
     be imposed upon the Plan Administrator if any materials which you have
     properly requested are not received within thirty (30) days of your request
     (unless the materials were not sent because of matters beyond the control
     of the Plan Administrator).

     Certain Plan information is made available to participants automatically,
     so that no special request need be made, such as this Summary Plan
     Description.

     ERISA imposes obligations upon the persons who are responsible for the
     operation of an employee benefit plan.  The people who operate the Plan,
     referred to as plan "fiduciaries," have a duty to do so prudently and in
     the interest of Plan participants and beneficiaries.  Fiduciaries who
     violate ERISA may be removed and required to make good any losses they may
     have caused to the Plan.

     The law protects you from being terminated, disciplined or discriminated
     against if you attempt to obtain benefits which may be due you or if you
     exercise your rights under ERISA.

     Occasionally, a benefit claim will be denied.  When this happens, you are
     entitled to a written explanation of the reason for denial, plus an
     explanation of your right to request an administrative review of the denied
     claim.  The procedure for appeal of denied benefits is outlined in this
     Summary Plan Description.

     If you fail to receive, within thirty (30) days of your request, any
     information which you are legally entitled to request, or if your claim for
     benefits is denied after it has been fully reviewed as provided by the Plan
     and you are not satisfied with the review, or if you believe a fiduciary
     has violated his or her responsibilities, you have a right to file suit in
     a federal court or to request assistance from the U.S. Department of Labor.
     In any lawsuit, the court may require the losing party to pay all legal
     costs, including attorneys' fees.

                                       8
<PAGE>
 
     In the event of any inconsistency between this document and any other
     communication regarding the Plan, this document controls.

     If you have any questions about your ERISA rights, contact the Human
     Resources Department of the Plan Administrator, your local benefits office
     or the nearest area office of the U.S. Labor-Management Service
     Administration, Department of Labor.

13.  GENERAL INFORMATION

     Plan Sponsor

     The Plan is sponsored by the Company.

     Plan Administrator

     The Company is the Plan Administrator.  The Plan Administrator makes the
     rules and regulations necessary to administer the Plan consistent with the
     terms and provisions of the Plan.  The Plan Administrator shall have the
     responsibility and the discretionary authority to interpret the terms of
     this Plan; to correct any defect, supply any omission or reconcile any
     inconsistency which may appear in the Plan; to determine eligibility for
     benefits; and to determine the amount of such benefits.  The
     interpretations and determinations of the Plan Administrator shall be final
     and binding unless determined by a court of competent jurisdiction to be
     arbitrary and capricious.

     Type of Plan

     The Plan is a severance pay plan that is classified as a welfare benefit
     plan under ERISA.

     Agent for Legal Process

     The Company is the agent for service of legal process.  Service of legal
     process upon the Plan may be effected by serving the Corporate Secretary,
     Mr. Craig Townsend at 16800 Greenspoint Park, Suite 300 North, Houston, TX
     77060.  The telephone number of the Company is (281) 875-2500.

     Plan Year

     The plan year is the period on which the Plan maintains its records.  The
     plan year is the twelve consecutive month period ending every October 31.

     Identification Number

     The Company has assigned 502 as the Plan identification number.  The
     Company's employer identification number is 76-0380430.

                                       9
<PAGE>
 
     IN WITNESS WHEREOF, the Company has caused this Plan to be executed this
___ day of _________________, 1999, but effective as of the Effective Date set
forth above.


                                          PETROCORP INCORPORATED

ATTEST:


_________________________________         By:
                                             ----------------------------------

                                          Printed Name:
                                                       ------------------------
                                          Title:
                                                -------------------------------

                                       10
<PAGE>
 
                                   APPENDIX A

                   GENERAL RELEASE AND COOPERATION AGREEMENT


     This Agreement is entered into by and between ____________________
(hereafter "Employee") and PetroCorp Incorporated (hereafter "Employer") and
arises out of the termination of Employee's employment.  In consideration of the
amounts paid and benefits provided pursuant to the PetroCorp Incorporated
Executive Severance Plan (the "Plan") upon Employee's termination of employment
on ___(Employee's termination of employment date) the Employee hereby
voluntarily executes this release and cooperation agreement.

     Upon execution of this agreement, Employee understands that he/she fully
and forever releases and discharges Employer its parents, affiliates and
subsidiaries, including all predecessors and successors, assigns, officers,
directors, trustees, employees, agent and attorneys, past and present
(hereinafter collectively the "Company"), from any and all claims, demands,
contracts,  causes of action, obligations, damages, and liabilities, of  any
kind or nature arising out of Employee's employment by the Company or the
termination thereof.  This release shall include but not be limited to, any
claims for relief or causes of action under federal, state or local statute,
ordinance or regulation. This release also includes but is not limited to claims
of employment discrimination pursuant to the Age Discrimination in Employment
Act of 1967 (28 U.S.C. par. 621 et seq.), Title VII of the Civil Rights Act of
1964 (42 U.S.C. par. 2000 et seq.), the Civil Rights Act of 1866 and 1871 
(42 U.S.C. par. 1981 and 1983), the Americans with Disabilities Act 
(42 U.S.C. (S) 206 et seq.), the Rehabilitation Act of 1973 (29 U.S.C. (S) 791
et seq.), the Equal Pay Act of 1963 (29 U.S.C. (S) 206 et seq.), the Worker
Adjustment and Retraining Notification Act (29 U.S.C. par. 2101) and the
Employee Retirement Income Security Act of 1974 as amended. This release
includes but is not limited to any claim of retaliatory discharge under any law,
including those mentioned above.

     Employee expressly acknowledges that:

     (a)  he or she entered into this Agreement knowingly and voluntarily,
          without any duress or coercion;
     (b)  he or she has read and understands this Agreement in its entirety;
     (c)  he or she has been advised orally and is hereby advised in writing to
          consult with an attorney with respect to this Agreement before signing
          it;
     (d)  he or she has not been forced to sign this Agreement by any employee
          or agent of the Company;
     (e)  he or she was provided forty-five (45) calendar days after receipt of
          the Agreement to consider its terms before signing it; and
     (f)  he or she is provided seven (7) calendar days from the date of signing
          to terminate and revoke this Agreement, in which case this Agreement
          shall be unenforceable, 

                                       11
<PAGE>
 
          null and void. Employee may revoke this Agreement during those seven
          (7) days by providing written Notice of Revocation to the Human
          Resources Department.

     To the extent that Employee has signed this Agreement less than forty-five
(45) calendar days after receipt of the Agreement, Employee acknowledges that he
or she hereby waives any additional time that Employee has to consider to terms
of the Agreement and that Employee was not coerced into signing the Agreement
prior to the end of such 45-day period.  Employee does not waive the seven (7)
day revocation period mention in (f) above, however.

     Employee expressly agrees never to assert a right to reinstatement with the
Company and expressly releases and discharges the Company from any obligation to
employ him or her in any capacity.  However, Employee shall not be precluded
from making any application for future employment and the Company shall not be
precluded from voluntarily rehiring Employee.

     Employee has fully reviewed the terms of this Agreement, acknowledges that
he or she understands the terms of this Agreement and states that he or she is
entering into this Agreement knowingly, voluntarily and in full settlement of
all claims that he or she may have as a result of his or her employment with or
separation of employment from the Company.

     Employee further agrees that, subject to reimbursement by the Company of
reasonable out-of-pocket costs and expenses, Employee will cooperate fully with
the Company and its counsel with respect to any matter (including litigation,
investigation or governmental proceeding) which relates to matters with which
Employee was involved during the term of employment with the Company.  Such
cooperation shall include appearing from time to time at the offices of the
Company or the Company's counsel for conferences and interviews and in general
providing the officers of the Company and its counsel with the full benefit of
Employee's knowledge with respect to any such matter.  Employee agrees to render
such cooperation in a timely fashion and at such time as may be mutually
agreeable to the parties concerned.  Employee shall return to the Company prior
to the final day of employment all documents, files (including copies thereof)
and other Company property.

     This Agreement shall be binding upon the Employee and the Company and each
of their representatives, agents and assigns, and as to Employee, his or her
spouse, heirs, legatees, administrators and personal representatives.

     Subject to the terms of the Plan, this Agreement constitutes the exclusive
and complete agreement between the parties hereto relating to the subject matter
hereof.  No amendment of this Agreement shall be binding unless in writing and
signed by the parties.

     The provisions of this Agreement are severable.  If any provision or the
scope of any provision is found to be unenforceable by a court of competent
jurisdiction, the other provisions or the affected provisions as reduced in
scope shall remain fully valid and enforceable.

     This Agreement shall be governed by the law of the State of Texas to the
extent such law is not preempted by federal law.

                                       12
<PAGE>
 
     IN WITNESS WHEREOF, the undersigned acknowledge that they have executed
this instrument as their free and voluntary act, for the uses and purposes set
forth herein on the dates set forth below.


Accepted:

EMPLOYER                                        EMPLOYEE


By:                                             By:
   ------------------------------                  ----------------------------
     Authorized Representative

Date:                                           Date:
   ------------------------------                  ----------------------------

                                       13
<PAGE>
 
                                   APPENDIX B

                            EXECUTIVE SEVERANCE PLAN


W. Neil McBean
Michael L. Lord
A.F. (Tony) Pelletier
Craig K. Townsend
Laurent A. (Larry) Baillargeon

                                       14

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Form 10-Q
Quarterly Report Pursuant to Section 13 or 15(d)  of the Security Exchange Act
of 1934 for the Quarterly Period ended March 31, 1999 and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                           6,855
<SECURITIES>                                         0
<RECEIVABLES>                                    3,697
<ALLOWANCES>                                      (50)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                10,817
<PP&E>                                         230,872
<DEPRECIATION>                               (154,415)
<TOTAL-ASSETS>                                 101,195
<CURRENT-LIABILITIES>                            8,644
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            87
<OTHER-SE>                                      39,929
<TOTAL-LIABILITY-AND-EQUITY>                   101,195
<SALES>                                          4,941
<TOTAL-REVENUES>                                 5,405
<CGS>                                                0
<TOTAL-COSTS>                                    6,511
<OTHER-EXPENSES>                                     1
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 935
<INCOME-PRETAX>                                (1,954)
<INCOME-TAX>                                     (833)
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (1,121)
<EPS-PRIMARY>                                   (0.13)
<EPS-DILUTED>                                   (0.13)
        

</TABLE>


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