SONAT INC
10-K405, 1998-03-26
NATURAL GAS TRANSMISSION
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<PAGE>   1
 
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
                                   FORM 10-K
(MARK ONE)
[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
   EXCHANGE ACT OF 1934 [NO FEE REQUIRED, EFFECTIVE OCTOBER 7, 1996]
 
   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, EFFECTIVE OCTOBER 7, 1996]
 
   FOR THE TRANSITION PERIOD FROM  TO
 
                         Commission file number 1-7179
                             ---------------------
                                   SONAT INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                            <C>
                   DELAWARE                                      63-0647939
(State or other jurisdiction of incorporation       (I.R.S. Employer Identification No.)
               or organization)
</TABLE>
 
                              AMSOUTH-SONAT TOWER
                           BIRMINGHAM, ALABAMA 35203
                             TELEPHONE 205-325-3800
                    (Address of principal executive offices)
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
 
<TABLE>
<CAPTION>
                                                          NAME OF EACH EXCHANGE ON
             TITLE OF EACH CLASS                              WHICH REGISTERED
             -------------------                          ------------------------
<S>                                            <C>
        Common Stock, $1.00 par value                  New York Stock Exchange, Inc.
                                                        Pacific Stock Exchange, Inc.
</TABLE>
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:
                                      None
 
     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]
 
     AGGREGATE MARKET VALUE OF THE VOTING STOCK HELD BY NON-AFFILIATES OF THE
REGISTRANT, AS OF JANUARY 30, 1998 -- $3,734,334,844.
                  NUMBER OF SHARES OF COMMON STOCK, $1.00 PAR
             VALUE, OUTSTANDING ON JANUARY 30, 1998 -- 109,960,050
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
 PORTIONS OF THE PROXY STATEMENT OF THE REGISTRANT DATED AS OF MARCH 21, 1998,
    ARE INCORPORATED BY REFERENCE INTO PART III OF THIS REPORT ON FORM 10-K.
 
================================================================================
<PAGE>   2
 
                                   SONAT INC.
 
                          INDEX TO REPORT ON FORM 10-K
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
ITEM                                                                        PAGE
- ----                                                                       ------
<S>          <C>                                                           <C>
PART I
 
Item 1.      Business....................................................  I-1
               Exploration and Production................................  I-1
                  Sonat Exploration Company..............................  I-2
                    Consolidated Wells and Acreage.......................  I-6
                    Consolidated Exploratory and Development Wells.......  I-6
                    Consolidated Net Production..........................  I-6
                  Sonat Exploration GOM Inc..............................  I-7
                    Oil and Gas Reserves.................................  I-9
                    Exploration and Development Activity.................  I-10
                    Net Production, Unit Prices, and Production Costs....  I-10
                    Development, Exploration, and Acquisition
                     Expenditures........................................  I-11
                    Acreage..............................................  I-11
                  Competition and Current Business Conditions............  I-11
               Natural Gas Transmission..................................  I-12
                  Southern Natural Gas Company...........................  I-12
                  Florida Gas Transmission Company.......................  I-12
                  Sea Robin Pipeline Company.............................  I-12
                  South Georgia Natural Gas Company......................  I-12
                  Destin Pipeline Company, L.L.C.........................  I-13
                  Etowah LNG Company, L.L.C..............................  I-13
                  Markets -- Transportation..............................  I-13
                  Markets -- System Expansions...........................  I-15
                  Gas Sales and Supplies.................................  I-17
                  Rate and Regulatory Proceedings........................  I-17
                  Storage Fields.........................................  I-17
                  Competition and Current Business Conditions............  I-17
               Energy Services...........................................  I-20
                  Sonat Energy Services Company..........................  I-20
                    Sonat Marketing Company L.P..........................  I-20
                    Sonat Public Service Company L.L.C...................  I-20
                    Unicom Gas Services LLC..............................  I-20
                    Sonat Power Marketing L.P............................  I-20
                    Sonat Power Inc......................................  I-21
                    Sonat Intrastate-Alabama Inc.........................  I-21
                  Sonat Power Systems Inc................................  I-21
                  Competition and Current Business Conditions............  I-21
               Governmental Regulation...................................  I-23
                  Exploration and Production.............................  I-23
                  Natural Gas Transmission...............................  I-23
                  Energy Services........................................  I-24
               Environmental Matters.....................................  I-24
               Year 2000 Project.........................................  I-24
               Cautionary Statement Concerning Forward-Looking
                   Statements............................................  I-24
Item 2.      Properties..................................................  I-24
Item 3.      Legal Proceedings...........................................  I-25
</TABLE>
<PAGE>   3
 
<TABLE>
<CAPTION>
ITEM                                                                        PAGE
- ----                                                                       ------
<S>          <C>                                                           <C>
Item 4.      Submission of Matters to a Vote of Security Holders.........  I-26
             Executive Officers of the Registrant........................  I-26
 
PART II
Item 5.      Market for the Registrant's Common Equity and Related
             Stockholder Matters.........................................  II-33
Item 6.      Selected Financial Data.....................................  II-45
Item 7.      Management's Discussion and Analysis of Financial Condition
             and Results of Operations...................................  II-2
Item 7A.     Quantitative and Qualitative Disclosures About Market
             Risk........................................................  II-12
Item 8.      Financial Statements and Supplementary Data.................  II-19
Item 9.      Changes in and Disagreements with Accountants on Accounting
             and Financial Disclosure....................................  II-47
 
PART III
Item 10.     Directors and Executive Officers of the Registrant..........  III-1
Item 11.     Executive Compensation......................................  III-1
Item 12.     Security Ownership of Certain Beneficial Owners and
             Management..................................................  III-1
Item 13.     Certain Relationships and Related Transactions..............  III-1
 
PART IV
Item 14.     Exhibits, Financial Statement Schedules, and Reports on Form
             8-K.........................................................  IV-1
</TABLE>
<PAGE>   4
 
                                     PART I
 
ITEM 1.  BUSINESS
 
     Sonat Inc. ("Sonat" or the "Company") is a diversified energy holding
company. It is engaged through Sonat Exploration Company ("Exploration") and
Sonat Exploration GOM Inc. ("Sonat GOM") in domestic oil and natural gas
exploration and production, through Southern Natural Gas Company ("Southern")
and Citrus Corp. ("Citrus") in the transmission and storage of natural gas, and
through Sonat Energy Services Company ("Sonat Energy Services") in natural gas
and electric power marketing.
 
     Exploration, which is the sixth largest independent oil and gas producer in
the United States, operates primarily in Texas, Oklahoma, Louisiana, Arkansas,
and the Gulf of Mexico. In January 1998 Sonat completed a $1.3 billion merger
with Zilkha Energy Company ("Zilkha"), a privately owned oil and gas
exploration, development, and production company operating primarily offshore in
the shallow waters of the Gulf of Mexico. Following the merger, Zilkha was
renamed Sonat GOM. Oil and gas exploration and production activities contributed
approximately 35 percent of Sonat's consolidated operating income for 1997.
 
     Southern is a major transporter of natural gas to the southeastern United
States. Its natural gas pipeline system extends primarily from gas producing
areas of Texas and Louisiana, both onshore and offshore, to markets in a
seven-state area of the Southeast. Sonat and Enron Corp., an unaffiliated
company, each owns a one-half interest in Citrus, a holding company that owns
100 percent of Florida Gas Transmission Company ("Florida Gas"). Florida Gas is
an interstate natural gas pipeline that serves electric generation, resale, and
industrial markets in Florida. Natural gas transmission operations, excluding
Citrus, contributed approximately 60 percent of Sonat's consolidated operating
income for 1997. Sonat's share of Citrus' 1997 earnings of approximately $28.7
million is reflected in Equity in Earnings of Unconsolidated Affiliates in its
Consolidated Statements of Income.
 
     Sonat Energy Services' largest subsidiary, Sonat Marketing Company L.P.
("Sonat Marketing"), sells natural gas throughout much of the United States,
principally the area east of the Rocky Mountains. Sonat Marketing is 65-percent
owned by a subsidiary of Sonat Energy Services, with the remaining interest
owned by a subsidiary of AGL Resources, Inc., an unaffiliated company ("AGL
Resources"). At year-end 1997 Sonat Marketing was one of the ten largest natural
gas marketers in the United States. Sonat Energy Services owns 65 percent of
Sonat Power Marketing L.P. ("Power Marketing"), which markets electric power
throughout the area of the United States east of the Rocky Mountains. AGL
Resources owns the remaining 35 percent interest in Power Marketing. Energy
marketing activities contributed approximately four percent of Sonat's
consolidated operating income for 1997, inclusive of the minority interests.
 
     Sonat was incorporated under the laws of Delaware in 1973 in connection
with a reorganization of Southern. At March 1, 1998, Sonat and its subsidiaries
employed approximately 2,110 people.
 
     Sonat's principal executive offices are located at 1900 Fifth Avenue North,
AmSouth-Sonat Tower, Birmingham, Alabama 35203, and its telephone number is
(205) 325-3800.
 
     Additional business information is contained in Management's Discussion and
Analysis of Financial Condition and Results of Operations and in the Notes to
Consolidated Financial Statements in Part II of this report, which are
incorporated herein by reference. Reference is made to Note 12 of the Notes to
Consolidated Financial Statements contained in Part II of this report for
further information with respect to the portions of Sonat's revenues, operating
profit, capital expenditures, and identifiable assets attributable to each of
its business segments.
 
                           EXPLORATION AND PRODUCTION
 
     Sonat is engaged in the exploration for and the acquisition, development,
and production of oil and natural gas through its wholly owned subsidiaries,
Sonat Exploration Company, and its subsidiary companies (collectively referred
to as "Exploration" unless the context indicates otherwise) and Sonat GOM, as
described below.
 
                                       I-1
<PAGE>   5
 
SONAT EXPLORATION COMPANY
 
     Exploration's principal office is located in Houston, Texas. Exploration
also has offices in Tyler and Midland, Texas, and Oklahoma City, Oklahoma. The
oil and gas properties of Exploration are principally located onshore in the
Southern coastal states, in various states in the Southwest and Midwest, and in
federal waters offshore Louisiana and Texas. As of December 31, 1997,
Exploration had operations or properties in 13 states. Exploration had working
interests in approximately 2.9 million gross acres or 2.1 million net acres
onshore as of December 31, 1997. Of this onshore acreage, approximately 1.1
million gross or 663,000 net acres were producing oil or gas. In addition, as of
such date, Exploration had a working interest in 53 federal offshore blocks in
the Gulf of Mexico and one state offshore block, totaling approximately 217,000
gross acres or 145,000 net acres. Of these blocks, 49 were producing oil or gas.
 
     Beginning in 1988 Exploration implemented a strategy to acquire gas
properties with significant development potential. In 1996, however, Exploration
began to focus more of its resources on development and exploratory drilling
activities to more fully exploit the exploratory and development drilling
prospects it had developed on the substantial acreage it had acquired. As a
result, expenditures for exploration and development drilling activities in 1996
exceeded expenditures for producing property acquisitions for the first time in
nine years. Exploration expects to focus more on exploratory and development
drilling and expanding its land positions through leasing rather than on
property acquisitions for future growth. Exploration increased its total proved
reserves to approximately 2.2 trillion cubic feet ("Tcf") of natural gas
equivalent at the end of 1997, compared to approximately 2.0 Tcf at the end of
1996. Approximately 84 percent of Exploration's proved reserves are natural gas.
 
     In 1997 Exploration participated in the drilling of 407 development wells,
of which 94 percent were successful. Exploration also participated in the
drilling of 14 exploratory wells in 1997, nine of which were successful. Of the
total of 421 wells in which Exploration participated in drilling in 1997, it
operated 374. Exploration plans to drill approximately 420 additional wells
during 1998, which includes those planned by Sonat GOM. Exploration increased
net proved reserves during 1997 by approximately 285 billion cubic feet ("Bcf ")
of natural gas equivalent through drilling and producing operations.
 
     During 1997 Exploration expanded its lease position in the Cotton Valley
Pinnacle Reef trend from 300,000 to 405,000 gross acres. All of the discoveries
to date in this trend have been in the Bear Grass area in Freestone and Leon
Counties, Texas. In mid-1997 Exploration drilled a dry hole 45 miles north of
the Bear Grass area in Henderson County, Texas, in an attempt to extend
production to an area where it has a large acreage position. Additional seismic
and geologic work has been done in this area, and Exploration plans to drill a
second well there in 1998. Altogether, as a part of its drilling program,
Exploration participated in the drilling of eight wells in this trend during
1997, of which six were successful, and plans to drill seven additional wells
there during 1998.
 
     Exploration has also maintained an active drilling program in the Austin
Chalk trend. Its initial Austin Chalk drilling program was in east Texas, but
its development activities in this trend are now focused in the Hurricane Branch
and Masters Creek areas in Vernon and Rapides Parishes in Louisiana. As a part
of its drilling program, Exploration participated in the drilling of 27
horizontal wells in this trend during 1997, of which 21 were successful.
 
     With the merger of a subsidiary of Sonat with Zilkha, as described below
under the heading "Sonat Exploration GOM Inc.," Exploration expects to focus in
1998 on developing the extensive interests of Sonat GOM in the Gulf of Mexico.
Exploration has evaluated a significant number of new prospects to develop and
plans to drill 23 exploratory wells and 14 development wells in the Gulf of
Mexico during 1998.
 
     During 1997 Exploration acquired approximately 20.5 Bcf of proved natural
gas equivalent reserves in five separate transactions totaling $5.6 million, for
an average acquisition cost of $.27 per thousand cubic feet equivalent. Through
these acquisitions, Exploration increased its position in east Texas and north
Louisiana.
 
     As of December 31, 1997, Exploration's net proved reserves totaled 58
million barrels of crude oil, condensate, and natural gas liquids and 1,850 Bcf
of natural gas. As of December 31, 1996, Exploration's net proved reserves
amounted to 51 million barrels of crude oil, condensate, and natural gas liquids
and 1,692 Bcf
                                       I-2
<PAGE>   6
 
of natural gas. For additional information concerning reserves, see Note 13 of
the Notes to Consolidated Financial Statements in Part II of this report.
 
     Exploration's total exploration and production capital expenditures in 1997
were $539 million compared with $368 million in 1996. While Exploration expects
that it will make some small producing property acquisitions in 1998, it has
shifted to a reserve replacement and growth strategy more focused on exploration
and aggressive development drilling. Capital spending in 1998, including that of
Sonat GOM, is expected to be approximately $538 million, which includes
allocations of $398 million for development drilling and $136 million for
exploration, including leasing and seismic, with the remainder targeted for
small producing property acquisitions. Of the total of $534 million allocated
for drilling and exploration activities, $215 million is targeted for Gulf of
Mexico activities and $319 million is targeted for onshore activities. Changes
in this capital program may occur during the year since the number, type, and
timing of prospects drilled are subject to continual revision as a result of
many factors, including the number of new prospects identified and secured
through exploration and joint ventures with others, the number of prospects
identified through ongoing geologic evaluation or seismic reprocessing efforts,
rig availability, lease expiration dates, the availability of capital to fund
such projects, initial test results, the price of oil and gas, weather, and
other general economic conditions. While maintaining an active drilling program,
Exploration has also continued its cost control and productivity improvement
efforts.
 
     In order to focus its exploration and production efforts and to minimize
operating and other costs, Exploration disposed of certain nonstrategic oil and
gas interests in 1997 in the states of Texas, Louisiana, Arkansas, and Oklahoma,
and the Gulf of Mexico. These properties were sold for a total of approximately
$35.3 million and included net proved reserves of approximately 36.2 Bcf of
natural gas equivalent. Exploration expects that it will continue to upgrade its
asset base through disposal of non-strategic properties in the future.
 
     Exploration relies on its own technical staff for the selection of its
drilling prospects. Leases on desirable, nonproducing offshore prospects are
typically acquired in federal and state waters by acquisition or through a
competitive bidding process from the federal or state governments. Exploration
has, and may in the future, bid with other companies for leases on prospective
offshore acreage. Onshore leases are acquired by Exploration's staff and by
independent lease brokers at the direction of Exploration's staff, through
farmouts, through participation in prospects developed by others, or by
acquisition. Exploration may, as it has in the past, enter into joint venture
arrangements where exploration and development activity is performed on behalf
of the joint venture by whichever company is designated as operator. Drilling
for Exploration is conducted by independent drilling contractors.
 
     There have been no oil or gas reserve estimates filed or included in any
reports to any federal agency within the last twelve months, except Form EIA-23
Annual Survey of Domestic Oil and Gas Reserves filed with the Federal Energy
Regulatory Commission (the "FERC") and Form 9-1866 (Request for Reservoir
Maximum Efficient Rate) filed with the Minerals Management Service of the U.S.
Department of the Interior (the "MMS"). There are no material differences in the
reserves reflected in such reports and the estimated reserves as reflected in
Note 13 of the Notes to Consolidated Financial Statements in Part II of this
report, except for differences resulting from actual production, acquisitions,
property sales, and necessary reserve revisions and additions to reflect actual
experience.
 
     There are numerous uncertainties inherent in estimating quantities of
proved reserves, including many factors beyond the control of Exploration. The
reserve data set forth herein represent only estimates. Reservoir engineering is
a subjective process of estimating underground accumulations of crude oil and
natural gas that cannot be measured in an exact manner, and the accuracy of any
reserve estimate is a function of the quality of available data and of
engineering and geological interpretations and judgment. As a result, estimates
of different engineers often vary. In addition, results of drilling, testing,
and production subsequent to the date of an estimate may justify revision of
such estimate. Accordingly, reserve estimates are often different from the
quantities of crude oil and natural gas that are ultimately recovered. The
meaningfulness of such estimates is highly dependent upon the accuracy of the
assumptions upon which they were based. In general, the volume of production
from oil and gas properties owned by Exploration declines as reserves are
depleted. Except to the
 
                                       I-3
<PAGE>   7
 
extent Exploration conducts successful exploration and development activities or
acquires additional properties containing proved reserves, or both, the proved
reserves of Exploration will decline as reserves are produced.
 
     Exploration's business is subject to all of the operating risks normally
associated with the exploration for and production of oil and gas, including
blowouts, cratering, pollution, and fires, each of which could result in damage
to or destruction of oil and gas wells, formations, production facilities, or
properties or in personal injury. Sonat maintains broad insurance coverage on
behalf of Exploration with respect to losses resulting from these operating
hazards.
 
     See "Governmental Regulation -- Exploration and Production" below for
information concerning the effect of various laws and governmental regulations
on Exploration's operations.
 
     The following tables detail the gross lease acreage of both producing and
nonproducing onshore properties and offshore lease blocks in which Exploration
had an interest at December 31, 1997. The map on page I-5 following the tables
generally depicts the areas in which Exploration had significant lease interests
as of that date.
 
                           SONAT EXPLORATION COMPANY
 
                          ONSHORE GROSS LEASE ACREAGE
 
<TABLE>
<CAPTION>
STATE                                                    PRODUCING    NON-PRODUCING      TOTAL
- -----                                                    ---------    -------------    ---------
<S>                                                      <C>          <C>              <C>
Alabama................................................      9,450         32,270         41,720
Arkansas...............................................    260,706         73,047        333,753
Louisiana..............................................    196,947        764,736        961,683
Oklahoma...............................................    221,983         77,678        299,661
Texas..................................................    330,736        923,622      1,254,358
Other..................................................     25,816          3,598         29,414
                                                         ---------      ---------      ---------
          Total........................................  1,045,638      1,874,951      2,920,589
                                                         =========      =========      =========
</TABLE>
 
                          OFFSHORE GROSS LEASE BLOCKS
 
<TABLE>
<CAPTION>
AREA                                                          PRODUCING    NON-PRODUCING    TOTAL
- ----                                                          ---------    -------------    -----
<S>                                                           <C>          <C>              <C>
Mustang Island..............................................      3              2            5
High Island(1)..............................................     10              0           10
Sabine Pass.................................................      4              0            4
West Cameron(2).............................................     14              0           14
East Cameron(3).............................................      8              1            9
Eugene Island...............................................      4              0            4
Ship Shoal..................................................      3              1            4
Mississippi Canyon(4).......................................      3              0            3
                                                                 --             --           --
          Total.............................................     49              4           53
                                                                 ==             ==           ==
</TABLE>
 
- ---------------
 
(1) In one of the producing blocks, High Island 139, Exploration only has an
    overriding royalty interest.
(2) Exploration has a 12.5 percent working interest below 9,500 feet in West
    Cameron 290, which is one of the 14 producing blocks. In one of the
    producing blocks, West Cameron 421, Exploration only has an overriding
    royalty interest.
(3) In one of the producing blocks, East Cameron 33, Exploration only has an
    overriding royalty interest. Exploration has a 40.73 percent working
    interest below 10,500 feet in East Cameron 223 and a 31.23 percent working
    interest below 10,500 feet in East Cameron 231.
(4) Exploration is not a lessee of one of the four producing blocks, Mississippi
    Canyon 150, but this block has been unitized with the three producing lease
    blocks in the area in which Exploration has working interests.
 
                                       I-4
<PAGE>   8
 
                       (SONAT EXPLORATION INTERESTS MAP)
 
                                       I-5
<PAGE>   9
 
     CONSOLIDATED WELLS AND ACREAGE.  The following table sets forth information
concerning Exploration's consolidated working interests in oil and gas
properties as of December 31, 1997.
 
<TABLE>
<CAPTION>
                                            TOTAL NUMBER OF
                                              PRODUCTIVE
                                                 WELLS                                     NUMBER OF
                                            ---------------     DEVELOPED   UNDEVELOPED   WELLS BEING
                                            OIL       GAS         ACRES        ACRES        DRILLED
                                            ----     ------     ---------   -----------   ------------
<S>                                         <C>      <C>        <C>         <C>           <C>
Gross.....................................  239(1)   2,777(2)   1,232,000    1,906,000         74
Net.......................................  158      1,733        793,000    1,491,000         49
</TABLE>
 
- ---------------
 
(1) Three of these wells are multiple completions.
(2) 94 of these wells are multiple completions.
 
     CONSOLIDATED EXPLORATORY AND DEVELOPMENT WELLS.  The following table sets
forth certain consolidated information regarding exploratory and development
wells drilled during the years 1995 through 1997.
 
<TABLE>
<CAPTION>
                                                            NET EXPLORATORY     NET DEVELOPMENT WELLS
                                                             WELLS DRILLED             DRILLED
                                                           ------------------   ---------------------
                                                           1995   1996   1997   1995    1996    1997
                                                           ----   ----   ----   -----   -----   -----
<S>                                                        <C>    <C>    <C>    <C>     <C>     <C>
Productive...............................................  0.5    6.4    7.0    187.1   205.7   294.0
Dry......................................................    0    4.0    3.7      9.4     5.4    18.3
</TABLE>
 
     For information concerning Exploration's (i) capitalized costs of oil and
gas producing activities, (ii) costs incurred in oil and gas producing
activities, (iii) net revenues from oil and gas production, (iv) estimated
proved oil and gas reserves, (v) estimated future oil and gas net revenues, and
(vi) present value of estimated future net revenues from estimated production of
proved oil and gas reserves, see Note 13 of the Notes to Consolidated Financial
Statements in Part II of this report. The standardized measures of discounted
future net cash flows relating to Exploration's oil (including condensate) and
gas reserves are calculated as prescribed by Statement of Financial Accounting
Standards No. 69. The standardized measures of Exploration's proved oil and gas
reserves presented in Part II of this report do not represent Sonat's estimate
of their fair market value and are not otherwise representative of the value
thereof, but rather, as stipulated and required by the Financial Accounting
Standards Board, are intended solely to assist financial statement users in
making comparisons between companies.
 
     CONSOLIDATED NET PRODUCTION.  Exploration had interests in production from
2,889 producing wells onshore and 127 producing wells offshore as of December
31, 1997. Reference is made to the table in Management's Discussion and Analysis
of Financial Condition and Results of Operations in Part II of this report
showing the consolidated net production (sales volumes) of oil and condensate,
natural gas liquids, and natural gas for 1995 to 1997 and the average sales
prices for those years (including transfers). The average production (lifting)
costs per unit of oil and gas was $.43 in 1997, $.35 in 1996, and $.38 in 1995.
The average production cost is calculated by converting all units of production
to the equivalent thousand cubic feet ("Mcf") of gas using the relative energy
content method.
 
     Exploration sells its crude oil production generally at posted prices,
subject to adjustments for gravity and transportation. Exploration sells its
natural gas primarily to Sonat Marketing at spot-market prices. Exploration also
sells some of its gas under long-term contracts directly to pipelines,
distribution companies, and end-users. Exploration sells natural gas liquids at
market prices under monthly or long-term contracts. Sales of natural gas by
Exploration to affiliates accounted for approximately 73 percent of
Exploration's revenues in 1997 and in 1996.
 
     During 1993 Sonat Marketing entered into agreements with Exploration
pursuant to which Sonat Marketing purchases substantially all of Exploration's
natural gas production that is not sold under pre-existing term dedications. The
purchase prices for natural gas covered by these agreements is based on
representative index prices agreed upon by Exploration and Sonat Marketing as
representing the market value of the gas. A portion of Exploration's production
is hedged by entering into intercompany swaps with Sonat Marketing to reduce the
risks associated with spot-market price volatility. See Note 3 of the Notes to
Consolidated Financial Statements contained in Part II of this report.
 
                                       I-6
<PAGE>   10
 
SONAT EXPLORATION GOM INC.
 
     On January 30, 1998, Sonat closed the merger of one of its wholly owned
subsidiaries with Zilkha, a privately owned oil and gas exploration,
development, and production company operating primarily offshore in the shallow
waters of the Gulf of Mexico, for $1.3 billion. Following the merger, Zilkha was
renamed Sonat GOM, which is a wholly owned subsidiary of Sonat with its
principal office in Houston, Texas. Also, following the merger, Sonat GOM became
responsible for all of the offshore Gulf of Mexico exploration and development
operations of Exploration. See Note 15 of the Notes to Consolidated Financial
Statements in Part II of this report for additional details regarding the
merger. The results of Zilkha are not included in such Consolidated Financial
Statements. All references below to matters prior to January 30, 1998, are to
Zilkha, while all references to matters after such date are to Sonat GOM.
 
     Sonat GOM holds the industry's largest net leasehold position in the
shallow water area (less than 600 feet) of the Gulf of Mexico. At December 31,
1997, Zilkha had an ownership interest in approximately 390 state and federal
lease blocks, of which 11 blocks were located in deep water areas and
approximately 340 lease blocks (covering approximately 1.4 million net acres)
were undeveloped. Zilkha also had a contractual interest (with rights to drill
to earn) in approximately 200,000 additional undeveloped acres. Zilkha had
licensed or contracted to license 3-D seismic data covering approximately 6,100
lease blocks in both shallow and deep water areas of the Gulf of Mexico. At
December 31, 1997, Zilkha's total proved reserves were estimated to be
approximately 401,480 billion cubic feet equivalent ("Bcfe"), consisting of
310,802 million cubic feet ("MMcf") of natural gas and 15,113 million barrels
("MMBbls") of crude oil and condensate. Zilkha's total daily production in 1997
averaged 173 MMcf of natural gas and 5.9 thousand barrels ("MBbls") of crude oil
and condensate. Zilkha operated 70% of its fields and 86% of its proved reserves
at December 31, 1997.
 
     Sonat GOM has expanded its reserve base and production principally through
exploration and associated development drilling. The Gulf of Mexico is a
well-established area of oil and gas production where Sonat GOM's management and
staff have both experience and expertise and where the application of advances
in 3-D and 2-D seismic and computer-aided exploration technology is particularly
well suited. From 1992 through the end of 1997, Zilkha spent approximately $130
million on 3-D seismic and reprocessing. At December 31, 1997, Zilkha had
approximately 4,100 lease blocks of 3-D seismic data coverage with contractual
commitments to purchase an additional 2,000 lease blocks of coverage within the
next three years. With the aid of seismic technology, Zilkha had achieved a 65%
success rate with respect to the 86 gross exploratory wells it has completed
drilling between January 1, 1992, and December 31, 1997.
 
     Sonat GOM's producing properties are all located in the shallow water area
of the Gulf of Mexico, with most located in 30 to 150 feet of water. The fields
are typically one to three well fields with high flow rates per completion,
generally between seven and 25 MMcf per day initial rates per zone. Most of
Sonat GOM's production is less than six years old, with operating costs
generally under $0.25/Mcfe. Based upon the reserve report, dated February 27,
1998 (the "Reserve Report"), prepared by William M. Cobb & Associates, Inc.
("Cobb"), at December 31, 1997, approximately 260 Bcfe, or 65%, of Zilkha's
proved reserves, were attributable to nine properties. A map generally depicting
the areas at January 30, 1998, in which Sonat GOM has significant lease
interests and in which it has licensed or contracted to license 3-D seismic data
appears on page I-8.
 
                                       I-7
<PAGE>   11
 
                             (SONAT GOM INTERESTS)
 
                                       I-8
<PAGE>   12
 
     OIL AND GAS RESERVES.  The following table sets forth certain information
on the total proved reserves for Zilkha as of December 31, 1997. Information in
the following table is based upon the Reserve Report in accordance with the
rules and regulations of the Securities and Exchange Commission. For purposes of
preparing such estimates, Cobb reviewed production data through November 30,
1997. In order to calculate the proved reserve estimates as of December 31,
1997, Cobb assumed that production for each of Zilkha's properties since the
date of the last production data reviewed was in accordance with the production
decline curve previously established for such property.
 
<TABLE>
<CAPTION>
                                                                 NET PROVED RESERVES
                                                              --------------------------
                                                                GAS      OIL      TOTAL
                                                              -------   ------   -------
                                                              (MMCF)    (MBBL)   (BCFE)
<S>                                                           <C>       <C>      <C>
Producing...................................................  152,282   4,925    181,832
Non-Producing...............................................   51,160   3,510     72,220
Undeveloped.................................................  107,360   6,678    147,428
                                                              -------   ------   -------
          Total Proved......................................  310,802   15,113   401,480
</TABLE>
 
     Since July 1, 1997, Sonat GOM has not filed any estimates of proved oil and
gas reserves with any federal authority or agency. Sonat included such estimates
in the Registration Statement under the Securities Act of 1933 on Form S-4 filed
with the Securities and Exchange Commission on December 10, 1997, as
Registration No. 333-41851. There are no material differences in the reserves
reflected in such Registration Statement and the reserves estimated herein,
except for differences resulting from actual production, acquisitions, property
sales, and necessary reserve revisions and additions to reflect actual
experience.
 
     There are numerous uncertainties inherent in estimating quantities of
proved reserves, including many factors beyond the control of Sonat GOM. The
reserve data set forth herein represents only estimates. Reservoir engineering
is a subjective process of estimating underground accumulations of crude oil and
natural gas that cannot be measured in an exact manner, and the accuracy of any
reserve estimate is a function of the quality of available data and of
engineering and geological interpretations and judgment. As a result, estimates
of different engineers often vary. In addition, results of drilling, testing,
and production subsequent to the date of an estimate may justify revision of
such estimate. Accordingly, reserve estimates are often different from the
quantities of crude oil and natural gas that are ultimately recovered. The
meaningfulness of such estimates is highly dependent upon the accuracy of the
assumptions upon which they were based. In general, the volume of production
from oil and gas properties owned by Sonat GOM declines as reserves are
depleted. Except to the extent Sonat GOM conducts successful exploration and
development activities or acquires additional properties containing proved
reserves, or both, the proved reserves of Sonat GOM will decline as reserves are
produced.
 
                                       I-9
<PAGE>   13
 
     EXPLORATION AND DEVELOPMENT ACTIVITY.  Zilkha drilled, or participated in
the drilling of, the following numbers of total offshore wells during the
periods indicated.
 
<TABLE>
<CAPTION>
                                                                     YEARS ENDED DECEMBER 31,
                                                            ------------------------------------------
                                                                1997           1996           1995
                                                            ------------   ------------   ------------
                                                            GROSS   NET    GROSS   NET    GROSS   NET
                                                            -----   ----   -----   ----   -----   ----
<S>                                                         <C>     <C>    <C>     <C>    <C>     <C>
Exploratory Wells
  Gas.....................................................  10.0     8.3   12.0    10.1    4.0     3.4
  Oil.....................................................   4.0     4.0    6.0     5.3    1.0     0.1
  Dry.....................................................  13.0    10.6    2.0     1.7    5.0     4.4
                                                            ----    ----   ----    ----   ----    ----
          Total...........................................  27.0    22.9   20.0    17.1   10.0     7.9
Development Wells
  Gas.....................................................   4.0     0.7    1.0     1.0    0.0     0.0
  Oil.....................................................   3.0     1.3    4.0     0.7    1.0     1.0
  Dry.....................................................   1.0     1.0    0.0     0.0    0.0     0.0
                                                            ----    ----   ----    ----   ----    ----
          Total...........................................   8.0     3.0    5.0     1.7    1.0     1.0
Total Wells
  Gas.....................................................  14.0     9.0   13.0    11.1    4.0     3.3
  Oil.....................................................   7.0     5.3   10.0     6.0    2.0     1.2
  Dry.....................................................  14.0    11.6    2.0     1.7    5.0     4.4
                                                            ----    ----   ----    ----   ----    ----
          Total...........................................  35.0    25.9   25.0    18.8   11.0     8.9
</TABLE>
 
     The information contained in the foregoing table should not be considered
indicative of future drilling performance, nor should it be assumed that there
is any necessary correlation between the number of productive wells drilled and
the amount of oil and gas that may ultimately be recovered from such wells.
 
     During 1997 Zilkha completed the drilling of 27 gross (23 net) exploration
wells in the shallow water area of the Gulf of Mexico. Of these wells, 14 gross
(12 net) were successful in finding commercial quantities of hydrocarbons and
have been or will be completed for production.
 
     Out of a total of approximately 390 state and federal lease blocks in which
Zilkha owned an interest at December 31, 1997, approximately 340 lease blocks
(covering approximately 1.4 million acres) are undeveloped. Zilkha had an
inventory of more than 70 identified prospects on acreage owned or controlled by
Zilkha. Sonat GOM plans to drill approximately 35 to 40 prospects in 1998, four
of which are located on farmed in or joint venture acreage with the remainder
being on acreage that is owned 100% by Sonat GOM. Substantially all of the
drilling Zilkha conducted in 1997 and that Sonat GOM intends to conduct in 1998
is in the shallow water area of the Gulf of Mexico. While Sonat GOM currently
intends to complete the drilling of these prospects, the number, type and timing
of the prospects drilled are subject to continued revision as a result of many
factors, including the number of new prospects identified and secured through
exploration and joint ventures with others, the number of prospects identified
through ongoing geologic evaluation or seismic reprocessing efforts, rig
availability, lease expiration dates, the availability of capital to fund such
projects, initial test results, the price of oil and gas, weather, and other
general economic conditions.
 
     NET PRODUCTION, UNIT PRICES, AND PRODUCTION COSTS.  As of December 31,
1997, Zilkha had an ownership interest in 70 gross (44.7 net) productive wells,
including 54 gross (37.2 net) productive natural gas wells and 16 gross (7.5
net) productive oil wells.
 
                                      I-10
<PAGE>   14
 
     The following table sets forth certain information regarding the net
production volumes, average sales prices received, and average production costs
associated with Zilkha's sales of oil and natural gas for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                   YEARS ENDED
                                                                  DECEMBER 31,
                                                              ---------------------
                                                              1997    1996    1995
                                                              -----   -----   -----
<S>                                                           <C>     <C>     <C>
Net Production:
  Gas (Bcf).................................................   63.1    63.5    55.2
  Oil (MMBbls)..............................................    2.2     1.7     2.5
          Total (Bcfe)......................................   76.3    73.5    70.3
Average Sales Price:
  Gas ($/Mcf)(1)............................................   2.65    2.64    1.72
  Oil ($/Bbl)...............................................  18.86   20.08   17.00
Average Production Cost:
  ($/Mcfe)(2)...............................................   0.19    0.17    0.18
</TABLE>
 
- ---------------
 
(1) Includes natural gas liquids.
(2) Includes direct lifting costs (labor, repairs and maintenance, materials,
    and supplies) and the administrative costs of production offices, insurance,
    and property and severance taxes.
 
     DEVELOPMENT, EXPLORATION, AND ACQUISITION EXPENDITURES.  The following
table sets forth certain information regarding the costs incurred by Zilkha in
its development, exploration, and acquisition activities during the periods
indicated.
 
<TABLE>
<CAPTION>
                                                              YEARS ENDED DECEMBER 31,
                                                              ------------------------
                                                               1997     1996     1995
                                                              ------   ------   ------
<S>                                                           <C>      <C>      <C>
Development Costs...........................................  $ 71.5   $ 38.8   $ 21.2
Exploration Costs:
  Lease Acquisitions and Delay Rentals......................    24.9     41.9     12.4
  Seismic Acquisition and Reprocessing......................    59.6     41.6     19.7
  Drilling..................................................   121.9     80.0     67.6
                                                              ------   ------   ------
          Total Capital Expenditures........................  $277.9   $202.3   $120.9
                                                              ======   ======   ======
</TABLE>
 
     ACREAGE.  As of December 31, 1997, Zilkha had an interest in approximately
1.6 million gross (1.5 million net) acres, including approximately 153,000 gross
(103,000 net) developed acres and approximately 1.45 million gross (1.4 million
net) undeveloped acres. Acreage in which Zilkha's interest was limited to
royalty, overriding royalty, and similar interests is insignificant and,
therefore, excluded.
 
COMPETITION AND CURRENT BUSINESS CONDITIONS
 
     The oil and gas business is highly competitive in the search for and
acquisition of additional reserves and in the marketing of oil and natural gas.
Exploration's competitors include the major and intermediate size oil companies,
independent oil and gas concerns, and individual producers or operators.
 
     Exploration's realized natural gas prices averaged $2.18 per thousand cubic
feet in 1997, down from $2.20 in 1996. Oil and condensate prices were higher in
1997, averaging $20.05 per barrel versus $19.25 per barrel in 1996. Exploration
hedged a portion of its 1997 production, which reduced its realized price for
natural gas and oil by $.20 per Mcf and $.20 per Bbl, respectively. See Part II
of this report in Note 3 of the Notes to Consolidated Financial Statements and
in Management's Discussion and Analysis of Financial Condition and Results of
Operations following the caption "Hedging Activities" for a discussion of oil
and gas production hedged in the future.
 
                                      I-11
<PAGE>   15
 
     Exploration plans to spend approximately $538 million in capital
expenditures in 1998, which includes allocations of $398 million for development
drilling and $136 million for exploration, including leasing and seismic, with
the remainder targeted for small producing property acquisitions. Actual
expenditures for such activities may vary from these estimates for a number of
reasons, including those discussed under the caption Cautionary Statement
Concerning Forward-Looking Statements contained below in this Part I of this
report.
 
                            NATURAL GAS TRANSMISSION
 
     Sonat owns interests in more than 14,000 miles of natural gas pipelines
extending across the southeastern United States from Texas to South Carolina and
Florida. The principal business of Sonat's pipelines is the transmission and
storage of natural gas in interstate commerce.
 
     Sonat's interstate pipeline businesses are subject to regulation by the
FERC and the U.S. Department of Transportation under the terms of the Natural
Gas Policy Act of 1978 ("NGPA"), the Natural Gas Act ("NGA"), and various
pipeline safety and environmental laws. See "Governmental Regulation -- Natural
Gas Transmission" below for information concerning the regulation of natural gas
transmission operations.
 
SOUTHERN NATURAL GAS COMPANY
 
     Sonat's principal operating company in the pipeline group is Southern, a
wholly owned subsidiary of Sonat, which owns approximately 7,500 miles of
interstate pipeline. Southern's interstate pipeline system extends from gas
fields in Texas, Louisiana, Mississippi, Alabama, and the Gulf of Mexico to
markets in Louisiana, Mississippi, Alabama, Florida, Georgia, South Carolina,
and Tennessee. Southern is the principal pipeline supplier to the growing
Southeastern markets of Alabama and Georgia. Southern's interstate pipeline
system has a firm daily delivery capacity of approximately 2.5 Bcf of natural
gas. A map of Southern's pipeline system, including pipelines of its
subsidiaries and joint ventures, as well as of the pipeline system of Florida
Gas, appears on page I-19.
 
FLORIDA GAS TRANSMISSION COMPANY
 
     Sonat owns one-half of the stock of Citrus, which owns all of the stock of
Florida Gas. Florida Gas is the primary pipeline transporter of natural gas in
the State of Florida and the sole pipeline transporter to peninsular Florida.
Florida Gas is operated by a subsidiary of Enron Corp., an unaffiliated company,
which owns the other 50 percent of Citrus. Florida Gas owns approximately 4,800
miles of interstate natural gas pipelines that extend from south Texas to a
point near Miami, Florida. Its system has a firm daily delivery capacity of
approximately 1.5 Bcf of natural gas. See the map on page I-19. For additional
information regarding Citrus, see Management's Discussion and Analysis of
Financial Condition and Results of Operations contained in Part II of this
report, and the Consolidated Financial Statements of Citrus contained in Part IV
of this report.
 
SEA ROBIN PIPELINE COMPANY
 
     Sea Robin Pipeline Company ("Sea Robin"), a wholly owned subsidiary of
Southern, owns an approximately 430-mile interstate natural gas pipeline system
located in the Gulf of Mexico. Sea Robin gathers natural gas and condensate for
others and delivers those products to shore for condensate removal and gas
processing and redelivery to one independent storage company and five downstream
transmission pipelines, including Southern. Sea Robin's pipeline system includes
66 miles of large diameter, 36-inch pipeline. See the system map on page I-19.
Sea Robin transported approximately 278 Bcf of natural gas in 1997 compared to
243 Bcf in 1996. These Sea Robin volumes are included within the Southern
transportation volumes discussed below.
 
SOUTH GEORGIA NATURAL GAS COMPANY
 
     South Georgia Natural Gas Company ("South Georgia"), a wholly owned
subsidiary of Southern, owns an approximately 910-mile interstate natural gas
transmission system located in eastern Alabama, southern
 
                                      I-12
<PAGE>   16
 
Georgia, and the Florida Panhandle. See the system map on page I-19. South
Georgia transported approximately 38 Bcf of natural gas in 1997 compared to 37
Bcf in 1996. These South Georgia volumes are included within the Southern
transportation volumes discussed below.
 
DESTIN PIPELINE COMPANY, L.L.C.
 
     In April 1997 units of Shell Oil Company ("Shell") and Amoco Corporation
("Amoco") joined with Southern in the ownership of Destin Pipeline Company,
L.L.C. ("Destin"), which is building a 212-mile interstate pipeline system
designed to transport natural gas from the growing eastern Gulf of Mexico
production area. Destin's pipeline system will extend from Main Pass Block 260
in the Gulf of Mexico northward into Mississippi, where it will connect with
five other interstate pipelines, including Southern and Florida Gas. See the
system map on page I-19. The pipeline will have a firm daily delivery capacity
of 1.0 Bcf and initial construction costs are estimated to be $313 million. Each
of the participants has a one-third interest in this company. Southern is
responsible for construction of 132 miles of onshore pipeline and related
facilities while a unit of Shell is responsible for construction of the offshore
portion of the pipeline. Southern will be the operator of the system.
Construction of the pipeline began in December 1997 and it is expected to be
partially completed and in service by July 1998 and fully in service by January
1999.
 
     Destin's FERC Gas Tariff includes a flexible firm transportation service,
which provides for levels of firm transportation capacity that may vary
quarterly, with the transportation provided at a volumetric rate provided
certain minimum throughput levels are maintained. Under the flexible firm
service, Destin's transportation revenue will fluctuate based on the levels of
gas production from its shippers. To be eligible for Destin's flexible firm
service, a shipper must make a life-of-reserves commitment of production from
offshore leases with estimated proven recoverable reserves of 100 Bcf or more.
 
     Shell and Amoco have made substantial firm transportation commitments to
this pipeline. Three other shippers have also dedicated their production from
certain leases in the Eastern Gulf of Mexico to Destin for transportation under
Destin's flexible firm rate schedule. Discussions are under way with other
prospective shippers.
 
ETOWAH LNG COMPANY, L.L.C.
 
     In December 1997 an affiliate of AGL Resources and Southern formed a new
entity, Etowah LNG Company, L.L.C. ("Etowah"), to jointly construct, own, and
operate a new liquefied natural gas peaking facility in Polk County, Georgia.
Under the agreement, AGL Resources and Southern each will own 50 percent of
Etowah, which will be regulated by the FERC. The proposed plant will connect
directly into AGL Resources' principal natural gas distribution subsidiary,
Atlanta Gas Light Company ("AGLC"), and Southern's pipeline. Etowah will provide
natural gas storage and peaking services to AGLC and other Southeastern
customers. Peaking services provide supplemental gas supplies on days when
demand is highest, typically during the winter. The new facility will cost
approximately $90 million and is expected to have 300 MMcf per day of
vaporization capacity. Affiliates of AGL Resources will manage the construction
of the facility and operate it. Southern will provide administrative services.
Etowah expects AGLC to subscribe for 200 MMcf per day of vaporization capacity,
which represents two-thirds of its available capacity, for a term of 20 years.
Etowah expects to file a certificate application with FERC in March 1998.
Subject to receiving timely FERC approval, construction will begin in early 1999
in order to provide peaking services during the 2001-02 winter heating season.
 
MARKETS -- TRANSPORTATION
 
     Sonat's pipelines provide natural gas transportation services for their
distribution customers, direct industrial customers and other end-users, gas
producers, other gas pipelines, and gas marketing and trading companies.
Southern provides transportation service in both its gas supply and market
areas. The principal industries served directly by Sonat's pipeline systems and
indirectly through their customers' distribution systems include the electric
generation, chemical, pulp and paper, textile, primary metals, stone, clay, and
glass industries.
 
                                      I-13
<PAGE>   17
 
     Transportation volumes in 1997 for Southern and all of its subsidiaries
were 1,007 Bcf, compared with transportation volumes in 1996 of 983 Bcf. Sales
to distribution customers, including municipalities and gas districts, accounted
for most of 1997 sales of 65 Bcf and 1996 sales of 69 Bcf. In each of 1997 and
1996, the volumes associated with the 1997 and 1996 sales are not accounted for
as sales volumes, but rather are included in transportation volumes because all
sales are made at the receipt points where the gas enters Southern's pipeline
system. In 1997 Florida Gas transported 471 Bcf of natural gas, compared to 457
Bcf in 1996.
 
     Sonat's pipelines provide transportation service under rate schedules that
are subject to FERC regulatory authority. Rates for transportation service
depend on whether service is on a firm or interruptible basis and the location
of the service on Southern's pipeline system. Firm service is transportation
service for which the shipper pays a fixed monthly fee to reserve capacity in
the pipeline system (the "Reservation Fee"). The shipper may not use this
capacity it has reserved at all times, but the firm transportation customers of
Southern and Florida Gas (with the exception of certain small customers) must
pay the monthly Reservation Fee regardless of the volumes shipped. Shippers are
able to resell their unused firm capacity pursuant to FERC rules and
regulations. Interruptible service is only available when pipeline capacity is
available and may be interrupted by the pipeline as needed when use of the
pipeline is at its greatest, typically during winter periods. For most
pipelines, including Southern and Florida Gas, FERC requires a rate design,
known as straight-fixed-variable ("SFV"), that is designed to allow pipelines to
recover substantially all of their fixed costs, a return on their equity
investment in facilities, and income taxes in the Reservation Fee. Pipelines
charge transportation rates for interruptible service for actual volumes
transported. Rates for transportation service are discounted by Southern and
Florida Gas in individual instances to respond to competition in the markets
they serve.
 
     Southern's and Florida Gas' contracts to provide firm transportation
service for their customers are for varying amounts and periods of time. The
following chart describes the amount of firm transportation service expiring
each year under the various firm transportation agreements of Southern and
Florida Gas with their firm transportation customers.
 
                             EXPIRATION SCHEDULE OF
                         FIRM TRANSPORTATION CONTRACTS
                                   (MCF/DAY)
 
<TABLE>
<CAPTION>
YEAR                                                          SOUTHERN     FLORIDA GAS
- ----                                                          ---------    -----------
<S>                                                           <C>          <C>
1998........................................................    176,653        10,210
1999........................................................    107,857         6,593
2000........................................................    125,407       404,643
2001........................................................     21,694         9,625
2002........................................................    724,125           -0-
2003........................................................    278,341         5,020
2004........................................................     43,254         6,854
2005........................................................    147,787       404,642
2006........................................................     45,108         5,083
2007........................................................    306,433        29,009
2008........................................................    350,609           -0-
Beyond 2008.................................................     35,140       516,931
                                                              ---------     ---------
          Total.............................................  2,362,408     1,398,610
</TABLE>
 
     Substantially all of the firm transportation capacity currently available
in Southern's two largest market areas is fully subscribed. Nearly all of
Southern's firm transportation contracts contain evergreen provisions that
automatically extend the term for additional months or years unless notice of
termination is given by one of the parties. There can be no assurance that the
existing customers of Southern or Florida Gas will extend their firm service
agreements at the same levels when their current service agreements expire.
 
                                      I-14
<PAGE>   18
 
     Transportation and sales by Southern, combined with sales by Sonat
Marketing, to one distribution customer, AGLC and its subsidiary, Chattanooga
Gas Company ("Chattanooga"), accounted for approximately four percent of Sonat's
1997 consolidated revenues. Transportation and sales by Southern to AGLC and
Chattanooga accounted for approximately 33 percent of Southern's 1997
consolidated revenues. Transportation and sales by Southern, combined with sales
by Sonat Marketing, to another distribution customer, Alabama Gas Corporation
("Alabama Gas"), accounted for approximately three percent of Sonat's 1997
consolidated revenues. Transportation and sales by Southern to Alabama Gas
accounted for approximately 12 percent of Southern's 1997 consolidated revenues.
No other customer accounted for as much as ten percent of Southern's
consolidated revenues for 1997.
 
     Sonat's pipelines hold easements acquired through either purchase or
condemnation for all of their pipeline rights-of-way. Such easements remain
valid until the pipeline traversing it is abandoned. Each company has the power
of eminent domain if needed in connection with acquiring additional
rights-of-way for expansion projects.
 
     Sonat's pipeline businesses are subject to operating risks associated with
the transmission of natural gas through a pipeline system, which could result in
property damage and personal injury. Sonat has a comprehensive safety program to
address these risks. Southern has consistently ranked at or near the top of its
industry peer group in safety performance. Sonat maintains broad insurance
coverage on behalf of Southern and its other subsidiaries insuring against
financial loss resulting from these operating risks.
 
     For additional information regarding Southern's transportation of gas, see
Management's Discussion and Analysis of Financial Condition and Results of
Operations contained in Part II of this report.
 
MARKETS -- SYSTEM EXPANSIONS
 
     Southern continually seeks to expand its pipeline system (i) to reach new
markets, (ii) to increase delivery capacity to existing markets to serve the
increasing gas demands in its market area, and (iii) to connect new gas
supplies, principally in the Gulf of Mexico, to deliver gas not only into
Southern's system but also into the interstate pipeline grid.
 
     Demand for natural gas in the six Southeastern states that comprise
Southern's principal market area, Alabama, Florida, Georgia, Mississippi, South
Carolina, and Tennessee, has grown at an annual average rate of 4.0 percent in
the last ten years, compared to the national annual average growth rate for gas
demand of 3.1 percent during such period. Natural gas demand in peninsular
Florida, the principal market served by Florida Gas, has grown even faster, at
an annual rate of 5.6 percent in the last ten years.
 
     In November 1997 Southern completed a $36 million market-area expansion
that added 46 MMcf per day of firm capacity to its pipeline system, most of
which is for industrial customers in Georgia. Southern has also entered into
agreements for expansions of its system to serve markets in eastern Tennessee
and northern Alabama. These two expansions have a total filed capital cost of
$119 million. The East Tennessee expansion is anticipated to go in service in
November 1998, subject to FERC approval of an application that Southern filed in
May 1997, and will provide capacity of 65 MMcf of natural gas per day to
customers in eastern Tennessee, Georgia, and Alabama. The North Alabama
expansion, which received FERC approval in May 1997, is now anticipated to go in
service in the fall of 1999, subject to FERC approval of an application that
Southern filed in February 1998 to change the route of the pipeline as it
crosses the Wheeler National Wildlife Refuge. The 122-mile expansion will
provide 76 MMcf per day of capacity to the participating customers.
 
     In addition to the general growth in gas demand throughout the Southeast,
the use of natural gas to generate electric power represents a significant
growth prospect in the market areas of Southern and Florida Gas. Since 1994
electric utilities served by Southern have added 23 gas-fired combustion turbine
generation units with generating capacity of 1,980 megawatts. These units, which
have consumed in excess of 200 MMcf of natural gas on a peak day, are used
primarily to meet the utilities' peak generation loads in the summer and winter
months.
 
                                      I-15
<PAGE>   19
 
     In March 1998 Southern received FERC approval for a $7 million expansion of
its pipeline system that will add 34 MMcf per day of firm capacity. The largest
customer for the project is Alabama Power Company, which will utilize its
capacity to serve the energy requirements of a 100 megawatt base load gas-fired
electric generation facility near Selma, Alabama. This expansion is expected to
be in service by November 1998.
 
     In February 1998 Florida Gas received FERC approval to install pipeline
facilities to add approximately seven MMBtu per day of firm capacity to serve
Florida Power Corporation's Anchlote Plant in Pasco County, Florida, that is
converting from oil-fired units to combined oil- and gas-fired units. The
conversion is scheduled to be completed in the fall of 1998 and will result in a
gas-use capability of up to 100,000 MMBtu per day. Also scheduled to commence
service the fall of 1998 is Florida Power Corporation's Hines Energy Complex
located in Polk County, Florida. This 470-megawatt combined cycle unit will have
a gas use capability of approximately 65,000 MMBtu per day when fully
operational. Due to the growing energy demand in the State of Florida, coupled
with the need for additional electric generation facilities, Florida Gas is
currently evaluating the need for a pipeline expansion that would go in-service
in the year 2000-2001 time frame.
 
     Another growth area for Sonat's pipeline business is in expanding
production area pipeline capacity to receive and transport increased levels of
gas production from the Gulf of Mexico, particularly in deeper waters. In March
1997 Southern placed in service a $14 million expansion project that allows
producers to transport, under 10-year contracts, 140 MMcf per day of natural gas
from offshore Louisiana to interconnections between Southern and other pipelines
in south Louisiana. In addition, as described above, construction of the Destin
pipeline system is underway with first deliveries expected in July 1998. Destin,
which connects with five interstate pipelines in Mississippi, including Southern
and Florida Gas, will enable producers to deliver gas from the eastern deepwater
Gulf of Mexico to interstate markets. In February 1998 Destin filed for FERC
approval to extend its pipeline system approximately 14 miles to transport
additional gas reserves that are committed to Destin's system. This extension,
which will cost approximately $19 million, is expected to be in service in late
1998, subject to FERC approval.
 
     Under FERC regulations, a pipeline is permitted to charge rates that are
designed to recover fully its cost of providing service to the pipeline's
customers, including a reasonable rate of return on its equity investment in the
facilities it uses to provide its service, which is referred to as the rate base
of the pipeline. The cumulative effect of capital investment required to serve
the existing and pending projects in the three growth segments of Sonat's
pipeline business described above -- market area, electric generation, and
production area demand -- together with capital investment for necessary
pipeline repair and replacements, has resulted in the growth in rate base for
Sonat's pipeline businesses as shown in the table below.
 
                       RATE BASE (IN MILLIONS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                               SOUTHERN AND     FLORIDA
YEAR                                                          SUBSIDIARIES(1)   GAS(2)
- ----                                                          ---------------   -------
<S>                                                           <C>               <C>
1994........................................................         735           239
1995........................................................         735         1,250
1996........................................................         768         1,236
1997........................................................         843         1,218
1998 (Estimated)............................................       1,056         1,212
1999 (Estimated)............................................       1,225         1,190
</TABLE>
 
- ---------------
 
(1) Includes portionate shares of the rate bases of Destin, Etowah, and other
    joint ventures attributable to Southern's ownership interests.
(2) 100 percent of the rate base of Florida Gas, which is 50-percent owned by
    Sonat.
 
     The amounts estimated for 1998 and 1999 in the foregoing table include (i)
currently planned capital expenditures for those years for maintenance, repair,
and replacement of the pipeline system, (ii) projects that have received FERC
approval and are currently under construction, and (iii) projects that have been
agreed to but for which FERC approval has not yet been obtained. No assurance
can be given that such projects, which are subject to protest by customers, the
staff of the FERC, and other interested parties, such as environmental
                                      I-16
<PAGE>   20
 
groups, will be approved by the FERC or, if approved, that such construction
will not be delayed for environmental, weather, or other reasons. A pipeline
cannot reflect a change in its rate base in its rates until it files a new rate
case and a pipeline's rate of return is subject to change every time it files a
new rate case. Consequently, there can also be no assurance that the rate of
return a pipeline is permitted by the FERC to earn on its rate base in the
future will be equal to the returns effectively earned in the past. Thus, the
changes in rate base projected above do not necessarily equate to an expected
change in earnings.
 
GAS SALES AND SUPPLIES
 
     As a result of its restructuring pursuant to FERC directive, Southern
terminated or renegotiated to market pricing substantially all of its gas supply
contracts through which it had historically obtained its long-term gas supply.
During 1997 two of Southern's existing long-term gas supply contracts expired,
reducing the number remaining from seven to five. Pending the termination or
expiration of the few remaining supply contracts, Southern's remaining gas
supply is being sold on a month-to-month basis. Except for such sales,
Southern's participation in gas supply activities will be limited to the
purchase and sale of volumes of gas from time to time as may be required for
system management purposes.
 
RATE AND REGULATORY PROCEEDINGS
 
     Periodically, Southern and its subsidiaries and Florida Gas make general
rate filings with the FERC to provide for the recovery of cost of service and a
return on equity. The FERC normally allows the filed rates to become effective,
subject to refund, until it rules on the approved level of rates. Southern and
its subsidiaries and Florida Gas provide reserves relating to such amounts
collected subject to refund, as appropriate, and make refunds upon establishment
of the final rates.
 
     At December 31, 1997, Southern's currently effective rates are established
by a settlement that was approved by a FERC order issued in 1995, which order is
now final and nonappealable. All of Southern's customers are parties to the
settlement. Under the terms of the settlement, Southern is required to file a
new rate case no later than September 1, 1999, to become effective by March 1,
2000.
 
     The currently effective rates of Florida Gas were established by an
uncontested settlement that was approved by the FERC in September 1997. The
settlement provides that, except in certain limited circumstances, Florida Gas
will not file a general rate case to be effective prior to October 1, 2000, but
it must file a new rate case no later than October 1, 2001.
 
STORAGE FIELDS
 
     Southern owns and operates Muldon Storage Field ("Muldon"), a large
underground natural gas storage field in Mississippi connected to its pipeline
system. The certificated working storage capacity of Muldon is 31 Bcf of gas.
Southern and Tennessee Gas Pipeline Company ("Tennessee"), a subsidiary of El
Paso Energy Corporation, an unaffiliated company, each owns 50-percent of the
Bear Creek Storage Field ("Bear Creek"), an underground natural gas storage
field located in Louisiana. Southern operates Bear Creek, which provides storage
service to Southern, Tennessee, and their customers. Bear Creek has a total
certificated working storage capacity of 65 Bcf of gas, half of which is
committed to Southern.
 
COMPETITION AND CURRENT BUSINESS CONDITIONS
 
     The natural gas transmission industry, although regulated, is very
competitive. Customers purchase gas supply from producers and gas marketing
companies in unregulated transactions and contract with Southern for
transportation and storage services to deliver such gas supply to their markets.
Southern's three largest customers are each able to obtain a significant portion
of their natural gas requirements through transportation by other pipelines. In
addition, Southern competes with several pipelines for the transportation and
storage business of many of its other customers. The competition with such
pipelines is intense, and Southern and Florida Gas must at times discount their
transportation rates in order to maintain market share and revenues.
 
                                      I-17
<PAGE>   21
 
     Natural gas is sold in competition principally with fuel oil, coal,
liquefied petroleum gases, electricity, and heavy crude oil. An important
consideration in Southern and Florida Gas' markets is the ability of natural gas
to compete with alternate fuels, which are fuels to which a potential end user
of gas may switch depending on the price of the fuel and other factors. Residual
fuel oil, the principal competitive alternate fuel in Southern and Florida Gas'
market area, has been at certain times in the past, and may be at times in the
future, priced at or below the comparable price of natural gas in industrial and
electric generation markets. Some parts of Southern's market area are also
served by one or more other pipeline systems that can provide transportation as
well as sales service in competition with Southern.
 
     As described above, for most pipelines FERC requires the SFV rate design
that is designed to permit pipelines to recover substantially all of their fixed
costs, a return on equity, and income taxes in the capacity reservation
component of their rates. The firm transportation customers of Southern and
Florida Gas (with the exception of certain small customers) must pay these
reservation charges regardless of the volumes shipped. Accordingly, the SFV rate
design should result in relative stability in the revenues, earnings, and cash
flows of interstate pipelines, including Southern and Florida Gas, compared to
other rate design methodologies. This is particularly true at Florida Gas, which
faces intense competition in the Florida market from residual fuel oil that
affects the volumes of gas it transports. There can be no assurance, however,
that the existing customers of Southern or Florida Gas will extend their firm
service agreements at the same levels when their current service agreements
expire. As described above, Destin's rates are designed to recover all of its
fixed and variable costs, including a return on equity and income taxes, through
a volumetric rate design. In order to receive firm service at a volumetric rate,
Destin's customers must commit to Destin all of their gas production from
certain specified areas. Sea Robin's customers principally subscribe for
interruptible service, so its revenues are highly dependent on the volumes of
gas it transports.
 
                                      I-18
<PAGE>   22
 
                            (SONAT PIPELINE SYSTEMS MAP)
 
                                      I-19
<PAGE>   23
 
                                ENERGY SERVICES
 
SONAT ENERGY SERVICES COMPANY
 
     Sonat Energy Services, which is a wholly owned subsidiary of Sonat, acts as
a holding company for Sonat's companies engaged in natural gas and electric
power marketing, power generation, and intrastate natural gas transmission.
 
     SONAT MARKETING COMPANY L.P.  Sonat Marketing is one of the ten largest
natural gas marketers in the United States. Its principal offices are in
Birmingham, Alabama and Houston, Texas. It also has regional offices in Tyler,
Texas, Oklahoma City, Oklahoma, Boston, Massachusetts, and Atlanta, Georgia. It
purchases natural gas from gas producers, interstate pipelines, and other
marketing companies and resells the gas to industrial and commercial users, gas
distribution companies, gas pipelines, and other marketing companies throughout
much of the United States, principally the area east of the Rocky Mountains.
Sonat Marketing also offers a variety of risk-management, transportation, and
storage services to its customers. Sonat Marketing continued to expand its
natural gas marketing business in 1997, when it sold 1,288 Bcf of natural gas
compared to sales of 968 Bcf in 1996. Its daily natural gas sales volumes were
4.2 Bcf per day at the end of 1997 compared to 3.3 Bcf per day at the end of
1996. A map showing Sonat Marketing's areas of operations appears on page I-22.
 
     Sonat Marketing purchases at index-based prices all of the natural gas
production of Exploration that is not sold under pre-existing term dedications.
Sonat Marketing remarkets this gas as part of its marketing operations. Sonat
Marketing uses derivative financial instruments to manage the risks associated
with its own purchase and sale activities and the price volatility associated
with Exploration's natural gas and oil production. See Part II of this report in
Notes 1 and 3 of the Notes to Consolidated Financial Statements and in
Management's Discussion and Analysis of Financial Condition and Results of
Operations under the caption "Market Risk" for additional information regarding
its derivatives activities.
 
     SONAT PUBLIC SERVICE COMPANY L.L.C.  Sonat Public Service Company L.L.C.
("Sonat Public Service") was formed in December 1996 as a joint venture of Sonat
Marketing and PSNC Production Corporation, a wholly owned subsidiary of Public
Service Company of North Carolina, Inc., an unaffiliated company. Sonat Public
Service, which is headquartered in Charlotte, North Carolina, markets natural
gas and related services to small industrial and large commercial customers
throughout the Mid-Atlantic region, including the District of Columbia and the
states of North Carolina, South Carolina, Maryland, and Virginia. In addition,
Sonat Public Service provides gas supply management services to Public Service
Company of North Carolina as well as municipalities in the Mid-Atlantic region.
Sonat Public Service sold 17 Bcf of natural gas in 1997.
 
     UNICOM GAS SERVICES LLC.  Unicom Gas Services LLC ("Unicom Gas Services")
was formed in August 1997 as a joint venture of Sonat Marketing and Unicom
Energy Services Inc., a wholly owned subsidiary of Unicom Corporation, an
unaffiliated company. Unicom Gas Services, which is headquartered in Chicago,
Illinois, markets natural gas and related services to industrial and commercial
customers in the Midwest region. Unicom Gas Services sold 208 MMcf of natural
gas in 1997.
 
     SONAT POWER MARKETING L.P.  Power Marketing, which is headquartered in
Birmingham, Alabama, markets electric power throughout the area of the United
States east of the Rocky Mountains. Significant changes are under way in the
electric industry that create new opportunities for marketing companies. The
FERC has initiated, and more than half of the states are considering, regulatory
changes to promote competition and give purchasers of electricity choices other
than their traditional utilities, similar to the unbundling that occurred in
natural gas. Power Marketing was created to take advantage of these
opportunities through the expected growth of wholesale power marketing. A map
showing Power Marketing's areas of operations appears on page I-22.
 
     Power Marketing continued to grow rapidly during 1997. It increased its
staff by fifty percent and its sales volumes almost tripled from 3.0 million
megawatt hours in 1996 to 8.8 million megawatt hours in 1997. Its average
trading volume increased from approximately 530 megawatts per hour at the end of
1996 to
 
                                      I-20
<PAGE>   24
 
approximately 1,280 megawatts per hour at the end of 1997. Despite its rapid
growth, however, Power Marketing is not yet profitable in the extremely
competitive power marketing business.
 
     Like Sonat Marketing, Power Marketing also utilizes derivative instruments
in managing commodity price risk. See Part II of this report in Notes 1 and 3 of
the Notes to Consolidated Financial Statements and in Management's Discussion
and Analysis of Financial Condition and Results of Operations under the caption
"Market Risk" for additional information regarding its derivatives activities.
 
     SONAT POWER INC.  Sonat Power Inc. ("Sonat Power") is a wholly owned
subsidiary of Sonat Energy Services. In February 1998 Sonat Mid-Georgia L.L.C.
("Sonat Mid-Georgia"), a wholly owned subsidiary of Sonat Power, acquired a
fifty-percent limited partnership interest in Mid-Georgia Cogen L.P., which owns
and will operate an approximate 300 megawatt electric power plant in Georgia.
The remaining fifty percent is owned by NCP Perry Incorporated, as a limited
partner, and NCP Houston Power Incorporated, as both a limited and a general
partner, both of which are wholly owned subsidiaries of GPU, Inc., an
unaffiliated company. Sonat Mid-Georgia paid $11.5 million in cash for its
interest and will make an equity contribution of $16 million when the plant goes
into commercial operation, which is scheduled to occur in the second quarter of
1998. This project is supported by a long-term power sales agreement as well as
a long-term fuel purchase agreement.
 
     Sonat Power is also the joint owner, with The AES Corporation, an
unaffiliated company, of a project to construct a natural gas-fueled power plant
near San Francisco, California. Because of regulatory and other developments,
the current outlook for and timing of this project are uncertain.
 
     SONAT INTRASTATE-ALABAMA INC.  Sonat Intrastate-Alabama Inc. ("SIA"), a
wholly owned subsidiary of Energy Services, owns an approximately 450-mile
intrastate pipeline system extending from natural gas fields and coal seam gas
production areas in the Black Warrior Basin in northwest and central Alabama to
connections with customers in Alabama, as well as interconnections with three
other pipelines, including Southern. SIA's throughput in 1997 was approximately
42 Bcf compared to 38 Bcf in 1996.
 
SONAT POWER SYSTEMS INC.
 
     Sonat Power Systems Inc. ("Sonat Power Systems"), a wholly owned subsidiary
of Sonat, formed a strategic alliance in 1997 with AlliedSignal Power Systems
Inc., a wholly owned subsidiary of AlliedSignal Inc., an unaffiliated company,
to market and support AlliedSignal's TurboGenerator(TM) products. The
TurboGenerator(TM) unit is a small, self-contained 75-kilowatt power source
fueled by natural gas. The size is ideal for smaller commercial establishments,
but these units can also be used together to meet the power needs for larger
applications. Through this alliance, Sonat Power Systems is the exclusive
distributor of the TurboGenerator(TM) unit in 13 Southern states from Texas to
Virginia, plus the District of Columbia.
 
COMPETITION AND CURRENT BUSINESS CONDITIONS
 
     Competition in the gas marketing and power marketing businesses is intense
and is expected to remain so due to the large number of industry participants,
although there is a trend toward consolidation in the gas marketing industry.
 
     Sonat Marketing's operating income increased slightly in 1997 compared to
1996. Although margins remained under pressure, increased origination activity
in the fourth quarter of 1997 resulted in increases in mark-to-market income and
helped to offset a decrease in unit margins. Both Sonat Marketing and Power
Marketing expect margins to remain under intense pressure in 1998.
 
                                      I-21
<PAGE>   25
 
                  (SONAT ENERGY SERVICES AREAS OF OPERATIONS MAP)
 
                                      I-22
<PAGE>   26
 
                            GOVERNMENTAL REGULATION
 
EXPLORATION AND PRODUCTION
 
     The federal government and the states in which Exploration and Sonat GOM
have oil and gas production and own interests in producing properties regulate
various matters affecting Exploration's and Sonat GOM's oil and gas production,
including the drilling and spacing of wells, conservation, forced pooling, and
protection of correlative rights among interest owners.
 
     The operations of Exploration and Sonat GOM under federal oil and gas
leases are subject to certain statutes and regulations of the U.S. Department of
the Interior that currently impose liability upon lessees for the cost of
clean-up of pollution resulting from their operations. Royalty obligations on
all federal leases are regulated by the MMS, which has promulgated valuation
guidelines for the payment of royalty by producers. To the extent the MMS
finally determines valuation based on a method other than actual sales proceeds
received, producers could be required to pay royalties at a rate higher than
actual sales proceeds.
 
     Other federal, state, and local laws and regulations relating to the
protection of the environment may affect Exploration's and Sonat GOM's oil and
gas operations, both directly and indirectly, through their effect on the
construction and operation of facilities, drilling operations, production, or
the delay or prevention of future offshore lease sales. Sonat maintains
substantial insurance on behalf of Exploration and Sonat GOM for oil pollution
liability. Exploration and Sonat GOM are also subject to various governmental
safety regulations in the jurisdictions in which they operate.
 
NATURAL GAS TRANSMISSION
 
     Southern, its interstate transmission subsidiaries, and Florida Gas are
subject to regulation by the FERC under the NGA and the NGPA.
 
     The NGA grants to the FERC authority to regulate the construction and
operation of pipeline and related facilities utilized in the transportation and
sale of natural gas in interstate commerce, including the extension,
enlargement, or abandonment of such facilities. Southern, its interstate
transmission subsidiaries, and Florida Gas hold required certificates of public
convenience and necessity issued by the FERC authorizing them to construct and
operate all pipelines, facilities, and properties now in operation for which
certificates are required, and to transport and sell natural gas in interstate
commerce.
 
     The FERC also has authority to regulate the transportation of natural gas
in interstate commerce and the sale of natural gas in interstate commerce for
resale. Although the FERC retains jurisdiction over their resale rates Southern,
Florida Gas, and other interstate pipeline companies are permitted to charge
market-based rates for gas sold in interstate commerce for resale.
Transportation rates of interstate pipeline companies remain regulated. The
maximum transportation rates for gas delivered by SIA into interstate commerce
are also regulated by the FERC. As necessary, Southern, its interstate
transmission subsidiaries, Florida Gas, and SIA file with the FERC applications
for changes in their transportation rates and charges designed to allow them to
recover fully their costs of providing such service to their customers,
including a reasonable rate of return on their investment in facilities. These
rates are normally allowed to become effective, subject to refund, until such
time as the FERC rules on the actual level of rates. See "Rate and Regulatory
Proceedings" above.
 
     In January 1995 Sea Robin filed with the FERC a petition for a declaratory
order that its pipeline system is engaged in the gathering of natural gas and
is, therefore, exempt from FERC regulation under the NGA. In June 1995 the FERC
denied Sea Robin's petition on the basis that the primary function of the Sea
Robin system is the interstate transportation of gas. Sea Robin's request for
rehearing of that ruling was denied by the FERC in June 1996. Sea Robin
subsequently appealed those FERC orders to the Fifth Circuit Court of Appeals.
In October 1997 the Fifth Circuit vacated and remanded the FERC's decision to
deny Sea Robin's petition and found that the FERC did not give adequate
consideration to the physical and operational characteristics of Sea Robin in
applying the primary function test.
 
                                      I-23
<PAGE>   27
 
     Southern, its natural gas transmission subsidiaries, Florida Gas, and SIA
are subject to the Natural Gas Pipeline Safety Act of 1968, as amended, which
regulates pipeline and LNG plant safety requirements, and to the National
Environmental Policy Act and other environmental legislation. Each of them has a
continuing program of inspection designed to keep all of their facilities in
compliance with pollution control and pipeline safety requirements and believe
that they are in substantial compliance with applicable requirements. Southern's
capital expenditures to comply with environmental and pipeline safety
regulations were approximately $3 million in 1997 and $8 million in 1996.
Southern anticipates that such expenditures will be approximately $3 million in
1998.
 
ENERGY SERVICES
 
     Gas sold by Sonat Marketing and other marketing companies is not regulated
by the FERC. Power Marketing is subject to the regulatory jurisdiction of the
FERC under the Federal Power Act with respect to rates, terms and conditions of
service, and certain reporting requirements, including Power Marketing's sales
in the wholesale power market. Power Marketing sells wholesale power under its
market-based rate schedule, which has been approved by and is on file with the
FERC.
 
                             ENVIRONMENTAL MATTERS
 
     Various environmental matters relating to, or that could affect, Sonat or
one or more of its subsidiaries are described in Part II of this report in
Management's Discussion and Analysis of Financial Condition and Results of
Operations under the caption "Environmental Issues," which is incorporated
herein by reference.
 
                               YEAR 2000 PROJECT
 
     The year 2000 issues as they relate to Sonat are discussed in Part II of
this report in Management's Discussion and Analysis of Financial Condition and
Results of Operations under the caption "Year 2000 Project," which is
incorporated herein by reference.
 
                        CAUTIONARY STATEMENT CONCERNING
                           FORWARD-LOOKING STATEMENTS
 
     This report, including the information incorporated by reference herein,
contains forward-looking statements regarding the Company's business plans and
prospects, objectives, future drilling plans, expansion projects, proposed
capital expenditures, and expected performance or results. These forward-looking
statements are based on assumptions that the Company believes are reasonable,
but are subject to a wide range of risks and uncertainties and, as a result,
actual results may differ materially from those expressed in such
forward-looking statements. Important factors that could cause actual results to
differ include changes in oil and gas prices and underlying demand, which would
affect profitability and might cause the Company to alter its plans; the timing
and success of the Company's exploration and development drilling programs,
which would affect production levels and reserves; the results of the Company's
hedging activities; risks incident to the drilling and operation of oil and gas
wells; future drilling, production and development costs and the success of the
Company's internal cost reduction activities; and the requirements to receive
various governmental approvals to proceed with expansion projects at Southern,
Destin, and Etowah. Realization of the Company's objectives and expected
performance can also be adversely affected by the actions of customers and
competitors, changes in governmental regulation of the Company's businesses, and
changes in general economic conditions and the state of domestic capital
markets.
 
ITEM 2.  PROPERTIES
 
     A description of Sonat's and its subsidiaries' principal properties is
included under Item 1. Business above and is hereby incorporated by reference
herein.
 
                                      I-24
<PAGE>   28
 
ITEM 3.  LEGAL PROCEEDINGS
 
     For information regarding various environmental matters relating to, or
that could affect, Sonat or one or more of its subsidiaries, see Management's
Discussion and Analysis of Financial Condition and Results of Operations in Part
II of this report under the caption "Environmental Issues."
 
     Arcadian Corporation v. Southern Natural Gas Company and Atlanta Gas Light
Company was filed in January 1992 in the U.S. District Court for the Southern
District of Georgia. This lawsuit was filed against Southern and AGLC for
alleged violation of the antitrust laws in connection with Southern's refusal to
provide direct service to the plaintiff, Arcadian Corporation ("Arcadian").
Arcadian claims actual damages of at least $15 million, which could be trebled
under the antitrust laws. Southern and Arcadian executed an agreement settling
this lawsuit in November 1993. The settlement provides that the lawsuit will be
dismissed with prejudice upon final, nonappealable approval by the FERC of the
direct connection and transportation service requested by Arcadian. Pending such
approval the lawsuit has been stayed. In May 1994 the FERC issued an order
granting such approval. AGLC and others sought rehearing of this order. AGLC
also filed a petition for review of such order in the 11th Circuit Court of
Appeals. The FERC denied the requests for rehearing in an order issued in
November 1996 and AGLC and another customer have also filed petitions for review
of that order in the 11th Circuit Court of Appeals. While management believes it
has meritorious defenses and intends to defend the suit vigorously if the stay
were to be lifted, given the inherently unpredictable nature of litigation and
the relatively preliminary state of discovery in the case, management is unable
to predict the ultimate outcome of the proceeding if it were to go forward.
Management is not in a position to determine what, if any, damages would be
awarded against it if Arcadian were to prevail on one or more of its claims.
 
     Aline Moye v. Exxon Corporation, et al. is a class action lawsuit filed in
state court in Monroe County, Alabama in January 1998 on behalf of royalty
owners in the Big Escambia Creek Gas Field ("Field") in Alabama, against Exxon
Corporation, a gas producer in the Field, Southern, which purchased or
transported gas from the Field, and five other named defendants, alleging that
the methods used by the defendants to measure the heating content and volume of
natural gas produced from the Field have caused the producer(s) of this gas to
underpay royalties owed to the royalty owners. The complaint seeks recovery of
actual damages based upon the allegedly unpaid royalties as well as punitive
damages, the amount of which are not specified in the complaint. Although it
cannot predict the outcome, Southern believes that the methods of measurement
were appropriate and intends to defend the suit vigorously.
 
     Tennessee Gas Pipeline Company ("Tennessee") filed an application with the
FERC in December 1997 seeking to have the exchange agreement between Southern
and Tennessee, pursuant to which Southern delivers and receives gas to and from
the Bear Creek Storage Field at no charge, converted into a standard
transportation agreement by which Tennessee would charge Southern tariff rates
for providing that service. Tennessee asserts that the existing no-fee exchange
service, if provided at Tennessee's tariff rates for firm transportation
service, would result in $19 million of additional revenues to Tennessee
annually. Southern's management believes that even if Tennessee prevails in this
matter, the actual cost to Southern of obtaining firm transportation through
Tennessee or another third party pipeline would be significantly less than $19
million annually and that such costs would ultimately be recoverable through the
rates that Southern charges to its customers. Although it cannot predict the
outcome of the proceeding, Southern intends to oppose Tennessee's application
vigorously.
 
     Elizabeth A. Dunston v. Sonat Exploration Company was filed in state court
in Dewey County, Oklahoma on behalf of a class of Oklahoma royalty owners
seeking recovery of certain post-production costs that were deducted from
royalty payments otherwise due to them for the sale of gas from Oklahoma
properties. The case was certified as a class action in May 1996. Considering
the state of discovery and the unquantified nature of the class allegations,
neither the ultimate outcome of the lawsuit nor the amount of any potential
damage award can be determined. Settlement discussions are underway and
Management believes that the outcome of this proceeding will not have a material
effect on the Company's financial statements.
 
     Sonat and its subsidiaries are involved in a number of other lawsuits, all
of which have arisen in the ordinary course of business. Sonat does not believe
that any ultimate liability resulting from any of these other pending lawsuits
will have a material adverse effect on it.
                                      I-25
<PAGE>   29
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
     Sonat did not submit any matter to a vote of its security holders during
the fourth quarter of 1997.
 
EXECUTIVE OFFICERS OF THE REGISTRANT
 
<TABLE>
<CAPTION>
OFFICER                                                        OFFICE                     AGE
- -------                                                        ------                     ---
<S>                                          <C>                                          <C>
Ronald L. Kuehn, Jr........................  Chairman of the Board, President, and Chief
                                               Executive Officer........................  62
Donald G. Russell..........................  Vice Chairman..............................  66
William A. Smith...........................  Executive Vice President and General 
                                               Counsel..................................  53
Richard B. Bates...........................  Senior Vice President......................  44
James E. Moylan, Jr. ......................  Senior Vice President and Chief Financial
                                               Officer..................................  47
James A. Rubright..........................  Senior Vice President......................  51
Thomas W. Barker, Jr. .....................  Vice President -- Finance..................  53
Beverley T. Krannich.......................  Vice President -- Human Resources and
                                               Secretary................................  47
</TABLE>
 
     There is no family relationship between any of the above-named executive
officers.
 
     The officers of Sonat are elected annually by the Board of Directors. The
identification of an individual as an executive officer in this report does not
constitute a determination by Sonat or its Board of Directors that such
individual is an officer of Sonat for purposes of Section 16 of the Securities
Exchange Act of 1934.
 
     Ronald L. Kuehn, Jr. was elected Chairman of the Board of Sonat effective
March 28, 1986. Mr. Kuehn has served as Director of Sonat since April 30, 1981,
as President of Sonat since January 1, 1982, and as Chief Executive Officer of
Sonat since June 1, 1984, and currently serves in those capacities. Mr. Kuehn
also serves as Director of various Sonat subsidiaries.
 
     Donald G. Russell was elected Vice Chairman of Sonat effective April 24,
1997, and a Director of Sonat effective September 22, 1994, and currently serves
in those capacities. Mr. Russell also serves as Chairman and Chief Executive
Officer of Exploration.
 
     William A. Smith was elected Executive Vice President of Sonat effective
March 1, 1991, and General Counsel effective July 1, 1997, and currently serves
in those capacities. Mr. Smith also serves as Executive Vice President and
General Counsel of Exploration and Sonat Energy Services. During the past five
years Mr. Smith has served as an officer of Sonat, Exploration, Southern, and
Sonat Energy Services.
 
     Richard B. Bates was elected Senior Vice President of Sonat effective May
1, 1995, and currently serves in that capacity. Mr. Bates has served as
President of Sonat Energy Services and Sonat Marketing since January 1, 1994,
and Power Marketing since June 1, 1996. During the past five years Mr. Bates has
served as an officer of Exploration, Sonat Energy Services, and Sonat Marketing.
 
     James E. Moylan, Jr. was elected Chief Financial Officer of Sonat effective
July 1, 1997, and Senior Vice President of Sonat effective May 1, 1995, and
currently serves in those capacities. During the past five years Mr. Moylan has
served as an officer of Southern and Sonat.
 
     James A. Rubright was elected Senior Vice President of Sonat effective
April 1, 1995, and currently serves in that capacity. Mr. Rubright was elected
President of Southern effective July 1, 1997. Prior to his election as Vice
President and General Counsel of Sonat effective February 15, 1994, Mr. Rubright
had been a member of the Atlanta, Georgia law firm of King & Spalding.
 
     Thomas W. Barker, Jr. was elected Vice President -- Finance of Sonat
effective June 15, 1984, and currently serves in that capacity. Mr. Barker also
serves as Vice President -- Finance of Exploration and Southern.
 
     Beverley T. Krannich was elected Vice President -- Human Resources of Sonat
effective June 1, 1987, and Secretary of Sonat effective May 11, 1984, and
currently serves in those capacities. Ms. Krannich also serves as Vice
President -- Human Resources of Exploration and Southern.
 
                                      I-26
<PAGE>   30
 
                                    PART II
 
<TABLE>
<CAPTION>
  ITEM                                                                  PAGE
  ----                                                                  -----
<S>       <C>                                                           <C>
Item 5.   Market for the Registrant's Common Equity and Related
            Stockholder Matters.......................................  II-33
Item 6.   Selected Financial Data.....................................  II-45
Item 7.   Management's Discussion and Analysis of Financial Condition
            and Results of Operations.................................  II-2
Item 7A.  Quantitative and Qualitative Disclosures About Market
            Risk......................................................  II-12
Item 8.   Financial Statements and Supplementary Data.................  II-19
Item 9.   Changes in and Disagreements with Accountants on Accounting
            and Financial Disclosure..................................  II-47
</TABLE>
 
                             ---------------------
 
     The financial data following on pages II-2 through II-46 is reproduced
from, and the Table of Contents below is taken from, the Sonat Inc. Annual
Report to Stockholders for 1997. An index to the financial statements and
financial statement schedules may be found under Item 14. "EXHIBITS, FINANCIAL
STATEMENT SCHEDULES AND REPORTS ON FORM 8-K" in Part IV of this report.
 
                             ---------------------
 
                         FINANCIAL INFORMATION CONTENTS
 
<TABLE>
<S>                                                           <C>
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................  29
Report of Management........................................  44
Report of Ernst & Young, LLP, Independent Auditors..........  45
Consolidated Financial Statements...........................  46
     Consolidated Balance Sheets............................  46
     Consolidated Statements of Income......................  48
     Consolidated Statements of Changes in Stockholders'
      Equity................................................  49
     Consolidated Statements of Cash Flows..................  50
Notes to Consolidated Financial Statements..................  51
Selected Consolidated Financial Data........................  72
</TABLE>
 
                                      II-1
<PAGE>   31
Management's Discussion and Analysis of Financial Condition
and Results of Operations

Sonat Inc. and Subsidiaries


RESULTS OF OPERATIONS
Operating Income
Business segment operating results for Sonat Inc. and its subsidiaries (the
Company) are presented in the table below. The table also shows unusual items in
1997 and 1995 that affect operating income and net income comparisons. Each
significant unusual item is discussed in the respective segment discussions in
the following pages. The table is presented because management believes this
information enhances the analysis of results of operations.

<TABLE>
<CAPTION>
                                          (In Millions)
                                  --------------------------
Years Ended December 31,           1997      1996      1995
- ------------------------------------------------------------
<S>                               <C>       <C>       <C>     
Operating Income:
  Exploration and Production      $102.9    $161.9    $ 23.0
  Natural Gas Transmission         178.4     165.6     158.3
  Energy Services                   10.6      10.2       6.5
  Other                              5.3       3.6       1.1
- ------------------------------------------------------------
                                   297.2     341.3     188.9
- ------------------------------------------------------------
Unusual Items (Expense)
  Income Included Above:
  Exploration and Production
    Termination of gas sales
      contracts                       --        --      37.5
    Asset impairment               (39.0)       --     (23.0)
  Natural Gas Transmission
    Rate settlement and
      GSR costs                       --        --     (11.1)
- ------------------------------------------------------------
                                   (39.0)       --       3.4
- ------------------------------------------------------------
Operating Income Excluding
  Unusual Items                   $336.2    $341.3    $185.5
============================================================
</TABLE>


<TABLE>
<CAPTION>
                                        (In Millions,
                                  Except Per-Share Amounts)
                                 ---------------------------
Years Ended December 31,           1997      1996      1995
- ------------------------------------------------------------
<S>                               <C>       <C>       <C>   
Net Income As Reported            $175.9    $201.2    $192.9
- ------------------------------------------------------------

Unusual Items (Expense)
  Income Included Above:
  Exploration and Production
    Termination of gas sales
      contracts                       --        --      24.4
    Property sales                    --        --     (20.0)
    Sale of Sonat Offshore
      stock                           --        --     110.1
    Asset impairment               (25.4)       --     (14.9)
    Loss on futures contracts         --        --      (5.5)
  Natural Gas Transmission
    Rate settlement and
      GSR costs                       --        --      (6.8)
  Other
    Sale of Baker Hughes stock        --        --      (8.2)
- ------------------------------------------------------------
                                   (25.4)       --      79.1
- ------------------------------------------------------------
Net Income Excluding
  Unusual Items                   $201.3    $201.2    $113.8
============================================================
Earnings Per Share of
  Common Stock                    $ 2.05    $ 2.33    $ 2.24
============================================================
Earnings Per Share of
  Common Stock-Assuming
  Dilution                        $ 2.01    $ 2.30    $ 2.21
============================================================
Earnings Per Share of
  Common Stock Excluding
  Unusual Items                   $ 2.35    $ 2.33    $ 1.32
============================================================
Earnings Per Share of
  Common Stock Excluding
  Unusual Items-Assuming
  Dilution                        $ 2.30    $ 2.30    $ 1.31
============================================================
</TABLE>

EXPLORATION AND PRODUCTION

The Company is engaged in the exploration for and the acquisition, development
and production of oil and natural gas in the United States through Sonat
Exploration Company. Most of Sonat Exploration's natural gas production is sold
to Sonat Marketing Company L.P. (Sonat Marketing), the Company's affiliate
operating in the Energy Services segment.



                                       29
                                     
                                      II-2
<PAGE>   32

Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)


   Sonat Exploration continues to focus on exploration and development drilling
versus producing property acquisitions. The most prominent onshore exploration
area is the Cotton Valley Pinnacle Reef trend in east Texas. Sonat Exploration
drilled eight wells in the Cotton Valley Pinnacle Reef trend in 1997, six of
which were successful. In the first two months of 1998 Sonat Exploration
completed two more successful wells in the Cotton Valley Pinnacle Reef trend and
is in the process of completing another successful well.

   The Austin Chalk trend of east Texas and west Louisiana is also a very active
drilling area for the Company. During 1997, 27 wells were completed in the
Austin Chalk trend, of which 21 are commercial. The primary areas of
concentration for the Company are the Masters Creek and Hurricane Branch areas.

   Overall, during 1997 Sonat Exploration participated in the completion of 407
gross development wells, of which 384 were successful, and 14 exploratory wells,
of which nine were successful. At December 31, 1997, total proved reserves were
2.2 trillion cubic feet of natural gas equivalent.

   On January 30, 1998, the Company closed the merger with Zilkha Energy Company
for $1.3 billion (see Note 15 of the Notes to Consolidated Financial
Statements). Zilkha Energy was a privately owned exploration and production
company. It operates in the shallow waters of the Gulf of Mexico where it has
accumulated the industry's largest net leasehold position in the shallow-water
area. Zilkha Energy's offshore presence and technical expertise significantly
complement Sonat Exploration's onshore activities.

EXPLORATION AND PRODUCTION

<TABLE>
<CAPTION>
                                          (In Millions)
                                  --------------------------
Years Ended December 31,           1997      1996      1995
- ------------------------------------------------------------
<S>                               <C>       <C>       <C>   
Revenues:
  Sales to others                 $148.6    $155.3    $175.1
  Intersegment sales               409.9     410.4     228.4
- ------------------------------------------------------------
    Total Revenues                 558.5     565.7     403.5
- ------------------------------------------------------------
Costs and Expenses:
  Operating and maintenance         71.2      64.8      65.2
  Exploration expense               32.2      21.7       9.1
  General and administrative        58.6      53.9      48.4
  Depreciation, depletion and
    amortization                   269.3     236.4     239.2
  Taxes and other                   24.3      27.0      18.6
- ------------------------------------------------------------
                                   455.6     403.8     380.5
- ------------------------------------------------------------
Operating Income as Reported       102.9     161.9      23.0
Unusual Items                      (39.0)       --      14.5
- ------------------------------------------------------------
Operating Income Excluding
  Unusual Items                   $141.9    $161.9    $  8.5
============================================================
Equity in Earnings of
  Unconsolidated Affiliates       $  0.4    $  0.4    $  0.6
============================================================
Proved Reserves:
  Net gas (Bcf)                    1,850     1,692     1,506
  Net liquids (MBbls)             57,769    51,437    44,228
============================================================
Net Sales Volumes:
  Gas (Bcf)                          203       205       183
  Oil and condensate (MBbls)       4,612     5,145     3,973
  Natural gas liquids (MBbls)      1,764     2,161     1,496
============================================================
Average Sales Prices:
  Gas ($/Mcf)                     $ 2.18    $ 2.20    $ 1.52
  Oil and condensate ($/Bbl)       20.05     19.25     17.61
  Natural gas liquids ($/Bbl)      11.96     12.03      9.29
============================================================
</TABLE>

   1997 VERSUS 1996. Operating income decreased $20.0 million, after excluding
the recognition of a $39.0 million charge for the impairment of certain oil and
gas properties in 1997. The decrease in operating income is attributable
primarily to higher operating expenses and lower oil production. Oil and
condensate production declined 10 percent, primarily reflecting declines in the
Austin Chalk and certain Gulf of Mexico properties (see impairment discussion
below). The effect of these unfavorable items in 1997 was partially offset by
approximately $12 million of costs incurred in



                                       30

                                      II-3
<PAGE>   33

Sonat Inc. and Subsidiaries


1996 associated with the settlement of the Briggs, et al. v. Sonat Exploration
litigation. Additionally, oil and condensate prices increased 4 percent to
$20.05 per barrel compared with $19.25 per barrel in 1996.

   Costs and expenses increased 13 percent in 1997 as compared to the 1996
period. Operating and maintenance expense increased $6.4 million as a result of
a higher level of drilling activity. Exploration expense increased $10.5 million
as a result of increased seismic and lease write-off expense resulting from
increased exploration activity. General and administrative expense was higher
primarily due to $4.3 million of expenses related to the merger with Zilkha
Energy. Depreciation, depletion and amortization expense, excluding the
impairment provision in 1997, decreased slightly due to lower production
volumes.

   Sonat Exploration's 1997 production was lower than expected with most of the
shortfall attributable to certain Gulf of Mexico properties. In 1996, Sonat
Exploration completed two significant wells in High Island Block 39 that
together initially produced 89 million cubic feet of natural gas equivalent per
day, but these wells ceased production in 1997. In addition, other wells drilled
in this area during 1997 did not yield material reserves. As a result, it was
determined in the third quarter of 1997 that the remaining reserves for these
properties would not recover the associated book value, and the properties were
written down by $39.0 million.

   1996 VERSUS 1995. Operating income increased $153.4 million, after excluding
the recognition of $37.5 million of operating revenue from the termination of
two long-term gas sales contracts and a $23.0 million charge to depreciation,
depletion and amortization expense for an impairment provision related to the
adoption of Statement of Financial Accounting Standards (SFAS) No. 121,
Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
Be Disposed of, in 1995. The increase was primarily due to higher natural gas
prices. Increases in oil prices and gas and oil production also added
substantially to operating results. Average realized natural gas prices
increased to $2.20 per thousand cubic feet (Mcf) in 1996 from $1.52 per Mcf in
1995, an increase of 45 percent. Natural gas production increased by 12 percent
in 1996 compared to the 1995 period. Realized oil prices rose to an average of
$19.25 per barrel in 1996 from $17.61 per barrel in 1995, and oil and condensate
production increased by 29 percent primarily due to the successful development
drilling program in the Austin Chalk trend. Operating income for 1996 was
reduced by the cost of the judgment and plaintiffs' attorney's fees of
approximately $12 million for settlement of the Briggs, et al. v. Sonat
Exploration litigation.

   Costs and expenses were higher in 1996, excluding the SFAS No. 121
adjustment, due to several factors. Exploration expense increased $12.6 million
due to the higher level of exploration activity in 1996. General and
administrative expense increased $5.5 million due to higher employee related
costs, including stock-based compensation expense. Taxes and other expenses
increased $8.4 million primarily due to higher severance taxes related to higher
revenues. Depreciation, depletion and amortization expense increased $20.2
million, as higher production levels offset a lower amortization rate.

   HEDGING ACTIVITIES. Sonat Exploration, through Sonat Marketing, uses
derivative financial instruments to manage the risks associated with price
volatility for both its natural gas production and its oil production, which it
sells in the spot market. (See Market Risk and Notes 1 and 3 of the Notes to
Consolidated Financial Statements.) Gains or losses experienced on Sonat
Exploration's hedging transactions offset the changes in revenue recognized on
the sale of the commodity. Natural gas revenues were reduced by $40.8 million
and $24.7 million in the 1997 and 1996 periods, respectively, and increased by
$3.0 million in the 1995 period relating to hedging activities. Oil revenues
were reduced by $.5 million and $12.5 million in 1997 and 1996, respectively,
relating to hedging activities. The effect of hedging activities on oil revenues
in 1995 was immaterial.



                                       31

                                      II-4
<PAGE>   34

Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)


   A portion of Sonat Exploration's future gas production is hedged through the
year 2000. Sonat Exploration's hedged gas production is as follows:

<TABLE>
<CAPTION>
                           Volumes    Weighted Average Price
                           ---------------------------------
                            (Bcf)            (per Mcf)
 
<C>                        <C>        <C>  
- ------------------------------------------------------------
1998                         51.4              $2.17
1999                         56.4              $2.12
2000                         36.1              $2.15
- ------------------------------------------------------------
                            143.9              $2.15
============================================================
</TABLE>

NATURAL GAS TRANSMISSION

The Company is engaged in the natural gas transmission business through Southern
Natural Gas Company and its subsidiaries (Southern), and Citrus Corp. (a 50
percent-owned company). Southern and Citrus are actively pursuing opportunities
to expand their pipeline systems in their traditional market areas and to
connect new gas supplies.

   During 1997, Southern completed two pipeline expansions. In the first quarter
of 1997, Southern placed in service a $14 million expansion project that allows
producers to transport an additional 140 million cubic feet per day of natural
gas from offshore Louisiana through Southern's pipeline system as well as to
several other interstate pipelines. In November, Southern completed a $36
million market-area expansion that added 46 million cubic feet per day of firm
capacity, most of which is for customers in Georgia. Both of these expansions
are fully subscribed under contracts of 10 years or longer.

   In April 1997, units of Shell Oil Company and Amoco Corporation joined with
Southern in the ownership of Destin Pipeline, a 1 billion-cubic-feet-per-day,
$313 million pipeline designed to transport natural gas from deep-water
development in the eastern Gulf of Mexico. Southern has a one-third interest in
this pipeline. Shell and Amoco have made substantial firm transportation
commitments to this pipeline, and discussions are under way with other
prospective shippers. Construction of the pipeline began in December 1997, and
it is expected to be partially completed and in service by July 1998.

   Southern is moving forward on three expansions to eastern Tennessee, northern
Alabama, and central Alabama that have a total filed capital cost of $126
million. The North Alabama expansion, which received Federal Energy Regulatory
Commission (FERC) approval in May 1997, is now anticipated to go in service in
the fall of 1999, subject to FERC approval of an application that Southern filed
in February 1998 to change the route of the pipeline as it crosses the Wheeler
National Wildlife Refuge. The 122-mile expansion will provide 76
million-cubic-feet-per-day capacity to the participating customers. A second
expansion to serve customers in eastern Tennessee is anticipated to go in
service in November 1998, subject to FERC approval of an application that
Southern filed in May 1997. Southern has firm transportation commitments
totaling 65 million cubic feet of natural gas per day from customers in eastern
Tennessee, Georgia and Alabama related to this expansion. The expansion in
central Alabama is also expected to go in service in the fourth quarter of 1998,
subject to FERC approval. This expansion will provide 34 million cubic feet per
day of firm transportation to Alabama Power Company and two other customers.

    In December 1997, an affiliate of AGL Resources, Inc. and Southern formed a
new entity, Etowah LNG Company, L.L.C. (Etowah LNG), to jointly construct, own
and operate a new liquefied natural gas peaking facility in Polk County,
Georgia. Under the agreement, AGL Resources and Southern each will own 50
percent of Etowah LNG, which will be regulated by the FERC. The proposed plant
will connect directly into AGL Resources' principal natural gas distribution
subsidiary, Atlanta Gas Light Company, and Southern's pipeline. Etowah LNG will
provide natural gas storage and peaking services to Atlanta Gas Light and other
Southeastern customers. The new facility will cost approximately $90 million
with 300 million cubic feet per day of deliverability capacity. Affiliates of
AGL Resources will manage the construction of the facility and operate it.
Southern will provide administrative services. Etowah



                                       32

                                      II-5
<PAGE>   35
Sonat Inc. and Subsidiaries

LNG expects to file a certificate application with the FERC in March 1998.
Subject to receiving timely FERC approval, construction will begin in early 1999
in order to provide peaking services during the 2001-02 winter heating season.


Southern Natural Gas Company and Subsidiaries

<TABLE>
<CAPTION>
                                       (In Millions)
                                 ------------------------

Years Ended December 31,           1997     1996     1995
- ---------------------------------------------------------
<S>                               <C>      <C>     <C>    
Revenues(1):
   Market transportation
     and storage                  $313.2   $323.2  $324.5
   Supply transportation            48.5     46.6    50.6
   Other                            31.6     29.0    37.2
- ---------------------------------------------------------
     Total Revenues                393.3    398.8   412.3
- ---------------------------------------------------------
Costs and Expenses(1):
   Operating and maintenance        75.4     74.9    96.1
   General and administrative       71.3     91.6    85.4
   Depreciation and amortization    47.8     48.3    52.3
   Taxes, other than income         19.9     18.1    19.4
- ---------------------------------------------------------
                                   214.4    232.9   253.2
- ---------------------------------------------------------
Operating Income as Reported       178.9    165.9   159.1
Unusual Items                        -        -     (11.1)
- ---------------------------------------------------------
Operating Income Excluding
   Unusual Items                  $178.9   $165.9  $170.2
=========================================================
Equity in Earnings of
   Unconsolidated Affiliates      $ 11.8   $  9.6  $  9.4
=========================================================


                                     (Billion Cubic Feet)
- ---------------------------------------------------------
Volumes:
   Market transportation            611      630      609
   Supply transportation            396      315      372
   Intrastate(2)                      -       38       35
- ---------------------------------------------------------
     Total Volumes                1,007      983    1,016
=========================================================
   Transition gas sales              65       69       85
=========================================================
</TABLE>

(1) The 1996 and 1995 periods have been restated to reflect the reclassification
    of natural gas sales, natural gas cost and transition cost recovery to other
    revenues.
(2) Southern's investment in Sonat Intrastate-Alabama, a small intrastate
    pipeline subsidiary, was transferred to Sonat Inc. on January 1, 1997.


Citrus Corp.

<TABLE>
<CAPTION>
                                       (In Millions)
                                 ------------------------
Years Ended December 31,          1997     1996     1995
- ---------------------------------------------------------
<S>                              <C>      <C>     <C>    
Allocated Expenses Included in
   Operating Income              $   0.5  $   0.3 $   0.8
=========================================================
Equity in Earnings of
   Citrus Corp.                  $  28.7  $  22.9 $  28.2
=========================================================


                                   (Billion Cubic Feet)
- ---------------------------------------------------------
Florida Gas Volumes (100%):
   Market transportation            443      428      461
   Supply transportation             28       29       26
- ---------------------------------------------------------
     Total Volumes                  471      457      487
=========================================================
</TABLE>

    1997 Versus 1996. Operating income for the Natural Gas Transmission segment
for 1997 increased 8 percent compared with 1996.

    Southern Natural Gas - Operating income for Southern was $178.9 million in
1997 compared with $165.9 million in 1996. Operating results improved primarily
due to lower general and administrative expenses. Also favorably impacting
operating results were recent expansions and improved results at Sea Robin
Pipeline Company. Partly offsetting was warmer winter weather during 1997, which
negatively affected operating results.

    Market transportation revenues decreased primarily due to lower volumes
resulting from warmer weather and the transfer of Southern's ownership of a
small intrastate pipeline to Sonat, which was immaterial to operating results,
partially offset by increased revenues from expansions. Supply transportation
revenues increased due to higher volumes. Operating and maintenance expense
increased slightly primarily due to higher fuel expense. Both the 1997 and 1996
periods included positive effects related to the disposition of certain assets.
General and administrative expenses decreased primarily due to lower stock-based
compensation and employee benefit expenses in 1997 and a $9.0 million donation
to the Sonat Foundation in 1996.

    Equity in earnings of unconsolidated affiliates primarily represents the
Company's share of earnings from Bear Creek Storage Company and Destin Pipeline.
The

                                        33

                                      II-6


<PAGE>   36
Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)

increase in 1997 as compared to 1996 is primarily due to earnings resulting from
the allowance for funds used during construction (AFUDC) capitalized at Destin
Pipeline.

    Citrus - Equity in earnings of Citrus increased $5.8 million over 1996 to
$28.7 million. 1997 results reflect a gain recognized on the restructuring of
the marketing arrangement for Citrus Trading Company between Sonat and Enron
Corp. and a favorable adjustment to estimated state income taxes. The effect of
higher revenues at Florida Gas from higher rates in conjunction with its rate
filing that was effective in March 1997 and higher interruptible transportation
volumes were offset by a gain on sale of assets recognized in 1996, lower
trading margins at Citrus Trading and higher operating expenses.

    1996 VERSUS 1995. Absent the effect of an unusual item (see discussion
below), operating income for the Natural Gas Transmission segment decreased 2
percent in 1996 due to lower operating results at Southern.

    Southern Natural Gas - Operating income, excluding the unusual item
discussed below, decreased slightly in 1996 primarily due to incremental
revenues in 1995 from the sale of firm transportation capacity prior to revised
rates going into effect on March 1, 1995. Also included in 1995 are positive
adjustments to reflect actual interruptible transportation revenue and cost
recovery in the first year of post Order No. 636 operations, the reduction of a
take-or-pay liability and the accrual of gas supply realignment (GSR) interest
on larger recovery balances compared to 1996. These were partially offset by
lower costs and additional firm transportation revenues in 1996. Operating and
maintenance expense in 1995 included an $11.1 million unusual item in
recognition of Southern's share of GSR costs that were not recoverable.

    Certain other items affected operating income. Supply transportation
revenues decreased due to lower supply-area transportation volumes resulting
from lower throughput at Sea Robin. Operating and maintenance expense in 1995
included the $11.1 million of GSR expense which was discussed earlier. In
addition, operating and maintenance expense in 1996 also included positive
effects relating to the disposition of certain assets. General and
administrative expense increased due to higher stock-based compensation expense
and a $9.0 million donation to the Sonat Foundation in 1996, partly offset by
lower employee related expenses. Depreciation and amortization expense decreased
in 1996 primarily due to lower rates implemented March 1, 1995. 

    Equity in earnings of unconsolidated affiliates primarily represents the
Company's share of earnings from Bear Creek Storage Company. Equity in earnings
from Bear Creek was flat compared to 1995. 

     Citrus - Equity in earnings of Citrus was $5.3 million lower than in 1995.
1996 results reflect revenues and operating costs relating to the first full
year of operation of the Phase III expansion project while 1995 results include
accruing AFUDC for the first two months of the year and the $6.7 million effect
of a positive adjustment to AFUDC on Phase III in 1995. Also contributing to the
decline were lower margins due to lower interruptible transportation volumes as
a result of lower prices from competing fuels and lower margins at Citrus' gas
marketing affiliate. These were partly offset by a gain on the sale of
facilities in 1996 and the effect of out-of-period expense adjustments in 1996
and 1995.

Natural Gas Sales and Supply

As a result of FERC Order No. 636, Southern terminated or renegotiated to market
pricing substantially all of its gas supply contracts through which it had
historically obtained its long-term gas supply. Pending the termination of the
remaining supply contracts, Southern's remaining gas supply is sold on a
month-to-month basis. Gas sales revenue and natural gas cost are included in
other revenue. 

    Southern's annual purchase commitments total less than $25 million per year
for 1998 and subsequent years. Based on Southern's current expectations with
respect to natural gas prices in 1998 and the years following, only an
insignificant amount of gas volumes is expected to be at prices above market.

                                       34

                                      II-7


<PAGE>   37
Sonat Inc. and Subsidiaries

Rate Matters

Under terms of a settlement approved by the FERC, all of Southern's previously
pending rate proceedings and proceedings to recover GSR and other transition
costs associated with the implementation of FERC Order No. 636 have been
resolved. The settlement requires Southern to file a new rate case no later than
September 1, 1999.

ENERGY SERVICES

Sonat Energy Services, through its majority-owned subsidiaries, Sonat Marketing
and Sonat Power Marketing L.P. (Sonat Power Marketing), conducts marketing
activities in the natural gas and electric industries, respectively. Sonat
Marketing purchases and resells substantially all of Sonat Exploration Company's
natural gas production, as well as purchasing and reselling gas for numerous
other customers. Both of these subsidiaries utilize derivative instruments in
managing commodity price risk (see Market Risk and Notes 1 and 3 of the Notes to
Consolidated Financial Statements).

    Sonat Marketing's natural gas business has continued to grow rapidly. Sonat
Marketing's sales volumes increased 33 percent from 1996. This growth was
achieved in large part by the Company's continuing focus on its strategy of
working closely with its customers and delivering outstanding customer service.

    During 1997, Sonat Marketing formed Unicom Gas Services, a joint venture
with Unicom Energy Services Inc. Unicom Energy Services is a subsidiary of the
Unicom Corporation, one of the largest electric utilities in the Midwest. This
new business combines Sonat Marketing's natural gas expertise with Unicom's
marketing capabilities. The new company will market natural gas and related
services to commercial and industrial customers throughout the Midwest. This
follows a successful joint venture established in 1996 with PSNC Production
Corporation in the mid-Atlantic region.

    Sonat Power Marketing has executed electric power purchase, sales and
transmission agreements with numerous companies. Sonat Power Marketing has
remained focused on expanding its wholesale electric business, which is
evidenced by the significant growth in sales volumes. Sales volumes grew to 8.8
million megawatt hours in 1997 from 3.0 million megawatt hours in 1996. Another
subsidiary of Sonat Inc., Sonat Power Systems, has entered into a new
distributed power arrangement with AlliedSignal Power Systems, Inc. to market
its new onsite electric power systems in 13 Southern states and the District of
Columbia. 

    In addition, a new subsidiary of Sonat Energy Services acquired a 50
percent interest in a natural gas-fired power plant in Georgia in February 1998.
This transaction complements Energy Services' other businesses.


Energy Services

<TABLE>
<CAPTION>
                                    (In Millions)
                            ------------------------------
Years Ended December 31,      1997       1996       1995
- ----------------------------------------------------------
<S>                         <C>        <C>        <C>     
Revenues                    $3,723.9   $2,592.7   $1,249.9
==========================================================
Operating Income            $   10.6   $   10.2   $    6.5
==========================================================


                                (Billion Cubic Feet)
- ----------------------------------------------------------
Sonat Marketing Gas Sales
   Volumes (100%)              1,288        968        722
==========================================================


                            (Thousands of Megawatt Hours)
- ----------------------------------------------------------
Sonat Power Marketing
   Sales Volumes (100%)        8,768      2,969          4
==========================================================
</TABLE>


    1997 VERSUS 1996. Operating income for the energy services segment increased
slightly from last year's levels. The principal reason for the increase was the
recognition of mark-to-market income from origination activities in the fourth
quarter of 1997, which more than offset a decrease in unit margins. At the end
of 1997, Sonat Marketing's gas sales volumes reached 4.2 Bcf per day, up from
3.3 Bcf per day at the end of 1996. Sonat Power Marketing has also increased its
sales volumes sharply, but it is not yet profitable in the extremely competitive
power marketing business. Operating costs for the energy services segment
increased due to business growth.

                                       35

                                      II-8


<PAGE>   38
Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)

    1996 VERSUS 1995. Operating income for 1996 increased $3.7 million over 1995
levels primarily due to much higher unit gas trading margins in the first
quarter of 1996 as a result of unusually cold weather in certain of Sonat
Marketing's markets. This created intense demand for natural gas during peak
periods and resulted in a volatile price environment, which created exceptional
trading opportunities for Sonat Marketing. Since that time, unit trading margins
have been lower. Additionally, general and administrative expense increased due
to growth in operations. Sonat Marketing's volumes increased primarily due to a
concentration on growth and expansion of the Northeast and Midcontinent regions.
Sonat Power Marketing also experienced significant growth in 1996 and reached
sales volumes as high as 636 average megawatt hours during the fourth quarter.
However, Sonat Power Marketing's 1996 results were adversely impacted by
start-up costs.

                     ------------------------
Other Income Statement Items

<TABLE>
<CAPTION>
                                       (In Millions)
                                  -----------------------
Years Ended December 31,           1997     1996    1995
- ---------------------------------------------------------
<S>                               <C>      <C>     <C>   
Other Income (Loss), Net:
   Equity in earnings of
     unconsolidated affiliates    $ 43.0   $ 34.2  $ 46.3
   Sale of stock of subsidiary       -        -     188.0
   Minority interest                (4.4)    (4.9)   (0.9)
   Other income, net                 6.9      6.5   (44.6)
- ---------------------------------------------------------
                                  $ 45.5   $ 35.8  $188.8
=========================================================
</TABLE>

    1997 VERSUS 1996. The increase in equity in earnings of unconsolidated
affiliates is primarily due to improved results at Citrus (discussed earlier in
the Natural Gas Transmission section). Minority interest is AGL Resources' 35
percent share of earnings in Sonat Marketing and Sonat Power Marketing
(operating results were discussed earlier in the Energy Services section). Other
income, net increased in 1997 compared to 1996 primarily due to higher levels of
equity capitalized at Southern in its construction programs, offset slightly by
lower net gains ($2.4 million in 1997 as compared to $3.9 million in 1996) on
the termination of Southern's forward rate agreement (see Note 3 of the Notes to
Consolidated Financial Statements).

    1996 VERSUS 1995. The decrease in equity in earnings of unconsolidated
affiliates reflects the absence of earnings from the Company's investment in
Sonat Offshore Drilling Inc., the remaining interest of which was sold in July
1995, and a decrease in equity in earnings of Citrus (discussed earlier in the
Natural Gas Transmission section). The 1995 period includes the gain from the
Company's sale of its remaining interest in Sonat Offshore stock. (See Note 2 of
the Notes to Consolidated Financial Statements.) Other income, net increased in
the 1996 period primarily due to a $3.9 million net gain on partial termination
of a forward rate agreement, higher levels of equity capitalized at Southern,
and $41.7 million of net losses on the disposal of assets in 1995. In addition,
the 1995 period includes an $8.4 million loss on natural gas futures contracts
and $6.0 million of dividends.

<TABLE>
<CAPTION>
                                       (In Millions)
                                 ------------------------
Years Ended December 31,          1997     1996     1995
- ---------------------------------------------------------
<S>                              <C>      <C>      <C>   
Interest Expense, Net            $ 86.3   $ 82.8   $ 89.8
- ---------------------------------------------------------
</TABLE>

    1997 VERSUS 1996. Net interest expense increased in 1997 compared to 1996
due to higher average debt levels. The effect of lower interest rates on debt
and lower average regulatory reserve balances slightly offset the effect of
higher average debt levels. Interest capitalized decreased due to lower interest
capitalized at Sonat Exploration. 

    1996 VERSUS 1995. Net interest expense decreased in 1996 compared to 1995
due to lower average debt levels and lower average regulatory reserve balances
at Southern. The 1995 period included a $4.4 million favorable adjustment on
income tax related interest.

<TABLE>
<CAPTION>
                                       (In Millions)
                                 ------------------------
Years Ended December 31,          1997     1996     1995
- ---------------------------------------------------------
<S>                              <C>      <C>      <C>   
Income Tax Expense               $ 80.5   $ 93.1   $ 95.0
- ---------------------------------------------------------
</TABLE>

    1997 VERSUS 1996. Income tax expense decreased in 1997 compared to 1996 due
to lower pretax earnings.

                                       36

                                      II-9


<PAGE>   39
Sonat Inc. and Subsidiaries

    1996 VERSUS 1995. Excluding income taxes associated with the unusual items
in the 1995 period, primarily the gain on the sale of the Company's remaining
interest in Sonat Offshore stock (see earlier discussion and Note 2 of the Notes
to Consolidated Financial Statements), income taxes increased due to higher
pretax earnings and a decrease in tax preference items.

Liquidity and Capital Resources
Cash Flows
<TABLE>
<CAPTION>
                                       (In Millions)
                                 ------------------------
Years Ended December 31,          1997     1996     1995
- ---------------------------------------------------------
<S>                              <C>      <C>      <C>   
Operating Activities             $416.8   $500.6   $184.3
- ---------------------------------------------------------
</TABLE>

    1997 VERSUS 1996. Cash flow from operations decreased compared to the 1996
period due to the funding of a $116.0 million liability for transaction and
other costs in connection with the merger with Zilkha Energy (see Notes 1 and 15
of the Notes to Consolidated Financial Statements). Absent this item, cash flow
from operations improved compared to the 1996 period due to improved cash flows
at both Sonat Exploration and Southern. Partly offsetting the increase was a
decrease in Energy Services' cash flows due to the impact of higher energy
prices on working capital, including broker deposits.

    The 1996 period included $34.0 million in cash refunds paid to customers at
Southern. Other than those refunds, the change in GSR costs and the change in
reserves for regulatory matters were attributable to the recording of a customer
settlement by Southern in the second quarter of 1996 (the Customer Settlement).
Deferred income taxes and accrued income taxes reflect the impact of higher
deductions for intangible drilling costs at Sonat Exploration in 1997 and the
Customer Settlement in 1996. The asset impairment recorded by Sonat Exploration
during 1997 increased depreciation, depletion and amortization expense by $39.0
million and decreased deferred income taxes by $13.7 million. The change in
accounts receivable and accounts payable is primarily attributable to high
receivable and payable balances in December 1996 reflecting higher natural gas
prices as compared to 1995. The change in inventory primarily reflects the
purchase of material for Sonat Exploration's Cotton Valley Pinnacle Reef trend
drilling program and the purchase of natural gas inventory under an asset
management agreement at Sonat Marketing. 

    The change in Other, net is primarily due to $41.2 million of accrual 
reversals related to the Customer Settlement and a decrease in interruptible
transportation revenue credits of $13.5 million, both of which occurred in 1996.

    1996 Versus 1995. Cash flow from operations increased $316.3 million
compared with the 1995 period primarily due to improved operating results at
both Sonat Exploration and Sonat Marketing (discussed earlier in the operating
sections). At Southern, net GSR recoveries in 1996 compared to net GSR payments
in 1995 resulted in a $104.6 million improvement in cash flow from operations.

    Other than the net GSR recoveries/payments discussed above, both the change
in GSR costs and the change in reserves for regulatory matters were attributable
to recognition of the Customer Settlement in the second quarter of 1996. The
change in deferred income taxes reflects the deductibility of certain oil and
gas drilling costs in 1996 and the disposal of the Company's investment in Baker
Hughes preferred stock in the 1995 period. The growth in accounts receivable and
accounts payable is primarily attributable to higher natural gas prices and the
expanding business of Sonat Marketing. The change in accrued interest and income
taxes essentially reflects income tax deductions of GSR payments and tax refunds
in 1996 compared to income tax payments in 1995, including taxes on the Sonat
Offshore stock disposition. Inventories increased primarily due to gas inventory
purchases at Sonat Marketing and material purchases at Southern and Sonat
Exploration. The change in other current assets and other current liabilities is
primarily due to a decrease in gas imbalance receivables and payables, which
occurred in 1996.

    The change in Other, net is primarily due to $41.2 million of accrual
reversals related to the Customer

                                       37

                                     II-10


<PAGE>   40
Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)

Settlement and a decrease in interruptible transportation revenue credits of
$13.5 million in 1996, compared to $37.5 million from long-term gas sales
contract terminations and $13.5 million of deferred transition costs at Southern
in 1995. 

<TABLE>
<CAPTION>
                                     (In Millions)
                              ----------------------------
Years Ended December 31,        1997       1996     1995
- ----------------------------------------------------------
<S>                           <C>       <C>       <C>     
Investing Activities          $(712.2)  $(482.5)  $   92.3
- ----------------------------------------------------------
</TABLE>

    1997 VERSUS 1996. Net cash used in investing activities was $229.7 million
higher in 1997 compared to 1996, primarily due to higher capital expenditures
(see table below) resulting from increased developmental drilling at Sonat
Exploration. The increase in investments in unconsolidated affiliates primarily
reflects Southern's investment of $39.1 million in the Destin Pipeline joint
venture during 1997.

    1996 VERSUS 1995. Investing activities required $482.5 million of net cash
in 1996 compared to providing $92.3 million in 1995, which included sources of
cash from unusual items. In 1995, the Company received $326.0 million from the
sale of its remaining interest in Sonat Offshore stock, $167.0 million from the
sale of four million shares of Baker Hughes convertible preferred stock, and
$105.1 million in proceeds from the sale of Sonat Exploration oil and gas
properties. Capital expenditures (see table below) were higher in the 1996
period compared to the 1995 period primarily due to Southern's system expansion.

    Capital expenditures for the Company's business segments (excluding
exploratory costs and unconsolidated affiliates) were as follows:

<TABLE>
<CAPTION>
                                       (In Millions)
                                 -------------------------
Years Ended December 31,          1997     1996     1995
- ----------------------------------------------------------
<S>                              <C>      <C>      <C>    
Exploration and Production       $ 539.1  $ 368.4  $ 416.2
Natural Gas Transmission           144.2    130.4     62.7
Energy Services                     11.0      4.7      2.8
Other                                4.5      6.0      5.9
- ----------------------------------------------------------
   Total                         $ 698.8  $ 509.5  $ 487.6
==========================================================
</TABLE>


    The Company's share of capital expenditures by its unconsolidated affiliates
were as follows:

<TABLE>
<CAPTION>
                                       (In Millions)
                                  -----------------------
Years Ended December 31,           1997    1996     1995
- ---------------------------------------------------------
<S>                               <C>      <C>     <C>   
Exploration and Production        $  0.5   $  0.3  $  0.7
Natural Gas Transmission            41.8     15.1   100.5
Other                                0.2      0.5     0.5
- ---------------------------------------------------------
   Total                          $ 42.5   $ 15.9  $101.7
=========================================================
</TABLE>


<TABLE>
<CAPTION>
                                       (In Millions)
                                --------------------------
Years Ended December 31,         1997     1996      1995
- ----------------------------------------------------------
<S>                             <C>      <C>      <C>     
Financing Activities            $ 279.3  $(25.8)  $(248.5)
- ----------------------------------------------------------
</TABLE>


    1997 VERSUS 1996. Financing activities provided $279.3 million in 1997
compared to requiring $25.8 million in 1996. The change was primarily
attributable to increased borrowings, which helped finance higher capital
expenditures, the Company's stock repurchase program, and the funding of the
liability for transaction and other costs in connection with the merger with
Zilkha Energy (see Notes 1 and 15 of the Notes to Consolidated Financial
Statements) in 1997. In September 1997, Sonat and Southern each issued $100.0
million under their shelf registration statements.

    1996 VERSUS 1995. Net cash used in financing activities was $222.7 million
less in the 1996 period compared to the 1995 period. A portion of the proceeds
from the Sonat Offshore stock sale and the Baker Hughes stock sale were used to
repay borrowings under Sonat's floating rate facilities in the 1995 period.


Capital Resources

At December 31, 1997, the Company had bank lines of credit and a revolving
credit agreement with banks with a total capacity of $750.0 million. The
Company's bank and commercial paper borrowings in the aggregate are not
authorized to exceed the maximum amount available under its lines of credit and
revolving credit agreement. As a result, after giving effect to the $446.6
million of commercial paper and $130.0 million of borrowings from such banks
then outstanding, $173.4 million was available to the Company under such lines
of credit and revolving credit agreement at December 31, 1997.

                                     38

                                     II-11


<PAGE>   41
Sonat Inc. and Subsidiaries

    At December 31, 1997, Sonat had a shelf registration with the Securities
and Exchange Commission that provided for issuance of up to $500.0 million in
debt securities of which $300.0 million had been issued. The remaining $200.0
million has subsequently been issued (see Note 15 of the Notes to Consolidated
Financial Statements). It is likely that new shelf registrations for both Sonat
and Southern will be filed in 1998. 

    Sonat also completed a new 364-day $700.0 million revolving credit facility
with 20 banks in late January 1998. In connection with this new credit facility
the Company terminated existing lines of credit providing for up to $200.0
million of borrowings. 

    The Company's capital expenditures and other investing requirements for
1998 are budgeted to aggregate $842 million. This amount reflects investments in
unconsolidated affiliates and proposed expenditures for oil and gas property
acquisitions, exploration and development (including amounts relating to the
Company's subsidiary that merged with Zilkha Energy), pipeline expansion and
other projects. The Company completed the Zilkha Energy merger on January 30,
1998, issuing $1.04 billion of common stock to the Zilkha Energy shareholders
(see Note 15 of the Notes to Consolidated Financial Statements). The Company's
cash requirements relating to the Zilkha Energy merger totaled approximately
$290 million, principally for repayment of debt and certain other liabilities of
Zilkha and transaction expenses. 

    The Company's Board of Directors has extended its stock repurchase program
to December 31, 1998, and authorized the purchase of an additional one million
shares. Shares purchased under the program are expected to be reissued in
connection with employee stock option and restricted stock programs. 

    The Company believes that cash flow from operations and borrowings in
either the private or public market will provide the Company with the means to
fund operations and currently planned investment and capital expenditures.


MARKET RISK

Financial instruments of the Company expose it to both commodity price risk and
interest rate risk.

    Commodity Price Risk - The Company's primary market risk exposure is the
volatility of spot-market energy commodity prices, relating to the portfolio
position of its financial instruments and physical commitments, which can affect
the operating results of Sonat Exploration and Sonat Energy Services. The
Company uses commodity futures contracts, options and price swap agreements to
hedge its commodity price risk on crude oil, natural gas and electricity. Sonat
Energy Services performs all hedging activity (non-trading) for both its own
operations and for the operations of Sonat Exploration. In June 1997, Sonat
Energy Services, through its subsidiary, Sonat Marketing, also began using
derivative instruments as a market maker (trading activity) by maintaining
active trading positions in natural gas futures and swap contracts and limiting
its risk to changes in the value of its outstanding positions through the use of
Value-at-Risk models, establishment of offsetting positions, and limit and
monitoring procedures.

    The Company's non-trading (hedging) and trading activities are implemented
under a set of policies approved by the Board of Directors. In addition, all
derivative activities are internally reviewed by a Risk Oversight Committee to
ensure compliance with all policies. The Company's use of derivative instruments
to reduce the effect of market volatility is described in Note 3 of the Notes to
Consolidated Financial Statements.

    Sonat Energy Services manages its commodity price risks through its
subsidiaries, Sonat Marketing Company and Sonat Power Marketing. Sonat Marketing
and Sonat Power Marketing each manage commodity risks at a portfolio level by
utilizing Value-at-Risk models for natural gas and electricity commodities,
respectively. Each Value-at-Risk model includes energy commodity transactions,
both physical and derivative (commodity futures, swaps and options) for both
trading and non-trading activities. The Value-at-Risk models use historical or
variance co-variance simulation methods to determine commodity risk exposure
(the loss that could

                                       39

                                     II-12


<PAGE>   42
Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)

occur over a two-day period) due to changes in natural gas or electricity
commodity prices within a 95 percent confidence level. Value-at-Risk models are
routinely backtested against market prices and volatilities to assess the
quality of Value-at-Risk measures. 

    The Value-at-Risk data for Sonat Marketing for 1997 is as follows:

<TABLE>
<CAPTION>
                                  (In Thousands)
                        -------------------------------
                         Average    Maximum     Minimum
- -------------------------------------------------------
<S>                       <C>         <C>          <C> 
Trading Activities
   (Commencing
   June 1, 1997)          $ 593       $ 752        $473
=======================================================
</TABLE>

    The Value-at-Risk for non-trading activities of Sonat Energy Services is
immaterial for both Sonat Marketing and Sonat Power Marketing. 

    The Risk Oversight Committee and management monitor the portfolio
Value-at-Risk frequently to ensure compliance with Board limits.

    Interest Rate Risk - The Company's entire portfolio of interest rate risk
instruments is classified as non-trading. The Company's interest income and
expense are sensitive to changes in the level of short-term interest rates in
the United States. In general, the Company uses excess funds to reduce
short-term debt levels and therefore has minimal cash equivalent investments.
Short-term debt averaged $216.6 million in 1997. Excess cash generated by or
contributed to joint venture projects is invested on a short-term basis pending
distribution or expenditure on capital projects. Such short-term investments
averaged $14.0 million in 1997. To mitigate the impact of fluctuations in
interest rates, the Company maintains a balance among components of its capital
structure, providing a mix of maturities and pricing methods for its debt
obligations. At December 31, 1997, 36 percent of the Company's debt (including
its interest in joint venture debt) had variable rates. In the past the Company
has used derivative instruments to aid in its management of interest rate risk,
although it is not currently doing so.

    The following table provides information about the Company's financial
instruments that are sensitive to changes in interest rates. The table presents
principal cash flows and related weighted-average interest rates by expected
maturity dates. The weighted-average variable rate is the current effective
rate. Municipal bonds are used to satisfy obligations under various
non-qualified benefit plans of the Company. Broker deposits of $27.7 million
with an average return of 4.9 percent at December 31, 1997, were excluded from
the table.

                                       40

                                     II-13



<PAGE>   43


Interest Rate Risk Instruments
Principal Amount by Expected Maturity and Average Interest Rate

<TABLE>
<CAPTION>
                                                                      (Dollars In Millions)
                                        ----------------------------------------------------------------------------------
                                                                                                                Fair Value
                                        1998      1999       2000       2001       2002    Thereafter    Total   12/31/97
- --------------------------------------------------------------------------------------------------------------------------
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>   
Assets:
   Restricted Cash Deposits           $ 116.0    $   -      $   -      $   -      $   -      $   -      $ 116.0    $116.0
   Average Interest Rate                  5.6%

   Municipal Bonds                    $   1.0    $   3.0    $   4.2    $   4.2    $   2.8    $  33.5    $  48.7    $ 46.9
   Average Interest Rate                  5.0%       5.0%       4.9%       4.8%       4.8%       4.9%

Liabilities:
   Commercial Paper                   $ 446.6    $   -      $   -      $   -      $   -      $   -      $ 446.6    $446.6
   Average Interest Rate                  6.3%

   Long-term Debt, including
     Current Portion:
       Fixed Rate                     $  11.0    $ 109.4    $   3.1    $ 200.2    $ 200.0    $ 400.0    $ 923.7    $966.4
       Average Interest Rate              7.9%       7.8%       7.7%       7.4%       7.0%       6.8%

       Variable Rate                  $   -      $   -      $   -      $ 130.0    $   -      $   -      $ 130.0    $130.0
       Average Interest Rate (1)
==========================================================================================================================
</TABLE>

(1) Rate to be paid is based on LIBOR plus 20 basis points. At December 31,
    1997, this rate was 6.14 percent.


INFLATION AND THE EFFECT OF CHANGING ENERGY PRICES

The rate of inflation in the United States has been moderate over the past
several years and has not significantly affected the profitability of the
Company. In prior periods of high general inflation, oil and gas prices
generally increased at comparable rates; however, there is no assurance that
this will be the case in the current environment or in possible future periods
of high inflation. In addition, Sonat Exploration has experienced increasing
dayrates for drilling rigs. Margins in the Energy Services segment are highly
sensitive to competitive pressures and may not reflect the effects of inflation.
The results of operations in the Company's three major business segments will be
affected by future changes in oil and gas prices and the interrelationship
between oil, gas and other energy prices.


ENVIRONMENTAL ISSUES

The operations and properties of Sonat Exploration, Southern, and their
subsidiaries are subject to extensive and changing federal, state, and local
laws and regulations relating to environmental protection, including
the generation, storage, handling, emission, transportation, and discharge of
materials into the environment, and relating to safety and health. The recent
trend in environmental legislation and regulation generally is toward stricter
standards, and this trend will likely continue. These laws and regulations may
require the acquisition of a permit or other authorization before construction
or drilling commences and for certain other activities, limit or prohibit
construction, drilling, and other activities on certain lands lying within
wilderness or wetlands and other protected areas and impose substantial
liabilities for pollution resulting from operations. The permits required for
various operations are subject to revocation, modification, and renewal by
issuing authorities. The Company believes that its operations currently are in
substantial compliance with applicable environmental regulations.

    Governmental authorities have the power to enforce compliance with their
regulations, and violations are subject to fines or injunction, or both. The
Company does not expect environmental compliance matters to have a material
adverse effect on its financial position or

                                       41

                                     II-14


<PAGE>   44
Management's Discussion and Analysis of Financial Condition and Results of
Operations (continued)

results of operations. It is also not anticipated that the Company will be
required in the near future to expend amounts that are material to its financial
condition or operations by reason of environmental laws and regulations, but
because such laws and regulations are frequently changed, and may impose
increasingly stricter requirements, the Company is unable to predict the
ultimate cost of complying with such laws and regulations.

    Southern has been notified that it is or may be a potentially responsible
party (PRP) under the Comprehensive Environmental Response, Compensation and
Liability Act (CERCLA) in connection with three Superfund sites for which the
amount of its liability has not been settled. In these cases, the Company has
determined that the aggregate maximum amount of loss reasonably likely to be
attributed to it, after giving effect to likely contributions by other PRPs,
would not be material to its financial position or results of operations.
However, liability for PRPs under CERCLA (and applicable state law) is joint and
several among all PRPs. Although volumetric allocation is a factor in assessing
liability, it is not necessarily determinative; thus, the ultimate liability at
any of these sites could be substantially greater than the maximum amounts
estimated by the Company.

    In the operation of their natural gas pipeline systems, Southern and its
wholly owned subsidiaries, South Georgia Natural Gas Company and Sea Robin
Pipeline Company, have used, and continue to use at several locations, gas
meters containing elemental mercury. Southern, South Georgia and Sea Robin plan
to remove all remaining mercury meters during the course of regularly scheduled
facilities upgrades. Mercury and mercury meters are handled pursuant to
procedures that are designed to protect employees and the environment and to
comply with Occupational Safety and Health Administration standards. It is
generally believed in the natural gas pipeline industry that, in the course of
normal maintenance and replacement operations, elemental mercury may have been
released from mercury meters. Southern has determined that its pipeline meters
may in the past have been the source of small releases of elemental mercury. As
a result, Southern undertook the characterization of 658 sites across the
pipeline systems of Southern and Sea Robin during 1995, 1996, and 1997.
Approximately 63 percent of the sites characterized had detectable levels of
mercury. Characterization of potential sites on the pipeline system of South
Georgia has not commenced at this time. Southern will file copies of the
characterization reports with the applicable state agencies upon their
finalization. At this time, only the State of Georgia has issued formal
guidelines for remediation of mercury sites, although the State of Louisiana has
issued informal guidance. Southern is unable to estimate the cost of mercury
remediation because costs will vary based on a number of factors particular to
each site and because regulatory guidance is still uncertain for all sites.
Based on its experience with other remediation projects, industry experience to
date with remediation of mercury, and its characterization data, Southern
believes that the cost of its characterization and remediation of any mercury
contamination will not be material to its financial position or results of
operations.

    The Company generally considers environmental assessment and remediation
costs and costs associated with compliance with environmental standards incurred
by Southern, South Georgia, and Sea Robin to be recoverable through rates since
they are prudent costs incurred in the ordinary course of business and,
accordingly, generally will seek recovery of such costs through rate filings,
although no assurance can be given with regard to their ultimate recovery.


RECENT ACCOUNTING PRONOUNCEMENTS

In June 1997, the Financial Accounting Standards Board (FASB) issued SFAS No.
130, Reporting Comprehensive Income, which established standards for reporting
and display of comprehensive income and its components. The components of
comprehensive income refer to revenues, expenses, gains and losses that are
excluded from net income under current accounting standards, including
unrecognized foreign currency translation items, minimum pension liability
adjustments and unrealized gains and losses on certain investments in debt and
equity securities. SFAS No. 130 requires that all items

                                       42

                                     II-15
<PAGE>   45
Sonat Inc. and Subsidiaries

that are recognized under accounting standards as components of comprehensive
income be reported in a financial statement displayed in equal prominence with
other financial statements; the total of other comprehensive income for a period
is required to be transferred to a component of equity that is separately
displayed in a statement of financial position at the end of an accounting
period. At December 31, 1997, Other Capital in the Consolidated Balance Sheet
includes $1.5 million related to components of other comprehensive income. SFAS
No. 130 is effective for both interim and annual periods beginning after
December 15, 1997.

    In June 1997, the FASB issued SFAS No. 131, Disclosures about Segments of an
Enterprise and Related Information. SFAS No. 131 establishes standards for the
way public enterprises are to report information about operating segments in
annual financial statements and requires the reporting of selected information
about operating segments in interim financial reports issued to shareholders.
SFAS No. 131 also establishes standards for related disclosures about products
and services, geographic areas, and major customers. The Company previously
modified its definition of segments to conform to the approach required by SFAS
No. 131, which is effective for periods beginning after December 15, 1997.

YEAR 2000 PROJECT

The Company is aware of the potential impact the Year 2000 could have on its
information technology and business infrastructure. To answer the Year 2000
challenge, the Sonat Board of Directors directed that a corporate-wide
initiative be undertaken and that the project be completed by December 31, 1998.
A consulting firm was engaged to assist in this effort.

    The assessment phase of the Year 2000 project was completed in December
1997. This phase included a comprehensive inventory and review of existing
applications, processes and systems to identify areas which might be affected.
The project plan includes steps to implement the required modifications
identified during the assessment phase and test systems for compliance.
Estimated cost of the Year 2000 project for capital, as well as general and
administrative costs, are expected to be $5 million to $10 million.

    Over the past few years the Company has made technology investments that
greatly reduced the current economic impact of Year 2000, including the
replacement of mainframe systems with Year 2000 compliant vendor packages on new
client/server platforms. The current goal is that by mid-1998 all major
applications will be vendor packages that are Year 2000 compliant.

CAUTIONARY STATEMENT CONCERNING
FORWARD-LOOKING STATEMENTS

This Annual Report contains forward-looking statements regarding the Company's
business plans and prospects, objectives, future drilling plans, expansion
projects, proposed capital expenditures and expected performance or results.
These forward-looking statements are based on assumptions that the Company
believes are reasonable, but are subject to a wide range of risks and
uncertainties and, as a result, actual results may differ materially from those
expressed in such forward-looking statements. Important factors that could cause
actual results to differ include changes in oil and gas prices and underlying
demand, which would affect profitability and might cause the Company to alter
its plans; the timing and success of the Company's exploration and development
drilling programs, which would affect production levels and reserves; the
results of the Company's hedging activities; risks incident to the drilling and
operation of oil and gas wells; future drilling, production and development
costs and the success of the Company's internal cost reduction activities; and
the requirements to receive various governmental approvals to proceed with
expansion projects at Southern. Realization of the Company's objectives and
expected performance can also be adversely affected by the actions of customers
and competitors, changes in governmental regulation of the Company's businesses,
and changes in general economic conditions and the state of domestic capital
markets.

                                       43

                                     II-16
<PAGE>   46

Sonat Inc. and Subsidiaries

REPORT OF MANAGEMENT

Management of the Company is responsible for the preparation and integrity of
all financial data included in this annual report. The Consolidated Financial
Statements have been prepared in conformity with generally accepted accounting
principles and necessarily include amounts based on estimates and judgments of
management.

    The Company's accounting systems include controls designed to provide
reasonable assurance that assets are safeguarded against loss or unauthorized
use and that the financial records are adequate and reliable for preparation of
financial statements and other financial data. The concept of reasonable
assurance is based on the recognition that the cost of internal controls should
not exceed the related benefits. An integral part of the internal controls is
the selection, training and development of qualified accounting and internal
audit personnel.

    The Company engages the firm of Ernst & Young LLP as independent auditors to
audit the Company's Consolidated Financial Statements and express their opinion
thereon. Their audit is conducted in accordance with generally accepted auditing
standards and includes a review and evaluation of the Company's internal
controls and other procedures as they consider appropriate. The Report of Ernst
& Young LLP, Independent Auditors, appears on the facing page. Internal audit
activities are coordinated with the independent auditors to maximize audit
effectiveness.

    The Audit Committee of the Board of Directors is composed solely of
directors who are not active or retired officers or employees of the Company. It
recommends a firm to serve as independent auditors of the Company, subject to
nomination by the Board of Directors and election by the stockholders, approves
all audit and other professional services rendered by the independent auditors
and regularly reviews their independence. The Audit Committee reviews and
reports on significant accounting decisions and transactions and the scope and
results of audits by the Company's internal auditing staff and the independent
auditors. It reviews with management compliance with the Company's business
ethics and conflict of interest policies and reviews with independent auditors
the adequacy of the Company's internal controls. The internal auditors and the
independent auditors have free access to the Audit Committee, without
management's presence, to discuss the Company's internal controls and the
results of their audits.

/s/James E. Moylan, Jr.

James E. Moylan, Jr.
Senior Vice President and Chief Financial Officer
February 26, 1998

                                       44

                                     II-17
<PAGE>   47

Sonat Inc. and Subsidiaries

REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders
Sonat Inc.

We have audited the accompanying consolidated balance sheets of Sonat Inc. and
Subsidiaries as of December 31, 1997 and 1996, and the related consolidated
statements of income, changes in stockholders' equity and cash flows for each of
the three years in the period ended December 31, 1997. These financial
statements are the responsibility of the Company'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 consolidated financial position of Sonat Inc. and
Subsidiaries at December 31, 1997 and 1996, and the consolidated results of
their operations and their cash flows for each of the three years in the period
ended December 31, 1997, in conformity with generally accepted accounting
principles.

/s/ Ernst and Young LLP

Birmingham, Alabama
January 16, 1998,
    except for Note 15,
    as to which the date
    is January 30, 1998

                                       45

                                     II-18
<PAGE>   48

CONSOLIDATED BALANCE SHEETS
Sonat Inc. and Subsidiaries                    Consolidated Financial Statements

<TABLE>
<CAPTION>

                                                                              (In Thousands)
                                                                         -----------------------
December 31,                                                                 1997        1996
- ------------------------------------------------------------------------------------------------
<S>                                                                      <C>          <C>

ASSETS
Current Assets:
   Cash and cash equivalents                                             $   13,512   $   29,639
   Restricted cash (Notes 1 and 15)                                         115,956           --
   Accounts receivable                                                      594,972      577,021
   Inventories (Note 4)                                                      61,706       30,500
   Gas imbalance receivables                                                 16,644       21,694
   Assets from price risk management activities (Note 3)                     92,150           --
   Other                                                                     42,785       34,436
- ------------------------------------------------------------------------------------------------
     Total Current Assets                                                   937,725      693,290
- ------------------------------------------------------------------------------------------------


Investments and Advances:
   Unconsolidated affiliates (Note 5)                                       491,681      414,560
   Other investments (Note 3)                                                56,608       50,561
- ------------------------------------------------------------------------------------------------
                                                                            548,289      465,121
- ------------------------------------------------------------------------------------------------


Plant, Property and Equipment, successful efforts method of accounting
   used for oil and gas properties (Notes 6 and 13)                       5,597,864    5,084,283
Less Accumulated Depreciation, Depletion and Amortization                 2,859,649    2,650,419
- ------------------------------------------------------------------------------------------------
                                                                          2,738,215    2,433,864
- ------------------------------------------------------------------------------------------------



Deferred Charges and Other:
   Assets from price risk management activities (Note 3)                     27,686           --
   Other                                                                    179,599      182,384
- ------------------------------------------------------------------------------------------------
                                                                            207,285      182,384
- ------------------------------------------------------------------------------------------------
Total Assets                                                             $4,431,514   $3,774,659
================================================================================================
</TABLE>

See accompanying notes.

                                       46

                                     II-19
<PAGE>   49

CONSOLIDATED BALANCE SHEETS
Sonat Inc. and Subsidiaries                    Consolidated Financial Statements

<TABLE>
<CAPTION>

                                                                              (In Thousands)
                                                                         -----------------------
December 31,                                                                1997         1996
- ------------------------------------------------------------------------------------------------
<S>                                                                      <C>          <C>
LIABILITIES AND STOCKHOLDERS' EQUITY

Current Liabilities:
   Long-term debt due within one year (Note 7)                           $   11,008   $   53,707
   Unsecured notes (Note 7)                                                 446,721      158,030
   Accounts payable                                                         570,041      510,130
   Accrued income taxes                                                      18,274       26,726
   Accrued interest                                                          34,469       28,584
   Gas imbalance payables                                                    13,688       20,290
   Liabilities from price risk management activities (Note 3)               103,446           --
   Other                                                                     52,442       51,370
- ------------------------------------------------------------------------------------------------
     Total Current Liabilities                                            1,250,089      848,837
- ------------------------------------------------------------------------------------------------

Long-Term Debt (Note 7)                                                   1,042,734      872,255
- ------------------------------------------------------------------------------------------------

Deferred Credits and Other:
   Deferred income taxes (Note 8)                                           344,599      284,564
   Reserves for regulatory matters (Note 9)                                   4,432       14,644
   Liabilities from price risk management activities (Note 3)                 5,014           --
   Other                                                                    149,226      169,995
- ------------------------------------------------------------------------------------------------
                                                                            503,271      469,203
- ------------------------------------------------------------------------------------------------

Commitments and Contingencies (Note 9)

Stockholders' Equity:
   Common stock, $1.00 par; 400,000,000 shares authorized, 87,227,478 and
     87,232,573 shares issued in 1997 and 1996, respectively (Notes
     10 and 15)                                                              87,227       87,233
   Other capital                                                             34,747       31,648
   Retained earnings                                                      1,578,327    1,495,186
- ------------------------------------------------------------------------------------------------
                                                                          1,700,301    1,614,067

   Less treasury stock at cost, 1,438,793 and 830,908 shares in 1997
     and 1996, respectively (Note 10)                                       (64,881)     (29,703)
- ------------------------------------------------------------------------------------------------
     Total Stockholders' Equity                                           1,635,420    1,584,364
- ------------------------------------------------------------------------------------------------
Total Liabilities and Stockholders' Equity                               $4,431,514   $3,774,659
================================================================================================
</TABLE>

See accompanying notes.

                                       47

                                     II-20
<PAGE>   50

CONSOLIDATED STATEMENTS OF INCOME
Sonat Inc. and Subsidiaries                    Consolidated Financial Statements

<TABLE>
<CAPTION>

                                                               (In Thousands, Except Per-Share Amounts)
                                                              -----------------------------------------
Years Ended December 31,                                          1997           1996          1995
- -------------------------------------------------------------------------------------------------------
<S>                                                           <C>            <C>            <C>
Revenues (Note 12)                                            $ 4,174,624    $ 3,039,014    $ 1,754,341
- -------------------------------------------------------------------------------------------------------
Costs and Expenses:
   Natural gas cost                                             2,949,766      1,973,147        912,966
   Electric power cost                                            224,294         65,699             88
   Operating and maintenance                                      181,111        163,737        171,885
   General and administrative                                     152,438        159,515        140,511
   Depreciation, depletion and amortization                       326,014        288,192        298,714
   Taxes, other than income                                        43,800         47,447         41,244
- -------------------------------------------------------------------------------------------------------
                                                                3,877,423      2,697,737      1,565,408
- -------------------------------------------------------------------------------------------------------
Operating Income                                                  297,201        341,277        188,933
- -------------------------------------------------------------------------------------------------------
Other Income (Loss), Net:
   Equity in earnings of unconsolidated affiliates (Note 5)        43,020         34,211         46,258
   Sale of stock of subsidiary (Note 2)                                --             --        188,012
   Minority interest                                               (4,394)        (4,907)          (888)
   Other income, net                                                6,905          6,516        (44,590)
- -------------------------------------------------------------------------------------------------------
                                                                   45,531         35,820        188,792
- -------------------------------------------------------------------------------------------------------
Interest:
   Interest income                                                  3,681          4,153          6,413
   Interest expense                                               (93,733)       (92,040)      (102,797)
   Interest capitalized                                             3,777          5,094          6,540
- -------------------------------------------------------------------------------------------------------
                                                                  (86,275)       (82,793)       (89,844)
- -------------------------------------------------------------------------------------------------------
Income Before Income Taxes                                        256,457        294,304        287,881
Income Tax Expense (Note 8)                                        80,537         93,115         94,993
- -------------------------------------------------------------------------------------------------------
     Net Income                                               $   175,920    $   201,189    $   192,888
=======================================================================================================
Earnings Per Share of Common Stock (Note 10)                  $      2.05    $      2.33    $      2.24
Earnings Per Share of Common Stock -
   Assuming Dilution (Note 10)                                $      2.01    $      2.30    $      2.21
=======================================================================================================
Weighted Average Shares Outstanding                                85,941         86,211         86,270
Weighted Average Shares Outstanding - Assuming Dilution            87,511         87,564         87,102
=======================================================================================================
Dividends Paid Per Share (Note 10)                            $      1.08    $      1.08    $      1.08
=======================================================================================================
</TABLE>

See accompanying notes.

                                       48

                                     II-21
<PAGE>   51

Consolidated Statements of Changes in Stockholders' Equity
Sonat Inc. and Subsidiaries                    Consolidated Financial Statements

<TABLE>
<CAPTION>

                                                                          (In Thousands)
                                           -------------------------------------------------------------------------
                                                     1997                       1996                     1995
Years Ended December 31,                      SHARES       AMOUNT        Shares       Amount       Shares     Amount
- --------------------------------------------------------------------------------------------------------------------
<S>                                        <C>       <C>             <C>       <C>             <C>       <C>
Common Stock, $1.00 Par; 400,000,000
   Shares Authorized (Note 10):
   Balance at beginning of year            87,233    $    87,233     87,244    $    87,244     87,252    $    87,252
   Canceled                                    (6)            (6)       (11)           (11)        (8)            (8)
- --------------------------------------------------------------------------------------------------------------------
     Balance at end of year                87,227         87,227     87,233         87,233     87,244         87,244
- --------------------------------------------------------------------------------------------------------------------
Other Capital:
   Balance at beginning of year                           31,648                    39,795                    42,311
   Benefit plans transactions and other                    3,099                    (8,147)                   (2,516)
- --------------------------------------------------------------------------------------------------------------------
     Balance at end of year                               34,747                    31,648                    39,795
- --------------------------------------------------------------------------------------------------------------------
Retained Earnings:
   Balance at beginning of year                        1,495,186                 1,387,137                 1,287,339
   Net income                                            175,920                   201,189                   192,888
   Cash dividends at $1.08 per share                     (92,779)                  (93,140)                  (93,090)
- --------------------------------------------------------------------------------------------------------------------
     Balance at end of year                            1,578,327                 1,495,186                 1,387,137
- --------------------------------------------------------------------------------------------------------------------
Treasury Stock, at cost:
   Balance at beginning of year              (831)       (29,703)    (1,077)       (31,534)      (871)       (25,016)
   Purchased                               (1,058)       (53,176)      (774)       (30,914)      (645)       (19,230)
   Issued                                     451         17,998      1,020         32,745        439         12,712
- --------------------------------------------------------------------------------------------------------------------
     Balance at end of year                (1,438)       (64,881)      (831)       (29,703)    (1,077)       (31,534)
- --------------------------------------------------------------------------------------------------------------------
Total Stockholders' Equity                 85,789    $ 1,635,420     86,402    $ 1,584,364     86,167    $ 1,482,642
====================================================================================================================
</TABLE>

See accompanying notes.

                                       49

                                     II-22
<PAGE>   52


CONSOLIDATED STATEMENTS OF CASH FLOWS
Sonat Inc. and Subsidiaries                    Consolidated Financial Statements

<TABLE>
<CAPTION>

                                                                                   (In Thousands)
                                                                      ----------------------------------------
Years Ended December 31,                                                    1997         1996         1995
- --------------------------------------------------------------------------------------------------------------
<S>                                                                    <C>            <C>          <C>
Cash Flows from Operating Activities:
   Net income                                                          $   175,920    $ 201,189    $   192,888
   Adjustments to reconcile net income to net
     cash provided by operating activities:
       Depreciation, depletion and amortization                            326,014      288,192        298,714
       Deferred income taxes                                                60,035       71,442         25,165
       Equity in earnings of unconsolidated
         affiliates, less distributions                                    (31,914)     (23,040)       (34,265)
       Gain on sale of stock of subsidiary and
         net gain on disposal of assets                                     (4,109)      (3,377)      (144,969)
       Reserves for regulatory matters                                     (10,212)    (167,154)        (1,545)
       Gas supply realignment costs                                          7,514      187,929        (80,553)
       Change in:
         Accounts receivable                                               (17,951)    (250,548)       (77,591)
         Inventories                                                       (31,206)      (6,544)         2,766
         Accounts payable                                                   59,911      212,470         85,516
         Accrued interest and income taxes, net                             (2,389)      28,490        (29,379)
         Other current assets                                               (3,477)      (4,562)         5,329
         Other current liabilities                                          (5,530)       4,567        (16,508)
       Net change from price risk management activities                    (11,376)        --             --
       Net change in restricted cash                                      (115,956)        --             --
       Other, net                                                           21,549      (38,456)       (41,234)
- --------------------------------------------------------------------------------------------------------------
           Net cash provided by operating activities                       416,823      500,598        184,334
- --------------------------------------------------------------------------------------------------------------
Cash Flows from Investing Activities:
   Plant, property and equipment additions                                (698,818)    (509,534)      (487,564)
   Net proceeds from sale of subsidiary stock and disposal of assets        45,965       49,256        592,838
   Investments in unconsolidated affiliates and other                      (59,366)     (22,209)       (12,959)
- --------------------------------------------------------------------------------------------------------------
           Net cash provided by (used in) investing activities            (712,219)    (482,487)        92,315
- --------------------------------------------------------------------------------------------------------------
Cash Flows from Financing Activities:
   Proceeds from issuance of long-term debt                              1,935,041      855,776      3,103,000
   Payments of long-term debt                                           (1,808,023)    (718,877)    (3,296,565)
   Changes in short-term borrowings                                        288,691      (60,870)        18,900
- --------------------------------------------------------------------------------------------------------------
     Net changes in debt                                                   415,709       76,029       (174,665)
   Dividends paid                                                          (92,779)     (93,140)       (93,090)
   Treasury stock purchases                                                (53,176)     (30,914)       (19,230)
   Other                                                                     9,515       22,264         38,494
- --------------------------------------------------------------------------------------------------------------
           Net cash provided by (used in) financing activities             279,269      (25,761)      (248,491)
- --------------------------------------------------------------------------------------------------------------
Net Increase (Decrease) in Cash and Cash Equivalents                       (16,127)      (7,650)        28,158
Cash and Cash Equivalents at Beginning of Year                              29,639       37,289          9,131
- --------------------------------------------------------------------------------------------------------------
Cash and Cash Equivalents at End of Year                               $    13,512    $  29,639    $    37,289
==============================================================================================================
Supplemental Disclosures of Cash Flow Information
Cash Paid For:
   Interest (net of amount capitalized)                                $    83,726    $  68,670    $    81,900
   Income taxes, net                                                        20,124       (5,694)        96,455
==============================================================================================================
</TABLE>

See accompanying notes.

                                       50

                                     II-23
<PAGE>   53

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
Sonat Inc. and Subsidiaries

1    BUSINESS DESCRIPTION AND
     SIGNIFICANT ACCOUNTING POLICIES

Business Description - The Consolidated Financial Statements of Sonat Inc.
(Sonat) and its subsidiaries (the Company) reflect operations in the Exploration
and Production, Natural Gas Transmission and Energy Services segments. The
Exploration and Production segment is engaged in exploration, development and
production of domestic oil and natural gas. The Natural Gas Transmission
segment is primarily engaged in the interstate transmission of natural gas. The
Energy Services segment is primarily engaged in the marketing of natural gas and
electric power. For further description of business segments, see Note 12. For a
description of financial instruments, credit risk and contingencies, see Notes 3
and 9.

    Principles of Consolidation - The Consolidated Financial Statements include
the accounts of Sonat and its subsidiaries. Intercompany transactions and
accounts have been eliminated in consolidation. The equity method of accounting
is used for investments in affiliates owned 50 percent or less.

    The 1996 and 1995 periods have been restated to reflect the reclassification
of natural gas sales, natural gas cost and transition cost recovery to other
revenues to conform with the 1997 presentation. Certain other amounts in the
1996 and 1995 Consolidated Financial Statements and Notes have also been
reclassified to conform with the 1997 presentation.

    Use of Estimates in the Preparation of Financial Statements - In preparing
financial statements in conformity with generally accepted accounting
principles, management is required to make estimates and assumptions that affect
the reported amounts of assets and liabilities and the disclosure of contingent
assets and liabilities at the date of the financial statements and revenues and
expenses during the reporting period. Actual results could differ from those
estimates.

    Cash Equivalents - Cash equivalents are typically money-market investments
in the form of repurchase agreements, certificates of deposit and time deposits
with maturities of three months or less at the time of purchase. These
investments are accounted for at cost.

    Restricted Cash - As of December 31, 1997, the Company has $116.0 million of
restricted cash. The restricted cash is held in trust by the issuing bank, is
restricted as to withdrawal and use, and is invested in cash equivalents. The
restricted cash usage is limited to the payment of certain expenses related to
the merger with Zilkha Energy Company (see Note 15).

    Inventories - At December 31, 1997, inventories consist primarily of
materials and supplies and gas stored underground, which is carried at average
cost.

    Gas Imbalance Receivables and Payables - Gas imbalances represent the
difference between gas receipts from and gas deliveries to the Company's
transportation and storage customers. Gas imbalances arise when these customers
deliver more or less gas into the pipeline than they take out. Imbalances
incurred prior to implementation of Order No. 636 are settled through exchange
of gas. Imbalances incurred after implementation of Order No. 636 are settled
monthly.

    Plant, Property and Equipment and Depreciation - Plant, property and
equipment is carried at cost. The Company provides for depreciation on a
composite or straight-line basis, except for oil and gas properties. (See Notes
6 and 13.)

    Revenue Recognition - Revenue is recognized in the Exploration and
Production segment when deliveries of oil and natural gas are made. The
Company's Natural Gas Transmission segment recognizes revenue from natural gas
transportation in the period the service is provided. Reserves are provided on
revenues collected subject to refund when appropriate. Revenues are recognized
in the Energy Services segment in either the period a transaction is consummated
(for items in the mark-to-market portfolio) or in the period the physical
commodity is delivered.

    Commodity Price-Risk Management Activities - Through May 1997, the Company
used derivative instruments (commodity futures contracts, options and price swap
agreements) solely to hedge its commodity price risk on natural gas, crude oil
and electricity. In June 1997, the Company also began using derivative
instruments as a market maker (trading activity) in natural gas.

                                       51

                                     II-24
<PAGE>   54




Notes to Consolidated Financial Statements

NOTE 1 (CONTINUED)

    Natural gas, crude oil and electricity futures contracts are traded on the
New York Mercantile Exchange (NYMEX). Natural gas contracts are for fixed units
of 10,000 MMBtu and are available for up to 36 months in the future. Crude oil
contracts are for fixed units of 1,000 barrels and are available for up to 34
months in the future. Electricity contracts are for 736 megawatt hours and are
available for up to 18 months in the future.

    Price swap agreements call for one party to make monthly payments to (or
receive payments from) another party based upon the differential between a fixed
and a variable price (fixed-price swap) or two variable prices (basis swap) for
a notional volume specified by the contract.

    Options can be exchange traded on the NYMEX or traded over the counter.
Exchange traded options give the owner the right, but not the obligation, to a
futures contract. Over-the-counter options give the owner the right, but not the
obligation, to buy or sell an underlying commodity at a given price. At December
31, 1997, the Company had only over-the-counter options.

    Non-Trading Activities - Derivative positions taken specifically to mitigate
market price risk associated with significant physical transactions are
accounted for using hedge accounting provided they meet hedge accounting
criteria. Under hedge accounting, gains and losses from futures are deferred in
the Consolidated Balance Sheets in Other Deferred Credits and recognized in
earnings in conjunction with the earnings recognition of the underlying
physical. Each net payment/receipt due or owed under the swap agreement is
recognized in earnings during the period to which the payment/receipt relates,
and there is no recognition in the Consolidated Balance Sheets for changes in
the swap's fair value.

    The derivative instruments used to hedge commodity transactions have
historically had high correlation with commodity prices and are expected to
continue to do so. In the event that correlation falls below allowable levels,
the gains or losses associated with the hedging instruments are immediately
recognized to the extent that correlation is lost. In the fourth quarter of
1995, the Company recognized a pretax loss of $8.4 million due to the loss of
correlation of the NYMEX futures market for natural gas with the price of
natural gas in certain parts of the country.

    Trading Activities - The Company's trading portfolio consists of short- and
long-term energy-related purchase and sale commitments (physical and
derivative). All of these investments and commitments are valued at market or
fair value and accounted for under mark-to-market accounting guidelines. The
fair value of these commitments are recorded under the headings of Assets and
Liabilities from Price Risk Management Activities in the Consolidated Balance
Sheets. The change in fair value of these commitments is recognized in income
currently and is recorded as revenue in the Consolidated Statements of Income.
Such fair values or market values are subject to change in the near term and
reflect the Company's best estimate of market prices considering various factors
including closing exchange and over-the-counter broker quotations, the terms of
the contract, credit considerations, time value and volatility factors
underlying the positions (see Note 3).

    Environmental Expenditures - The Company provides for environmental
liabilities when environmental assessments and/or remediation are probable and
such costs to the Company can be reasonably estimated. Accruals for
environmental remediation liabilities are not material and have not been
discounted.

    Stock-Based Compensation - The Company follows the provisions of Accounting
Principles Board Opinion (APB) No. 25 for its stock-based compensation awards
(see Note 10).

    Issuance of Stock by Subsidiary - The Company follows an accounting policy
of income statement recognition for issuances of stock by a subsidiary. (See
Note 2.)

    Income Taxes - The Company follows a liability and asset approach in
accounting for income taxes. Deferred tax liabilities and assets are determined
using the tax rate for the period in which those amounts are expected to be paid
or received. (See Note 8.)

    Earnings Per Share - In 1997, the Financial Accounting Standards
Board (FASB) issued Statement of Finan-

                                       52

                                     II-25
<PAGE>   55

Sonat Inc. and Subsidiaries

cial Accounting Standards (SFAS) No. 128, Earnings per Share. SFAS No. 128
replaced the calculation of primary and fully diluted earnings per share with
basic (earnings per share of common stock) and diluted (earnings per share of
common stock-assuming dilution) earnings per share. Unlike primary earnings per
share, basic earnings per share excludes any dilutive effects of options,
warrants and convertible securities. Diluted earnings per share is very similar
to the previously reported fully diluted earnings per share. All earnings per
share amounts for all periods have been presented, and where appropriate,
restated to conform to the SFAS No. 128 requirements (see Note 10).

2    CHANGES IN OPERATIONS

Sonat Marketing Company L.P. (Sonat Marketing) was formed in September 1995 and
is jointly owned by the Company and a subsidiary of AGL Resources, Inc. Sonat's
wholly owned subsidiary, Sonat Marketing Company, contributed all of its assets
and liabilities except $32.0 million of accounts receivable and Atlanta Gas
Light Company, another subsidiary of AGL Resources, contributed $32.0 million in
cash to Sonat Marketing in exchange for a 35 percent ownership interest. AGL
Resources has certain rights to resell to the Company its interest in Sonat
Marketing, including a right until August 31, 2000, to receive the greater of
fair market value or a formula price. The pretax gain on the transaction of
approximately $23.4 million, which is included in Other Deferred Credits in the
Consolidated Balance Sheet, has been deferred.

    In June 1995, the Company sold back to Baker Hughes Incorporated for $167.0
million the four million shares of Baker Hughes convertible preferred stock that
the Company received as partial consideration for its sale of Teleco Oilfield
Services Inc. to Baker Hughes in 1992. The sale resulted in an after-tax loss of
$8.2 million, or $.09 per share.

    In July 1995, the Company made a capital contribution of its remaining
shares of Sonat Offshore Drilling Inc.'s common stock to Sonat Exploration
Company. On July 26, 1995, Sonat Exploration sold in an underwritten public
offering these shares of Sonat Offshore common stock at $30.25 per share. The
net proceeds after underwriters' discounts and commissions were $326.0 million,
which resulted in a pretax gain of $188.0 million. The Company realized an
after-tax gain of $110.1 million, or $1.27 per share, on the transaction.

    In April 1995, Sonat Power Marketing Inc. was formed to market electric
power. In the second quarter of 1996, AGL Resources acquired a 35 percent
ownership interest in Sonat Power Marketing L.P. (Sonat Power Marketing), to
which Sonat Power Marketing Inc. contributed all of its assets and liabilities.
The transaction resulted in a $.5 million pretax gain, which is included in
Other income, net in the Consolidated Statements of Income.

3    FINANCIAL INSTRUMENTS

Derivative Commodity Instruments Held or Issued for Trading
Purposes

The Company, through Sonat Marketing, began a trading operation in June 1997
that maintains active trading positions in natural gas futures, swap and option
contracts and limits its risk to changes in the value of its outstanding
positions through the use of Value-at-Risk models, establishment of offsetting
positions, and limit and monitoring procedures. The trading operation also
enters into natural gas purchase and sale commitments. These activities
constitute its trading business and are essential to provide customers with
market products at competitive prices. All of these trading positions are
reported at fair value and recorded under the heading of Assets and Liabilities
from Price Risk Management Activities (current and long-term) in the
Consolidated Balance Sheet. The change in fair value is recognized in revenues
as it occurs. Fair value is subject to change and reflects management's best
estimate of market prices considering various factors including closing exchange
and over-the-counter quotations, time value and volatility factors underlying
the commitments. These market prices are adjusted to reflect the potential
impact of liquidating Sonat Marketing's position in an orderly manner over a
reasonable period of time under present market conditions.

                                       53

                                     II-26
<PAGE>   56


Notes to Consolidated Financial Statements

NOTE 3 (CONTINUED)

    The amounts disclosed below represent the end of period fair value and the
average fair value (period commenced June 1, 1997) of the trading portfolio.

<TABLE>
<CAPTION>

                                       (In Thousands)
                             ------------------------------------
                                Fair Value     Average Fair Value
                             (Carrying Amount)    for the Year
                              as of 12/31/97     Ended 12/31/97
- -----------------------------------------------------------------
<S>                          <C>               <C>    
Natural Gas Trading:
   Assets                        $ 119,836          $57,079
   Liabilities                     108,460           51,450
=================================================================    
</TABLE>


Derivative Commodity Instruments Held or Issued for Purposes
Other Than Trading

Sonat Exploration Company's production is hedged by entering into intercompany
swaps with Sonat Marketing. The exposure that Sonat Marketing assumes from Sonat
Exploration is then hedged by entering into derivative instruments with outside
counterparties. Sonat Marketing and Sonat Power Marketing also hedge third party
purchases and sales by entering into commodity futures, swaps and options. The
information below represents the consolidated derivative positions that were
open as of December 31, 1997, and the fair value of those positions. Not
included are the related physical positions that these derivative positions
hedge.


<TABLE>
<CAPTION>


                      (TBtu)            (In Thousands)
                   ---------------------------------------
                                          Fair Value
                   Notional Volume    As of December 31,
                   ---------------------------------------
                   1997    1996        1997        1996
- ----------------------------------------------------------
<S>                <C>     <C>      <C>         <C>       
Natural Gas:
   Futures         18.9     12.1    $   (873)   $  (5,518)
   Swaps           75.4    209.5     (29,764)     (31,372)
   Options         31.5     64.5        (516)      (1,900)
Crude Oil:
   Futures           --     12.9          --       (3,379)
- ----------------------------------------------------------
</TABLE>

    Deferred amounts on open futures positions will mature over 1998
and 1999.

Credit Risk from Derivative Activities

NYMEX traded futures are guaranteed by the NYMEX and have nominal credit risk.
On all other transactions described above, the Company is exposed to credit risk
in the event of nonperformance by the counterparties. Due to changes in market
conditions, the value of swaps and options can change in relation to their value
to the Company. The energy services group has established policies and
procedures to evaluate potential counterparties for creditworthiness before
entering into over-the-counter swap and option agreements. The credit risk
resulting from in-the-money swaps is monitored on a regular basis against
established collateralization limits. At December 31, 1997, the market value of
the Company's in-the-money swaps and options was $5.6 million, and all
counterparties were within collateral limits. Reserves for credit risk are
established as necessary.

Financial Risk

On January 22, 1996, the Company entered into a forward rate agreement to hedge
the interest rate risk of an anticipated future borrowing under an existing
shelf registration statement. In September 1996, due to revised expectations of
external financing requirements, 50 percent of the forward rate agreement was
liquidated resulting in a gain of $3.9 million. A gain of $2.4 million was
recognized upon final settlement of this agreement in 1997.

Other Financial Instruments

The carrying amounts and fair values of the Company's financial instruments,
other than derivative instruments, are as follows:

<TABLE>
<CAPTION>

                                      (In Thousands)

                              ----------------------------
December 31, 1997             Carrying Amounts  Fair Value
- ----------------------------------------------------------
<S>                             <C>             <C>
Cash and Cash Equivalents       $   13,512      $   13,512
Restricted Cash                    115,956         115,956
Investment in Debt Securities       47,177          48,047
Gas Supply Realignment Costs         3,630           3,630
Unsecured Notes                    446,721         446,721
Long-Term Debt                   1,053,742       1,096,354
- ----------------------------------------------------------
</TABLE>


                                       54
                                    
                                     II-27
<PAGE>   57
Sonat Inc. and Subsidiaries


<TABLE>
<CAPTION>
                                             (In Thousands)
                                  --------------------------------
December 31, 1996                 Carrying Amounts      Fair Value
- ------------------------------------------------------------------
<S>                               <C>                   <C>     
Cash and Cash Equivalents             $ 29,639           $ 29,639
Investment in Debt Securities           42,058             43,337
Gas Supply Realignment Costs            11,144             11,144
Unsecured Notes                        158,030            158,030
Long-Term Debt                         925,962            963,026
- ------------------------------------------------------------------
</TABLE>

         The following methods and assumptions were used by the Company in
estimating its fair value disclosures for balance sheet financial instruments:

         Cash and cash equivalents, restricted cash, gas supply realignment
(GSR) costs and unsecured notes - The carrying amount reported in the
Consolidated Balance Sheets approximates its fair value.

         Investment in debt securities - The fair values for marketable debt
securities are based on quoted market prices.

         Long-term debt - The fair values of the Company's long-term debt are
based on quoted market values or estimated using discounted cash flow analyses,
based on the Company's current incremental borrowing rates for similar types of
borrowing arrangements.

         All of the Company's financial instruments, other than certain
derivative instruments, are held for purposes other than trading.

         The Company's financial instruments that are exposed to concentrations
of credit risk consist primarily of cash equivalents, restricted cash deposits,
investments, accounts receivable and GSR costs which the Company expects to
recover from its customers.

         The Company's cash equivalents, restricted cash deposits and short-term
investments represent securities placed with various high investment grade
institutions. This investment practice limits the Company's exposure to
concentrations of credit risk.

         Accounts receivable of the Exploration and Production segment are
primarily from joint-interest partners, oil and gas marketing companies and
pipeline companies. A majority of its revenues are from Sonat Marketing, which
is headquartered in the Southeast. Accounts receivable of the Natural Gas
Transmission segment relate to business conducted with gas distribution
companies, municipalities, gas districts, industrial customers and interstate
pipeline companies in the Southeast. Accounts receivable of the Energy Services
segment relate to trading with other marketing companies, industrial end users
and local distribution companies, with primary concentration in the Gulf Coast,
Southeastern, Northeastern and Midwestern markets.

         The Company performs ongoing credit evaluations of its customers'
financial condition and, in some circumstances, requires collateral from its
customers. Accounts receivable are stated net of valuation allowances of $7.9
million in 1997 and $9.7 million in 1996.

4 INVENTORIES

The table below shows the values of various categories of the Company's
inventories by segment.

<TABLE>
<CAPTION>
                                          (In Thousands)
                                       -------------------
December 31,                             1997        1996
- ----------------------------------------------------------
<S>                                    <C>         <C>
Exploration and Production:
  Materials and supplies               $13,499     $ 2,358

Natural Gas Transmission:
  Materials and supplies                21,529      24,197

Energy Services:
  Materials and supplies                   247          --
  Gas stored underground                26,418       3,938

Other                                       13           7
- ----------------------------------------------------------
                                       $61,706     $30,500
==========================================================
</TABLE>

5 UNCONSOLIDATED AFFILIATES

At December 31, 1997, the Company's investments in unconsolidated affiliates
totaled $491.7 million, and the Company's share of underlying equity in net
assets of the investees was $551.7 million. The difference is primarily due to
the excess over cost of the Company's share of the underlying equity in net
assets of Citrus Corp., which is being amortized over the depreciable life of
Citrus' assets. Through December 31, 1997, the Company's cumulative equity in
earnings of these unconsolidated affiliates was $329.1 million and cumulative
dividends received from them totaled $175.5 million.


                                                                              55
                                     II-28
<PAGE>   58
Notes to Consolidated Financial Statements


NOTE 5 (CONTINUED)

         The following table presents the components of equity in earnings of
unconsolidated affiliates:

<TABLE>
<CAPTION>
                                                   (In Thousands)
                                        ---------------------------------------
Years Ended December 31,                  1997           1996            1995
- -------------------------------------------------------------------------------
<S>                                     <C>            <C>             <C>     
COMPANY'S SHARE OF
 REPORTED EARNINGS (LOSSES)

Exploration and
  Production                            $    445       $    408        $    615
- -------------------------------------------------------------------------------
Natural Gas Transmission:
  Citrus Corp. (including
   $1,383,000 of
   amortization of basis
   difference in each year)               28,676         22,902          28,196
  Bear Creek Storage                      10,679         10,184           9,596
  Other                                    1,170           (554)           (239)
- -------------------------------------------------------------------------------
                                          40,525         32,532          37,553
- -------------------------------------------------------------------------------
Energy Services                              817              9              (5)
- -------------------------------------------------------------------------------
Other:
  Sonat Offshore Drilling                     --             --           6,734
  Other                                    1,233          1,262           1,361
- -------------------------------------------------------------------------------
                                           1,233          1,262           8,095
- -------------------------------------------------------------------------------
                                        $ 43,020       $ 34,211        $ 46,258
===============================================================================
</TABLE>

         Natural Gas Transmission Affiliates - Sonat owns 50 percent of Citrus,
the parent company of Florida Gas Transmission Company. A subsidiary of Southern
owns 50 percent of Bear Creek Storage Company, an underground gas storage
company.

         The following is summarized financial information for Citrus:

<TABLE>
<CAPTION>
                                                   (In Thousands)
                                   --------------------------------------------
Years Ended December 31,              1997              1996             1995
- -------------------------------------------------------------------------------
<S>                                <C>               <C>              <C>      
Revenues                           $ 735,402         $ 769,335        $ 682,387
Expenses (Income):
  Natural gas cost                   416,953           428,842          362,635
  Operating expenses                 107,370            94,573           94,647
  Depreciation and
    amortization                      60,470            83,563           81,227
  Allowance for funds
    used during
    construction                        (599)              153          (42,804)
  Interest and other                  79,162            91,926           99,238
  Income taxes                        17,460            27,240           33,818
- -------------------------------------------------------------------------------
Income Reported                    $  54,586         $  43,038        $  53,626
===============================================================================
</TABLE>


<TABLE>
<CAPTION>
                                                          (In Thousands)
                                                  ------------------------------
December 31,                                         1997               1996
- --------------------------------------------------------------------------------
<S>                                               <C>                 <C>
Assets
  Current                                         $   80,737          $  107,114
  Net transmission plant and
   property                                        2,346,123           2,362,038
  Other                                               67,671              84,900
- --------------------------------------------------------------------------------
                                                  $2,494,531          $2,554,052
================================================================================
Liabilities and Equity
  Current                                         $  133,481          $  211,228
  Long-term debt and other
   liabilities                                     1,496,724           1,533,084
  Stockholders' equity                               864,326             809,740
- --------------------------------------------------------------------------------
                                                  $2,494,531          $2,554,052
================================================================================
</TABLE>

         The following is summarized financial information for Bear Creek. No
provision for income taxes has been included since its income taxes are paid
directly by the joint-venture participants.

<TABLE>
<CAPTION>
                                                     (In Thousands)
                                         ---------------------------------------
Years Ended December 31,                   1997            1996            1995
- --------------------------------------------------------------------------------
<S>                                      <C>             <C>             <C>    
Revenues                                 $36,226         $36,258         $36,167
Expenses:
  Operating expenses                       4,440           4,817           5,408
  Depreciation                             5,430           5,415           5,399
  Other expenses, net                      4,997           5,657           6,167
- --------------------------------------------------------------------------------
Income Reported                          $21,359         $20,369         $19,193
================================================================================
</TABLE>


<TABLE>
<CAPTION>
                                                             (In Thousands)
                                                        ------------------------
December 31,                                              1997            1996
- --------------------------------------------------------------------------------
<S>                                                     <C>             <C>     
Assets
  Current                                               $  6,503        $  7,205
  Net plant and property                                 149,334         154,388
  Other                                                      296             338
- --------------------------------------------------------------------------------
                                                        $156,133        $161,931
================================================================================
Liabilities and Equity
  Current                                               $  8,298        $  8,525
  Long-term debt and other liabilities                    48,799          55,729
  Participants' equity                                    99,036          97,677
- --------------------------------------------------------------------------------
                                                        $156,133        $161,931
================================================================================
</TABLE>

         In 1995 Southern executed a Capital Contribution Agreement in
connection with the project financing for Bear Creek from The Prudential
Insurance Company of America. In the event that Bear Creek does not refinance
the remaining principal, this agreement provides that Southern and its partner
will contribute $21.0 million


                                                                              56
                                     II-29
<PAGE>   59
Sonat Inc. and Subsidiaries


each to Bear Creek on October 31, 2000, to provide funds to enable Bear Creek to
make a principal payment due under the financing.

6 PLANT, PROPERTY AND EQUIPMENT AND DEPRECIATION

Plant, property and equipment, by business segment, is shown in the following
table:

<TABLE>
<CAPTION>
                                              (In Thousands)
                                      ------------------------------
December 31,                             1997                1996
- --------------------------------------------------------------------
<S>                                   <C>                 <C>       
Exploration and Production            $2,990,516          $2,579,740
Natural Gas Transmission               2,456,773           2,422,845
Energy Services                           78,168              11,508
Other                                     72,407              70,190
- --------------------------------------------------------------------
                                      $5,597,864          $5,084,283
====================================================================
</TABLE>

         Plant, property and equipment includes construction work in progress of
$137.1 million and $108.0 million at December 31, 1997 and 1996, respectively.
Plant, property and equipment also includes $130.1 million and $124.8 million of
gas stored underground at December 31, 1997 and 1996, respectively.

         The accumulated depreciation, depletion and amortization amounts, by
business segment, are as follows:

<TABLE>
<CAPTION>
                                              (In Thousands)
                                      ------------------------------
December 31,                             1997                1996
- --------------------------------------------------------------------
<S>                                   <C>                 <C>       
Exploration and Production            $1,294,854          $1,075,016
Natural Gas Transmission               1,497,828           1,539,983
Energy Services                           33,254               3,143
Other                                     33,713              32,277
- --------------------------------------------------------------------
                                      $2,859,649          $2,650,419
====================================================================
</TABLE>

         The annual depreciation rates or useful productive lives, by business
segment, are as follows:

<TABLE>
<CAPTION>
                                    -------------------------------------
                                      1997          1996          1995
- -------------------------------------------------------------------------
<S>                                 <C>           <C>           <C>      
Natural Gas Transmission:
   Mainline transmission
    property                             2.0%          2.0%          2.0%
   Gas supply                            2.9%          2.9%          2.9%
   Gas gathering                         2.8%          2.8%          2.8%
   Underground storage
    facilities                           3.3%          3.3%          3.3%
   Liquefied natural gas
    facilities                           3.2%          3.2%          3.2%
Other                               2-30 yrs.     2-25 yrs.     3-20 yrs.
=========================================================================
</TABLE>

         The successful efforts method of accounting used for oil and gas
properties in the Exploration and Production segment results in the cost of
proved oil and gas properties and development dry holes being capitalized and
amortized on a unit-of-production basis over the life of remaining proved
reserves. Also included in amortization on a unit-of-production basis are the
estimated future dismantlement and abandonment costs.

         During the first part of 1997, Sonat Exploration's production was lower
than expected with most of the shortfall attributable to certain Gulf of Mexico
properties. In 1996 Sonat Exploration had completed two significant wells in
High Island Block 39 that together initially produced 89 million cubic feet of
natural gas equivalent per day, but ceased production in 1997. In addition,
other wells drilled in this area during 1997 did not yield material reserves. As
a result, it was determined in the third quarter of 1997 that the remaining
reserves for these properties would not recover the associated book value of
$39.4 million. As a result, the properties were written down by $39.0 million.
The impairment, which is included in depreciation, depletion and amortization
expense in the 1997 Consolidated Statement of Income, reduced net income by
$25.4 million, or $.30 per share. Fair value used in determining the impairment
adjustment was based on an estimate of future net cash flows discounted at a
market rate of interest.

         Primarily due to downward reserve revisions for certain properties in
its year-end reserve report, the Company reevaluated the recorded value of its
oil and gas assets in 1995. Based on this evaluation, the Company determined
that assets with a net book value of $98.4 million were impaired and therefore
adjusted their fair value by an estimate of future net cash flows discounted at
a market rate of interest. This $23.0 million impairment adjustment is included
in depreciation, depletion and amortization expense in the 1995 Consolidated
Statement of Income.


                                                                              57
                                     II-30
<PAGE>   60
Notes to Consolidated Financial Statements


7 DEBT AND LINES OF CREDIT

Long-Term Debt - Long-term debt consists of:

<TABLE>
<CAPTION>
                                                           (In Thousands)
                                                    ----------------------------
December 31,                                           1997              1996
- --------------------------------------------------------------------------------
<S>                                                 <C>               <C>       
Sonat Inc.
 Revolving Credit Agreement at 
  rates based on prime, inter-
  national or money-market 
  lending rates (an effective rate
  of 6.14% at December 31, 1997
  and 5.76% at December 31,
  1996) expiring on June 30, 2001                   $  130,000        $  155,000
 6.75% Notes due October 1, 2007                       100,000                --
 6 7/8% Notes due June 1, 2005                         200,000           200,000
 9 1/2% Notes due August 15, 1999                      100,000           100,000
 8.65% Notes due through
  July 29, 1997                                             --             9,286
 9.41% Notes due July 29, 1997                              --            35,000
 9% Notes due May 1, 2001                              100,000           100,000
 8.24% Senior Notes due through
  December 31, 2000                                      6,200             8,400
Southern Natural Gas Company
 6.70% Notes due October 1, 2007                       100,000                --
 7.85% Notes due January 15, 2002                      100,000           100,000
 8 5/8% Notes due May 1, 2002                          100,000           100,000
 8 7/8% Notes due
  February 15, 2001                                    100,000           100,000
South Georgia Natural Gas Company
 9.85% Term Loan due through
  December 31, 1997                                         --               880
 7.80% Term Loan due through
  December 31, 1997                                         --               400
Southern LNG Inc. 
 Promissory Note (an effective rate
  of 6.53% at December 31, 1997
  and 6.75% at December 31,
  1996) due through April 1, 1999                       10,000            15,000
Capital Leases and Other                                 7,542             1,996
- --------------------------------------------------------------------------------
Total Outstanding                                    1,053,742           925,962
Less Long-Term Debt Due Within
  One Year                                              11,008            53,707
- --------------------------------------------------------------------------------
                                                    $1,042,734        $  872,255
================================================================================
</TABLE>

         Annual maturities of long-term debt at December 31, 1997, are as
follows:

<TABLE>
<CAPTION>
Years                                     (In Thousands)
- --------------------------------------------------------
<S>                                       <C>
1998                                      $      11,008
1999                                            109,422
2000                                              3,120
2001                                            330,192
2002                                            200,000
2003-2007                                       400,000
- --------------------------------------------------------
                                          $   1,053,742
========================================================
</TABLE>

         Sonat has a bank revolving credit agreement that provides for periodic
borrowings and repayments of up to $500.0 million through June 30, 2001.
Borrowings are supported by unsecured promissory notes that, at the option of
the Company, will bear interest at the banks' prevailing prime or international
lending rate, or such rates as the banks may competitively bid. During 1997,
$1.730 billion was borrowed and $1.755 billion was repaid under the revolving
credit agreement, resulting in $130.0 million outstanding at December 31, 1997,
at an effective rate of 6.14 percent.

         In September 1997, Sonat and Southern issued a total of $200.0 million
under their shelf registration statements. Sonat issued $100.0 million of 6.75
percent Notes due October 1, 2007, at 99.748 percent to yield 6.785 percent.
Southern issued $100.0 million of 6.70 percent Notes due October 1, 2007, at
99.891 percent to yield 6.715 percent. The net proceeds were subsequently used
to repay amounts borrowed under Sonat's commercial paper program and under its
revolving credit agreement.

         Unsecured Notes - Loans under all short-term credit facilities are for
a duration of less than three months.

         At December 31, 1997, Sonat and Southern had available short-term lines
of credit of $200.0 million and $50.0 million, respectively, through May 26,
1998. Borrowings are available for a period of not more than 364 days and are in
the form of unsecured promissory notes that bear interest at rates based on the
banks' prevailing prime, international or money-market lending rates. At
December 31, 1997, no amounts were outstand-


58

                                     II-31
<PAGE>   61
Sonat Inc. and Subsidiaries


ing under Sonat's agreement. At December 31, 1996, Sonat had $21.0 million
outstanding under its agreement at a rate of 6.90 percent. At December 31, 1997
and 1996, no amounts were outstanding under Southern's agreement. (See Note 15.)

         Sonat had $446.6 million and $137.0 million, respectively, in
commercial paper outstanding at average rates of 6.31 percent and 5.76 percent
at December 31, 1997 and 1996, respectively.

8 INCOME TAXES

An analysis of the Company's income tax expense (benefit) is as follows:

<TABLE>
<CAPTION>
                                                  (In Thousands)
                                     -------------------------------------------
Years Ended December 31,               1997             1996             1995
- --------------------------------------------------------------------------------
<S>                                  <C>              <C>              <C>     
Current:
   Federal                           $ 12,435         $ 17,652         $ 71,871
   State                                8,067            4,021           (2,043)
- --------------------------------------------------------------------------------
                                       20,502           21,673           69,828
- --------------------------------------------------------------------------------
Deferred:
   Federal                             57,563           66,051           21,936
   State                                2,472            5,391            3,229
- --------------------------------------------------------------------------------
                                       60,035           71,442           25,165
- --------------------------------------------------------------------------------
Income Tax Expense                   $ 80,537         $ 93,115         $ 94,993
================================================================================
</TABLE>

         Net deferred tax liabilities are comprised of the following:

<TABLE>
                                                             (In Thousands)
                                                       -------------------------
December 31,                                             1997             1996
- --------------------------------------------------------------------------------
<S>                                                    <C>              <C>     
Deferred Tax Liabilities:
   Depreciation                                        $382,945         $330,047
   Inventories                                           11,573           11,572
   Other                                                  8,564            6,372
- --------------------------------------------------------------------------------
     Total deferred tax liabilities                     403,082          347,991
- --------------------------------------------------------------------------------
Deferred Tax Assets:
   GSR and other transition costs                        10,210           13,228
   Employee benefits                                     10,777           11,897
   Tax credit carryforwards                              12,925            7,277
   Other accounting accruals                              7,954           16,705
   Other                                                 16,617           14,320
- --------------------------------------------------------------------------------
     Total deferred tax assets                           58,483           63,427
- --------------------------------------------------------------------------------
Net Deferred Tax Liabilities                           $344,599         $284,564
================================================================================
</TABLE>

         The Company has not provided a valuation allowance to offset deferred
tax assets because, based on the weight of available evidence, it is more likely
than not that all deferred tax assets will be realized.

         Consolidated income tax expense is different from the amount computed
by applying the U.S. federal income tax rate to income before income tax. The
reasons for this difference are as follows:

<TABLE>
<CAPTION>
                                                   (In Thousands)
                                      ------------------------------------------
Years Ended December 31,                 1997            1996            1995
- --------------------------------------------------------------------------------
<S>                                   <C>             <C>             <C>      
Income Tax Expense at
   Statutory Federal
   Income Tax Rates                   $  89,760       $ 103,006       $ 100,758
Increases (Decreases)
   Resulting From:
     State income taxes,
       net of federal
       income tax benefit                 6,851           6,118             771
     Non-conventional
       fuel tax credits                  (7,220)         (9,465)        (11,380)
     Refunds and
       adjustment of
       accrued tax position                  47             880          14,639
     Dividend exclusion                  (8,029)         (6,413)        (11,248)
     Other                                 (872)         (1,011)          1,453
- --------------------------------------------------------------------------------
Income Tax Expense                    $  80,537       $  93,115       $  94,993
================================================================================
</TABLE>

9 COMMITMENTS AND CONTINGENCIES

Rate Matters - Periodically, Southern and its subsidiaries make general rate
filings with the Federal Energy Regulatory Commission (FERC) to provide for the
recovery of cost of service and a return on equity. The FERC normally allows the
filed rates to become effective, subject to refund, until it rules on the
approved level of rates. Southern and its subsidiaries provide reserves relating
to such amounts collected subject to refund, as appropriate, and make refunds
upon establishment of the final rates. At December 31, 1997, Southern's rates
are established by a settlement that was approved by FERC orders issued in 1995
and 1996. All of its customers are parties to the settlement.

         Leases - The Company has operating lease commitments expiring at
various dates, principally for office space and equipment. The Company has no
significant capital leases.


                                     II-32                                    59
<PAGE>   62
Notes to Consolidated Financial Statements


NOTE 9 (CONTINUED)

         Rental expense for all operating leases is summarized below.

Rental Expense

<TABLE>
<CAPTION>
                                                      (In Thousands)
                                           -------------------------------------
Years Ended December 31,                     1997           1996           1995
- --------------------------------------------------------------------------------
<S>                                        <C>            <C>            <C>    
Non-Affiliated Operating
   Leases                                  $20,028        $18,149        $18,152
Affiliated Operating Leases                  3,544          3,680          3,635
- --------------------------------------------------------------------------------
                                           $23,572        $21,829        $21,787
================================================================================
</TABLE>

         At December 31, 1997, future minimum payments for non-cancelable
operating leases for the years 1998 through 2002 are $8 million or less per
year. Future minimum rentals to be received under subleases for the years 1998
through 2002 are less than $2 million per year.

10 CAPITAL STOCK AND STOCK-BASED COMPENSATION

Per-share prices of the Company's common stock, based on the New York Stock
Exchange listing of composite transactions, and dividends paid per common share
for the last two years are summarized below.

Price Range and Dividends Paid Per Common Share

<TABLE>
<CAPTION>
                                         (Unaudited)
                          ---------------------------------------
Quarter                           1997                 1996
- -----------------------------------------------------------------
<S>                       <C>        <C>        <C>       <C>
Price Range High-Low
   First                  $57      - $45 1/2    $37 1/4 - $31 1/8
   Second                  59 1/8  -  50 5/8     45 3/8 -  36 1/8
   Third                   54 1/4  -  45 3/8     47 1/2 -  41
   Fourth                  51 5/16 -  42 1/4     54 3/4 -  44 1/8
=================================================================
Dividends Paid
   First                             $   .27              $   .27
   Second                                .27                  .27
   Third                                 .27                  .27
   Fourth                                .27                  .27
- -----------------------------------------------------------------
                                     $  1.08              $  1.08
=================================================================
Shareholders of
   Record at Year-End                 11,258               12,020
=================================================================
</TABLE>

         The Company had no restrictions on the payment of dividends at December
31, 1997.

         The Company has a Preference Share Rights Plan designed to protect the
interest of stockholders in the event of a hostile attempt to take over the
Company and to make it more difficult for a person to gain control of the
Company in a manner or on terms not approved by the Board of Directors. The plan
provides for the issuance of one right with respect to each outstanding share of
common stock. The rights issued under the plan are redeemable at any time by the
Company before their expiration on February 3, 2006, unless certain triggering
events have occurred. The rights outstanding under the plan are exercisable for
one one-hundredth of a share of Series A Participating Preference Stock, par
value $1.00, with each share having substantially the rights and preferences of
100 shares of common stock. As of December 31, 1997, 1,000,000 shares of Series
A Participating Preference Stock were reserved for issuance under this plan.

         Earnings Per Share - The following table presents the computation of
basic and diluted earnings per share of common stock:

<TABLE>
<CAPTION>
                                                  (In Thousands, Except
                                                    Per-Share Amounts)
                                          --------------------------------------
Years Ended December 31,                    1997           1996           1995
- --------------------------------------------------------------------------------
<S>                                       <C>            <C>            <C>     
Numerator:
   Net income                             $175,920       $201,189       $192,888
================================================================================
Denominator:
Denominator for Basic
  Earnings Per Share:
    Weighted average
    number of shares
    of common stock
    outstanding                             85,941         86,211         86,270
Effect of Dilutive Securities:
    Common stock
    equivalents applicable
    to outstanding stock
    options                                  1,570          1,353            832
- --------------------------------------------------------------------------------
Denominator for Diluted
  Earnings Per Share:
    Adjusted weighted
    average shares using
    treasury stock method
    for assumed conversions                 87,511         87,564         87,102
================================================================================
Earnings Per Share of
  Common Stock                            $   2.05       $   2.33       $   2.24
================================================================================
Earnings Per Share of
  Common Stock -
  Assuming Dilution                       $   2.01       $   2.30       $   2.21
================================================================================
</TABLE>

         See Note 15 for information regarding the issuance of additional shares
of common stock.


60                                   II-33
<PAGE>   63
Sonat Inc. and Subsidiaries


         Executive Award Plan - The Company has an Executive Award Plan that
provides awards to certain key employees in the form of stock options,
restricted stock and stock appreciation rights (SARs) in tandem with any or all
stock options. In years prior to 1991, tax offset payments were generally
provided in conjunction with these awards. SARs permit the holder of an
exercisable option to surrender that option for an amount equal to the excess of
the market price of the common stock on the date of exercise over the option
price (appreciation). The appreciation is payable in cash, common stock or a
combination of both. SARs are subject to the same terms and conditions as the
options to which they are related. Commencing in November 1995, the Company has
issued, in tandem with its regular stock options, SARs that are exercisable only
in the event of a change in control (limited SARs). In November 1995, the
Company also issued limited SARs to certain key employees with respect to all of
their then outstanding options. No other SARs have been issued since 1990. At
December 31, 1997, 161,000 SARs relating to the earlier periods were
outstanding. All options granted since December 1992 have 10-year terms and vest
and become fully exercisable at the end of five years of continued employment.
Options issued after 1992 also contain an acceleration provision dependent upon
a specified increase in the Company's stock price. Options granted prior to
December 1992 vested over three years and had no accelerated vesting provisions.
The Company issued 80,100 shares of restricted stock with a $43 13/16 per share
market value to employees during 1997 and 97,000 shares with a $52.00 per share
market value during 1996. At December 31, 1997, 173,498 of the 531,800
cumulative restricted shares issued have vested. A new plan was authorized
during 1995 which made an additional four million shares available for issuance.

         The Company has elected to follow APB No. 25, Accounting for Stock
Issued to Employees, and related Interpretations in accounting for its employee
stock options. Under APB No. 25, compensation expense is recognized for the
difference between the option price and market value on the measurement date for
variable stock option awards and restricted stock grants. No compensation
expense is recognized for options the Company issued after 1990 because the
exercise price of the stock options equals the market price of the underlying
stock on the date of grant.

         Stock-based compensation increased pretax income by $2.0 million in
1997 and decreased it by $13.2 million in 1996 and $7.9 million in 1995.

         Pro forma information regarding net income and earnings per share is
required by SFAS No. 123, Accounting for Stock-Based Compensation, and has been
determined as if the Company had accounted for its employee stock options under
the fair value method of the Statement. The fair value for these options was
estimated at the date of grant using a Black-Scholes option pricing model with
the following weighted-average assumptions for 1997 and 1996, respectively:
interest rates (zero-coupon U.S. government issues with a remaining life of six
years) of 5.93 percent and 6.10 percent; dividend yields of 2.47 percent and
2.35 percent; volatility factors of the expected market price of the Company's
common stock of .266 and .255; and a weighted-average expected life of the
options of six years.

         The Black-Scholes option valuation model was developed for use in
estimating the fair value of traded options which have no vesting restrictions
and are fully transferable. In addition, option valuation models require the
input of highly subjective assumptions including the expected stock price
volatility. Because the Company's employee stock options have characteristics
significantly different from those of traded options, and because changes in the
subjective input assumptions can materially affect the fair value estimate, in
management's opinion, the existing models do not necessarily provide a reliable
single measure of the fair value of its employee stock options.

         The Company's pro forma information follows:

<TABLE>
<CAPTION>
                                         (In Thousands, Except
                                           Per-Share Amounts)
                                 --------------------------------------
Years Ended December 31,           1997           1996           1995
- -----------------------------------------------------------------------
<S>                              <C>            <C>            <C>
Net Income:
   As reported                   $175,920       $201,189       $192,888
   Pro forma                      174,697        198,522        192,843
Earnings Per Share:
   As reported                   $   2.05       $   2.33       $   2.24
   Pro forma                         2.03           2.30           2.24
=======================================================================
</TABLE>



                                     II-34                                    61
<PAGE>   64
Notes to Consolidated Financial Statements


NOTE 10 (CONTINUED)

         For purposes of the pro forma disclosures, the estimated fair value of
the options is amortized to expense over the options' vesting period, which is
five years for the awards. However, since all of the 1995 stock option grants
vested under an accelerated vesting clause in 1996, the entire remaining cost
for that award is reflected in 1996. Because the Company's stock options vest
generally over five years and additional awards are typically made each year,
the above pro forma disclosures are not likely to be representative of the
effects on pro forma net income for future years.

         A summary of the Company's stock option activity and related
information follows:

<TABLE>
<CAPTION>
                                      ----------------------------------------------------------------------------------------
Years Ended December 31,                        1997                          1996                         1995
- ------------------------------------------------------------------------------------------------------------------------------
                                                     Weighted-Avg.                 Weighted-Avg.                 Weighted-Avg.
                                        Options     Exercise Price    Options     Exercise Price    Options     Exercise Price
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                   <C>           <C>             <C>           <C>             <C>           <C>
Outstanding - Beginning of Year        4,178,226        $30.16        4,578,600       $25.24       4,358,820        $23.52
Granted                                  712,400         43.81          633,700        52.00         682,300         32.25
Exercised                               (453,907)        25.69       (1,013,954)       21.58        (450,020)        19.06
Forfeited                                (20,500)        46.90          (20,120)       31.81         (12,500)        27.33
- ------------------------------------------------------------------------------------------------------------------------------
Outstanding - End of Year              4,416,219         32.74        4,178,226        30.16       4,578,600         25.24
==============================================================================================================================
Exercisable - End of Year              3,217,419         27.38        3,544,526        26.26       2,566,520         21.55
==============================================================================================================================
Shares Authorized for Future Grants    2,884,700                      3,597,100                    4,230,800
==============================================================================================================================
Fair Value of Options
   Granted During the Year            $    12.50                    $     14.87                   $     6.33
==============================================================================================================================
</TABLE>

         The following table summarizes information about stock options
outstanding at December 31, 1997:

<TABLE>
<CAPTION>
                                      Options Outstanding                               Options Exercisable
                          ----------------------------------------------------------------------------------------
                                         Weighted-Avg.
                             Number        Remaining                                 Number
  Range of Exercise       Outstanding     Contractual         Weighted-Avg.        Exercisable       Weighted-Avg.
       Prices               12/31/97         Life            Exercise Price         12/31/97        Exercise Price
- ------------------------------------------------------------------------------------------------------------------
<S>         <C>           <C>            <C>                 <C>                   <C>              <C>
$13.625  -  $17.4375         476,624          3.2                $15.75               476,624           $15.75
$21.125  -  $29.125        1,300,380          5.7                 25.51             1,300,380            25.51
$30.00   -  $32.25         1,308,915          6.8                 31.01             1,308,915            31.01
$43.8125 -  $52.00         1,330,300          9.5                 47.62               131,500            52.00
- ------------------------------------------------------------------------------------------------------------------
                           4,416,219                                                3,217,419
==================================================================================================================
</TABLE>

         Directors' Restricted Stock Plan - The Company has a Restricted Stock
Plan for non-employee members of the Board of Directors of the Company. Full
rights vest over a maximum of five years. The Company did not issue any shares
under this plan during 1997 and 1996. At December 31, 1997, 33,460 of the 37,460
cumulative shares granted have vested.

         Treasury Stock - The Company's stock repurchase program has been
extended to December 31, 1998, which allows for the repurchase of up to
1,000,000 additional shares of common stock. Shares purchased are being reissued
in connection with employee stock options and restricted stock programs.

         Serial Preference Stock - At December 31, 1997 and 1996, there were
10,000,000 shares of $1.00 par value Serial Preference Stock authorized, with
none issued.

11 RETIREMENT PLANS AND OTHER POSTEMPLOYMENT BENEFITS

Retirement Plans - Sonat has a trusteed, non-contributory, tax qualified defined
benefit retirement plan (the Retirement Plan) covering substantially all
employees of the Company. A supplemental benefit plan (the Supplemental Plan)
that provides retirement benefits in excess


62                                   II-35
<PAGE>   65
Sonat Inc. and Subsidiaries


of those allowed under the Company's tax qualified retirement plan is also in
effect for the Company. Benefits under the plans are based on a combination of
years of service and a percentage of compensation. Benefits vest after a period
of five years.

         The Company determines the amount of funding to the Retirement Plan on
a year-to-year basis, with amounts consistent with minimum and maximum funding
requirements established by various governmental bodies. Amounts are being
placed in a trust established to provide benefits under the Supplemental Plan.
However, this trust is not subject to any funding requirements. At December 31,
1997, this trust had assets with a fair market value of $41.7 million available
to pay benefits. These assets are not considered plan assets under SFAS No. 87,
Employers' Accounting for Pensions.

         The Company's net periodic pension (income) cost consists of the
following components:

<TABLE>
<CAPTION>
                                                 (In Thousands)
                                  ----------------------------------------------
Years Ended December 31,             1997              1996              1995
- --------------------------------------------------------------------------------
<S>                               <C>               <C>               <C>      
Service Cost - Benefits
   Earned During
   the Period                     $   7,848         $   8,818         $   5,756
Interest Cost on
   Projected Benefit
   Obligation                        26,858            26,550            25,822
Gain on Assets                     (111,983)          (46,475)          (97,687)
Net Amortization and
   Deferral                          68,686             7,945            61,307
- --------------------------------------------------------------------------------
                                  $  (8,591)        $  (3,162)        $  (4,802)
================================================================================
</TABLE>

         The change in the net periodic pension income from 1996 to 1997 was
primarily attributable to the change in plan assumptions and the growth in plan
assets.

         The following table sets forth the assets and liabilities of the plans
and the amount of the net pension asset or liability recognized in the Company's
Consolidated Balance Sheets:

<TABLE>
<CAPTION>
                                                                                             (In Thousands)
                                                                             ------------------------------------------------
                                                                             Plan with Obligations     Plan with Obligations
                                                                               Less than Assets(1)     in Excess of Assets(2)
                                                                                   December 31,               December 31,
                                                                             ------------------------------------------------
                                                                                1997         1996         1997         1996
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>          <C>          <C>          <C>
Actuarial Present Value of Benefit Obligations:
   Vested benefit obligations                                                $ 274,768    $ 281,818    $  28,314    $  26,778
   Non-vested benefit obligations                                                8,844        8,149        1,573          532
- ------------------------------------------------------------------------------------------------------------------------------
   Accumulated benefit obligations                                             283,612      289,967       29,887       27,310
   Effect of projected future salary increases                                  48,704       58,271       10,483       11,277
- ------------------------------------------------------------------------------------------------------------------------------
   Projected benefit obligations                                               332,316      348,238       40,370       38,587
Plan Assets at Fair Value (3)                                                  550,982      461,299           --           --
- ------------------------------------------------------------------------------------------------------------------------------
Projected Benefit Obligations (in Excess of) or Less than Plan Assets          218,666      113,061      (40,370)     (38,587)
Unrecognized Net (Assets) or Obligations at Transition (4)                      (9,496)     (11,226)         204          256
Unrecognized Net (Gain) Loss (5)                                              (179,954)     (86,441)       7,387        6,763
Unrecognized Prior Service Cost                                                  3,954        4,853        3,134        3,540
Net Unamortized Deferred Charge from Early Retirement
   Termination Benefits (6)                                                        598          411           --           --
Adjustment Required to Recognize Minimum Pension Liability                          --           --         (242)          --
- ------------------------------------------------------------------------------------------------------------------------------
Net Pension Asset (Liability) Recognized in the Consolidated Balance Sheets  $  33,768    $  20,658    $ (29,887)   $ (28,028)
==============================================================================================================================
</TABLE>

(1) The Retirement Plan.

(2) The Supplemental Plan.

(3) Plan assets consist primarily of debt and equity securities, and investments
    in equity index and foreign index funds.

(4) Amortization periods for unrecognized net (asset) or obligation at 
    transition are 16.5 years for the Retirement Plan and 15 years for the
    Supplemental Plan.

(5) Amortization periods for unrecognized net (gain) loss are approximately 15.6
    and 15.7 years for the Retirement Plan and 15.2 and 14.2 years for the
    Supplemental Plan for 1997 and 1996, respectively.

(6) The amortization period for early retirement termination benefits is 10 
    years for the Retirement Plan.


                                     II-36                                    63
<PAGE>   66
Notes to Consolidated Financial Statements


NOTE 11 (CONTINUED)

         The provisions of SFAS No. 87 require recognition in the balance sheet
of an additional minimum liability and related intangible asset for pension
plans with accumulated benefits in excess of plan assets. At December 31, 1997,
an additional liability and intangible asset of $.2 million is reflected in the
Company's Consolidated Balance Sheet. There was no amount of additional minimum
liability required for 1996.

         The assumed rates used to measure the projected benefit obligations and
the expected earnings of plan assets are:

<TABLE>
<CAPTION>
                                         ------------------------------
Years Ended December 31,                 1997         1996         1995
- -----------------------------------------------------------------------
<S>                                      <C>          <C>          <C> 
Weighted Average Discount Rate           7.5%         7.0%         7.0%
Long-Term Rate of Return                 9.5%         9.5%         9.5%
Increase in Future Compensation
   Levels (Composite Rate):
     Retirement and
     Supplemental Plans                  5.0%         5.0%         5.5%
=======================================================================
</TABLE>

         Other Postemployment Benefits - The Company has plans that provide for
postretirement health care and life insurance benefits to substantially all of
its employees when they retire. The Company accrues the cost of postretirement
health care and life insurance benefits within the employees' active service
periods. The Company has elected to amortize the transition obligation over a
20-year period.

         The annual net periodic cost for postretirement health care and life
insurance benefits consists of the following components:

<TABLE>
<CAPTION>
                                                 (In Thousands)
                                     -------------------------------------------
Years Ended December 31,               1997             1996             1995
- --------------------------------------------------------------------------------
<S>                                  <C>              <C>              <C>     
Service Cost                         $  2,138         $  2,161         $  1,672
Interest Cost                           6,575            6,387            7,409
Return on Plan Assets                  (3,983)          (3,922)          (3,398)
Net Amortization and
   Deferral                             4,690            5,535            5,546
- --------------------------------------------------------------------------------
                                     $  9,420         $ 10,161         $ 11,229
================================================================================
</TABLE>

         The Company funds postretirement health care benefits for employees of
its regulated subsidiaries in an amount generally equal to the subsidiaries'
annual expense. The regulated subsidiaries currently recover their portion of
postretirement expense through rates. The Company also funds its Retiree Life
Insurance Plan for all its subsidiaries with the amount of funding determined on
a year-to-year basis with the objective of having assets equal plan liabilities.

         The following table sets forth the funded status at December 31, 1997
and 1996, for the Company's postretirement health care and life insurance plans:

<TABLE>
<CAPTION>
                                                    (In Thousands)
                                              ---------------------------
December 31,                                    1997              1996
- -------------------------------------------------------------------------
<S>                                           <C>               <C>     
Accumulated Postretirement
   Benefit Obligation:
     Retirees                                 $ 56,664          $ 63,750
     Fully eligible active plan
       participants                              6,962             5,221
     Other active plan participants             19,330            26,056
- -------------------------------------------------------------------------
                                                82,956            95,027
Plan Assets at Fair Value(1)                    38,923            32,595
- ------------------------------------------------------------------------
Accumulated Postretirement
   Benefit Obligation in Excess of
   Plan Assets                                 (44,033)          (62,432)
Unrecognized Transition Obligation              51,994            57,544
Unrecognized Net Gain(2)                       (31,649)          (15,013)
Net Unamortized Deferred Charge
   from Early Retirement
   Termination Benefits                          1,980               288
- -------------------------------------------------------------------------
Accrued Postretirement
   Benefit Liability                          $(21,708)         $(19,613)
=========================================================================
</TABLE>

(1) Retiree Medical Plan assets are comprised of equity securities, municipal
    tax exempt bonds and short-term investment funds. Retiree Life Insurance 
    Plan assets are held in an investment account, which consists primarily of
    fixed income securities.

(2) Amortization periods for unrecognized net gain are 15.1 and 15.4 years for 
    1997 and 1996, respectively.

         The assumed rates used to measure the projected benefit obligation and
the expected earnings of plan assets are:

<TABLE>
<CAPTION>
                                     --------------------
Years Ended December 31,             1997     1996   1995
- ---------------------------------------------------------
<S>                                  <C>     <C>     <C> 
Discount Rate                        7.5%    7.0%    7.0%
Long-Term Rate of Return:
   Medical assets                    5.5%    5.5%    5.5%
   Life insurance assets             7.5%    7.5%    7.5%
=========================================================
</TABLE>


64                                    II-37
<PAGE>   67
Sonat Inc. and Subsidiaries


         The rate of increase in the per capita costs of covered health care
benefits is assumed to be 4.5 percent in 1998 and for all future years.
Increasing the assumed health care cost trend rate by one percentage point would
increase the accumulated postretirement benefit obligation as of December 31,
1997, by approximately $9.7 million and increase the service cost and interest
cost components of the net periodic postretirement benefit cost by approximately
$1.1 million.

12 BUSINESS SEGMENT ANALYSIS

The Company's consolidated financial statements reflect operations in three
segments: Exploration and Production, Natural Gas Transmission and Energy
Services.

         The Company is engaged in the exploration for and the acquisition,
development and production of oil and natural gas through its Exploration and
Production segment. The oil and gas properties of the Exploration and Production
segment are located principally onshore in the Southern coastal states, in
various states in the Southwest and Midwest, and in federal waters offshore
Louisiana and Texas. It derives the majority of its revenues through sales to
Sonat Marketing (included in the Energy Services segment).

         The principal business of the Natural Gas Transmission segment is the
transmission of natural gas in interstate commerce. Its transmission systems are
located in the Southeastern United States. Transportation service is provided
for its distribution customers, direct industrial customers and other end-users,
gas producers, other gas pipelines, and gas marketing and trading companies. It
provides transportation service in both its gas supply and market areas. The
principal industries served directly by the natural gas transmission's pipeline
system and indirectly through its distribution customers' systems include the
chemical, pulp and paper, textile, primary metals, stone, clay and glass
industries.

         The Energy Services segment is engaged primarily in natural gas and
electric power marketing for industrial and commercial users, gas distribution
companies and gas producers throughout the Gulf Coast, Southeastern, Midwestern
and Northeastern United States and development of power systems and power
plants.

         The Company's results of operations, revenues from major customers,
capital expenditures and assets by business segment are shown in the following
tables. Intersegment sales are primarily gas sales by the Exploration and
Production segment and are priced at market rates. The Company has no foreign
operations.

         Operating profit is revenues less operating expenses. In determining
operating profit, none of the following items have been included: unallocated
general corporate revenues and expenses, interest, dividend and other income,
interest expense, income taxes and equity in earnings of unconsolidated
affiliates. Minority interest is included in Other Income, Net.



                                     II-38                                    65
<PAGE>   68
Notes to Consolidated Financial Statements


NOTE 12 (CONTINUED)

Business Segment Analysis

<TABLE>
<CAPTION>
                                                                               (In Thousands)
                                                               ------------------------------------------------
Years Ended December 31,                                           1997              1996              1995
- ---------------------------------------------------------------------------------------------------------------
<S>                                                            <C>               <C>               <C>        
Revenues:
   Exploration and production                                  $   558,456       $   565,654       $   403,488
   Natural gas transmission                                        393,292           398,828           412,327
   Energy services                                               3,723,932         2,592,703         1,249,903
   Other                                                            32,937            44,352            37,122
   Intersegment revenue                                           (533,993)         (562,523)         (348,499)
- ---------------------------------------------------------------------------------------------------------------
                                                               $ 4,174,624       $ 3,039,014       $ 1,754,341
===============================================================================================================

Depreciation, Depletion and Amortization:
   Exploration and production                                  $   269,336       $   236,419       $   239,167
   Natural gas transmission                                         47,769            48,293            52,274
   Energy services                                                   5,557             1,729               955
   Other, including depreciation of corporate equipment              3,352             1,751             6,318
- ---------------------------------------------------------------------------------------------------------------
                                                               $   326,014       $   288,192       $   298,714
===============================================================================================================

Operating Profit:
   Exploration and production                                  $   102,945       $   161,893       $    22,967
   Natural gas transmission                                        178,348           165,587           158,329
   Energy services                                                  10,613            10,184             6,510
   Other                                                             5,134             3,981             2,317
- ---------------------------------------------------------------------------------------------------------------
     Operating profit                                              297,040           341,645           190,123
Corporate Income (Expenses), Net                                       161              (368)           (1,190)
- ---------------------------------------------------------------------------------------------------------------
     Operating income                                              297,201           341,277           188,933
Equity in Earnings (Losses) of Unconsolidated Affiliates:
   Exploration and production                                          445               408               615
   Natural gas transmission                                         40,525            32,532            37,553
   Energy services                                                     817                 9                (5)
   Other                                                             1,233             1,262             8,095
Other Income, Net                                                    2,511             1,609           142,534
Interest Expense, Net                                              (86,275)          (82,793)          (89,844)
- ---------------------------------------------------------------------------------------------------------------
Income Before Income Taxes                                     $   256,457       $   294,304       $   287,881
===============================================================================================================
</TABLE>


Revenues from Major Customers

<TABLE>
<CAPTION>
                                                                               (In Thousands)
                                                               ------------------------------------------------
Years Ended December 31,                                           1997              1996              1995
- ---------------------------------------------------------------------------------------------------------------
<S>                                                            <C>               <C>               <C>        
Atlanta Gas Light:
   Natural gas transmission                                    $   130,425       $   134,062       $   136,806
   Energy services                                                  51,069            54,191            38,342
- ---------------------------------------------------------------------------------------------------------------
                                                               $   181,494       $   188,253       $   175,148
===============================================================================================================
Alabama Gas Corporation:
   Natural gas transmission                                    $    48,300       $    38,662       $    40,019
   Energy services                                                  87,994            86,062            50,134
- ---------------------------------------------------------------------------------------------------------------
                                                               $   136,294       $   124,724       $    90,153
===============================================================================================================
</TABLE>




66                                   II-39
<PAGE>   69
Sonat Inc. and Subsidiaries


     Both of the major customers or their affiliates participate with the 
Company in certain joint venture operations. 

     Capital expenditures for unconsolidated affiliates are accounted for on the
books of the unconsolidated affiliates and therefore are not reflected in the
totals appearing in the Company's Consolidated Financial Statements.

Capital Expenditures by Business Segment
<TABLE>
<CAPTION>
                                                                                  (In Thousands)
                                                                    ---------------------------------------
 Years Ended December 31,                                              1997           1996           1995
 ----------------------------------------------------------------------------------------------------------
 Consolidated:
 <S>                                                                <C>            <C>            <C>      
   Exploration and production (excluding exploratory costs)         $ 539,075      $ 368,423      $ 416,158
   Natural gas transmission                                           144,269        130,417         62,720
   Energy services                                                     10,978          4,736          2,758
   Other                                                                4,496          5,958          5,928
 ----------------------------------------------------------------------------------------------------------
                                                                      698,818        509,534        487,564
 ----------------------------------------------------------------------------------------------------------
 Unconsolidated Affiliates (Company's Portion):
   Exploration and production                                             512            222            723
   Natural gas transmission                                            41,772         15,138        100,489
   Other                                                                  244            490            525
 ----------------------------------------------------------------------------------------------------------
                                                                       42,528         15,850        101,737
 ----------------------------------------------------------------------------------------------------------
                                                                    $ 741,346      $ 525,384      $ 589,301
 ==========================================================================================================
</TABLE>

  Identifiable assets by business segment are those assets that are used in the
Company's operations in each business. Corporate assets are typically
investments, cash and equipment. Included in corporate assets at December 31,
1997, is restricted cash of $116.0 million relating to the merger with Zilkha
Energy (see Note 15).

Assets by Business Segment
<TABLE>
<CAPTION>
                                                                        (In Thousands)
                                                            ---------------------------------------
 December 31,                                                  1997           1996           1995
 --------------------------------------------------------------------------------------------------
 <S>                                                       <C>            <C>            <C>       

 Identifiable Assets:
   Exploration and production                              $1,930,752     $1,705,504     $1,592,399
   Natural gas transmission                                 1,187,880      1,181,440      1,285,404
   Energy services                                            752,717        524,768        261,751
   Other                                                       41,911         41,449         37,850
   Adjustments and eliminations                              (157,215)      (156,140)      (103,579)
 --------------------------------------------------------------------------------------------------
                                                            3,756,045      3,297,021      3,073,825
 --------------------------------------------------------------------------------------------------
 Investments in Unconsolidated Affiliates:
   Exploration and production                                   5,679          5,255          4,876
   Natural gas transmission                                   467,453        392,180        368,527
   Energy services                                              5,639          5,457            490
   Other                                                       12,910         11,668         12,188
 --------------------------------------------------------------------------------------------------
                                                              491,681        414,560        386,081
 Corporate Assets                                             183,788         63,078         51,535
 --------------------------------------------------------------------------------------------------
     Total Assets                                          $4,431,514     $3,774,659     $3,511,441
 ==================================================================================================
</TABLE>


                                     II-40                                    67

<PAGE>   70






Notes to Consolidated Financial Statements


13  OIL AND GAS OPERATIONS (UNAUDITED)

At December 31, 1997, the Company had interests in oil and gas properties that
are located primarily in Texas, Oklahoma, Louisiana, Arkansas, Alabama, and
offshore Louisiana and Texas in the Gulf of Mexico. The Company does not own or
lease any oil and gas properties outside the United States.


  Capitalized costs relating to oil and gas producing activities and related
accumulated depreciation, depletion and amortization were as follows:

Capitalized Costs
<TABLE>
<CAPTION>

                                       (In Thousands)
                                  -----------------------
December 31,                         1997         1996
- ---------------------------------------------------------
<S>                               <C>          <C>       
Oil and Gas Properties:
   Proved properties              $2,855,234   $2,461,709
   Unproved properties               135,281      118,031
- ---------------------------------------------------------
                                   2,990,515    2,579,740
Less Accumulated Depreciation,
   Depletion and Amortization      1,294,854    1,075,016
- ---------------------------------------------------------
                                  $1,695,661   $1,504,724
=========================================================
</TABLE>

  Costs incurred in oil and gas producing activities, whether capitalized or
expensed, were as follows:

 Costs Incurred
<TABLE>
<CAPTION>
                                                    (In Thousands)
                                        --------------------------------------
 Years Ended December 31,                  1997           1996          1995
 -----------------------------------------------------------------------------
 Property Acquisition Costs:
 <S>                                    <C>            <C>           <C>      
   Proved properties                    $   5,578      $  48,118     $ 208,866
   Unproved properties                     57,809         44,623        14,767
 Exploration Costs                         87,870         41,728        12,138
 Development Costs                        397,803        244,008       183,056
 -----------------------------------------------------------------------------
     Total Costs                        $ 549,060      $ 378,477     $ 418,827
 =============================================================================
</TABLE>

    Net quantities of proved developed and undeveloped reserves of natural gas
and crude oil, including condensate and natural gas liquids, and changes in such
quantities were as follows:

Reserve Data

<TABLE>
<CAPTION>
                                                           Liquids      Gas    Liquids        Gas     Liquids       Gas
                                                           (MBbls)     (Bcf)   (MBbls)       (Bcf)    (MBbls)      (Bcf)
                                                          ----------------------------------------------------------------
 December 31,                                                     1997                  1996                  1995
 -------------------------------------------------------------------------------------------------------------------------
 <S>                                                       <C>         <C>       <C>         <C>       <C>         <C>    
 Proved (Developed and Undeveloped) Reserves, Net:
   Beginning of year                                       51,437      1,691.6   44,228      1,505.5   31,627      1,367.3
   Revisions of previous estimates                          4,318        147.4    3,106         50.2      998         48.4
   Extensions, discoveries and other additions              7,973        237.2   11,597        295.2    6,774        173.8
   Purchases of reserves in place                             850         20.6    1,536        100.6   16,954        248.1
   Sales of reserves in place                                (433)       (43.7)  (1,724)       (55.1)  (6,656)      (149.0)
   Production                                              (6,376)      (203.3)  (7,306)      (204.8)  (5,469)      (183.1)
 -------------------------------------------------------------------------------------------------------------------------
     End of Year                                           57,769      1,849.8   51,437      1,691.6   44,228      1,505.5
 =========================================================================================================================
 Proved Developed Reserves:
   Beginning of year                                       28,961      1,188.3   25,613      1,060.1   22,269      1,001.0
   End of year                                             36,790      1,354.1   28,961      1,188.3   25,613      1,060.1
 =========================================================================================================================
</TABLE>

 MBbls-Thousands of barrels
 Bcf-Billion cubic feet



68                                   II-41
<PAGE>   71
         
Sonat Inc. and Subsidiaries


  The significant changes to reserves, other than acquisitions, dispositions or
production, are due to reservoir performance in existing fields and drilling of
additional wells in existing fields. Except for the merger with Zilkha Energy
(see Note 15), there were no major discoveries or other events, favorable or
adverse, that may be considered to have caused a significant change in the
estimated proved reserves since December 31, 1997.

  Results of operations from producing activities by fiscal year were as
follows:

Results of Operations
<TABLE>
<CAPTION>
                                                                 (In Thousands)
                                                     --------------------------------------
Years Ended December 31,                                1997          1996           1995
- -------------------------------------------------------------------------------------------
Net Revenues:
<S>                                                  <C>            <C>           <C>      
  Sales                                              $ 148,567      $ 155,274     $ 175,032
  Affiliated sales                                     409,889        410,380       228,456
- -------------------------------------------------------------------------------------------
    Total                                              558,456        565,654       403,488
Production Costs                                       (95,016)       (88,036)      (81,046)
Exploration Expenses                                   (32,164)       (21,669)       (9,065)
Depreciation, Depletion and Amortization              (269,336)      (236,419)     (239,167)
- -------------------------------------------------------------------------------------------
                                                       161,940        219,530        74,210
Income Tax Expense                                     (49,498)       (67,454)      (14,730)
- -------------------------------------------------------------------------------------------
Results of Operations from Producing 
  Activities (Excluding Corporate
  Overhead and Interest Costs)                       $ 112,442      $ 152,076     $  59,480
===========================================================================================
</TABLE>

         The standardized measure of discounted future net cash flows relating
to proved oil and gas reserves follows:

Standardized Measure of Discounted Future Net Cash Flows
<TABLE>
<CAPTION>
                                                                               (In Thousands)
                                                                 ----------------------------------------
December 31,                                                         1997           1996          1995
- ---------------------------------------------------------------------------------------------------------
<S>                                                              <C>            <C>           <C>        
Future Cash Inflows                                              $ 5,044,842    $ 7,041,438   $ 3,562,789
Future Production and Development Costs                           (1,584,670)    (1,627,378)   (1,286,074)
Future Income Tax Expenses                                          (784,231)    (1,407,017)     (354,041)
- ---------------------------------------------------------------------------------------------------------
Future Net Cash Flows                                              2,675,941      4,007,043     1,922,674
10% Annual Discount for Estimated Timing of Cash Flows              (938,593)    (1,313,286)     (611,206)
- ---------------------------------------------------------------------------------------------------------
Standardized Measure of Discounted Future Net Cash Flows         $ 1,737,348    $ 2,693,757   $ 1,311,468
=========================================================================================================
</TABLE>

    For the calculations in the preceding table, estimated future cash inflows
from estimated future production of proved reserves were computed using realized
oil and gas prices for the month of December of each respective year.


                                     II-42                                    69



<PAGE>   72



Notes to Consolidated Financial Statements


NOTE 13 (CONTINUED)

  The following are the principal sources of change in the standardized measure
of discounted future net cash flows:

Changes in Standardized Measure of Discounted Future Net Cash Flows
<TABLE>
<CAPTION>
                                                                                              (In Thousands)
                                                                                -----------------------------------------
Years Ended December 31,                                                            1997           1996          1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>             <C>            <C>        
Sales and Transfers of Oil and Gas Produced, Net of Production Costs            $  (463,440)    $ (477,618)    $ (322,442)
Net Changes in Prices and Production Costs                                       (1,475,578)     1,412,485        186,034
Extensions, Discoveries and Improved Recovery, Less Related Costs                   252,907        664,888        176,080
Changes in Estimated Future Development Costs                                       (30,609)           269        (15,362)
Development Costs Incurred During the Period                                        147,209        107,158        103,138
Revisions of Previous Quantity Estimates                                            158,508        125,181         49,129
Accretion of Discount                                                               352,460        145,877        105,288
Net Change in Income Taxes                                                          426,865       (683,539)      (180,223)
Purchases of Reserves in Place                                                       23,628        199,532        333,260
Sales of Reserves in Place                                                          (47,170)      (126,557)      (155,952)
Changes in Production Rates (Timing) and Other                                     (301,189)        14,613        (53,282)
- -------------------------------------------------------------------------------------------------------------------------
                                                                                $  (956,409)    $1,382,289     $  225,668
=========================================================================================================================
</TABLE>

14 QUARTERLY RESULTS (UNAUDITED)

Selected unaudited quarterly data is shown below:
<TABLE>
<CAPTION>
                                                               (In Thousands, Except Per-Share Amounts)
                                                         -------------------------------------------------------
                                                            1st            2nd            3rd             4th
                                                          Quarter        Quarter        Quarter         Quarter
- ----------------------------------------------------------------------------------------------------------------
<S>                                                      <C>            <C>            <C>            <C>       
1997 (1)
Revenues                                                 $1,072,143     $  815,304     $1,023,531     $1,263,646
Operating Income                                            106,909         65,469         28,537         96,286
Net Income                                                   66,846         36,223         12,970         59,881
================================================================================================================
Earnings Per Share of Common Stock                       $      .78     $      .42     $      .15     $      .70
================================================================================================================
Earnings Per Share of Common Stock-Assuming Dilution     $      .76     $      .41     $      .15     $      .69
================================================================================================================

1996
Revenues                                                 $  695,604     $  637,330     $  743,796     $  962,284
Operating Income                                             83,231         74,241         75,160        108,645
Net Income                                                   45,569         40,595         48,034         66,991
================================================================================================================
Earnings Per Share of Common Stock                       $      .53     $      .47     $      .56     $      .78
================================================================================================================
Earnings Per Share of Common Stock-Assuming Dilution     $      .52     $      .46     $      .55     $      .76
================================================================================================================
</TABLE>

(1) Net income for the third quarter of 1997 includes a charge of $25.4 million,
    or $.30 per share ($.29 diluted), related to the impairment of certain oil
    and gas properties.




70                                   II-43
<PAGE>   73

Sonat Inc. and Subsidiaries


15 SUBSEQUENT EVENTS

Debt Issuances and Lines of Credit - In late January 1998, Sonat made two public
offerings of Notes pursuant to its shelf registration statement. In one
offering, Sonat issued $100 million of 6 5/8 percent Notes due February 1, 2008,
at 99.531 percent to yield 6.69 percent. In the other offering, Sonat issued
$100 million of 7 percent Notes due February 1, 2018, at 99.787 percent to yield
7.02 percent. The net proceeds from the offerings were used for general
corporate purposes, including capital expenditures, working capital and
repayment of debt. 

  Also in late January 1998, Sonat completed a new 364-day $700 million
revolving credit facility with 20 banks. In connection with this new facility
the Company terminated existing lines of credit providing for up to $200 million
of borrowings.

  Zilkha Energy Merger - On January 30, 1998, following a special shareholders'
meeting, the Company completed the merger with Zilkha Energy Company.
Immediately thereafter Zilkha Energy's name was changed to Sonat Exploration GOM
Inc. Under the terms of the merger, to be accounted for as a pooling of
interests, the Company exchanged approximately 24.2 million common shares for
all the outstanding shares of Zilkha Energy. Zilkha Energy was a privately owned
exploration and production company. It operates in the shallow waters of the
Gulf of Mexico where it has accumulated the industry's largest net leasehold
position in the shallow-water area. 

  The financial position and results of operations of the Company and Zilkha
Energy will be combined in fiscal year 1998, retroactive to January 1, 1998. In
addition, all prior periods presented will be restated to give effect to the
merger.

  The following unaudited pro forma data summarizes the combined operating
results of the Company and Zilkha Energy as if the merger had occurred at the
beginning of the periods presented.



Condensed Combined Statements of Income
<TABLE>
<CAPTION>
                                                            (In Thousands, Except Per-Share Amounts)
                                                           -----------------------------------------
Years Ended December 31,                                      1997            1996           1995
- ----------------------------------------------------------------------------------------------------
<S>                                                        <C>             <C>            <C>       
Revenues                                                   $4,371,902      $3,204,199     $1,902,630
Net Income                                                 $   87,412      $  237,834     $  204,236
Earnings Per Share of Common Stock                         $      .79      $     2.15     $     1.85
Earnings Per Share of Common Stock-Assuming Dilution       $      .78      $     2.13     $     1.84
====================================================================================================
</TABLE>




                                     II-44                                    71

<PAGE>   74


SELECTED CONSOLIDATED FINANCIAL DATA

Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                                            (In Millions, Except Per-Share Amounts)
                                                         -------------------------------------------------------------------------
                                                            1997            1996           1995             1994            1993
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>             <C>             <C>              <C>            <C>
Revenues (1)                                             $4,174.6        $3,039.0        $1,754.3         $1,407.2       $ 1,562.9
Costs and Expenses (1)                                    3,877.4         2,697.7         1,565.4          1,237.8         1,330.0
- ----------------------------------------------------------------------------------------------------------------------------------
Operating Income                                            297.2           341.3           188.9            169.4           232.9
Other Income, Net (2)                                        45.5            35.8           188.8             60.7           182.1
Interest Expense, Net                                       (86.3)          (82.8)          (89.8)           (72.9)          (47.3)
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Continuing Operations before                                                                                            
  Extraordinary Item and Income Taxes                       256.4           294.3           287.9            157.2           367.7
Income Taxes                                                 80.5            93.1            95.0             15.8           102.7
- ----------------------------------------------------------------------------------------------------------------------------------
Income from Continuing Operations before                                                                                            
  Cumulative Effect of
  Accounting Changes                                        175.9           201.2           192.9            141.4           265.0
Income(Loss) from Discontinued Operations (3)                --              --              --               --              --
Extraordinary Loss, Net of Tax (4)                           --              --              --               --              (3.8)
Cumulative Effect of Change in Method of                                                                                        
  Accounting for Income Taxes                                --              --              --               --              --   
- ----------------------------------------------------------------------------------------------------------------------------------
Net Income                                               $  175.9        $  201.2        $  192.9         $  141.4       $   261.2
==================================================================================================================================
Earnings Per Share from Continuing                                                                                                 
  Operations before Extraordinary Item                   $   2.05        $   2.33        $   2.24         $   1.62       $    3.05
Earnings Per Share                                       $   2.05        $   2.33        $   2.24         $   1.62       $    3.01
Earnings Per Share from Continuing Operations before                                                                                
   Extraordinary Item-Assuming Dilution                  $   2.01        $   2.30        $   2.21         $   1.61       $    3.02
Earnings Per Share-Assuming Dilution                     $   2.01        $   2.30        $   2.21         $   1.61       $    2.98
Weighted Average Shares Outstanding (thousands)            85,941          86,211          86,270           87,119          86,703
Weighted Average Shares Outstanding-Assuming                                                                                       
  Dilution (thousands)                                     87,511          87,564        $ 87,102           88,070          87,614
Dividends Paid Per Share                                 $   1.08        $   1.08        $   1.08         $   1.08       $    1.04
==================================================================================================================================  
Assets                                                   $4,431.5        $3,774.7        $3,511.4         $3,530.7       $ 3,214.0
Debt Maturing within One Year                            $  457.7        $  211.7        $  237.7         $  219.3       $   232.9
Long-Term Debt                                            1,042.8           872.3           770.3            963.4           741.2
Stockholders' Equity                                      1,635.4         1,584.4         1,482.6          1,391.9         1,363.2
- ----------------------------------------------------------------------------------------------------------------------------------
Total Capitalization                                     $3,135.9        $2,668.4        $2,490.6         $2,574.6       $ 2,337.3
==================================================================================================================================
</TABLE>


(1) The 1993-1996 periods have been restated to reflect the reclassification of
    natural gas sales, natural gas cost and transition cost recovery to other
    revenues.

(2) In June 1993, the Company reduced its ownership of Sonat Offshore from 100
    percent to 40 percent. In July 1995, the Company disposed of its remaining
    shares of Sonat Offshore common stock.

(3) Discontinued operations include the measurement-while-drilling business as
    of 1991 and the marine transportation business in 1987. 

(4) In March 1993, the Company recognized a loss on the redemption of the
    Company's 7 1/4 Percent Zero Coupon, Subordinated Convertible Notes, which 
    were due September 6, 2005.


72                                   II-45
<PAGE>   75


Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                                    (In Millions, Except Per-Share Amounts)
                                                ------------------------------------------------------------------------------------
                                                   1992          1991           1990            1989          1988           1987
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>           <C>            <C>             <C>           <C>            <C>
Revenues (1)                                    $1,484.4      $ 1,421.0      $ 1,356.9       $1,659.2      $ 1,277.3      $ 1,344.9
Costs and Expenses (1)                           1,273.3        1,217.5        1,192.2        1,481.4        1,142.4        1,176.5
- -----------------------------------------------------------------------------------------------------------------------------------
Operating Income                                   211.1          203.5          164.7          177.8          134.9          168.4
Other Income, Net (2)                               22.0           14.7           69.8           47.1           12.5           41.5
Interest Expense, Net                              (96.3)        (117.7)        (102.6)         (75.2)         (54.4)         (54.6)
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Continuing Operations before
  Extraordinary Item and Income Taxes              136.8          100.5          131.9          149.7           93.0          155.3
Income Taxes                                        35.8           22.6           40.7           54.1           40.5           85.2
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Continuing Operations before
  Cumulative Effect of
  Accounting Changes                               101.0           77.9           91.2           95.6           52.5           70.1
Income(Loss) from Discontinued Operations (3)      111.4          (11.9)           2.7           (2.0)           2.2           24.9
Extraordinary Loss, Net of Tax (4)                    -              -              -              -              -              -
Cumulative Effect of Change in Method of
  Accounting for Income Taxes                         -              -              -              -            13.1             -
- -----------------------------------------------------------------------------------------------------------------------------------
Net Income                                      $  212.4      $    66.0      $    93.9       $   93.6      $    67.8      $    95.0
===================================================================================================================================
Earnings Per Share from Continuing
  Operations before Extraordinary Item          $   1.17      $     .91      $    1.07       $   1.17      $     .65      $     .86
Earnings Per Share                              $   2.47      $     .77      $    1.10       $   1.15      $     .84      $    1.17
Earnings Per Share from Continuing Operations
  before Extraordinary Item-Assuming Dilution   $   1.17      $     .91      $    1.06       $   1.17      $     .65      $     .86
Earnings Per Share-Assuming Dilution            $   2.47      $     .77      $    1.09       $   1.15      $     .83      $    1.17
Weighted Average Shares Outstanding (thousands)   85,945         85,771         85,612         81,683         81,238         81,091
Weighted Average Shares Outstanding-Assuming
  Dilution (thousands)                            86,142         86,084         85,915         81,898         81,326         81,305
Dividends Paid Per Share                        $   1.00      $    1.00      $    1.00       $   1.00      $    1.00      $    1.00
===================================================================================================================================
Assets                                          $3,165.3      $ 3,208.5      $ 3,045.1       $2,892.3      $ 2,969.5      $ 3,074.4
Debt Maturing within One Year                   $   20.1      $    79.2      $    63.1       $  155.9      $    50.4      $   225.6
Long-Term Debt                                   1,175.7        1,315.1        1,094.0          929.5          859.4          824.8
Stockholders' Equity                             1,172.3        1,042.7        1,060.5        1,035.3        1,010.2        1,023.0
- -----------------------------------------------------------------------------------------------------------------------------------
Total Capitalization                            $2,368.1      $ 2,437.0      $ 2,217.6       $2,120.7      $ 1,920.0      $ 2,073.4
===================================================================================================================================
</TABLE>


                                     II-46                                    73



<PAGE>   76
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE
 
     Sonat has not had a change in accountants within twenty-four months prior
to the date of its most recent financial statements or in any period subsequent
to such date.
 
                                      II-47
<PAGE>   77
 
                                    PART III
 
ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
     The information regarding the Directors and nominees for Director of Sonat
required by Item 401 of Regulation S-K is presented under the heading "Election
of Directors" in the Proxy Statement of Sonat Inc. dated as of March 21, 1998
(the "Proxy Statement"), which information is hereby incorporated by reference
herein. A copy of the Proxy Statement is filed as an exhibit to this report on
Form 10-K. Information regarding the executive officers of Sonat is presented
following Item 4 of this report, as permitted by General Instruction G(3) to
Form 10-K and Instruction 3 to Item 401(b) of Regulation S-K.
 
ITEM 11.  EXECUTIVE COMPENSATION
 
     The information required by Item 402 of Regulation S-K regarding executive
compensation is presented under the headings "Compensation of Outside Directors"
and "Compensation of Executive Officers" in the Proxy Statement, which
information is hereby incorporated by reference herein. Notwithstanding the
foregoing, the information provided under the headings "Report of the Executive
Compensation Committee" and "Performance Graph" in the Proxy Statement are not
incorporated by reference herein. A copy of the Proxy Statement is filed as an
exhibit to this report on Form 10-K.
 
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
     The information regarding the security ownership of certain beneficial
owners and management required by Item 403 of Regulation S-K is presented under
the heading "Ownership of Common Stock by Directors and Executive Officers" in
the Proxy Statement, which information is hereby incorporated by reference
herein. A copy of the Proxy Statement is filed as an exhibit to this report on
Form 10-K.
 
ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     The information regarding certain relationships and related transactions
required by Item 404 of Regulation S-K is presented on pages 1 and 2 of in the
Proxy Statement, which information is hereby incorporated by reference herein. A
copy of the Proxy Statement is filed as an exhibit to this report on Form 10-K.
 
                                      III-1
<PAGE>   78
 
                                    PART IV
 
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K
 
     (a) Index to Financial Statements, Financial Statement Schedules, and
Exhibits
 
  1. FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
Included in Part II of this report:
  Report of Ernst & Young LLP, Independent Auditors.........  II-18
  Consolidated Balance Sheets at December 31, 1997 and
     1996...................................................  II-19
  Consolidated Statements of Income for the years ended
     December 31, 1997, 1996, and 1995......................  II-21
  Consolidated Statements of Changes in Stockholders' Equity
     for the years ended December 31, 1997, 1996, and
     1995...................................................  II-22
  Consolidated Statements of Cash Flows for the years ended
     December 31, 1997, 1996, and 1995......................  II-23
  Notes to Consolidated Financial Statements................  II-24
</TABLE>
 
  2. FINANCIAL STATEMENT SCHEDULES
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
Included in Part IV of this report:
  Consolidated Financial Statements of Citrus Corp.
     (50-percent-owned joint venture) at December 31, 1997
     listed on Page IV-7  ..................................  IV-7
</TABLE>
 
     Financial statement schedules have been omitted as not applicable or
because the subject matter is either not present or is not present in amounts
sufficient to require submission of the schedule, in accordance with the
instructions contained in Regulation S-X, or the required information is
included in the financial statements or notes thereto.
 
     Financial statements of 50-percent-or-less-owned companies and joint
ventures, other than Citrus Corp., are not presented herein because such
companies and joint ventures do not meet the significance test.
 
  3. EXHIBITS(1)
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                              EXHIBITS
- -------                             --------
<C>       <S>
                  RESTATED CERTIFICATE OF INCORPORATION AND BY-LAWS
 3-(a)    Restated Certificate of Incorporation of Sonat Inc.
          (Restating the Certificate of Incorporation as in effect as
          of April 28, 1994) filed as Exhibit 3(a) to Form 10-Q of
          Sonat Inc. for the quarter ended March 31, 1994
 3-(b)    By-Laws of Sonat Inc. as amended and in effect December 1,
          1995, filed as Exhibit 3-(b) to Form 10-K of Sonat Inc. for
          the year 1995
 
                INSTRUMENTS DEFINING THE RIGHTS OF SECURITY HOLDERS
   4.1    Rights Agreement dated as of January 8, 1996, between Sonat
          Inc. and Chemical Mellon Shareholder Services, L.L.C., as
          Rights Agent, with exhibits, and (1) Amendment No. 1 dated
          as of November 22, 1998, filed as Exhibit 99 to Form 8-A of
          Sonat Inc. dated January 10, 1996, except (1), which was
          filed as Exhibit 4.1 to Form 8-K of Sonat Inc. dated January
          30, 1998
</TABLE>
 
- ---------------
 
(1) Sonat will furnish to requesting security holders any exhibit on this list
    upon the payment of a fee of $.10 per page up to a maximum of $5.00 per
    exhibit. Requests must be made in writing and should be addressed to
    Beverley T. Krannich, Secretary, Sonat Inc., P. O. Box 2563, Birmingham,
    Alabama 35202.
                                      IV-1
<PAGE>   79
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                              EXHIBITS
- -------                             --------
<C>       <S>
   4.2    Registration Rights Agreement, dated as of January 30, 1998,
          by and between Sonat Inc., Selim K. Zilkha, Michael Zilkha,
          the Selim K. Zilkha Trust and the Selim K. Zilkha (1996)
          Annuity Trust, filed as Exhibit 10.1 to Form 8-K of Sonat
          Inc. dated January 30, 1998
   4.3    Form of Indenture dated June 1, 1986, from Sonat Inc. to
          Manufacturers Hanover Trust Company, Trustee, as amended by
          (1) First Supplemental Indenture dated June 1, 1995, between
          Sonat Inc. and Chemical Bank, successor by merger to
          Manufacturers Hanover Trust Company, as Trustee, filed as
          Exhibit 4-(1) to Amendment No. 1 to Registration No. 33-5947
          dated June 4, 1986, except (1), which was filed as Exhibit
          4-(1) to Form 8-K of Sonat Inc. dated June 6, 1995
   4.4    Specimen Note of Sonat Inc. for the $200 million 6 7/8%
          Notes due June 1, 2005, issued under Registration Statement
          No. 33-62166, filed as Exhibit 4-(2) to Form 8-K of Sonat
          Inc. dated June 6, 1995
   4.5    Specimen Note of Sonat Inc. for the $100 million 9 1/2%
          Notes due August 15, 1999, issued under Registration
          Statement No. 33-5947, filed as Exhibit 4-2(c) to Form 10-K
          of Sonat Inc. for the year 1996
   4.6    Specimen Note of Sonat Inc. for the $100 million 9% Notes
          due May 1, 2001, issued under Registration Statement No.
          33-5947, filed as Exhibit 4-(2) to Form 8-K of Sonat Inc.
          dated April 30, 1991
   4.7    Specimen Note of Sonat Inc. for the $100 million 6.75% Notes
          due October 1, 2007, issued under Registration Statement No.
          33-62166, filed as Exhibit 4-(3) to Form 8-K of Sonat Inc.
          dated September 25, 1997
   4.8    Specimen Note of Sonat Inc. for the $100 million 6 5/8%
          Notes due February 1, 2008, issued under Registration
          Statement No. 33-62166, filed as Exhibit 4-(3) to Form 8-K
          of Sonat Inc. dated January 27, 1998
   4.9    Specimen Note of Sonat Inc. for the $100 million 7% Notes
          due February 1, 2018, issued under Registration Statement
          No. 33-62166, filed as Exhibit 4-(3) to Form 8-K of Sonat
          Inc. dated January 29, 1998
   4.10   Form of Indenture dated June 1, 1987, from Southern Natural
          Gas Company to Manufacturers Hanover Trust Company, Trustee,
          as amended by (1) First Supplemental Indenture, dated as of
          September 30, 1997, between Southern Natural Gas Company and
          The Chase Manhattan Bank (formerly Chemical Bank, successor
          by merger to Manufacturers Hanover Trust Company), filed as
          Exhibit 4-(1) to Registration No. 33-47266 of Southern
          Natural Gas Company dated April 16, 1992, except (1) which
          was filed as Exhibit 4-(2) to Form 8-K of Southern Natural
          Gas Company dated September 25, 1997
   4.11   Specimen Note of Southern Natural Gas Company for the $100
          million 8 7/8% Notes due February 15, 2001, issued under
          Registration Statement 33-16190, filed as Exhibit 4-(2) to
          Form 8-K of Southern Natural Gas Company dated February 7,
          1991
   4.12   Specimen Note of Southern Natural Gas Company for the $100
          million 7.85% Notes due January 15, 2002, issued under
          Registration Statement 33-16190, filed as Exhibit 4-(2) to
          Form 8-K of Southern Natural Gas Company dated January 14,
          1992
   4.13   Specimen Note of Southern Natural Gas Company for the $100
          million 8 5/8% Notes due May 1, 2002, issued under
          Registration Statement 33-47266, filed as Exhibit 4.3(d) to
          Form 10-K of Sonat Inc. for the year 1996
   4.14   Specimen Note of Southern Natural Gas Company for the $100
          million 6.70% Notes due October 1, 2007, issued under
          Registration Statement 33-47266, filed as Exhibit 4-(3) to
          Form 8-K of Southern Natural Gas Company dated September 25,
          1997
</TABLE>
 
                                      IV-2
<PAGE>   80
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                              EXHIBITS
- -------                             --------
<C>       <S>
   4.15   $400 Million Note Agreement dated November 3, 1986, between
          Citrus Corp. and the Purchasers named therein, filed as
          Exhibit 4-(5) to Form 10-K of Sonat Inc. for the year 1990
   4.16   Credit Agreement dated as of June 1, 1996, among Sonat Inc.,
          the Banks named therein, and The Chase Manhattan Bank
          (National Association), and Morgan Guaranty Trust Company of
          New York, as Co-Agents, filed as Exhibit 4 to Form 10-Q of
          Sonat Inc. for the quarter ended June 30, 1996
   4.17   Credit Agreement dated as of January 26, 1998, among Sonat
          Inc., the Banks named therein, and The Chase Manhattan Bank,
          Morgan Guaranty Trust Company of New York, and SunTrust
          Bank, Atlanta, as Agents, filed herewith
   4.18   Certificate of Designations of Series A Participating
          Preference Stock of Sonat Inc. dated January 8, 1996, as
          filed with the Secretary of State of the State of Delaware
          January 16, 1996, filed as Exhibit 4.6 to Form 10-K of Sonat
          Inc. for the year 1995
 
                        COMPENSATION PLANS AND MANAGEMENT CONTRACTS
  10.1    Supplemental Benefit Plan of Sonat Inc. as Amended and
          Restated effective January 1, 1995, and (1) amendment dated
          December 1, 1995, filed as Exhibit 10.1 to Form 10-K of
          Sonat Inc. for the year 1996
  10.2    Executive Award Plan of Sonat Inc. as Amended and Restated
          as of December 1, 1995, (corrected on December 4, 1996), and
          (1) amendment dated December 6, 1996, filed as Exhibit 10.2
          to Form 10-K of Sonat Inc. for the year 1996
  10.3    Restricted Stock Plan for Directors of Sonat Inc. (as
          Amended and Restated as of February 26, 1998), filed
          herewith
  10.4    Performance Award Plan of Sonat Inc. effective as of January
          27, 1994, and (1) amendment dated December 1, 1995, filed as
          Exhibit 10-(7) to Form 10-K of Sonat Inc. for the year 1993,
          except (1), which was filed as Exhibit 10.7 to Form 10-K of
          Sonat Inc. for the year 1995
  10.5    Cash Bonus Plan of Sonat Inc. effective as of January 27,
          1994, and (1) amendment dated December 1, 1995, filed as
          Exhibit 10-(8) to Form 10-K of Sonat Inc. for the year 1993,
          except (1), which was filed as Exhibit 10.8.to Form 10-K of
          Sonat Inc. for the year 1995
  10.6    Sonat Inc. Retirement Plan for Directors as Amended and
          Restated as of December 2, 1994, and (1) amendment dated
          December 1, 1995, filed as Exhibit 10.9 to Form 10-K of
          Sonat Inc. for the year 1994, except (1), which was filed as
          Exhibit 10.9 to Form 10-K of Sonat Inc. for the year 1995
  10.7    Executive Severance Agreement dated December 1, 1995,
          between Sonat Inc. and William A. Smith and schedule
          identifying substantially identical Executive Severance
          Agreements between Sonat Inc. and other parties, filed
          herewith
  10.8    Executive Severance Agreement as amended and restated as of
          January 22, 1998, between Sonat Inc. and Ronald L. Kuehn,
          Jr., filed herewith
  10.9    Executive Severance Agreement as amended and restated as of
          January 22, 1998, between Sonat Inc. and Donald G. Russell,
          filed herewith
  10.10   Directors' Fees Deferral Plan of Sonat Inc. as Amended and
          Restated as of January 1, 1997, filed herewith
</TABLE>
 
                                      IV-3
<PAGE>   81
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                              EXHIBITS
- -------                             --------
<C>       <S>
  10.11   Indemnity Agreement dated December 4, 1987, between Sonat
          Inc. and Ronald L. Kuehn, Jr. and schedule identifying
          substantially identical indemnity agreements between Sonat
          Inc. and other directors of Sonat Inc. and (1) Indemnity
          Agreement dated September 1, 1994, between Sonat Inc. and
          Adrian M. Tocklin, (2) Indemnity Agreement dated September
          22, 1994, between Sonat Inc. and Donald G. Russell, (3)
          Indemnity Agreement dated November 1, 1995, between Sonat
          Inc. and Max L. Lukens, (4) Indemnity Agreement dated
          January 30, 1998, between Sonat Inc. and Michael S. Zilkha,
          and (5) Indemnity Agreement dated January 30, 1998, between
          Sonat Inc. and Selim K. Zilkha, filed as Exhibit 10-(11) to
          Form 10-K of Sonat Inc. for the year 1992, except (1), which
          was filed as Exhibit 10.3 to Form 10-Q of Sonat Inc. for the
          quarter ended September 30, 1994, (2), which was filed as
          Exhibit 10.4 to Form 10-Q of Sonat Inc. for the quarter
          ended September 30, 1994, (3), which was filed as Exhibit
          10.12 to Form 10-K of Sonat Inc. for the year 1995, and (4)
          and (5) which are filed herewith
  10.12   Trust Agreement dated December 19, 1986, between Sonat Inc.
          and AmSouth Bank N.A. for Section 415 Retirement Plan
          Benefits and Vesting Benefits under the Supplemental Benefit
          Plan and Early Retirement Benefits under the Executive
          Severance Agreements, filed as Exhibit 10-(5) to Form 10-K
          of Sonat Inc. for the year 1991
  10.13   Trust Agreement dated December 19, 1986, between Sonat Inc.
          and AmSouth Bank N.A. for Section 415 Stock Purchase Plan
          Benefits under the Supplemental Benefit Plan, filed as
          Exhibit 10-(16) to Form 10-K of Sonat Inc. for the year 1991
  10.14   Trust Agreement dated December 19, 1986, between Sonat Inc.
          and AmSouth Bank N.A. for Benefits under the Retirement Plan
          for Directors, filed as Exhibit 10-(17) to Form 10-K of
          Sonat Inc. for the year 1991
  10.15   Form of Sonat Inc. Executive Life Insurance Program Split
          Dollar Agreement, Collateral Assignment Agreement, and
          Program Description, each dated as of July 1, 1990, with (1)
          schedule identifying the persons participating in such
          Programs, filed as Exhibit 10-(20) to Form 10-K of Sonat
          Inc. for the year 1990, except (1), which is filed herewith
  10.16   Sonat Inc. Deferred Compensation Plan -- Plan Summary dated
          November 1997, filed herewith
 
                                           OTHER MATERIAL CONTRACTS
  10.17   Capital Stock Agreement among Sonat Inc., Enron Corp.,
          Houston Natural Gas Corporation, and Citrus Corp. dated June
          30, 1986, filed as Exhibit 10-(26) to Form 10-K of Sonat
          Inc. for the year 1991
  10.18   Standby Note Purchase Agreement among Sonat Inc., Credit
          Lyonnais New York Branch, as Administrative Agent for the
          Banks party to the Revolving Credit Agreement with Citrus
          Corp., and Citrus Corp. dated December 23, 1993, and the
          $300 Million Revolving Credit Agreement dated as of December
          23, 1993, among Citrus Corp., as Borrower, and The Banks
          named therein, as Banks, and Credit Lyonnais New York Branch
          and The Toronto-Dominion Bank, as Managing Agents, to which
          the Standby Note Purchase Agreement applies, filed as
          Exhibit 10-(23) to Form 10-K of Sonat Inc. for the year 1993
 OTHER EXHIBITS
  12      Computation of Ratio of Earnings to Fixed Charges, filed
          herewith
  21      Subsidiaries of Sonat Inc., filed herewith
  22      Proxy Statement of Sonat Inc. dated as of March 21, 1998
          which is not to be deemed "filed" as part of this Form 10-K,
          except to the extent incorporated by reference under Items
          10, 11, 12 and 13 of Part III of this Form 10-K, filed
          herewith
  23.1    Consent of Ernst & Young LLP, Independent Auditors, dated
          March 23, 1998, filed herewith
  23.2    Consent of William M. Cobb & Associates, Inc., Independent
          Petroleum Engineers, dated March 23, 1998, filed herewith.
</TABLE>
 
                                      IV-4
<PAGE>   82
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                              EXHIBITS
- -------                             --------
<C>       <S>
  24      Powers of Attorney authorizing Ronald L. Kuehn, Jr.; Thomas
          W. Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and
          John C. Griffin to sign the Sonat Inc. Annual Report on Form
          10-K for the fiscal year ended December 31, 1997, on behalf
          of certain directors and officers of the registrant, filed
          herewith
  27.1    Financial Data Schedule for the period ended December 31,
          1997, filed herewith, electronically only
  27.2    Financial Data Schedule for the period ended December 31,
          1996, filed herewith, electronically only
  27.3    Financial Data Schedule for the period ended December 31,
          1995, filed herewith, electronically only
</TABLE>
 
     Exhibits listed above that have heretofore been filed with the Securities
and Exchange Commission, which were physically filed as noted above, are hereby
incorporated herein by reference pursuant to Rule 12b-32 under the Securities
Exchange Act of 1934 and made a part hereof with the same effect as if filed
herewith.
 
     Certain instruments relating to long-term debt of Sonat and its
subsidiaries have not been filed as exhibits since the total amount of
securities authorized under any such instrument does not exceed ten percent of
the total assets of Sonat and its subsidiaries on a consolidated basis. Sonat
agrees to furnish a copy of each such instrument to the Commission upon request.
 
     (b) Reports on Form 8-K
 
     The Company filed a report on Form 8-K on November 24, 1997, reporting
certain information under Item 5 with respect to the Agreement and Plan of
Merger between Sonat Inc. and Zilkha Energy Company pursuant to which a wholly
owned subsidiary of the Company would merger into Zilkha Energy Company in a
share-for-share exchange and furnishing certain related exhibits under Item 7
 
     The Company filed a report on Form 8-K on January 22, 1998, reporting
certain information under Item 5 with respect to the issuance of the Company's
press release relating to its 1997 results of operations
 
     The Company filed a report on Form 8-K on January 30, 1998, reporting
certain information under Item 5 with respect to the issuance and sale by the
Company of $100,000,000 aggregate principal amount of 6 5/8% Notes due February
1, 2008 and furnishing certain related exhibits under Item 7
 
     The Company filed a report on Form 8-K on February 2, 1998, reporting
certain information under Item 5 with respect to the issuance and sale by the
Company of $100,000,000 aggregate principal amount of 7% Notes due February 1,
2018 and furnishing certain related exhibits under Item 7
 
     The Company filed a report on Form 8-K on February 5, 1998, reporting
certain information under Item 5 with respect to the acquisition and disposition
of assets and furnishing certain related exhibits under Item 7
 
     (c) Exhibits
 
     Exhibits required by Item 601 of Regulation S-K have been filed
electronically with this report on Form 10-K.
 
                                      IV-5
<PAGE>   83
 
                                   SIGNATURES
 
     PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(D) 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.
 
                                          SONAT INC.
 
                                          By:   /s/ RONALD L. KUEHN, JR.
                                            ------------------------------------
                                                    RONALD L. KUEHN, JR.
                                                   CHAIRMAN OF THE BOARD,
                                               PRESIDENT AND CHIEF EXECUTIVE
                                                           OFFICER
 
Dated: March 26, 1998
 
     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 DATES INDICATED.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                   CAPACITY                   DATE
                      ---------                                   --------                   ----
<C>                                                    <S>                              <C>
(i) Principal Executive Officer:
 
              /s/ RONALD L. KUEHN, JR.                 Chairman of the Board,           March 26, 1998
- -----------------------------------------------------    President and Chief Executive
               (RONALD L. KUEHN, JR.)                    Officer
 
(ii) Principal Financial and Accounting Officer:
 
              /s/ JAMES E. MOYLAN, JR.                 Senior Vice President and Chief  March 26, 1998
- -----------------------------------------------------    Financial Officer
               (JAMES E. MOYLAN, JR.)
 
(iii) Directors:*
 
      WILLIAM O. BOURKE                                  JEROME J. RICHARDSON
      RONALD L. KUEHN, JR.                               DONALD G. RUSSELL
      ROBERT J. LANIGAN                                  ADRIAN M. TOCKLIN
      MAX L. LUKENS                                      JAMES B. WILLIAMS
      CHARLES MARSHALL                                   JOE B. WYATT
      BENJAMIN F. PAYTON                                 MICHAEL S. ZILKHA
      JOHN J. PHELAN, JR.                                SELIM K. ZILKHA
 
* Signed on behalf of each of these persons and on his behalf:
 
By:               /s/ WILLIAM A. SMITH
   --------------------------------------------------
   WILLIAM A. SMITH
   EXECUTIVE VICE PRESIDENT AND GENERAL COUNSEL AS
   AUTHORIZED BY CERTAIN POWERS OF ATTORNEY DATED
   FEBRUARY 26 AND 28, 1998, ALL OF WHICH ARE FILED
               HEREWITH AS EXHIBIT 24
</TABLE>
 
                                      IV-6
<PAGE>   84


                          CITRUS CORP. AND SUBSIDIARIES

                                TABLE OF CONTENTS




<TABLE>
<CAPTION>
REPORT OF INDEPENDENT AUDITORS                                                              PAGE NO.
- ------------------------------                                                              --------
<S>                                                                                         <C>
   Report of Independent Auditors                                                             IV-8

AUDITED CONSOLIDATED FINANCIAL STATEMENTS
- -----------------------------------------

   Consolidated Balance Sheets - Assets                                                       IV-9
   Consolidated Balance Sheets - Liabilities and Stockholders' Equity                         IV-10
   Consolidated Statements of  Income and Retained Earnings                                   IV-11
   Consolidated Statements of Cash Flows                                                      IV-12
   Notes to Consolidated Financial Statements                                                 IV-13
</TABLE>


                                      IV-7

<PAGE>   85


                         Report of Independent Auditors


Board of Directors
Citrus Corp.

We have audited the accompanying consolidated balance sheets of Citrus Corp. and
Subsidiaries as of December 31, 1997 and 1996, and the related consolidated
statements of income and retained earnings and cash flows for each of the three
years in the period ended December 31, 1997. These financial statements are the
responsibility of the Company'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 consolidated financial position of Citrus Corp. and
Subsidiaries at December 31, 1997 and 1996, and the consolidated results of
their operations and their cash flows for each of the three years in the period
ended December 31, 1997, in conformity with generally accepted accounting
principles.

                                    /s/ Ernst & Young LLP

                                    Ernst & Young LLP



Birmingham, Alabama
February 27, 1998


                                      IV-8


<PAGE>   86


                          CITRUS CORP. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS



<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------
                                                                       December  31,
                                                               --------------------------
(In Thousands)                                                    1997            1996
- -----------------------------------------------------------------------------------------
<S>                                                            <C>             <C>       
ASSETS
     Current Assets
         Cash and cash equivalents                             $   17,274      $   16,063

         Trade and other receivables
              Customers, net                                       43,724          69,599
              Affiliated companies                                     28              98

         Contract reformation costs, net                               --           7,078

         Commodity adjustment costs                                 5,399           5,519

         Materials and supplies                                     2,730           2,557

         Other                                                     11,582           6,200
                                                               --------------------------

              Total Current Assets                                 80,737         107,114
                                                               --------------------------

     Deferred Charges
         Unamortized debt expense                                   6,241           7,356
         Commodity adjustment costs                                29,419          34,698
         Other                                                     32,011          42,847
                                                               --------------------------

              Total Deferred Charges                               67,671          84,901
                                                               --------------------------

     Property, Plant and Equipment, at cost                     2,810,061       2,790,210
         Less - accumulated depreciation and amortization         463,938         428,172
                                                               --------------------------

              Net Property, Plant and Equipment                 2,346,123       2,362,038
                                                               --------------------------

TOTAL ASSETS                                                   $2,494,531      $2,554,053
</TABLE>


- --------------------------------------------------------------------------------

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


                                      IV-9

<PAGE>   87


                          CITRUS CORP. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS


<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------
                                                               December  31,
                                                        --------------------------
(In Thousands, Except Share Data)                           1997            1996
- ----------------------------------------------------------------------------------
<S>                                                     <C>             <C>       
LIABILITIES AND STOCKHOLDERS' EQUITY
     Current Liabilities

         Notes payable to banks                         $   20,000      $   15,000

         Long-term debt due within one year                 44,250         100,000

         Accounts payable
              Trade                                         26,650          29,351
              Affiliated companies                          13,857          28,920

         Accrued liabilities
              Interest                                      16,996          18,296
              Other taxes                                    6,662           4,695

         TCR deferred revenues                                  --           6,256

         Other                                               5,066           8,710
                                                        --------------------------

              Total Current Liabilities                    133,481         211,228
                                                        --------------------------

     Long-Term Debt                                        980,750       1,025,000
                                                        --------------------------

     Deferred Credits
         Deferred income taxes                             483,190         474,569
         Other                                              32,784          33,516
                                                        --------------------------

              Total Deferred Credits                       515,974         508,085
                                                        --------------------------

     Commitments and Contingencies (Notes 8 and 9)

     Stockholders' Equity
         Common stock, $1 par value; 1,000 shares
              authorized, issued and outstanding                 1               1
         Additional paid-in capital                        634,271         634,271
         Retained earnings                                 230,054         175,468
                                                        --------------------------

              Total Stockholders' Equity                   864,326         809,740
                                                        --------------------------

TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY              $2,494,531      $2,544,053
</TABLE>

- --------------------------------------------------------------------------------

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

                                       IV-10

<PAGE>   88

                          CITRUS CORP. AND SUBSIDIARIES
             CONSOLIDATED STATEMENTS OF INCOME AND RETAINED EARNINGS



<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------
                                                                Years Ended December 31,
                                                       -----------------------------------------
(In Thousands)                                            1997            1996           1995
- ------------------------------------------------------------------------------------------------
<S>                                                    <C>             <C>             <C>      
Revenues
     Gas sales                                         $ 426,559       $ 444,623       $ 377,218
     Gas transportation and other, net                   308,843         324,712         305,169
                                                       -----------------------------------------


                                                         735,402         769,335         682,387
                                                       -----------------------------------------

Costs and Expenses
     Natural gas purchased                               416,953         428,842         362,635
     Operations and maintenance                           82,653          74,413          79,880
     Depreciation                                         26,103          26,651          22,850
     Amortization                                         34,367          56,912          58,377
     Taxes - other than income taxes                      24,717          20,160          14,767
                                                       -----------------------------------------

                                                         584,793         606,978         538,509
                                                       -----------------------------------------

Operating Income                                         150,609         162,357         143,878
                                                       -----------------------------------------

Other Income (Expense)
     Interest expense, net                               (93,471)        (97,363)        (98,887)
     Allowance for funds used during construction            599            (153)         42,804
     Other, net                                           14,309           5,437            (351)
                                                       -----------------------------------------

                                                         (78,563)        (92,079)        (56,434)
                                                       -----------------------------------------

Income Before Income Taxes                                72,046          70,278          87,444

Income Tax Expense                                        17,460          27,240          33,818
                                                       -----------------------------------------

Net Income                                                54,586          43,038          53,626

Retained Earnings, Beginning of Year                     175,468         132,430          78,804
                                                       -----------------------------------------

Retained Earnings, End of Year                         $ 230,054       $ 175,468       $ 132,430
</TABLE>

- -------------------------------------------------------------------------------

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


                                      IV-11


<PAGE>   89


                          CITRUS CORP. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS


<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
                                                                    Years Ended December 31,
                                                           -----------------------------------------
(In Thousands)                                                1997            1996           1995
- ----------------------------------------------------------------------------------------------------
<S>                                                        <C>             <C>             <C>      
Cash Flows From Operating Activities

     Net income                                            $  54,586       $  43,038       $  53,626

     Adjustments to reconcile net income to net
     cash provided by (used in) operating activities
         Depreciation and amortization                        60,470          83,563          81,227
         Deferred income taxes                                 8,621           8,539          21,780
         Allowance for funds used during construction           (599)            153         (42,804)
         Gain on sale of assets                                 (504)         (7,387)             --

     Changes in assets and liabilities
         Trade and other receivables                          25,945          (6,963)        (16,301)
         Materials and supplies                                 (173)           (178)           (424)
         Accounts payable                                    (17,764)          7,380         (12,199)
         Accrued liabilities                                     667            (543)         (1,005)
         Other current assets and liabilities                 (9,026)         (2,547)        (12,639)

     Contract reformation settlements and adjustments         (1,826)         (4,931)         (3,917)
     Other, net                                               12,244          (2,225)        (18,587)
                                                           -----------------------------------------

Net Cash Provided by Operating Activities                    132,641         117,899          48,757
                                                           -----------------------------------------

Cash Flows From Investing Activities
     Additions to property, plant and equipment              (31,261)        (29,000)       (208,627)
     Allowance for funds used during construction                599            (153)         42,804
     Net proceeds from sale of assets                            504           7,387              --
Disposition of property, plant and equipment, net                (16)          3,081             883
                                                           -----------------------------------------

Net Cash Used in Investing Activities                        (30,174)        (18,685)       (164,940)
                                                           -----------------------------------------

Cash Flows From Financing Activities
     Short-term bank borrowings, net                           5,000         (55,000)         70,000
     Payment on long-term debt                              (100,000)             --              --
     TCR remittances                                          (6,256)        (31,136)        (28,900)
                                                           -----------------------------------------

Net Cash Provided by (Used in) Financing Activities         (101,256)        (86,136)        (41,100)
                                                           -----------------------------------------

Increase (Decrease) in Cash and Cash Equivalents               1,211          13,078         (75,083)

Cash and Cash Equivalents, Beginning of Year                  16,063           2,985          78,068
                                                           -----------------------------------------

Cash and Cash Equivalents, End of Year                     $  17,274       $  16,063       $   2,985
</TABLE>

- --------------------------------------------------------------------------------


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

Additional cash flow information:
The Company made the following interest and income tax payments:

<TABLE>
        <S>                                             <C>             <C>             <C>     
        Interest paid                                   $ 103,363       $ 106,206       $ 106,224
        Income taxes paid                                   9,708          20,766          14,160
</TABLE>


                                      IV-12

<PAGE>   90


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(1)      REPORTING ENTITY

                  Citrus Corp. (the Company), a holding company formed in 1986,
         owns 100% of the stock of Florida Gas Transmission Company
         (Transmission), Citrus Trading Corp. (Trading) and Citrus Energy
         Services, Inc. (CESI). The stock of the Company is owned 50% by Sonat
         Inc. (Sonat) and 50% by Houston Pipe Line Company, a subsidiary of
         Enron Corp. (Enron).

                  Transmission, an interstate gas pipeline extending from South
         Texas to South Florida, is engaged in the interstate transmission of
         natural gas and is subject to the jurisdiction of the Federal Energy
         Regulatory Commission (FERC).

                  Trading is engaged in the sale of natural gas primarily to
         Florida Power & Light Co., a large electric utility in the state of
         Florida, to local distribution customers, and to end users, the
         majority of which are in the state of Florida.

                  CESI began operations in February 1996 and provides
         construction, operations and maintenance services primarily to
         customers of Transmission and Trading.


(2)      SIGNIFICANT ACCOUNTING POLICIES

                  PRINCIPLES OF CONSOLIDATION - The consolidated financial
         statements include the accounts of the Company and its subsidiaries.
         All significant intercompany transactions and accounts have been
         eliminated in consolidation.

                  CASH AND CASH EQUIVALENTS - The Company considers as cash
         equivalents all highly liquid short-term investments with maturities of
         three months or less at the time of purchase. These investments are
         accounted for at cost, which approximates estimated fair value.

                  MATERIALS AND SUPPLIES - Materials and supplies are valued at
         actual cost. Materials transferred out of warehouses are priced out at
         average cost.

                  REVENUE RECOGNITION - Gas sales revenue is recognized when gas
         is sold. Gas transportation revenue is recognized when the service is
         provided.

                  ACCOUNTING FOR PRICE RISK MANAGEMENT ACTIVITIES - To manage
         the risks of price fluctuations, Trading, from time to time, has
         entered into swap agreements in certain energy products. All related
         gains and losses are recognized currently in income as adjustments to
         costs and expenses. Trading uses the settlement method of accounting
         for its commodity swaps. Commodity swaps are settled monthly and gains
         and losses are recognized immediately. The effects of commodity swaps,
         none of which has been material for any of the periods presented, are
         recorded as an adjustment to natural gas purchased.

                  ALLOWANCE FOR FUNDS USED DURING CONSTRUCTION - The allowance
         for funds used during construction consists, in general, of the net
         cost of borrowed and equity funds used for construction purposes and a
         reasonable rate on other funds when so used (the AFUDC rate). The
         allowance is determined by applying the AFUDC rate to construction work
         orders. Capitalization begins at the time the Company begins the
         continuous accumulation of costs in a construction work order on a
         planned progressive basis and ends when the facilities are placed in
         service.


                                     IV-13


<PAGE>   91


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(2)      SIGNIFICANT ACCOUNTING POLICIES  (continued)

                  DEPRECIATION, AMORTIZATION AND MAINTENANCE POLICIES - The
         Company amortizes that portion of its investment in Transmission and
         other subsidiaries which is in excess of historical cost (acquisition
         adjustment) on a straight-line basis at an annual rate of 1.9% based
         upon the estimated remaining useful life of the pipeline system.
         Transmission has provided for depreciation of assets on a straight-line
         basis at an annual composite rate of 1.42%, 1.45% and 1.41% for 1997,
         1996 and 1995, respectively. Depreciation rates are based on the
         estimated useful lives of the individual assets.

                  In 1994, Trading entered into an agreement with a major
         customer, which provides significant future benefits over previous gas
         sales contracts. The agreement required Trading to make approximately
         $55 million in deposits on the customers' behalf over sixteen months.
         Trading is amortizing the total amounts paid on a volumetric basis over
         the term of the new agreement. Amortization of these payments is
         included in depreciation and amortization expense.

                  Transmission amortizes contract reformation costs based on
         firm contract quantities and volume deliveries, and FERC-approved
         recovery rates. Such amortization is included in depreciation and
         amortization expense.

                  Transmission charges to maintenance the costs of repairs and
         renewal of items determined to be less than units of property. Costs of
         replacements and renewals of units of property are capitalized. The
         original costs of units of property retired are charged to the
         depreciation reserves, net of salvage and removal costs.

                  INCOME TAXES - The Company accounts for income taxes under the
         provisions of Statement of Financial Accounting Standards (SFAS) No.
         109. SFAS No. 109 provides for an asset and liability approach to
         accounting for income taxes. Under this approach, deferred tax assets
         and liabilities are recognized based on anticipated future tax
         consequences attributable to differences between financial statement
         carrying amounts of assets and liabilities and their respective tax
         bases.

                  USE OF ESTIMATES - The preparation of financial statements in
         conformity with generally accepted accounting principles requires
         management to make estimates and assumptions that affect the amounts
         reported in the financial statements and accompanying notes. Actual
         results could differ from those estimates.

                  IMPAIRMENT OF LONG-LIVED ASSETS - In March 1995, the Financial
         Accounting Standards Board issued SFAS No. 121 - "Accounting for the
         Impairment of Long-Lived Assets and for Long-Lived Assets to be
         Disposed Of," which requires, among other things, that long-lived
         assets and certain identifiable intangibles to be held and used by an
         entity be reviewed for impairment whenever events or changes in
         circumstances indicate that the carrying amount of an asset may not be
         recoverable. The Company's adoption of SFAS No. 121 in 1996 did not
         have a material impact on its financial position or results of
         operations.

                  RECLASSIFICATIONS - Certain amounts in the consolidated
         financial statements have been reclassified in 1996 and 1995 to conform
         with the 1997 presentation.

                                     IV-14


<PAGE>   92


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(3)      LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS

                  Long-term debt outstanding at December 31, 1997 and 1996 was
         as follows (in thousands):

<TABLE>
<CAPTION>
                                                1997            1996
                                             ----------      ----------
<C>                                          <C>             <C>       
Citrus Corp. 
  11.10% Notes due 1998-2006                 $  175,000      $  175,000
  8.49% Notes due 2007-2009                      90,000          90,000
                                             ----------      ----------
                                                265,000         265,000
                                             ----------      ----------
Transmission
  7.75% Notes                                        --         100,000
  9.30% Notes due 1998                           25,000          25,000
  8.14% Notes due 1999                          200,000         200,000
  9.75% Notes due 1999-2008                      65,000          65,000
  8.63% Notes due 2004                          250,000         250,000
  10.11% Notes due 2009-2013                     70,000          70,000
  9.19% Notes due 2005-2024                     150,000         150,000
                                             ----------      ----------
                                                760,000         860,000
                                             ----------      ----------

Total Outstanding                             1,025,000       1,125,000
Less Long-Term Debt Due Within One Year          44,250         100,000
                                             ----------      ----------
                                             $  980,750      $1,025,000
                                             ==========      ==========
</TABLE>

                  Annual maturities and sinking fund requirements on long-term
         debt outstanding as of December 31, 1997 were as follows (in
         thousands):

<TABLE>
<CAPTION>
                  Year                                         Amount
                  ----                                      ----------
                  <S>                                       <C>       
                  1998                                      $   44,250
                  1999                                         225,750
                  2000                                          25,750
                  2001                                          25,750
                  2002                                          25,750
                  Thereafter                                   677,750
                                                            ----------
                                                            $1,025,000
                                                            ==========
</TABLE>

                  The Company has a note agreement that contains certain
         restrictions, which among other things limit the incurrence of
         additional debt, the sale of assets and the payment of dividends. The
         agreements relating to Transmission's promissory notes include, among
         other things, restrictions as to the payment of dividends.

                  The Company had no committed lines of credit at December 31,
         1997. Transmission has a committed line of credit of $70.0 million of
         which $20.0 million was outstanding with a rate of 6.30% at December
         31, 1997, and uncommitted facilities for up to $50.0 million, which
         were available at December 31, 1997.


                                     IV-15


<PAGE>   93


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(4)      INCOME TAXES

         The principal components of the Company's net deferred income tax
         liabilities at December 31, 1997 and 1996 are as follows (in
         thousands):

<TABLE>
<CAPTION>
                                           1997          1996
                                         --------      --------
<S>                                      <C>           <C>     
Deferred income tax assets
   Alternative minimum tax credit        $ 20,360      $ 14,824
   Other                                    5,588         9,510
                                         --------      --------
                                           25,948        24,334
                                         --------      --------

Deferred income tax liabilities
  Depreciation and amortization           492,629       478,506
  Contract reformation costs               13,167        15,211
  Other                                     3,342         5,186
                                         --------      --------
                                          509,138       498,903
                                         --------      --------

Net deferred income tax liabilities      $483,190      $474,569
                                         ========      ========
</TABLE>

                  Total income tax expense for the years ended December 31,
         1997, 1996 and 1995 is summarized as follows (in thousands):

<TABLE>
<CAPTION>
                                1997          1996         1995
                              --------       -------      -------
<S>                           <C>            <C>          <C>    
Payable currently
  Federal                     $  6,441       $15,445      $10,138
  State                          2,398         3,256        1,900
                              --------       -------      -------
                                 8,839        18,701       12,038
                              --------       -------      -------
Payment deferred
  Federal                       23,300         7,847       18,867
  State                        (14,679)          692        2,913
                              --------       -------      -------
                                 8,621         8,539       21,780
                              --------       -------      -------

Total income tax expense      $ 17,460       $27,240      $33,818
                              ========       =======      =======
</TABLE>

                  The 1997 income tax provision includes benefits of
         approximately $10 million from the reduction of the deferred income tax
         liability due to the reevaluation of state tax requirements.

                  The differences between taxes computed at the U.S. federal
         statutory rate and the Company's effective tax rate for the years ended
         December 31, 1997, 1996 and 1995 are as follows (in thousands):

<TABLE>
<CAPTION>
                                              1997          1996         1995
                                            --------       -------      -------
<S>                                         <C>            <C>          <C>    
Statutory federal income tax provision      $ 25,216       $24,597      $30,605
Net state income taxes                        (7,983)        2,566        3,128
Other                                            227            77           85
                                            --------       -------      -------

Income tax expense                          $ 17,460       $27,240      $33,818
                                            ========       =======      =======
</TABLE>

                  The Company has an alternative minimum tax (AMT) credit, which
         can be used to offset regular income taxes payable in future years. The
         AMT credit has an indefinite carry-forward period. For financial
         statement purposes, the Company has recognized the benefit of the AMT
         credit carry-forward as a reduction of deferred tax liabilities.


                                     IV-16

<PAGE>   94


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(5)      EMPLOYEE BENEFIT PLANS

                  The employees of the Company and its subsidiaries are covered
         under Enron's employee benefit plans. Enron maintains a retirement plan
         (the Enron Plan) which is a noncontributory defined benefit plan
         covering substantially all employees in the United States and certain
         employees in foreign countries. The benefit accrual is in the form of a
         cash balance of 5% of annual base pay beginning January 1, 1996. Prior
         to 1996, the benefit formula was based on average pay and years of
         service. Pension expenses charged by Enron were immaterial for 1997,
         1996 and 1995.

                  As of December 31, 1997, the plan net assets for the Enron
         Plan in which the employees of the Company participate was greater than
         the actuarial present value of projected plan benefit obligations by
         approximately $111 million. Included in this amount are assets from a
         defined benefit plan for an acquired company. The assumed discount rate
         was 7.25%. The rate of return on plan assets used in determining the
         actuarial present value of projected plan benefits was 9.0% to 10.5%.
         The assumed rate of increase in wages was 4.0% to 9.5%.

                  The Company accounts for post-retirement benefit costs over
         the service lives of the employees expected to be eligible to receive
         such benefits. The Company is amortizing the transition obligation,
         which existed at January 1, 1993, over a period of approximately 19
         years. The Company's net periodic post-retirement benefit cost charged
         by Enron was $1.4, $1.5 and $.9 million for 1997, 1996 and 1995,
         respectively, substantially all of which relates to Transmission and is
         expected to be recovered through rates. The measurement of the
         accumulated post-retirement benefit obligation (APBO) assumes a 7.25%
         discount rate and a health care cost trend rate of 7.5% to 8.0% in 1997
         decreasing to 5% by 2003. The APBO exceeded plan assets by $94 million
         as of its most recent valuation date of December 31, 1997.


(6)      MAJOR CUSTOMERS

         Revenues from individual customers exceeding 10% of total revenues for
         the years ended December 31, 1997, 1996 and 1995 were approximately as
         follows (in thousands):

<TABLE>
<CAPTION>
        Customers                        1997          1996          1995
        ---------                      --------      --------      --------
<S>                                    <C>           <C>           <C>     
Florida Power & Light Co.              $424,000      $466,000      $343,000
Enron Capital and Trade Resources        51,000        19,000        65,000
</TABLE>

                  At December 31, 1997, the Company's subsidiaries had
         receivables of approximately $19.8 and $6.9 million from Florida Power
         & Light Company and Enron Capital and Trade Resources, respectively.


                                     IV-17


<PAGE>   95


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(7)      RELATED PARTY TRANSACTIONS

                  The Company incurs certain corporate administrative expenses
         including employee benefit costs from Enron and its affiliates. The
         Company was charged approximately $11.8, $11.9 and $11.6 million for
         these expenses for the years ended December 31, 1997, 1996 and 1995,
         respectively.

                  The Company's subsidiaries provide natural gas sales and
         transport services to Enron and Sonat affiliates at rates equal to
         rates charged to non-affiliated customers in the same class of service.
         Revenues related to these services amounted to approximately $51.5,
         $19.8 and $66.1 million for the years ended December 31, 1997, 1996 and
         1995, respectively. The Company's subsidiaries purchased gas from
         affiliates of Sonat of approximately $121.8, $139.8 and $84.1 million
         for the years ended December 31, 1997, 1996 and 1995, respectively. The
         Company's subsidiaries also purchased gas from affiliates of Enron of
         approximately $219.1, $252.6 and $186.7 million for the years ended
         December 31, 1997, 1996 and 1995, respectively.

                  The Company had an agreement with an affiliate of Enron in
         which the affiliate managed the operations of Trading in exchange for a
         $1.2 million annual fee from November 1, 1993 to October 31, 1997.
         Effective November 1, 1997, the operations of the contracts held by
         Trading were divided between affiliates of Enron and Sonat.
         Additionally, the Enron affiliate made a payment of $20 million to
         Trading to compensate it for lost future business. The fee charged is
         now based on a volumetric payment of $.05/mmbtu, or approximately 50%
         of the prior arrangement. Under this agreement, Trading is guaranteed
         an earnings stream based on all firm long-term contracts in place at
         November 1, 1997.


(8)      RATE MATTERS

                  Transmission has been authorized by the FERC to recover
         certain transition costs incurred through the reformation of gas
         purchase contracts related to Transmission's former jurisdictional
         sales services. Transmission's Order No. 636 restructuring settlement,
         effective November 1, 1993, allows Transmission to recover 100% of any
         transition costs from $106 million up to $160 million, and 75% of
         payments exceeding $160 million. Transmission has no gas purchase
         contracts with accrued take-or-pay obligations, which have not yet been
         terminated. All transition costs eligible for recovery have been fully
         recovered.

                  On August 30, 1996, Transmission made a Section 4 rate filing
         in Docket No. RP96-366-000 proposing an increase in annual revenues of
         approximately $27.4 million for service on the pre-expansion system and
         approximately $8.2 million for service on the Phase III expansion
         system. In an order issued September 30, 1996, the FERC accepted and
         suspended the filing to be effective March 1, 1997, subject to refund
         and certain conditions. By order issued November 27, 1996, certain
         audit and investigation matters (see Note 9) were consolidated with the
         rate case. After several months of negotiations, a settlement was
         reached with Transmission's customers and FERC staff ("Rate Case
         Settlement"). The Rate Case Settlement, filed on August 5, 1997,
         provides for tiered rates which, for a two-year period, reflect an
         increase over the rates in effect prior to the rate filing for
         transportation through both the pre-expansion and Phase III expansion
         systems. FERC approved the Rate Case Settlement on September 24, 1997;
         compliance tariff sheets were filed on November 12, 1997 under which
         the first tier of the Settlement rates became effective retroactive to
         March 1, 1997.


                                      IV-18


<PAGE>   96


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(9)      COMMITMENTS AND CONTINGENCIES

                  The FERC's Division of Audits (DOA) completed a compliance
         review of Transmission's books and records for the period of January 1,
         1991 through December 31, 1994. Among other things, the FERC auditors
         questioned certain aspects of Transmission's procedures for accounting
         for the costs of financing Transmission's Phase III expansion
         facilities and proposed adjustments to the amount of AFUDC capitalized
         during construction of its Phase III expansion facilities. Pursuant to
         an agreement among Transmission, FERC staff and customer intervenors,
         Transmission filed a settlement agreement on July 30, 1996, which was
         approved by FERC order issued September 27, 1996. The settlement
         provided for a reduction of $18.75 million in its Gas Plant in Service
         account. In addition, the settlement provided that Transmission would
         restructure its capital accounts by removing approximately $348 million
         of excess donated capital on its books related to the Phase III
         construction. The settlement was without prejudice to Transmission
         seeking Commission approval to recover the $18.75 million, required to
         be removed from its plant account, in the rate case filed by
         Transmission on August 30, 1996. As a result of the Rate Case
         Settlement, Transmission will amortize the $18.75 million over a period
         not to exceed fifty-five months commencing March 1, 1997. The $18.75
         million will be recovered over the amortization period.

                  The DOA conducted a review of Transmission's books and records
         as to the construction costs of the Phase III expansion. The FERC's
         Division of Enforcement (DOE) conducted an informal investigation as to
         the possible non-compliance with certain environmental conditions
         attached to the FERC certificate authorizing the Phase III expansion.
         By order issued November 27, 1996, the FERC consolidated the Phase III
         cost audit and the DOE informal investigation with Transmission's rate
         case in Docket No. RP96-366-000. Pursuant to the Rate Case Settlement,
         the DOA review and DOE investigations have been terminated with no
         disallowance of any Phase III project costs.

(10)     CONCENTRATIONS OF CREDIT RISK AND OTHER FINANCIAL INSTRUMENTS

                  The Company and its subsidiaries have a concentration of
         customers in the electric and gas utility industries. These
         concentrations of customers may impact the Company's overall exposure
         to credit risk, either positively or negatively, in that the customers
         may be similarly affected by changes in economic or other conditions.
         Credit losses incurred on receivables in these industries compare
         favorably to losses experienced in the Company's receivable portfolio
         as a whole. The Company and its subsidiaries also have a concentration
         of customers located in the southeastern United States, primarily
         within the state of Florida. Receivables are generally not
         collateralized. The Company's management believes that the portfolio of
         receivables, which includes local distribution companies and
         municipalities, is well diversified and that such diversification
         minimizes any potential credit risk.

                  The carrying amounts and fair value of the Company's financial
         instruments at December 31, 1997 and 1996 are as follows (in
         thousands):

<TABLE>
<CAPTION>
                                                1997                            1996
                                     --------------------------      --------------------------
                                      Carrying        Estimated       Carrying        Estimated
                                       Amount        Fair Value        Amount        Fair Value
                                     ----------      ----------      ----------      ----------
<S>                                  <C>             <C>             <C>             <C>       
Cash and cash equivalents            $   17,274      $   17,274      $   16,063      $   16,063
Contract reformation costs, net              --              --           7,078           7,078
TCR deferred revenues                        --              --           6,256           6,256
Notes payable to banks                   20,000          20,000          15,000          15,000
                                                                                        
Long-term debt                        1,025,000       1,176,389       1,125,000       1,245,688
</TABLE>

                  The carrying amount of cash and cash equivalents, contract
         reformation costs, TCR deferred revenues and notes payable reasonably
         approximate their fair value. The fair value of long-term debt is based
         upon market quotations of similar debt at interest rates currently
         available.


                                     IV-19

<PAGE>   97


                          CITRUS CORP. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(11)     YEAR 2000 PROJECT (UNAUDITED)

                  The Company continues to assess and modify its computer
         systems to ensure they will operate properly in 2000. The Company's
         management anticipates that these Year 2000 costs, which will be
         incurred over the next two years, will not have a material impact on
         the Company's financial position or results of operations.



                                     IV-20


<PAGE>   98
                      APPENDIX TO ANNUAL REPORT ON FORM 10-K

               OF SONAT INC. FOR THE YEAR ENDED DECEMBER 31, 1997



         In compliance with Section 304 of Regulation S-T, the following
information describes pictorial and/or graphic materials contained herein:


<TABLE>
<CAPTION>
         PAGE                               DESCRIPTION

         <S>                        <C>
         I-5                        Map of the Southwestern and Southcentral
                                    United States (Colorado, Kansas, New Mexico,
                                    Texas, Oklahoma, Arkansas, Louisiana,
                                    Mississippi, and Alabama) generally showing
                                    the gas reserve basins and areas in which
                                    Exploration has significant lease interests.
                                    These leases are described in the charts on
                                    page I-4 .

         I-8                        Map of the Gulf of Mexico, offshore Texas
                                    and Louisiana, showing the location of
                                    leases and seismic data held by Sonat GOM as
                                    described on pages I-7 through I-10.

         I-19                       Map of the Southeastern United States
                                    showing the approximate location of Sonat's
                                    pipeline systems as described on pages I-12
                                    and I-13, and the underground storage
                                    facilities of Southern as described on page
                                    I-17.

         I-22                       Map of the United States and portions of
                                    Canada showing areas of operations of Sonat
                                    Energy Services as described on pages I-20
                                    and I-21.
</TABLE>
<PAGE>   99
                                  EXHIBIT INDEX



Exhibit
Number                     Exhibit

Restated Certificate of Incorporation and By-Laws

3-(a)    Restated Certificate of Incorporation of Sonat Inc. (Restating the
         Certificate of Incorporation as in effect as of April 28, 1994) filed
         as Exhibit 3(a) to Form 10-Q of Sonat Inc. for the quarter ended March
         31, 1994

3-(b)    By-Laws of Sonat Inc. as amended and in effect December 1, 1995, filed
         as Exhibit 3-(b) to Form 10-K of Sonat Inc. for the year 1995

Instruments Defining the Rights of Security Holders

4.1      Rights Agreement dated as of January 8, 1996, between Sonat Inc. and
         Chemical Mellon Shareholder Services, L.L.C., as Rights Agent, with
         exhibits, and (1) Amendment No. 1 dated as of November 22, 1998, filed
         as Exhibit 99 to Form 8-A of Sonat Inc. dated January 10, 1996, except
         (1), which was filed as Exhibit 4.1 to Form 8-K of Sonat Inc. dated
         January 30, 1998

4.2      Registration Rights Agreement, dated as of January 30, 1998, by and
         between Sonat Inc., Selim K. Zilkha, Michael Zilkha, the Selim K.
         Zilkha Trust and the Selim K. Zilkha (1996) Annuity Trust, filed as
         Exhibit 10.1 to Form 8-K of Sonat Inc. dated January 30, 1998

4.3      Form of Indenture dated June 1, 1986, from Sonat Inc. to Manufacturers
         Hanover Trust Company, Trustee, as amended by (1) First Supplemental
         Indenture dated June 1, 1995, between Sonat Inc. and Chemical Bank,
         successor by merger to Manufacturers Hanover Trust Company, as Trustee,
         filed as Exhibit 4-(1) to Amendment No. 1 to Registration No. 33-5947
         dated June 4, 1986, except (1), which was filed as Exhibit 4-(1) to
         Form 8-K of Sonat Inc. dated June 6, 1995

4.4      Specimen Note of Sonat Inc. for the $200 million 67/8% Notes due June
         1, 2005, issued under Registration Statement No. 33-62166, filed as
         Exhibit 4-(2) to Form 8-K of Sonat Inc. dated June 6, 1995

4.5      Specimen Note of Sonat Inc. for the $100 million 91/2% Notes due August
         15, 1999, issued under Registration Statement No. 33-5947, filed as
         Exhibit 4-2(c) to Form 10-K of Sonat Inc. for the year 1996

<PAGE>   100


Exhibit
Number                     Exhibit

4.6      Specimen Note of Sonat Inc. for the $100 million 9% Notes due May 1,
         2001, issued under Registration Statement No. 33-5947, filed as Exhibit
         4-(2) to Form 8-K of Sonat Inc. dated April 30, 1991

4.7      Specimen Note of Sonat Inc. for the $100 million 6.75% Notes due
         October 1, 2007, issued under Registration Statement No. 33-62166,
         filed as Exhibit 4-(3) to Form 8-K of Sonat Inc. dated September 25,
         1997

4.8      Specimen Note of Sonat Inc. for the $100 million 6-5/8% Notes due
         February 1, 2008, issued under Registration Statement No. 33-62166,
         filed as Exhibit 4-(3) to Form 8-K of Sonat Inc. dated January 27, 1998

4.9      Specimen Note of Sonat Inc. for the $100 million 7% Notes due February
         1, 2018, issued under Registration Statement No. 33-62166, filed as
         Exhibit 4-(3) to Form 8-K of Sonat Inc. dated January 29, 1998

4.10     Form of Indenture dated June 1, 1987, from Southern Natural Gas Company
         to Manufacturers Hanover Trust Company, Trustee, as amended by (1)
         First Supplemental Indenture, dated as of September 30, 1997, between
         Southern Natural Gas Company and The Chase Manhattan Bank (formerly
         Chemical Bank, successor by merger to Manufacturers Hanover Trust
         Company), filed as Exhibit 4-(1) to Registration No. 33-47266 of
         Southern Natural Gas Company dated April 16, 1992, except (1) which was
         filed as Exhibit 4-(2) to Form 8-K of Southern Natural Gas Company
         dated September 25, 1997

4.11     Specimen Note of Southern Natural Gas Company for the $100 million
         87/8% Notes due February 15,2001, issued under Registration Statement
         33-16190, filed as Exhibit 4-(2) to Form 8-K of Southern Natural Gas
         Company dated February 7, 1991

4.12     Specimen Note of Southern Natural Gas Company for the $100 million
         7.85% Notes due January 15, 2002, issued under Registration Statement
         33-16190, filed as Exhibit 4-(2) to Form 8-K of Southern Natural Gas
         Company dated January 14, 1992

4.13     Specimen Note of Southern Natural Gas Company for the $100 million
         85/8% Notes due May 1, 2002, issued under Registration Statement
         33-47266, filed as Exhibit 4.3(d) to Form 10-K of Sonat Inc. for the
         year 1996

                                      -2-
<PAGE>   101

Exhibit
Number                     Exhibit

4.14     Specimen Note of Southern Natural Gas Company for the $100 million
         6.70% Notes due October 1, 2007, issued under Registration Statement
         33-47266, filed as Exhibit 4-(3) to Form 8-K of Southern Natural Gas 
         Company. dated September 25, 1997

4.15     $400 Million Note Agreement dated November 3, 1986, between Citrus
         Corp. and the Purchasers named therein, filed as Exhibit 4-(5) to Form
         10-K of Sonat Inc. for the year 1990

4.16     Credit Agreement dated as of June 1, 1996, among Sonat Inc., the Banks
         named therein, and The Chase Manhattan Bank (National Association), and
         Morgan Guaranty Trust Company of New York, as Co-Agents, filed as
         Exhibit 4 to Form 10-Q of Sonat Inc. for the quarter ended June 30,
         1996

4.17     Credit Agreement dated as of January 26, 1998, among Sonat Inc., the
         Banks named therein, and The Chase Manhattan Bank, Morgan Guaranty
         Trust Company of New York, and SunTrust Bank, Atlanta, as Agents, filed
         herewith

4.18     Certificate of Designations of Series A Participating Preference Stock
         of Sonat Inc. dated January 8, 1996, as filed with the Secretary of
         State of the State of Delaware January 16, 1996, filed as Exhibit 4.6
         to Form 10-K of Sonat Inc. for the year 1995

Compensation Plans and Management Contracts

10.1     Supplemental Benefit Plan of Sonat Inc. as Amended and Restated
         effective January 1, 1995, and (1) amendment dated December 1, 1995,
         filed as Exhibit 10.1 to Form 10-K of Sonat Inc. for the year 1996

10.2     Executive Award Plan of Sonat Inc. as Amended and Restated as of
         December 1, 1995, (corrected on December 4, 1996), and (1) amendment
         dated December 6, 1996, filed as Exhibit 10.2 to Form 10-K of Sonat
         Inc. for the year 1996

10.3     Restricted Stock Plan for Directors of Sonat Inc. (as Amended and
         Restated as of February 26, 1998), filed herewith

10.4     Performance Award Plan of Sonat Inc. effective as of January 27, 1994,
         and (1) amendment dated December 1, 1995, filed as Exhibit 10-(7) to

                                      -3-
<PAGE>   102

Exhibit
Number                     Exhibit

         Form 10-K of Sonat Inc. for the year 1993, except (1), which was filed
         as Exhibit 10.7 to Form 10-K of Sonat Inc. for the year 1995

10.5     Cash Bonus Plan of Sonat Inc. effective as of January 27, 1994, and (1)
         amendment dated December 1, 1995, filed as Exhibit 10-(8) to Form 10-K
         of Sonat Inc. for the year 1993, except (1), which was filed as Exhibit
         10.8.to Form 10-K of Sonat Inc. for the year 1995

10.6     Sonat Inc. Retirement Plan for Directors as Amended and Restated as of
         December 2, 1994, and (1) amendment dated December 1, 1995, filed as
         Exhibit 10.9 to Form 10-K of Sonat Inc. for the year 1994, except (1),
         which was filed as Exhibit 10.9 to Form 10-K of Sonat Inc. for the year
         1995

10.7     Executive Severance Agreement dated December 1, 1995, between Sonat
         Inc. and William A. Smith and schedule identifying substantially
         identical Executive Severance Agreements between Sonat Inc. and other
         parties, filed herewith

10.8     Executive Severance Agreement as amended and restated as of January 22,
         1998, between Sonat Inc. and Ronald L. Kuehn, Jr., filed herewith

10.9     Executive Severance Agreement as amended and restated as of January 22,
         1998, between Sonat Inc. and Donald G. Russell, filed herewith

10.10    Directors' Fees Deferral Plan of Sonat Inc. as Amended and Restated as
         of January 1, 1997, filed herewith

10.11    Indemnity Agreement dated December 4, 1987, between Sonat Inc. and
         Ronald L. Kuehn, Jr. and schedule identifying substantially identical
         indemnity agreements between Sonat Inc. and other directors of Sonat
         Inc. and (1) Indemnity Agreement dated September 1, 1994, between Sonat
         Inc. and Adrian M. Tocklin, (2) Indemnity Agreement dated September 22,
         1994, between Sonat Inc. and Donald G. Russell, (3) Indemnity Agreement
         dated November 1, 1995, between Sonat Inc. and Max L. Lukens, (4)
         Indemnity Agreement dated January 30, 1998, between Sonat Inc. and
         Michael S. Zilkha, and (5) Indemnity Agreement dated January 30, 1998,
         between Sonat Inc. and Selim K. Zilkha, filed as Exhibit 10-(11) to
         Form 10-K of Sonat Inc. for the year 1992, except (1), which was filed
         as Exhibit 10.3 to Form 10-Q of Sonat Inc. for the quarter ended
         September 30, 1994, (2), which was filed as Exhibit 10.4 to Form 10-Q
         of Sonat Inc. for


                                      -4-
<PAGE>   103

Exhibit
Number                     Exhibit

         the quarter ended September 30, 1994, (3), which was filed as Exhibit
         10.12 to Form 10-K of Sonat Inc. for the year 1995, and (4) and (5)
         which are filed herewith

10.12    Trust Agreement dated December 19, 1986, between Sonat Inc. and AmSouth
         Bank N.A. for Section 415 Retirement Plan Benefits and Vesting Benefits
         under the Supplemental Benefit Plan and Early Retirement Benefits under
         the Executive Severance Agreements, filed as Exhibit 10-(15) to Form
         10-K of Sonat Inc. for the year 1991

10.13    Trust Agreement dated December 19, 1986, between Sonat Inc. and AmSouth
         Bank N.A. for Section 415 Stock Purchase Plan Benefits under the
         Supplemental Benefit Plan, filed as Exhibit 10-(16) to Form 10-K of
         Sonat Inc. for the year 1991

10.14    Trust Agreement dated December 19, 1986, between Sonat Inc. and AmSouth
         Bank N.A. for Benefits under the Retirement Plan for Directors, filed
         as Exhibit 10-(17) to Form 10-K of Sonat Inc. for the year 1991

10.15    Form of Sonat Inc. Executive Life Insurance Program Split Dollar
         Agreement, Collateral Assignment Agreement, and Program Description,
         each dated as of July 1, 1990, with (1) schedule identifying the
         persons participating in such Programs, filed as Exhibit 10-(20) to
         Form 10-K of Sonat Inc. for the year 1990, except (1), which is filed
         herewith

10.16    Sonat Inc. Deferred Compensation Plan - Plan Summary dated November
         1997, filed herewith

Other Material Contracts

10.17    Capital Stock Agreement among Sonat Inc., Enron Corp., Houston Natural
         Gas Corporation, and Citrus Corp. dated June 30, 1986, filed as Exhibit
         10-(26) to Form 10-K of Sonat Inc. for the year 1991

10.18    Standby Note Purchase Agreement among Sonat Inc., Credit Lyonnais New
         York Branch, as Administrative Agent for the Banks party to the
         Revolving Credit Agreement with Citrus Corp., and Citrus Corp. dated
         December 23, 1993, and the $300 Million Revolving Credit Agreement
         dated as of December 23, 1993, among Citrus Corp., as Borrower, and The
         Banks named therein, as Banks, and Credit Lyonnais New York Branch and
         The


                                      -5-
<PAGE>   104

Exhibit
Number                     Exhibit

         Toronto-Dominion Bank, as Managing Agents, to which the Standby Note
         Purchase Agreement applies, filed as Exhibit 10-(23) to Form 10-K of 
         Sonat Inc. for the year 1993

Other Exhibits

12       Computation of Ratio of Earnings to Fixed Charges, filed herewith

21       Subsidiaries of Sonat Inc., filed herewith

22       Proxy Statement of Sonat Inc. dated as of March 21, 1998 which is not
         to be deemed "filed" as part of this Form 10-K, except to the extent
         incorporated by reference under Items 10, 11, 12 and 13 of Part III of
         this Form 10-K, filed herewith

23.1     Consent of Ernst & Young LLP, Independent Auditors, dated March 23,
         1998, filed herewith

23.2     Consent of Cobb & Associates, Independent Petroleum Engineers, dated 
         March 23, 1998, filed herewith

24       Powers of Attorney authorizing Ronald L. Kuehn, Jr.; Thomas W. Barker,
         Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin to
         sign the Sonat Inc. Annual Report on Form 10-K for the fiscal year
         ended December 31, 1997, on behalf of certain directors and officers of
         the registrant, filed herewith

27.1     Financial Data Schedule for the period ended December 31, 1997, filed
         herewith, electronically only


27.2     Financial Data Schedule for the period ended December 31, 1996, filed
         herewith, electroncially only

27.3     Financial Data Schedule for the period ended December 31, 1995, filed
         herewith, electroncially only



                                      -6-



<PAGE>   1
                                                                     EXHIBT 4.17


- --------------------------------------------------------------------------------

                                CREDIT AGREEMENT


                          dated as of January 26, 1998


                                      among


                                   SONAT INC.,


                             THE BANKS NAMED HEREIN,


                                       and


                            THE CHASE MANHATTAN BANK,
                            as Administrative Agent,


                          MORGAN GUARANTY TRUST COMPANY
                                  OF NEW YORK,
                              as Syndication Agent


                                       and


                             SUNTRUST BANK, ATLANTA,
                             as Documentation Agent

- --------------------------------------------------------------------------------
<PAGE>   2
                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
Article                                                                            Page
- -------                                                                            ----
<S>      <C>                                                                       <C>
I.       LOANS...................................................................    1

              Section 1.01 Syndicated Loans......................................    1
              Section 1.02 Money Market Loans....................................    1
              Section 1.03 Swingline Commitment..................................    4
              Section 1.04 Change of Commitments.................................    5
              Section 1.05 Borrowings of Syndicated Loans........................    6
              Section 1.06 Several Commitments; Remedies Independent.............    8
              Section 1.07 Availability of Funds.................................    8
              Section 1.08 Borrowings of Swingline Loans.........................    8
              Section 1.09 Lending Offices.......................................    9
              Section 1.10 Notes.................................................    9

II.      PAYMENTS, INTEREST AND CERTAIN FEES.....................................   10

              Section 2.01 Repayment of Loans....................................   10
              Section 2.02 Interest..............................................   10
              Section 2.03 Interest Periods......................................   11
              Section 2.04 Prepayments...........................................   11
              Section 2.05 Payments, etc.........................................   12
              Section 2.06 Pro Rata Treatment; Sharing...........................   13
              Section 2.07 Computations..........................................   14
              Section 2.08 Facility Fee..........................................   14
              Section 2.09 Administration Fee....................................   14

III.     PROVISIONS RELATING TO FIXED RATE LOANS.................................   14

              Section 3.01 Additional Costs......................................   14
              Section 3.02 Limitation on Types of Loans..........................   17
              Section 3.03 Illegality............................................   17
              Section 3.04 Treatment of Affected Loans...........................   17
              Section 3.05 Compensation..........................................   18
              Section 3.06 Survival..............................................   18

IV.      CONDITIONS..............................................................   18

              Section 4.01 Conditions to Effectiveness...........................   18
              Section 4.02 Conditions Precedent to Loans.........................   19

V.       COVENANTS...............................................................   20

              Section 5.01 Financial Statements..................................   20
</TABLE>


                                       i
<PAGE>   3
<TABLE>
<CAPTION>
Article                                                                            Page
- -------                                                                            ----
<S>      <C>                                                                       <C>
              Section 5.02 Access to Books and Inspection........................   21
              Section 5.03 Litigation............................................   21
              Section 5.04 Maintenance of Existence..............................   21
              Section 5.05 Merger; Sale of Assets................................   21
              Section 5.06 Default; Investment Rating............................   22
              Section 5.07 ERISA.................................................   22
              Section 5.08 Liens.................................................   23
              Section 5.09 Total Indebtedness to Consolidated Capitalization.....   24
              Section 5.10 Certain Existing Credit Lines.........................   24
              Section 5.11 Insurance.............................................   24
              Section 5.12 Maintenance of Properties.............................   24
              Section 5.13 Public Utility Holding Company Act....................   24

VI.      REPRESENTATIONS AND WARRANTIES..........................................   24

              Section 6.01 Corporate Existence and Powers........................   24
              Section 6.02 Corporate Authority, etc..............................   25
              Section 6.03 Financial Condition...................................   25
              Section 6.04 Litigation............................................   25
              Section 6.05 Taxes.................................................   26
              Section 6.06 Approvals.............................................   26
              Section 6.07 ERISA.................................................   26
              Section 6.08 Margin Regulations....................................   26
              Section 6.09 Certain Subsidiaries..................................   26
              Section 6.10 Investment Company Act................................   26
              Section 6.11 Environmental Laws....................................   26

VII.     EVENTS OF DEFAULT.......................................................   27

VIII.    MISCELLANEOUS...........................................................   29

              Section 8.01 Waiver................................................   29
              Section 8.02 Notices and Delivery of Documents.....................   29
              Section 8.03 Governing Law.........................................   29
              Section 8.04 Offsets, etc..........................................   29
              Section 8.05 Disposition of Loans..................................   29
              Section 8.06 Expenses..............................................   30
              Section 8.07 Amendments, Waivers, etc..............................   30
              Section 8.08 Definitions...........................................   31
              Section 8.09 Successors and Assigns................................   31
              Section 8.10 Counterparts..........................................   32

IX. THE AGENTS...................................................................   32

              Section 9.01 Appointment, Power and Immunities.....................   32
</TABLE>


                                       ii
<PAGE>   4
<TABLE>
<CAPTION>
Article                                                                            Page
- -------                                                                            ----
<S>      <C>                                                                       <C>
              Section 9.02 Reliance by Agents....................................   33
              Section 9.03 Default...............................................   33
              Section 9.04 Rights as a Lender....................................   33
              Section 9.05 Indemnification.......................................   34
              Section 9.06 Reports...............................................   34
              Section 9.07 Non-Reliance on Agents and Other Banks................   34
              Section 9.08 Failure to Act........................................   35
              Section 9.09 Resignation or Removal of Agents......................   35
              Section 9.10 Documentation Agent...................................   35
</TABLE>


SCHEDULE 1                 Definitions
SCHEDULE 2                 Lending Offices and/or Addresses for Notices
SCHEDULE 3                 Commitments

EXHIBIT A-1                Form of Note for Syndicated Loans 
EXHIBIT A-2                Form of Note for Money Market Loans 
EXHIBIT A-3                Form of Note for Swingline Loans 
EXHIBIT B                  Form of Opinion of Counsel to the Company 
EXHIBIT C                  Form of Opinion of Special New York
                           Counsel to the Banks
EXHIBIT D                  Form of Money Market Quote Request
EXHIBIT E                  Form of Money Market Quote






                                      iii
<PAGE>   5
                  CREDIT AGREEMENT dated as of January 26, 1998 among SONAT
INC., a Delaware corporation (the "Company"); the undersigned banks (each herein
called a "Bank"); and THE CHASE MANHATTAN BANK, as Administrative Agent, MORGAN
GUARANTY TRUST COMPANY OF NEW YORK, as Syndication Agent and SUNTRUST BANK,
ATLANTA, as Documentation Agent (in such capacities, each such agent being
herein called an "Agent" and collectively the "Agents").

                  The Company has requested the Banks to extend credit to the
Company for the general corporate purposes of the Company. The Banks are
prepared to do so on the terms hereof.

                  Accordingly, the Company, each Bank and the Agents hereby
agree as follows:

                  I. LOANS

                  Section 1.01 Syndicated Loans. Each Bank severally agrees, on
the terms of this Agreement, to make loans to the Company in Dollars during the
period from and including the date hereof to but not including the Commitment
Termination Date in an aggregate principal amount at any one time outstanding up
to but not exceeding the amount of such Bank's Commitment as then in effect.
Subject to the terms of this Agreement, during such period the Company may
borrow, repay and reborrow the amount of the Commitments; provided that the sum
of (i) the aggregate principal amount of all Money Market Loans, plus (ii) the
aggregate principal amount of all Syndicated Loans plus (iii) the aggregate
principal amount of all Swingline Loans, at any one time outstanding shall not
exceed the aggregate amount of the Commitments at such time except that,
notwithstanding the foregoing, Money Market Loans outstanding at the time of any
termination or reduction of the Commitments pursuant to Section 1.04 hereof need
not be prepaid on account of this proviso.

                  Section 1.02 Money Market Loans.

                  (a) In addition to borrowings of Syndicated Loans, the Company
may, as set forth in this Section 1.02, request the Banks to make offers to make
Money Market Loans to the Company in Dollars. The Banks may, but shall have no
obligation to, make such offers and the Company may, but shall have no
obligation to, accept any such offers in the manner set forth in this Section
1.02. Money Market Loans shall be Set Rate Loans, provided that:

                           (i)      there may be no more than fifteen different
         Interest Periods for both Syndicated Loans (other than Domestic Loans)
         and Money Market Loans outstanding at the same time (for which purpose
         Interest Periods described in different lettered clauses of the
         definition of the term "Interest Period" in Section 2.03 hereof shall
         be deemed to be different Interest Periods even if they are
         coterminous); and

                           (ii)     the sum of (x) aggregate principal amount of
         all Money Market Loans, plus (y) the aggregate principal amount of all
         Syndicated Loans plus (z) the aggregate principal amount of all
         Swingline Loans, at any one time outstanding shall not 
<PAGE>   6
         exceed the aggregate amount of the Commitments at such time except
         that, notwithstanding the foregoing, Money Market Loans outstanding at
         the time of any termination or reduction of the Commitments pursuant to
         Section 1.04 hereof need not be prepaid on account of this proviso.

                  (b) When the Company wishes to request offers to make Money
Market Loans, it shall give each Bank notice (a "Money Market Quote Request") so
as to be received no later than 11:00 a.m. New York time on the Business Day
next preceding the date of borrowing proposed therein or such other time and
date as the Company and the Majority Banks may agree. The Company may request
offers to make Money Market Loans for up to three different Interest Periods in
a single notice (for which purpose Interest Periods in different lettered
clauses of the definition of the term "Interest Period" shall be deemed to be
different Interest Periods even if they are coterminous); provided that the
request for each separate Interest Period shall be deemed to be a separate Money
Market Quote Request for a separate borrowing (a "Money Market Borrowing"). Each
such notice shall be substantially in the form of Exhibit D hereto and shall
specify as to each Money Market Borrowing:

                           (i)      the proposed date of such borrowing, which
         shall be a Business Day;

                           (ii)     the aggregate amount of such Money Market
         Borrowing, which shall be at least $25,000,000 (or in larger multiples
         of $5,000,000) but shall not cause the limits specified in Section 1.02
         hereof to be violated (without giving effect to any other Money Market
         Borrowing subject to a simultaneous Money Market Quote Request);

                           (iii)    the duration of the Interest Period
         applicable thereto; and

                           (iv)     the date on which the Money Market Quotes
         are to be submitted if it is before the proposed date of borrowing (the
         date on which such Money Market Quotes are to be submitted is called
         the "Quotation Date").

Except as otherwise provided in this Section 1.02, no Money Market Quote Request
shall be given within five Business Days (or such other number of days as the
Company and the Majority Banks may agree) of any other Money Market Quote
Request.

                  (c)      (i)      Each Bank may submit one or more Money 
Market Quotes, each containing an offer to make a Money Market Loan in response
to any Money Market Quote Request; provided that, if the Company's request under
Section 1.02(b) hereof specified more than one Interest Period, such Bank may
make a single submission containing one or more Money Market Quotes for each
such Interest Period. Each Money Market Quote must be submitted to the Company
not later than 10:00 a.m. New York time on the Quotation Date or such other time
and date as the Company and the Majority Banks may agree. Subject to Section
3.02(b), Section 3.03, Section 4.02 and Article VII hereof, any Money Market
Quote so made shall be irrevocable except with the written consent of the
Company.


                                       2
<PAGE>   7
                           (ii)     Each Money Market Quote shall be
         substantially in the form of Exhibit E hereto and shall specify:

                           (A) the proposed date of borrowing and the Interest
                  Period therefor;

                           (B) the principal amount of the Money Market Loan for
                  which each such offer is being made, which principal amount
                  shall be at least $5,000,000 or a larger multiple of
                  $1,000,000; provided that the aggregate principal amount of
                  all Money Market Loans for which a Bank submits Money Market
                  Quotes (x) may be greater or less than the Commitment of such
                  Bank but (y) may not exceed the principal amount of the Money
                  Market Borrowing for a particular Interest Period for which
                  offers were requested;

                           (C) the rate of interest per annum (rounded upwards,
                  if necessary, to the nearest 1/10,000th of 1%) offered for
                  each Money Market Loan (the "Money Market Rate"); and

                           (D) the identity of the quoting Bank.

Unless otherwise agreed by the Company, no Money Market Quote shall contain
qualifying, conditional or similar language or propose terms other than or in
addition to those set forth in the applicable Money Market Quote Request and, in
particular, no Money Market Quote may be conditioned upon acceptance by the
Company of all (or some specified minimum) of the principal amount of the Money
Market Loan for which such Money Market Quote is being made.

                  (d) Not later than 11:30 a.m. New York time on the Quotation
Date or such other time and date as the Company and the Majority Banks may
agree, the Company shall notify each Bank of its acceptance or nonacceptance of
the offers so notified to it pursuant to Section 1.02(c)(i) hereof (and the
failure of the Company to give such notice by such time shall constitute
nonacceptance). In the case of acceptance, such notice shall specify the
aggregate principal amount of offers for each Interest Period that are accepted.
The Company may accept any Money Market Quote in whole or in part (provided that
any Money Market Quote accepted in part shall be at least $5,000,000 or in
larger multiples of $1,000,000); provided that:

                           (i)      the aggregate principal amount of each Money
         Market Borrowing may not exceed the applicable amount set forth in the
         related Money Market Quote Request;

                           (ii)     the aggregate principal amount of each Money
         Market Borrowing shall be at least $25,000,000 (or in larger multiples
         of $5,000,000) but shall not cause the limits specified in Section 1.02
         hereof to be violated;

                        (iii) acceptance of offers may be made only in ascending
         order of Money Market Rates, in each case commencing with the lowest
         rate so offered; and


                                       3
<PAGE>   8
                           (iv)     the Company may not accept any offer that
         fails to comply with Section 1.02(c)(ii) hereof or otherwise fails to
         comply with the requirements of this Agreement (including, without
         limitation, Section 1.02(a) hereof).

If offers are made by two or more Banks with the same Money Market Rates for a
greater aggregate principal amount than the amount in respect of which offers
are accepted for the related Interest Period, the principal amount of Money
Market Loans in respect of which such offers are accepted shall be allocated by
the Company among such Banks as nearly as possible (in multiples of $1,000,000)
in proportion to the aggregate principal amount of such offers. Determinations
by the Company of the amounts of Money Market Loans shall be conclusive in the
absence of manifest error. Promptly after the acceptance by the Company of any
Money Market Quote, the Company shall give Chase notice of the principal amount
of each Money Market Loan to be made pursuant to such Money Market Quote, the
rate of interest per annum and the duration of the Interest Period applicable
thereto and the name of the Bank making such Loan.

                  (f) Any Bank whose offer to make any Money Market Loan has
been accepted shall, not later than 1:00 p.m. New York time on the date
specified for the making of such Loan, make the amount of such Loan available to
Chase at account number 323-506909 maintained by Chase with The Chase Manhattan
Bank at its Principal Office in immediately available funds, for account of the
Company. The amount so received by Chase shall, subject to the terms and
conditions of this Agreement, be made available to the Company on such date by
depositing the same, in immediately available funds, in an account of the
Company maintained with The Chase Manhattan Bank at its Principal Office
designated by the Company.

                  (g) The amount of any Money Market Loan made by any Bank shall
not constitute a utilization of such Bank's Commitment.

                  Section 1.03 Swingline Commitment. Subject to the terms and
conditions hereof, the Swingline Bank agrees to make a portion of the credit
otherwise available to the Company under the Commitments by making swingline
loans ("Swingline Loans") in Dollars to the Company during the period from and
including the date hereof to but not including the Commitment Termination Date;
provided that (a) the aggregate principal amount of Swingline Loans outstanding
at any time shall not exceed the Swingline Commitment then in effect, (b) the
aggregate principal amount of Swingline Loans plus the aggregate principal
amount of Syndicated Loans made by the Swingline Bank outstanding at any time
shall not exceed the Swingline Bank's Commitment then in effect, and (c) the
Company shall not request, and the Swingline Bank shall not make, any Swingline
Loan if, after giving effect to the making of such Swingline Loan, the sum of
(i) the aggregate principal amount of all Money Market Loans, plus (ii) the
aggregate principal amount of all Syndicated Loans plus (iii) the aggregate
principal amount of all Swingline Loans, at any one time outstanding shall
exceed the aggregate amount of the Commitments at such time except that,
notwithstanding the foregoing, Money Market Loans outstanding at the time of any
termination or reduction of the Commitments pursuant to Section 1.04 hereof need
not be prepaid on account of this proviso. During such period, the Company may


                                       4
<PAGE>   9
use the Swingline Commitment by borrowing, repaying and reborrowing, all in
accordance with the terms and conditions hereof.

                  Section 1.04 Change of Commitments.

                  (a) The Company shall have the right at any time or from time
to time upon not less than three Business Days' prior notice to Chase
(specifying the date and the aggregate amount of each such reduction or
termination) to terminate in whole, or to reduce in part, (i) the aggregate
unused amount of the Commitments (and, in accordance with Section 1.02(g)
hereof, outstanding Money Market Loans shall not constitute a utilization of the
Commitments) and/or (ii) the aggregate unused amount of the Swingline
Commitment. Each such reduction of the Commitments shall be in an aggregate
amount of at least $25,000,000 and a multiple of $1,000,000 and each such
reduction of the Swingline Commitment shall be in an aggregate amount of at
least $5,000,000 and a multiple of $1,000,000. Chase shall promptly notify each
Bank of its proportionate share and the date of each such reduction.

                  (b) If either (i) during any period of 12 consecutive months,
individuals who were directors of the Company at the beginning of such period
cease to constitute a majority of the board of directors of the Company (except
for changes due to the retirement or death of any such individuals) or (ii) any
Person (or group of Persons which has an agreement, arrangement or understanding
for the purpose of acquiring the shares of the Company) shall acquire, directly
or indirectly, beneficial ownership or control of more than 50% of the then
outstanding voting shares of the Company (either such event being hereinafter
referred to as a "Change in Control"), then each Bank (through Chase) may, by
notice to the Company not later than the date 20 Business Days after the Company
shall have notified the Agents of any such Change in Control, reduce the
Commitment of such Bank in an amount equal to the unused amount of such Bank's
Commitment (and, in accordance with Section 1.02(g) hereof, outstanding Money
Market Loans shall not constitute a utilization of such Bank's Commitment) and
the Swingline Bank, by such notice, may reduce the Swingline Commitment in an
amount equal to the unused amount thereof. The Company agrees, as soon as it
shall become known to one of its senior officers, to notify the Agents of any
such Change in Control (and Chase shall promptly notify the Banks thereof), but
the failure to so notify shall not preclude any Bank from reducing the unused
amount of such Bank's Commitment as aforesaid.

                  (c) Provided that no Default shall have occurred and be
continuing, the Company may at any time terminate the Commitment of any Bank
(and, in the case of the Swingline Bank, the Swingline Commitment) that has
claimed any compensation under Section 3.01(a) or Section 3.01(c) hereof at any
time during the preceding one-month period, in whole but not in part, by (i)
giving Chase (which shall promptly notify such Bank) not less than five Business
Days' prior notice thereof, which notice shall be irrevocable and effective only
upon receipt by Chase and shall specify the identity of such Bank and the
effective date of such termination, and (ii) paying to such Bank (and there
shall become due and payable) on such date the outstanding principal amount of
all Loans made by such Bank, interest on such principal amount accrued to such
date, any amounts payable to such Bank pursuant to Article III hereof in
connection therewith and all other amounts owing to such Bank by the Company
hereunder (provided that 


                                       5
<PAGE>   10
the obligations of the Company under Article III and Section 8.06 hereof to such
Bank shall survive such termination).

                  (d) Provided that no Default shall have occurred and be
continuing, the Company may at any time replace any Bank that has claimed any
compensation under Section 3.01(a) or Section 3.01(c) hereof at any time during
the preceding one-month period, in whole but not in part, by giving Chase not
less than five Business Days' prior notice (and Chase shall promptly notify such
Bank), that it intends to replace such Bank with one or more banks (which may
include any other Bank under this Agreement) selected by the Company and
acceptable to Chase (which shall not unreasonably withhold its consent). Any
such replacement shall be accomplished pursuant to documentation in form and
substance satisfactory to Chase. Upon the effective date of any replacement
under this Section 1.04(d) (and as a condition thereto), the Company shall repay
to the Bank being replaced the principal of and interest on each Loan then
outstanding from such Bank together with all other amounts owing to such Bank
hereunder and such replacement bank (or banks, as the case may be) shall make a
loan (or loans) to the Company in the (aggregate) principal amount of each such
Loan so repaid which loan (or loans) shall be of the same type and have the same
maturity and interest rate as the respective Loan so repaid), whereupon such
replacement bank (or banks) shall become a "Bank" (or "Banks") for all purposes
of this Agreement having a Commitment (or Commitments in the aggregate) (and, in
the case of the Swingline Bank, the Swingline Commitment) in the amount of such
Bank being replaced and such loan (or loans) shall be deemed a Loan (or Loans)
hereunder.

                  (e) The Swingline Bank may terminate in its sole discretion
the Swingline Commitment by giving the Company written notice thereof at least
30 days in advance of the date of such termination.

                  (f) The Commitments (and, in the case of the Swingline Bank,
the Swingline Commitment) once terminated or reduced may not be reinstated,
except that the Swingline Commitment may be reinstated by agreement of the
Swingline Bank and the Company.

                  Section 1.05 Borrowings of Syndicated Loans.

                  (a) Each Syndicated Loan shall be either a Domestic Loan or
Eurodollar Loan. Syndicated Loans on the occasion of any borrowing thereof
hereunder may be Domestic Loans or Eurodollar Loans (each a "type" of Loan) or
any combination thereof; provided that there may be no more than ten Interest
Periods for Eurodollar Loans outstanding at the same time; and provided,
further, that there may be no more than fifteen different Interest Periods for
both Eurodollar Loans and Money Market Loans outstanding at the same time (for
which purpose Interest Periods described in different lettered clauses of the
definition of the term "Interest Period" in Section 2.03 hereof shall be deemed
to be different Interest Periods even if they are coterminous).

                  (b) The Company shall give Chase (which shall promptly notify
the Banks) notice of each borrowing hereunder of Syndicated Loans, which notice
shall be irrevocable and effective only upon receipt by Chase, shall specify
with respect to the Syndicated Loans to be borrowed (i) the aggregate amount
(which shall be at least $10,000,000 or a multiple of 


                                       6
<PAGE>   11
$1,000,000 in excess thereof), (ii) the type or types of Loans to be borrowed
and the aggregate amount of each type, (iii) the date of such borrowing (which
shall be a Business Day), and (iv) (in the case of Eurodollar Loans) the
duration of the Interest Period therefor and shall be given not later than 11:00
a.m. New York time, in the case of Domestic Loans, on the same day as the date
of such borrowing and, in the case of Eurodollar Loans, on the day which is not
less than three Business Days prior to the date of such borrowing.

                  (c) If at any time during which Syndicated Loans are
outstanding under this Agreement the Company shall fail to give a notice of the
type referred to in Section 1.05(b) or otherwise to advise Chase in writing by
11:00 a.m. New York time on the day which is not less than one Business Day
prior to the maturity date of any such Syndicated Loans that it does not intend
to reborrow an amount at least equal to the aggregate amount of such Syndicated
Loans (or, if less, the aggregate amount of the Commitments) on such maturity
date, the Company shall be deemed to have given on such first Business Day
preceding such maturity date a notice of borrowing hereunder for Domestic Loans
to be made on such date in an amount equal to the lesser of (i) the aggregate
principal amount of the Syndicated Loans which are maturing on such date or (ii)
the aggregate amount of the Commitments to be outstanding on such date (after
giving effect to any reductions of the Commitments to be effected on such date),
and Chase shall notify the Banks of such borrowing.

                  (d) Subject to Chase's receipt or deemed receipt of a notice
of borrowing as provided in Section 1.05(b) or Section 1.05(c) hereof and to
Chase's receipt of notice from the Swingline Bank of the outstanding principal
amount of the Swingline Loans as of the Swingline Business Day next preceding
the date of such notice of borrowing, Chase shall give each Bank not less than
three Business Days' prior notice (with respect to each borrowing of Eurodollar
Loans) or same-day notice by noon (with respect to each borrowing of Domestic
Loans), as the case may be, of each such borrowing specifying (i) the aggregate
amount to be borrowed, (ii) the date of borrowing, (iii) the type or types of
Loans to be borrowed, (iv) in the case of any Fixed Rate Loans to be borrowed,
the duration of the Interest Period therefor and (v) such Bank's pro rata
portion thereof. Each Bank's (other than the Swingline Bank's) pro rata portion
of each Syndicated Loan shall equal a fraction, the numerator of which shall be
the amount of such Bank's Commitment as of the date the notice of borrowing is
given for such Syndicated Loan and the denominator of which shall be (i) the
aggregate Commitments of all Banks as of the date such notice of borrowing is
given minus (ii) the outstanding principal amount of the Swingline Loans as of
the next preceding Swingline Business Day. The Swingline Bank's pro rata portion
of each Syndicated Loan shall equal a fraction, the numerator of which shall be
(i) the amount of the Swingline Bank's Commitment as of the date the notice of
borrowing is given with respect to such Syndicated Loan minus (ii) the
outstanding principal amount of the Swingline Loans as of the next preceding
Swingline Business Day and the denominator of which shall be (i) the aggregate
Commitment of all Banks as of the date such notice of borrowing is given minus
(ii) the outstanding principal amount of the Swingline Loans as of the next
preceding Swingline Business Day. From and including the date that notice of a
borrowing of a Syndicated Loan is given to but excluding the date that such
Syndicated Loan is made, the principal amount of such Syndicated Loan required
to be made by the Swingline Bank shall be deemed to be outstanding for purposes
of clause (b) of Section 1.03.


                                       7
<PAGE>   12
                  (e) Not later than 1:00 p.m. New York time on the date
specified for each borrowing of Syndicated Loans, each Bank shall make available
to Chase, at account number 323-506909 maintained by The Chase Manhattan Bank at
its Principal Office in immediately available funds the amount of the Syndicated
Loan or Syndicated Loans to be made by it on such date, for account of the
Company. The amount so received by Chase shall, subject to the terms and
conditions of this Agreement, be made available to the Company on such date by
depositing the same, in immediately available funds, in an account of the
Company maintained with The Chase Manhattan Bank at its Principal Office
designated by the Company. If any Bank shall (i) be obligated but fail to make
available the amount of the Syndicated Loan to be made by it on the date
specified for a borrowing hereunder and (ii) have any Syndicated Loans which are
maturing on such date, such maturing Syndicated Loans shall automatically be
extended in an amount equal to (but not in excess of) the amount of the
Syndicated Loan to be made and in the type and for the Interest Period of such
Loan to be made (and such Loan which would otherwise mature on such date shall
not be considered to be past due hereunder).

                  Section 1.06 Several Commitments; Remedies Independent. The
failure of any Bank to make any Loan to be made by it shall not relieve any
other Bank of its obligation to make its Loan on such date, but neither any
other Bank nor any Agent shall be responsible for such failure. The amounts
payable at any time by the Company hereunder and under the Notes to each Bank
shall be a separate and independent debt and each Bank shall be entitled to
protect and enforce its rights arising out of this Agreement and the Notes, and
it shall not be necessary for any other Bank or any Agent to consent to, or to
be joined as an additional party in, any proceedings for such purposes.

                  Section 1.07 Availability of Funds. Unless Chase shall have
been notified by a Bank prior to the date of any borrowing hereunder that such
Bank does not intend to make available to Chase such Bank's Loans to be made on
such day, Chase may assume that such Bank has made the amount of such Loans to
be made available to Chase on such date and Chase may in reliance upon such
assumption (but shall not be required to) make available to the Company a
corresponding amount. If such proceeds are not in fact made available to Chase
by such Bank, Chase shall be entitled to recover such corresponding amount on
demand from such Bank (or, if such Bank fails to pay such corresponding amount
forthwith upon such demand, from the Company) together with interest thereon in
respect of each day during the period commencing on the date such corresponding
amount was made available to the Company and ending on (but excluding) the date
Chase recovers such corresponding amount at a rate per annum equal to the
Federal Funds Rate for such day (or if such day is not a Business Day, the next
preceding Business Day).

                  Section 1.08 Borrowings of Swingline Loans. (a) If on any
Swingline Business Day prior to the Commitment Termination Date the aggregate
disbursements authorized by the Company and made from the Swingline Account
exceed the aggregate cash on hand and deposits received in the Swingline Account
on such Swingline Business Day, the Swingline Bank shall make a Swingline Loan
to the Company in an amount equal to such excess (subject to the provisions of
Section 1.03 hereof), unless otherwise instructed by the Company. Each Swingline
Loan shall be credited to the Swingline Account as of the date made. The
outstanding Swingline 


                                       8
<PAGE>   13
Loans shall bear interest at such rate per annum as the Company and the
Swingline Bank shall agree. Accrued interest on the outstanding Swingline Loans
shall be paid on each date on which the outstanding Swingline Loans are paid in
full and on the first Swingline Business Day of each month if there are any
outstanding Swingline Loans on the Swingline Business Day next preceding such
day. The Company shall have the right to prepay the outstanding Swingline Loans,
in whole or in part, at any time. All payments with respect to Swingline Loans
shall be made at the Lending Office of the Swingline Bank. Upon request of the
Company made on any Swingline Business Day, the Swingline Bank shall give Chase
notice as promptly as practicable but in any event by no later than 11:00 a.m.
New York time on the next Swingline Business Day of the outstanding principal
amount of the Swingline Loans as of the close of business on the Swingline
Business Day next preceding the date that such notice is given to Chase.

                  (b) In the case of any of the Events of Default specified in
paragraphs A through I of Article VII hereof, (i) the Swingline Bank may, by
notice to the Company, terminate the Swingline Commitment hereunder and it shall
thereupon terminate, and (ii) the Swingline Bank may, by notice to the Company,
declare the outstanding Swingline Loans and Swingline Note and all other
obligations of the Company thereunder to be due and payable, whereupon the same
shall become forthwith due and payable, without further protest, presentment,
notice or demand, all of which are expressly waived by the Company. In case of
any of the Events of Default specified in paragraph J or K of Article VII
hereof, without any notice to the Company or any act by the Swingline Bank, the
Swingline Commitment hereunder shall terminate forthwith and the principal of
and interest accrued on the outstanding Swingline Loans and the Swingline Note
and all other obligations of the Company thereunder shall become and be due and
payable.

                  Section 1.09 Lending Offices. The Loans of each type made by
each Bank shall be made and maintained at such Bank's Applicable Lending Office
for Loans of such type.

                  Section 1.10 Notes.

                  (a) The Syndicated Loans made by each Bank shall be evidenced
by a single promissory note (a "Syndicated Note") of the Company substantially
in the form of Exhibit A-1 hereto, dated the Effective Date, payable to such
Bank in a principal amount equal to the amount of its Commitment as originally
in effect and otherwise duly completed. The date, amount, type, interest rate
and maturity date of each Syndicated Loan made by each Bank to the Company, and
each payment made on account of the principal thereof, shall be recorded by such
Bank on its books and, prior to any transfer of such Note held by it, endorsed
by such Bank on the schedule attached to such Note or any continuation thereof.
The failure of any Bank to make any notation or entry or any error in such a
notation or entry shall not, however, limit or otherwise affect any obligation
of the Company under this Agreement or the Notes.

                  (b) The Money Market Loans made by any Bank shall be evidenced
by a single promissory note (a "Money Market Note") of the Company substantially
in the form of Exhibit A-2 hereto, dated the date of the delivery of such Note
to Chase under this Agreement, payable to such Bank and otherwise duly
completed. The date, amount, interest rate and 


                                       9
<PAGE>   14
maturity date of each Money Market Loan made by each Bank to the Company, and
each payment made on account of the principal thereof, shall be recorded by such
Bank on its books and, prior to any transfer of such Note held by it, endorsed
by such Bank on the schedule attached to such Note or any continuation thereof.
The failure of any Bank to make any notation or entry or any error in such a
notation or entry shall not, however, limit or otherwise affect any obligation
of the Company under this Agreement or the Notes.

                  (c) The Loans made by the Swingline Bank shall be evidenced by
a single promissory note (a "Swingline Note") of the Company substantially in
the form of Exhibit A-3 hereto, dated the Effective Date, payable to the
Swingline Bank in a principal amount equal to the amount of the Swingline
Commitment as originally in effect and otherwise duly completed. The date,
amount, type, interest rate and maturity date of each Swingline Loan made by the
Swingline Bank to the Company, and each payment made on account of the principal
thereof, shall be recorded by the Swingline Bank on its books and, prior to any
transfer of such Note held by it, endorsed by the Swingline Bank on the schedule
attached to such Note or any continuation thereof. The failure of the Swingline
Bank to make any notation or entry or any error in such a notation or entry
shall not, however, limit or otherwise affect any obligation of the Company
under this Agreement or the Notes.

                  II. PAYMENTS, INTEREST AND CERTAIN FEES

                  Section 2.01 Repayment of Loans. The Company hereby promises
to pay to Chase for account of each Bank, the principal amount of each Loan made
by such Bank (except for the Swingline Loan, as to which payments shall be made
to the Swingline Bank pursuant to Section 1.08), and such Loan shall mature, on
the last day of the Interest Period therefor.

                  Section 2.02 Interest. The Company hereby promises to pay to
Chase for account of each Bank, interest on the unpaid principal amount of each
Loan made by such Bank (except for the Swingline Loans, as to which payments
shall be made to the Swingline Bank pursuant to Section 1.08) for the period
from and including the date of such Loan to but excluding the date such Loan
shall be paid in full, at the following rates per annum:

                  (a) if such Loan is a Domestic Loan, the Base Rate (as in
         effect from time to time) plus the Applicable Margin (if any);

                  (b) if such Loan is a Eurodollar Loan, the Fixed Rate for such
         Loan for the Interest Period for such Loan plus the Applicable Margin
         (as in effect from time to time during the Interest Period for such
         Loan); and

                  (c) if such Loan is a Set Rate Loan, the Money Market Rate for
         such Loan for the Interest Period therefor quoted by the Bank making
         such Loan and accepted by the Company in accordance with Section 1.02
         hereof.

Notwithstanding the foregoing, the Company hereby promises to pay to Chase for
account of each Bank, interest at the applicable Post-Default Rate on any
principal of any Loan made by such Bank, and on any other amount payable by the
Company hereunder or under the Notes held 


                                       10
<PAGE>   15
by such Bank to or for account of such Bank, which shall not be paid in full
when due (whether at stated maturity, by acceleration or otherwise), for the
period from and including the due date thereof to but excluding the date the
same is paid in full. Accrued interest on each Loan shall be payable on each
Interest Payment Date for such Loan, except that interest payable at the
Post-Default Rate shall be payable from time to time on demand and interest on
any Eurodollar Loan that is converted into a Domestic Loan (pursuant to Section
3.04 hereof) shall be payable on the date of conversion (but only to the extent
so converted). Promptly after the determination of any interest rate provided
for herein or any change therein, Chase shall give notice thereof to the Banks,
to which such interest is payable and to the Company.

                  Section 2.03 Interest Periods. As used in this Agreement,
"Interest Period" shall mean:

                  (a) With respect to any Eurodollar Loan, the period commencing
         on the date such Eurodollar Loan is made and ending on the numerically
         corresponding day in the first, second, third or sixth calendar month
         thereafter, as the Company may select as provided in Section 1.05(b)
         hereof, except that each Interest Period which commences on the last
         Business Day of a calendar month (or on any day for which there is no
         numerically corresponding day in the appropriate subsequent calendar
         month) shall end on the last Business Day of the appropriate subsequent
         calendar month;

                  (b) With respect to any Domestic Loan, the period commencing
         on the date such Domestic Loan is made and ending on the date such Loan
         is repaid;

                  (c) With respect to any Set Rate Loan, the period commencing
         on the date such Set Rate Loan is made and ending on any Business Day
         up to 180 days thereafter, as the Company may select as provided in
         Section 1.02(b) hereof; and

                  (d) With respect to a Swingline Loan, the period commencing on
         the Swingline Business Day on which such Swingline Loan is made and
         ending on the date such Swingline Loan is repaid.

Notwithstanding the foregoing: (i) no Interest Period may commence before and
end after the Commitment Termination Date; (ii) each Interest Period which would
otherwise end on a day which is not a Business Day shall end on the next
succeeding Business Day (or, in the case of an Interest Period for Eurodollar
Loans, if such next succeeding Business Day falls in the next succeeding
calendar month, on the next preceding Business Day); and (iii) notwithstanding
clause (i) above, no Interest Period for any Eurodollar Loans shall have a
duration of less than one month and, if the Interest Period for any Eurodollar
Loans would otherwise be a shorter period, such Loans shall not be available
hereunder.

                  Section 2.04 Prepayments. (a) The Company shall have the
right, at any time or from time to time, to prepay Syndicated Loans in whole or
in part, provided that (i) the Company shall give Chase notice of each such
prepayment not less than three Business Days' prior to the date of such
prepayment (which notice shall be effective upon receipt), (ii) each partial
prepayment shall be in an aggregate principal amount which is at least
$1,000,000 or a multiple thereof, (iii) interest on the principal prepaid,
accrued to the prepayment date, shall be paid on the prepayment 


                                       11
<PAGE>   16
date and (iv) in the case of prepayment of a Eurodollar Loan other than on the
last day of the Interest Period applicable thereto, the Company shall pay
compensation, if any, due in accordance with Section 3.05(a) with respect
thereto. The Company may not prepay any Money Market Loans. Notwithstanding the
foregoing, upon not less than four Business Days' prior notice (which shall be
effective upon receipt) the Company may simultaneously prepay all Loans then
outstanding hereunder and terminate in whole the Commitments (in which case
interest on the principal prepaid, accrued to the prepayment date, together with
all other amounts owing hereunder, including without limitation under Section
3.05, shall be paid on such prepayment date).

                  (b) If, after giving effect to any termination or reduction of
the Commitment of any Bank pursuant to Section 1.04(a) or (b) hereof, the
outstanding aggregate principal amount of the Syndicated Loans held by such Bank
exceeds the amount of such Bank's Commitment, the Company shall prepay or pay
such Syndicated Loans (of a type to be designated by the Company by notice to
Chase not less than four Business Days prior to the date of such termination or
reduction and, failing such notice, such prepayment or repayment shall be
applied, first, to the outstanding Domestic Loans and, next, to the extent
necessary, to the outstanding Fixed Rate Loans with the fewest number of days
remaining in the Interest Periods therefor on such termination or reduction
date) in an aggregate principal amount equal to such excess, together with
interest thereon accrued to the date of such prepayment or payment and any other
amounts payable pursuant to Section 3.05 hereof in connection therewith.

                  Section 2.05 Payments, etc.

                  (a) Except to the extent otherwise provided herein, all
payments of principal, interest and other amounts to be made by the Company
under this Agreement and the Notes shall be made in Dollars, in immediately
available funds, without deduction, set-off or counterclaim, to Chase at its
Principal Office, not later than 11:00 a.m. New York time on the date on which
such payment shall become due; provided that, if a new Loan is to be made by any
Bank on a date the Company is to repay any principal of an outstanding Loan of
such Bank, such Bank shall apply the proceeds of such new Loan to the payment of
the principal to be repaid and only an amount equal to the difference (if any)
between the principal to be borrowed and the principal to be repaid shall be
made available by such Bank to Chase as provided in Section 1.02 or Section 1.05
hereof (if such principal to be borrowed exceeds such principal to be repaid) or
paid by the Company to Chase pursuant to this Section 2.05 (if such principal to
be repaid exceeds such principal to be borrowed).

                  (b) Each payment received by Chase under this Agreement or any
Note for account of a Bank shall be paid promptly to such Bank, in immediately
available funds, for account of such Bank's Applicable Lending Office for the
Loan in respect of which such payment is made.

                  (c) If the due date of any payment under this Agreement or any
Note would otherwise fall on a day which is not a Business Day (or, in the case
of any Swingline Loan or Swingline Note, a Swingline Business Day) such date
shall be extended to the next succeeding 


                                       12
<PAGE>   17
Business Day (or, in the case of any Swingline Loan or Swingline Note, the next
succeeding Swingline Business Day) and interest shall be payable for any
principal so extended for the period of such extension.

                  Section 2.06 Pro Rata Treatment; Sharing.

                  (a) Except to the extent otherwise provided herein: (i) each
borrowing from the Banks under Section 1.01 hereof shall be made from the Banks
and each termination or reduction of the amount of the Commitments under Section
1.04 hereof shall be applied to the Commitments of the Banks, pro rata according
to the amounts of their respective Commitments; (ii) each payment of principal
of Syndicated Loans by the Company shall be made for account of the Banks pro
rata in accordance with the respective unpaid principal amounts of the
Syndicated Loans held by the Banks; and (iii) each payment of interest on
Syndicated Loans by the Company shall be made for account of the Banks pro rata
in accordance with the amounts of interest on Syndicated Loans due and payable
to the respective Banks.

                  (b) If any Bank shall obtain payment of any principal of or
interest on any Loan made by it to the Company under this Agreement through the
exercise of any right of set-off, banker's lien or counterclaim or similar right
or otherwise, and, as a result of such payment, such Bank shall have received a
greater percentage of the principal or interest then due to such Bank hereunder
than the percentage received by any other Banks, it shall promptly purchase from
such other Banks participations in (or, if and to the extent specified by such
Bank, direct interests in) the Loans made by such other Banks (or in interest
due thereon, as the case may be) in such amounts, and make such other
adjustments from time to time as shall be equitable, to the end that all the
Banks shall share the benefit of such excess payment (net of any expenses which
may be incurred by such Bank in obtaining or preserving such excess payment) pro
rata in accordance with the unpaid principal of and/or interest on the Loans
held by each of the Banks before giving effect to such payment. To such end all
the Banks shall make appropriate adjustments among themselves (by the resale of
participations sold or otherwise) if such payment is rescinded or must otherwise
be restored.

                  (c) The Company agrees that any Bank so purchasing a
participation (or direct interest) in the Loans made by other Banks (or in
interest due thereon, as the case may be) may exercise all rights of set-off,
bankers' lien, counterclaim or similar rights with respect to such participation
as fully as if such Bank were a direct holder of Loans in the amount of such
participation.

                  (d) Nothing contained herein shall require any Bank to
exercise any such right or shall affect the right of any Bank to exercise, and
retain the benefits of exercising, any such right with respect to any other
indebtedness or obligation of the Company.

                  (e) If, under any applicable bankruptcy, insolvency or other
similar law, any Bank receives a secured claim in lieu of a set-off to which
this Section 2.06 applies, such Bank shall, to the extent practicable, exercise
its rights in respect of such secured claim in a manner consistent with the
rights of the Banks entitled under this Section 2.06 to share in the benefits of
any recovery on such secured claim.


                                       13
<PAGE>   18
                  (f) Notwithstanding the foregoing, this Section 2.06 shall not
be applicable to the Swingline Bank with respect to Swingline Loans.

                  Section 2.07 Computations. Interest on Money Market Loans and
Eurodollar Loans shall be computed on the basis of a year of 360 days and actual
days elapsed (including the first day but excluding the last day) occurring in
the period for which payable, and interest on Domestic Loans, Swingline Loans
and facility fees shall be computed on the basis of a year of 365 or 366 days,
as the case may be, and actual days elapsed (including the first day but
excluding the last day) occurring in the period for which payable.

                  Section 2.08 Facility Fee. The Company shall pay to Chase for
account of each Bank a facility fee on such Bank's Commitment (whether used or
not) for the period commencing on the Effective Date and ending on the
Commitment Termination Date (or such earlier date on which such Bank's
Commitment shall have terminated in full pursuant to Section 1.04 hereof) at a
rate per annum for each day during such period equal to the Applicable Facility
Fee Rate in effect on such day. Accrued facility fees shall be payable quarterly
on the last Business Day in March, June, September and December in each year,
commencing the first such date after the Effective Date and on the date the
Commitments are terminated in full.

                  Section 2.09 Administration Fee. The Company agrees to pay to
Chase for its own account a non-refundable fee in the amount of $5,000 for each
Quarterly Period commencing on or prior to the date on which the Commitments are
terminated in full. Such fee shall not be pro-rated and shall be paid in arrears
on the last Business Day of each Quarterly Period in each year, commencing with
the first such Business Day after the Effective Date, and on the date the
Commitments are terminated in full.

                  III. PROVISIONS RELATING TO FIXED RATE LOANS. The following
provisions shall apply to all Fixed Rate Loans:

                  Section 3.01 Additional Costs.

                  (a) The Company shall pay directly to each Bank from time to
time on request pursuant to paragraph (d) of this Section 3.01 such amounts as
such Bank may determine to be necessary to compensate it for any costs which
such Bank determines are attributable to its making or maintaining of any Fixed
Rate Loans or its obligation to make any Fixed Rate Loans hereunder, or any
reduction in any amount receivable by such Bank hereunder in respect of any of
such Loans or such obligation (such increases in costs and reductions in amounts
receivable being herein called "Additional Costs"), resulting from any
Regulatory Change which:

                           (i)      changes the basis of taxation of any amounts
         payable to such Bank under this Agreement or its Notes in respect of
         any of such Loans (other than taxes imposed on or measured by the
         overall net income of such Bank or of its Applicable Lending Office for
         any of such Loans by the jurisdiction in which such Bank has its
         principal office or such Applicable Lending Office); or


                                       14
<PAGE>   19
                           (ii)     imposes or modifies any reserve, special
         deposit or similar requirements (other than in the case of any Bank for
         any period as to which the Company is required to pay any amount under
         paragraph (e) below, the reserves against "Eurocurrency liabilities"
         under Regulation D therein referred to) relating to any extensions of
         credit or other assets of, or any deposits with or other liabilities
         of, such Bank (including any of such Loans or any deposits referred to
         in the definition of "Fixed Base Rate" in Schedule 1 hereof), or any
         commitment of such Bank (including the Commitment of such Bank
         hereunder); or

                           (iii)    imposes any other condition affecting this
         Agreement or its Notes (or any of such extensions of credit or
         liabilities) or its Commitment.

If any Bank requests compensation from the Company under this Section 3.01(a),
the Company may, by notice to such Bank (with a copy to Chase), suspend the
obligation of such Bank to make additional Loans of the type with respect to
which such compensation is requested (in which case the provisions of Section
3.04 hereof shall be applicable) until either (A) the Regulatory Change giving
rise to such request ceases to be in effect or (B) such Bank gives notice to the
Company that it will no longer require the Company to pay Additional Costs
arising from such Regulatory Change.

                  (b) Without limiting the effect of the provisions of paragraph
(a) of this Section 3.01, in the event that, by reason of any Regulatory Change,
any Bank either (i) incurs Additional Costs based on or measured by the excess
above a specified level of the amount of a category of deposits or other
liabilities of such Bank which includes deposits by reference to which the
interest rate on Eurodollar Loans is determined as provided in this Agreement or
a category of extensions of credit or other assets of such Bank which includes
Eurodollar Loans or (ii) becomes subject to restrictions on the amount of such a
category of liabilities or assets which it may hold, then, if such Bank so
elects by notice to the Company (with a copy to Chase), the obligation of such
Bank to make additional Loans of such type hereunder shall be suspended until
such Regulatory Change ceases to be in effect (in which case the provisions of
Section 3.04 hereof shall be applicable).

                  (c) Without limiting the effect of the foregoing provisions of
this Section 3.01 (but without duplication), the Company shall pay directly to
each Bank from time to time on request pursuant to paragraph (d) of this Section
3.01 such amounts as such Bank may determine to be necessary to compensate such
Bank for any costs which it determines are attributable to the maintenance by
such Bank (or any Applicable Lending Office), pursuant to any law or regulation
or any interpretation, directive or request (whether or not having the force of
law) of any court or governmental or monetary authority (i) following any
Regulatory Change or (ii) implementing any risk-based capital guideline or
requirement (whether or not having the force of law and whether or not the
failure to comply therewith would be unlawful) heretofore or hereafter issued by
any government or governmental or supervisory authority implementing at the
national level the Basle Accord (including, without limitation, the Final Risk
Based Capital Guidelines of the Board of Governors of the Federal Reserve System
(12 CFR Part 208, Appendix A; 12 CFR Part 225, Appendix A) and the Final
Risk-Based Capital Guidelines of the Office of the Comptroller 


                                       15
<PAGE>   20
of the Currency (12 CFR Part 3, Appendix A)), of capital in respect of its
Commitment or Loans (such compensation to include, without limitation, an amount
equal to any reduction of the rate of return on assets or equity of such Bank
(or any Applicable Lending Office) to a level below that which such Bank (or any
Applicable Lending Office) could have achieved but for such law, regulation,
interpretation, directive or request). For purposes of this Section 3.01(c),
"Basle Accord" shall mean the proposals for risk-based capital framework
described by the Basle Committee on Banking Regulations and Supervisory
Practices in its paper entitled "International Convergence of Capital
Measurement and Capital Standards" dated July 1988, as amended, modified and
supplemented and in effect from time to time or any replacement thereof.

                  (d) Each Bank will notify the Company of any event occurring
after the date of this Agreement that will entitle such Bank to compensation
under paragraph (a) or (c) of this Section 3.01 as promptly as practicable, but
in any event within 90 days, after such Bank obtains actual knowledge thereof;
provided, however, that if any Bank fails to give such notice within 90 days
after it obtains actual knowledge of such an event, such Bank shall, with
respect to compensation payable pursuant to this Section 3.01 in respect of any
costs resulting from such event, only be entitled to payment under this Section
3.01 for costs incurred from and after the date 90 days prior to the date that
such Bank does give such notice; and provided, further, that each Bank will
designate a different Applicable Lending Office for the Loans of such Bank
affected by such event or by the matters requiring compensation pursuant to
paragraph (e) of this Section 3.01, and take other measures in its sole
discretion, if such designation or other measures will avoid the need for, or
reduce the amount of, such compensation and will not, in the sole opinion of
such Bank, result in a material cost to, or be otherwise disadvantageous to,
such Bank, except that such Bank shall have no obligation to designate an
Applicable Lending Office located in the United States of America. Each Bank
will furnish to the Company a certificate setting forth the basis and amount of
each request by such Bank for compensation under paragraph (a) or (c) of this
Section 3.01. Determinations and allocations by any Bank for purposes of this
Section 3.01 of the effect of any Regulatory Change pursuant to paragraph (a) or
(b) of this Section 3.01, or of the effect of capital maintained pursuant to
paragraph (c) of this Section 3.01, on its costs or rate of return of
maintaining Loans or its obligation to make Loans, or on amounts receivable by
it in respect of Loans, and of the amounts required to compensate such Bank
under this Section 3.01, shall be conclusive, provided that such determinations
and allocations are made on a reasonable basis.

                  (e) Without limiting the effect of the foregoing (but without
duplication), the Company shall pay to each Bank on the last day of each
Interest Period so long as such Bank is maintaining reserves against
"Eurocurrency liabilities" under Regulation D (or, unless the provisions of
paragraph (b) above are applicable, so long as such Bank is, by reason of any
Regulatory Change, maintaining reserves against any other category of
liabilities which includes deposits by reference to which the interest rate on
Eurodollar Loans is determined as provided in this Agreement or against any
category of extensions of credit or other assets of such Bank which includes any
Eurodollar Loans) an additional amount (determined by such Bank and notified,
not less than five Business Days prior to the end of the applicable Interest
Period, to the Company through Chase) equal to the product of the following for
each Eurodollar Loan made by such Bank for each day during such Interest Period:


                                       16
<PAGE>   21
                           (i)      the principal amount of such Eurodollar Loan
         outstanding on such day; and

                           (ii)     the remainder of (x) a fraction the
         numerator of which is the annual rate (expressed as a decimal) at which
         interest accrues on such Eurodollar Loan for such Interest Period as
         provided in this Agreement (less the Applicable Margin) and the
         denominator of which is one minus the effective annual rate (expressed
         as a decimal) at which such reserve requirements are imposed on such
         Bank on such day minus (y) such numerator; and

                           (iii)    1/360.

                  Section 3.02 Limitation on Types of Loans. Anything herein to
the contrary notwithstanding, if, on or prior to the determination of any Fixed
Base Rate for any Interest Period in accordance with the terms hereof:

                  (a) Chase determines, which determination shall be conclusive,
         that quotations of interest rates for the relevant deposits referred to
         in the definition of "Fixed Base Rate" in Schedule 1 hereof are not
         being provided in the relevant amounts or for the relevant maturities
         for purposes of determining rates of interest for any type of Fixed
         Rate Loans as provided herein; or

                  (b) the Majority Banks determine, which determination shall be
         conclusive, and notify (or notifies, as the case may be) Chase that the
         relevant rates of interest referred to in the definition of "Fixed Base
         Rate" in Schedule 1 hereof upon the basis of which the rate of interest
         for Eurodollar Loans for such Interest Period is to be determined are
         not likely adequately to cover the cost to such Banks (or to such
         quoting Bank) of making or maintaining such type of Loans;

then Chase shall give the Company and each Bank prompt notice thereof, and so
long as such condition remains in effect, the Banks (or such quoting Bank) shall
be under no obligation to make additional Loans of such type.

                  Section 3.03 Illegality. Notwithstanding any other provision
of this Agreement, in the event that it becomes unlawful for any Bank or its
Applicable Lending Office to honor its obligation to make or maintain Eurodollar
Loans hereunder, then such Bank shall promptly notify the Company thereof (with
a copy to Chase) and such Bank's obligation to make Eurodollar Loans shall be
suspended until such time as such Bank may again make and maintain Eurodollar
Loans (in which case the provisions of Section 3.04 hereof shall be applicable).

                  Section 3.04 Treatment of Affected Loans. If the obligation of
any Bank to make a particular type of Fixed Rate Loans shall be suspended
pursuant to Section 3.01 or Section 3.03 hereof (Loans of such type being herein
called "Affected Loans" and such type being herein called the "Affected Type"),
all Loans (other than Money Market Loans) which would otherwise be made by such
Bank as Loans of the Affected Type shall be made instead as Domestic Loans and,
if an event referred to in Section 3.01(b) or Section 3.03 hereof has occurred
and such Bank so requests by notice to 


                                       17
<PAGE>   22
the Company with a copy to Chase, all Affected Loans of such Bank then
outstanding shall be automatically converted into Domestic Loans on the date
specified by such Bank in such notice and, to the extent that Affected Loans are
so made (or converted), all payments of principal which would otherwise be
applied to such Bank's Affected Loans shall be applied instead to such Loans.

                  Section 3.05 Compensation. The Company shall pay to Chase for
account of each Bank, upon the request of such Bank through Chase, such amount
or amounts (the basis for which shall be set forth in reasonable detail in such
request) as shall be sufficient (in the reasonable opinion of such Bank) to
compensate it for any loss, cost or expense which such Bank determines is
attributable to:

                  (a) any payment or conversion of a Fixed Rate Loan or a Set
         Rate Loan made by such Bank for any reason (including, without
         limitation, the acceleration of the Loans pursuant to Article VII
         hereof) on a date other than the last day of the Interest Period for
         such Loan; or

                  (b) any failure by the Company for any reason (including,
         without limitation, the failure of any of the conditions precedent
         specified in Article IV hereof to be satisfied, but excluding the
         failure of such Bank to make a Loan when so obligated hereunder) to
         borrow a Fixed Rate Loan or a Set Rate Loan (with respect to which, in
         the case of a Money Market Loan, the Company has accepted a Money
         Market Quote) from such Bank on the date for such borrowing specified
         in the relevant notice of borrowing given pursuant to Section 1.05 or
         Section 1.02 hereof.

Without limiting the effect of the preceding sentence, such compensation shall
include an amount equal to the excess, if any, of (i) the amount of interest
which otherwise would have accrued on the principal amount so paid or converted
or not borrowed for the period from the date of such payment, conversion or
failure to borrow to the last day of the Interest Period for such Loan (or, in
the case of a failure to borrow, the Interest Period for such Loan which would
have commenced on the date specified for such borrowing) at the applicable rate
of interest for such Loan provided for herein minus the Applicable Margin for
such Loan over (ii) the interest component of the amount such Bank would have
bid in the London interbank market (if such Loan is a Eurodollar Loan) or the
United States secondary certificate of deposit market (if such Loan is a Set
Rate Loan) for Dollar deposits of leading banks in amounts comparable to such
principal amount and with maturities comparable to such period (as reasonably
determined by such Bank).

                  Section 3.06 Survival. The obligations of the Company under
this Article III shall survive the repayment of the Loans and the cancellation
of the Notes.

                  IV. CONDITIONS

                  Section 4.01 Conditions to Effectiveness. The Agreement herein
contemplated shall become effective on the date (the "Effective Date") on which
Chase has received each of the 


                                       18
<PAGE>   23
following documents (with a copy for each Bank delivered to Chase), in form and
substance satisfactory to Chase:

                           (i)      one or more counterparts of this Agreement
         executed by each of the parties hereto;

                           (ii)     certified copies of all corporate action
         taken by the Company to authorize the execution and delivery of this
         Agreement and the Notes and the borrowings hereunder;

                           (iii)    a certificate of a duly authorized officer
         of the Company as to the incumbency, and setting forth a specimen
         signature, of each of the persons (a) who has signed this Agreement on
         behalf of the Company, (b) who will sign the Notes on behalf of the
         Company, and (c) who will, until replaced by other persons duly
         authorized for that purpose, act as the representatives of the Company
         for the purpose of signing documents in connection with this Agreement
         and the transactions contemplated hereby;

                           (iv)     the Syndicated Note and the Money Market
         Note for each Bank and the Swingline Note for the Swingline Bank, all
         as provided in Section 1.10 hereof, in each case duly completed and
         executed by the Company;

                           (v)      an opinion of Hughes Hubbard & Reed LLP,
         counsel for the Company, substantially in the form of Exhibit B hereto,
         which (except as to matters of New York or Federal law) may rely as to
         certain matters upon an opinion of the Executive Vice President and
         General Counsel of the Company substantially in the form attached to
         said Exhibit B;

                           (vi)     an opinion of Simpson Thacher & Bartlett,
         special counsel to the Banks and the Agents, substantially in the form
         of Exhibit C hereto; and

                           (vii)    such other statements, documents, reports or
         certificates as any Bank or Agent may reasonably request.

                  Section 4.02 Conditions Precedent to Loans. The obligation of
any Bank to make any Loan hereunder (including any Money Market Loan and such
Bank's initial Syndicated Loan on or after the Effective Date) is subject to the
further conditions precedent that, both immediately prior to such Loan and also
after giving effect thereto: (a) either (i) if such borrowing is a Money Market
Loan or will increase the outstanding aggregate principal amount of the
Syndicated Loans, no Default shall have occurred and be continuing or (ii) in
the case of any other borrowing, no Event of Default shall have occurred and be
continuing; and (b) the representations and warranties made by the Company in
Article VI (other than, if such borrowing is not a Money Market Loan and will
not increase the outstanding aggregate principal amount of the Syndicated Loans,
the last sentence of Section 6.03, Section 6.04, Section 6.05, Section 6.07,
Section 6.09 and Section 6.11 hereof) shall be true on and as of the date of the
notice or deemed notice of borrowing for such Loans and on the date of the
making of such Loans with the same force and effect as if made on and as of each
such date. The obligation of any Bank to make a Eurodollar Loan hereunder is
subject to 


                                       19
<PAGE>   24
the further condition precedent that, both immediately prior to such Loan and
also after giving effect thereto, no Default shall have occurred and be
continuing. Each notice or deemed notice of borrowing by the Company hereunder
shall constitute a certification by the Company to the effect set forth in the
two preceding sentences to the extent applicable to the borrowing that is the
subject of such notice (both as of the date of such borrowing notice and, unless
the Company otherwise notifies Chase in such borrowing notice or prior to the
date of such borrowing, as of the date of such borrowing).

                  V. COVENANTS. So long as any Loan or any other amount owing by
the Company to any Agent or Bank hereunder remains outstanding or any Bank's
Commitment remains in effect:

                  Section 5.01 Financial Statements. The Company shall deliver
to each Bank:

                  (a) As soon as available and in any event within 60 days after
         the end of each of the first three quarterly accounting periods in each
         fiscal year, the 10-Q report of the Company for such period;

                  (b) As soon as available and in any event within 120 days
         after the end of each fiscal year, the 10-K report of the Company for
         such fiscal year, accompanied by (A) an opinion as to the financial
         statements contained in such 10-K report of independent certified
         public accountants of recognized national standing, (B) a statement by
         said accountants that in the course of their regular examination of the
         Company and its Consolidated Subsidiaries for purposes of their opinion
         they obtained no knowledge, except as specifically stated, of the
         occurrence and continuance of any Default, and (C) a statement of an
         Appropriate Officer of the Company that such officer has no knowledge,
         except as specifically stated, of the occurrence and continuance of any
         Default.

                  (c) With the report delivered under Section 5.01(b) hereof, a
         statement signed by an Appropriate Officer of the Company certifying
         and, where calculations are necessary, demonstrating compliance by the
         Company with the provisions of Section 5.09 hereof.

                  (d) Promptly after their becoming available:

                           (i)      Copies of all financial statements, reports
         and proxy statements which the Company shall have sent to its
         stockholders generally.

                           (ii)     Copies of all regular and periodic reports,
         if any, which the Company or any Restricted Subsidiary shall have filed
         with the Securities and Exchange Commission, or any governmental agency
         substituted therefor, or with any national securities exchange.

                           (e)      From time to time, with reasonable
         promptness, such further information regarding the business, affairs
         and financial position of the Company and each Subsidiary as any Bank
         may reasonably request.


                                       20
<PAGE>   25
                  Section 5.02 Access to Books and Inspection. The Company
shall, upon reasonable request by any Bank, give any representative of such Bank
access, at the Company's principal office, during normal business hours to, and
permit such representative to examine, copy or make excerpts from, any and all
books, records and documents in the possession of the Company relating to its
affairs and the affairs of its Subsidiaries, excluding, however, any privileged
and confidential communications or other materials, and to inspect any of the
properties of the Company or such Subsidiaries; provided that all information
(other than publicly available information) delivered by the Company to any Bank
pursuant to this Section 5.02 is strictly confidential, and each Bank agrees
that it shall (or shall cause the persons referred to in clause (ii) below to)
maintain the confidentiality of any such information, subject to: (i) the
obligation to disclose such information pursuant to subpoena or other legal
process, or to regulatory or examining authorities or other governmental
agencies having jurisdiction, or otherwise as may be required by law; (ii) the
right to disclose such information to the independent auditors and counsel of
such Bank, or to the Agents or any other Bank; and (iii) the right to disclose
such information to assignees and participants (including prospective assignees
and participants) as provided in Section 8.05 hereof.

                  Section 5.03 Litigation. Notwithstanding any other provision
of this Agreement, the Company shall, promptly after its becoming available,
furnish to each Bank a copy of any report filed by the Company with the
Securities and Exchange Commission which contains a statement, description or
disclosure as to any litigation or proceeding before any governmental or
regulatory agencies affecting the Company or any of its Subsidiaries.

                  Section 5.04 Maintenance of Existence. The Company will
preserve and maintain, and cause each of its Restricted Subsidiaries to preserve
and maintain, its corporate existence, provided that the foregoing shall not
prevent a merger or consolidation, or sale or other disposition of assets, of
the Company or any Restricted Subsidiary unless otherwise prohibited by this
Agreement.

                  Section 5.05 Merger; Sale of Assets. The Company shall not:

                  (a) merge into or consolidate with any corporation if (i) the
         Company is not the surviving corporation, (ii) the Company is the
         surviving corporation and a majority of the board of directors of the
         Company for a period of three months after the effective date of such
         merger does not consist of individuals who were directors of the
         Company 12 months prior to such effective date (except for changes due
         to the retirement or death of any such individuals) or (iii) after
         giving effect to such merger or consolidation, a Default has occurred
         and is continuing; or

                  (b) permit any Restricted Subsidiary to be a party to any
         merger or consolidation or to transfer all or substantially all of its
         assets, except that any such Restricted Subsidiary may merge or
         consolidate with, or transfer all or substantially all of its assets
         to, the Company or any of the Company's other Subsidiaries provided
         that (i) the surviving entity of such merger or consolidation or the
         transferee of such assets (if it is not the Company or another
         Restricted Subsidiary) shall thereafter be treated as a 


                                       21
<PAGE>   26
         Restricted Subsidiary for all purposes of this Agreement and (ii) after
         giving effect to such merger, consolidation or transfer of assets, no
         Default shall have occurred and be continuing; or

                  (c) sell, assign, transfer or otherwise dispose of all or
         substantially all of its assets or, in any case, any stock of or other
         equity interest in any of the Restricted Subsidiaries, except that (i)
         stock of or other equity interest in any such Restricted Subsidiary may
         be sold, assigned or transferred by the Company to any of its
         wholly-owned Subsidiaries provided that thereafter such Subsidiary
         shall be treated as a Restricted Subsidiary for all purposes of this
         Agreement and the Company shall not permit such Subsidiary to sell,
         assign, transfer or otherwise dispose of any such stock or other equity
         interest except to the Company or otherwise in accordance with this
         clause (c), (ii) stock of or other equity interest in any Restricted
         Subsidiary may be sold, assigned, transferred or disposed of (whether
         by the Company or any of its wholly-owned Subsidiaries) so long as
         immediately after giving effect to such transaction the Company and/or
         one or more of its wholly-owned Subsidiaries owns stock of or other
         equity interests in such Restricted Subsidiary (x) representing, in the
         case of a partnership, not less than 80% of the outstanding capital and
         profit interests in such partnership or, in the case of any other
         entity, not less than 80% of the fair market value of the outstanding
         stock of or other equity interests in such Restricted Subsidiary
         (excluding Mandatory Preferred Stock of such Restricted Subsidiary) and
         (y) representing not less than 80% of the ordinary voting power for the
         election of directors or other persons performing similar functions of
         such Restricted Subsidiary (other than stock or other equity interests
         having such power only by reason of the happening of a contingency) and
         (iii) Mandatory Preferred Stock of any Restricted Subsidiary may be
         sold, assigned, transferred or disposed of (whether by the Company or
         any of its Subsidiaries).

                  Section 5.06 Default; Investment Rating. The Company shall:

                  (a) as soon as it shall become known to a senior officer of
         the Company, forthwith notify each Agent if any Default shall have
         occurred; and

                  (b) if Moody's or S&P (or any successor thereto) shall have
         assigned a new rating to the senior debt securities of the Company,
         notify each Agent of such new rating within 30 days after it is first
         announced by the applicable rating agency.

                  Section 5.07 ERISA. The Company will furnish to the Banks:

                  (a) as soon as possible and in any event within 15 days after
         the Company knows or has reason to know that any Termination Event has
         occurred, a statement of a senior officer of the Company describing
         such Termination Event and the action, if any, which the Company
         proposes to take with respect thereto;

                  (b) from time to time promptly after the request of any Bank,
         copies of each annual report filed pursuant to Section 104 of ERISA
         with respect to each Plan (including, to the extent required by Section
         103 of ERISA, the related financial and 


                                       22
<PAGE>   27
         actuarial statements and opinions and other supporting statements,
         certifications, schedules and information referred to in Section 103)
         and each annual report filed with respect to each Plan under Section
         4065 of ERISA;

                  (c) promptly after receipt thereof by the Company from the
         PBGC, copies of each notice received by the Company of PBGC's intention
         to terminate any Plan or to have a trustee appointed to administer any
         Plan; and

                  (d) promptly after such request, such other documents and
         information relating to Plans as any Bank may reasonably request from
         time to time.

                  Section 5.08 Liens. The Company will not, and will not permit
any Subsidiary to, grant a security interest in any stock of any of the
Restricted Subsidiaries or Citrus Corp. The Company will not grant a security
interest in any of its other assets to secure Indebtedness (except as provided
in the next sentence) unless the Company simultaneously grants to any Designated
Agent for the benefit of the Banks an equal and ratable security interest in the
assets subject to such security interest. The provisions of the preceding
sentence shall not apply to the grant by the Company of:

                  (a) Any purchase money mortgage or purchase money security
         interest created to secure all or part of the purchase price of any
         property (or to secure a loan made to enable the Company to acquire the
         property described in such mortgage or in any applicable security
         agreement); provided that such mortgage or security interest shall
         extend only to the property so acquired, fixed improvements thereon,
         replacements thereof and the income and profits therefrom;

                  (b) Any security interest on any property acquired or
         constructed by the Company, and created not later than twelve months
         after (i) such acquisition or completion of such construction or (ii)
         commencement of operation of such property, whichever is later;
         provided that such security interest shall extend only to the property
         so acquired or constructed, fixed improvements thereon, replacements
         thereof and income and profits therefrom;

                  (c) Any security interest deemed to be created as a result of
         the deposit of cash or securities for the purpose of defeasance of
         Indebtedness; and

                  (d) Any security interest in any of its cash or cash
         equivalents (within the meaning of generally accepted accounting
         principles) created by the Company for the purpose of securing
         Derivative Obligations of the Company, provided that the aggregate
         amount of all cash or cash equivalents secured by security interests
         permitted by this clause (d) shall not exceed $25,000,000.

                  (e) Any security interest not otherwise permitted under the
         preceding clauses (a) through (d) in any of its assets created by the
         Company for the purpose of securing Indebtedness of the Company,
         provided that the aggregate amount of all Indebtedness of 


                                       23
<PAGE>   28
         the Company secured by security interests permitted by this clause (e)
         shall not exceed $10,000,000.

                  Section 5.09 Total Indebtedness to Consolidated
Capitalization. The Company will not at any time permit Total Indebtedness of
the Company to exceed 65% of the Consolidated Capitalization of the Company.

                  Section 5.10 Certain Existing Credit Lines. The Company will
terminate its eleven bilateral credit lines in existence as of the date of this
Agreement, which provide for borrowings of up to $200 million in the aggregate,
within 30 days after the Effective Date, and will not make any borrowings
thereunder from and after the Effective Date.

                  Section 5.11 Insurance. The Company will, and will cause each
of its Subsidiaries to, keep insured with financially sound and reputable
insurers or through self-insurance conforming with practices of similar
corporations maintaining systems of self-insurance all property of a character
usually insured by corporations engaged in the same or similar business
similarly situated against loss or damage of the kinds and in the amounts
customarily insured against by such corporations and carry such other insurance
as is usually carried by such corporations.

                  Section 5.12 Maintenance of Properties. The Company will, and
will cause each of its Subsidiaries to, keep all of its material properties
necessary in its business in good working order and condition appropriate for
the use being made thereof, ordinary wear and tear excepted; except, in every
case, as and to the extent that the Company or its Subsidiaries may be prevented
from maintaining their respective properties by fire, strikes, lockouts, acts of
God, inability to obtain labor or materials, governmental (including judicial)
restrictions, enemy action, civil commotion or unavoidable casualty or similar
causes beyond the control of the Company; provided, however, that nothing in
this Section 5.12 shall prevent the Company or any of its Subsidiaries from
discontinuing the use, operation or maintenance of any of such properties if
such discontinuance is, in the judgment of the Company or its applicable
Subsidiary, desirable in the conduct of the business of the Company or such
Subsidiary and if such discontinuance is not disadvantageous in any material
respect to the Banks; and provided, further, that nothing in this Section 5.12
shall prohibit any sale, assignment, transfer or other disposition permitted by
Section 5.05 hereof.

                  Section 5.13 Public Utility Holding Company Act. The Company
will not, and will not permit any of its Subsidiaries to, be subject to
regulation under the Public Utility Holding Company Act of 1935, as amended.

                  VI. REPRESENTATIONS AND WARRANTIES. The Company represents and
warrants as follows:

                  Section 6.01 Corporate Existence and Powers. The Company and
each of its Restricted Subsidiaries is a corporation duly incorporated and
validly existing and in good standing under the laws of the jurisdiction of its
incorporation (or, in case of any Restricted Subsidiary not a corporation, such
Restricted Subsidiary is duly organized and validly existing under the laws of
the jurisdiction of its organization) and is duly licensed or qualified to do
business and is in good standing in all states in which the Company believes the
conduct of its business or the ownership


                                       24
<PAGE>   29
of its assets requires such qualification, and the Company has corporate power
to make this Agreement and the Notes and to borrow hereunder.

                  Section 6.02 Corporate Authority, etc. The making and
performance by the Company of this Agreement and the Notes and each borrowing
hereunder have been duly authorized by all necessary corporate action and do not
and will not contravene any provision of law applicable to the Company or of the
certificate of incorporation or by-laws of the Company or result in the material
breach of, or constitute a material default or require any consent under, or
result in the creation of any material lien, charge or other security interest
or encumbrance not permitted by Section 5.08 hereof upon any property or assets
of the Company or any of its Restricted Subsidiaries pursuant to, any indenture
or other agreement or instrument to which the Company or any of its Restricted
Subsidiaries is a party or by which the Company or any of its Restricted
Subsidiaries or any of their respective properties may be bound or affected (or,
if any such consent is so required, the Company has obtained such consent, which
is sufficient for the purpose and remains in full force and effect, and copies
thereof have been furnished to Chase). This Agreement has been duly and validly
executed and delivered by the Company and constitutes, and each of the Notes
when executed and delivered will constitute, its legal, valid and binding
obligation, enforceable in accordance with its terms.

                  Section 6.03 Financial Condition. The consolidated balance
sheets of the Company and its Consolidated Subsidiaries as at December 31, 1996
and September 30, 1997 and the related statements of consolidated income and
cash flows of the Company and its Consolidated Subsidiaries for the 12 months
and nine months ended on said dates, respectively, heretofore furnished by the
Company to the Banks, fairly present in all material respects the financial
condition of the Company and its Consolidated Subsidiaries as at said dates and
the results of their operations and cash flows for the 12 months and nine
months, respectively, then ended in accordance with generally accepted
accounting principles (except that the financial statements as of September 30,
1997 and for the nine months then ended were prepared in accordance with the
rules of the Securities and Exchange Commission applicable to interim financial
statements and they are subject to normal year-end audit adjustments). Except as
disclosed in a letter dated January 26, 1998, from the Treasurer of the Company,
a copy of which has been furnished to each Bank, since December 31, 1996 there
has heretofore been no material adverse change in the financial condition or
operating results of the Company and its Consolidated Subsidiaries, taken as a
whole, from that set forth in the consolidated balance sheet and related
statements as at and for the period ended on said date.

                  Section 6.04 Litigation. Except as disclosed in a letter dated
January 26, 1998, from the Executive Vice President and General Counsel of the
Company, a copy of which has heretofore been furnished to each Bank, there are
no actions, suits or proceedings, and no proceedings before any arbitrator or by
or before any governmental commission, board, bureau or other administrative
agency, pending, or to the knowledge of the Company threatened, against or
affecting the Company or any Subsidiary which are reasonably likely to have a
material adverse effect on the financial condition, properties or operations of
the Company and its Subsidiaries, taken as a whole.


                                       25
<PAGE>   30
                  Section 6.05 Taxes. Each of the Company and each Restricted
Subsidiary has filed all material tax returns required to be filed and paid all
material taxes shown thereon to be due, including interest and penalties, or
provided adequate reserves for payment thereof, except to the extent the same
have become due and payable but are not yet delinquent, and except for any taxes
and assessments of which the amount, applicability or validity is currently
being contested in good faith by appropriate proceedings.

                  Section 6.06 Approvals. No approval, license or consent of any
governmental regulatory body is requisite to the making and performance by the
Company of this Agreement, or the execution, delivery and payment of the Notes
(or, if any such approval, license or consent is so requisite, the Company has
obtained the same, which is sufficient for the purpose and remains in full force
and effect, and copies thereof have been furnished to Chase).

                  Section 6.07 ERISA. The Company, and each Subsidiary, has met
its minimum funding requirements under ERISA with respect to all its Plans and
has not incurred any material liabilities to PBGC or to such Plan under ERISA in
connection with any such Plan.

                  Section 6.08 Margin Regulations. The Company is not engaged
principally, or as one of its important activities, in the business of extending
credit for the purpose of purchasing or carrying margin stock (within the
meaning of Regulation U or Regulation G of the Board of Governors of the Federal
Reserve System), and no part of the proceeds of any Loan will be used to
purchase or carry any such margin stock or to extend credit to others for the
purpose of purchasing or carrying any such margin stock.

                  Section 6.09 Certain Subsidiaries. Except as a consequence of
a transaction or transactions permitted by this Agreement, the Company directly
or indirectly owns all of the outstanding shares of common stock of each of the
Restricted Subsidiaries (except for directors' qualifying shares), and all
shares of stock of such corporations are validly issued, fully paid and
non-assessable.

                  Section 6.10 Investment Company Act. The Company is not an
"investment company" or a company "controlled" by an "investment company",
within the meaning of the Investment Company Act of 1940, as amended.

                  Section 6.11 Environmental Laws. The Company and its
Subsidiaries are in compliance in all material respects with the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, as amended, the
Superfund Amendments and Reauthorization Act of 1986, the Resource Conservation
and Recovery Act, the Toxic Substances Control Act, as amended, the Clean Air
Act, as amended, the Clean Water Act, as amended, and each other federal, state
or local statute, law, ordinance, code, rule or regulation, regulating or
imposing liability or standards of conduct concerning, any hazardous, toxic or
dangerous waste, substance or material, except for any noncompliance that is not
reasonably likely to have a material adverse effect on the financial condition,
properties or operations of the Company and its Subsidiaries, taken as a whole.


                                       26
<PAGE>   31
                  All representations and warranties made herein shall survive
the making of the Loans and the delivery of the Notes hereunder.

                  VII. EVENTS OF DEFAULT. If any of the following "Events of
Default" shall occur and shall not have been remedied:

                           A. default by the Company in the payment of any
                  principal of any of the Notes when the same becomes due and
                  payable;

                           B. default by the Company in the payment of interest
                  on any of the Notes or any other amounts payable under Section
                  1.03 or Section 2.08 hereof which shall remain unremedied for
                  ten days after the same becomes due and payable;

                           C. any representation or warranty made by the Company
                  in Article VI hereof or in any certificate furnished to the
                  Agents or to the Banks hereunder (or deemed to have been given
                  at the time of any borrowing hereunder) shall prove to have
                  been incorrect when made or deemed made, in any material
                  respect;

                           D. default by the Company in the due performance or
                  observance of Section 5.05, Section 5.08 or Section 5.09
                  hereof;

                           E. default by the Company in the due performance or
                  observance of Section 5.06(a) hereof which shall remain
                  unremedied for a period of ten days;

                           F. default by the Company in the due performance or
                  observance of Section 5.03 or Section 5.06(b) hereof which
                  shall remain unremedied for a period of 30 days after such
                  default shall have become known to an executive officer of the
                  Company;

                           G. default by the Company in the due performance or
                  observance of any other covenant or agreement herein contained
                  which shall remain unremedied for a period of 30 days after
                  written notice thereof shall have been given to the Company by
                  any Bank (through any Designated Agent);

                           H. default by the Company or any Restricted
                  Subsidiary (i) in the payment of any Indebtedness of the
                  Company and/or one or more Restricted Subsidiaries in an
                  aggregate unpaid principal amount of at least $25,000,000,
                  beyond the period or periods of grace (if any) provided with
                  respect thereto, or (ii) in the performance or observance of
                  any other provisions in indentures, credit or loan agreements
                  or other agreements or instruments under which such
                  Indebtedness in such aggregate unpaid principal amount of the
                  Company and/or one or more Restricted Subsidiaries is
                  outstanding or by which such Indebtedness is evidenced and, in
                  the case of clause (ii) only, if the effect of such default is
                  to cause, or permit the holder or holders of such Indebtedness
                  (or a trustee or an agent on behalf of such holder or holders)
                  to cause, such Indebtedness to become due prior to its stated
                  maturity;


                                       27
<PAGE>   32
                           I. any Termination Event shall have occurred and
                  shall have continued under circumstances which result in an
                  uninsured payment or repayment liability of the Company or any
                  of its Subsidiaries to PBGC in an amount which is material in
                  relation to the financial position of the Company and its
                  Subsidiaries, on a consolidated basis;

                           J. either the Company or one or more Restricted
                  Subsidiaries (taken as a group) with total assets of at least
                  $10,000,000 in the aggregate (such Restricted Subsidiary or
                  Subsidiaries being hereinafter called the "Restricted Group")
                  shall (1) apply for or consent to the appointment of, or
                  taking possession by, a receiver, trustee, custodian,
                  liquidator or other similar official of itself or of all or a
                  substantial part of its assets, (2) admit in writing its
                  inability to pay its debts, or generally become unable to pay
                  its debts, as they become due, (3) make a general assignment
                  for the benefit of its creditors, (4) commence a voluntary
                  case under the federal bankruptcy laws (as now or hereafter in
                  effect), (5) file a petition seeking to take advantage of any
                  other laws relating to bankruptcy, reorganization, insolvency,
                  winding-up or composition or readjustment of debts, or (6)
                  acquiesce in writing to, or fail to controvert in a timely and
                  appropriate manner, any petition filed against it or in any
                  involuntary case under the aforesaid federal bankruptcy laws;
                  or corporate action shall be taken by the Company or the
                  Restricted Group for the purpose of effecting any of the
                  foregoing; or

                           K. a proceeding or case shall be commenced, without
                  the application or consent of the Company or the Restricted
                  Group (as defined in paragraph J above), in any court of
                  competent jurisdiction, seeking (1) its liquidation,
                  reorganization, dissolution, winding-up, or composition or
                  readjustment of debts, (2) the appointment of a receiver,
                  trustee, custodian, liquidator or any similar official of
                  itself of all or a substantial part of its assets, (3) similar
                  action with respect to the Company or the Restricted Group
                  under the federal bankruptcy laws (as now or hereafter in
                  effect) or any other laws relating to bankruptcy, insolvency,
                  reorganization, liquidation or winding-up, or composition or
                  adjustment of debts, and such proceeding or case shall
                  continue undismissed, or an order, judgment or decree
                  approving or ordering any of the foregoing shall be entered
                  and continued unstayed and in effect, for any period of 60
                  consecutive days; or an order for relief against the Company
                  or the Restricted Group shall be entered in an involuntary
                  case under such federal bankruptcy laws,

THEREUPON, (in addition to the rights and remedies of the Swingline Bank
pursuant to Section 1.08(b)) (1) in the case of any of the Events of Default
specified in paragraphs A through I above, (i) any Designated Agent may and,
upon being directed so to do by the Majority Banks, shall, by notice to the
Company, terminate all Commitments hereunder and they shall thereupon terminate,
and (ii) any Designated Agent may and, upon being directed by Banks holding at
least 66-2/3% of the aggregate unpaid principal amount of the Loans shall, by
notice to the Company, declare all outstanding Loans and Notes and all other
obligations of the Company hereunder to be due and payable, whereupon the same
shall become forthwith due and payable, without 


                                       28
<PAGE>   33
further protest, presentment, notice or demand, all of which are expressly
waived by the Company, and (2) in case of any of the Events of Default specified
in paragraph J or K above, without any notice to the Company or any act by any
Designated Agent or the Majority Banks or any Bank, all Commitments hereunder
shall terminate forthwith and the principal of and interest accrued on all the
Loans and the Notes and all other obligations of the Company hereunder shall
become and be due and payable.

                  VIII. MISCELLANEOUS

                  Section 8.01 Waiver. No failure on the part of any Agent, Bank
or holder of a Note to exercise and no delay in exercising and no course of
dealing with respect to any right, power or privilege under this Agreement or
the Notes shall operate as a waiver thereof; nor shall any single or partial
exercise of any right, power, or privilege under this Agreement or the Notes
preclude any other or further exercise thereof or the exercise of any other
right, power, or privilege. The remedies herein provided are cumulative and not
exclusive of any remedies provided by law.

                  Section 8.02 Notices and Delivery of Documents. Except as
otherwise specified herein, all notices and other communications hereunder shall
be in writing or by telex or telecopy, and shall be deemed to have been duly
given when transmitted by telex or telecopier or personally delivered or, in the
case of a mailed notice or other communication, three Business Days after the
date deposited in the mails, certified and postage prepaid, addressed to any
party hereto at its address given on Schedule 2 hereto or on the signature pages
of, or any schedule to, any amendment hereto, or at such other address of which
any party hereto shall have notified in writing the party giving such notice or
(in the case of a telex message) addressed to any party at any telex number
which is published as belonging to the addressee. Except as otherwise expressly
provided herein, all Notes and other documents to be delivered to any Agent
under this Agreement shall be delivered to it at its Principal Office.

                  Section 8.03 Governing Law. This Agreement and the Notes
hereunder shall be construed in accordance with and governed by the law of the
State of New York.

                  Section 8.04 Offsets, etc. Upon the occurrence and during the
continuance of an Event of Default, each Bank is hereby authorized at any time
and from time to time, without notice to the Company except as required by law
(any such notice being expressly waived by the Company), to set off and apply
any and all deposits (general or special, time or demand, provisional or final)
at any time held and other indebtedness at any time owing by such Bank to or for
the credit or the account of the Company against any and all of the obligations
of the Company now or hereafter existing under this Agreement and the Notes held
by such Bank. Each Bank agrees promptly to notify the Company after any such
set-off and application made by such Bank, provided that the failure to give
such notice shall not affect the validity of such set-off and application. The
rights of the Banks under this Section 8.04 are in addition to other rights and
remedies (including, without limitation, other rights of set-off) which the
Banks may have.

                  Section 8.05 Disposition of Loans. Each Bank may at any time,
at its own expense, assign (but only with the prior written consent of the
Company, which it may refuse or grant in 


                                       29
<PAGE>   34
its sole discretion), or sell participations in, all or any portion of any Loans
made by it to another bank or other entity; provided that no such assignment
shall be in a principal amount less than $10,000,000. Any Bank making an
assignment hereunder shall pay to Chase an administrative fee of $2,500 with
respect to each assignment. In the case of an assignment, upon notice thereof by
such Bank to the Company and the Agents, to the extent of such assignment and
the Loans so assigned, the assignee shall have the same rights and benefits as
it would have if it were a Bank hereunder and the assignor shall cease to have
the rights and benefits of a Bank hereunder (provided that the obligations of
the Company under Article III to such Bank shall survive such assignment). In
the case of a participation, except as otherwise provided in Section 2.06(c)
hereof, the participant shall not have any rights under this Agreement or such
Bank's Notes (the participant's rights against such Bank in respect of such
participations to be those set forth in the agreement executed by such Bank in
favor of the participant relating thereto) and all amounts payable by the
Company under Article III hereof shall be determined as if such Bank had not
sold such participation. The granting of any such participation shall not
relieve the grantor of its Commitment hereunder. Each Bank may furnish any
information concerning the Company or any of its Subsidiaries in the possession
of such Bank from time to time to assignees and participants (including
prospective assignees and participants) under this Section 8.05, provided that,
if any such information is confidential information consisting of or based upon
information provided by the Company, prior to furnishing any such information
such Bank shall obtain the agreement of any such assignee or participant, in
favor of the Company, to maintain the confidentiality of such information,
subject to the same requirements and exceptions as specified in Section 5.02
hereof (and such Bank shall promptly furnish a copy of each such agreement to
the Company). Any Bank may at any time pledge or assign a security interest in
all or any portion of its rights under this Agreement to secure obligations of
such Bank to a Federal Reserve Bank, and this Section shall not apply to any
such pledge or assignment of a security interest; provided that no such pledge
or assignment of a security interest shall release a Bank from any of its
obligations hereunder or substitute any such pledgee or assignee for such Bank
as a party hereto.

                  Section 8.06 Expenses. All statements, reports, certificates,
opinions and other documents or information furnished by the Company to the
Agents or the Banks under this Agreement shall be supplied without cost to the
Agents or the Banks. Further, the Company hereby agrees that it shall pay, on
demand, whether or not any Loan is made hereunder, (a) all reasonable
out-of-pocket costs and expenses of the Banks and the Agents incurred in
connection with the preparation, execution and delivery of this Agreement, or
any amendment or supplement thereto, and the Notes and the making of the Loans
hereunder, (b) the reasonable fees and disbursements of Simpson Thacher &
Bartlett, special counsel to the Banks, in connection therewith, and (c) all
costs and expenses of collection (including, without limitation, reasonable
legal fees) incident to the enforcement, protection or preservation of any right
of any Bank under this Agreement or the Notes.

                  Section 8.07 Amendments, Waivers, etc. This Agreement and the
Notes may not be amended, supplemented or modified, nor any of its terms be
waived, except by written instruments signed by the Company and the Majority
Banks (and, in the case of any amendment, supplement, modification or waiver
affecting Article IX hereof, each of the Agents); provided, however, that no
such amendment, supplement, modification or waiver shall, without the written


                                       30
<PAGE>   35
consent of all of the Banks: (i) extend the term of, or change the amount of, or
change any of the provisions of Section 1.04 hereof with respect to the
reduction or increase of, the Commitment of any Bank, or change the rate at
which commitment or facility fees accrue hereunder or extend the time for
payment thereof, (ii) extend the maturity of any Loan, change the rate of
interest thereon, or affect in any way the terms of payment thereof, (iii) alter
the definition of "Majority Banks", (iv) affect any provisions relating to Fixed
Rate Loans, (v) alter this Section 8.07 or Section 8.09(a), (vi) waive any
condition specified in Article IV, (vii) waive an Event of Default under
paragraph J or K of Article VII or modify the effect thereof or (viii) waive or
amend any representation contained in Article VI; provided, further, that
Section 1.03 and Section 1.08 hereof may be amended, supplemented or modified,
and any of the terms thereof waived, by written instrument signed only by the
Company and the Swingline Bank. Any such amendment, supplement, modification or
waiver so entered into shall apply equally to all of the Banks and any holder of
the Notes and shall be binding upon all parties hereto. Any waiver hereunder
shall be for such period and subject to such conditions as shall be specified in
such written instrument. In the case of any waiver of an Event of Default, such
Event of Default shall be deemed to be cured and not continuing, but no such
waiver shall extend to any subsequent or other Event of Default or any right,
power or privilege of the Banks hereunder in connection therewith.

                  Section 8.08 Definitions. Certain terms are defined in
Schedule 1 hereto and as used herein shall have meanings as so defined.

                  Section 8.09 Successors and Assigns. (a) This Agreement shall
be binding upon and inure to the benefit of the Banks, the Agents, the Company
and their respective successors and assigns, except that Company may not assign
or transfer any of its respective rights or obligations hereunder without the
prior written consent of all the Banks.

                  (b) Notwithstanding anything to the contrary contained herein,
any Bank (a "Granting Lender") may grant to a special purpose funding vehicle
(an "SPC") of such Granting Lender, identified as such in writing from time to
time by the Granting Lender to the Agents and the Company, the option to provide
to the Company all or any part of any Loan that such Granting Lender would
otherwise be obligated to make to the Borrower pursuant to Section 1.01 or 1.02,
provided that (i) nothing herein shall constitute a commitment to make any Loan
by any SPC and (ii) if an SPC elects not to exercise such option or otherwise
fails to provide all or any part of such Loan, the Granting Lender shall be
obligated to make such Loan pursuant to the terms hereof. The making of a
Syndicated Loan by an SPC hereunder shall utilize the Commitment of the Granting
Lender to the same extent, and as if, such Loan were made by the Granting
Lender. Each party hereto hereby agrees that no SPC shall be liable for any
payment under this Agreement for which a Bank would otherwise be liable, for so
long as, and to the extent, the related Granting Lender makes such payment. In
furtherance of the foregoing, each party hereto hereby agrees that, prior to the
date that is one year and one day after the later of (i) the payment in full of
all outstanding senior indebtedness of any SPC and (ii) the Commitment
Termination Date, it will not institute against, or join any other person in
instituting against, such SPC any bankruptcy, reorganization, arrangement,
insolvency or liquidation proceedings or similar proceedings under the laws of
the United States or any State thereof. In addition, notwithstanding anything to
the contrary contained in this Section 8.09(b), any SPC may (i) with 


                                       31
<PAGE>   36
notice to, but without the prior written consent of, the Company or any Agent
and without paying any processing fee therefor, assign all or a portion of its
interests in any Loans to its Granting Lender or to any financial institutions
providing liquidity and/or credit facilities to or for the account of such SPC
to fund the Loans made by such SPC or to support the securities (if any) issued
by such SPC to fund such Loans and (ii) disclose on a confidential basis any
non-public information relating to its Loans to any rating agency, commercial
paper dealer or provider of a surety, guarantee or credit or liquidity
enhancement to such SPC. In no event shall the Company be obligated to pay to an
SPC that has made a Loan any greater amount than the Company would have been
obligated to pay under this Agreement if the Granting Lender had made such Loan.
Each Granting Lender shall indemnify and hold harmless the Company and its
directors, officers, employees and agents from and against any and all losses,
liabilities, claims, damages and expenses arising from or attributable to the
making of a Loan by an SPC of such Granting Lender.

                  (c) In addition to the provisions of Section 8.09(b), PNC
Bank, National Association, as Granting Lender, may designate Wood Street
Funding Corporation as an SPC pursuant to a designating agreement entered into
by such Granting Lender and such SPC and accepted by Chase in substantially the
form of Exhibit F hereto (the "Designation Agreement"). Upon receipt of an
appropriately completed Designation Agreement executed by such Granting Lender
and such SPC, Chase will accept such Designation Agreement and give prompt
notice thereof to the Company, whereupon, from and after the effective date
specified in the Designation Agreement, such SPC shall become a party to this
Agreement with a right to make Money Market Loans on behalf of such Granting
Lender after the Company has accepted a Money Market Quote (or a portion
thereof) of such Granting Lender. Promptly after receipt of such notice, the
Company shall execute and deliver to such Granting Lender a Money Market Note in
the name of such SPC. Such Granting Lender shall serve as the agent (in its
capacity as a Granting Lender and not in its capacity as a referral lender) of
such SPC and shall on behalf of such SPC give and receive all communications and
notices and take all actions hereunder, including without limitation votes,
approvals, waivers, consents and amendments under or relating to this Agreement.
Any such notice, communication, vote approval, waiver, consent or amendment
shall be signed by such Granting Lender as agent (in its capacity as a Granting
Lender and not as a Bank) for such SPC and shall not be signed by such SPC. The
Company, the Agents and the Banks may rely thereon without any requirement that
such SPC sign or acknowledge the same.

                  Section 8.10 Counterparts. This Agreement may be executed in
any number of counterparts, all of which taken together shall constitute one
instrument and any of the parties hereto may execute this Agreement by signing
any such counterpart.

                  IX. THE AGENTS

                  Section 9.01 Appointment, Power and Immunities. Each Bank
hereby irrevocably appoints and authorizes each Designated Agent to act as its
agent hereunder with such powers as are specifically delegated to such Agent by
the terms of this Agreement, together with such other powers as are reasonably
incidental thereto. No Agent shall have any duties or responsibilities except
those expressly set forth in this Agreement, nor shall any Agent, by reason of
this 


                                       32
<PAGE>   37
Agreement, have a fiduciary relationship with any Bank. No Agent shall be
responsible to the Banks for any recitals, statements, representations or
warranties contained in this Agreement or in any information memorandum
pertaining to the Company or in any certificate or other document referred to or
provided for in, or received by any of them under, this Agreement, for the
value, validity, effectiveness, genuineness, enforceability or sufficiency of
this Agreement or the Notes or any other document referred to or provided for
herein or for any failure by the Company to perform its obligations under any
thereof. Each Designated Agent may employ agents and attorneys-in-fact and shall
not be answerable, except as to money or securities received by it or its
authorized agents, for the negligence or misconduct of any such agents or
attorneys-in-fact selected by it with reasonable care. Neither the Agents nor
any of their directors, officers, employees or agents shall be liable or
responsible for any action taken or omitted to be taken by them hereunder or in
connection herewith, except for their own gross negligence or willful
misconduct.

                  Section 9.02 Reliance by Agents. Each Agent shall be entitled
to rely upon any certificate, notice or other document (including any cable,
telegram, telecopy or telex) believed by it to be genuine and correct and to
have been signed or sent by or on behalf of the proper person or persons, and
upon advice and statements of legal counsel, independent accountants and other
experts selected by Chase. Chase may deem and treat the payee of any Note as the
owner thereof for all purposes hereof unless and until a notice of the
assignment thereof satisfactory to Chase signed by such payee shall have been
filed with it. As to any matters not expressly provided for by this Agreement,
each Agent shall in all cases be fully protected in acting, or in refraining
from acting, hereunder in accordance with written instructions signed by the
Majority Banks, and such instructions of the Majority Banks and any action taken
or failure to act pursuant thereto shall be binding on all of the Banks.

                  Section 9.03 Default. No Agent shall be deemed to have
knowledge of the occurrence of a Default or an Event of Default (other than
nonpayment of principal, interest or commitment or other fees) unless such Agent
has received written notice from a Bank or the Company specifying such Default
or Event of Default and stating that such notice is a "Notice of Default". In
the event that any Designated Agent receives such a notice of the occurrence of
a Default or an Event of Default, such Agent shall give prompt written notice
thereof to the other Agents and the Banks. The Designated Agents shall take such
action with respect to such Default or Event of Default as shall be reasonably
directed in writing by the Majority Banks provided that (i) unless and until the
Designated Agents shall have received such directions, the Designated Agents may
take such action, or refrain from taking such action, with respect to such
Default or Event of Default as they shall deem advisable in the best interests
of the Banks and (ii) in no event shall any Agent be required to institute any
action, suit or other proceeding in connection herewith.

                  Section 9.04 Rights as a Lender. With respect to its
Commitment and the Loans made by it or any collateral therefor, each of Chase,
Morgan and SunTrust (and any successor Agent hereunder) in its capacity as a
Bank under this Agreement shall have the same rights and powers hereunder as any
other Bank and may exercise the same as though it were not acting as an Agent,
and the term "Bank" or "Banks" shall, unless the context otherwise indicates,
include each of Chase, Morgan and SunTrust (and any successor Agent hereunder)
in its individual capacity. 


                                       33
<PAGE>   38
Each of Chase, Morgan and SunTrust (and any successor Agent hereunder) and their
affiliates may (without having to account therefor to any Bank) accept deposits
from, lend money to and generally engage in any kind of banking, trust or other
business with the Company (and any of its related companies) as if it were not
acting as an Agent and may accept fees and other consideration from the Company
for services in connection with this Agreement and otherwise without having to
account for the same to the other Agent and the Banks.

                  Section 9.05 Indemnification. The Banks severally agree to
indemnify each Agent (to the extent requested by such Agent as provided in
Section 9.08 hereof and/or to the extent not reimbursed by the Company), pro
rata according to the amounts of their respective Commitments, for any and all
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements of any kind and nature whatsoever which may be
imposed on, incurred by or asserted against such Agent in any way relating to or
arising out of this Agreement or any other documents referred to herein or the
transactions contemplated hereby (including, without limitation, the costs and
expenses which the Company is obligated to pay under Section 8.06 hereof but
excluding, unless a Default has occurred and is continuing, normal
administrative costs and expenses incident to the performance of its agency
duties hereunder) or the enforcement of any of the terms hereof or of any such
other documents, provided that (a) such Agent shall have given the Banks notice
thereof and an opportunity to defend against the same at the expense of the
Banks and with counsel selected by the Majority Banks, (b) no Bank shall be
liable to an Agent for any of the foregoing to the extent they arise from such
Agent's gross negligence or willful misconduct and (c) no Bank shall be liable
for any amount in respect of any compromise or settlement of any of the
foregoing unless such compromise or settlement is approved by the Majority
Banks.

                  Section 9.06 Reports. Promptly after its receipt thereof, each
Agent (or, if all Agents shall have received the same, Chase) will forward to
each Bank a copy of each report, notice or other document required by this
Agreement to be delivered to such Agent for such Bank.

                  Section 9.07 Non-Reliance on Agents and Other Banks. Each Bank
agrees that it has, independently and without reliance on any Agent or any other
Bank, and based on such documents and information as it has deemed appropriate,
made its own credit analysis of the Company and decision to enter into this
Agreement and that it will, independently and without reliance upon any Agent or
any other Bank, and based on such documents and information as it shall deem
appropriate at the time, continue to make its own analysis and decisions in
taking or not taking such action under this Agreement. No Agent shall be
required to keep itself informed as to the performance or observance by the
Company of this Agreement or any other document referred to or provided for
herein or to make inquiry of or to inspect the properties or books of the
Company. Except for notices, reports and other documents and information
expressly required to be furnished to the Banks by any Agent hereunder, no Agent
shall have any duty or responsibility to provide any Bank with any credit or
other information concerning the affairs, financial condition or business of the
Company (or any of its related companies) which may come into the possession of
such Agent or any of its affiliates.


                                       34
<PAGE>   39
                  Section 9.08 Failure to Act. Except for action expressly
required of any Agent under this Agreement, such Agent shall in all cases be
fully justified in failing or refusing to act unless it shall be indemnified to
its satisfaction by the Banks against any and all liability and expense which
may be incurred by it by reason of taking or continuing to take any such action.

                  Section 9.09 Resignation or Removal of Agents. Subject to the
appointment and acceptance of a successor Agent as provided below, any Agent may
resign at any time by giving written notice thereof to the Banks and the Company
and any Agent may be removed at any time with or without cause by the Majority
Banks. Upon any such resignation or removal, the Majority Banks shall have the
right to appoint a successor Agent. If no successor Agent shall have been so
appointed by the Majority Banks and shall have accepted such appointment within
30 days after the retiring Agent's giving of notice of resignation or the
Majority Banks' removal of the retiring Agent, then the retiring Agent may, on
behalf of the Banks, appoint a successor Agent, which shall be a bank which has
an office (or an affiliate or a Subsidiary with an office) in New York, New
York. Upon the acceptance of any appointment as Agent hereunder by a successor
Agent, such successor Agent shall thereupon succeed to and become vested with
all the rights, powers, privileges and duties of the retiring Agent, and the
retiring Agent shall be discharged from its duties and obligations hereunder.
After any retiring Agent's resignation or removal hereunder as Agent, the
provisions of this Agreement shall continue in effect for its benefit in respect
of any actions taken or omitted to be taken by it while it was acting as the
Agent.

                  Section 9.10 Documentation Agent. Nothing in this Agreement
shall impose on SunTrust, in its capacity as Documentation Agent, any duties or
obligations whatsoever.






                                       35
<PAGE>   40
                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed as of the date first above written.

                                        SONAT INC.


                                        By
                                             -----------------------------------
                                             Title:


                                        THE CHASE MANHATTAN BANK


                                        By
                                             -----------------------------------
                                             Title:


                                        MORGAN GUARANTY TRUST 
                                               COMPANY OF NEW YORK


                                        By
                                             -----------------------------------
                                             Title:


                                        TORONTO DOMINION (TEXAS), INC.


                                        By
                                             -----------------------------------
                                             Title:


                                        THE BANK OF NOVA SCOTIA


                                        By
                                             -----------------------------------
                                             Title:


                                        BANK OF AMERICA, N.T. & S.A.


                                        By
                                             -----------------------------------
                                             Title:


                                       36
<PAGE>   41
                                        SUNTRUST BANK, ATLANTA


                                        By
                                             -----------------------------------
                                             Title:


                                        By
                                             -----------------------------------
                                             Title:


                                        CREDIT LYONNAIS NEW YORK BRANCH


                                        By
                                             -----------------------------------
                                             Title:



                                        NATIONSBANK OF TEXAS, N.A.


                                        By
                                             -----------------------------------
                                             Title:


                                        MELLON BANK, N.A.


                                        By
                                             -----------------------------------
                                             Title:


                                        WACHOVIA BANK OF GEORGIA, N.A.


                                        By
                                             -----------------------------------
                                             Title:


                                        AMSOUTH BANK


                                        By
                                             -----------------------------------
                                             Title:


                                        BANK OF TOKYO - MITSUBISHI, LTD.


                                        By
                                             -----------------------------------
                                             Title:


                                       37
<PAGE>   42
                                        THE FIRST NATIONAL BANK OF CHICAGO


                                        By
                                             -----------------------------------
                                             Title:


                                        PNC BANK, NATIONAL ASSOCIATION


                                        By
                                             -----------------------------------
                                             Title:


                                        REGIONS BANK


                                        By
                                             -----------------------------------
                                             Title:


                                        KREDIETBANK


                                        By
                                             -----------------------------------
                                             Title:


                                        COMPASS BANK


                                        By
                                             -----------------------------------
                                             Title:


                                        FUJI BANK LTD.


                                        By
                                             -----------------------------------
                                             Title:


                                        ROYAL BANK OF CANADA


                                        By
                                             -----------------------------------
                                             Title:


                                        BANK OF NEW YORK


                                        By
                                             -----------------------------------
                                             Title:


                                       38
<PAGE>   43
                                        SOCIETE GENERALE


                                        By
                                             -----------------------------------
                                             Title:



                                        Agents
                                        

                                        THE CHASE MANHATTAN BANK,
                                               as Administrative Agent


                                        By
                                             -----------------------------------
                                             Title:


                                        MORGAN GUARANTY TRUST 
                                               COMPANY OF NEW YORK,
                                               as Syndication Agent


                                        By
                                             -----------------------------------
                                             Title:


                                        SUNTRUST BANK, ATLANTA,
                                               as Documentation Agent


                                        By
                                             -----------------------------------
                                             Title:




                                       39
<PAGE>   44
                                                                      SCHEDULE 1



                                   DEFINITIONS

                  As used in this Agreement, the following terms shall have the
following respective meanings:

                  "Additional Costs" shall have the meaning attributed thereto
in Section 3.01(a) hereof.

                  "Affected Loans" shall have the meaning attributed thereto in
Section 3.04 hereto.

                  "Affected Type" shall have the meaning attributed thereto in
Section 3.04 hereto.

                  "Agents" shall have the meaning attributed thereto in the
preamble to this Agreement.

                  "Annual Dates" shall mean the Quarterly Date in December of
each year.

                  "Applicable Facility Fee Rate" shall mean, with respect to any
day, the percentage indicated below opposite the Rating Level in effect on such
day:

<TABLE>
<CAPTION>
                  Rating Level                        Percentage
                  ------------                        ----------
                  <S>                                 <C>
                      I                                 0.080%
                      II                                0.100%
                      III                               0.125%
                      IV                                0.150%
                      V                                 0.200%
</TABLE>

                  "Applicable Lending Office" shall mean, with respect to each
Bank, with respect to each type of Loan, the Lending Office designated for such
type of Loan on Schedule 2 hereof, or on the signature pages of, or any schedule
to, any amendment hereto, or such other office or affiliate of such Bank as such
Bank may from time to time specify to Chase and the Company as the office at
which its Loans of such type are to be made and maintained.

                  "Applicable Margin" shall mean: (a) with respect to Domestic
Loans, zero; and (b) with respect to any Eurodollar Loan on any day, the
percentage indicated below opposite the Rating Level in effect on such day:

<TABLE>
<CAPTION>
                  Rating Level                        Percentage
                  ------------                        ----------
                  <S>                                 <C>
                      I                                 0.220%
                      II                                0.240%
                      III                               0.265%
                      IV                                0.315%
                      V                                 0.440%
</TABLE>

<PAGE>   45
                  "Appropriate Officer" shall mean the chief executive officer,
the chief operating officer, the chief financial officer, the Vice President -
Comptroller, the Vice President - Finance or the Treasurer.

                  "Banks" shall have the meaning attributed thereto in the
preamble to this Agreement, and which shall include the Swingline Bank in its
capacity as such.

                  "Base Rate" shall mean, for any day, the higher of (a) the
Federal Funds Rate for such day plus 1/2 of 1% per annum and (b) the Prime Rate
for such day. Each change in any interest rate provided for herein based upon
the Base Rate resulting from a change in the Base Rate shall take effect at the
time of such change in the Base Rate.

                  "Basle Accord" shall have the meaning attributed thereto in
Section 3.01(c) hereto.

                  "Business Day" shall mean any day on which commercial banks
are not authorized or required to close in New York City and, if such day
relates to a borrowing of, a payment or prepayment of principal of or interest
on, or the Interest Period for, a Eurodollar Loan or a notice by the Company
with respect to any such borrowing, payment, prepayment or Interest Period,
which is also a day on which dealings in Dollar deposits are carried out in the
London interbank market.

                  "Change in Control" shall have the meaning attributed thereto
in Section 1.04(b) hereto.

                  "Chase" shall mean The Chase Manhattan Bank in its capacity as
the Administrative Agent.

                  "Commitment" shall mean, as to each Bank, the obligation of
such Bank to make Syndicated Loans pursuant to Section 1.01 hereof in an
aggregate amount at any one time outstanding up to but not exceeding the amount
set opposite such Bank's name on Schedule 3 to this Agreement under the caption
"Commitment" (as the same may be reduced at any time or from time to time
pursuant to Section 1.04 hereof).

                  "Commitment Termination Date" shall mean the 363rd day after
the Effective Date.

                  "Company" shall have the meaning attributed thereto in the
preamble to this Agreement.

                  "Consolidated Capitalization" shall mean, for any Person, the
sum of Total Indebtedness and Equity of such Person and its Consolidated
Subsidiaries.

                  "Consolidated Subsidiary" shall mean any Subsidiary of a
Person which was or shall be consolidated with such Person in any consolidated
financial statement furnished to the Banks under this Agreement.

                  "Default" shall mean an Event of Default or an event which,
with the notice or lapse of time or both specified in Article VII hereof, would
become such an Event of Default.


                                       2
<PAGE>   46
                  "Derivative Obligations" shall mean any transaction which is a
rate swap transaction, basis swap, forward rate transaction, commodity swap,
commodity option, equity or equity index swap, equity or equity index option,
bond option, interest rate option, foreign exchange transaction, cap
transaction, floor transaction, collar transaction, currency swap transaction,
cross-currency rate swap transaction, currency option or any other similar
transaction (including any option with respect to any of these transactions).

                  "Designated Agents" shall mean Chase and Morgan.

                  "Dollars" and "$" shall mean lawful money of the United States
of America.

                  "Domestic Loans" shall mean Syndicated Loans which bear
interest at rates based upon the Base Rate.

                  "Effective Date" shall have the meaning attributed thereto in
Section 4.01 hereof.

                  "Equity" means at any time the sum of the following, for any
Person and its Consolidated Subsidiaries:

                           (i)      the amount of share capital liability,
         including common and preferred shares (less cost of treasury shares),
         plus

                           (ii)     the amount of surplus and retained earnings
         (or, in the case of a surplus or retained earnings deficit minus the
         amount of such deficit).

                  "ERISA" shall mean the Employee Retirement Income Security Act
of 1974, as amended from time to time, including (unless the context otherwise
requires) any rules or regulations promulgated thereunder.

                  "Eurodollar Loans" shall mean Syndicated Loans, the interest
rates on which are determined on the basis of rates referred to in the
definition of "Fixed Base Rate".

                  "Event of Default" shall mean any of the Events of Default
specified in Article VII hereof.

                  "Federal Funds Rate" shall mean, for any day, the rate per
annum (rounded upwards, if necessary, to the nearest 1/100 of 1%) equal to the
weighted average of the rates on overnight Federal funds transactions with
members of the Federal Reserve System arranged by Federal funds brokers on such
day, as published by the Federal Reserve Bank of New York on the Business Day
next succeeding such day, provided that (i) if the day for which such rate is to
be determined is not a Business Day, the Federal Funds Rate for such day shall
be such rate on such transactions on the next preceding Business Day as so
published on the next succeeding Business Day, and (ii) if such rate is not so
published for any day, the Federal Funds Rate for such day shall be the average
rate charged to The Chase Manhattan Bank on such day on such transactions as
determined by Chase.


                                       3
<PAGE>   47
                  "Fixed Base Rate" shall mean, with respect to any Fixed Rate
Loan, the arithmetic mean (rounded upwards, if necessary, to the nearest 1/100
of 1%), as determined by Chase, of the rate per annum quoted by each Reference
Bank at approximately 11:00 a.m. London time (or as soon thereafter as
practicable) on the date two Business Days prior to the first day of the
Interest Period for such Loan for the offering by such Reference Bank to leading
banks in the London interbank market of Dollar deposits having a term comparable
to such Interest Period and in an amount comparable to the principal amount of
the Eurodollar Loan to be made by such Reference Bank for such Interest Period.
If any Reference Bank is not participating in any Fixed Rate Loan, the Fixed
Base Rate for such Loan shall be determined by reference to the amount of the
Loan which such Reference Bank would have made had it been participating in such
Loan. If any Reference Bank does not timely furnish such information for
determination of any Fixed Base Rate, Chase shall determine such Fixed Base Rate
on the basis of information timely furnished by the remaining Reference Banks.

                  "Fixed Rate" shall mean, for any Fixed Rate Loan, a rate per
annum (rounded upwards, if necessary, to the nearest 1/100 of 1%) determined by
Chase to be equal to the Fixed Base Rate for such Loan for the Interest Period
for such Loan.

                  "Fixed Rate Loans" shall mean Eurodollar Loans.

                  "Indebtedness" shall mean, for any Person, all obligations for
borrowed money or purchase money obligations of such Person which in accordance
with generally accepted accounting principles would be shown on the balance
sheet of such Person as a liability; all obligations under leases required to be
capitalized under generally accepted accounting principles at the time of
entering into such lease; all guarantees of such Person in respect of
Indebtedness of others; Indebtedness of others secured by any mortgage, pledge,
security interest, encumbrance, lien or charge upon property owned by such
Person, whether or not assumed; Operating Lease Obligations; and, only as to any
Consolidated Subsidiary of the Company, any Mandatory Preferred Stock of such
Consolidated Subsidiary; provided that Indebtedness shall not include: (i) any
Indebtedness evidence of which is held in treasury (but the subsequent resale of
such Indebtedness shall be deemed to constitute the creation thereof); or (ii)
any particular Indebtedness if, upon or prior to the maturity thereof, there
shall have been deposited with the proper depositary, in trust, money or United
States government securities (or evidences of such Indebtedness as permitted by
the instrument creating such Indebtedness) in the necessary amount to pay,
redeem or satisfy such Indebtedness; or (iii) only as to the Company, any
Indebtedness of the Company to any of its Subsidiaries provided that such
Indebtedness is subordinated in right of payment to the prior payment in full of
the obligations of the Company to the Banks and the Agents under this Agreement
and the termination in full of the Commitments hereunder (including interest
accruing on such obligations after the date of any filing by the Company of any
petition in bankruptcy or the commencement of any bankruptcy, insolvency or
similar proceeding with respect to the Company) in the event that any Default
under this Agreement shall have occurred and be continuing and in the event of
any insolvency, bankruptcy or similar proceeding affecting the Company; or (iv)
any indirect guarantees or other contingent obligations in respect of
Indebtedness of other Persons, including agreements, contingent or otherwise,
with such other persons or with third persons with respect to, or to permit or
assure the payment of, 


                                       4
<PAGE>   48
obligations of such other persons, including, without limitation, agreements to
purchase or repurchase obligations of such other persons, to advance or supply
funds to, or to invest in, such other persons or to pay for properties, products
or services of such other persons (whether or not conveyed, delivered or
rendered); demand charge contracts, through-put, take-or-pay, keep-well,
make-whole or maintenance of working capital or similar agreements; or
guarantees with respect to rental or other similar periodic payments to be made
by such other Persons, including, but without limiting the generality of the
foregoing, the Guaranty Agreement dated as of June 1, 1968, as amended as of
August 1, 1968, May 1, 1970, April 13, 1973, May 26, 1973 and November 30, 1984,
between Boise Cascade Corporation, the Company and Parish of Beauregard,
Louisiana; or (v) any capitalized leases for space and/or equipment in respect
of oil and gas production platforms not in excess of $25,000,000 in the
aggregate; or (vi) any Indebtedness of Bear Creek Storage Company or Citrus
Corp. that is shown on the balance sheet of the Company as a liability and which
would not be required to be treated as Indebtedness of the Company or any of its
Subsidiaries under generally accepted accounting principles as in effect on the
date hereof but which is required to be treated as Indebtedness of the Company
or any of its Subsidiaries as a result of a change in generally accepted
accounting principles after the date hereof. For purposes of this Agreement, the
principal amount of any Indebtedness of any Person (excluding Operating Lease
Obligations and Mandatory Preferred Stock of a Consolidated Subsidiary) shall
mean the amount required in accordance with generally accepted accounting
principles to be shown as a liability on the balance sheet of such Person (or,
in the case of Indebtedness of another Person required to be treated as
Indebtedness of such Person under this Agreement, the balance sheet of such
other Person) prepared as of the applicable date.

                  "Interest Payment Date" shall mean, as to any Loan, the last
day of the Interest Period for such Loan and (i) with respect to a Set Rate Loan
with an Interest Period longer than 90 days, the last day of each consecutive 90
day period (other than such last day if such last day occurs within two Business
Days of the last day of such Interest Period) occurring during such Interest
Period commencing with the first day of such Interest Period, (ii) with respect
to a Eurodollar Loan with an Interest Period longer than three months, the last
day of each consecutive three month period (other than such last day if such
last day occurs within two Business Days of the last day of such Interest
Period) occurring during such Interest Period commencing with the first day of
such Interest Period and (iii) with respect to a Domestic Loan, each Quarterly
Date that occurs prior to the end of the Interest Period for such Loan.

                  "Interest Period" shall mean, for any Loan, the period
provided for such Loan pursuant to Section 2.03 hereof.

                  "Loans" shall mean Money Market Loans, Syndicated Loans and
Swingline Loans.

                  "Majority Banks" shall mean Banks having at least 66-2/3% of
the aggregate amount of the Commitments; provided that, if the Commitments shall
have terminated, Majority Banks shall mean Banks and SPCs holding at least
66-2/3% of the aggregate unpaid principal amount of the Loans.


                                       5
<PAGE>   49
                  "Mandatory Preferred Stock" shall mean, for any Person, the
aggregate stated liquidation value of any outstanding preferred stock issued by
such Person which is required to be redeemed, in whole or in part, by sinking
fund or other mandatory payments at any time prior to the Commitment Termination
Date.

                  "Moody's" shall mean Moody's Investor Service, Inc.

                  "Money Market Borrowing" shall have the meaning assigned to
such term in Section 1.02(b) hereof.

                  "Money Market Loans" shall mean the loans provided for by
Section 1.02 hereof.

                  "Money Market Note" shall have the meaning assigned to such
term in Section 1.10(b) hereof.

                  "Money Market Quote" shall mean an offer in accordance with
Section 1.02(c) hereof by a Bank to make a Money Market Loan with one single
specified interest rate.

                  "Money Market Quote Request" shall have the meaning assigned
to such term in Section 1.02(b) hereof.

                  "Money Market Rate" shall have the meaning assigned to such
term in Section 1.02(c)(ii)(C) hereof.

                  "Morgan" shall mean Morgan Guaranty Trust Company of New York
in its capacity as the Syndication Agent.

                  "Note" shall mean a Syndicated Note, a Money Market Note or a
Swingline Note.

                  "Operating Lease Obligations" shall mean, for the Company at
any date, if the minimum annual rental commitments of the Company and its
Consolidated Subsidiaries as lessee under leases (other than capital leases and
mineral leases) in effect on such date for the fiscal year in which such date
occurs shall exceed $30,000,000, the minimum rental commitments of the Company
and its Consolidated Subsidiaries as lessee over the remaining terms of such
leases that cause such minimum annual rental commitments to exceed $30,000,000,
discounted to present value at the rate of 10% per annum. For purposes of this
definition, rental payments under leases having the longest terms and which
cannot be canceled by the Lessee without the incurrence of a substantial penalty
shall be deemed to be those leases that cause such aggregate minimum rental
commitments to exceed $30,000,000.

                  "PBGC" shall mean the Pension Benefit Guaranty Corporation and
any entity succeeding to any or all of its functions under ERISA.

                  "Person" shall mean an individual, a corporation, a company, a
voluntary association, a partnership, a trust, an unincorporated organization or
a government or any agency, instrumentality or political subdivision thereof.


                                       6
<PAGE>   50
                  "Plan" shall mean any employee benefit or other plan
maintained by the Company or any Subsidiary of the Company for its employees and
covered by Title IV of ERISA.

                  "Post-Default Rate" shall mean, in respect of any amount
payable under this Agreement which is not paid when due (whether at stated
maturity, by acceleration or otherwise), a rate per annum for each day during
the period from the due date of such amount until such amount shall be paid in
full equal to 2% above the Base Rate in effect on such day (provided that, if
the amount so in default is principal of a Fixed Rate Loan or a Money Market
Loan and the due date thereof is a day other than the last day of the Interest
Period therefor, the "Post-Default Rate" for such principal shall be, for the
period from and including such due date to but excluding the last day of the
Interest Period for such Loan, 2% above the interest rate for such Loan as
provided in Section 2.02 hereof and, thereafter, the rate provided for above in
this definition).

                  "Prime Rate" shall mean the rate of interest from time to time
announced by Chase at its Principal Office as its prime commercial lending rate.

                  "Principal Office" shall mean (i) with respect to Chase or The
Chase Manhattan Bank, its principal office in New York, New York, presently
located at 1 Chase Manhattan Plaza, New York, N.Y. and (ii) with respect to
Morgan, its principal office in New York, New York, presently located at 60 Wall
Street, New York, N.Y.

                  "Quarterly Dates" shall mean the last day of each March, June,
September and December, commencing on the first such date after the Effective
Date.

                  "Quarterly Period" shall mean the period of three consecutive
calendar months ending on each Quarterly Date.

                  "Quotation Date" shall have the meaning attributed thereto in
Section 1.02(b)(iv) hereof.

                  "Rating Level" shall mean, as of any day, the level indicated
below opposite the statement that is correct with respect to the ratings of the
Company's senior unsecured long-term debt securities as of such day, provided,
that if the ratings of S&P and Moody's on such day fall within different levels,
the level shall be the level which is one level above the level with the lower
rating unless there is a difference of more than two levels, in which case the
level shall be the level which is one level below the level with the higher
rating:

<TABLE>
<CAPTION>
                  Rating                                                Level
                  ------                                                -----
                  <S>                                                   <C>
                  A- or better by S&P or A3 or better by Moody's          I

                  BBB+ by S&P or Baa1 by Moody's                          II

                  BBB by S&P or Baa2 by Moody's                           III

                  BBB- by S&P or Baa3 by Moody's                          IV
</TABLE>


                                       7
<PAGE>   51
<TABLE>
<CAPTION>
                  Rating                                                Level
                  ------                                                -----
                  <S>                                                   <C>
                  Below BBB- by S&P and below Baa3 by Moody's             V
</TABLE>

For purposes of this definition, "I" shall be the highest level and "V" shall be
the lowest level. If any rating established or deemed to have been established
by Moody's or S&P shall be changed, such change shall be effective as of the
date on which it is first announced by the applicable rating agency. Each change
in the Rating Level shall apply during the period commencing on the effective
date of such change and ending on the date immediately preceding the effective
date of the next such change. If the rating system of Moody's or S&P shall
change so as to make the above ratings inapplicable, or if either such rating
agency shall cease to be in the business of rating corporate debt obligations or
shall no longer have in effect a rating for any reason, the Company and the
Banks shall negotiate in good faith to amend the references to specific ratings
in this definition to reflect such changed rating system or the non-availability
of ratings from such rating agency or to select a substitute rating agency and
pending or in the absence of any agreement the Rating Level will be determined
by reference to the single available rating, if any, or, in the absence of any
rating, then such rating agencies will be deemed to have established a rating in
Level V.

                  "Reference Banks" shall mean The Chase Manhattan Bank and
Morgan Guaranty Trust Company of New York (or their Applicable Lending Offices,
as the case may be).

                  "Regulation D" shall mean Regulation D of the Board of
Governors of the Federal Reserve System (or any successor), as the same may be
amended or supplemented from time to time.

                  "Regulatory Change" shall mean, with respect to any Bank, any
change after the date of this Agreement in United States Federal, state or
foreign law or regulations (including, without limitation, Regulation D) or the
adoption or making after such date of any interpretation, directive or request
applying to a class of banks including such Bank of or under any United States
Federal, state or foreign law or regulations (whether or not having the force of
law) by any court or governmental or monetary authority charged with the
interpretation or administration thereof.

                  "Restricted Subsidiaries" shall mean SNG, Sonat Exploration,
and any other Subsidiary of the Company which shall acquire or succeed to all or
any substantial part of the assets or the stock of any such Restricted
Subsidiary (in which case any references to any such Restricted Subsidiary in
this Agreement shall, mutatis mutandis, be deemed to refer to such other
Subsidiary).

                  "Set Rate Auction" shall mean a solicitation of Money Market
Quotes setting forth Money Market Rates pursuant to Section 1.02 hereof.


                                       8
<PAGE>   52
                  "Set Rate Loans" shall mean Money Market Loans the interest
rates on which are determined on the basis of Money Market Rates pursuant to a
Set Rate Auction.

                  "SNG" shall mean Southern Natural Gas Company, a wholly-owned
Subsidiary of the Company (except for directors' qualifying shares).

                  "Sonat Exploration" shall mean Sonat Exploration Company, a
wholly-owned Subsidiary of the Company (except for directors' qualifying
shares).

                  "S&P" shall mean Standard & Poor's Corporation.

                  "SPC" shall have the meaning provided in Section 8.09(b).

                  "Subsidiary" shall mean, as to any Person, any corporation,
partnership or other entity at least a majority of whose securities or other
ownership interests having ordinary voting power for the election of directors
or other persons performing similar functions of such corporation, partnership
or entity (other than securities or other ownership interests having such power
only by reason of the happening of a contingency) are at the same time owned by
such Person and/or one or more of its other Subsidiaries.

                  "SunTrust" shall mean SunTrust Bank, Atlanta, in its capacity
as the Documentation Agent.

                  "Swingline Account" shall mean the account of the Company
maintained with the Swingline Bank at its Lending Office which the Company and
the Swingline Lender shall designate as the Swingline Account for purposes of
this Agreement.

                  "Swingline Bank" shall mean SunTrust Bank, Atlanta, in its
capacity as the lender of Swingline Loans.

                  "Swingline Business Day" shall mean any day on which
commercial banks are not authorized or required to close in Atlanta, Georgia.

                  "Swingline Commitment" shall mean the obligation of the
Swingline Bank to make Swingline Loans pursuant to Section 1.03 hereof in an
aggregate principal amount at any one time outstanding up to but not exceeding
$60,000,000.

                  "Swingline Loans" shall have the meaning assigned to such term
in Section 1.03 hereof.

                  "Swingline Note" shall have the meaning assigned to such term
in Section 1.10(c) hereof.

                  "Syndicated Loans" shall mean the loans provided for by
Section 1.01 hereof.

                  "Syndicated Note" shall have the meaning assigned to such term
in Section 1.10(a) hereof.


                                       9
<PAGE>   53
                  "Termination Event" shall mean any event or condition which
would constitute grounds under Section 4042 of ERISA for the termination of, or
for the appointment of a trustee to administer, any Plan.

                  "Total Indebtedness" shall mean, for any Person, the aggregate
unpaid principal amount of the Indebtedness of such Person and its Consolidated
Subsidiaries (excluding Indebtedness of any Consolidated Subsidiary to such
Person or another such Consolidated Subsidiary and, except for the Company,
Indebtedness of such Person to any of its Consolidated Subsidiaries).










                                       10
<PAGE>   54
                                                                      SCHEDULE 2

                                 LENDING OFFICES
                                     AND/OR


                              ADDRESSES FOR NOTICES

1.       SONAT INC.

         Address for Notices:
         -------------------
              AmSouth-Sonat Tower
              1900 Fifth Avenue North
              Birmingham, Alabama 35202-2563
              Attention: Treasurer

              Fax: 205-325-7490
              Telex: 4955644
              Answerback: SNGC UI

                  2.       The Chase Manhattan Bank (as a Bank and as 
                           Administrative Agent)

         Lending Office for All Types of Loans:
         --------------------------------------
              The Chase Manhattan Bank
              1 Chase Manhattan Plaza
              New York, New York 10081

         Address for Notices:
         --------------------
              The Chase Manhattan Bank
              1 Chase Manhattan Plaza
              New York, New York 10081
              Attention: Loan and Agency Services
                         Lisa Pucciarelli

              Telephone: 212-552-7886
              Fax: 212-552-5777


         With copies to:
         ---------------
              The Chase Manhattan Bank
              270 Park Avenue
              New York, New York 10017
              Attention: Oil & Gas Group
                         Mary Jo Woodford
                         Renee Goldstein

              Chase Securities, Inc.
              270 Park Avenue
<PAGE>   55
              New York, New York 10017-2070
              Attention: Financial Products Money Market Management
                         6th floor

              Chase Securities, Inc.
              1100 Milan, Suite 2345
              Houston, Texas 77002

                  3.       Morgan Guaranty Trust Company
           OF NEW YORK (AS A BANK AND AS SYNDICATION AGENT)

         Lending Office for Domestic Loans:
         ----------------------------------
              Morgan Guaranty Trust Company of New York
              60 Wall Street
              New York, New York 10260

         Lending Office for Eurodollar Loans:
         ------------------------------------
              Morgan Guaranty Trust Company of New York
              Nassau Bahamas Office
              c/o J.P. Morgan Services Inc.
              Euro-Loan Servicing Unit - Loan Operations
              500 Stanton-Christiana Road - 3rd Fl.
              Newark, Delaware 19713

         Address for Notices:
         --------------------
              Morgan Guaranty Trust Company of New York
              c/o J.P. Morgan Services Inc.
              500 Stanton-Christiana Road
              Newark, Delaware 19713
              Attention: Deborah Jones
                         Loan Department-Unit 22

              Telephone: 302-634-1940
              Fax: 302-634-1872
              Telex: 177615
              Answerback: MGT UT

                  4.       The Toronto-Dominion Bank

         Lending Office for All Types of Loans:
         --------------------------------------
              The Toronto-Dominion Bank
              909 Fannin Street
              17th Floor
              Houston, TX 77010


                                       2
<PAGE>   56
         Address for Notices:
         --------------------
              The Toronto-Dominion Bank
              909 Fannin Street
              17th Floor
              Houston, TX 77010

              Telephone: 713-653-8200
              Fax: 713-951-9921

                  5.       The Bank of Nova Scotia

         Lending Office for All Types of Loans:
         --------------------------------------
              The Bank of Nova Scotia
              600 Peachtree Street, N.E.
              Suite 2700
              Atlanta, Georgia 30308

         Address for Notices:
         --------------------
              The Bank of Nova Scotia
              600 Peachtree Street, N.E.
              Suite 2700
              Atlanta, Georgia 30308
              Attention: Eudia Smith

              Telephone: 404-877-1553
              Fax: 404-888-8998

                           6.       Bank of America, N.T. & S.A.

         Lending Office for All Types of Loans:
         --------------------------------------
              Bank of America (Houston)
              Three Allen Center, 333 Clay St.
              Houston, TX 77002

         Address for Notices:
         --------------------
              Bank of America (Houston)
              Three Allen Center, 333 Clay St.
              Houston, TX 77002
              Attention: Robert R. Ingersall

              Telephone: 713-651-4922
              Fax: 713-651-4808


                                       3
<PAGE>   57
        7.        SunTrust Bank, Atlanta (as a Bank,
                           as the Swingline Bank and as Documentation Agent)

         Lending Office for All Types of Loans:
         --------------------------------------
              SunTrust Bank, Atlanta
              25 Park Place
              Atlanta, Georgia 30303

         Address for Notices:
         --------------------
              SunTrust Bank, Atlanta
              P.O. Box 4418, Mail Code 120
              Atlanta, Georgia 30303
              Attention: Gina Muncus

              Telephone: 404-658-4624
              Fax: 404-827-6270
              Telex: 54220
              Answerback: TruscoIntAtl

                  8.       Credit Lyonnais New York Branch

         Lending Office for All Types of Loans
         -------------------------------------
              Credit Lyonnais New York Branch
              c/o Credit Lyonnais Houston Representative Office
              1000 Louisiana, Suite #5360
              Houston, Texas 77002

         Address for Notices:
         --------------------
              Credit Lyonnais New York Branch
              c/o Credit Lyonnais Houston Representative Office
              1000 Louisiana, Suite #5360
              Houston, Texas 77002
              Attention: Richard S. Kaufman
                         Vice President

              Telephone: (713) 751-0500
              Fax: (713) 751-0307
              Telex: 6868674
              Answerback: CL HOU UN

                  9.       NationsBank of Texas, N.A.

         Lending Office for All Types of Loans:
         --------------------------------------
              NationsBank of Texas, N.A.
              700 Louisiana
              Houston, TX 77002


                                       4
<PAGE>   58
         Address for Notices:
         --------------------
              NationsBank of Texas, N.A.
              700 Louisiana
              Houston, TX 77002
              Attention: Energy Group

              Telephone: 713-247-6078
              Fax: 713-247-6432
              Telex: 6829317
              Answerback: NationSBk DAL

                  10.      Mellon Bank, N.A.

         Lending Office for All Types of Loans:
         --------------------------------------
              Mellon Bank, N.A.
              The Mellon Bank Center
              Loan Administration
              Room 1203
              Pittsburgh, PA 15259
              Attention: Supervisor

              Telephone: 412-234-4087
              Fax: 412-236-2027

         Address for notices:
         --------------------
              Mellon Bank, N.A.
              One Mellon Bank Center
              Room 4425
              Pittsburgh, PA 15258
              Attention: A. Gary Chace
                         Manager, Energy Services Group

              Telephone: 412-236-2786
              Fax: 412-236-1840

         Address for Notices Regarding Money Market Loans
         ------------------------------------------------
              Mellon Bank, N.A.
              One Mellon Bank Center
              Capital Markets, Room 151-0400
              Pittsburgh, PA 15258-0001
              Attention: Marilyn Wagner

              Telephone: (412) 234-1693
              Fax: (412) 234-7834


                                       5
<PAGE>   59
                  11.      Wachovia Bank of Georgia, N.A.

         Lending Office for All Types of Loans:
         --------------------------------------
              Wachovia Bank of Georgia, N.A.
              191 Peachtree Street N.E.
              29th Floor
              Atlanta, Georgia 30303-1757

         Address for Notices:
         --------------------
              Wachovia Bank of Georgia, N.A.
              191 Peachtree Street N.E.
              29th Floor
              Atlanta, Georgia 30303-1757
              Attention: Lanny Nixon
                         Assistant Vice President

              Telephone: 404-332-4884
              Fax: 404-332-5016

                  12.      AmSouth Bank

         Lending Office for All Types of Loans:
         --------------------------------------
              AmSouth Bank
              1900 Fifth Avenue North
              Birmingham, Alabama 35203

         Address for Notices:
         --------------------
              AmSouth Bank
              1900 Fifth Avenue North
              Birmingham, Alabama 35203
              Attention: David A. Simmons
                         Senior Vice President

              Telephone: 205-326-5924
              Fax: 205-801-0157

                  13.      The Bank of Tokyo - Mitsubishi, Limited


         Lending Office for All Types of Loans:
         --------------------------------------
              The Bank of Tokyo - Mitsubishi, Limited
                  Atlanta Agency
              133 Peachtree Street, N.E.
              Georgia Pacific Center # 4970
              Atlanta, GA 30303-1808


                                       6
<PAGE>   60
         Address for Notices:
         --------------------
              The Bank of Tokyo - Mitsubishi, Limited
                  Atlanta Agency
              133 Peachtree Street, N.E.
              Georgia-Pacific Center, Suite 4970
              Atlanta, GA 30303-1808
              Attention: Bill Otott

              Telephone: 404-577-2960
              Fax: 404-577-1155

                  14.      PNC Bank, National Association

         Lending Office for All Types of Loans
         -------------------------------------
              PNC Bank, National Association
              Natural Resources Department
              One PNC Plaza, 3rd Floor
              249 Fifth Avenue
              Pittsburgh, PA 15222-2707

         Address for Notices:
         --------------------
              PNC Bank, National Association
              Natural Resources Department
              One PNC Plaza, 3rd Floor
              249 Fifth Avenue
              Pittsburgh, PA 15222-2707
              Attention: Drew Potts

              Telephone: 412-762-2572
              Fax: 412-762-2571

                  15.      Regions Bank

         Lending Office for All Types of Loans
         -------------------------------------
              Regions Bank (Birmingham)
              417 North 20th Street
              Birmingham AL 35202

         Address for Notices:
         --------------------
              Regions Bank (Birmingham
              417 North 20th Street
              Birmingham, AL 35202
              Attention: Chuck Allen

              Telephone: (205) 326-7003
              Fax: (205) 326-7739


                                       7
<PAGE>   61
                  16.      Kredietbank, N.V.

         Lending Office for All Types of Loans
         -------------------------------------
              Kredietbank (Atlanta)
              1349 West Peachtree Street, Suite 1750
              Atlanta, GA 30309

         Address for Notices:
         --------------------
              Kredietbank (Atlanta)
              1349 West Peachtree Street, Suite 1750
              Atlanta, GA 30309
              Attention: Michael Sawicki

              Telephone: (404) 876-2556
              Fax: (404) 876-3212

                  17.      Compass Bank

         Lending Office for All Types of Loans
         -------------------------------------
              Compass Bank
              15 20th Street South
              Birmingham, AL 25233

         Address for Notices:
         --------------------
              Compass Bank
              15 20th Street South
              Birmingham, AL 25233
              Attention: Todd Liscomb

              Telephone: (205) 933-3992
              Fax: (205) 933-3926

                  18.      Fuji Bank Ltd.

         Lending Office for All Types of Loans
         -------------------------------------
              Fuji Bank Ltd. (Atlanta)
              Suite 2100 of the Marquis One Tower
              245 Peachtree Center Avenue NE
              Atlanta, GA 30303
              Attention: Connie Fowls

              Telephone: (404) 215-3304

         Address for Notices:
         --------------------
              Fuji Bank Ltd. (Atlanta)
              Suite 2100 of the Marquis One Tower


                                       8
<PAGE>   62
              245 Peachtree Center Avenue NE
              Atlanta, GA 30303
              Attention: Clarence Mahovlich

              Telephone: (404) 215-3316
              Fax: (404) 653-2119

                  19.      Royal Bank of Canada

         Lending Office for All Types of Loans
         -------------------------------------
              Royal Bank of Canada, New York
              Financial Square, 23rd Floor
              New York NY 10005-3531
              Attention: Asst. Manager, Loan Processing

              Telephone: (212) 428-6321
              Fax: (212) 428-2372

         Address for Notices:
         --------------------
              Royal Bank of Canada
              c/o Royal Bank of Canada
              Financial Square, 23rd Floor
              New York NY 10005-3531

              Telephone:
              Fax: (212) 428-2372

         With Copies to:
         ---------------
              Royal Bank of Canada
              Attn: Gil Benard
              12450 Greenspoint Drive, Suite 1450
              Houston, TX 77060

              Telephone: (281) 874-5662
              Fax: (281) 874-0081

                  20.      Bank of New York

         Lending Office for All Types of Loans
         -------------------------------------
              Bank of New York
              One Wall Street
              New York, NY 10286

         Address for Notices:
         --------------------
              Bank of New York
              One Wall Street


                                       9
<PAGE>   63
              New York, NY 10286
              Attention: Steven Kalachman

              Telephone: (212) 635-7881
              Fax: (212) 635-7923

                  21.      Societe Generale

         Lending Office for All Types of Loans
         -------------------------------------
              Societe Generale, Southwest Agency
              1111 Bagby Street, Suite 2020
              Houston, TX  77002
              Attention: Richard A. Gould, Vice President

              Telephone: 713-759-6300
              Fax: 713-650-0824

         Address for Notices:
         --------------------
              Societe Generale
              2001 Ross Avenue, Suite 4800
              Dallas, TX 75201
              Attention: Lia Guerra

              Telephone: 214-979-2769
              Fax: 214-979-1104

         With copy to:
         -------------
              Societe Generale (Houston)
              1111 Bagby, Suite 2020
              Houston, TX 77002
              Attention: Richard A. Gould

              Telephone: (713) 759-6324
              Fax: (713) 650-0824




                                       10
<PAGE>   64
                                                                      SCHEDULE 3


<TABLE>
<CAPTION>
                 BANKS                                              COMMITMENT
<S>                                                                <C>
THE CHASE MANHATTAN BANK                                           $ 65,000,000

MORGAN GUARANTY TRUST COMPANY OF NEW YORK                            62,500,000

SUNTRUST BANK, ATLANTA                                               62,500,000

BANK OF AMERICA, N.T. & S.A.                                         40,000,000

CREDIT LYONNAIS NEW YORK BRANCH                                      40,000,000

NATIONSBANK OF TEXAS, N.A.                                           40,000,000

TORONTO DOMINION (TEXAS), INC.                                       40,000,000

THE BANK OF NOVA SCOTIA                                              30,000,000

BANK OF TOKYO - MITSUBISHI, LTD.                                     30,000,000

KREDIETBANK N.V.                                                     30,000,000

MELLON BANK, N.A.                                                    30,000,000

PNC BANK, NATIONAL ASSOCIATION                                       30,000,000

ROYAL BANK OF CANADA                                                 30,000,000

SOCIETE GENERALE                                                     30,000,000

AMSOUTH BANK                                                         25,000,000

BANK OF NEW YORK                                                     25,000,000

THE FUJI BANK LTD., ATLANTA AGENCY                                   25,000,000

REGIONS BANK                                                         25,000,000

WACHOVIA BANK OF GEORGIA, N.A.                                       25,000,000

COMPASS BANK                                                         15,000,000
                                                                   ------------
                                                                   $700,000,000
</TABLE>

<PAGE>   65
                                                                     EXHIBIT A-1



                       [Form of Note for Syndicated Loans]


                                 PROMISSORY NOTE
$______________                                               ____________, 19__
                                                              New York, New York

                  FOR VALUE RECEIVED, SONAT INC., a Delaware corporation (the
"Company"), hereby promises to pay to ______________ (the "Bank"), for account
of its respective Applicable Lending Offices provided for by the Credit
Agreement referred to below, at the principal office of The Chase Manhattan Bank
at 1 Chase Manhattan Plaza, New York, New York 10081, the principal sum of
_____________ Dollars (or such lesser amount as shall equal the aggregate unpaid
principal amount of the Syndicated Loans made by the Bank to the Company under
the Credit Agreement), in lawful money of the United States of America and in
immediately available funds, on the dates and in the principal amounts provided
in the Credit Agreement, and to pay interest on the unpaid principal amount of
each such Syndicated Loan, at such office, in like money and funds, for the
period commencing on the date of such Syndicated Loan until such Syndicated Loan
shall be paid in full, at the rates per annum and on the dates provided in the
Credit Agreement.

                  The date, amount, type, interest rate and maturity date of
each Syndicated Loan made by the Bank to the Company, and each payment made on
account of the principal thereof, shall be recorded by the Bank on its books
and, prior to any transfer of this Note, endorsed by the Bank on the schedule
attached hereto or any continuation thereof. The failure of the Bank to make any
notation or entry or any error in such a notation or entry shall not, however,
limit or otherwise affect any obligation of the Company under the Credit
Agreement or this Note.

                  This Note is one of the Notes referred to in the Credit
Agreement (as modified and supplemented and in effect from time to time, the
"Credit Agreement") dated as of January 26, 1998, among the Company, the banks
named therein and The Chase Manhattan Bank, as Administrative Agent, Morgan
Guaranty Trust Company of New York, as Syndication Agent, and SunTrust Bank,
Atlanta, as Documentation Agent, and evidences Syndicated Loans made by the Bank
thereunder. Capitalized terms used in this Note have the respective meanings
assigned to them in the Credit Agreement.

                  The Credit Agreement provides for the acceleration of the
maturity of this Note upon the occurrence of certain events and for prepayments
of Loans upon the terms and conditions specified therein.
<PAGE>   66
                  This Note shall be governed by, and construed in accordance
with, the law of the State of New York.

                                        SONAT INC.



                                        By
                                             -----------------------------------
                                             Title:








                                        2
<PAGE>   67
                                SCHEDULE OF LOANS

                  This Note evidences Loans made under the within-described
Credit Agreement to the Company, on the dates, in the principal amounts, of the
types, bearing interest at the rates and maturing on the dates set forth below,
subject to the payments and prepayments of principal set forth below:


<TABLE>
<CAPTION>
                 Principal
     Date          Amount         Type                        Maturity       Amount         Unpaid
      of             of            of          Interest       Date of        Paid or      Principal      Notation
     Loan           Loan          Loan           Rate           Loan         Prepaid        Amount        Made by
     ----        ---------        ----         --------       --------       -------      ---------      --------
     <S>         <C>              <C>          <C>            <C>            <C>          <C>            <C>

</TABLE>




<PAGE>   68
                                                                     EXHIBIT A-2





                      [Form of Note for Money Market Loans]


                                 PROMISSORY NOTE
                                                              _____________, 19_
                                                              New York, New York

                  FOR VALUE RECEIVED, SONAT INC., a Delaware corporation (the
"Company"), hereby promises to pay to __________________ (the "Bank"), for
account of its respective Applicable Lending Offices provided for by the Credit
Agreement referred to below, at the principal office of The Chase Manhattan Bank
at 1 Chase Manhattan Plaza, New York, New York 10081, the aggregate unpaid
principal amount of the Money Market Loans made by the Bank to the Company under
the Credit Agreement, in lawful money of the United States of America and in
immediately available funds, on the dates and in the principal amounts provided
in the Credit Agreement, and to pay interest on the unpaid principal amount of
each such Money Market Loan, at such office, in like money and funds, for the
period commencing on the date of such Money Market Loan until such Money Market
Loan shall be paid in full, at the rates per annum and on the dates provided in
the Credit Agreement.

                  The date, amount, interest rate and maturity date of each
Money Market Loan made by the Bank to the Company, and each payment made on
account of the principal thereof, shall be recorded by the Bank on its books
and, prior to any transfer of this Note, endorsed by the Bank on the schedule
attached hereto or any continuation thereof. The failure of the Bank to make any
notation or entry or any error in such a notation or entry shall not, however,
limit or otherwise affect any obligation of the Company under the Credit
Agreement or this Note.

                  This Note is one of the Notes referred to in the Credit
Agreement (as modified and supplemented and in effect from time to time, the
"Credit Agreement") dated as of January 26, 1998, among the Company, the banks
named therein and The Chase Manhattan Bank, as Administrative Agent, Morgan
Guaranty Trust Company of New York, as Syndication Agent, and SunTrust Bank,
Atlanta, as Documentation Agent, and evidences Money Market Loans made by the
Bank thereunder. Capitalized terms used in this Note have the respective
meanings assigned to them in the Credit Agreement.

                  The Credit Agreement provides for the acceleration of the
maturity of this Note upon the occurrence of certain events and for prepayments
of Loans upon the terms and conditions specified therein.
<PAGE>   69
                  This Note shall be governed by, and construed in accordance
with, the law of the State of New York.

                                        SONAT INC.



                                        By
                                             -----------------------------------
                                             Title:








                                       2
<PAGE>   70
                                SCHEDULE OF LOANS

                  This Note evidences Loans made under the within-described
Credit Agreement to the Company, on the dates, in the principal amounts, bearing
interest at the rates and maturing on the dates set forth below, subject to the
payments and prepayments of principal set forth below:


<TABLE>
<CAPTION>
                      Principal
      Date             Amount                            Maturity           Amount            Unpaid
       of                of             Interest          Date of          Paid or          Principal         Notation
      Loan              Loan              Rate             Loan            Prepaid            Amount           Made by
      ----            ---------         --------         --------          -------          ---------         --------
      <S>             <C>               <C>              <C>               <C>              <C>               <C>

</TABLE>

<PAGE>   71
                                                                     EXHIBIT A-3



                       [Form of Note for Swingline Loans]


                                 PROMISSORY NOTE
$__________________                                           ____________, 19__
                                                              New York, New York

                  FOR VALUE RECEIVED, SONAT INC., a Delaware corporation (the
"Company"), hereby promises to pay to SUNTRUST BANK, ATLANTA (the "Bank"), for
account of its respective Applicable Lending Offices provided for by the Credit
Agreement referred to below, at the principal office of The Chase Manhattan Bank
at 1 Chase Manhattan Plaza, New York, New York 10081, the principal sum of
____________ Dollars (or such lesser amount as shall equal the aggregate unpaid
principal amount of the Swingline Loans made by the Bank to the Company under
the Credit Agreement), in lawful money of the United States of America and in
immediately available funds, on the dates and in the principal amounts provided
in the Credit Agreement, and to pay interest on the unpaid principal amount of
each such Swingline Loan, at such office, in like money and funds, for the
period commencing on the date of such Swingline Loan until such Swingline Loan
shall be paid in full, at the rates per annum and on the dates provided in the
Credit Agreement.

                  The date, amount, type, interest rate and maturity date of
each Swingline Loan made by the Bank to the Company, and each payment made on
account of the principal thereof, shall be recorded by the Bank on its books
and, prior to any transfer of this Note, endorsed by the Bank on the schedule
attached hereto or any continuation thereof. The failure of the Bank to make any
notation or entry or any error in such a notation or entry shall not, however,
limit or otherwise affect any obligation of the Company under the Credit
Agreement or this Note.

                  This Note is one of the Notes referred to in the Credit
Agreement (as modified and supplemented and in effect from time to time, the
"Credit Agreement") dated as of January 26, 1998, among the Company, the banks
named therein and The Chase Manhattan Bank, as Administrative Agent, Morgan
Guaranty Trust Company of New York, as Syndication Agent, and SunTrust Bank,
Atlanta, as Documentation Agent, and evidences Swingline Loans made by the Bank
thereunder. Capitalized terms used in this Note have the respective meanings
assigned to them in the Credit Agreement.

                  The Credit Agreement provides for the acceleration of the
maturity of this Note upon the occurrence of certain events and for prepayments
of Loans upon the terms and conditions specified therein.
<PAGE>   72
                  This Note shall be governed by, and construed in accordance
with, the law of the State of New York.

                                        SONAT INC.



                                        By
                                             -----------------------------------
                                             Title:








                                       2
<PAGE>   73
                                SCHEDULE OF LOANS

                  This Note evidences Loans made under the within-described
Credit Agreement to the Company, on the dates, in the principal amounts, of the
types, bearing interest at the rates and maturing on the dates set forth below,
subject to the payments and prepayments of principal set forth below:


<TABLE>
<CAPTION>
                 Principal
     Date          Amount         Type                        Maturity       Amount        Unpaid
      of             of            of          Interest       Date of        Paid or      Principal      Notation
     Loan           Loan          Loan           Rate           Loan         Prepaid        Amount        Made by
     ----         --------        ----         --------       --------       -------      ---------      --------
     <S>         <C>              <C>          <C>            <C>            <C>          <C>            <C>

</TABLE>

<PAGE>   74
                                                                       EXHIBIT B



               [Form of Opinion of Special Counsel to the Company]

                                                                January __, 1998

To the Banks party to the Agreement 
         referred to below and The Chase 
         Manhattan Bank, as Administrative 
         Agent, Morgan Guaranty Trust Company
         of New York, as Syndication Agent and 
         SunTrust Bank, Atlanta, as Documentation 
         Agent

Dear Sirs:

                  We have acted as special counsel for Sonat Inc., a Delaware
corporation (the "Company"), in connection with the execution and delivery of
the Credit Agreement (the "Agreement") dated as of January 26, 1998, among the
Company, the Banks named therein and The Chase Manhattan Bank, as Administrative
Agent, Morgan Guaranty Trust Company of New York, as Syndication Agent and
SunTrust Bank, Atlanta, as Documentation Agent.

                  This opinion is delivered to you pursuant to Section 4.01(v)
of the Agreement. All capitalized terms not otherwise defined herein shall have
the meanings attributed to them in the Agreement.

                  In this connection, and as a basis for the opinions expressed
below, we have examined or relied upon originals or copies, certified or
otherwise identified to our satisfaction, of such records, instruments,
certificates and other documents, have made such inquiries as to questions of
fact of officers and representatives of the Company and have made such
examinations of law as we have deemed necessary or appropriate for purposes of
giving the opinions hereinafter expressed. As to certain matters in respect of
the opinions expressed in paragraphs 1 and 2 below, we have relied, with your
permission, solely on the opinion, a copy of which is attached hereto, of
William A. Smith, Executive Vice President and General Counsel.

                  In rendering the opinions expressed below, we have assumed
that the Agreement has been duly authorized, executed and delivered by each
party thereto other than the Company, that each party thereto other than the
Company has the requisite power and authority to execute, deliver and perform
the Agreement, and that such execution, delivery and performance by such other
parties does not and will not breach, conflict with or constitute a violation of
the laws or governmental rules or regulations of any jurisdiction.

                  Each of the opinions expressed below is restricted to matters
controlled or affected by Federal laws, the General Corporation Law of the State
of Delaware and the laws of the State of New York.
<PAGE>   75
                  On the basis of the foregoing, it is our opinion that:

                           1. The Company is a corporation duly incorporated,
                  validly existing and in good standing under the laws of the
                  State of Delaware and is duly licensed or qualified to do
                  business and is in good standing in the States of Alabama,
                  Texas and New York, constituting those states which we have
                  been advised are the states in which the Company believes the
                  conduct of its business or the ownership of its assets
                  requires such qualification, and the Company has the corporate
                  power to make the Agreement and the Notes and to borrow under
                  the Agreement.

                           2. The making and performance by the Company of the
                  Agreement and the Notes and borrowings under the Agreement
                  have been duly authorized by all necessary corporate action
                  and do not and will not contravene any provision of law
                  applicable to the Company or of the certificate of
                  incorporation or by-laws of the Company or result in the
                  material breach of, or constitute a material default or
                  require any consent under, or result in the creation of any
                  material lien, charge or other security interest or
                  encumbrance (except as may be required by the Agreement) upon
                  any property or assets of the Company pursuant to, any
                  indenture or other agreement or instrument to which the
                  Company is a party or by which the Company or any of its
                  property may be bound or affected.

                           3. No approval, license or consent of any
                  governmental regulatory body is requisite to the making and
                  performance by the Company of the Agreement or the execution,
                  delivery and payment of the Notes.

                           4. The Agreement and the Notes have been duly
                  executed and delivered by the Company and each constitutes a
                  valid and binding agreement of the Company enforceable in
                  accordance with its terms (subject to applicable bankruptcy,
                  fraudulent conveyance, fraudulent transfer, preferential
                  transfer, insolvency, moratorium and other like laws of
                  general application affecting creditors' rights and to the
                  application of general principles of equity, including without
                  limitation concepts of materiality, reasonableness, good faith
                  and fair dealing and whether considered in a proceeding in
                  equity or at law), except that we express no opinion as to (i)
                  Section 2.06(c) of the Agreement or (ii) the effect of the law
                  of any jurisdiction (other than the State of New York) wherein
                  any Bank (including any of its Applicable Lending Offices) may
                  be located which limits rates of interest which may be charged
                  or collected by such Bank or (iii) whether a Federal or state
                  court outside of the State of New York would give effect to
                  the choice of New York law provided for in the Agreement and
                  the Notes.

                  In connection with the above, we wish to point out that
provisions of the Agreement which permit any Agent or any Bank to take action or
make determinations or allocations, or to benefit from indemnities and similar
undertakings of the Company, may be subject to a requirement that such action be
taken or such determinations or allocations be made, 


                                       2
<PAGE>   76
and that any action or inaction by an Agent or a Bank which may give rise to a
request for payment under such an indemnity or similar undertaking be taken or
not taken, on a reasonable basis and in good faith.

                                        Very truly yours,










                                       3
<PAGE>   77
                                                                  (ATTACHMENT TO
                                                                      EXHIBIT B)



                      [Form of Opinion of General Counsel]

                                                                January __, 1998

Hughes Hubbard & Reed LLP
One Battery Park Plaza
New York, New York 10004

Dear Sirs:

                  As Executive Vice President and General Counsel of Sonat Inc.,
a Delaware corporation (the "Company"), I am familiar with the Credit Agreement
(the "Agreement") dated as of January 26, 1998, among the Company, the Banks
named therein and The Chase Manhattan Bank, as Administrative Agent, Morgan
Guaranty Trust Company of New York, as Syndication Agent and SunTrust Bank,
Atlanta, as Documentation Agent.

                  This opinion is delivered to you in connection with the
opinion which you are rendering pursuant to Section 4.01(v) of the Agreement.
You may rely on this opinion in rendering your opinion, you may attach a copy
hereof to your opinion and the Banks may rely on this opinion as if it were
addressed to them. All capitalized terms not otherwise defined herein shall have
the meaning attributed to them in the Agreement.

                  In this connection, and as a basis for the opinions expressed
below, I have examined or relied upon originals or copies certified or otherwise
identified to my satisfaction, of such records, instruments, certificates and
other documents, have made inquiries as to questions of fact of officers and
representatives of the Company and have made such examinations of law as I have
deemed necessary or appropriate for purposes of giving the opinions hereinafter
expressed.

                  On the basis of the foregoing, it is my opinion that:

                           1. The Company is duly licensed or qualified to do
                  business and is in good standing in the States of Alabama,
                  Texas and New York, constituting those states in which the
                  Company believes the conduct of its business or the ownership
                  of its assets requires such qualification.

                           2. The making and performance by the Company of the
                  Agreement and the Notes and borrowings under the Agreement do
                  not and will not contravene any provision of law of the State
                  of Alabama or the United States applicable to the Company by
                  virtue of the nature of its or any of its Subsidiaries'
                  businesses or of the properties owned or leased by any of them
                  or result in the material breach of, or constitute a material
                  default or require any consent under, or result in the
                  creation of any material lien, charge or other security
                  interest or encumbrance upon any property or assets of the
                  Company pursuant to, any 
<PAGE>   78
                  indenture or other agreement or instrument to which the
                  Company is a party or by which the Company or any of its
                  property may be bound or affected.

                           3. The Company is not an "investment company" or a
                  company "controlled" by an "investment company", within the
                  meaning of the Investment Company Act of 1940, as amended.

                           4. Neither the Company nor any of its Subsidiaries is
                  subject to regulation under the Public Utility Holding Company
                  Act of 1935, as amended.

                                        Very truly yours,








                                       2
<PAGE>   79
                                                                       EXHIBIT C

                       [Form of Opinion of Special Counsel


                          to the Banks and the Agents]

                                                                January __, 1998

To the Banks currently party to the 
Credit Agreement referred to below and
listed on Schedule 1 attached hereto; 
The Chase Manhattan Bank, as Administrative 
Agent, Morgan Guaranty Trust Company 
of New York, as Syndication Agent and 
SunTrust Bank, Atlanta, as Documentation 
Agent

Gentlemen:

                  We have acted as your special counsel in connection with the
Credit Agreement (the "Credit Agreement") dated as of January 26, 1998, among
Sonat Inc. (the "Company"), the Banks named therein and The Chase Manhattan
Bank, as Administrative Agent, Morgan Guaranty Trust Company of New York, as
Syndication Agent and SunTrust Bank, Atlanta, as Documentation Agent. Terms
defined in the Credit Agreement are used herein as defined therein.

                  We have assumed for purposes of our opinion hereinafter set
forth that the Credit Agreement has been duly authorized, executed and delivered
by the Company, each Bank and each Agent, and that the Company is duly
incorporated and validly existing under the laws of the State of Delaware and
has full power, authority and legal right to make and perform the Credit
Agreement and the Notes and that such execution, delivery and performance by the
Company does not contravene its certificate of incorporation or by-laws or
violate, or require any consent not obtained under, any applicable law or
regulation or any order, writ, injunction or decree of any court or other
governmental authority and does not violate, or require any consent not obtained
under, any contractual obligation applicable to or binding upon the Company.

                  We have examined (i) a copy of the Credit Agreement signed by
the Company, each Bank and each Agent and (ii) a copy of the opinion letter of
Hughes Hubbard & Reed LLP, counsel for the Company, addressed to you and dated
the date hereof in respect of the Credit Agreement together with the opinion of
the Executive Vice President and General Counsel of the Company, attached
thereto. We have assumed the genuineness of all signatures, the authenticity of
documents submitted to us as originals, the conformity with the originals of all
documents submitted to us as certified or photostatic copies, and the
authenticity of the originals of such latter documents.

                  Based upon the foregoing and subject to the comments and
qualifications set forth below, we are of the opinion that the Credit Agreement
constitutes, and the Notes when executed and delivered for value will
constitute, valid and binding obligations of the Company enforceable 
<PAGE>   80
in accordance with their respective terms, except as the foregoing may be
limited by bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium or other similar laws relating to or affecting creditors' rights
generally, general equitable principles (whether considered in a proceeding in
equity or at law) and an implied covenant of good faith and fair dealing, and
except that we express no opinion as to (i) Section 2.06(c) of the Credit
Agreement or (ii) the effect of the law of any jurisdiction (other than the
State of New York) wherein any Bank (including any of its Applicable Lending
Offices) may be located which limits rates of interest which may be charged or
collected by such Bank. In addition, we express no opinion as to whether a
Federal or state court outside of the State of New York would give effect to the
choice of New York law provided for in the Credit Agreement and the Notes.

                  In connection with the above, we wish to point out that
provisions of the Credit Agreement which permit either Agent or any Bank to take
action or make determinations, or to benefit from indemnities and similar
undertakings of the Company, may be subject to a requirement that such action be
taken or such determinations be made, and that any action or inaction by an
Agent or a Bank which may give rise to a request for payment under such an
undertaking be taken or not taken, on a reasonable basis and in good faith.

                  We are members of the Bar of the State of New York and do not
herein intend to express any opinion as to any matters governed by any laws
other than the law of the State of New York and the Federal law of the United
States of America.

                  This opinion is rendered to you in connection with the above
described transactions. This opinion may not be relied upon by you for any other
purpose, or relied upon by, or furnished to, any other person, firm or
corporation without our prior written consent.

                                        Very truly yours,






                                       2
<PAGE>   81
                                                                       EXHIBIT D



                      [Form of Money Market Quote Request]
                                                 [Date]

To:   [Bank]

From: Sonat Inc.

Re:   Money Market Quote Request

                  Pursuant to Section 1.02 of the Credit Agreement (the "Credit
Agreement") dated as of January 26, 1998, among Sonat Inc., the banks named
therein and The Chase Manhattan Bank, as Administrative Agent, Morgan Guaranty
Trust Company of New York, as Syndication Agent and SunTrust Bank, Atlanta, as
Documentation Agent, we hereby give notice that we request Money Market Quotes
for the following proposed Money Market Borrowing(s):

<TABLE>
<CAPTION>
      Borrowing         Quotation                                     Interest
         Date           Date [*1]          Amount [*2]               Period [*3]
      ---------         ---------          -----------               -----------
      <S>               <C>                <C>                       <C>

</TABLE>


                  Money Market Quotes responding to this Money Market Quote
Request must be submitted to us not later than [time and date] [*4].

                  Terms used herein have the meanings assigned to them in the
Credit Agreement.

                                        SONAT INC.



                                        By
                                             -----------------------------------
                                             Title:




- -----------------------------------

*        All numbered footnotes appear on last page of this Exhibit.

[1]      For use if a Money Market Rate in a Set Rate Auction is requested to be
         submitted before the Borrowing Date.

[2]      Each amount must be $25,000,000 or a larger multiple of $5,000,000.

[3]      A period of up to 180 days after the making of such Set Rate Loan and
         ending on a Business Day.

[4]      Insert time and date determined pursuant to Section 1.02(c)(i).
<PAGE>   82
                                                                       EXHIBIT E



                          [Form of Money Market Quote]

To:      Sonat Inc.

Attention:

Re:      Money Market Quote to Sonat Inc.
         (the "Borrower")

                  This Money Market Quote is given in accordance with Section
1.02(c) of the Credit Agreement (the "Credit Agreement") dated as of January 26,
1998, among the Borrower, the banks named therein and The Chase Manhattan Bank,
as Administrative Agent, Morgan Guaranty Trust Company of New York, as
Syndication Agent and SunTrust Bank, Atlanta, as Documentation Agent. Terms
defined in the Credit Agreement are used herein as defined therein.

                  In response to the Borrower's invitation dated ____________,
19__, we hereby make the following Money Market Quote(s) on the following terms:

                           1. Quoting Bank:

                           2. Person to contact at Quoting Bank:

                           3. We hereby offer to make Money Market Loan(s) in
                  the following principal amount[s], for the following Interest
                  Period(s) and at the following rate(s):

<TABLE>
<CAPTION>
     Borrowing        Quotation                               Interest
        Date          Date [*1]         Amount [*2]          Period [*3]        Rate [*4]
     ---------        ---------         -----------          -----------        ---------
     <S>              <C>               <C>                  <C>                <C>

</TABLE>

                  We understand and agree that the offer(s) set forth above,
subject to the satisfaction of the applicable conditions set forth in the Credit
Agreement, irrevocably obligate[s] us to make the Money Market Loan(s) for which
any offer(s) (is/are) accepted, in whole or in part (subject to the third
sentence of Section 1.02(d) of the Credit Agreement).

                                        Very truly yours,

                                        [Name of Bank]



                                        By
                                             -----------------------------------
                                             Authorized Officer

Dated: ____________,


<PAGE>   83
- -----------------------------------

*    All numbered footnotes appear on last page of this Exhibit.

[1]  As specified in the related Money Market Quote Request.

[2]  The principal amount bid for each Interest Period may not exceed the
     principal amount requested. Bids must be made for at least $5,000,000 or a
     larger multiple of $1,000,000.

[3]  A period of up to 180 days after the making of such Set Rate Loan and
     ending on a Business Day, as specified in the related Money Market Quote
     Request.

[4]  Specify rate of interest per annum (rounded to the nearest 1/10,000 of 1%).










                                       2
<PAGE>   84
                                                                       EXHIBIT F



                         [FORM OF DESIGNATION AGREEMENT]

                          Dated _______________, 199___



                  Reference is made to the Credit Agreement dated as of January
26, 1998 (as amended, supplemented or otherwise modified from time to time, the
"Credit Agreement") among Sonat Inc., a Delaware corporation (the "Company"),
the Banks parties thereto, The Chase Manhattan Bank, as Administrative Agent,
Morgan Guaranty Trust Company of New York, as Syndication Agent, and SunTrust
Bank, Atlanta, as Documentation Agent. Terms defined in the Credit Agreement are
used herein with the same meaning unless otherwise define herein.

                  [NAME OF DESIGNOR] (the "Designor"), [NAME OF DESIGNEE] (the
"Designee"), the Agent and the Borrower agree as follows:

                  1. The Designor hereby designates the Designee, and the
Designee hereby accepts such designation, to have a right to make Money Market
Loans pursuant to Section 1.02 of the Credit Agreement. Any assignment by
Designor to Designee of its rights to make a Money Market Loan pursuant to such
Section 1.02 shall be effective at the time of the funding for such Money Market
Loan and not before such time.

                  2. The Designor makes no representation or warranty and
assumes no responsibility pursuant to this Designation Agreement with respect to
(a) any statements, warranties or representations made in or in connection with
the Credit Agreement or the execution, legality, validity, enforceability,
genuineness, sufficiency or value of the Credit Agreement or any other
instrument and document furnished pursuant thereto and (b) the financial
condition of the Company or the performance or observance by the Company of its
obligations under the Credit Agreement or any other instrument or document
furnished pursuant thereto. (It is acknowledged that the Designor may make
representations and warranties of the type described above in other agreements
to which the Designor is a party.)

                  3. The Designee (a) confirms that it has received a copy of
the Credit Agreement, together with copies of the financial statements referred
to in Section 6.03 of the Credit Agreement and such other documents and
information as it has deemed appropriate to make its own independent credit
analysis and decision to enter into this Designation Agreement; (b) agrees that
it will, independently and without reliance upon any Agent, the Designor or any
other Bank and based on such documents and information as it shall deem
appropriate at the time, continue to make its own credit decisions in taking or
not taking action under the Credit Agreement; (c) confirms that it is an SPC;
(d) appoint and authorizes the Agents to take such action as agent on its behalf
and to exercise such powers and discretion under the Credit Agreement as are
delegated to the Agents by the terms thereof, together with such powers and
discretion as are reasonably incidental thereto; and (e) agrees that it will
perform in accordance 
<PAGE>   85
with their terms all of the obligations which by the terms of the Credit
Agreement are required to be performed by it as a Bank.

                  4. The Designee hereby appoints Designor (in Designor's
capacity as a the designating lender and not as the referral bank) as Designee's
agent and attorney in fact, and grants to Designor an irrevocable power of
attorney, to deliver and receive all communications and notices under the Credit
Agreement and to exercise on Designee's behalf all rights to vote and to grant
and made approvals, waivers, consents or amendment to or under the Credit
Agreement. Any document executed by the Designor on the Designee's behalf in
connection with the Credit Agreement shall be binding on the Designee. The
Company, the Agent and each of the Banks may rely on and are beneficiaries of
the preceding provisions.

                  5. Following the execution of this Designation Agreement by
the Designor and its Designee, it will be delivered to Chase for acceptance and
recording by Chase. The effective date for this Designation Agreement (the
"Effective Date") shall be the date of acceptance hereof by Chase, unless
otherwise specified on the signature page thereto.

                  6. The Designor unconditionally agrees to pay or reimburse the
Designee and save the Designee harmless against all liabilities, obligations,
losses, damages, penalties, actions, judgments, suits, costs, expenses or
disbursements of any kind or nature whatsoever which may be imposed or asserted
by any of the parties to the Credit Agreement against the Designee, in its
capacity as such, in any way relating to or arising out of this Designation
Agreement or any action taken or omitted by the Designee hereunder or
thereunder, provided that the Designor shall not be liable for any portion of
such liabilities, obligations, losses, damage, penalties, actions, judgments,
suits, costs, expenses or disbursements if the same results from the Designee's
gross negligence or willful misconduct.

                  7. Upon such acceptance and recording by Chase, as of the
Effective Date, the Designee shall be a party to the Credit Agreement with a
right to make Money Market Loans as a Bank pursuant to Section 1.02 of the
Credit Agreement and the rights and obligations of a Bank related thereto.

                  8. This Designation Agreement shall be governed by, and
construed in accordance with, the laws of the New York.

                  9. This Designation Agreement may be executed in any number of
counterparts and by different parties hereto in separate counterparts, each of
which when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement. Delivery of an executed
counterpart of a signature page to this Designation Agreement by facsimile
transmission shall be effective as delivery of a manually executed counterpart
of this Designation Agreement.




                                       2
<PAGE>   86
                  IN WITNESS WHEREOF, the Designor and the Designee, intending
to be legally bound, have caused this Designation Agreement to be executed by
their officers thereunto duly authorized as of the date first above written.

Effective Date(1): _______________, ____, 199__


                                        [NAME OF DESIGNOR], as Designor


                                        By:________________________________
                                        Title:_____________________________


                                        [NAME OF DESIGNEE], as Designee


                                        By:________________________________
                                        Title:_____________________________


                                        Applicable Lending Office (and address 
                                        for notices):

                                                     [ADDRESS]



Accepted this _____ day
of _______________, 199__


THE CHASE MANHATTAN BANK,                                   SONAT INC.
as Agent


By: ____________________________        By:________________________________
Title: _________________________        Title:_____________________________




- --------------------
1.       This date should be no earlier than five Business Days after the
         delivery of this Designation Agreement to the Agent.


                                       3

<PAGE>   1

                                                                    EXHIBIT 10.3

                              RESTRICTED STOCK PLAN
                                FOR DIRECTORS OF
                                   SONAT INC.
                (As Amended and Restated as of February 26, 1998)

         1. Purpose. This Restricted Stock Plan for Directors of Sonat Inc. (the
"Plan") is hereby established by Sonat Inc. (the "Company"). The purpose of the
Plan is to enable the Company to pay part of the compensation of its
non-employee Directors in shares of the Company's Common Stock, thereby
providing for or increasing such Directors' proprietary interest in the Company.
The Plan provides for the grant of shares of Common Stock of the Company which
are restricted in accordance with the terms and conditions set forth below
("Restricted Shares").

         2. Eligibility. Each Director of the Company who is not an officer or
employee of the Company or any of its subsidiaries (an "Eligible Director")
shall be eligible for awards under the Plan. Each Eligible Director to whom
Restricted Shares are granted under the Plan is hereinafter referred to as a
"Participant".

         3. Administration. The Plan shall be administered by a committee of at
least three Directors (the "Committee") appointed by the Board of Directors of
the Company (the "Board of Directors"). The Committee shall have authority to
interpret the Plan, to adopt, amend and rescind administrative regulations to
further the purposes of the Plan, and to take any other action necessary to the
proper operation of the Plan. All decisions and acts of the Committee shall be
final and binding upon all Plan Participants.

         4. Grant of Restricted Shares.

         (a)(1) Each Eligible Director who is a member of the Board of Directors
on April 1, 1998 shall be granted 2,000 Restricted Shares, effective as of April
1, 1998.

         (2) Each person who becomes an Eligible Director after April 1, 1998
shall be granted, effective as of the date such person becomes an Eligible
Director, a number of Restricted Shares equal to the sum of (i) the product of
33.33 multiplied by the number of full and partial calendar months between the
date of such person's election as an Eligible Director through the March 31
following such election, with such product rounded up or down to the nearest
whole share; plus (ii) 400 Restricted Shares for every full Plan Year (as
defined below) in the period commencing on the April 1 following such election
and ending on March 31, 2003. Plan Year shall mean the period April 1 through
the following March 31.

         (b) Awards under the Plan shall be made from shares held in the
Company's treasury.
<PAGE>   2


         5. Terms and Conditions of Restricted Shares. Stock certificates
representing the Restricted Shares granted to a Participant shall be registered
in the Participant's name and shall be held by the Company on behalf of the
Participant. The Participant shall have the right to vote and receive dividends
on such Restricted Shares. The Participant shall not be entitled to delivery of
the stock certificates, and no Restricted Share may be sold, transferred,
assigned, or pledged by the Participant, until such Restricted Share has vested,
as provided in Section 6. In the event a Participant ceases to be a Director of
the Company before all of his Restricted Shares have vested, any of such
Participant's Restricted Shares which have not vested shall be forfeited. At the
time Restricted Shares vest, a certificate for such shares shall be delivered to
the Participant (or the Participant's Beneficiary (as defined in Section 10) in
the event of the Participant's death), free of all restrictions.

         6.       Vesting of Restricted Shares.

         (a) With respect to Restricted Shares granted as of April 1, 1998, 400
shares shall vest on April 1 of each of the years 1999 through and including
2003. With respect to Restricted Shares granted after April 1, 1998, (i) on the
April 1 following such grant there shall vest a number of shares equal to the
product of 33.33 multiplied by the number of full or partial calendar months
from the date of such person's election as an Eligible Director through the
March 31 following such election, with such product rounded up or down to the
nearest whole share, and (ii) on each April 1 thereafter through April 1, 2003
there shall vest 400 shares.

         (b) Notwithstanding the provisions of Sections 5 and 6(a), all
Restricted Shares granted to a Participant shall vest immediately upon the
Participant's death or disability.

         (c) Notwithstanding the provisions of Sections 5, 6(a) and 6(b), in the
event of a "Change of Control" (as defined in Section 13), all Restricted Shares
shall vest immediately; however, stock certificates for such shares shall be
delivered to the Participants, and the restrictions on transfer of the shares
shall lapse, in the amounts and at the times set forth in Section 6(a),
regardless of whether the Participant is then serving as a Director of the
Company.

         7. Supplemental Payment on Vesting of Restricted Shares. Within 30 days
of each date that Restricted Shares vest, a Supplemental Payment shall be paid
to the Participant (or to the Participant's Beneficiary in the event of death),
in cash, in an amount equal to the amount necessary to pay the federal income
tax payable with respect to both the vesting of the Restricted Shares and
receipt of the Supplemental Payment, assuming the Participant is taxed at the
maximum effective federal income tax rate applicable thereto and has not elected
to recognize income with respect to the Restricted Shares before the date such
Restricted Shares vest.

         8. Regulatory Compliance. The Company shall not be obligated to issue
or deliver any Restricted Shares or certificates for Common Stock if (i) the
issuance or delivery of such shares shall constitute a violation of any
provision of any law or any regulation of any governmental authority or any
national securities exchange, or (ii) the Company determines that an agreement
by

                                      -2-
<PAGE>   3


a Participant with respect to the disposition of shares of Common Stock is
necessary or desirable (in connection with any requirement or interpretation of
any federal or state securities law, rule or regulation) and such agreement has
not been obtained.

         9. Adjustments for Changes in Capitalization. In the event of a
reorganization, recapitalization, stock split, stock dividend, combination of
shares, rights offer, liquidation, dissolution, merger, consolidation, spin-off,
sale of assets, payment of an extraordinary cash dividend, or any other change
in or affecting the corporate structure or capitalization of the Company, each
Restricted Share then outstanding shall be converted into or exchanged for the
number and kind of securities or property into which each outstanding share of
Common Stock of the Company shall be converted as a result of such event, and
the provisions of this Plan shall continue to apply to such substituted
securities or property.

         10. Beneficiary. A Participant may file with the Company a written
designation of Beneficiary, on such form as may be prescribed or permitted by
the Committee, to receive any Restricted Shares and Supplemental Payments that
become deliverable to the Participant pursuant to the Plan after the
Participant's death. A Participant may, from time to time, amend or revoke a
designation of Beneficiary. If no designated Beneficiary survives the
Participant, the Participant's estate shall be deemed to be the Participant's
Beneficiary.

         11. Amendment to Plan. The Board of Directors may amend the Plan from
time to time. No such amendment shall require approval by stockholders unless
stockholder approval is required by applicable law or stock exchange
requirements. No amendment shall adversely affect a Participant's right to
receive Restricted Shares granted under the Plan without the written consent of
the affected Participant.

         12. No Guaranty of Directorship. Nothing in this Plan shall be deemed
to create any obligation on the part of the Board to nominate any Director for
re-election by the Company's stockholders.

         13. Change of Control.

         A "Change of Control" shall mean:

             (i) The acquisition by any individual, entity or group (within
         the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange
         Act of 1934 (the "Exchange Act")) (a "Person") of beneficial ownership
         (within the meaning of Rule 13d-3 promulgated under the Exchange Act)
         of 20% or more of either (1) the then outstanding shares of common
         stock of the Company (the "Outstanding Common Stock") or (2) the
         combined voting power of the then outstanding voting securities of the
         Company entitled to vote generally in the election of directors (the
         "Outstanding Voting Securities"); provided, however, that for purposes
         of this subsection (i), the following acquisitions shall not constitute
         a Change of Control: (A) any acquisition directly from the Company, (B)
         any acquisition by the 

                                      -3-
<PAGE>   4

         Company, (C) any acquisition by any employee benefit plan (or related
         trust) sponsored or maintained by the Company or any corporation
         controlled by the Company or (D) any acquisition by any corporation
         pursuant to a transaction which complies with clauses (A), (B) and (C)
         of subsection (iii); or

                  (ii) Individuals who, as of December 1, 1995, constitute the
         Board of Directors (the "Incumbent Board") cease for any reason to
         constitute at least a majority of the Board of Directors; provided,
         however, that any individual becoming a director subsequent to such
         date whose election, or nomination for election by the Company's
         shareholders, was approved by a vote of at least a majority of the
         directors then comprising the Incumbent Board shall be considered as
         though such individual were a member of the Incumbent Board, but
         excluding, for this purpose, any such individual whose initial
         assumption of office occurs as a result of an actual or threatened
         election contest with respect to the election or removal of directors
         or other actual or threatened solicitation of proxies or consents by or
         on behalf of a Person other than the Board of Directors; or

                  (iii) Consummation of a reorganization, merger or
         consolidation or sale or other disposition of all or substantially all
         of the assets of the Company (a "Business Combination"), in each case,
         unless, following such Business Combination, (A) all or substantially
         all of the individuals and entities who were the beneficial owners,
         respectively, of the Outstanding Common Stock and Outstanding Voting
         Securities immediately prior to such Business Combination beneficially
         own, directly or indirectly, more than 50% of, respectively, the then
         outstanding shares of common stock and the combined voting power of the
         then outstanding voting securities entitled to vote generally in the
         election of directors, as the case may be, of the corporation resulting
         from such Business Combination (including, without limitation, a
         corporation which as a result of such transaction owns the Company or
         all or substantially all of the Company's assets either directly or
         through one or more subsidiaries) in substantially the same proportions
         as their ownership, immediately prior to such Business Combination, of
         the Outstanding Common Stock and Outstanding Voting Securities, as the
         case may be, (B) no Person (excluding any corporation resulting from
         such Business Combination or any employee benefit plan (or related
         trust) of the Company or such corporation resulting from such Business
         Combination) beneficially owns, directly or indirectly, 20% or more of,
         respectively, the then outstanding shares of common stock of the
         corporation resulting from such Business Combination or the combined
         voting power of the then outstanding voting securities of such
         corporation except to the extent that such ownership existed prior to
         the Business Combination and (C) at least a majority of the members of
         the board of directors of the corporation resulting from such Business
         Combination were members of the Incumbent Board at the time of the
         execution of the initial agreement, or of the action of the Board of
         Directors, providing for such Business Combination.

         14. Withholding. Whenever the Company proposes or is required to
deliver shares of Common Stock under the Plan, the Company shall have the right
to require the Participant to remit 


                                      -4-
<PAGE>   5

to the Company an amount sufficient to satisfy any federal, state or local
withholding tax liability prior to the delivery of any certificate or
certificates for such shares. Supplemental Payments under the Plan shall be net
of an amount sufficient to satisfy any federal, state and local withholding tax
liability on both the vesting of Restricted Shares and receipt of the
Supplemental Payment.

         15. Provisions Regarding Prior Grants. The provisions of the Plan as in
effect on February 25, 1998, shall apply with respect to all unvested Restricted
Shares outstanding on such date.

         16. Effective Date and Termination Date. This Plan, as amended and
restated herein, shall be effective as of February 26, 1998. The Plan's
termination date shall be April 1, 2003. The Board of Directors may terminate
the Plan prior to its termination date, but such action shall have no effect on
Restricted Shares granted prior to such action.

                                          SONAT INC.

                                 By:      /s/ Ronald L. Kuehn, Jr.
                                          --------------------------------------
                                          Ronald L. Kuehn, Jr.
                                          Chairman of the Board,
                                          President and Chief Executive Officer


                                      -5-

<PAGE>   1

                                                                    EXHIBIT 10.7

         EXECUTIVE SEVERANCE AGREEMENT, dated as of December 1, 1995, by and
between Sonat Inc., a Delaware
corporation ("Sonat"), and William A. Smith ("Executive").

         WHEREAS, the Executive Compensation Committee of the Board of Directors
of Sonat has recommended, and the Board of Directors has approved, that Sonat
enter into severance agreements with key executives of Sonat who are from time
to time designated by the Executive Compensation Committee;

         WHEREAS, Executive is a key executive of Sonat and has been selected by
the Executive Compensation Committee and the Board of Directors to enter into a
severance agreement with Sonat;

         WHEREAS, should Sonat become subject to any proposed or threatened
Change of Control (as hereinafter defined), the Board of Directors believes it
imperative that Sonat and the Board of Directors be able to rely upon Executive
to continue in his position, and that Sonat be able to receive and rely upon his
advice, if requested, as to the best interests of Sonat and its stockholders
without concern that he might be distracted by the personal uncertainties and
risks created by such a proposal or threat; and

         WHEREAS, should Sonat receive any such proposals, in addition to
Executive's regular duties, he may be called upon to assist in the assessment of
such proposals, advise management and the Board of Directors as to whether such
proposals would be in the best interests of Sonat and its stockholders, and to
take such other actions as the Board of Directors might determine to be
appropriate;

         NOW, THEREFORE, Sonat and Executive agree as follows:

         1. Services During Certain Events. In the event a third person begins a
tender or exchange offer, circulates a proxy to stockholders, or takes other
steps to effect a Change of Control, Executive agrees that he will not
voluntarily leave the employ of Sonat, and will render the services contemplated
in the recitals to this Agreement, until the third person has abandoned or
terminated his efforts to effect a Change of Control or until a Change of
Control has occurred.

         2. Termination Following Change of Control. Except as provided in
Section 4 hereof, Sonat will provide or cause to be provided to Executive the
rights and benefits described in Section 3 hereof in the event that Executive's
employment by Sonat is terminated:

                  (a) at any time within three years following a Change of
         Control by Sonat for reasons other than for "cause" (as such term is
         defined in Section 4 hereof) or other than as a consequence of
         Executive's death, permanent disability or


<PAGE>   2

         retirement at or after the normal retirement date as provided under the
         Sonat Inc. Retirement Plan (the "Retirement Plan") as in effect
         immediately preceding such date ("Normal Retirement Date");

                  (b) at any time within three years following a Change of
         Control by Executive following the occurrence of any of the following
         events without Executive's written consent:

                           (i) the assignment of Executive to any duties or
                  responsibilities that are inconsistent with his position,
                  duties, responsibilities or status immediately preceding such
                  Change of Control, or a change in his reporting
                  responsibilities or titles in effect at such time resulting in
                  a reduction of his responsibilities or position at Sonat;

                           (ii) the reduction of Executive's annual salary
                  (including any deferred portions thereof) or level of benefits
                  or supplemental compensation; or

                           (iii) the transfer of Executive to a location
                  requiring a change in his residence or a material increase in
                  the amount of travel normally required of Executive in
                  connection with his employment by Sonat; or

                  (c) by Executive for any reason during the 30-day period

         immediately following the first anniversary of the date of the Change
         of Control.

                  For purposes of this Agreement, "Change of Control" shall
mean:

                  A. The acquisition by any individual, entity or group (within
the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of
1934, as amended (the "Exchange Act")) (a "Person") of beneficial ownership
(within the meaning of Rule 13(d)-3 promulgated under the Exchange Act) of 20%
or more of either (i) the then outstanding shares of common stock of Sonat (the
"Outstanding Common Stock") or (ii) the combined voting power of the then
outstanding voting securities of Sonat entitled to vote generally in the
election of directors (the "Outstanding Voting Securities"); provided, however,
that for purposes of this subsection A, the following acquisitions shall not
constitute a Change of Control: (i) any acquisition directly from Sonat, (ii)
any acquisition by Sonat, (iii) any acquisition by any employee benefit plan (or
related trust) sponsored or maintained by Sonat or any corporation controlled by
Sonat or (iv) any acquisition by any corporation pursuant to a transaction which
complies with clauses (i), (ii) and (iii) of subsection C; or

                  B. Individuals who, as of the date hereof, constitute the
Board of Directors (the "Incumbent Board") cease for any reason to constitute at
least a majority of the Board of Directors; provided, however that any
individual becoming a director subsequent to the date hereof whose election, or
nomination for election by Sonat's 


                                       2
<PAGE>   3

shareholders, was approved by a vote of at least a majority of the directors
then comprising the Incumbent Board shall be considered as though such
individual were a member of the Incumbent Board, but excluding, for this
purpose, any such individual whose initial assumption of office occurs as a
result of an actual or threatened election contest with respect to the election
or removal of directors or other actual or threatened solicitation of proxies or
consents by or on behalf of a Person other than the Board of Directors; or

                  C. Consummation of a reorganization, merger or consolidation
or sale or other disposition of all or substantially all of the assets of Sonat
(a "Business Combination"), in each case, unless, following such Business
Combination, (i) all or substantially all of the individuals and entities who
were the beneficial owners, respectively, of the Outstanding Common Stock and
Outstanding Voting Securities immediately prior to such Business Combination
beneficially own, directly or indirectly, more than 50% of, respectively, the
then outstanding shares of common stock and the combined voting power of the
then outstanding voting securities entitled to vote generally in the election of
directors, as the case may be, of the corporation resulting from such Business
Combination (including, without limitation, a corporation which as a result of
such transaction owns Sonat or all or substantially all of Sonat's assets either
directly or through one or more subsidiaries) in substantially the same
proportions as their ownership, immediately prior to such Business Combination,
of the Outstanding Common Stock and Outstanding Voting Securities, as the case
may be, (ii) no Person (excluding any corporation resulting from such Business
Combination or any employee benefit plan (or related trust) of Sonat or such
corporation resulting from such Business Combination) beneficially owns,
directly or indirectly, 20% or more of, respectively, the then outstanding
shares of common stock of the corporation resulting from such Business
Combination or the combined voting power of the then outstanding voting
securities of such corporation except to the extent that such ownership existed
prior to the Business Combination and (iii) at least a majority of the members
of the board of directors of the corporation resulting from such Business
Combination were members of the Incumbent Board at the time of the execution of
the initial agreement, or of the action of the Board of Directors, providing for
such Business Combination.

         3. Rights and Benefits upon Termination. In the event of the
termination of Executive's employment under any of the circumstances set forth
in Section 2 hereof ("Termination"), Sonat agrees to provide or cause to be
provided to Executive the following rights and benefits:

                  (a) Salary and Other Payment at Termination. Executive shall
         be entitled to receive within 30 days of Termination a lump-sum payment
         in cash in the amount of three times Executive's highest Earnings (as
         such term is defined in this Section 3(a)) with respect to any 12
         consecutive month period during the three years ending with the date of
         Termination; provided, however, that if there are fewer than 36 months
         remaining from the date of Termination to Executive's Normal Retirement
         Date, the amount calculated pursuant to this paragraph will be reduced
         by multiplying such amount by a fraction, the numerator of which is the
         number of 

                                       3
<PAGE>   4


         months (including any fraction of a month) so remaining to Executive's
         Normal Retirement Date and the denominator of which is 36.

                           For purposes of this Agreement, "Earnings" shall mean
         the sum of (1) all base pay (including Before-Tax Contributions (as
         defined in Sonat's Savings Plan) made on behalf of Executive under
         Sonat's Savings Plan, and before-tax contributions by Executive to a
         plan established under Section 125 of the Internal Revenue Code, as
         amended (the "Code"), and sponsored by Sonat), overtime, cash bonuses
         (including bonuses paid under Sonat's Performance Award Plan, Cash
         Bonus Plan, Performance Award and Cash Bonus Plan, and All-Employee
         Incentive Program) and commissions paid to Executive for personal
         service rendered to Sonat and its subsidiaries and (2) workers'
         compensation payments or other comparable payments required to be made
         by law, received in lieu of base pay, but only to the extent that such
         payments do not exceed the rate of base pay of Executive immediately
         prior to the commencement of such payments.

                           Notwithstanding the provisions of the foregoing
         sentence, Earnings shall not include (1) severance pay, bonuses,
         workers' compensation payments, payment for unused vacation, and
         payments similar to any of the foregoing, received after or on account
         of Executive's Termination, (2) any income attributable to restricted
         stock, options, stock appreciation rights, supplemental payments, or
         dividends on restricted stock, acquired pursuant to Sonat's Executive
         Award Plan, or (3) any Choice Dollars (as defined in Sonat's Choice
         Benefits Plan) allocated to Executive under Sonat's Choice Benefits
         Plan, regardless of whether any Choice Dollars are paid to Executive in
         cash.

                  (b) Retirement Benefits. If Executive (i) has at Termination
         attained the age of 50 and (ii) at Termination is not otherwise
         entitled to receive an early retirement benefit under the terms of a
         qualified retirement plan of Sonat or its subsidiaries, Sonat shall pay
         in cash to Executive a monthly benefit for life (a "Severance
         Retirement Benefit") in an amount equal to the difference between (i)
         the monthly benefit calculated under the early retirement provisions of
         the Retirement Plan (as in effect immediately prior to the Change of
         Control), using the early retirement benefit reduction factors
         applicable as of the later of age 55 or the Executive's actual age at
         his date of Termination, and (ii) the monthly benefit payable to
         Executive under the Retirement Plan (as in effect on the date of
         Executive's Termination), assuming the following for purposes of
         clauses (i) and (ii): (A) the benefit is payable in the form of a
         single life annuity as of the later of the date Executive attains age
         55 and the date of Termination; (B) the benefit is calculated based on
         Executive's actual service and actual earnings history at the date of
         Termination; (C) Executive is fully vested in the benefit; and (D) the
         benefit is calculated under the assumption that Code Sections
         401(a)(17) and 415 are nonexistent and the provisions of the Retirement
         Plan incorporating such Sections are inoperative. The Severance
         Retirement Benefit shall be paid commencing on the first day of the
         month following the later of the date Executive attains age 55 


                                       4
<PAGE>   5

         and the date of Termination, and shall not be affected by the
         settlement option or date of commencement of any benefits actually
         payable under the Retirement Plan or the Sonat Inc. Supplemental
         Benefit Plan.

                  (c) Survivors' Benefits. If Executive is entitled to receive a
         Severance Retirement Benefit under Section 3(b) and Executive is
         survived by one or more Eligible Family Members (as such term is
         defined in the Retirement Plan as in effect immediately prior to the
         Change of Control), Sonat shall pay in cash to each such Eligible
         Family Member a monthly survivors' benefit (the "Severance Survivors'
         Benefit") in an amount equal to the excess of (i) over (ii), where

                           (i) is the monthly survivors benefit that would have
                  been payable to such Eligible Family Member under the
                  Retirement Plan (as in effect immediately prior to the Change
                  of Control) with respect to Executive if Executive's
                  retirement benefit were calculated under the early retirement
                  provisions of such plan, using the early retirement benefit
                  reduction factors applicable as of the later of age 55 or
                  Executive's actual age at his date of Termination, and
                  assuming (A) the retirement benefit is payable in the form of
                  a single life annuity as of the later of the date Executive
                  attains age 55 and the date of Termination; (B) the retirement
                  benefit is calculated based on Executive's actual service and
                  actual earnings history at the date of Termination; (C)
                  Executive is fully vested in the retirement benefit; and (D)
                  the retirement benefit is calculated under the assumption that
                  Code Sections 401(a)(17) and 415 are nonexistent and the
                  provisions of the Retirement Plan incorporating such Sections
                  are inoperative; and

                           (ii) is the amount actually paid to such Eligible
                  Family Member for such month as a Survivors' Benefit under the
                  Retirement Plan and as an Excess Retirement Plan Benefit under
                  the Sonat Inc. Supplemental Benefit Plan.

Payment of the Severance Survivors' Benefit shall commence on the first day of
the month following the death of Executive.

                  (d) Insurance and Other Special Benefits. To the extent
         Executive is eligible thereunder, Executive shall continue to be
         covered by the life and dependent life insurance, medical and dental
         insurance, and accident and disability insurance plans of Sonat and its
         subsidiaries or any successor plan or program in effect at Termination
         for employees in the same class or category as Executive, subject to
         the terms of such plans and to Executive's making any required
         contributions thereto. In the event Executive is ineligible to continue
         to be so covered under the terms of any such benefit plan or program,
         or, in the event Executive is eligible but the benefits applicable to
         Executive are not substantially equivalent to the benefits applicable
         to Executive immediately prior to Termination, then, for a period of 36
         months following Termination (or until Executive's Normal Retirement
         Date, 

                                       5
<PAGE>   6

         whichever is sooner), Sonat shall provide such substantially equivalent
         benefits, or such additional benefits as may be necessary to make the
         benefits applicable to Executive substantially equivalent to those in
         effect before Termination, through other sources; provided, however,
         that if during such period Executive should enter into the employ of
         another company or firm which provides substantially similar benefit
         coverage, Executive's participation in the comparable benefit provided
         by Sonat either directly or through such other sources shall cease.
         Nothing contained in this paragraph shall be deemed to require or
         permit termination or restriction of Executive's coverage under any
         plan or program of Sonat or any of its subsidiaries or any successor
         plan or program thereto to which Executive is entitled under the terms
         of such plan or program, whether at the end of the aforementioned
         36-month period or at any other time.

                  (e) Relocation Assistance. Should Executive move his residence
         in order to pursue other business opportunities within three years of
         the date of Termination (or until his Normal Retirement Date, whichever
         is sooner), Sonat shall reimburse him for any expenses incurred in that
         relocation (including taxes payable on the reimbursement) which are not
         reimbursed by another employer; provided, however, that Executive shall
         be entitled to such reimbursement with respect to only one such
         relocation, it being agreed that in the event of more than one such
         relocation, Executive shall be entitled to specify the relocation for
         which reimbursement hereunder is to be made. Benefits under this
         provision will include the assistance, at no cost to Executive, in
         selling his home and other assistance which was customarily provided to
         executives transferred within Sonat or between Sonat and its
         subsidiaries prior to the Change of Control.

                  (f) Other Benefits Plans. The specific arrangements referred
         to in this Section 3 are not intended to exclude Executive's
         participation in other benefit plans in which Executive currently
         participates or which are available to executive personnel generally in
         the class or category of Executive or to preclude other compensation or
         benefits as may be authorized by the Board of Directors from time to
         time.

                  (g) Duty to Mitigate. Executive's entitlement to benefits
         hereunder shall not be governed by any duty to mitigate his damages by
         seeking further employment nor offset by any compensation which he may
         receive from future employment.

                  (h) Payment Obligations Absolute. Sonat's obligation to pay or
         cause to be paid to Executive the benefits and to make the arrangements
         provided in this Section 3 shall be absolute and unconditional and
         shall not be affected by any circumstances, including, without
         limitation, any setoff, counterclaim, recoupment, defense or other
         right, which Sonat may have against Executive or anyone else. All
         amounts payable by or on behalf of Sonat hereunder shall be paid
         without notice or demand. Each and every payment made hereunder by or
         on behalf of Sonat shall be 

                                       6
<PAGE>   7

         final and Sonat and its subsidiaries shall not, for any reason
         whatsoever, seek to recover all or any part of such payment from
         Executive or from whomever shall be entitled thereto.

         4. Conditions to the Obligations of Sonat. Sonat shall have no
obligation to provide or cause to be provided to Executive the rights and
benefits described in Section 3 hereof if either of the following events shall
occur:

                  (a) Termination for Cause. Sonat shall terminate Executive's
         employment for "cause". For purposes of this Agreement, termination of
         employment for "cause" shall mean termination solely for dishonesty,
         conviction of a felony, or willful unauthorized disclosure of
         confidential information of Sonat.

                  (b) Resignation as Director. Executive shall not, promptly
         after Termination and upon receiving a written request to do so, resign
         as a director and/or officer of each subsidiary and affiliate of Sonat
         of which he is then serving as a director and/or officer.

         5.       Confidentiality; Non-Solicitation; Cooperation.

         (a) Confidentiality. Executive agrees that at all times following
Termination, he will not, without the prior written consent of Sonat, disclose
to any person, firm or corporation any confidential information of Sonat or its
subsidiaries which is now known to him or which hereafter may become known to
him as a result of his employment or association with Sonat and which could be
helpful to a competitor, unless such disclosure is required under the terms of a
valid and effective subpoena or order issued by a court or governmental body;
provided, however, that the foregoing shall not apply to confidential
information which becomes publicly disseminated by means other than a breach of
this Agreement.

         (b) Non-Solicitation. Executive agrees that for a period of three years
following the date of Termination (or until Executive's Normal Retirement Date,
whichever is sooner) he will not induce, either directly or indirectly, any
employee of senior to manager level of Sonat or any of its subsidiaries to
terminate his or her employment.

         (c) Cooperation. Executive agrees that, at all times following
Termination, he will furnish such information and render such assistance and
cooperation as may reasonably be requested in connection with any litigation or
legal proceedings concerning Sonat or any of its subsidiaries (other than any
legal proceedings concerning Executive's employment). In connection with such
cooperation, Sonat will pay or reimburse Executive for reasonable expenses.

         (d) Remedies for Breach. It is recognized that damages in the event of
breach of this Section 5 by Executive would be difficult, if not impossible, to
ascertain, and it is therefore agreed that Sonat, in addition to and without
limiting any other remedy or right it 


                                       7
<PAGE>   8

may have, shall have the right to an injunction or other equitable relief in any
court of competent jurisdiction, enjoining any such breach, and Executive hereby
waives any and all defenses he may have on the ground of lack of jurisdiction or
competence of the court to grant such an injunction or other equitable relief.
The existence of this right shall not preclude Sonat from pursuing any other
rights and remedies at law or in equity which Sonat may have.

         6. Certain Additional Payments by Sonat. (a) Anything in this Agreement
to the contrary notwithstanding and except as set forth below, in the event it
shall be determined that any payment or distribution by Sonat to or for the
benefit of Executive (whether paid or payable or distributed or distributable
pursuant to the terms of this Agreement or otherwise, but determined without
regard to any additional payments required under this Section 6) (a "Payment")
would be subject to the excise tax imposed by Section 4999 of the Code or any
interest or penalties are incurred by Executive with respect to such excise tax
(such excise tax, together with any such interest and penalties, are hereinafter
collectively referred to as the "Excise Tax"), then Executive shall be entitled
to receive an additional payment (a "Gross-Up Payment") in an amount such that
after payment by Executive of all federal income taxes (including any interest
or penalties imposed with respect to such taxes), including, without limitation,
any federal income taxes (and any interest and penalties imposed with respect
thereto) and Excise Tax imposed upon the Gross-Up Payment, Executive retains an
amount of the Gross-Up Payment equal to the Excise Tax imposed upon the
Payments. Notwithstanding the foregoing provisions of this Section 6(a), if it
shall be determined that Executive is entitled to a Gross-Up Payment, but that
Executive, after taking into account the Payments and the Gross-Up Payment,
would not receive a net after-tax benefit of at least $50,000 (taking into
account both federal income taxes and any Excise Tax) as compared to the net
after-tax proceeds to Executive resulting from an elimination of the Gross-Up
Payment and a reduction of the Payments, in the aggregate, to an amount (the
"Reduced Amount") such that the receipt of Payments would not give rise to any
Excise Tax, then no Gross-Up Payment shall be made to Executive and the
Payments, in the aggregate, shall be reduced to the Reduced Amount.

         (b) Subject to the provisions of Section 6(c), all determinations
required to be made under this Section 6, including whether and when a Gross-Up
Payment is required and the amount of such Gross-Up Payment and the assumptions
to be utilized in arriving at such determination, shall be made by Ernst & Young
LLP or such other certified public accounting firm as may be designated by
Executive (the "Accounting Firm"), which shall provide detailed supporting
calculations both to Sonat and Executive within 15 business days of the receipt
of notice from Executive that there has been a Payment or such earlier time as
is requested by Sonat. In the event that the Accounting Firm is serving as
accountant or auditor for the individual, entity or group effecting a Change of
Control, Executive shall appoint another nationally recognized accounting firm
to make the determinations required hereunder (which accounting firm shall then
be referred to as the Accounting Firm hereunder). All fees and expenses of the
Accounting Firm shall be borne solely by Sonat. Any Gross-Up Payment shall be
paid by Sonat to Executive within five days of the receipt of the


                                       8
<PAGE>   9

Accounting Firm's determination. Any determination by the Accounting Firm shall
be binding upon Sonat and Executive. As a result of the uncertainty in the
application of Section 4999 of the Code at the time of the initial determination
by the Accounting Firm hereunder, it is possible that Gross-Up Payments which
will not have been made by Sonat should have been made ("Underpayment"),
consistent with the calculations required to be made hereunder. In the event
that Sonat exhausts its remedies pursuant to Section 6(c) and Executive
thereafter is required to make a payment of any Excise Tax, the Accounting Firm
shall determine the amount of the Underpayment that has occurred and any such
Underpayment shall be promptly paid by Sonat to or for the benefit of Executive.

         (c) Executive shall notify Sonat in writing of any claim by the
Internal Revenue Service that, if successful, would require the payment by Sonat
of a Gross-Up Payment. Such notification shall be given as soon as practicable
but no later than ten business days after Executive is informed in writing of
such claim and shall apprise Sonat of the nature of such claim and the date on
which such claim is requested to be paid. Executive shall not pay such claim
prior to the expiration of the 30-day period following the date on which it
gives such notice to Sonat (or such shorter period ending on the date that any
payment of taxes with respect to such claim is due). If Sonat notifies Executive
in writing prior to the expiration of such period that it desires to contest
such claim, Executive shall:

                  (i) give Sonat any information reasonably requested by Sonat
         relating to such claim,

                  (ii) take such action in connection with contesting such claim
         as Sonat shall reasonably request in writing from time to time,
         including without limitation, accepting legal representation with
         respect to such claim by an attorney reasonably selected by Sonat,

                  (iii) cooperate with Sonat in good faith in order effectively
         to contest such claim, and

                  (iv) permit Sonat to participate in any proceedings relating
         to such claim;

provided, however, that Sonat shall bear and pay directly all costs and expenses
(including additional interest and penalties) incurred in connection with such
contest and shall indemnify and hold Executive harmless, on an after-tax basis,
for any Excise Tax or federal income tax (including interest and penalties with
respect thereto) imposed as a result of such representation and payment of costs
and expenses. Without limitation on the foregoing provisions of this Section
6(c), Sonat shall control all proceedings taken in connection with such contest
and, at its sole option, may pursue or forgo any and all administrative appeals,
proceedings, hearings and conferences with the taxing authority in respect of
such claim and may, at its sole option, either direct Executive to pay the tax
claimed and sue for a refund or to contest the claim in any permissible manner,
and Executive agrees to prosecute such contest to a determination before any
administrative tribunal, in a court of initial jurisdiction and in one or more
appellate courts, as Sonat shall determine; provided, however, that if


                                       9
<PAGE>   10

Sonat directs Executive to pay such claim and sue for a refund, Sonat shall
advance the amount of such payment to Executive, on an interest-free basis, and
shall indemnify and hold Executive harmless on an after-tax basis, from any
Excise Tax or federal income tax (including interest or penalties with respect
thereto) imposed with respect to such advance or with respect to any imputed
income with respect to such advance; and further provided that any extension of
the statute of limitations relating to payment of taxes for the taxable year of
Executive with respect to which such contested amount is claimed to be due is
limited solely to such contested amount. Furthermore, Sonat's control of the
contest shall be limited to issues with respect to which a Gross-Up Payment
would be payable hereunder, and Executive shall be entitled to settle or
contest, as the case may be, any other issue raised by the Internal Revenue
Service or any other taxing authority.

         (d) If, after the receipt by Executive of an amount advanced by Sonat
pursuant to Section 6(c), Executive becomes entitled to receive any refund with
respect to such claim, Executive shall (subject to Sonat's complying with the
requirements of Section 6(c)) promptly pay to Sonat the amount of such refund
(together with any interest paid or credited thereon after taxes applicable
thereto). If, after the receipt by Executive of an amount advanced by Sonat
pursuant to Section 6(c), a determination is made that Executive shall not be
entitled to any refund with respect to such claim and Sonat does not notify
Executive in writing of its intent to contest such denial of refund prior to the
expiration of 30 days after such determination, then such advance shall be
forgiven and shall not be required to be repaid and the amount of such advance
shall offset, to the extent thereof, the amount of Gross-Up Payment required to
be paid.

         7. Term of Agreement. This Agreement shall terminate on April 30, 1996;
provided, however, that this Agreement shall automatically renew for successive
one-year terms unless the Board of Directors notifies Executive in writing at
least 30 days prior to an April 30 expiration date that it does not desire to
renew the Agreement for an additional term; and provided further, however, that
this Agreement shall terminate prior to April 30, 1996 or, in the event of a
renewal of this Agreement, any subsequent April 30, if and when the Executive
Compensation Committee determines that Executive is no longer a key executive
for purposes of being a party to an executive severance agreement with Sonat and
so notifies Executive, except that such determination shall not be made, and if
made shall have no effect, (i) within three years after a Change of Control or
(ii) during any period of time when Sonat has reason to believe that any third
person has begun a tender or exchange offer, circulated a proxy to stockholders,
or taken other steps or formulated plans to effect a Change of Control, such
period of time to end when, in the opinion of the Executive Compensation
Committee, the third person has abandoned or terminated his efforts or plans to
effect a Change of Control.

         8. Expenses. Sonat shall pay or reimburse Executive for all costs and
expenses, including, without limitation, court costs and attorneys' fees,
incurred by Executive as a result of any claim, action or proceeding (including,
without limitation, a claim, action or proceeding by Executive against Sonat)
arising out of, or challenging the validity or enforceability of, this Agreement
or any provision hereof.

                                       10
<PAGE>   11

         9.       Miscellaneous.

         (a) Assignment. No right, benefit or interest hereunder shall be
subject to assignment, anticipation, alienation, sale, encumbrance, charge,
pledge, hypothecation or set-off in respect of any claim, debt or obligation, or
to execution, attachment, levy or similar process; provided, however, that
Executive may assign any right, benefit or interest hereunder if such assignment
is permitted under the terms of any plan or policy of insurance or annuity
contract governing such right, benefit or interest.

         (b) Construction of Agreement. Nothing in this Agreement shall be
construed to amend any provision of any plan or policy of Sonat. This Agreement
is not, and nothing herein shall be deemed to create, a commitment of continued
employment of Executive by Sonat or any of its subsidiaries.

         (c) Amendment. This Agreement may not be amended, modified or cancelled
except by written agreement of the parties.

         (d) Waiver. No provision of this Agreement may be waived except by a
writing signed by the party to be bound thereby.

             Executive may at any time or from time to time waive any or all of
the rights and benefits provided for herein which have not been received by
Executive at the time of such waiver. In addition, prior to the last day of the
calendar year in which Executive's Termination occurs, Executive may waive any
or all rights and benefits provided for herein which have been received by
Executive; provided that prior to the end of such year Executive repays to Sonat
(or, if the benefit was received from an employee benefit plan trust, to such
trust) the amount of the benefit received together with interest thereon at the
minimum rate required to avoid imputed income. Any waiver of benefits pursuant
to this paragraph shall be irrevocable. If Executive waives a right or benefit
provided for herein and such waiver is determined by the Internal Revenue
Service not to be effective, Sonat shall indemnify Executive for any federal
income and excise taxes he incurs as a result of that determination, so as to
put Executive in the position he would have been in had the waiver been given
effect.

         (e) Severability. In the event that any provision or portion of this
Agreement shall be determined to be invalid or unenforceable for any reason, the
remaining provisions of this Agreement shall remain in full force and effect to
the fullest extent permitted by law.

         (f) Successors. This Agreement shall be binding upon and inure to the
benefit of Executive and his personal representative and heirs, and Sonat and
any successor organization or organizations which shall succeed to substantially
all of the business and property of Sonat, whether by means of merger,
consolidation, acquisition of substantially all of the assets of Sonat or
otherwise, including by operation of law.

                                       11
<PAGE>   12

         (g) Taxes. Any payment or delivery required under this Agreement shall
be subject to all requirements of the law with regard to withholding of taxes,
filing, making of reports and the like, and Sonat shall use its best efforts to
satisfy promptly all such requirements.

         (h) Governing Law. This Agreement shall be governed and construed in
accordance with the laws of the State of Delaware.

         (i) Entire Agreement. This Agreement sets forth the entire agreement
and understanding of the parties hereto with respect to the matters covered
hereby.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
1st day of December, 1995.

                                              SONAT INC.



                                     By:      /s/ Ronald L. Kuehn, Jr.
                                              ---------------------------------
                                              Ronald L. Kuehn, Jr.
                                              Chairman of the Board, President
                                              and Chief Executive Officer



                                              /s/ William A. Smith
                                              ----------------------------------
                                              William A. Smith


                                       12

<PAGE>   13


                                    SCHEDULE

              SONAT INC. EXECUTIVES SIGNING NEW SEVERANCE AGREEMENT



         The following executives of Sonat Inc. executed severance agreements
substantially identical to the Executive Severance Agreement dated December 1,
1995, between Sonat Inc. and William A. Smith:


                           Thomas W. Barker, Jr.
                           Richard B. Bates
                           Beverley T. Krannich
                           James E. Moylan, Jr.
                           James A. Rubright


                                       13

<PAGE>   1



                                                                    EXHIBIT 10.8

     EXECUTIVE SEVERANCE AGREEMENT, as amended and restated as of January 22,
1998, by and between Sonat Inc., a Delaware corporation ("Sonat"), and Ronald L.
Kuehn, Jr. ("Executive").

     WHEREAS, the Executive Compensation Committee of the Board of Directors of
Sonat has recommended, and the Board of Directors has approved, that Sonat enter
into severance agreements with key executives of Sonat who are from time to time
designated by the Executive Compensation Committee;

     WHEREAS, Executive is a key executive of Sonat and has been selected by the
Executive Compensation Committee and the Board of Directors to enter into a
severance agreement with Sonat;

     WHEREAS, should Sonat become subject to any proposed or threatened Change
of Control (as hereinafter defined), the Board of Directors believes it
imperative that Sonat and the Board of Directors be able to rely upon Executive
to continue in his position, and that Sonat be able to receive and rely upon his
advice, if requested, as to the best interests of Sonat and its stockholders
without concern that he might be distracted by the personal uncertainties and
risks created by such a proposal or threat;

     WHEREAS, should Sonat receive any such proposals, in addition to
Executive's regular duties, he may be called upon to assist in the assessment of
such proposals, advise management and the Board of Directors as to whether such
proposals would be in the best interests of Sonat and its stockholders, and to
take such other actions as the Board of Directors might determine to be
appropriate; and

     WHEREAS, Sonat and Executive wish to amend and restate the Executive
Severance Agreement dated as of December 1, 1995, as set forth herein;

     NOW, THEREFORE, Sonat and Executive agree as follows:

     1. Services During Certain Events. In the event a third person begins a
tender or exchange offer, circulates a proxy to stockholders, or takes other
steps to effect a Change of Control, Executive agrees that he will not
voluntarily leave the employ of Sonat, and will render the services contemplated
in the recitals to this Agreement, until the third person has abandoned or
terminated his efforts to effect a Change of Control or until a Change of
Control has occurred.

     2. Termination Following Change of Control. Except as provided in Section 4
hereof, Sonat will provide or cause to be provided to Executive the 


<PAGE>   2

rights and benefits described in Section 3 hereof in the event that Executive's
employment by Sonat is terminated:

          (a) at any time within three years following a Change of Control by
     Sonat for reasons other than for "cause" (as such term is defined in
     Section 4 hereof) or other than as a consequence of Executive's death,
     permanent disability or retirement under the Sonat Inc. Retirement Plan
     (the "Retirement Plan") on or after April 1, 2001 ("Normal Retirement
     Date");

          (b) At any time within three years following a Change of Control by
     Executive following the occurrence of any of the following events without
     Executive's written consent:

               (i) the assignment of Executive to any duties or responsibilities
          that are inconsistent with his position, duties, responsibilities or
          status immediately preceding such Change of Control, or a change in
          his reporting responsibilities or titles in effect at such time
          resulting in a reduction of his responsibilities or position at Sonat;

               (ii) the reduction of Executive's annual salary (including any
          deferred portions thereof) or level of benefits or supplemental
          compensation; or

               (iii) the transfer of Executive to a location requiring a change
          in his residence or a material increase in the amount of travel
          normally required of Executive in connection with his employment by
          Sonat; or

          (c) by Executive for any reason during the 30-day period immediately
     following the first anniversary of the date of the Change of Control.

          For purposes of this Agreement, "Change of Control" shall mean:

     A. The acquisition by any individual, entity or group (within the meaning
of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act")) (a "Person") of beneficial ownership (within the
meaning of Rule 13(d)-3 promulgated under the Exchange Act) of 20% or more of
either (i) the then outstanding shares of common stock of Sonat (the
"Outstanding Common Stock") or (ii) the combined voting power of the then
outstanding voting securities of Sonat entitled to vote generally in the
election of directors (the "Outstanding


                                       2
<PAGE>   3

Voting Securities"); provided, however, that for purposes of this subsection A,
the following acquisitions shall not constitute a Change of Control: (i) any
acquisition directly from Sonat, (ii) any acquisition by Sonat, (iii) any
acquisition by any employee benefit plan (or related trust) sponsored or
maintained by Sonat or any corporation controlled by Sonat or (iv) any
acquisition by any corporation pursuant to a transaction which complies with
clauses (i), (ii) and (iii) of subsection C; or

     B. Individuals who, as of the date hereof, constitute the Board of
Directors (the "Incumbent Board") cease for any reason to constitute at least a
majority of the Board of Directors; provided, however, that any individual
becoming a director subsequent to the date hereof whose election, or nomination
for election by Sonat's shareholders, was approved by a vote of at least a
majority of the directors then comprising the Incumbent Board shall be
considered as though such individual were a member of the Incumbent Board, but
excluding, for this purpose, any such individual whose initial assumption of
office occurs as a result of an actual or threatened election contest with
respect to the election or removal of directors or other actual or threatened
solicitation of proxies or consents by or on behalf of a Person other than the
Board of Directors; or

     C. Consummation of a reorganization, merger or consolidation or sale or
other disposition of all or substantially all of the assets of Sonat (a
"Business Combination"), in each case, unless, following such Business
Combination, (i) all or substantially all of the individuals and entities who
were the beneficial owners, respectively, of the Outstanding Common Stock and
Outstanding Voting Securities immediately prior to such Business Combination
beneficially own, directly or indirectly, more than 50% of, respectively, the
then outstanding shares of common stock and the combined voting power of the
then outstanding voting securities entitled to vote generally in the election of
directors, as the case may be, of the corporation resulting from such Business
Combination (including, without limitation, a corporation which as a result of
such transaction owns Sonat or all or substantially all of Sonat's assets either
directly or through one or more subsidiaries) in substantially the same
proportions as their ownership, immediately prior to such Business Combination,
of the Outstanding Common Stock and Outstanding Voting Securities, as the case
may be, (ii) no Person (excluding any corporation resulting from such Business
Combination or any employee benefit plan (or related trust) of Sonat or such
corporation resulting from such Business Combination) beneficially owns,
directly or indirectly, 20% or more of, respectively, the then outstanding
shares of common stock of the corporation resulting from such Business
Combination or the combined voting power of the then outstanding voting
securities of such corporation except to the extent that such ownership existed
prior to the Business Combination and (iii) at least a majority of the members
of the board of directors of the


                                       3
<PAGE>   4

corporation resulting from such Business Combination were members of the
Incumbent Board at the time of the execution of the initial agreement, or of the
action of the Board of Directors, providing for such Business Combination.

     3. Rights and Benefits upon Termination. In the event of the termination of
Executive's employment under any of the circumstances set forth in Section 2
hereof ("Termination"), Sonat agrees to provide or cause to be provided to
Executive the following rights and benefits:

        (a) Salary and Other Payment at Termination. Executive shall be entitled
to receive within 30 days of Termination a lump-sum payment in cash in the
amount of three times Executive's highest Earnings (as such term is defined in
this Section 3 (a)) with respect to any 12 consecutive month period during the
three years ending with the date of Termination; provided, however, that if
there are fewer than 36 months remaining from the date of Termination to
Executive's Normal Retirement Date, the amount calculated pursuant to this
paragraph will be reduced by multiplying such amount by a fraction, the
numerator of which is the number of months (including any fraction of a month)
so remaining to Executive's Normal Retirement Date and the denominator of
which is 36.

        For purposes of this Agreement, "Earnings" shall mean the sum of (1)
all base pay (including Before-Tax Contributions (as defined in Sonat's Savings
Plan) made on behalf of Executive under Sonat's Savings Plan, and before-tax
contributions by Executive to a plan established under Section 125 of the
Internal Revenue Code, as amended (the "Code"), and sponsored by Sonat),
overtime, cash bonuses (including bonuses paid under Sonat's Performance Award
Plan, Cash Bonus Plan, Performance Award and Cash Bonus Plan, and All-Employee
Incentive Program) and commissions paid to Executive for personal service
rendered to Sonat and its subsidiaries and (2) workers' compensation payments or
other comparable payments required to be made by law, received in lieu of base
pay, but only to the extent that such payments do not exceed the rate of base
pay of Executive immediately prior to the commencement of such payments.

        Notwithstanding the provisions of the foregoing sentence, Earnings shall
not include (1) severance pay, bonuses, workers' compensation payments, payment
for unused vacation, and payments similar to any of the foregoing, received
after or on account of Executive's Termination, (2) any income attributable to
restricted stock, options, stock appreciation rights, supplemental payments, or
dividends on restricted stock, acquired pursuant to Sonat's Executive Award
Plan, or (3) any Choice Dollars (as defined in Sonat's Choice Benefits Plan)
allocated to


                                       4
<PAGE>   5

Executive under Sonat's Choice Benefits Plan, regardless of whether any Choice
Dollars are paid to Executive in cash.

     (b) Retirement Benefits. If Executive (i) has at Termination attained the
age of 50 and (ii) at Termination is not otherwise entitled to receive an early
retirement benefit under the terms of a qualified retirement plan of Sonat or
its subsidiaries, Sonat shall pay in cash to Executive a monthly benefit for
life (a "Severance Retirement Benefit") in an amount equal to the difference
between (a) the monthly benefit calculated under the early retirement provisions
of the Retirement Plan (as in effect immediately prior to the Change of
Control), using the early retirement benefit reduction factors applicable as of
the later of age 55 or the Executive's actual age at his date of Termination,
and (b) the monthly benefit payable to Executive under the Retirement Plan (as
in effect on the date of Executive's Termination), assuming the following for
purposes of clauses (a) and (b): (A) the benefit is payable in the form of a
single life annuity as of the later of the date Executive attains age 55 and the
date of Termination; (B) the benefit is calculated based on Executive's actual
service and actual earnings history at the date of Termination; (C) Executive is
fully vested in the benefit; and (D) the benefit is calculated under the
assumption that Code Sections 401(a)(17) and 415 are nonexistent and the
provisions of the Retirement Plan incorporating such Sections are inoperative.
The Severance Retirement Benefit shall be paid commencing on the first day of
the month following the later of the date Executive attains age 55 and the date
of Termination, and shall not be affected by the settlement option or date of
commencement of any benefit actually payable under the Retirement Plan or the
Sonat Inc. Supplemental Benefit Plan.

     (c) Survivors' Benefits. If Executive is entitled to receive a Severance
Retirement Benefit under Section 3(b) and Executive is survived by one or more
Eligible Family Members (as such term is defined in the Retirement Plan as in
effect immediately prior to the Change of Control), Sonat shall pay in cash to
each such Eligible Family Member a monthly survivors' benefit (the "Severance
Survivors' Benefit") in an amount equal to the excess of (i) over (ii), where

          (i) is the monthly survivors benefit that would have been payable to
     such Eligible Family Member under the Retirement Plan (as in effect
     immediately prior to the Change of Control) with respect to Executive if
     Executive's retirement benefit were calculated under the early retirement
     provisions of such plan, using the early retirement benefit reduction
     factors applicable as of the later of age 55 or Executive's actual age at
     his date of Termination, and assuming (A) the retirement benefit is payable
     in the form of


                                       5
<PAGE>   6

     a single life annuity as of the later of the date Executive attains age 55
     and the date of Termination; (B) the retirement benefit is calculated based
     on Executive's actual service and actual earnings history at the date of
     Termination; (C) Executive is fully vested in the retirement benefit; and
     (D) the retirement benefit is calculated under the assumption that Code
     Sections 401(a)(17) and 415 are nonexistent and the provisions of the
     Retirement Plan incorporating such Sections are inoperative; and

          (ii) is the amount actually paid to such Eligible Family Member for
     such month as a Survivors' Benefit under the Retirement Plan and as an
     Excess Retirement Plan Benefit under the Sonat Inc. Supplemental Benefit
     Plan.

Payment of the Severance Survivors' Benefit shall commence on the first day of
the month following the death of Executive.

          (d) Insurance and Other Special Benefits. To the extent Executive is
     eligible thereunder, Executive shall continue to be covered by the life and
     dependent life insurance, medical and dental insurance, and accident and
     disability insurance plans of Sonat and its subsidiaries or any successor
     plan or program in effect at Termination for employees in the same class or
     category as Executive, subject to the terms of such plans and to
     Executive's making any required contributions thereto. In the event
     Executive is ineligible to continue to be so covered under the terms of any
     such benefit plan or program, or, in the event Executive is eligible but
     the benefits applicable to Executive are not substantially equivalent to
     the benefits applicable to Executive immediately prior to Termination,
     then, for a period of 36 months following Termination (or until Executive's
     Normal Retirement Date, whichever is sooner), Sonat shall provide such
     substantially equivalent benefits, or such additional benefits as may be
     necessary to make the benefits applicable to Executive substantially
     equivalent to those in effect before Termination, through other sources;
     provided, however, that if during such period Executive should enter into
     the employ of another company or firm which provides substantially similar
     benefit coverage, Executive's participation in the comparable benefit
     provided by Sonat either directly or through such other sources shall
     cease. Nothing contained in this paragraph shall be deemed to require or
     permit termination or restriction of Executive's coverage under any plan or
     program of Sonat or any of its subsidiaries or any successor plan or
     program thereto to which Executive is entitled



                                       6
<PAGE>   7

     under the terms of such plan or program, whether at the end of the
     aforementioned 36-month period or at any other time.

          (e) Relocation Assistance. Should Executive move his residence in
     order to pursue other business opportunities within three years of the date
     of Termination (or until his Normal Retirement Date, whichever is sooner),
     Sonat shall reimburse him for any expenses incurred in that relocation
     (including taxes payable on the reimbursement) which are not reimbursed by
     another employer; provided, however, that Executive shall be entitled to
     such reimbursement with respect to only one such relocation, it being
     agreed that in the event of more than one such relocation, Executive shall
     be entitled to specify the relocation for which reimbursement hereunder is
     to be made. Benefits under this provision will include the assistance, at
     no cost to Executive, in selling his home and other assistance which was
     customarily provided to executives transferred within Sonat or between
     Sonat and its subsidiaries prior to the Change of Control.

          (f) Other Benefit Plans. The specific arrangements referred to in this
     Section 3 are not intended to exclude Executive's participation in other
     benefit plans in which Executive currently participates or which are
     available to executive personnel generally in the class or category of
     Executive or to preclude other compensation or benefits as may be
     authorized by the Board of Directors from time to time.

          (g) Duty to Mitigate. Executive's entitlement to benefits hereunder
     shall not be governed by any duty to mitigate his damages by seeking
     further employment nor offset by any compensation which he may receive from
     future employment.

          (h) Payment Obligations Absolute. Sonat's obligation to pay or cause
     to be paid to Executive the benefits and to make the arrangements provided
     in this Section 3 shall be absolute and unconditional and shall not be
     affected by any circumstances, including, without limitation, any setoff,
     counterclaim, recoupment, defense or other right, which Sonat may have
     against Executive or anyone else. All amounts payable by or on behalf of
     Sonat hereunder shall be paid without notice or demand. Each and every
     payment made hereunder by or on behalf of Sonat shall be final and Sonat
     and its subsidiaries shall not, for any reason whatsoever, seek to recover
     all or any part of such payment from Executive or from whomever shall be
     entitled thereto.


                                       7
<PAGE>   8

     4. Conditions to the Obligations of Sonat. Sonat shall have no obligation
to provide or cause to be provided to Executive the rights and benefits
described in Section 3 hereof if either of the following events shall occur:

          (a) Termination for Cause. Sonat shall terminate Executive's
     employment for "cause". For purposes of this Agreement, termination of
     employment for "cause" shall mean termination solely for dishonesty,
     conviction of a felony, or willful unauthorized disclosure of confidential
     information of Sonat.

          (b) Resignation as Director. Executive shall not, promptly after
     Termination and upon receiving a written request to do so, resign as a
     director and/or officer of each subsidiary and affiliate of Sonat of which
     he is then serving as a director and/or officer.

     5. Confidentiality; Non-Solicitation; Cooperation.

          (a) Confidentiality. Executive agrees that at all times following
     Termination, he will not, without the prior written consent of Sonat,
     disclose to any person, firm or corporation any confidential information of
     Sonat or its subsidiaries which is now known to him or which hereafter may
     become known to him as a result of his employment or association with Sonat
     and which could be helpful to a competitor, unless such disclosure is
     required under the terms of a valid and effective subpoena or order issued
     by a court or governmental body; provided, however, that the foregoing
     shall not apply to confidential information which becomes publicly
     disseminated by means other than a breach of this Agreement.

          (b) Non-Solicitation. Executive agrees that for a period of three
     years following the date of Termination (or until Executive's Normal
     Retirement Date, whichever is sooner) he will not induce, either directly
     or indirectly, any employee of senior to manager level of Sonat or any of
     its subsidiaries to terminate his or her employment.

          (c) Cooperation. Executive agrees that, at all times following
     Termination, he will furnish such information and render such assistance
     and cooperation as may reasonably be requested in connection with any
     litigation or legal proceedings concerning Sonat or any of its subsidiaries
     (other than any legal proceedings concerning Executive's employment). In
     connection with such cooperation, Sonat will pay or reimburse Executive for
     reasonable expenses.

          (d) Remedies for Breach. It is recognized that damages in the event of
     breach of this Section 5 by Executive would be difficult, if not
     impossible, to ascertain, and it is therefore agreed that Sonat, in
     addition to and without limiting any other remedy or right it may have,
     shall have


                                       8
<PAGE>   9


     the right to an injunction or other equitable relief in any court of
     competent jurisdiction, enjoining any such breach, and Executive hereby
     waives any and all defenses he may have on the ground of lack of
     jurisdiction or competence of the court to grant such an injunction or
     other equitable relief. The existence of this right shall not preclude
     Sonat from pursuing any other rights and remedies at law or in equity which
     Sonat may have.

          6.   Certain Additional Payments by Sonat.

          (a) Anything in this Agreement to the contrary notwithstanding and
     except as set forth below, in the event it shall be determined that any
     payment or distribution by Sonat to or for the benefit of Executive
     (whether paid or payable or distributed or distributable pursuant to the
     terms of this Agreement or otherwise, but determined without regard to any
     additional payments required under this Section 6) (a "Payment") would be
     subject to the excise tax imposed by Section 4999 of the Code or any
     interest or penalties are incurred by Executive with respect to such excise
     tax (such excise tax, together with any such interest and penalties, are
     hereinafter collectively referred to as the "Excise Tax"), then Executive
     shall be entitled to receive an additional payment (a "Gross-Up Payment")
     in an amount such that after payment by Executive of all federal income
     taxes (including any interest or penalties imposed with respect to such
     taxes), including, without limitation, any federal income taxes (and any
     interest and penalties imposed with respect thereto) and Excise Tax imposed
     upon the Gross-Up Payment, Executive retains an amount of the Gross-Up
     Payment equal to the Excise Tax imposed upon the Payments. Notwithstanding
     the foregoing provisions of this Section 6(a), if it shall be determined
     that Executive is entitled to a Gross-Up Payment, but that Executive, after
     taking into account the Payments and the Gross-Up Payment, would not
     receive a net after-tax benefit of at least $50,000 (taking into account
     both federal income taxes and any Excise Tax) as compared to the net
     after-tax proceeds to Executive resulting from an elimination of the
     Gross-Up Payment and a reduction of the Payments, in the aggregate, to an
     amount (the "Reduced Amount") such that the receipt of Payments would not
     give rise to any Excise Tax, then no Gross-Up Payment shall be made to
     Executive and the Payments, in the aggregate, shall be reduced to the
     Reduced Amount.

          (b) Subject to the provisions of Section 6(c), all determinations
     required to be made under this Section 6, including whether and when a
     Gross-Up Payment is required and the amount of such Gross-Up Payment and
     the assumptions to be utilized in arriving at such determination, shall be
     made by Ernst & Young LLP or such other certified public accounting firm as
     may be designated by Executive (the "Accounting Firm"), which shall provide
     detailed supporting calculations both to Sonat and Executive within 15
     business days of the receipt of


                                       9
<PAGE>   10


     notice from Executive that there has been a Payment or such earlier time as
     is requested by Sonat. In the event that the Accounting Firm is serving as
     accountant or auditor for the individual, entity or group effecting a
     Change of Control, Executive shall appoint another nationally recognized
     accounting firm to make the determinations required hereunder (which
     accounting firm shall then be referred to as the Accounting Firm
     hereunder). All fees and expenses of the Accounting Firm shall be borne
     solely by Sonat. Any Gross-Up Payment shall be paid by Sonat to Executive
     within five days of the receipt of the Accounting Firm's determination. Any
     determination by the Accounting Firm shall be binding upon Sonat and
     Executive. As a result of the uncertainty in the application of Section
     4999 of the Code at the time of the initial determination by the Accounting
     Firm hereunder, it is possible that Gross-Up Payments which will not have
     been made by Sonat should have been made ("Underpayment"), consistent with
     the calculations required to be made hereunder. In the event that Sonat
     exhausts its remedies pursuant to Section 6(c) and Executive thereafter is
     required to make a payment of any Excise Tax, the Accounting Firm shall
     determine the amount of the Underpayment that has occurred and any such
     Underpayment shall be promptly paid by Sonat to or for the benefit of
     Executive.

          (c) Executive shall notify Sonat in writing of any claim by the
     Internal Revenue Service that, if successful, would require the payment by
     Sonat of a Gross-Up Payment. Such notification shall be given as soon as
     practicable but no later than ten business days after Executive is informed
     in writing of such claim and shall apprise Sonat of the nature of such
     claim and the date on which such claim is requested to be paid. Executive
     shall not pay such claim prior to the expiration of the 30-day period
     following the date on which it gives such notice to Sonat (or such shorter
     period ending on the date that any payment of taxes with respect to such
     claim is due). If Sonat notifies Executive in writing prior to the
     expiration of such period that it desires to contest such claim, Executive
     shall:

          (i) give Sonat any information reasonably requested by Sonat relating
     to such claim,

          (ii) take such action in connection with contesting such claim as
     Sonat shall reasonably request in writing from time to time, including
     without limitation, accepting legal representation with respect to such
     claim by an attorney reasonably selected by Sonat,

          (iii) cooperate with Sonat in good faith in order effectively to
     contest such claim, and


                                       10
<PAGE>   11


          (iv) permit Sonat to participate in any proceedings relating to such
     claim;

     provided, however, that Sonat shall bear and pay directly all costs and
     expenses (including additional interest and penalties) incurred in
     connection with such contest and shall indemnify and hold Executive
     harmless, on an after-tax basis, for any Excise Tax or federal income tax
     (including interest and penalties with respect thereto) imposed as a result
     of such representation and payment of costs and expenses. Without
     limitation on the foregoing provisions of this Section 6(c), Sonat shall
     control all proceedings taken in connection with such contest and, at its
     sole option, may pursue or forgo any and all administrative appeals,
     proceedings, hearings and conferences with the taxing authority in respect
     of such claim and may, at its sole option, either direct Executive to pay
     the tax claimed and sue for a refund or to contest the claim in any
     permissible manner, and Executive agrees to prosecute such contest to a
     determination before any administrative tribunal, in a court of initial
     jurisdiction and in one or more appellate courts, as Sonat shall determine;
     provided, however, that if Sonat directs Executive to pay such claim and
     sue for a refund, Sonat shall advance the amount of such payment to
     Executive, on an interest-free basis, and shall indemnify and hold
     Executive harmless on an after-tax basis, from any Excise Tax or federal
     income tax (including interest or penalties with respect thereto) imposed
     with respect to such advance or with respect to any imputed income with
     respect to such advance; and further provided that any extension of the
     statute of limitations relating to payment of taxes for the taxable year of
     Executive with respect to such contested amount is claimed to be due is
     limited solely to such contested amount. Furthermore, Sonat's control of
     the contest shall be limited to issues with respect to which a Gross-Up
     Payment would be payable hereunder, and Executive shall be entitled to
     settle or contest, as the case may be, any other issue raised by the
     Internal Revenue Service or any other taxing authority.

          (d) If, after the receipt by Executive of an amount advanced by Sonat
     pursuant to Section 6(c), Executive becomes entitled to receive any refund
     with respect to such claim, Executive shall (subject to Sonat's complying
     with the requirements of Section 6(c)) promptly pay to Sonat the amount of
     such refund (together with any interest paid or credited thereon after
     taxes applicable thereto). If, after the receipt by Executive of an amount
     advanced by Sonat pursuant to Section 6(c), a determination is made that
     Executive shall not be entitled to any refund with respect to such claim
     and Sonat does not notify Executive in writing of its intent to contest
     such denial of refund prior to the expiration of 30 days after such
     determination, then such advance shall be forgiven and shall not be
     required to be repaid and the amount of such advance shall offset, to the
     extent thereof, the amount of Gross-Up Payment required to be paid.


                                       11
<PAGE>   12


     7. Term of Agreement. This Agreement shall terminate on April 30, 1999;
provided, however, that this Agreement shall automatically renew for successive
one-year terms unless the Board of Directors notifies Executive in writing at
least 30 days prior to an April 30 expiration date that it does not desire to
renew the Agreement for an additional term; and provided further, however, that
this Agreement shall terminate prior to April 30, 1999 or, in the event of a
renewal of this Agreement, any subsequent April 30, if and when the Executive
Compensation Committee determines that Executive is no longer a key executive
for purposes of being a party to an executive severance agreement with Sonat and
so notifies Executive, except that such determination shall not be made, and if
made shall have no effect, (i) within three years after a Change of Control or
(ii) during any period of time when Sonat has reason to believe that any third
person has begun a tender or exchange offer, circulated a proxy to stockholders,
or taken other steps or formulated plans to effect a Change of Control, such
period of time to end when, in the opinion of the Executive Compensation
Committee, the third person has abandoned or terminated his efforts or plans to
effect a Change of Control.

     8. Expenses. Sonat shall pay or reimburse Executive for all costs and
expenses, including, without limitation, court costs and attorneys' fees,
incurred by Executive as a result of any claim, action or proceeding (including,
without limitation, a claim, action or proceeding by Executive against Sonat)
arising out of, or challenging the validity or enforceability of, this Agreement
or any provision hereof.

     9. Miscellaneous.

     (a) Assignment. No right, benefit or interest hereunder shall be subject to
assignment, anticipation, alienation, sale, encumbrance, charge, pledge,
hypothecation or set-off in respect of any claim, debt or obligation, or to
execution, attachment, levy or similar process; provided, however, that
Executive may assign any right, benefit or interest hereunder if such assignment
is permitted under the terms of any plan or policy of insurance or annuity
contract governing such right, benefit or interest.

     (b) Construction of Agreement. Nothing in this Agreement shall be construed
to amend any provision of any plan or policy of Sonat. This Agreement is not,
and nothing herein shall be deemed to create, a commitment of continued
employment of Executive by Sonat or any of its subsidiaries.

     (c) Amendment. This Agreement may not be amended, modified or canceled
except by written agreement of the parties.


                                       12
<PAGE>   13


          (d) Waiver. No provision of this Agreement may be waived except by a
     writing signed by the party to be bound thereby.

              Executive may at any time or from time to time waive any or all of
     the rights and benefits provided for herein which have not been received by
     Executive at the time of such waiver. In addition, prior to the last day of
     the calendar year in which Executive's Termination occurs, Executive may
     waive any or all rights and benefits provided for herein which have been
     received by Executive; provided that prior to the end of such year
     Executive repays to Sonat (or, if the benefit was received from an employee
     benefit plan trust, to such trust) the amount of the benefit received
     together with interest thereon at the minimum rate required to avoid
     imputed income. Any waiver of benefits pursuant to this paragraph shall be
     irrevocable. If Executive waives a right or benefit provided for herein and
     such waiver is determined by the Internal Revenue Service not to be
     effective, Sonat shall indemnify Executive for any federal income and
     excise taxes he incurs as a result of that determination, so as to put
     Executive in the position he would have been in had the waiver been given
     effect.

          (e) Severability. In the event that any provision or portion of this
     Agreement shall be determined to be invalid or unenforceable for any
     reason, the remaining provisions of this Agreement shall remain in full
     force and effect to the fullest extent permitted by law.

          (f) Successors. This Agreement shall be binding upon and inure to the
     benefit of Executive and his personal representative and heirs, and Sonat
     and any successor organization or organizations which shall succeed to
     substantially all of the business and property of Sonat, whether by means
     of merger, consolidation, acquisition of substantially all of the assets of
     Sonat or otherwise, including by operation of law.

          (g) Taxes. Any payment or delivery required under this Agreement shall
     be subject to all requirements of the law with regard to withholding of
     taxes, filing, making of reports and the like, and Sonat shall use its best
     efforts to satisfy promptly all such requirements.

          (h) Governing Law. This Agreement shall be governed and construed in
     accordance with the laws of the State of Delaware.

          (i) Entire Agreement. This Agreement sets forth the entire agreement
     and understanding of the parties hereto with respect to the matters covered
     hereby.


                                       13
<PAGE>   14

          IN WITNESS WHEREOF, the parties have executed this Agreement as of
     January 22, 1998.

                                        SONAT INC.



                                        By:/s/ William A. Smith
                                           ---------------------------------  
                                           William A. Smith
                                           Executive Vice President and
                                              General Counsel



                                           /s/ Ronald L. Kuehn, Jr.
                                           ---------------------------------
                                           Ronald L. Kuehn, Jr.


                                       14

<PAGE>   1
                                                                    EXHIBIT 10.9

         EXECUTIVE SEVERANCE AGREEMENT, as amended and restated as of January
22, 1998, by and between Sonat Inc., a Delaware corporation ("Sonat"), and
Donald G. Russell ("Executive").

         WHEREAS, the Executive Compensation Committee of the Board of Directors
of Sonat has recommended, and the Board of Directors has approved, that Sonat
enter into severance agreements with key executives of Sonat who are from time
to time designated by the Executive Compensation Committee;

         WHEREAS, Executive is a key executive of Sonat and has been selected by
the Executive Compensation Committee and the Board of Directors to enter into a
severance agreement with Sonat;

         WHEREAS, should Sonat become subject to any proposed or threatened
Change of Control (as hereinafter defined), the Board of Directors believes it
imperative that Sonat and the Board of Directors be able to rely upon Executive
to continue in his position, and that Sonat be able to receive and rely upon his
advice, if requested, as to the best interests of Sonat and its stockholders
without concern that he might be distracted by the personal uncertainties and
risks created by such a proposal or threat;

         WHEREAS, should Sonat receive any such proposals, in addition to
Executive's regular duties, he may be called upon to assist in the assessment of
such proposals, advise management and the Board of Directors as to whether such
proposals would be in the best interests of Sonat and its stockholders, and to
take such other actions as the Board of Directors might determine to be
appropriate; and

         WHEREAS, Sonat and Executive wish to amend and restate the Executive
Severance Agreement dated as of December 1, 1995, as set forth herein;

         NOW, THEREFORE, Sonat and Executive agree as follows:

         1. Services During Certain Events. In the event a third person begins a
tender or exchange offer, circulates a proxy to stockholders, or takes other
steps to effect a Change of Control, Executive agrees that he will not
voluntarily leave the employ of Sonat, and will render the services contemplated
in the recitals to this Agreement, until the third person has abandoned or
terminated his efforts to effect a Change of Control or until a Change of
Control has occurred.

         2. Termination Following Change of Control. Except as provided in
Section 4 hereof, Sonat will provide or cause to be provided to Executive the

<PAGE>   2

rights and benefits described in Section 3 hereof in the event that Executive's
employment by Sonat is terminated:

                (a) at any time within three years following a Change of Control
        by Sonat for reasons other than for "cause" (as such term is defined in
        Section 4 hereof) or other than as a consequence of Executive's death,
        permanent disability or retirement under the Sonat Inc. Retirement Plan
        (the "Retirement Plan") on or after January 1, 2000 ("Normal Retirement
        Date");

                (b) At any time within three years following a Change of Control
        by Executive following the occurrence of any of the following events
        without Executive's written consent:

                         (i) the assignment of Executive to any duties or
                responsibilities that are inconsistent with his position,
                duties, responsibilities or status immediately preceding such
                Change of Control, or a change in his reporting responsibilities
                or titles in effect at such time resulting in a reduction of his
                responsibilities or position at Sonat;

                         (ii) the reduction of Executive's annual salary
                (including any deferred portions thereof) or level of benefits
                or supplemental compensation; or

                         (iii) the transfer of Executive to a location requiring
                a change in his residence or a material increase in the amount
                of travel normally required of Executive in connection with his
                employment by Sonat; or

                  (c) by Executive for any reason during the 30-day period
         immediately following the first anniversary of the date of the Change
         of Control.

                  For purposes of this Agreement, "Change of Control" shall
         mean:

         A. The acquisition by any individual, entity or group (within the
meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934,
as amended (the "Exchange Act")) (a "Person") of beneficial ownership (within
the meaning of Rule 13(d)-3 promulgated under the Exchange Act) of 20% or more
of either (i) the then outstanding shares of common stock of Sonat (the
"Outstanding Common Stock") or (ii) the combined voting power of the then
outstanding voting securities of Sonat entitled to vote generally in the
election of directors (the "Outstanding 

                                      -2-
<PAGE>   3

Voting Securities"); provided, however, that for purposes of this subsection A,
the following acquisitions shall not constitute a Change of Control: (i) any
acquisition directly from Sonat, (ii) any acquisition by Sonat, (iii) any
acquisition by any employee benefit plan (or related trust) sponsored or
maintained by Sonat or any corporation controlled by Sonat or (iv) any
acquisition by any corporation pursuant to a transaction which complies with
clauses (i), (ii) and (iii) of subsection C; or

         B. Individuals who, as of the date hereof, constitute the Board of
Directors (the "Incumbent Board") cease for any reason to constitute at least a
majority of the Board of Directors; provided, however, that any individual
becoming a director subsequent to the date hereof whose election, or nomination
for election by Sonat's shareholders, was approved by a vote of at least a
majority of the directors then comprising the Incumbent Board shall be
considered as though such individual were a member of the Incumbent Board, but
excluding, for this purpose, any such individual whose initial assumption of
office occurs as a result of an actual or threatened election contest with
respect to the election or removal of directors or other actual or threatened
solicitation of proxies or consents by or on behalf of a Person other than the
Board of Directors; or

         C. Consummation of a reorganization, merger or consolidation or sale or
other disposition of all or substantially all of the assets of Sonat (a
"Business Combination"), in each case, unless, following such Business
Combination, (i) all or substantially all of the individuals and entities who
were the beneficial owners, respectively, of the Outstanding Common Stock and
Outstanding Voting Securities immediately prior to such Business Combination
beneficially own, directly or indirectly, more than 50% of, respectively, the
then outstanding shares of common stock and the combined voting power of the
then outstanding voting securities entitled to vote generally in the election of
directors, as the case may be, of the corporation resulting from such Business
Combination (including, without limitation, a corporation which as a result of
such transaction owns Sonat or all or substantially all of Sonat's assets either
directly or through one or more subsidiaries) in substantially the same
proportions as their ownership, immediately prior to such Business Combination,
of the Outstanding Common Stock and Outstanding Voting Securities, as the case
may be, (ii) no Person (excluding any corporation resulting from such Business
Combination or any employee benefit plan (or related trust) of Sonat or such
corporation resulting from such Business Combination) beneficially owns,
directly or indirectly, 20% or more of, respectively, the then outstanding
shares of common stock of the corporation resulting from such Business
Combination or the combined voting power of the then outstanding voting
securities of such corporation except to the extent that such ownership existed
prior to the Business Combination and (iii) at least a majority of the members
of the board of directors of the


                                       3
<PAGE>   4

corporation resulting from such Business Combination were members of the
Incumbent Board at the time of the execution of the initial agreement, or of the
action of the Board of Directors, providing for such Business Combination.

         3. Rights and Benefits upon Termination. In the event of the
termination of Executive's employment under any of the circumstances set forth
in Section 2 hereof ("Termination"), Sonat agrees to provide or cause to be
provided to Executive the following rights and benefits:

                (a) Salary and Other Payment at Termination. Executive shall be
entitled to receive within 30 days of Termination a lump-sum payment in cash in
the amount of three times Executive's highest Earnings (as such term is defined
in this Section 3 (a)) with respect to any 12 consecutive month period during
the three years ending with the date of Termination; provided, however, that if
there are fewer than 36 months remaining from the date of Termination to
Executive's Normal Retirement Date, the amount calculated pursuant to this
paragraph will be reduced by multiplying such amount by a fraction, the
numerator of which is the number of months (including any fraction of a month)
so remaining to Executive's Normal Retirement Date and the denominator of which
is 36.

                  For purposes of this Agreement, "Earnings" shall mean the sum
of (1) all base pay (including Before-Tax Contributions (as defined in Sonat's
Savings Plan) made on behalf of Executive under Sonat's Savings Plan, and
before-tax contributions by Executive to a plan established under Section 125 of
the Internal Revenue Code, as amended (the "Code"), and sponsored by Sonat),
overtime, cash bonuses (including bonuses paid under Sonat's Performance Award
Plan, Cash Bonus Plan, Performance Award and Cash Bonus Plan, and All-Employee
Incentive Program) and commissions paid to Executive for personal service
rendered to Sonat and its subsidiaries and (2) workers' compensation payments or
other comparable payments required to be made by law, received in lieu of base
pay, but only to the extent that such payments do not exceed the rate of base
pay of Executive immediately prior to the commencement of such payments.

                  Notwithstanding the provisions of the foregoing sentence,
Earnings shall not include (1) severance pay, bonuses, workers' compensation
payments, payment for unused vacation, and payments similar to any of the
foregoing, received after or on account of Executive's Termination, (2) any
income attributable to restricted stock, options, stock appreciation rights,
supplemental payments, or dividends on restricted stock, acquired pursuant to
Sonat's Executive Award Plan, or (3) any Choice Dollars (as defined in Sonat's
Choice Benefits Plan) allocated to 

                                       4
<PAGE>   5

Executive under Sonat's Choice Benefits Plan, regardless of whether any Choice
Dollars are paid to Executive in cash.

         (b) Retirement Benefits. If Executive (i) has at Termination attained
the age of 50 and (ii) at Termination is not otherwise entitled to receive an
early retirement benefit under the terms of a qualified retirement plan of Sonat
or its subsidiaries, Sonat shall pay in cash to Executive a monthly benefit for
life (a "Severance Retirement Benefit") in an amount equal to the difference
between (a) the monthly benefit calculated under the early retirement provisions
of the Retirement Plan (as in effect immediately prior to the Change of
Control), using the early retirement benefit reduction factors applicable as of
the later of age 55 or the Executive's actual age at his date of Termination,
and (b) the monthly benefit payable to Executive under the Retirement Plan (as
in effect on the date of Executive's Termination), assuming the following for
purposes of clauses (a) and (b): (A) the benefit is payable in the form of a
single life annuity as of the later of the date Executive attains age 55 and the
date of Termination; (B) the benefit is calculated based on Executive's actual
service and actual earnings history at the date of Termination; (C) Executive is
fully vested in the benefit; and (D) the benefit is calculated under the
assumption that Code Sections 401(a)(17) and 415 are nonexistent and the
provisions of the Retirement Plan incorporating such Sections are inoperative.
The Severance Retirement Benefit shall be paid commencing on the first day of
the month following the later of the date Executive attains age 55 and the date
of Termination, and shall not be affected by the settlement option or date of
commencement of any benefit actually payable under the Retirement Plan or the
Sonat Inc. Supplemental Benefit Plan.

         (c) Survivors' Benefits. If Executive is entitled to receive a
Severance Retirement Benefit under Section 3(b) and Executive is survived by one
or more Eligible Family Members (as such term is defined in the Retirement Plan
as in effect immediately prior to the Change of Control), Sonat shall pay in
cash to each such Eligible Family Member a monthly survivors' benefit (the
"Severance Survivors' Benefit") in an amount equal to the excess of (i) over
(ii), where

                  (i) is the monthly survivors benefit that would have been
         payable to such Eligible Family Member under the Retirement Plan (as in
         effect immediately prior to the Change of Control) with respect to
         Executive if Executive's retirement benefit were calculated under the
         early retirement provisions of such plan, using the early retirement
         benefit reduction factors applicable as of the later of age 55 or
         Executive's actual age at his date of Termination, and assuming (A) the
         retirement benefit is payable in the form of

                                       5
<PAGE>   6

         a single life annuity as of the later of the date Executive attains age
         55 and the date of Termination; (B) the retirement benefit is
         calculated based on Executive's actual service and actual earnings
         history at the date of Termination; (C) Executive is fully vested in
         the retirement benefit; and (D) the retirement benefit is calculated
         under the assumption that Code Sections 401(a)(17) and 415 are
         nonexistent and the provisions of the Retirement Plan incorporating
         such Sections are inoperative; and

                  (ii) is the amount actually paid to such Eligible Family
         Member for such month as a Survivors' Benefit under the Retirement Plan
         and as an Excess Retirement Plan Benefit under the Sonat Inc.
         Supplemental Benefit Plan.

Payment of the Severance Survivors' Benefit shall commence on the first day of
the month following the death of Executive.

                  (d)  Insurance and Other Special Benefits. To the extent
         Executive is eligible thereunder, Executive shall continue to be
         covered by the life and dependent life insurance, medical and dental
         insurance, and accident and disability insurance plans of Sonat and its
         subsidiaries or any successor plan or program in effect at Termination
         for employees in the same class or category as Executive, subject to
         the terms of such plans and to Executive's making any required
         contributions thereto. In the event Executive is ineligible to continue
         to be so covered under the terms of any such benefit plan or program,
         or, in the event Executive is eligible but the benefits applicable to
         Executive are not substantially equivalent to the benefits applicable
         to Executive immediately prior to Termination, then, for a period of 36
         months following Termination (or until Executive's Normal Retirement
         Date, whichever is sooner), Sonat shall provide such substantially
         equivalent benefits, or such additional benefits as may be necessary to
         make the benefits applicable to Executive substantially equivalent to
         those in effect before Termination, through other sources; provided,
         however, that if during such period Executive should enter into the
         employ of another company or firm which provides substantially similar
         benefit coverage, Executive's participation in the comparable benefit
         provided by Sonat either directly or through such other sources shall
         cease. Nothing contained in this paragraph shall be deemed to require
         or permit termination or restriction of Executive's coverage under any
         plan or program of Sonat or any of its subsidiaries or any successor
         plan or program thereto to which Executive is entitled

                                       6
<PAGE>   7

         under the terms of such plan or program, whether at the end of the
         aforementioned 36-month period or at any other time.

                  (e) Relocation Assistance. Should Executive move his residence
         in order to pursue other business opportunities within three years of
         the date of Termination (or until his Normal Retirement Date, whichever
         is sooner), Sonat shall reimburse him for any expenses incurred in that
         relocation (including taxes payable on the reimbursement) which are not
         reimbursed by another employer; provided, however, that Executive shall
         be entitled to such reimbursement with respect to only one such
         relocation, it being agreed that in the event of more than one such
         relocation, Executive shall be entitled to specify the relocation for
         which reimbursement hereunder is to be made. Benefits under this
         provision will include the assistance, at no cost to Executive, in
         selling his home and other assistance which was customarily provided to
         executives transferred within Sonat or between Sonat and its
         subsidiaries prior to the Change of Control.

                  (f) Other Benefit Plans. The specific arrangements referred to
         in this Section 3 are not intended to exclude Executive's participation
         in other benefit plans in which Executive currently participates or
         which are available to executive personnel generally in the class or
         category of Executive or to preclude other compensation or benefits as
         may be authorized by the Board of Directors from time to time.

                  (g) Duty to Mitigate. Executive's entitlement to benefits
         hereunder shall not be governed by any duty to mitigate his damages by
         seeking further employment nor offset by any compensation which he may
         receive from future employment.

                  (h) Payment Obligations Absolute. Sonat's obligation to pay or
         cause to be paid to Executive the benefits and to make the arrangements
         provided in this Section 3 shall be absolute and unconditional and
         shall not be affected by any circumstances, including, without
         limitation, any setoff, counterclaim, recoupment, defense or other
         right, which Sonat may have against Executive or anyone else. All
         amounts payable by or on behalf of Sonat hereunder shall be paid
         without notice or demand. Each and every payment made hereunder by or
         on behalf of Sonat shall be final and Sonat and its subsidiaries shall
         not, for any reason whatsoever, seek to recover all or any part of such
         payment from Executive or from whomever shall be entitled thereto.

                                       7
<PAGE>   8

         4. Conditions to the Obligations of Sonat. Sonat shall have no
obligation to provide or cause to be provided to Executive the rights and
benefits described in Section 3 hereof if either of the following events shall
occur:

                  (a) Termination for Cause. Sonat shall terminate Executive's
         employment for "cause". For purposes of this Agreement, termination of
         employment for "cause" shall mean termination solely for dishonesty,
         conviction of a felony, or willful unauthorized disclosure of
         confidential information of Sonat.

                  (b) Resignation as Director. Executive shall not, promptly
         after Termination and upon receiving a written request to do so, resign
         as a director and/or officer of each subsidiary and affiliate of Sonat
         of which he is then serving as a director and/or officer.

         5.  Confidentiality; Non-Solicitation; Cooperation.

                  (a) Confidentiality. Executive agrees that at all times
         following Termination, he will not, without the prior written consent
         of Sonat, disclose to any person, firm or corporation any confidential
         information of Sonat or its subsidiaries which is now known to him or
         which hereafter may become known to him as a result of his employment
         or association with Sonat and which could be helpful to a competitor,
         unless such disclosure is required under the terms of a valid and
         effective subpoena or order issued by a court or governmental body;
         provided, however, that the foregoing shall not apply to confidential
         information which becomes publicly disseminated by means other than a
         breach of this Agreement.

                  (b) Non-Solicitation. Executive agrees that for a period of
         three years following the date of Termination (or until Executive's
         Normal Retirement Date, whichever is sooner) he will not induce, either
         directly or indirectly, any employee of senior to manager level of
         Sonat or any of its subsidiaries to terminate his or her employment.

                  (c) Cooperation. Executive agrees that, at all times following
         Termination, he will furnish such information and render such
         assistance and cooperation as may reasonably be requested in connection
         with any litigation or legal proceedings concerning Sonat or any of its
         subsidiaries (other than any legal proceedings concerning Executive's
         employment). In connection with such cooperation, Sonat will pay or
         reimburse Executive for reasonable expenses.

                  (d) Remedies for Breach. It is recognized that damages in the
         event of breach of this Section 5 by Executive would be difficult, if
         not impossible, to ascertain, and it is therefore agreed that Sonat, in
         addition to and without limiting any other remedy or right it may have,
         shall have

                                       8
<PAGE>   9

         the right to an injunction or other equitable relief in any court of
         competent jurisdiction, enjoining any such breach, and Executive hereby
         waives any and all defenses he may have on the ground of lack of
         jurisdiction or competence of the court to grant such an injunction or
         other equitable relief. The existence of this right shall not preclude
         Sonat from pursuing any other rights and remedies at law or in equity
         which Sonat may have.

                  6.  Certain Additional Payments by Sonat.

                  (a) Anything in this Agreement to the contrary notwithstanding
         and except as set forth below, in the event it shall be determined that
         any payment or distribution by Sonat to or for the benefit of Executive
         (whether paid or payable or distributed or distributable pursuant to
         the terms of this Agreement or otherwise, but determined without regard
         to any additional payments required under this Section 6) (a "Payment")
         would be subject to the excise tax imposed by Section 4999 of the Code
         or any interest or penalties are incurred by Executive with respect to
         such excise tax (such excise tax, together with any such interest and
         penalties, are hereinafter collectively referred to as the "Excise
         Tax"), then Executive shall be entitled to receive an additional
         payment (a "Gross-Up Payment") in an amount such that after payment by
         Executive of all federal income taxes (including any interest or
         penalties imposed with respect to such taxes), including, without
         limitation, any federal income taxes (and any interest and penalties
         imposed with respect thereto) and Excise Tax imposed upon the Gross-Up
         Payment, Executive retains an amount of the Gross-Up Payment equal to
         the Excise Tax imposed upon the Payments. Notwithstanding the foregoing
         provisions of this Section 6(a), if it shall be determined that
         Executive is entitled to a Gross-Up Payment, but that Executive, after
         taking into account the Payments and the Gross-Up Payment, would not
         receive a net after-tax benefit of at least $50,000 (taking into
         account both federal income taxes and any Excise Tax) as compared to
         the net after-tax proceeds to Executive resulting from an elimination
         of the Gross-Up Payment and a reduction of the Payments, in the
         aggregate, to an amount (the "Reduced Amount") such that the receipt of
         Payments would not give rise to any Excise Tax, then no Gross-Up
         Payment shall be made to Executive and the Payments, in the aggregate,
         shall be reduced to the Reduced Amount.

                  (b) Subject to the provisions of Section 6(c), all
         determinations required to be made under this Section 6, including
         whether and when a Gross-Up Payment is required and the amount of such
         Gross-Up Payment and the assumptions to be utilized in arriving at such
         determination, shall be made by Ernst & Young LLP or such other
         certified public accounting firm as may be designated by Executive (the
         "Accounting Firm"), which shall provide detailed supporting
         calculations both to Sonat and Executive within 15 business days of the
         receipt of

                                       9
<PAGE>   10

         notice from Executive that there has been a Payment or such earlier 
         time as is requested by Sonat. In the event that the Accounting
         Firm is serving as accountant or auditor for the individual, entity or
         group effecting a Change of Control, Executive shall appoint another
         nationally recognized accounting firm to make the determinations
         required hereunder (which accounting firm shall then be referred to as
         the Accounting Firm hereunder). All fees and expenses of the Accounting
         Firm shall be borne solely by Sonat. Any Gross-Up Payment shall be paid
         by Sonat to Executive within five days of the receipt of the Accounting
         Firm's determination. Any determination by the Accounting Firm shall be
         binding upon Sonat and Executive. As a result of the uncertainty in the
         application of Section 4999 of the Code at the time of the initial
         determination by the Accounting Firm hereunder, it is possible that
         Gross-Up Payments which will not have been made by Sonat should have
         been made ("Underpayment"), consistent with the calculations required
         to be made hereunder. In the event that Sonat exhausts its remedies
         pursuant to Section 6(c) and Executive thereafter is required to make a
         payment of any Excise Tax, the Accounting Firm shall determine the
         amount of the Underpayment that has occurred and any such Underpayment
         shall be promptly paid by Sonat to or for the benefit of Executive.

                  (c) Executive shall notify Sonat in writing of any claim by
         the Internal Revenue Service that, if successful, would require the
         payment by Sonat of a Gross-Up Payment. Such notification shall be
         given as soon as practicable but no later than ten business days after
         Executive is informed in writing of such claim and shall apprise Sonat
         of the nature of such claim and the date on which such claim is
         requested to be paid. Executive shall not pay such claim prior to the
         expiration of the 30-day period following the date on which it gives
         such notice to Sonat (or such shorter period ending on the date that
         any payment of taxes with respect to such claim is due). If Sonat
         notifies Executive in writing prior to the expiration of such period
         that it desires to contest such claim, Executive shall:

                  (i)   give Sonat any information reasonably requested by Sonat
         relating to such claim,

                  (ii)  take such action in connection with contesting such 
         claim as Sonat shall reasonably request in writing from time to time,
         including without limitation, accepting legal representation with
         respect to such claim by an attorney reasonably selected by Sonat,

                  (iii) cooperate with Sonat in good faith in order effectively
         to contest such claim, and

                                       10
<PAGE>   11

                  (iv)     permit Sonat to participate in any proceedings
         relating to such claim; provided, however, that Sonat shall bear and
         pay directly all costs and expenses (including additional interest and
         penalties) incurred in connection with such contest and shall indemnify
         and hold Executive harmless, on an after-tax basis, for any Excise Tax
         or federal income tax (including interest and penalties with respect
         thereto) imposed as a result of such representation and payment of
         costs and expenses. Without limitation on the foregoing provisions of
         this Section 6(c), Sonat shall control all proceedings taken in
         connection with such contest and, at its sole option, may pursue or
         forgo any and all administrative appeals, proceedings, hearings and
         conferences with the taxing authority in respect of such claim and may,
         at its sole option, either direct Executive to pay the tax claimed and
         sue for a refund or to contest the claim in any permissible manner, and
         Executive agrees to prosecute such contest to a determination before
         any administrative tribunal, in a court of initial jurisdiction and in
         one or more appellate courts, as Sonat shall determine; provided,
         however, that if Sonat directs Executive to pay such claim and sue for
         a refund, Sonat shall advance the amount of such payment to Executive,
         on an interest-free basis, and shall indemnify and hold Executive
         harmless on an after-tax basis, from any Excise Tax or federal income
         tax (including interest or penalties with respect thereto) imposed with
         respect to such advance or with respect to any imputed income with
         respect to such advance; and further provided that any extension of the
         statute of limitations relating to payment of taxes for the taxable
         year of Executive with respect to such contested amount is claimed to
         be due is limited solely to such contested amount. Furthermore, Sonat's
         control of the contest shall be limited to issues with respect to which
         a Gross-Up Payment would be payable hereunder, and Executive shall be
         entitled to settle or contest, as the case may be, any other issue
         raised by the Internal Revenue Service or any other taxing authority.

                  (d) If, after the receipt by Executive of an amount advanced
         by Sonat pursuant to Section 6(c), Executive becomes entitled to
         receive any refund with respect to such claim, Executive shall (subject
         to Sonat's complying with the requirements of Section 6(c)) promptly
         pay to Sonat the amount of such refund (together with any interest paid
         or credited thereon after taxes applicable thereto). If, after the
         receipt by Executive of an amount advanced by Sonat pursuant to Section
         6(c), a determination is made that Executive shall not be entitled to
         any refund with respect to such claim and Sonat does not notify
         Executive in writing of its intent to contest such denial of refund
         prior to the expiration of 30 days after such determination, then such
         advance shall be forgiven and shall not be required to be repaid and
         the amount of such advance shall offset, to the extent thereof, the
         amount of Gross-Up Payment required to be paid.

                                       11
<PAGE>   12

                  7. Term of Agreement. This Agreement shall terminate on April
         30, 1999; provided, however, that this Agreement shall automatically
         renew for successive one-year terms unless the Board of Directors
         notifies Executive in writing at least 30 days prior to an April 30
         expiration date that it does not desire to renew the Agreement for an
         additional term; and provided further, however, that this Agreement
         shall terminate prior to April 30, 1999 or, in the event of a renewal
         of this Agreement, any subsequent April 30, if and when the Executive
         Compensation Committee determines that Executive is no longer a key
         executive for purposes of being a party to an executive severance
         agreement with Sonat and so notifies Executive, except that such
         determination shall not be made, and if made shall have no effect, (i)
         within three years after a Change of Control or (ii) during any period
         of time when Sonat has reason to believe that any third person has
         begun a tender or exchange offer, circulated a proxy to stockholders,
         or taken other steps or formulated plans to effect a Change of Control,
         such period of time to end when, in the opinion of the Executive
         Compensation Committee, the third person has abandoned or terminated
         his efforts or plans to effect a Change of Control.

                  8. Expenses. Sonat shall pay or reimburse Executive for all
         costs and expenses, including, without limitation, court costs and
         attorneys' fees, incurred by Executive as a result of any claim, action
         or proceeding (including, without limitation, a claim, action or
         proceeding by Executive against Sonat) arising out of, or challenging
         the validity or enforceability of, this Agreement or any provision
         hereof.

                  9.  Miscellaneous.

                  (a) Assignment. No right, benefit or interest hereunder shall
         be subject to assignment, anticipation, alienation, sale, encumbrance,
         charge, pledge, hypothecation or set-off in respect of any claim, debt
         or obligation, or to execution, attachment, levy or similar process;
         provided, however, that Executive may assign any right, benefit or
         interest hereunder if such assignment is permitted under the terms of
         any plan or policy of insurance or annuity contract governing such
         right, benefit or interest.

                  (b) Construction of Agreement. Nothing in this Agreement shall
         be construed to amend any provision of any plan or policy of Sonat.
         This Agreement is not, and nothing herein shall be deemed to create, a
         commitment of continued employment of Executive by Sonat or any of its
         subsidiaries.

                  (c) Amendment. This Agreement may not be amended, modified or
         canceled except by written agreement of the parties.

                                       12
<PAGE>   13

                  (d) Waiver. No provision of this Agreement may be waived
         except by a writing signed by the party to be bound thereby.

                      Executive may at any time or from time to time waive any 
         or all of the rights and benefits provided for herein which have not
         been received by Executive at the time of such waiver. In addition,
         prior to the last day of the calendar year in which Executive's
         Termination occurs, Executive may waive any or all rights and benefits
         provided for herein which have been received by Executive; provided
         that prior to the end of such year Executive repays to Sonat (or, if
         the benefit was received from an employee benefit plan trust, to such
         trust) the amount of the benefit received together with interest
         thereon at the minimum rate required to avoid imputed income. Any
         waiver of benefits pursuant to this paragraph shall be irrevocable. If
         Executive waives a right or benefit provided for herein and such waiver
         is determined by the Internal Revenue Service not to be effective,
         Sonat shall indemnify Executive for any federal income and excise taxes
         he incurs as a result of that determination, so as to put Executive in
         the position he would have been in had the waiver been given effect.

                  (e) Severability. In the event that any provision or portion
         of this Agreement shall be determined to be invalid or unenforceable
         for any reason, the remaining provisions of this Agreement shall remain
         in full force and effect to the fullest extent permitted by law.

                  (f) Successors. This Agreement shall be binding upon and inure
         to the benefit of Executive and his personal representative and heirs,
         and Sonat and any successor organization or organizations which shall
         succeed to substantially all of the business and property of Sonat,
         whether by means of merger, consolidation, acquisition of substantially
         all of the assets of Sonat or otherwise, including by operation of law.

                  (g) Taxes. Any payment or delivery required under this
         Agreement shall be subject to all requirements of the law with regard
         to withholding of taxes, filing, making of reports and the like, and
         Sonat shall use its best efforts to satisfy promptly all such
         requirements.

                  (h) Governing Law. This Agreement shall be governed and
         construed in accordance with the laws of the State of Delaware.

                  (i) Entire Agreement. This Agreement sets forth the entire
         agreement and understanding of the parties hereto with respect to the
         matters covered hereby.


                                       13
<PAGE>   14


                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of January 22, 1998.

                                   SONAT INC.



                                   By: /s/ Ronald L. Kuehn, Jr.
                                      ----------------------------------------
                                       Ronald L. Kuehn, Jr.
                                       Chairman of the Board, President
                                       and Chief Executive Officer



                                       /s/ Donald G. Russell
                                       ---------------------------------------
                                            Donald G. Russell


                                       14




<PAGE>   1
                                                                   EXHIBIT 10.10

                                   SONAT INC.
                          DIRECTOR'S FEES DEFERRAL PLAN
            (AS AMENDED AND RESTATED EFFECTIVE AS OF JANUARY 1, 1997)

                                    ARTICLE I

                                     PURPOSE

1.1      Purpose.

         The purpose of this Director's Fees Deferral Plan (the "Plan") is to
enable Sonat Inc. (the "Company") to attract and retain Directors of outstanding
ability by providing them with a plan to allow them to defer and accumulate
Director's fees. For purposes of this Plan, Director's fees shall mean the
retainer fee and fees for attendance at meetings of the Board of Directors and
Board committees.

                                   ARTICLE II

                               DEFERRAL ELECTIONS

2.1      Deferral Election.

         At any time before the beginning of a calendar year, a Director may
elect (the "Deferral Election") that all or (subject to any limitations imposed
by the Company) any specified portion of the Director's fees earned from the
Company during such calendar year shall be credited to an Account maintained on
such Director's behalf in lieu of payment in cash. A Director shall also have
the right to make a Deferral Election during the 30 days following the date on
which the Director first becomes eligible to receive Director's fees. Any
Deferral Election made pursuant to the preceding sentence shall be made only
with respect to Director's fees earned following such Deferral Election. Each
Deferral Election shall be submitted to the Company in writing.

2.2      Effect of Deferral Election.

         Pursuant to an effective Deferral Election, the Company (a) shall not
pay in cash the fees covered thereby, (b) shall credit the Director's Account as
provided in Article III, and (c) shall debit the Director's Account and make
payments therefrom as provided in Article IV.

2.3      Renewal of Elections.

         Once a Deferral Election has been made, it shall be automatically
renewed from year to year unless the Director elects to change or revoke such
election. However, a change or revocation of a Deferral Election shall be
effective only with respect to Director's fees earned after the commencement of
the calendar year next following such change or revocation.



<PAGE>   2

                                   ARTICLE III

                          CREDITS TO DIRECTOR'S ACCOUNT

3.1      Crediting of Contributions.

         The Company shall create and maintain on its books a Director's Account
for each Director who has made a Deferral Election under Section 2.1. The
Company shall credit to such Account the amount of any Director's fee which
would have been paid to the Director but which is not paid to the Director
pursuant to such Deferral Election. Such credit to the Director's Account shall
be as of the date the fee would have been payable in cash if the Director's
Deferral Election were inoperative.

3.2      Subaccounts.

         The Company shall establish in each Director's Account a subaccount
(the "Phantom Stock Subaccount") that is deemed invested in units ("Units") of
the Sonat Stock Fund established under the Company's Savings Plan (the "Sonat
Stock Fund") and subaccounts which are deemed invested in shares of mutual fund
investments designated by the Company (each of such subaccounts referred to as a
"Phantom Mutual Fund Subaccount"). Amounts shall be credited to such Subaccounts
as directed by the Director, as provided in Section 3.4. The Director's Phantom
Stock Subaccount and each Phantom Mutual Fund Subaccount shall be credited with
the number of phantom Units or phantom shares (including fractional Units or
shares) equal to the number of Units or shares which could have been purchased
with the dollar amount to be credited, valued at the closing price of such Unit
or share on the business day such amounts are credited. At the time that any
dividends are paid on the Sonat Stock Fund or the applicable mutual fund, as the
case may be, the Director's Phantom Stock Subaccount or Phantom Mutual Fund
Subaccount, as the case may be, shall be adjusted to reflect such dividend
payment in a manner consistent with the treatment of accounts that are actually
invested in the Sonat Stock Fund or the applicable mutual fund, as the case may
be.

3.3      Determination of Fair Market Value.

         Except as provided in Article IV, the fair market value of a Phantom
Stock Subaccount or a Phantom Mutual Fund Subaccount, as the case may be, on any
given date shall be determined by multiplying (a) the number of phantom Units or
shares credited to such Subaccount on such date, by (b) the closing price of a
Unit or share (of the Sonat Stock Fund or of such mutual fund, as the case may
be) as of such date (or, if such date is not a business day, on the preceding
business day).

3.4      Investment Elections and Transfers.

         (a)  Contributions. At the time of making a Deferral Election or on any
business day thereafter, a Director may elect (in the manner and subject to any
limitations specified by the Company) to designate the Subaccounts to which new
contributions to the Director's Account shall be credited. All amounts credited
to the Director's Account 



                                       2


<PAGE>   3

on or after the date of such an election shall be credited in accordance with
such election. The Director may make a new election on any business day (in the
manner and subject to any limitations specified by the Company), which shall
take effect on the close of business on the day the Company receives such
election. If a Director fails to make an election, all amounts subsequently
credited to such Account before the effective date of a properly-made election
shall be credited as phantom shares of the Benchmark Government Portfolio (or
such other short-term money market investment as the Company may designate).

         (b)  Transfers Among Subaccounts. A Director may elect on any
business day (in the manner and subject to any limitations specified by the
Company) to transfer a portion of his or her Account from one Subaccount to
another. Transfers shall be made as of the close of business on the day the
Company receives the election, based on the respective closing prices of the
respective phantom Units or shares on such business day. Notwithstanding the
foregoing provisions, a Director may not transfer among his or her Subaccounts
on or after a Lump Sum Valuation Date, or during the period beginning on an
Installment Valuation Date and ending upon the close of business on the next
Installment Payment Date (as such terms are defined in Sections 4.2 and 4.3).

3.5      Antidilution Adjustments.

         In the event of a reorganization, recapitalization, stock split, stock
dividend, combination of shares, rights offer, liquidation, dissolution, merger,
consolidation, spin-off, sale of assets, or other change in or affecting the
corporate structure or capitalization of the Company, the Board of Directors of
the Company shall make the appropriate adjustment to the Phantom Stock
Subaccounts of Directors so that the phantom Units therein shall be treated as
if they were actual Units. In the event the Common Stock is converted into cash
or other securities or property, the value of the Units on the date of such
conversion shall be determined by AmSouth Bank NA, the phantom Units shall be
converted into cash based on such value, and credited as phantom shares of the
Benchmark Government Portfolio (or such other Phantom Mutual Fund Subaccount as
may be designated by the Board of Directors).

                                   ARTICLE IV

                               PAYMENT OF ACCOUNT

         Upon the occurrence of a Director's Payment Commencement Event (as
defined below), on each Lump Sum Payment Date or Installment Payment Date (as
such terms are defined below) the Company shall debit the Director's Account and
pay to such Director (or in the event of the Director's death, to his or her
beneficiary) amounts at the times determined pursuant to this Article IV.



                                       3
<PAGE>   4

4.1      Payment Commencement Event.

         A Director's "Payment Commencement Event" shall be either (a) the
termination of the Director's service as a Director of the Company (or any
successor thereof), or (b) if, under the Plan as in effect before December 2,
1994, the Director elected a "Payment Commencement Event" of a specified age,
the date on which the Director attains such age.

4.2      Cash Lump Sum.

         Except as provided in Section 4.3, upon the occurrence of a Director's
Payment Commencement Event, there shall be paid to the Director in a cash lump
sum on the fifteenth day of the calendar quarter following the Payment
Commencement Event (or, if such day is not a business day, on the next business
day thereafter) (the "Lump Sum Payment Date") (or as soon as practicable
thereafter) an amount equal to the value of the Director's Account, as
determined below. For purposes of determining the value of a Director's Account
pursuant to this Section 4.2, (a) each of the Director's Phantom Mutual Fund
Subaccounts shall have a value equal to the product of (1) the closing price of
a share of such mutual fund on the last business day of the calendar quarter in
which the Payment Commencement Event occurs ("Lump Sum Valuation Date") and (2)
the number of phantom shares credited to such Subaccount on the Lump Sum
Valuation Date, and (b) the Director's Phantom Stock Subaccount shall have a
value equal to the product of (1) the average of the closing prices of a Unit on
the ten business days ending on the Lump Sum Valuation Date and (2) the number
of phantom Units credited to such Subaccount on the Lump Sum Valuation Date.

4.3      Installment Payments.

         (a)  Installment Payments Commenced On or After July 1, 1997. A
Director may elect to have all or (subject to any limitations imposed by the
Company) any designated portion of his or her Account paid in a number of annual
installments (up to a maximum of 15 installment payments) designated by the
Director. To be effective, such election must be written, irrevocable, and filed
with the Company at least twelve months before the Director's Payment
Commencement Event. Payment shall be made in the designated number of
installments as set forth below (the date of each payment being an "Installment
Payment Date"). The first installment shall be paid on the fifteenth day of the
calendar quarter following the Director's Payment Commencement Event (or if such
day is not a business day, on the next business day thereafter) or as soon as
practicable thereafter. Each subsequent installment shall be paid on an
Installment Payment Date that is the anniversary of the fifteenth day of such
calendar quarter (or if such day is not a business day, on the next business day
thereafter). Each installment shall be in an amount equal to (a) the value of
the Director's Account at the time of payment of such installment, as determined
below, divided by (b) the number of installments remaining to be paid (including
the installment about to be paid), and shall be made on a pro rata basis from
the Director's Subaccounts. For purposes of determining the value of an
installment 



                                       4
<PAGE>   5

of a Director's Account pursuant to this Section 4.3(a), (a) each of the
Director's Phantom Mutual Fund Subaccounts shall have a value equal to the
product of (1) the closing price of a share of such mutual fund on the last
business day of the calendar quarter immediately preceding the Installment
Payment Date (the "Installment Valuation Date") and (2) the number of phantom
shares credited to such Subaccount on the Installment Valuation Date, and (b)
the Director's Phantom Stock Subaccount shall have a value equal to the product
of (1) the average of the closing prices of a Unit on the ten business days
ending on the Installment Valuation Date and (2) the number of phantom Units
credited to such Subaccount on the Installment Valuation Date.

         (b)  Installment Payment Commenced Before July 1, 1997. If a
Director received his or her first installment payment under this Plan before
July 1, 1997, the date of each installment payment, and the value of each such
payment, shall be determined pursuant to the terms of the Plan as in effect on
December 31, 1996.

4.4      Disability.

         In the event a Director becomes disabled, the payment date and/or
payment schedule with respect to the balance in the Director's Account may be
accelerated by the Plan Committee (as defined in Section 6.1) in its sole
discretion.

4.5      Death.

         A Director shall be entitled to designate a beneficiary (and to change
such beneficiary from time to time) for payment of the balance of the Director's
Account in the event that a balance exists therein at the Director's date of
death. Upon a Director's death, any balance in the Director's Account shall be
paid to the deceased Director's beneficiary pursuant to the payment schedule
previously elected by the Director as provided in Sections 4.2 and 4.3. If no
beneficiary has been designated, the Director's estate shall be deemed the
beneficiary.

4.6      Change of Control.

         (a)  Before Termination of Service. Notwithstanding any other
election made by a Director pursuant to this Article IV, in the event that a
Director terminates service as a Director of the Company within three years
following a "Change of Control" (as defined in Section 6.9), the Payment
Commencement Event shall be the date of the termination of the Director's
service as a Director, and payment of the Director's Account shall be made in a
cash lump sum as soon as practicable (and within 30 days) after such Payment
Commencement Event. The amount of such lump-sum payment shall equal the value of
the Director's Account, as determined below. For purposes of determining the
value of a Director's Account pursuant to this Section 4.6(a), (a) the
Director's Phantom Mutual Fund Subaccounts shall have a value equal to the
product of (i) the closing price of a share of such mutual fund on the date of
the Payment Commencement Event (or, if the Payment Commencement Event does not
occur on a business day, on the next 



                                       5
<PAGE>   6

succeeding business day) and (2) the number of phantom shares credited to such
Subaccount on the date of the Payment Commencement Event (or the following
business day, if applicable), and (b) the Director's Phantom Stock Subaccount
shall have a value equal to the product of (1) the average of the closing prices
of a Unit on the ten business days ending on the date of the Payment
Commencement Event (or, if the Payment Commencement Event does not occur on a
business day, on the next succeeding business day), and (2) the number of
phantom Units credited to such Subaccount on the date of the Payment
Commencement Event (or the following business day, if applicable).

         (b)  After Payment Commencement Event. Notwithstanding any other
election made by a Director pursuant to this Article IV, in the event a "Change
of Control" (as defined in Section 6.9) occurs after a Director's Payment
Commencement Event, payment of the Director's Account shall be made in a cash
lump sum as soon as practicable (and within 30 days) after such Change of
Control. The amount of such lump-sum payment shall equal the value of the
Director's Account, as determined below. For purposes of determining the value
of a Director's Account pursuant to this Section 4.6(b), (a) the Director's
Phantom Mutual Fund Subaccounts shall have a value equal to the product of (1)
the closing price of a share of such mutual fund on the date of the Change of
Control (or, if the Change of Control does not occur on a business day, on the
next succeeding business day) and (2) the number of phantom shares credited to
such Subaccount on the date of the Change of Control (or the following business
day, if applicable), and (b) the Director's Phantom Stock Subaccount shall have
a value equal to the product of (1) the average of the closing prices of a Unit
on the ten business days ending on the date of the Change of Control (or, if the
Change of Control does not occur on a business day, on the next succeeding
business day), and (2) the number of phantom Units credited to such Subaccount
on the date of the Change of Control (or the following business day, if
applicable).

                                    ARTICLE V

                              UNFUNDED ARRANGEMENT

5.1      Unfunded Arrangement.

         Neither this Plan nor a Director's Account shall be funded. Rather, a
Director's Account and all entries thereto shall constitute bookkeeping records
only and shall not relate to any specific funds of the Company. Payments due
with respect to balances in a Director's Account shall be made from the general
assets of the Company.



                                       6
<PAGE>   7

                                   ARTICLE VI

                                 ADMINISTRATION

6.1      Plan Committee.

         The Plan shall be administered by a Plan Committee. The Plan Committee
shall be the Committee on Directors of the Board of Directors of the Company or
such other Committee as may be established by the Board of Directors of the
Company and may include Directors who have elected to participate in the Plan.
No member of the Plan Committee shall be liable for any act done or
determination made in good faith.

6.2      Committee Determinations Final.

         The construction and interpretation of any provision of the Plan by the
Plan Committee, and a determination by the Plan Committee of the amount of any
Director's Account, shall be final and conclusive.

6.3      Amendments.

         The Company, subject to approval of the Board of Directors, reserves
the right to terminate, modify or amend this Plan at any time; provided,
however, that the Plan shall not be subject to termination, modification or
amendment with respect to any balance of a Director's Account and rights
therein, including the right to future increments pursuant to Section 3.3,
unless the affected Director consents in writing.

6.4      Non-Alienation.

         No Director (or estate of a Director) shall have power to transfer,
assign, anticipate, mortgage or otherwise encumber any rights or any amounts
payable hereunder; nor shall any such rights or payments be subject to seizure
for the payment of any debts, judgments, alimony, or separate maintenance, or be
transferable by operation of law in the event of bankruptcy, insolvency, or
otherwise.

6.5      Expenses.

         The expenses of administering the Plan shall be borne by the Company
and shall not be charged against any Director's Account.

6.6      Withholding.

         The Company shall have the right to deduct from all payments any taxes
required to be withheld with respect to such payments.

6.7      Effect of IRS Determination.

         If any amounts deferred pursuant to the Plan are found in a
"determination" (within the meaning of Section 1313(a) of the Internal Revenue
Code of 1986, as amended) to have been includable in gross income by a Director
before payment of such 



                                       7
<PAGE>   8

amounts from the Director's Account, such amounts shall be immediately paid to
such Director, notwithstanding the Director's elections pursuant to Article IV.

6.8      Effect on Other Plans.

         All amounts which are credited to a Director's Account pursuant to
Section 3.1 (but not Sections 3.2 and 3.3) shall, solely for purposes of
calculating benefits under the Sonat Inc. Retirement Plan for Directors, be
deemed to have been paid to the Director on the date such amounts would have
been paid absent a Deferral Election under Article II of the Plan.

6.9      Change of Control.

         A "Change of Control" shall mean:

           (i) The acquisition by any individual, entity or group (within the
               meaning of Section 13(d)(3) or 14(d)(2) of the Securities
               Exchange Act of 1934 (the "Exchange Act")) (a "Person") of
               beneficial ownership (within the meaning of Rule 13d-3
               promulgated under the Exchange Act) of 20% or more of either (1)
               the then outstanding shares of common stock of the Company (the
               "Outstanding Common Stock") or (2) the combined voting power of
               the then outstanding voting securities of the Company entitled to
               vote generally in the election of directors (the "Outstanding
               Voting Securities"); provided, however, that for purposes of this
               subsection (i), the following acquisitions shall not constitute a
               Change of Control: (A) any acquisition directly from the Company,
               (B) any acquisition by the Company, (C) any acquisition by any
               employee benefit plan (or related trust) sponsored or maintained
               by the Company or any corporation controlled by the Company or
               (D) any acquisition by any corporation pursuant to a transaction
               which complies with clauses (A), (B) and (C) of subsection (iii);
               or 

          (ii) Individuals who, as of December 1, 1995, constitute the Board of
               Directors (the "Incumbent Board") cease for any reason to
               constitute at least a majority of the Board of Directors;
               provided, however, that any individual becoming a Director
               subsequent to such date whose election, or nomination for
               election by the Company's shareholders, was approved by a vote of
               at least a majority of the Directors then comprising the
               Incumbent Board shall be considered as though such individual
               were a member of the Incumbent Board, but excluding, for this
               purpose, any such individual whose initial assumption of office
               occurs as a result of an actual or threatened election contest
               with respect to the election or removal of Directors or other
               actual or threatened solicitation of proxies or consents by or on
               behalf of a Person other than the Board of Directors; or 

         (iii) Consummation of a reorganization, merger or consolidation or
               sale or other disposition of all or substantially all of the
               assets of the Company (a "Business Combination"), in each case,
               unless, following such Business 



                                       8
<PAGE>   9
               Combination, (A) all or substantially all of the individuals and
               entities who were the beneficial owners, respectively, of the
               Outstanding Common Stock and Outstanding Voting Securities
               immediately prior to such Business Combination beneficially own,
               directly or indirectly, more than 50% of, respectively, the then
               outstanding shares of common stock and the combined voting power
               of the then outstanding voting securities entitled to vote
               generally in the election of Directors, as the case may be, of
               the corporation resulting from such Business Combination
               (including, without limitation, a corporation which as a result
               of such transaction owns the Company or all or substantially all
               of the Company's assets either directly or through one or more
               subsidiaries) in substantially the same proportions as their
               ownership, immediately prior to such Business Combination, of the
               Outstanding Common Stock and Outstanding Voting Securities, as
               the case may be, (B) no Person (excluding any corporation
               resulting from such Business Combination or any employee benefit
               plan (or related trust) of the Company or such corporation
               resulting from such Business Combination) beneficially owns,
               directly or indirectly, 20% or more of, respectively, the then
               outstanding shares of common stock of the corporation resulting
               from such Business Combination or the combined voting power of
               the then outstanding voting securities of such corporation except
               to the extent that such ownership existed prior to the Business
               Combination and (C) at least a majority of the members of the
               board of directors of the corporation resulting from such
               Business Combination were members of the Incumbent Board at the
               time of the execution of the initial agreement, or of the action
               of the Board of Directors, providing for such Business
               Combination.

6.10     Payment Commencement Events Before December 2, 1994.

         Any Plan provision to the contrary notwithstanding, the Account of a
Director who has a Payment Commencement Event on or before December 1, 1994,
shall be credited, debited and paid out in accordance with the provisions of the
Plan as in effect on such date.

         IN WITNESS WHEREOF, Sonat Inc. has caused this document to be executed
as of December 6, 1996, to be effective as of January 1, 1997.

                                   SONAT INC.

                                   By 
                                     ------------------------------------
                                     Chairman of the Board, President and
                                     Chief Executive Officer


                                       9

<PAGE>   1
                                                                   EXHIBIT 10.11

                               INDEMNITY AGREEMENT

      AGREEMENT, dated as of January 30, 1998, by and between Sonat Inc. (the
"Company") and the undersigned director of the Company (the "Director").

      The Company's Certificate of Incorporation provides that the Company shall
indemnify the Directors to the full extent permitted by the laws of the State of
Delaware as from time to time in effect. Section 145 of the General Corporation
Law of Delaware (relating to the indemnification of officers, directors,
employees and agents) provides that the indemnification afforded by that section
shall not be deemed exclusive of any other rights to which those seeking
indemnification may be entitled under any by-law, agreement, vote of
stockholders or disinterested directors or otherwise. Section 145 also expressly
empowers the Company to purchase and maintain insurance on behalf of the
Director.

      In exercising the discretion with respect to indemnification given it by
the Company's Certificate of Incorporation, the Board of Directors of the
Company has considered the following, among other factors:

            (a) It is essential to the Company to attract and retain as
      directors the most capable persons available.

            (b) The substantial increase in corporate litigation that may
      subject directors to litigation costs and risks and the recent limitations
      on the availability of director's liability insurance have made and will
      make it increasingly difficult for the Company to attract and retain such
      persons.

            (c) When obtainable, insurance policies relating to indemnification
      are often subject to retentions by the insured, co-insurance requirements,
      exclusions and other limitations on coverage. 



<PAGE>   2
                                       2.


      In view of the foregoing and the fact that the Director is rendering
valuable services to the Company and desires to continue to provide such
services provided he receives assurance that the Company will indemnify him to
the full extent permitted by its Certificate of Incorporation, the Board of
Directors has determined to provide such assurance.

      In consideration of the Director's continued service to the Company, the
Company hereby agrees with the Director as follows:

      Section 1. General Right to Indemnification. Notwithstanding any other
provision of this Agreement except for Section 8, the Company shall indemnify
the Director to the full extent permitted by the laws of the State of Delaware
as from time to time in effect. Without limiting the generality of the
foregoing, the Company shall indemnify the Director in accordance with the
provisions set forth below.

      Section 2. Actions, Suits or Proceedings Other Than by or in the Right of
the Company. The Company shall indemnify the Director in the event that he was
or is a party or is threatened to be made a party to, or otherwise requires
representation by counsel in connection with, any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the Company) by reason
of the fact that he is or was or has agreed to become a director, officer,
employee or agent of the Company, or is or was serving or has agreed to serve as
a director, officer, employee or agent of any corporation, partnership, joint
venture or other entity of which the Company owns 50% or more of the voting or
equity interest (an "Affiliate") or any employee benefit plan of the Company or
an Affiliate, or by reason of any action alleged



<PAGE>   3
                                       3.


to have been taken or omitted in such capacity, against costs, charges, expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him or on his behalf in connection with such
action, suit or proceeding and any appeal therefrom, if he acted in good faith
and in a manner he reasonably believed to be in or not opposed to the best
interests of the Company, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful. The
termination of any action, suit or proceeding by judgment, order, settlement,
conviction, or upon a plea of nolo contendere or its equivalent, shall not, of
itself, create a presumption that the Director did not act in good faith and in
a manner which he reasonably believed to be in or not opposed to the best
interests of the Company, and, with respect to any criminal action or
proceeding, had reasonable cause to believe that his conduct was unlawful.

      Section 3. Actions or Suits by or in the Right of the Company. The Company
shall indemnify the Director in the event that he was or is a party or is
threatened to be made a party to, or otherwise requires representation by
counsel in connection with, any threatened, pending or completed action or suit
by or in the right of the Company to procure a judgment in its favor by reason
of the fact that he is or was or has agreed to become a director, officer,
employee or agent of the Company, or is or was serving or has agreed to serve as
a director, officer, employee or agent of any Affiliate or any employee benefit
plan of the Company or an Affiliate, or by reason of any action alleged to have
been taken or omitted in such capacity, against costs, charges and expenses
(including attorneys' fees) actually and reasonably incurred by him or on his
behalf in connection with the defense or settlement of 



<PAGE>   4
                                       4.


such action or suit and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed to be in or not opposed to the best interests of
the Company except that no indemnification shall be made in respect of any
claim, issue or matter as to which such Director shall have been adjudged to be
liable to the Company unless and only to the extent that the Court of Chancery
of Delaware or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of such liability but
in view of all the circumstances of the case, such Director is fairly and
reasonably entitled to indemnity for such costs, charges and expenses which the
Court of Chancery or such other court shall deem proper.

      Section 4. Indemnification for Costs, Charges and Expenses of Successful
Party. Notwithstanding the other provisions of this Agreement, to the extent
that the Director has been successful on the merits or otherwise, including,
without limitation, the dismissal of an action without prejudice, in defense of
any action, suit or proceeding covered by this Agreement, or in defense of any
claim, issue or matter therein, he shall be indemnified against all costs,
charges and expenses (including attorneys' fees) actually and reasonably
incurred by him or on his behalf in connection therewith.

      Section 5. Adverse Finding. Any indemnification under Sections 2 and 3 of
this Agreement (unless ordered by a court) shall be paid by the Company, in
accordance with the procedures set forth in Section 7 of this Agreement, unless
a determination is made within the 90-day period set forth in Section 7 (A) by
the Board of Directors by a majority vote of a quorum consisting of directors
who were not parties to such action, suit or 



<PAGE>   5
                                       5.


proceeding, or (B) if such a quorum is not obtainable, or, even if obtainable a
quorum of disinterested directors so directs, by independent legal counsel in a
written opinion, or (C) by the stockholders, that indemnification of the
Director is not proper in the circumstances because he has not met the
applicable standard of conduct set forth in Sections 2 and 3 of this Agreement.

      Section 6. Advances. Costs, charges, expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement incurred by the Director covered
by Sections 1 and 2 of this Agreement in defending any pending, threatened or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, and costs, charges and expenses (including attorneys' fees)
incurred by the Director covered by Section 3 of this Agreement in defending an
action by or in the right of the Company shall be paid by the Company in advance
of the determination of the Director's entitlement to indemnification promptly
upon receipt by the Company of evidence of the Director's obligation to pay such
costs, charges, expenses, judgments, fines or amounts paid in settlement (as the
case may be); provided, however, that such payment shall be made in advance of
the determination of the Director's entitlement to indemnification only with the
undertaking of the Director (which the Director hereby gives) that the Director
shall repay all amounts so advanced in the event that it shall ultimately be
determined that the Director is not entitled to be indemnified by the Company as
authorized in this Agreement. The Board of Directors may, upon approval of the
Director, authorize the Company's counsel to 



<PAGE>   6
                                       6.


represent the Director, in any action, suit or proceeding, whether or not the
Company is a party to such action, suit or proceeding.

      Section 7. Procedure for Indemnification. After the final disposition of
any action, suit or proceeding covered by this Agreement, the Director shall
send to the Company a written request for any indemnification sought under this
Agreement. No later than 90 days following receipt by the Company of such
request, the Company shall cause the indemnification provided hereunder to be
authorized and paid, unless during such 90-day period, with respect to
indemnification under Section 1 of this Agreement, a finding by the Company that
the indemnification requested is not permitted by the laws of the State of
Delaware then in effect is made and with respect to indemnification under
Section 2 or 3 of this Agreement, the adverse finding described in Section 5 of
this Agreement is made pursuant to such Section. The burden of proving that such
standard has not been met shall be on the Company. The Director shall be given
an opportunity to be heard and to present evidence on his behalf in connection
with consideration by the Board of Directors, independent legal counsel, or the
stockholders, as the case may be, of any findings required by applicable law. If
the Company (A) does not pay the indemnification requested by the Director
within 90 days after the receipt of such request, or (B) does not pay promptly
an advance in accordance with Section 6, the Director's right to indemnification
or to any advance and the Company's right to the repayment of any advance shall
be enforceable in any court of competent jurisdiction. In any such action,
neither the failure of the Company (including its Board of Directors, its
independent legal counsel, and its stockholders) to have 



<PAGE>   7
                                       7.


made a determination prior to the commencement of such action that
indemnification of the Director is proper in the circumstances because he has
met the applicable standard of conduct set forth in Section 2 or 3 of this
Agreement, nor the fact that the Company has made an adverse finding pursuant to
Section 5 of this Agreement, shall be a defense to the action or create a
presumption that the Director has not met the applicable standard of conduct.
However, it shall be a defense to the action (other than an action brought to
enforce a claim for an advance) if it is established that the Director has not
met the applicable standard of conduct set forth in Section 2 or 3 of this
Agreement. The Director's costs and expenses (including attorneys' fees)
incurred in connection with successfully establishing his right to
indemnification (including his right to indemnification in the event he shall
have been adjudged to be liable to the Company under Section 3 of this
Agreement) or any advance, in whole or in part, in any such action shall also be
indemnified by the Company. Any action instituted by the Company or by the
Director under this Agreement may be maintained as to the Company and the
Director in any court of competent jurisdiction, including but not limited to
the courts of the State of Delaware. The Company and the Director each consents
to the exercise of jurisdiction over it or him, as the case may be, by the Court
of Chancery of Delaware.

      Section 8. Voluntary Proceedings. The Company shall not indemnify the
Director or pay any advance to the Director in connection with any threatened,
pending or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative, voluntarily commenced by such Director against
the Company, any affiliate or any other director, 



<PAGE>   8
                                       8.


officer, employee or agent of the Company or any Affiliate or any employee
benefit plan of the Company or an Affiliate unless the institution of such
action, suit or proceeding was authorized prior to its commencement by a
majority vote of the Board of Directors or the Director is successful on the
merits in such action, suit or proceeding.

      Section 9.  Notice to Company. The Director must provide prompt written
notice to the Company of any pending or threatened action, suit or proceeding in
connection with which the Director may assert a right to be indemnified
hereunder; however, failure to provide such notice shall not be construed as a
waiver of any right to an advance or indemnification hereunder.

      Section 10. Other Rights; Continuation of Right to Indemnification. The
indemnification and advances provided by this Agreement shall not be deemed
exclusive of any other rights to which a Director seeking indemnification may be
entitled under any law (common or statutory), provision of the Company's
Certificate of Incorporation or By-Laws, vote of stockholders or disinterested
directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding office or while employed by or acting
as agent for the Company, and shall continue as to a person who has ceased to be
a Director, and shall inure to the benefit of the estate, heirs, executors and
administrators of the Director.

      Section 11. Amendments. This Agreement may not be amended without the
agreement in writing of the Company and the Director.

      Section 12. Savings Clause. If this Agreement or any portion hereof shall
be deemed invalid, illegal or unenforceable in any respect, the validity,
legality and 



<PAGE>   9
                                       9.


enforceability of the remaining provisions contained herein shall not in any way
be affected or impaired thereby, and the Company shall nevertheless indemnify
the Director as to costs, charges and expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement with respect to any action, suit
or proceeding, whether civil, criminal, administrative or investigative,
including an action by or in the right of the Company, to the full extent
permitted by any applicable portion of this Agreement that shall not have been
invalidated and to the full extent permitted by applicable law.

      Section 13. Survival Clause. The Company acknowledges that in continuing
to provide services to the Company, the Director is relying on this Agreement.
Accordingly, the Company agrees that its obligations hereunder will survive (a)
any actual or purported termination of this Agreement by the Company or its
successors or assigns whether by operation of law or otherwise, and (b)
termination of the Director's services to the Company, whether such services
were terminated by the Company or the Director, with respect to any claim,
action, suit or proceeding covered by Section 1, 2 or 3 hereof, whether or not
such claim is made or action, suit or proceeding is threatened or commenced
before or after the actual or purported termination of this Agreement or the
termination of the Director's services to the Company.

      Section 14. Successors and Assigns. This Agreement shall be binding on the
successors and assigns of the Company whether by operation of law or otherwise
and shall inure to the benefit of the estate, heirs and personal representatives
of the Director.



<PAGE>   10
                                      10.


      Section 15. Governing Law. This Agreement shall be governed in all
respects, including validity, interpretation and effect, by the laws of the
State of Delaware (without giving effect to the provisions thereof relating to
conflicts of law).

      IN WITNESS WHEREOF, this Agreement has been executed by the parties
thereto, in the case of the Company, by a duly authorized officer thereof on its
behalf.

                                   SONAT INC.

                                   By
                                     -------------------------------------------
                                     Ronald L. Kuehn, Jr.
                                     Chairman of the Board,
                                     President and
                                     Chief Executive Officer




                                     -------------------------------------------
                                     Selim K. Zilkha

      Signature page of Indemnity Agreement dated as of January 30, 1998,
between Sonat Inc. and above named Director.



<PAGE>   11

                               INDEMNITY AGREEMENT

      AGREEMENT, dated as of January 30, 1998, by and between Sonat Inc. (the
"Company") and the undersigned director of the Company (the "Director").

      The Company's Certificate of Incorporation provides that the Company shall
indemnify the Directors to the full extent permitted by the laws of the State of
Delaware as from time to time in effect. Section 145 of the General Corporation
Law of Delaware (relating to the indemnification of officers, directors,
employees and agents) provides that the indemnification afforded by that section
shall not be deemed exclusive of any other rights to which those seeking
indemnification may be entitled under any by-law, agreement, vote of
stockholders or disinterested directors or otherwise. Section 145 also expressly
empowers the Company to purchase and maintain insurance on behalf of the
Director.

      In exercising the discretion with respect to indemnification given it by
the Company's Certificate of Incorporation, the Board of Directors of the
Company has considered the following, among other factors:

            (a) It is essential to the Company to attract and retain as
      directors the most capable persons available.

            (b) The substantial increase in corporate litigation that may
      subject directors to litigation costs and risks and the recent limitations
      on the availability of director's liability insurance have made and will
      make it increasingly difficult for the Company to attract and retain such
      persons.

            (c) When obtainable, insurance policies relating to indemnification
      are often subject to retentions by the insured, co-insurance requirements,
      exclusions and other limitations on coverage. 



<PAGE>   12
                                       2.


      In view of the foregoing and the fact that the Director is rendering
valuable services to the Company and desires to continue to provide such
services provided he receives assurance that the Company will indemnify him to
the full extent permitted by its Certificate of Incorporation, the Board of
Directors has determined to provide such assurance.

      In consideration of the Director's continued service to the Company, the
Company hereby agrees with the Director as follows:

      Section 1. General Right to Indemnification. Notwithstanding any other
provision of this Agreement except for Section 8, the Company shall indemnify
the Director to the full extent permitted by the laws of the State of Delaware
as from time to time in effect. Without limiting the generality of the
foregoing, the Company shall indemnify the Director in accordance with the
provisions set forth below.

      Section 2. Actions, Suits or Proceedings Other Than by or in the Right of
the Company. The Company shall indemnify the Director in the event that he was
or is a party or is threatened to be made a party to, or otherwise requires
representation by counsel in connection with, any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the Company) by reason
of the fact that he is or was or has agreed to become a director, officer,
employee or agent of the Company, or is or was serving or has agreed to serve as
a director, officer, employee or agent of any corporation, partnership, joint
venture or other entity of which the Company owns 50% or more of the voting or
equity interest (an "Affiliate") or any employee benefit plan of the Company or
an Affiliate, or by reason of any action alleged 



<PAGE>   13
                                       3.


to have been taken or omitted in such capacity, against costs, charges, expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him or on his behalf in connection with such
action, suit or proceeding and any appeal therefrom, if he acted in good faith
and in a manner he reasonably believed to be in or not opposed to the best
interests of the Company, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful. The
termination of any action, suit or proceeding by judgment, order, settlement,
conviction, or upon a plea of nolo contendere or its equivalent, shall not, of
itself, create a presumption that the Director did not act in good faith and in
a manner which he reasonably believed to be in or not opposed to the best
interests of the Company, and, with respect to any criminal action or
proceeding, had reasonable cause to believe that his conduct was unlawful.

      Section 3. Actions or Suits by or in the Right of the Company. The Company
shall indemnify the Director in the event that he was or is a party or is
threatened to be made a party to, or otherwise requires representation by
counsel in connection with, any threatened, pending or completed action or suit
by or in the right of the Company to procure a judgment in its favor by reason
of the fact that he is or was or has agreed to become a director, officer,
employee or agent of the Company, or is or was serving or has agreed to serve as
a director, officer, employee or agent of any Affiliate or any employee benefit
plan of the Company or an Affiliate, or by reason of any action alleged to have
been taken or omitted in such capacity, against costs, charges and expenses
(including attorneys' fees) actually and reasonably incurred by him or on his
behalf in connection with the defense or settlement of 



<PAGE>   14
                                       4.


such action or suit and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed to be in or not opposed to the best interests of
the Company except that no indemnification shall be made in respect of any
claim, issue or matter as to which such Director shall have been adjudged to be
liable to the Company unless and only to the extent that the Court of Chancery
of Delaware or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of such liability but
in view of all the circumstances of the case, such Director is fairly and
reasonably entitled to indemnity for such costs, charges and expenses which the
Court of Chancery or such other court shall deem proper.

      Section 4. Indemnification for Costs, Charges and Expenses of Successful
Party. Notwithstanding the other provisions of this Agreement, to the extent
that the Director has been successful on the merits or otherwise, including,
without limitation, the dismissal of an action without prejudice, in defense of
any action, suit or proceeding covered by this Agreement, or in defense of any
claim, issue or matter therein, he shall be indemnified against all costs,
charges and expenses (including attorneys' fees) actually and reasonably
incurred by him or on his behalf in connection therewith.

      Section 5. Adverse Finding. Any indemnification under Sections 2 and 3 of
this Agreement (unless ordered by a court) shall be paid by the Company, in
accordance with the procedures set forth in Section 7 of this Agreement, unless
a determination is made within the 90-day period set forth in Section 7 (A) by
the Board of Directors by a majority vote of a quorum consisting of directors
who were not parties to such action, suit or



<PAGE>   15
                                       5.


proceeding, or (B) if such a quorum is not obtainable, or, even if obtainable a
quorum of disinterested directors so directs, by independent legal counsel in a
written opinion, or (C) by the stockholders, that indemnification of the
Director is not proper in the circumstances because he has not met the
applicable standard of conduct set forth in Sections 2 and 3 of this Agreement.

      Section 6. Advances. Costs, charges, expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement incurred by the Director covered
by Sections 1 and 2 of this Agreement in defending any pending, threatened or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, and costs, charges and expenses (including attorneys' fees)
incurred by the Director covered by Section 3 of this Agreement in defending an
action by or in the right of the Company shall be paid by the Company in advance
of the determination of the Director's entitlement to indemnification promptly
upon receipt by the Company of evidence of the Director's obligation to pay such
costs, charges, expenses, judgments, fines or amounts paid in settlement (as the
case may be); provided, however, that such payment shall be made in advance of
the determination of the Director's entitlement to indemnification only with the
undertaking of the Director (which the Director hereby gives) that the Director
shall repay all amounts so advanced in the event that it shall ultimately be
determined that the Director is not entitled to be indemnified by the Company as
authorized in this Agreement. The Board of Directors may, upon approval of the
Director, authorize the Company's counsel to 



<PAGE>   16
                                       6.


represent the Director, in any action, suit or proceeding, whether or not the
Company is a party to such action, suit or proceeding.

      Section 7. Procedure for Indemnification. After the final disposition of
any action, suit or proceeding covered by this Agreement, the Director shall
send to the Company a written request for any indemnification sought under this
Agreement. No later than 90 days following receipt by the Company of such
request, the Company shall cause the indemnification provided hereunder to be
authorized and paid, unless during such 90-day period, with respect to
indemnification under Section 1 of this Agreement, a finding by the Company that
the indemnification requested is not permitted by the laws of the State of
Delaware then in effect is made and with respect to indemnification under
Section 2 or 3 of this Agreement, the adverse finding described in Section 5 of
this Agreement is made pursuant to such Section. The burden of proving that such
standard has not been met shall be on the Company. The Director shall be given
an opportunity to be heard and to present evidence on his behalf in connection
with consideration by the Board of Directors, independent legal counsel, or the
stockholders, as the case may be, of any findings required by applicable law. If
the Company (A) does not pay the indemnification requested by the Director
within 90 days after the receipt of such request, or (B) does not pay promptly
an advance in accordance with Section 6, the Director's right to indemnification
or to any advance and the Company's right to the repayment of any advance shall
be enforceable in any court of competent jurisdiction. In any such action,
neither the failure of the Company (including its Board of Directors, its
independent legal counsel, and its stockholders) to have 



<PAGE>   17
                                       7.


made a determination prior to the commencement of such action that
indemnification of the Director is proper in the circumstances because he has
met the applicable standard of conduct set forth in Section 2 or 3 of this
Agreement, nor the fact that the Company has made an adverse finding pursuant to
Section 5 of this Agreement, shall be a defense to the action or create a
presumption that the Director has not met the applicable standard of conduct.
However, it shall be a defense to the action (other than an action brought to
enforce a claim for an advance) if it is established that the Director has not
met the applicable standard of conduct set forth in Section 2 or 3 of this
Agreement. The Director's costs and expenses (including attorneys' fees)
incurred in connection with successfully establishing his right to
indemnification (including his right to indemnification in the event he shall
have been adjudged to be liable to the Company under Section 3 of this
Agreement) or any advance, in whole or in part, in any such action shall also be
indemnified by the Company. Any action instituted by the Company or by the
Director under this Agreement may be maintained as to the Company and the
Director in any court of competent jurisdiction, including but not limited to
the courts of the State of Delaware. The Company and the Director each consents
to the exercise of jurisdiction over it or him, as the case may be, by the Court
of Chancery of Delaware.

      Section 8. Voluntary Proceedings. The Company shall not indemnify the
Director or pay any advance to the Director in connection with any threatened,
pending or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative, voluntarily commenced by such Director against
the Company, any affiliate or any other director, 



<PAGE>   18
                                       8.


officer, employee or agent of the Company or any Affiliate or any employee
benefit plan of the Company or an Affiliate unless the institution of such
action, suit or proceeding was authorized prior to its commencement by a
majority vote of the Board of Directors or the Director is successful on the
merits in such action, suit or proceeding.

      Section 9.  Notice to Company. The Director must provide prompt written
notice to the Company of any pending or threatened action, suit or proceeding in
connection with which the Director may assert a right to be indemnified
hereunder; however, failure to provide such notice shall not be construed as a
waiver of any right to an advance or indemnification hereunder.

      Section 10. Other Rights; Continuation of Right to Indemnification. The
indemnification and advances provided by this Agreement shall not be deemed
exclusive of any other rights to which a Director seeking indemnification may be
entitled under any law (common or statutory), provision of the Company's
Certificate of Incorporation or By-Laws, vote of stockholders or disinterested
directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding office or while employed by or acting
as agent for the Company, and shall continue as to a person who has ceased to be
a Director, and shall inure to the benefit of the estate, heirs, executors and
administrators of the Director.

      Section 11. Amendments. This Agreement may not be amended without the
agreement in writing of the Company and the Director.

      Section 12. Savings Clause. If this Agreement or any portion hereof shall
be deemed invalid, illegal or unenforceable in any respect, the validity,
legality and 



<PAGE>   19
                                       9.


enforceability of the remaining provisions contained herein shall not in any way
be affected or impaired thereby, and the Company shall nevertheless indemnify
the Director as to costs, charges and expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement with respect to any action, suit
or proceeding, whether civil, criminal, administrative or investigative,
including an action by or in the right of the Company, to the full extent
permitted by any applicable portion of this Agreement that shall not have been
invalidated and to the full extent permitted by applicable law.

      Section 13. Survival Clause. The Company acknowledges that in continuing
to provide services to the Company, the Director is relying on this Agreement.
Accordingly, the Company agrees that its obligations hereunder will survive (a)
any actual or purported termination of this Agreement by the Company or its
successors or assigns whether by operation of law or otherwise, and (b)
termination of the Director's services to the Company, whether such services
were terminated by the Company or the Director, with respect to any claim,
action, suit or proceeding covered by Section 1, 2 or 3 hereof, whether or not
such claim is made or action, suit or proceeding is threatened or commenced
before or after the actual or purported termination of this Agreement or the
termination of the Director's services to the Company.

      Section 14. Successors and Assigns. This Agreement shall be binding on the
successors and assigns of the Company whether by operation of law or otherwise
and shall inure to the benefit of the estate, heirs and personal representatives
of the Director.



<PAGE>   20
                                      10.


      Section 15. Governing Law. This Agreement shall be governed in all
respects, including validity, interpretation and effect, by the laws of the
State of Delaware (without giving effect to the provisions thereof relating to
conflicts of law).

      IN WITNESS WHEREOF, this Agreement has been executed by the parties
thereto, in the case of the Company, by a duly authorized officer thereof on its
behalf.

                                   SONAT INC.

                                   By
                                     -------------------------------------------
                                     Ronald L. Kuehn, Jr.
                                     Chairman of the Board,
                                     President and
                                     Chief Executive Officer



                                     -------------------------------------------
                                     Michael E. Zilkha


      Signature page of Indemnity Agreement dated as of January 30, 1998,
between Sonat Inc. and above named Director.

<PAGE>   1
                                                                   EXHIBIT 10.15


                            SCHEDULE OF PARTICIPANTS

                   SONAT INC. EXECUTIVE LIFE INSURANCE PROGRAM


         The following are participants in the Sonat Inc. Executive Life
Insurance Program, form of which is filed as Exhibit 10-(20) to the Sonat Inc.
Annual Report on Form 10-K for the year ended December 31,1 990:

                               Thomas W. Barker, Jr.
                               Richard B. Bates
                               Beverley T. Krannich
                               Ronald L. Kuehn, Jr.
                               James E. Moylan, Jr.
                               John M. Musgrave
                               James A. Rubright
                               Donald G. Russell
                               William A. Smith








<PAGE>   1



                                                                   EXHIBIT 10.16

                      SONAT INC. DEFERRED COMPENSATION PLAN
                                  PLAN SUMMARY

         The Sonat Inc. Deferred Compensation Plan ("the Plan") provides you
with a tax-advantaged opportunity to save for retirement and other future income
needs. You are encouraged to review the Plan with your family and your tax and
financial advisors to determine how the Plan can help you meet your personal
financial goals.

         The following is a summary of the Plan, in a Question-and-Answer
format. The official provisions of the Plan are in the Plan document, which you
may obtain from the Human Resources Department in Birmingham. If there is any
conflict or inconsistency between this summary or any other written or oral
communication and the Plan document, the official Plan document will always
govern. The Plan is subject to continued compliance with Internal Revenue
Service regulations.

HOW THE PLAN WORKS

1.       What is the Sonat Inc. Deferred Compensation Plan?
         - An Overview

         The Plan is a non-qualified deferred compensation program that allows
you to make pre-tax deferrals of base pay and bonuses, allocate the deferrals to
various investment options, and have your account balance paid to you in the
future.

         You will be able to elect, for each year, the amount of base pay and
bonus that you wish to defer. You may defer up to 25% of your base pay and up to
90% of your annual bonus. Your deferrals will accrue earnings as if held in
"phantom" investments in the investment options available under the Sonat
Savings Plan.

         Generally speaking, distribution will be made upon termination of your
employment. You may instead select a specified date on which to receive
payments, which may be before or after your anticipated retirement or
termination date. Payment will be made as a lump sum or in annual installments,
at your election.

2.       What are the advantages of the Deferred Compensation Plan?

A.       Reduced Current Income Taxes.

         Your current federal taxable income is reduced by the amount you elect
to defer. However, you will be taxed at the ordinary income rates in effect at
the time of distribution of your account. All state income tax laws (except in
Pennsylvania and New Jersey) follow the federal law and exclude the amount you
defer from current taxable income. Please consult with your personal tax advisor
regarding the laws for your particular state.


<PAGE>   2

B.       More Dollars Available for Investment.

         The initial deferral (investment) into this Plan can be a more
efficient investment than most other outside investments, because you are
investing pre-tax income rather than after-tax income. For example:

<TABLE>
<CAPTION>
                                          ===============================
                                              Outside 
                                           Investment           This Plan
           ==============================================================
           <S>                             <C>                 <C>  
           Compensation                         $1.00               $1.00
           Current Income Tax at 36%             -.36                -.00
           Net Funds Invested                   $ .64               $1.00
           ==============================================================
</TABLE>

C.       Tax-Deferred Accumulation.

         Earnings in your Plan account are not subject to federal income tax
until paid to you. As a result, investments in the Plan can generate higher
results than similar investments whose earnings are taxed each year.

D.       Possible Future Tax Savings.

         You may achieve additional income tax savings when you receive your
deferral account, if you are in a lower tax bracket at that time.

3.       What are the trade-offs if I participate?

A.       Reduced Current Cash Flow.

         By deferring your compensation, you reduce your current cash flow.
Therefore, if you require a greater amount of current income, deferral may not
be appropriate for you. However, the cash flow reduction may be significantly
less than the amount deferred, since your deferral is in pre-tax dollars. For
example, if your tax rate is 36%, $10,000 of compensation produces approximately
$6,400 of after-tax income. Therefore, deferring $10,000 reduces your disposable
after-tax income by $6,400, and you also have the equivalent of $10,000 working
for you in your deferral account.

B.       The Program Is Unfunded.

         Under current IRS regulations, your deferral account must be an
unsecured general obligation of Sonat Inc. and may not be funded in any way.
Therefore, your right to receive


                                       2
<PAGE>   3

payments under the Plan will be subject to Sonat Inc.'s ability to pay, and in
the event of Sonat's bankruptcy or insolvency will be the same as any other
unsecured general creditor. The Plan does not create a trust relationship
between you, or any other person, and the Company.

C.       Restricted Access To Your Money.

         You do not have access to your deferrals and earnings until the date
you specify on your election form, except in the limited circumstances discussed
at Question 15.

D.       Employment and Local Taxes.

         Amounts you defer under the Plan are subject to Social Security taxes
(up to the statutory limit), Medicare taxes and local (county and city) taxes
(if applicable). Withholding of these taxes on base pay deferral amounts will be
made from your remaining undeferred base pay. If you defer any of your bonus,
the taxes on your deferral will be withheld from the portion of the bonus that
is not deferred. (This is the reason the Plan does not allow complete deferral
of a bonus payout.) However, under current law, the payments from your accounts
will not be subject to Social Security, Medicare or local taxes at the time of
distribution.

E.       Possible Higher Tax Rate.

         The benefits of your deferral may be smaller than you would otherwise
expect if, at the time of distribution, you are in a higher tax bracket than
when you deferred.

4.       How does the Deferred Compensation Plan compare with the Sonat Savings
         Plan?

         Please refer to Exhibit A of this Summary.

5.       Does my participation affect my other Sonat benefits?

         Your participation in the Plan will have no effect on your other Sonat
benefits.

ELIGIBILITY

6.       Who is eligible to participate in the Deferred Compensation Plan?

         To be eligible to participate in the Plan, you must be an officer of
the Company or one of its principal subsidiaries, and must be selected for
participation by the Company's Chief Executive Officer.

DEFERRAL ELECTIONS

7.       What deferral elections can I make?



                                       3
<PAGE>   4



         Each year you will be able to elect to defer both base pay and bonus.
Each item of compensation (base pay and bonus) for each year will be treated as
a discrete election. With each deferral election, you will select how much you
wish to defer, how you wish it to be paid (lump sum or installments), and when
you wish to receive it in the future. You will also select how the deferred
amounts will be allocated among the investment choices under the Plan. All of
these elections are discussed in more detail below.

8.       When do I make my election to defer?

         An election to defer base pay must be made before the calendar year in
which the base pay is earned. The election to defer a bonus earned for a given
calendar year must be made by March 31 of that year.

         Special rules will apply for an officer who first becomes eligible to
participate in the Plan after January 1, 1997. Such an officer must make
deferral elections for the remainder of the year's base pay, and the bonus
earned for that year, during that year and within 31 days after becoming
eligible.

9.       How much can I defer?

         You may defer up to 25% of your annual base pay. Your deferral can be
for 1, 2, 3, 4 or 5% of base pay, or in 5% increments up to 25%. You may also
defer up to 90% of your annual bonus in 10% increments. An election to defer a
bonus will apply only to your annual bonus opportunity, and not to any special
bonus that you may receive.

         In certain circumstances, if you elect to defer 90% of an annual bonus,
the remaining 10% may not be enough to satisfy the applicable federal and state
income, Social Security, Medicare and local tax withholding obligations. If this
situation applies to you, the Company will automatically reduce the amount of
bonus deferred (generally to about 85%), and use the remainder to satisfy the
tax withholding obligations.

         Your election to defer is irrevocable, so you should carefully assess
the impact of your deferral elections on your personal financial situation.

10.      What are my investment options?

         Your deferral accounts will accrue earnings, according to your
election, as if held in the investment options available under the Sonat Savings
Plan - Sonat Stock Fund, Benchmark Government, PIMCO Total Return, Fidelity
Puritan, Benchmark Equity Index, MFS Research, Fidelity Magellan, T. Rowe Price
New Horizons, and T. Rowe Price International. Your allocations to these
investment choices must be in 1% increments. For more information, see the
Summary of Investment Options for the Plan.



                                       4
<PAGE>   5

         Please note that your deferrals will not actually be invested in these
funds, but will be valued as if they were. (This bookkeeping treatment is often
called a "phantom" investment.) Your account's value will change as the values
of the relevant funds change, including reinvestments of dividends and earnings.

11.      Can I change how future allocations will be invested, and move funds
         among the investment options?

         You may change the way future allocations are invested by selecting a
new allocation (in 1% increments, with a total of 100% among the investment
choices). You may also transfer your current balance among the investment
options by selecting (in 1% increments, with a total allocation of 100%) the
options in which you want your funds to be invested. Each procedure can be done
by phone on any business day, and will be effective on the day you make the
phone call.

         To process these transactions, you should call Mike Byrne in the
Company's Human Resources Department (205/325-7329).

12.      When will I receive my deferral account balance?

         Each time you make a deferral election, you will elect a payment event
upon which to receive the amount deferred (and earnings on that amount) -
termination of employment, or a specified future date. Each year and each
element of compensation (base pay or bonus) will be treated as a separate
election. Special Plan provisions apply in the event of your death, or in the
event of a change of control of the Company.

A.       Termination of Employment

         You may select termination of employment as the payment event. This
selection would cover termination due to early or normal retirement, disability,
discharge, or resignation. An election to receive a deferred amount (and
earnings) upon termination of employment will be irrevocable.

B.       Specified Date

         You may instead select a specified date on which to receive the amount
deferred (and earnings). Such a date must be a July 1, must be at least two
years after the deferral election is made, and must be no later than your 70th
birthday.

         If you select a payment event of a specified date you may, by making a
subsequent election at least 12 months before the specified date, elect to
postpone the date of payment. The new date must be a July 1, must be at least
two years after the date you first selected, and must be no later than your 70th
birthday. (You may not select termination of employment as your new payment
event.) You may postpone the specified payment date of a given deferral (and
earnings) only once. For example, if you elect to have a portion of your 1998
base pay (and earnings) paid on July 1, 2001, you could elect a later payment
date (on or after July 1, 2003) by filing an election before July 1, 2000.



                                       5
<PAGE>   6

C.       Death

         Upon your death, your entire balance in the Plan will be paid to your
beneficiary in a cash lump sum on the fifteenth day of the calendar quarter
following your death (or the first business day thereafter). For information
about beneficiary designations, see Question 14.

D.       Change of Control

         If your employment terminates within three years after a Change of
Control of the Company (as defined in the Plan), your entire balance in the Plan
will be paid to you in a cash lump sum as soon as practicable (and within 30
days) after your termination of employment. Also, if a Change of Control occurs
after termination of your employment, your entire balance in the Plan will be
paid to you in a cash lump sum as soon as practicable (and within 30 days) after
the Change of Control.

E.       Committee Discretion to Defer Payment

         Under current tax law, if you are an executive whose pay is disclosed
in the Company's proxy statement, and if the "non-performance based" pay you
receive in a year exceeds $1,000,000, the Company will not receive a tax
deduction for the excess non-performance based pay. In general, under the
Company's current compensation programs, the following elements of pay are
"non-performance based" when received: base pay; a portion of annual bonus; base
pay deferred from previous years (and earnings thereon); and a portion of annual
bonuses deferred from previous years (and earnings thereon).

         If the Executive Compensation Committee determines that your receipt of
a payment from the Plan could cause the Company to lose a tax deduction under
this law, the Committee can defer all or part of the payment to eliminate or
reduce loss of the tax deduction. Under current law, this issue can generally
arise only if you receive a payment before termination of employment.

13.      How will my account be paid out of the Plan?

         When you make a deferral election, you will elect how you wish to
receive the amount deferred (and earnings on that amount). As with the payment
event, each year and each element of compensation (base pay and bonus) will be
treated as a separate election. You may choose, in each case, a lump sum payment
or annual installments.

A.       Annual Installments

         You may elect to have payment made to you in 2-15 annual installments.
If you make an installment election, that election is irrevocable. If you elect
installment payments to begin on a



                                       6
<PAGE>   7

specified future date, the first payment will be made on the July 1 that you
selected (or, if that day is not a business day, on the next business day). If
you elect installment payments to begin upon termination of employment, the
first payment will be made on the fifteenth day of the following calendar
quarter (or if that day is not a business day, on the next business day). Each
subsequent payment will be made on the anniversary of the preceding payment.
Each installment will equal (1) the balance of the amount deferred (and
earnings) being paid out under the installment election at the time of payment,
divided by (2) the number of payments remaining to be paid (including the
current installment). For example, if you elect for a deferral (and earnings) to
be paid in three annual installments beginning July 1, 2005, the first payment
will equal 1/3 of the balance on July 1, 2005; the second installment will equal
1/2 of the balance on July 1, 2006; and the last installment will equal the
remaining balance on July 1, 2007.

B. Lump Sum

         If you make a lump sum election, payments will be made to you in that
form. If you elect a lump sum, you may later decide, by making an irrevocable
election at least 12 months before the payment event (that is, termination of
employment or a specified date, according to your election), to instead receive
the payment in 2-15 annual installments, as discussed above. Therefore, if you
are not sure whether you want installment payments at the time you make a
deferral election, you may wish to elect a lump sum, and consider making an
installment election later.

         If a lump sum payment is to be made on a specified future date, payment
will be made on the July 1 that you selected (or, if that day is not a business
day, on the next business day). If a lump sum payment is to be made after your
termination of employment, payment will be made on the fifteenth day of the
following calendar quarter (or, if that day is not a business day, on the next
business day).

C.       Account Valuation

         All investment options (except the Sonat Stock Fund investment) will be
valued at the close of the June 15 (or, if that day is not a business day, the
next business day) before the payment date (if payment is being made on a
specified future date), or on the last business day of the calendar quarter
before the payment date (if payment is being made upon termination of
employment). The Sonat Stock Fund investment will be valued based on the average
of the closing price of the Fund on the 10 business days ending on June 15 (or
next business day) or the last business day of the calendar quarter (as the case
may be). All installment payments will be made on a pro rata basis from your
investments at the time of payment. 

14.      How do I name my beneficiary?



                                       7
<PAGE>   8

         Upon your death, your beneficiary(ies) will be paid your entire Plan
balance. You may make or change a beneficiary designation at any time, by
filling out a Beneficiary Designation Form and filing it with the Company's
Human Resources Department. You may name one or more primary beneficiaries, as
well as one or more contingent beneficiaries (to receive your Plan balance if
all primary beneficiaries predecease you). If you make no beneficiary
designation, or if all designated beneficiaries predecease you, your Plan
balance will be paid to your estate.

ACCESS TO YOUR MONEY BEFORE THE PAYMENT EVENT

15.      Can I get money from my account before the date I elect for deferral
         payments to begin?

         Access to your Plan balance before the payment event that you select is
very limited. You may withdraw funds from your deferral account only in the
event of an extreme and unforeseen financial hardship.

A.       Financial Hardship Distributions

         In the event of unusual, extraordinary expenses or unforeseen financial
hardship, you may request a distribution of the amount reasonably necessary to
meet your financial need. This definition of hardship is more stringent than the
hardship provision in the Sonat Savings Plan, and does not, for instance,
include college expenses, or costs in connection with a home purchase. It
generally encompasses hardship generated by unforeseen circumstances, such as
unreimbursed medical expenses, family loss of income by layoff and the like. The
Executive Compensation Committee of the Board of Directors may approve or deny
the request in its sole discretion, and distribution is limited to the amount
necessary to relieve the hardship plus your income tax liability on the
distribution. If approved, this distribution is not subject to any penalty
taxes, and is ordinary income for federal and state income tax purposes.

B.       Loans

         Loans are not available from your account balance, since the Plan would
lose its favorable tax treatment if loans were permitted.

TAX CONSIDERATIONS

16.      What are some of the more common tax-related questions that should
         concern me?

Am I taxed on my deferrals or earnings credited to them?

         Under current tax law, neither your deferrals nor the earnings thereon
are subject to federal income tax before withdrawal from the Plan. All state
income laws (except in Pennsylvania and New Jersey) follow the federal law and
exclude the amount you defer from current taxable income. Under current law,
there will be no income tax liability until you actually receive a payment.
Check with your legal or tax counsel concerning your specific state or local
(city, county) tax laws.



                                       8
<PAGE>   9

What about Social Security, Medicare and Local taxes?

         Deferred amounts are subject to these taxes at the time of deferral.
The eventual payment of your deferral accounts, including earnings, will not be
subject to these taxes under current law. Distributions from the Plan will not
reduce your Social Security benefits after retirement, as they do not represent
wages for services performed in the calendar year of receipt.

How will payments be reported?

         Payments made to you will be reported on Form W-2, whether you are
employed or retired at time of distribution. Payments to beneficiaries made in
the event of your death will be reported on Form 1099.

Can I roll over my distribution to an IRA?

         No, because this is not a tax-qualified program under the Internal
Revenue Code. When electing a Plan distribution, you should seek professional
tax advice to determine the best course of action in light of your financial
circumstances. Will the Plan benefits paid to my beneficiaries be included in my
gross estate for federal estate tax purposes?


         Yes, the cumulative amounts in your account at the time of death will
be included in your estate. If, however, your spouse is your beneficiary and the
benefit qualifies for the estate tax marital deduction, the amount in your
account may not increase your taxable estate.

         You should consult with your legal and financial advisors about
beneficiary designations and the payment of benefits in the event of your death.

How will my distributions be taxed?

         Under current law, distributions from your account are taxed as
ordinary income when received, and no special tax advantages or penalties apply.
Federal and state income taxes will be withheld from your payments when they are
made.

ENROLLMENT

17.      How do I sign up for the Deferred Compensation Plan?

         You will be given enrollment materials a few weeks before a deferral
election is required under the Plan. You should review these materials carefully
with your family and financial advisors, and return all the necessary forms by
the dates described in the materials.



                                       9
<PAGE>   10

18.      Who can I talk to if I have questions about the Deferred Compensation
         Plan or the enrollment package?

         If you have general questions about the Plan or the enrollment
materials, call Mike Byrne (205/325-7329) or Al Delchamps (205/325-7676).

         You should call Mike Byrne (205/325-7329) for information about your
Plan accounts and the available investment options, to change the way future
allocations to your account are invested, to move funds among the investment
options, and for information regarding beneficiary designations.

OTHER INFORMATION

19.      What information will I receive about my Plan balance?

         You will receive a quarterly statement that will provide you with the
balance in your account, deferrals and investment earnings for the quarter, and
other information.

20.      What are the Section 16 consequences of participating in the Plan?

         You need to review this Question and Answer only if you are an
executive officer of Sonat Inc. who is subject to the provisions of Section 16
of the Securities Exchange Act. Section 16(b) requires executive officers to pay
over to the Company any profit realized from the purchase and sale, or sale and
purchase, of Company equity securities within any period of less than six
months. Section 16(a) requires reports of changes in beneficial ownership of
Sonat equity securities to the Securities and Exchange Commission. You will be
notified if you are subject to Section 16.

         The following will describe how transactions in the Plan are treated
for purposes of Sections 16(b) (short swing profit liability) and 16(a)
(reporting). When a transaction is said to be "exempt", it means the transaction
is not a "purchase" or a "sale" under Section 16(b). (As noted below, however,
many exempt transactions still trigger reporting requirements under Section
16(a).)

A.       Contributions; Investment of Earnings

         Acquisitions of units of the phantom Sonat Stock Fund through deferrals
and reinvestment of earnings under the Plan are exempt under Section 16(b).

B.       Transfers Among Investment Options; In-Service Cash Withdrawals and
         Payments; Savings Plan Loans

         Transfers among investment options under the Plan are called
"discretionary" transactions under the Section 16 rules. The Section 16
consequence of a discretionary transaction in the Plan is



                                       10
<PAGE>   11

affected by the discretionary transactions in any Sonat plan that involves stock
or phantom stock funds - the Sonat Savings Plan, the Savings Plan feature of the
Supplemental Benefit Plan, and the Deferred Compensation Plan. A discretionary
disposition of units of the Sonat Stock Fund or phantom Sonat Stock Fund in any
of these plans (such as a transfer into a mutual fund investment, or the
liquidation of stock to acquire loan proceeds or to fund a cash in-service
withdrawal from the Savings Plan) will be exempt unless you elected to make a
discretionary acquisition (such as transfer from a mutual fund (or phantom
mutual fund) into units of the Sonat Stock Fund (or phantom Sonat Stock Fund))
within the previous 6 months under any plan. Similarly, a discretionary
acquisition of units of the Sonat Stock Fund (or phantom Sonat Stock Fund) under
any plan (as described above) is exempt, unless you elected to make a
discretionary disposition of units of the Sonat Stock Fund (or phantom Sonat
Stock Fund) under any plan within the previous 6 months.

         For example, assume the following sequence of transactions, with no
prior discretionary transactions under any plan:

         December 1, 1998 -- you transfer 1,000 units out of the Sonat Stock
         Fund in the Savings Plan into a mutual fund.

         January 1, 1999 -- you transfer 1,000 units out of the phantom Sonat
         Stock Fund in the Supplemental Savings Plan into a phantom mutual fund.

         March 1, 1999 -- you acquire 1,000 units of the phantom Sonat Stock
         Fund in the Deferred Compensation Plan by transfer from a mutual fund.

         July 1, 1999 -- you take an in-service cash withdrawal from the Savings
         Plan which results in the liquidation of 500 units of the Sonat Stock
         Fund.

         The first two transactions are exempt under Section 16(b), because they
are both dispositions of Sonat stock or phantom stock and there was no
discretionary acquisition under any plan within the preceding six months. The
March 1 transaction is a non-exempt "purchase" under Section 16(b), because it
is a discretionary acquisition that occurs only two months after a discretionary
disposition (the January 1 transfer). The fact that the January and March
transactions occurred in different plans does not change the result. The March 1
purchase can be matched against any sale that occurs inside or outside the plans
within six months before or after March 1 (including a sale resulting from a
cashless option exercise). The July transaction is a discretionary disposition
that occurred within three months of the March 1 discretionary acquisition, so
it is a non-exempt "sale" under Section 16(b). The March purchase and the July
sale will be matched against each other for Section 16(b) short-swing profit
liability purposes.



                                       11
<PAGE>   12

C.       Distributions From the Plan

         In general, the liquidation of phantom Sonat Stock Funds units in
connection with a distribution from the Plan is a Section 16(b) "sale", unless
the Executive Compensation Committee of the Company's Board of Directors
specifically approves the related deferral election. (However, such a
liquidation is exempt under Section 16(b) if the distribution results from
termination of employment, if you did not initially elect a lump-sum payment and
subsequently change to annual installments.)

D.       Reporting Requirements

         Transactions in the Plan that result in a Section 16 "purchase" or
"sale" must be reported on Form 4. All other (exempt) transactions must be
reported on Form 5 (or, if you so elect, on an earlier Form 4). Each Form 4 or
Form 5 report that shows a transaction in phantom Sonat Stock Fund units must
show the total number of shares of phantom Sonat stock represented by the units
credited to your account in the Plan.

21.      Can the Plan be amended or discontinued?

         The Company's Board of Directors retains the right to amend or
terminate the Plan at any time. However, your accrued benefits at the time of
any amendment, suspension or termination of the Plan cannot be reduced.











                                       12
<PAGE>   13



                      SONAT INC. DEFERRED COMPENSATION PLAN
                                  PLAN SUMMARY

                                    EXHIBIT A

  Comparison of Non-qualified Deferred Compensation Plan and Before-Tax (401K)
                 Contributions to Qualified Sonat Savings Plan


<TABLE>
<CAPTION>
=====================================================================================
Non-qualified
   Deferred                                                              Qualified
 Compensation                 Principal Characteristics                Sonat Savings
     Plan                                                                  Plan
=====================================================================================
<S>              <C>                                                   <C>
     Yes                      Deferral on Pre-Tax Basis                    Yes(1)
- -------------------------------------------------------------------------------------
     Yes              FICA/Medicare/Local Withheld on Deferrals            Yes
- -------------------------------------------------------------------------------------
     Yes                  Earnings Accumulate Tax Deferred                 Yes
- -------------------------------------------------------------------------------------
      No         Actual Funds or Assets Held in Participant Accounts       Yes
- -------------------------------------------------------------------------------------
     Yes                Distributions Subject to Income Taxes              Yes
- -------------------------------------------------------------------------------------
                   Federal Income Tax Statutory Withholding Rate 
     (28%)                   on Lump-Sum Payments                          20%(2)
- -------------------------------------------------------------------------------------
      No                    Rollover into an IRA Allowed                   Yes
- -------------------------------------------------------------------------------------
      No             5 or 10 Year Income Tax Averaging Available           Yes(3)
- -------------------------------------------------------------------------------------
     Yes(4)                Hardship Withdrawals Available                  Yes
- -------------------------------------------------------------------------------------
      No                  Loans Against Accounts Available                 Yes
- -------------------------------------------------------------------------------------
      No           10% Penalty Tax for pre-age 59 1/2 distributions        Yes(2)
=====================================================================================
</TABLE>

- --------------------------

  (1)  Amount limited by IRS rules.

  (2)  If not rolled over.

  (3)  5 year averaging not available on distributions after 1999; 10 year
       averaging grandfathered for those born on or before January 1, 1936.

  (4)  "Hardship" definition is much more stringent than in the Savings Plan.





                                       13

<PAGE>   1

                                                                      EXHIBIT 12


                           SONAT INC. AND SUBSIDIARIES

                        COMPUTATION OF RATIOS OF EARNINGS
                   FROM CONTINUING OPERATIONS TO FIXED CHARGES
                              TOTAL ENTERPRISE (a)




<TABLE>
<CAPTION>
                                                                         Years Ended December 31,
                                                 -------------------------------------------------------------------------
                                                    1997            1996            1995            1994            1993
                                                 ---------       ---------       ---------       ---------       ---------
                                                                              (In Thousands)
<S>                                              <C>             <C>             <C>             <C>             <C>      
Earnings from Continuing Operations:
    Income before income taxes                   $ 256,457       $ 294,304       $ 282,497       $ 154,871       $ 364,198
    Fixed charges (see computation below)          153,051         152,830         165,154         127,909         129,160
    Less allowance for interest capitalized         (3,778)         (5,094)         (6,540)         (6,692)         (4,101)
                                                 ---------       ---------       ---------       ---------       ---------

Total Earnings Available for Fixed Charges       $ 405,730       $ 442,040       $ 441,111       $ 276,088       $ 489,257
                                                 =========       =========       =========       =========       =========


Fixed Charges:
    Interest expense before deducting
       interest capitalized                      $ 145,015       $ 145,406       $ 157,653       $ 120,295       $ 122,204
    Rentals(b)                                       8,036           7,424           7,501           7,614           6,956
                                                 ---------       ---------       ---------       ---------       ---------

                                                 $ 153,051       $ 152,830       $ 165,154       $ 127,909       $ 129,160
                                                 =========       =========       =========       =========       =========


Ratio of Earnings to Fixed Charges                     2.7             2.9             2.7             2.2             3.8
                                                 =========       =========       =========       =========       =========
</TABLE>



- -----------

(a)      Amounts include the Company's portion of the captions as they relate to
         persons accounted for by the equity method.

(b)      These amounts represent 1/3 of rentals which approximate the interest
         factor applicable to such rentals of the Company and its subsidiaries
         and unconsolidated affiliates.



<PAGE>   1

                                                                      EXHIBIT 21
                           SUBSIDIARIES OF SONAT INC.
                             AS OF FEBRUARY 10, 1998

<TABLE>
<CAPTION>
                                                               Percent of
                                            Country of           Voting
                                           Organization        Securities
                                           or, if United        Owned by
                                           States, State        Immediate
Name of Company                           of Organization        Parent
- ---------------                           ---------------      ----------
<S>                                       <C>                  <C>
SONAT INC.:

CITRUS CORP. (a)                             Delaware              50%

SNT REALTY INC. (b)                          Alabama              100%

SONAT ENERGY SERVICES COMPANY                Delaware             100%

  Sonat Intrastate-Alabama Inc.              Alabama              100%

  Sonat Marketing Company                    Delaware             100%

   Sonat Marketing Company L. P.( c)         Delaware              65%

    JV Trading Inc. (d)                      Delaware             100%

    Keystone Trading Company                 Delaware             100%

    Sonat Public Service Company L.L.C.(e)   Delaware              50%

    Unicom Gas Services LLC(f)               Delaware              50%

    Vail Trading Company                     Delaware             100%

 Sonat Power Inc. (g)                        Delaware             100%

  Sonat Mid-Georgia L.L.C.(h)                Delaware             100%

  Pacific Gas Power Inc.                     Delaware             100%

 Sonat Power Marketing Inc.                  Delaware             100%

  Sonat Power Marketing L. P. (i)            Delaware              65%

 Utilities Service Group L.P. (j)            Delaware             100%
</TABLE>

- ----------------------------
Indentations indicate subsidiaries of subsidiaries



<PAGE>   2

<TABLE>
<CAPTION>
                                                               Percent of
                                            Country of           Voting
                                           Organization        Securities
                                           or, if United        Owned by
                                           States, State        Immediate
Name of Company                           of Organization        Parent
- ---------------                           ---------------      ----------
<S>                                       <C>                  <C> 
SONAT EXPLORATION COMPANY (k)                Delaware             100%

  Field Gas Gathering Inc.                   Delaware             100%

  Sonat Minerals Inc.                        Delaware             100%

  Sonat Minerals Leasing Inc.                Delaware             100%

  Sonat Texas Gathering Company              Delaware             100%

  Sonat Oil Transmission Inc.                Delaware             100%

   Stateline Gas Gathering Company           Delaware             100%

  SONAT EXPLORATION GOM INC                  Delaware             100%

   Sonat Energy Development I Company        Delaware             100%

  SONAT POWER SYSTEMS INC                    Delaware             100%

  SONAT SERVICES INC                         Alabama              l00%

   Sonat Services (D. C.) Inc.               Delaware             100%

  SOUTHERN NATURAL GAS COMPANY               Delaware             100%

   Destin Pipeline Company LLC(l)            Delaware             33.33%

   Etowah LNG Company, L.L.C.(m)             Delaware              50%

   Sonat Gathering Company                   Delaware             100%

   Sonat Ventures Inc. (n)(o)                Delaware             100%

    Sonat NGV Technology Inc. (p)            Delaware             100%

   South Georgia Natural Gas Company         Delaware             l00%

   Southern Deepwater Pipeline Company (q)   Delaware             100%
</TABLE>


                                     - 2 -
<PAGE>   3


<TABLE>
<CAPTION>
                                                               Percent of
                                            Country of           Voting
                                           Organization        Securities
                                           or, if United        Owned by
                                           States, State        Immediate
Name of Company                           of Organization        Parent
- ---------------                           ---------------      ----------
<S>                                       <C>                  <C> 
Southern LNG Inc.                            Delaware             l00%

Southern Gas Storage Company (r)             Delaware             l00%

Southern Offshore Pipeline Company (q)       Delaware             100%
</TABLE>





Notes
- -----

(a)  Citrus Corp. owns 100 percent of the stock of Florida Gas Transmission
     Company, Florida Intrastate Pipeline Company, Citrus Trading Corp., Citrus
     Industrial Sales Company, Citrus Energy Services, Inc. and Citrus
     Interstate Pipeline Company. Houston Natural Gas Company, a wholly owned
     subsidiary of Enron Corp., owns the remaining 50 percent of Citrus Corp.

(b)  SNT Realty Inc. has a 50-percent interest in Fifth Avenue Realty Company,
     an unincorporated joint venture, the remaining 50 percent of which is owned
     by AmSouth Bank N.A.

(c)  Sonat Marketing Company is a 65-percent participant and General Partner in
     Sonat Marketing Company L. P., a limited partnership; AGL Energy Services,
     Inc., a wholly owned subsidiary of AGL Resources, Inc., holds a 35-percent
     limited partnership interest.

(d)  JV Trading Inc. has a 50-percent partnership interest in Seminole Gas
     Marketing; the remaining 50-percent partnership interest of which is held
     by Suwannee Gas Marketing, Inc., a subsidiary of Lykes Energy, Inc.

(e)  Sonat Marketing Company L.P. has a 50-percent interest in Sonat Public
     Service Company L.L.C., a limited liability company, the remaining 50
     percent of which is owned by PSNC Production Corporation, a wholly owned
     subsidiary of Public Service Company of North Carolina, Inc.

(f)  Sonat Marketing Company L.P has a 50-percent interest in Unicom Gas
     Services LLC, a limited liability company, the remaining 50 percent of
     which is held by Unicom Energy Services, Inc., a wholly owned subsidiary of
     Unicom Corporation.

(g)  Sonat Mid-Georgia L.L.C. is a 50-percent participant in Mid-Georgia Cogen
     L.P., the remaining 50 percent is held jointly by NCP Inc. and NCP Houston
     Power Inc., wholly owned subsidiaries of GPU, Inc.


                                     - 3 -
<PAGE>   4

(h)  Sonat Power Inc. is a 50-percent participant in AES/Sonat Power L.L.C., a
     limited liability company, the remaining 50-percent interest of which is
     held by AES Gas Power, Inc., a wholly owned subsidiary of The AES
     Corporation.

(i)  Sonat Power Marketing Inc. is a 65-percent participant and General Partner
     in Sonat Power Marketing L.P., a limited partnership; AGL Power Services,
     Inc., a wholly owned subsidiary of AGL Resources, Inc., holds a 35-percent
     limited partnership interest.

(j)  Sonat Energy Services Company has a 64-percent limited partnership interest
     and a 1-percent general partnership interest and Sonat Power Marketing Inc.
     has a 35-percent limited partnership interest in Utilities Service Group
     L.P., a Delaware limited partnership.

(k)  Sonat Exploration Company has a 50-percent interest in Black Warrior
     Methane Corp. and Black Warrior Transmission Corp., the remaining 50
     percent of each being owned by Jim Walter Resources, Inc.

(l)  Southern Natural Gas Company has a 33.33-percent interest in Destin
     Pipeline Company LLC, a limited liability company, the remaining
     66.66-percent interest is held equally by Amoco Destin Pipeline Company, a
     wholly owned subsidiary of Amoco Corporation, and Shell Destin, LLC, a
     wholly owned subsidiary of Shell Oil Company.

(m)  Southern Natural Gas Company is a 50-percent participant in Etowah LNG
     Company, L.L.C., a limited liability company, the remaining 50 percent is
     held by AGL Peaking Services, Inc., a wholly owned subsidiary of AGL
     Resources, Inc.

(n)  Sonat Ventures Inc. is a 50-percent participant in Monarch CNG, an Alabama
     general partnership, the remaining 50-percent interest of which is held by
     Midtown NGV, Inc., a wholly owned subsidiary of Energen Corporation.

(o)  Sonat Ventures Inc. is a 50-percent participant in Florida Natural Fuels,
     Ltd., a Florida limited partnership, the remaining 50-percent interest of
     which is held by Suwannee Gas Marketing, Inc., a wholly owned subsidiary of
     Lykes Energy, Inc.

(p)  Sonat NGV Technology Inc. is a one-half participant in NGV Southeast
     Technology Center, L.L.C., a Georgia limited liability company, the
     remaining 50 percent of which is held by Georgia Energy Company, a
     subsidiary of AGL Resources, Inc.

(q)  Southern Deepwater Pipeline Company and Southern Offshore Pipeline Company
     each have a 50-percent interest in Sea Robin Pipeline Company, an
     unincorporated joint venture.

(r)  Southern Gas Storage Company has a 50-percent interest in Bear Creek
     Storage Company, an unincorporated joint venture, the remaining 50 percent
     of which is owned by Tennessee Storage Company, a wholly owned subsidiary
     of Tennessee Gas Pipeline Company, a subsidiary of El Paso Energy
     Corporation. Bear Creek Storage Company has a l00-percent interest in Bear
     Creek Capital Corporation.

                                      -4-

<PAGE>   1
                                                                      EXHIBIT 22

 
SONAT INC.
P. O. BOX 2563, BIRMINGHAM, ALABAMA 35202              TELEPHONE: (205) 325-3800
 
 
NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
TO BE HELD APRIL 23, 1998
 
To Our Stockholders:
 
     The Annual Meeting of Stockholders of Sonat Inc., a Delaware corporation,
will be held at the AmSouth Upper Lobby Auditorium, AmSouth-Harbert Plaza,
Birmingham, Alabama, at 9:00 a.m., local time, on Thursday, April 23, 1998, for
the following purposes:
 
     1. To elect four Directors as members of the Board of Directors of the
        Company, to serve until the 2001 Annual Meeting of Stockholders and
        until their respective successors have been duly elected and qualified.
 
     2. To elect an Auditor of the Company for the ensuing year. The Board of
        Directors of the Company has recommended Ernst & Young LLP, the present
        Auditor, for election as Auditor (Proposal No. 1).
 
     3. To transact such other business as may properly be brought before the
        meeting.
 
     Only holders of Common Stock of record at the close of business on March 6,
1998, will be entitled to vote at the meeting.
 
     The meeting may be adjourned from time to time without other notice than by
announcement at the meeting, or any adjournment thereof, and any and all
business for which the meeting is hereby noticed may be transacted at any such
adjournment.
 
                                          By order of the Board of Directors,
 
                                                 /s/ Beverley T. Krannich
                                                   BEVERLEY T. KRANNICH
                                                        Secretary
 
Birmingham, Alabama
March 21, 1998
 
                             YOUR VOTE IS IMPORTANT
  PLEASE COMPLETE, SIGN AND RETURN YOUR PROXY IN THE ENCLOSED RETURN ENVELOPE.
<PAGE>   2
 
                                PROXY STATEMENT
 
               FOR ANNUAL MEETING OF STOCKHOLDERS APRIL 23, 1998
 
     This Proxy Statement is furnished in connection with the solicitation of
proxies by Sonat Inc. on behalf of the Board of Directors of the Company, to be
voted at the Annual Meeting of Stockholders, called to be held on Thursday,
April 23, 1998 at 9:00 a.m. at the AmSouth Upper Lobby Auditorium,
AmSouth-Harbert Plaza, Birmingham, Alabama. Mailing of the Proxy Statement and
the accompanying proxy card to the stockholders is expected to commence on or
about March 23, 1998.
 
VOTING SECURITIES
 
     As of January 31, 1998, the Company had outstanding 109,960,050 shares of
Common Stock, par value $1.00 per share, which are its only voting securities.
Holders of Common Stock are entitled to one vote for each share held. The Board
of Directors has fixed March 6, 1998, as the record date for the determination
of stockholders entitled to notice of, and to vote at, the Annual Meeting.
 
THE PROXY
 
     If a proxy is executed properly by a stockholder and is not revoked, it
will be voted at the Annual Meeting in the manner specified on the proxy, or if
no manner is specified, it will be voted "FOR" the election of the four nominees
for Director and "FOR" Proposal No. l. The submission of an executed proxy will
not affect a stockholder's right to attend, and to vote in person at, the Annual
Meeting. A stockholder who executes a proxy may revoke it at any time before it
is voted by filing a written revocation with the Secretary of the Company,
executing a proxy bearing a later date or attending and voting in person at the
Annual Meeting.
 
                 THE BOARD OF DIRECTORS URGES YOU TO SIGN, DATE
         AND RETURN THE ENCLOSED PROXY IN THE ENCLOSED RETURN ENVELOPE.
 
                             ELECTION OF DIRECTORS
 
     The Company's Restated Certificate of Incorporation provides for the
classification of the Board of Directors into three classes (Class I, Class II
and Class III). Four Class III Directors are to be elected at the Annual Meeting
of Stockholders to serve for a three-year term and until the election and
qualification of their respective successors in office.
 
     On January 30, 1998, pursuant to the terms of an Agreement and Plan of
Merger dated as of November 22, 1997 (the "Merger Agreement") between the
Company and Zilkha Energy Company, an oil and gas exploration, development and
production company ("Zilkha Energy"), a wholly-owned subsidiary of the Company
merged with Zilkha Energy. As provided in the Merger Agreement, at the time of
the merger the stock of Zilkha Energy was converted into the right to receive an
aggregate of 24,158,380 shares of the Company's Common Stock. Of such shares,
8,594,305 were issued to Michael S. Zilkha; 14,429,037 shares were issued to the
Selim K. Zilkha Trust (of which Selim K. Zilkha is settlor, trustee and
beneficiary); and 1,135,038 shares were issued to the Selim K. Zilkha (1996)
Annuity Trust (of which Selim K. Zilkha is beneficiary during the annuity
period). On March 29, 1998, the Selim K. Zilkha (1996) Annuity Trust will
expire, substantially all of the shares of the Company's Common Stock held in
such Trust will be distributed to Michael S. Zilkha, and the remainder of such
shares will be distributed to the Selim K. Zilkha Trust.
 
     Pursuant to the terms of the Merger Agreement, on December 5, 1997, the
Board of Directors appointed Selim K. Zilkha as a Class III Director and Michael
S. Zilkha as a Class I Director. Such appointments were effective immediately
following the effective time of the merger on January 30, 1998. The Merger
Agreement provides that as long as Michael S. Zilkha, Selim K. Zilkha and their
<PAGE>   3
 
respective affiliates own at least 8% of the Company's Common Stock, the Board
of Directors will nominate and support the reelection of the Zilkhas to the
Board following the expiration of their respective terms. If such stock
ownership drops below 8% of the Company's Common Stock, the Merger Agreement
provides that the Zilkhas will promptly tender their resignations as Directors.
 
     The four nominees for election as Class III Directors are Max L. Lukens,
Benjamin F. Payton, John J. Phelan, Jr. and Selim K. Zilkha. Each of the
nominees has been previously elected as a Director by the stockholders, except
for Selim K. Zilkha. In the event that any of the nominees becomes unavailable
for any reason, which is not anticipated, the Board of Directors in its
discretion may, unless it has taken appropriate action to provide for a lesser
number of Directors, designate a substitute nominee, in which event, pursuant to
the accompanying proxy, votes will be cast for such substitute nominee.
 
     THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" MAX L. LUKENS, BENJAMIN F.
PAYTON, JOHN J. PHELAN, JR. AND SELIM K. ZILKHA AS CLASS III DIRECTORS.
 
           NOMINEES FOR DIRECTOR -- CLASS III -- TERMS TO EXPIRE 2001
 
<TABLE>
<S>                             <C>
Max L. Lukens [Picture]         MAX L. LUKENS, age 49, is Chairman, President and Chief
                                Executive Officer of Baker Hughes Incorporated, the
                                principal business of which is the provision of products and
                                services to the petroleum and continuous process industries.
                                He has served as a Director of the Company since 1995. Mr.
                                Lukens is also a Director of Baker Hughes Incorporated and
                                Transocean Offshore Inc. During the past five years, Mr.
                                Lukens has served as an executive officer of Baker Hughes
                                Incorporated.
- --------------------------------------------------------------------------------------------
 
                                BENJAMIN F. PAYTON, age 65, is President of Tuskegee
Benjamin F. Payton [Picture]    University, a position he has held during the past five
                                years. He has served as a Director of the Company since
                                1992. Dr. Payton is also a Director of AmSouth
                                Bancorporation, ITT Corporation, Liberty Corporation,
                                Morrison's Health Care, Inc., Praxair, Inc. and Ruby
                                Tuesday, Inc.
- --------------------------------------------------------------------------------------------
 
                                JOHN J. PHELAN, JR., age 66, is the former Chairman of the
John J. Phelan, Jr. [Picture]   Board and Chief Executive Officer of the New York Stock
                                Exchange. From 1991 to 1993, he was President of the
                                International Federation of Stock Exchanges. Mr. Phelan has
                                served as a Director of the Company since 1990. He is also a
                                Director of Eastman Kodak Company, Merrill Lynch & Co., Inc.
                                and Metropolitan Life Insurance Company and a Senior Advisor
                                to The Boston Consulting Group.
- --------------------------------------------------------------------------------------------
</TABLE>
 
                                        2
<PAGE>   4
<TABLE>
<S>                             <C>
 
                                SELIM K. ZILKHA, age 70, is the former Chief Executive
Selim K. Zilkha [Picture]       Officer of Zilkha Energy. He served as the sole Director and
                                Chief Executive Officer of Zilkha Energy from March 1984
                                until January 1998. Prior to such time, Mr. Zilkha was a
                                banker with Zilkha & Sons in the United States and Europe
                                from 1947 to 1955 and in London from 1955 to 1960. In 1960,
                                he founded Mothercare, PLC, a retail chain catering to
                                mothers-to-be, babies and small children in Great Britain,
                                Europe and the United States. Mr. Zilkha sold his interest
                                in Mothercare, PLC in January 1982.
- --------------------------------------------------------------------------------------------
</TABLE>
 
            CONTINUING DIRECTORS -- CLASS I -- TERMS TO EXPIRE 1999
 
<TABLE>
<S>                             <C>
                                WILLIAM O. BOURKE, age 70, is the former Chairman of the
William O. Bourke [Picture]     Board of Directors and Chief Executive Officer of Reynolds
                                Metals Company, an aluminum and consumer products company.
                                He has served as a Director of the Company since 1990. Mr.
                                Bourke is also a Director of Merrill Lynch & Co., Inc.
                                During the past five years prior to his retirement in April
                                1992, Mr. Bourke served as an executive officer of Reynolds
                                Metals Company.
- --------------------------------------------------------------------------------------------
 
                                RONALD L. KUEHN, JR., age 62, is Chairman of the Board,
Ronald L. Kuehn, Jr. [Picture]  President and Chief Executive Officer of the Company. He has
                                served as a Director of the Company since 1981. Mr. Kuehn is
                                also a Director of AmSouth Bancorporation, Praxair, Inc.,
                                Protective Life Corporation, The Dun & Bradstreet
                                Corporation, Transocean Offshore Inc. and Union Carbide
                                Corporation, and a member of the Board of Trustees of
                                Tuskegee University and Southern Research Institute. During
                                the past five years, Mr. Kuehn has served as an executive
                                officer of the Company.
- --------------------------------------------------------------------------------------------
</TABLE>
 
                                        3
<PAGE>   5
<TABLE>
<S>                             <C>
 
                                ROBERT J. LANIGAN, age 69, is Chairman Emeritus of the Board
Robert J. Lanigan [Picture]     of Directors of Owens-Illinois, Inc., the principal business
                                of which is the manufacture and sale of packaging products.
                                He has served as a Director of the Company since 1983. Mr.
                                Lanigan is also a Director of Chrysler Corporation,
                                Cognizant Corporation, The Dun & Bradstreet Corporation and
                                Transocean Offshore Inc. During the past five years prior to
                                his appointment to his current position, Mr. Lanigan served
                                as an executive officer of Owens-Illinois, Inc.
- --------------------------------------------------------------------------------------------
 
                                CHARLES MARSHALL, age 68, is the former Vice Chairman of the
Charles Marshall [Picture]      Board of American Telephone and Telegraph Company. He has
                                served as a Director of the Company since 1982. Mr. Marshall
                                is also a Director of Ceridian Corporation, GATX
                                Corporation, Hartmarx Corporation and Sundstrand
                                Corporation. Prior to his retirement, Mr. Marshall served as
                                an executive officer of American Telephone and Telegraph
                                Company.
- --------------------------------------------------------------------------------------------
 
                                MICHAEL S. ZILKHA, age 43, is the former Executive Vice
Michael S. Zilkha [Picture]     President of Zilkha Energy. He served as an executive
                                officer of Zilkha Energy from July 1986 to January 1998. Mr.
                                Zilkha was an editor at Atlantic Monthly Press from 1985 to
                                1986, and from 1978 to 1985, he was President of ZE Records,
                                an independent record production company in New York.
- --------------------------------------------------------------------------------------------
</TABLE>
 
                                        4
<PAGE>   6
 
            CONTINUING DIRECTORS -- CLASS II -- TERMS TO EXPIRE 2000
 
<TABLE>
<S>                             <C>
                                JEROME J. RICHARDSON, age 61, is Owner/Founder of the NFL
Jerome J. Richardson [Picture]  Carolina Panthers. He has served as a Director of the
                                Company since 1991. Mr. Richardson is also a Director of
                                NCAA Foundation and a trustee of Wofford College. During the
                                past five years prior to his retirement in May 1995, Mr.
                                Richardson served as an executive officer of Flagstar
                                Companies, Inc. and Flagstar Corporation.
- --------------------------------------------------------------------------------------------
 
                                DONALD G. RUSSELL, age 66, is Vice Chairman of the Company
Donald G. Russell [Picture]     and Chairman of the Board and Chief Executive Officer of
                                Sonat Exploration Company (a wholly-owned subsidiary of the
                                Company). He has served as a Director of the Company since
                                1994. Mr. Russell is also a Director of Grant Geophysical,
                                Inc. During the past five years, Mr. Russell has served as
                                an executive officer of the Company and Sonat Exploration
                                Company.
- --------------------------------------------------------------------------------------------
 
                                ADRIAN M. TOCKLIN, age 46, is the former President and Chief
Adrian M. Tocklin [Picture]     Executive Officer -- Diversified Operations of CNA Insurance
                                Companies, the principal business of which is property and
                                casualty insurance. She has served as a Director of the
                                Company since 1994. Ms. Tocklin is also a Director and
                                Chairman of the Board of CNA Surety Corp. and of First
                                Insurance Company of Hawaii. She was President and a
                                Director of The Continental Corporation until its merger
                                with CNA Insurance Companies in May 1995. During the past
                                five years prior to her retirement in March 1998, Ms.
                                Tocklin served as an executive officer of The Continental
                                Corporation and CNA Insurance Companies.
- --------------------------------------------------------------------------------------------
</TABLE>
 
                                        5
<PAGE>   7
<TABLE>
<S>                             <C>
 
                                JAMES B. WILLIAMS, age 65, is Chairman of the Executive
James B. Williams [Picture]     Committee of the Board of Directors of SunTrust Banks, Inc.
                                He has served as a Director of the Company since 1987. Mr.
                                Williams is also a Director of The Coca-Cola Company,
                                Genuine Parts Company, Georgia-Pacific Corporation, Rollins,
                                Inc. and RPC, Inc. During the past five years prior to his
                                retirement in March 1998, Mr. Williams served as Chairman of
                                the Board and Chief Executive Officer of SunTrust Banks,
                                Inc.
- --------------------------------------------------------------------------------------------
 
                                JOE B. WYATT, age 62, is Chancellor, Chief Executive Officer
Joe B. Wyatt [Picture]          and Trustee of Vanderbilt University, a position he has held
                                during the past five years. He has served as a Director of
                                the Company since 1984. Chancellor Wyatt is also a Director
                                of Advanced Network & Services, Inc., Ingram Micro, Inc.,
                                Reynolds Metals Company, The Aerostructures Corporation and
                                University Research Association.
- --------------------------------------------------------------------------------------------
</TABLE>
 
     Selim K. Zilkha is the father of Michael S. Zilkha. There are no other
family relationships between Directors and executive officers of the Company.
 
                         BOARD MEETINGS AND COMMITTEES
 
     During 1997 the Board of Directors held eight regular and special meetings.
The Board has established Committees that assist the Board in the discharge of
its responsibilities. Each Director attended at least 75% of the meetings of the
Board and the Committees on which the Director served.
 
     Audit Committee.  The Audit Committee reviews and reports to the Board the
scope and results of audits by the Auditor and the Company's internal auditing
staff, and reviews with the Auditor the adequacy of the Company's system of
internal controls. It reviews transactions between the Company and its Directors
and officers and Company policies with respect thereto, and compliance with the
Company's business ethics and conflict of interest policies. The Committee also
recommends a firm of certified public accountants to serve as Auditor of the
Company (subject to nomination by the Board and election by the stockholders),
authorizes all audit and other professional services rendered by the Auditor and
periodically reviews the independence of the Auditor.
 
     Membership on the Audit Committee is restricted to those Directors who are
not active or retired officers or employees of the Company. The Company's policy
on Audit Committee membership complies with the Audit Committee Policy Statement
adopted by the New York Stock Exchange. The current members of the Committee are
John J. Phelan, Jr., Chairman, Charles Marshall, Jerome J. Richardson, Adrian M.
Tocklin, Joe B. Wyatt and Michael S. Zilkha. The Committee met five times during
1997.
 
                                        6
<PAGE>   8
 
     Committee on Directors.  The Committee on Directors makes recommendations
to the Board with respect to the size and composition of the Board, Board
retirement and tenure policies, and Director compensation. It also reviews the
qualifications of potential candidates for the Board of Directors, evaluates the
performance of incumbent Directors and recommends to the Board nominees to be
elected at the Annual Meeting of Stockholders. The current members of the
Committee are Charles Marshall, Chairman, William O. Bourke, Benjamin F. Payton,
John J. Phelan, Jr., Jerome J. Richardson, James B. Williams and Selim K.
Zilkha. The Committee met once during 1997.
 
     The Committee on Directors will consider nominees for Director recommended
by stockholders. Such recommendations should be submitted in writing,
accompanied by a resume of the nominee's qualifications and business experience
and a signed statement of the proposed candidate consenting to be named as a
candidate and, if nominated and elected, to serve as a Director, and addressed
to the offices of the Company to the attention of Beverley T. Krannich,
Secretary.
 
     Employee Benefits Committee.  The Employee Benefits Committee periodically
reviews the status of the Company's employee benefit programs and the
performance of the managers of the funded programs. To assist in its review, the
Committee meets periodically with the chairman of the administrative committee
of the funded plans. The current members of the Committee are Joe B. Wyatt,
Chairman, Robert J. Lanigan, Benjamin F. Payton, Adrian M. Tocklin, James B.
Williams and Michael S. Zilkha. The Committee met three times during 1997.
 
     Executive Compensation Committee.  The Executive Compensation Committee
reviews and makes recommendations to the Board with respect to the Company's
overall executive compensation policy. The Committee also reviews and approves
the compensation of the officers of the Company and makes awards under the
Executive Award Plan, Performance Award Plan and Cash Bonus Plan. Membership on
the Executive Compensation Committee is restricted to Directors who are not
active or retired officers or employees of the Company. The current members of
the Committee are Robert J. Lanigan, Chairman, William O. Bourke, Max L. Lukens,
James B. Williams and Joe B. Wyatt. The Committee met six times during 1997.
 
     Finance Committee.  The Finance Committee approves long-term financial
policies and annual financial plans, significant capital expenditures, insurance
programs and investment policies of the Company. It also makes recommendations
to the Board concerning dividend policy, the issuance and terms of debt and
equity securities and the establishment of bank lines of credit. The current
members of the Committee are James B. Williams, Chairman, Robert J. Lanigan, Max
L. Lukens, John J. Phelan, Jr., Jerome J. Richardson and Selim K. Zilkha. The
Committee met six times during 1997.
 
     Public Affairs Committee.  The Public Affairs Committee reviews the
Company's policies and practices which address issues of social and public
concern, such as government affairs, the environment, energy conservation and
charitable contributions. It also reviews stockholder relations and considers
stockholder proposals and matters of corporate governance. The current members
of the Committee are William O. Bourke, Chairman, Charles Marshall, Benjamin F.
Payton, John J. Phelan, Jr. and Adrian M. Tocklin. The Committee met twice
during 1997.
 
     Strategic Planning Committee.  The Strategic Planning Committee assists in
the formulation of the business strategies of the Company and its subsidiaries
and reviews the Company's management succession plan. The current members of the
Committee are Max L. Lukens, Chairman, William O. Bourke, Robert J. Lanigan,
Charles Marshall, Benjamin F. Payton, John J. Phelan, Jr., Jerome J. Richardson,
Adrian M. Tocklin, James B. Williams, Joe B. Wyatt, Michael S. Zilkha and Selim
K. Zilkha. The Committee met twice during 1997.
 
                                        7
<PAGE>   9
 
                       COMPENSATION OF OUTSIDE DIRECTORS
 
     FEES AND RETAINERS.  Each non-employee Director of the Company receives a
quarterly retainer of $9,000 ($10,250 for Committee Chairmen) and a fee of
$1,250 for each Board meeting and each Board Committee meeting attended, plus
incurred expenses where appropriate.
 
     Pursuant to the Director's Fees Deferral Plan, a Director may elect to
defer receipt of some or all of the Director's fees and retainer. All amounts
deferred are credited to the Director's account under the Plan. The Director may
invest the Plan balance in "phantom" investments in the Company's common stock
and eight mutual funds. The Director may choose to have the account balance
distributed in a lump sum or in annual installments, commencing upon termination
of service as a Director.
 
     RETIREMENT PLAN FOR DIRECTORS.  Directors of the Company who during some
portion of their service as Directors were not officers of the Company or its
subsidiaries are participants in the Retirement Plan for Directors. An eligible
Director who ceases being a Director after reaching age 70, completing five
years of service as a non-employee Director or as a result of death or permanent
disability, will receive a retirement benefit from the Plan. The Director may
choose to have such benefit paid as either (1) a cash lump sum in an amount
equal to the value of a series of quarterly payments equal to the retainer (as
of the date of the Director's retirement) for the period the Director served as
a non-employee Director of the Company or (2) in a series of quarterly payments
with a value equal to such lump-sum payment.
 
     RESTRICTED STOCK PLAN FOR DIRECTORS.  Each non-employee Director of the
Company is a participant in the Restricted Stock Plan for Directors. Each such
Director who is a member of the Board of Directors on April 1, 1998 (the
effective date of the Plan, as amended and restated on February 26, 1998) will
be granted 2,000 shares of restricted stock on such date. The Plan provides that
400 shares granted to each Director will vest on April 1 of each of the years
1999 through 2003.
 
     Each person who first becomes a non-employee Director after April 1, 1998
and before April 1, 2003 will be granted 33.33 shares of restricted stock for
each calendar month or fraction thereof from the Director's election as a
non-employee Director to the following March 31 (rounded to the nearest whole
share), plus 400 shares for each subsequent Plan Year (April 1-March 31) until
April 1, 2003. The product of 33.33 shares times the number of full and partial
calendar months from the Director's election as a non-employee Director to the
following March 31 (rounded to the nearest whole share) will vest on the April 1
following such election, and 400 shares will vest on each April 1 thereafter
through April 1, 2003.
 
     Each current non-employee Director has 400 shares of unvested restricted
stock (except Michael S. Zilkha and Selim K. Zilkha, each of whom has 100 shares
of such stock), which were granted under the Plan as in effect before the
February 26, 1998 amendment and restatement. Such shares will vest on April 1,
1998.
 
     All shares of restricted stock will vest immediately upon the Director's
death or disability. At the time the restricted stock vests, the Director will
receive a cash tax-offset "supplemental payment" in an amount equal to the
amount necessary to pay the federal income tax payable with respect to both the
vesting of restricted stock and receipt of the supplemental payment, assuming
the Director is taxed at the maximum effective federal income tax rate. If a
Director leaves the Board of Directors before all of the Director's shares of
restricted stock have vested, the unvested shares will be forfeited.
 
                                        8
<PAGE>   10
 
         OWNERSHIP OF COMMON STOCK BY DIRECTORS AND EXECUTIVE OFFICERS
 
     The following table shows the amount and nature of beneficial ownership of
shares of the Common Stock of the Company beneficially owned by the Directors
and certain executive officers of the Company, and by all present Directors and
executive officers of the Company as a group, as of January 31, 1998.
 
<TABLE>
<CAPTION>
                                                  AMOUNT AND NATURE OF          PERCENT OF
          NAME OF BENEFICIAL OWNER              BENEFICIAL OWNERSHIP (1)          CLASS
          ------------------------              ------------------------        ----------
<S>                                             <C>                             <C>
Richard B. Bates............................               83,815(2)                  *
William O. Bourke...........................                7,000                     *
Ronald L. Kuehn, Jr.........................              865,550(2 and3)             *
Robert J. Lanigan...........................                8,040                     *
Max L. Lukens...............................                4,107                     *
Charles Marshall............................               15,310                     *
James E. Moylan, Jr.........................              122,946(2 and4)             *
Benjamin F. Payton..........................                4,668                     *
John J. Phelan, Jr..........................                4,660                     *
Jerome J. Richardson........................                7,293                     *
James A. Rubright...........................              103,734(2)                  *
Donald G. Russell...........................              338,715(2)                  *
William A. Smith............................              226,635(2)                  *
Adrian M. Tocklin...........................                5,360(5)                  *
James B. Williams...........................               22,993                     *
Joe B. Wyatt................................                5,200                     *
Michael S. Zilkha...........................            9,731,443(6)                8.8%
  909 Fannin
  Two Houston Center, Suite 2910
  Houston, TX 77010
Selim K. Zilkha.............................           14,431,137(7)               13.1%
  750 Lausanne Road
  Los Angeles, CA 90077
All present Directors and Executive Officers
  as a Group (20 persons)...................           26,123,288(8)               23.8%
</TABLE>
 
- ---------------
* Less than 1%.
 
     NOTE 1:  Each Director and executive officer has sole voting power and sole
investment power with respect to all shares beneficially owned by such
individual, unless otherwise indicated.
 
     The number of shares shown includes 400 shares of restricted stock for each
of William O. Bourke, Robert J. Lanigan, Max L. Lukens, Charles Marshall,
Benjamin F. Payton, John J. Phelan, Jr., Jerome J. Richardson, Adrian M.
Tocklin, James B. Williams and Joe B. Wyatt, and 100 shares of restricted stock
for each of Michael S. Zilkha and Selim K. Zilkha, granted under the Company's
Restricted Stock Plan for Directors, which shares had not vested as of January
31, 1998. Such persons have the power to vote and receive dividends on such
shares, but do not have the power to dispose of, or to direct the disposition
of, such shares until such shares are vested pursuant to the terms of such plan.
 
     The number of shares shown includes 2,000 shares of restricted stock for
each of William O. Bourke, Robert J. Lanigan, Max L. Lukens, Charles Marshall,
Benjamin F. Payton, John J. Phelan, Jr., Jerome J. Richardson, Adrian M.
Tocklin, James B. Williams, Joe B. Wyatt, Michael S. Zilkha and Selim K. Zilkha,
to be granted under the Company's Restricted Stock Plan for Directors on April
1, 1998.
 
     The number of shares shown includes "phantom" shares of the Company's
Common Stock held by the following individuals: (a) Charles Marshall, 5,710
phantom shares; Adrian M. Tocklin, 727 phantom shares; and James B. Williams,
5,793 phantom shares (all held under the Company's Director's Fees Deferral
Plan); and (b) Richard B. Bates, 675 phantom shares; Ronald L.
 
                                        9
<PAGE>   11
 
Kuehn, Jr., 29,348 phantom shares; James E. Moylan, Jr., 312 phantom shares;
James A. Rubright, 605 phantom shares; Donald G. Russell, 16,821 phantom shares;
and William A. Smith, 733 phantom shares (all held under the Company's
Supplemental Benefit Plan and Deferred Compensation Plan).
 
     NOTE 2:  The number of shares shown for Messrs. Bates, Kuehn, Moylan,
Rubright, Russell and Smith includes 7,900 shares, 118,400 shares, 11,800
shares, 7,900 shares, 18,000 shares and 7,700 shares, respectively, of
restricted stock granted under the Company's Executive Award Plan, which shares
had not vested as of January 31, 1998. Such persons have the right to vote and
receive dividends on such shares, but do not have the power to dispose of, or to
direct the disposition of, such shares until such shares are vested pursuant to
the terms of such plan. The number of shares shown for Messrs. Bates, Kuehn,
Moylan, Rubright, Russell and Smith also includes (a) 9,072 shares, 49,328
shares, 11,100 shares, 411 shares, 12,250 shares and 16,872 shares,
respectively, held by the Trustee under the Company's Savings Plan as of January
31, 1998; and (b) 60,000 shares, 651,300 shares, 96,000 shares, 89,500 shares,
267,600 shares and 184,400 shares, respectively, covered by options under the
Company's Executive Award Plan which were exercisable within sixty days after
January 31, 1998.
 
     NOTE 3:  The number of shares shown for Mr. Kuehn includes 10,500 shares
owned by his wife, 20 shares owned by his children, and 2,000 shares held in
trust for his children, of which shares he disclaims any beneficial ownership.
 
     NOTE 4:  The number of shares shown for Mr. Moylan includes 1,237 shares
owned by his wife, of which shares he disclaims any beneficial ownership.
 
     NOTE 5:  The number of shares shown for Ms. Tocklin includes 100 shares
owned by her husband, of which shares she disclaims any beneficial ownership.
 
     NOTE 6:  The number of shares shown for Michael S. Zilkha includes
1,135,038 shares held in the Selim K. Zilkha (1996) Annuity Trust (the "Trust"),
of which Selim K. Zilkha is the sole beneficiary during the annuity period. On
March 29, 1998, the Trust will expire, substantially all of the shares held in
the Trust will be distributed to Michael S. Zilkha, and the remainder of such
shares will be distributed to the Selim K. Zilkha Trust.
 
     NOTE 7:  The number of shares shown for Selim K. Zilkha includes 14,429,037
shares held in the Selim K. Zilkha Trust (of which Mr. Zilkha is settlor,
trustee and beneficiary).
 
     NOTE 8:  The number of shares shown includes 184,400 shares of restricted
stock granted under the Company's Executive Award Plan, which shares had not
vested as of January 31, 1998; 118,119 shares held by the Trustee under the
Company's Savings Plan as of January 31, 1998; 1,445,640 shares covered by
options under the Company's Executive Award Plan which were exercisable within
sixty days after January 31, 1998; 4,200 shares of restricted stock granted
under the Company's Restricted Stock Plan for Directors, which shares had not
vested as of January 31, 1998; 24,000 shares of restricted stock to be granted
under the Company's Restricted Stock Plan for Directors on April 1, 1998; and
61,953 phantom shares of the Company's Common Stock held under the Company's
Director's Fees Deferral Plan, Supplemental Benefit Plan and Deferred
Compensation Plan as of January 31, 1998.
 
                       COMPENSATION OF EXECUTIVE OFFICERS
 
REPORT OF THE EXECUTIVE COMPENSATION COMMITTEE
 
     The Executive Compensation Committee of the Board of Directors of the
Company, which is composed solely of non-employee Directors, administers the
Company's executive compensation program. The Committee's primary responsibility
is to ensure that the executive compensation program furthers the interests of
the Company and its stockholders.
 
                                       10
<PAGE>   12
 
     The Company's executive compensation program has three principal
objectives: (1) to attract and retain a highly qualified and motivated
management team; (2) to appropriately reward individual executives for their
contributions to the attainment of the Company's key strategic goals; and (3) to
link the interests of executives and stockholders through stock-based plans and
performance measures.
 
     The Committee meets with outside consultants at least annually to evaluate
the Company's performance against the performance of a peer group of companies
and to review and compare the level of compensation paid or awarded to key
executives to the compensation practices of the peer group. The peer group used
for determining 1997 compensation for corporate executives consisted of 18
publicly held companies in the energy business (the "Corporate Peer Group"). In
comparing the level of the Company's compensation to that of the companies in
the Corporate Peer Group, the Committee reviews an analysis which "size-adjusts"
the compensation paid by a company to take into account the relative size of the
company as measured by its revenues. The recommended size-adjustment is computed
by an independent compensation consulting firm. The Committee also reviews and
may give greater weight to compensation survey data specific to a particular
business segment when considering the compensation of executive officers whose
job is related primarily to a single business segment. The Standard & Poor's
Natural Gas Distribution/Pipeline Group described in the five-year total
stockholder return comparison on page 19 of this Proxy Statement is not used to
determine the compensation of executives, because that group includes primarily
natural gas distribution companies and does not adequately represent the broader
energy industry from which the Company recruits.
 
     The key components of the Company's executive compensation program are base
salary, annual cash bonus incentives, and long-term stock incentives. The
Committee's policies with respect to each component of the program, including
the bases for the compensation of Mr. Kuehn, Chairman of the Board, President
and Chief Executive Officer of the Company, are described below. The Committee
consults with Mr. Kuehn in reviewing the individual performance and compensation
of key executives of the Company (other than Mr. Kuehn). The Committee reviews
Mr. Kuehn's performance and compensation in executive session at least annually.
 
     BASE SALARIES.  Base salaries are initially established by an evaluation of
the executive's position, responsibilities and experience and a review of salary
surveys. Each year the Committee reviews the base salaries of key executive
officers of the Company and its subsidiaries and determines whether salaries
should be adjusted, based primarily on the executive's individual performance
and experience and salary survey information. In general, the Committee's
objective is to maintain executive salaries at the median of the salaries for
comparable executives in the Corporate Peer Group or other relevant peer group.
Executive salaries for 1997 were slightly above the median level overall,
although some executives were below and some above the median. Mr. Kuehn has
been in his current position for approximately 13 1/2 years. His salary for 1997
(which included a 5.1% increase, effective April 1) was 3% above the median of
the Corporate Peer Group.
 
     ANNUAL CASH BONUS INCENTIVES.  Annual cash bonus incentive opportunities
are awarded each year. The amount of an executive's bonus opportunity (which is
expressed as a percentage of base salary) is dependent primarily upon such
individual's position and responsibilities and bonus opportunities provided to
comparable positions within the Corporate Peer Group or other relevant peer
group. At the beginning of each year, the Committee reviews and approves annual
performance goals. Shortly after the end of the year, the Committee determines
the appropriate bonus payout levels based on the degree to which these goals
have been achieved. The annual incentive program is designed to pay total annual
cash compensation in the upper quartile of the relevant peer group when the
Company meets or exceeds substantially all of the goals established for an
executive's bonus opportunity. Similarly, when the goals are not achieved, the
program is intended to result in total annual cash compensation below the median
of the relevant peer group.
 
                                       11
<PAGE>   13
 
     The payout of an executive's 1997 bonus opportunity was based on the level
of achievement of certain financial goals, corporate and subsidiary goals, and
individual goals, as described below. The goals for each executive's bonus
opportunity were weighted as follows: financial goals -- 50% for Mr. Kuehn and
40-50% for the other named executive officers; corporate and subsidiary goals --
35% for Mr. Kuehn and 35-45% for the other named executive officers; and
individual goals -- 15% for all executives. The Committee also has the
discretion to make additional cash bonus awards to recognize exceptional
individual performance.
 
     The financial goals included in the 1997 bonus opportunities were the
Company's 1997 earnings per share ("EPS") as compared to EPS targets established
by the Committee, the Company's five-year average cash flow return on assets as
compared to that of a group of energy companies whose aggregate asset mix
approximates that of the Company (the "Financial Peer Group") and, for the
subsidiary officers, subsidiary earnings before interest, taxes and corporate
charges ("EBITC") as compared to EBITC targets established by the Committee.
Payout of the earnings goals was based on comparison of actual earnings to the
earnings targets, provided that a minimum level of EPS or EBITC was required for
any payout to be made. The payout of the cash flow return on assets goal was
based on the Company's performance against the mean of the Financial Peer Group.
 
     The corporate and subsidiary business goals included in the 1997 bonus
opportunities included operating, marketing and strategic goals relating to each
major business segment, and goals relating to safety and the environment, human
resources, and corporate citizenship. When appropriate, an executive's goals
focused on the company for which he was primarily employed. Achievement of many
of the goals was determined by quantitative or objective measures, while other
goals were subjective in nature.
 
     Each executive's 1997 bonus opportunity included individual performance.
Mr. Kuehn's individual performance was based primarily on the Committee's
assessment of his leadership for the year.
 
     In January 1998, the Committee reviewed in detail the extent to which the
1997 performance goals had been achieved. The Company's EPS was below the
minimum payout level, while cash flow return on assets was significantly above
the mean for the Financial Peer Group. The payout percentage was 100% of the
bonus opportunity for the cash flow return on assets goal; no payout was made
with respect to the bonus opportunity for the EPS goal. The level of achievement
of subsidiary financial goals varied among the business segments. The Sonat
Pipeline Group significantly exceeded its earnings target, while Sonat
Exploration Company had earnings below the minimum payout level.
 
     The level of achievement of corporate and subsidiary business goals varied
considerably among the Company's business segments. The payout percentage for
corporate and subsidiary business goals ranged from 59% to 98%.
 
     Including individual performance, the total bonus payout percentages under
the 1997 annual incentive program for executives ranged from 39% to 106%. Mr.
Kuehn's total bonus payout percentage for 1997 was 70% of his bonus opportunity.
 
     LONG-TERM STOCK INCENTIVES.  The long-term stock incentives component of
the Company's executive compensation program is designed to align executive and
stockholder interests by rewarding executives for the attainment of stock price
appreciation and total stockholder returns.
 
     As a general rule, the Committee administers the long-term stock incentive
program through annual grants of stock options and restricted stock to certain
executive officers of the Company and its major operating subsidiaries. Awards
under the annual grant program were made in December 1997. In addition, the
Committee may make special awards to individual executives during the year on a
discretionary basis.
 
     In 1997, the number of stock options and restricted shares granted to each
executive officer as part of the annual grant program was determined primarily
by individual position and responsibili-
 
                                       12
<PAGE>   14
 
ties, compensation survey data of the Company's Corporate Peer Group, and the
Company's three-year total stockholder return (considering stock price
appreciation and dividends paid, and weighted for most recent performance) as
compared to the total stockholder return of the Financial Peer Group. The amount
of an executive's annual long-term incentive grant was expressed as a percentage
of base salary. The percentage used for each executive was tied to the Company's
total stockholder return as compared to that of the Financial Peer Group. In
1997, the Company's weighted annualized three-year total stockholder return was
at the 40th percentile of the Financial Peer Group. The December 1997 long-term
incentive grants were designed to reflect that performance and to result in
long-term compensation in the 40th to 50th percentile of the Corporate Peer
Group. For purposes of determining the value of long-term incentive
compensation, an independent compensation consulting firm uses a modified
Black-Scholes option pricing model to value stock options granted by the Company
and the companies in the Corporate Peer Group. Similarly, the consulting firm
values restricted share grants based on the present value of the shares on the
date of grant (taking into account the vesting schedules of the grants and
projected executive turnover). The Committee may adjust the grants to take into
account individual performance and the number of options and restricted shares
previously granted to the executive.
 
     In December 1997, Mr. Kuehn was awarded stock options and restricted stock
as a part of the annual program. As discussed above, the amount of this award
was intended to compensate Mr. Kuehn for the performance of the Company's stock
as compared to the Financial Peer Group and to result in long-term compensation
at slightly below the median of the Corporate Peer Group.
 
     STOCK OWNERSHIP GUIDELINES.  The Committee has established guidelines
designed to encourage key executives of the Company and its subsidiaries to
attain specified levels of stock ownership over a five-year period. Stock
ownership goals are based on the value of the Company's stock, and are expressed
as a multiple of the executive's base salary. The Committee periodically reviews
the guidelines and the executives' progress toward attaining the stock ownership
goals.
 
     POLICY WITH RESPECT TO SECTION 162(m).  Section 162(m) of the Internal
Revenue Code limits the tax deduction that the Company or its subsidiaries can
take with respect to the compensation of certain executive officers, unless the
compensation is "performance-based." The Committee expects that all income
recognized by executive officers with respect to restricted stock and stock
options granted under the Executive Award Plan, and the portion of the Company's
annual cash bonus program that is based on objective financial and operating
measures, will qualify as performance-based compensation.
 
     The Committee feels that it should not use only mechanical formulas in
carrying out its responsibilities for compensating the Company's management.
Therefore, the Committee currently intends to continue to make cash bonus
payments that are based on the achievement of subjective, non-quantifiable
goals, and that may therefore not qualify as performance-based compensation. The
Committee believes that these Company, subsidiary and individual goals, while
not properly measurable by the kind of quantifiable targets that are required to
qualify compensation as performance-based, are important to the long-term
financial success of the Company and to its stockholders.
 
     CONCLUSION.  The Committee believes that the executive compensation
philosophy that it has adopted effectively serves the interests of the
stockholders and the Company. It is the Committee's intention that the pay
delivered to executives be commensurate with Company performance.
 
<TABLE>
<S>                <C>                <C>                <C>           <C>
Robert J. Lanigan                     William O. Bourke                Max L. Lukens
                   James B. Williams                     Joe B. Wyatt
</TABLE>
 
                                       13
<PAGE>   15
 
SUMMARY COMPENSATION TABLE
 
     The following table shows, for the fiscal years ending December 31, 1995,
1996 and 1997 the cash compensation paid by the Company, and a summary of
certain other compensation paid or accrued for such years, to certain of the
Company's executive officers (as determined pursuant to the rules of the
Securities and Exchange Commission) (the "named executive officers") for service
in all capacities with the Company and its subsidiaries.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                           LONG TERM COMPENSATION
                                          ANNUAL COMPENSATION                      AWARDS
                                   ----------------------------------    --------------------------
                                                                                         SECURITIES
                                                                         RESTRICTED      UNDERLYING    ALL OTHER
         NAME AND                                        OTHER ANNUAL      STOCK          OPTIONS/    COMPENSATION
    PRINCIPAL POSITION       YEAR   SALARY     BONUS     COMPENSATION    AWARDS(1)          SARS          (2)
    ------------------       ----  --------   --------   ------------    ----------      ----------   ------------
 <S>                         <C>   <C>        <C>        <C>             <C>             <C>          <C>
 Ronald L. Kuehn, Jr.,       1997  $770,500   $550,000    $        0      $385,528(4)      92,000       $105,522
 Director, Chairman of       1996  $736,500   $800,000    $2,154,978(3)   $748,800(5)      82,500       $111,058
 the Board, President and    1995  $710,000   $418,600    $  332,396(3)   $306,375(6)      79,200       $108,107
 Chief Executive Officer
 
 Richard B. Bates,           1997  $256,875   $138,300    $  165,553(3)   $ 70,096(4)      20,000       $ 29,132
 Senior Vice President       1996  $241,875   $165,000    $        0      $208,000(5)      20,000       $ 28,023
                             1995  $222,500   $ 84,900    $        0      $ 74,175(6)      18,000       $ 26,100
 
 James E. Moylan, Jr.,       1997  $259,000   $132,100    $        0      $ 70,096(4)      25,000       $ 30,098
 Senior Vice President       1996  $245,000   $190,000    $        0      $208,000(5)      20,000       $ 29,131
 and Chief Financial
 Officer                     1995  $226,250   $131,100    $        0      $ 74,175(6)      18,000       $ 27,284
 
 James A. Rubright,          1997  $314,250   $163,600    $        0      $ 70,096(4)      25,000       $ 41,810
 Senior Vice President       1996  $300,250   $193,700    $        0      $208,000(5)      20,000       $ 41,246
                             1995  $287,750   $117,100    $        0      $ 74,175(6)      18,000       $ 40,534
 
 Donald G. Russell,          1997  $522,500   $196,300    $  880,075(3)   $175,240(4)      46,000       $ 44,413
 Director and                1996  $481,500   $469,400    $        0      $468,000(5)      53,000       $ 40,928
 Vice Chairman               1995  $465,750   $184,400    $        0      $161,250(6)      45,000       $ 39,588
 
 William A. Smith,           1997  $365,000   $131,300    $  669,098(3)   $ 70,096(4)      23,000       $ 43,547
 Executive Vice President    1996  $365,000   $218,300    $  919,299(3)   $197,600(5)      17,000       $ 44,260
 and General Counsel         1995  $361,250   $135,300    $  188,043(7)   $ 74,175(6)      18,000       $ 45,560
</TABLE>
 
     NOTE 1:  The amount shown represents the dollar value of restricted stock
awards made during the year, calculated by multiplying the closing price of
unrestricted shares of the Company's Common Stock on the date of grant by the
number of shares awarded. Dividends are paid on all shares of restricted stock.
 
     All shares of restricted stock granted to Messrs. Bates, Moylan, Rubright
and Smith generally vest at the earlier of age 65 or 10 years from the date of
grant, unless the average closing price of the Company's Common Stock achieves
certain specified levels, in which case vesting of such shares is accelerated.
All shares of restricted stock granted to Mr. Kuehn generally vest on April 1,
2001. The shares of restricted stock granted to Mr. Russell in 1995 and 1996
generally vest at age 67; the shares of restricted stock granted to Mr. Russell
in 1997 generally vest on January 1, 2000.
 
     All shares of restricted stock that have not previously vested are
generally forfeited upon termination of employment, unless such termination
occurs either by reason of death or disability or for the convenience of the
Company (as determined by the Executive Compensation Committee). All shares of
restricted stock that have not previously vested will immediately vest upon a
"Change of Control" of the Company, as described under "Compensation Upon Change
of Control" below.
 
     The number of shares of restricted stock held by the named executive
officers as of December 31, 1997, and the value of such shares (calculated by
multiplying the closing price of unrestricted shares of the Company's Common
Stock on December 31, 1997 ($45.75) by the number of shares held on such date)
is as follows: Mr. Kuehn, 118,400 shares, $5,416,800; Mr. Bates, 7,900 shares,
$361,425; Mr. Moylan, 11,800 shares, $539,850; Mr. Rubright, 7,900 shares,
$361,425; Mr. Russell, 18,000 shares, $823,500; and Mr. Smith, 7,700 shares,
$352,275.
 
                                       14
<PAGE>   16
 
     NOTE 2:  With respect to 1997, represents the following amounts for each of
Messrs. Kuehn, Bates, Moylan, Rubright, Russell and Smith, respectively: (1)
Company matching contributions to the trust established under the Company's
Savings Plan -- $13,600, $13,600, $10,700, $13,600, $13,600 and $10,700; (2)
Company contributions to the Savings Plan accounts under the Company's
Supplemental Benefit Plan -- $51,893, $8,234, $11,315, $13,111, $30,813 and
$20,325; and (3) with respect to premiums paid by the Company under the
Company's "split-dollar" Executive Life Insurance Program, the sum of (a) the
value of the premium payment used to purchase term life insurance plus (b) the
value of the benefit to the executive officer of the remainder of the premium
payment -- $40,029, $7,298, $8,083, $15,099, $0 and $12,522.
 
     NOTE 3:  Represents the amount of tax-offset "supplemental payments" paid
upon the exercise of stock options (or tandem stock appreciation rights) granted
under the Company's Executive Award Plan.
 
     NOTE 4:  Represents the value of 8,800 shares, 1,600 shares, 1,600 shares,
1,600 shares, 4,000 shares and 1,600 shares of restricted stock granted on
December 5, 1997 to Messrs. Kuehn, Bates, Moylan, Rubright, Russell and Smith,
respectively.
 
     NOTE 5:  Represents the value of 14,400 shares, 4,000 shares, 4,000 shares,
4,000 shares, 9,000 shares and 3,800 shares of restricted stock granted on
December 5, 1996 to Messrs. Kuehn, Bates, Moylan, Rubright, Russell and Smith,
respectively.
 
     NOTE 6:  Represents the value of 9,500 shares, 2,300 shares, 2,300 shares,
2,300 shares, 5,000 shares and 2,300 shares of restricted stock granted on
November 30, 1995, to Messrs. Kuehn, Bates, Moylan, Rubright, Russell and Smith,
respectively.
 
     NOTE 7:  Includes (a) a $119,353 tax-offset "supplemental payment" paid
upon the exercise of stock options granted under the Company's Executive Award
Plan, (b) $59,663 for housing allowances and moving expenses related to Mr.
Smith's relocation from Birmingham, Alabama to Houston, Texas, and (c)
tax-reimbursement payments of $9,027 made with respect to such moving expenses.
 
OPTION GRANT TABLE
 
     The following table contains certain information with respect to stock
options (and tandem stock appreciation rights that become exercisable only upon
certain change of control events ("Limited SARs")) granted in 1997 under the
Company's Executive Award Plan to the named executive officers.
 
                     OPTION/SAR GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                    POTENTIAL REALIZABLE VALUE AT
                                                                                    ASSUMED ANNUAL RATES OF STOCK
                                                                                    PRICE APPRECIATION FOR OPTION
                                            INDIVIDUAL GRANTS                              TERM (10 YEARS)
                         -------------------------------------------------------   -------------------------------
                          NUMBER OF      % OF TOTAL                                      5%              10%
                          SECURITIES    OPTIONS/SARS                                 (RESULTING       (RESULTING
                          UNDERLYING     GRANTED TO      EXERCISE                  COMPANY STOCK    COMPANY STOCK
                         OPTIONS/SARS    EMPLOYEES        PRICE       EXPIRATION      PRICE OF         PRICE OF
         NAME             GRANTED(1)      IN 1997      ($/SHARE)(2)    DATE(3)       $71.36)(4)      $113.63)(4)
         ----            ------------   ------------   ------------   ----------   --------------   --------------
<S>                      <C>            <C>            <C>            <C>          <C>              <C>
All Stockholders.......         --            --              --            --     $3,029,399,378   $7,677,410,691
Ronald L. Kuehn, Jr....     92,000          12.9%         $43.81       12/4/07     $   2,534,600    $    6,423,440
Richard B. Bates.......     20,000           2.8%         $43.81       12/4/07     $     551,000    $    1,396,400
James E. Moylan, Jr....     25,000           3.5%         $43.81       12/4/07     $     688,750    $    1,745,500
James A. Rubright......     25,000           3.5%         $43.81       12/4/07     $     688,750    $    1,745,500
Donald G. Russell......     46,000           6.5%         $43.81       12/4/07     $   1,267,300    $    3,211,720
William A. Smith.......     23,000           3.2%         $43.81       12/4/07     $     633,650    $    1,605,860
Named Executive Officers' Potential Realizable Value as a % of All Stockholders'
  Potential Realizable Value                                                               0.21%             0.21%
</TABLE>
 
                                       15
<PAGE>   17
 
     NOTE 1:  All stock options shown in the table were granted on December 5,
1997. Each stock option was granted with a tandem Limited SAR that may be
exercised only within 60 days after an SAR Change of Control (as defined under
"Compensation Upon Change of Control" below). For more information on Limited
SARs, see "Compensation Upon Change of Control" below.
 
     The stock options (and tandem Limited SARs) shown in the table become
exercisable in equal installments on each of the first five anniversaries of the
date of grant, provided that the entire grant will become immediately
exercisable if, during any 10 business day period ending prior to December 5,
2002, the average of the closing prices of the Company's Common Stock during
such period is at least $65.06. Any stock options (and tandem Limited SARs) that
have not previously become exercisable are generally forfeited upon termination
of employment, unless such termination occurs by reason of normal retirement,
death, disability or for the convenience of the Company (as determined by the
Executive Compensation Committee). Any options (and tandem Limited SARs) held by
then-current employees will become immediately exercisable in the event of a
"Change of Control" of the Company, as described under "Compensation Upon Change
of Control" below.
 
     NOTE 2:  The exercise price equals the closing price of the Company's
Common Stock on the date of grant.
 
     NOTE 3:  The stock options (and tandem Limited SARs) are subject to
termination prior to their expiration date in the event of termination of
employment.
 
     NOTE 4:  The Resulting Company Stock Price shown in the table equals the
price the Company's Common Stock would attain at the end of the option's 10-year
term if the price of the Company's Common Stock appreciated from the date of
stock option grant at a rate of 5% or 10% per year (as the case may be). The
potential realizable values shown represent the difference between the $71.36 or
$113.63 Resulting Company Stock Price (as the case may be) and the $43.81
exercise price, multiplied by (a) for all stockholders, the number of
outstanding shares of the Company's Common Stock as of January 31, 1998, and (b)
for each named executive officer, the number of options granted.
 
AGGREGATED OPTION/SAR EXERCISES AND FISCAL YEAR-END OPTION/SAR VALUE TABLE
 
     The following table shows certain information with respect to the named
executive officers concerning the exercise of stock options (or stock
appreciation rights ("SARs") granted in tandem therewith) during 1997 and
unexercised stock options (and tandem SARs) held as of December 31, 1997.
 
<TABLE>
<CAPTION>
                                        AGGREGATED OPTION/SAR EXERCISES IN LAST FISCAL YEAR AND
                                                   FISCAL YEAR-END OPTION/SAR VALUES
                           ---------------------------------------------------------------------------------
                                                            NUMBER OF
                                                      SECURITIES UNDERLYING         VALUE OF UNEXERCISED,
                            SHARES                  UNEXERCISED OPTIONS/SARS      IN-THE-MONEY OPTIONS/SARS
                           ACQUIRED                   AT FISCAL YEAR END(1)         AT FISCAL YEAR END(2)
                              ON        VALUE      ---------------------------   ---------------------------
          NAME             EXERCISE    REALIZED    EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
          ----             --------    --------    -----------   -------------   -----------   -------------
<S>                        <C>        <C>          <C>           <C>             <C>           <C>
Ronald L. Kuehn, Jr......        0    $        0     651,300        158,000      $13,805,100     $178,480
Richard B. Bates.........   10,000    $  240,313      60,000         36,000      $   923,750     $ 38,800
James E. Moylan, Jr......        0    $        0      96,000         41,000      $ 1,741,825     $ 48,500
James A. Rubright........        0    $        0      89,500         41,000      $ 1,399,563     $ 48,500
Donald G. Russell........   40,000    $1,277,500     267,600         88,400      $ 5,002,938     $ 89,240
William A. Smith.........   30,000    $  971,250     184,400         36,600      $ 3,751,063     $ 44,620
</TABLE>
 
     NOTE 1:  Certain stock options granted before December 6, 1991, were
granted with tandem SARs. Each stock option granted before December 6, 1991 was
granted with a tax-offset "supplemental payment" payable upon the exercise of
the stock option (or tandem SAR). The amount of the supplemental payment is the
amount necessary to pay the federal income tax payable with respect to both (1)
exercise of the stock option (or tandem SAR) and (2) receipt of the
 
                                       16
<PAGE>   18
 
supplemental payment, based on the assumption that the participant is taxed at
the maximum effective federal income tax rate applicable to such income.
 
     NOTE 2:  The value of each unexercised in-the-money stock option (or tandem
SAR) is equal to the difference between $45.75 (the closing price of the
Company's Common Stock on December 31, 1997) and the exercise price of the stock
option. Such value does not include the value of any tax-offset supplemental
payments.
 
DEFINED BENEFIT PLANS
 
     Employees and officers of the Company and participating subsidiaries are
participants in the Company's Retirement Plan. In general, annual retirement
benefits are based on average covered compensation for the highest five
consecutive years of the final ten years of employment. Covered compensation
under the Retirement Plan currently includes salaries and amounts paid under the
Performance Award Plan and the Cash Bonus Plan (reported in the Summary
Compensation Table); covered compensation does not include amounts relating to
the grant or vesting of restricted stock, the exercise of stock options and
SARs, and receipt of supplemental payments under the Executive Award Plan, or to
employer contributions under the Savings Plan or the Supplemental Benefit Plan.
 
     The maximum annual retirement benefit is 65% of the participant's average
covered compensation minus 50% of his primary social security benefit.
Participants accrue benefits under the following formula: (a) 2.4% of average
covered compensation minus 2.0% of primary social security benefits for each
year of service before January 1, 1992; plus (b) 2.0% of average covered
compensation minus 1.667% of primary social security benefits for each year of
service after January 1, 1992; plus (c) when the total of (a) plus (b) above
equals 60% of average covered compensation minus 50% of primary social security
benefits, 1% of average covered compensation for each year of service after
January 1, 1992, not included in the calculation in (b) above, up to five such
additional years of service. The eligible survivors of a deceased Retirement
Plan participant are entitled to a survivors benefit, which equals 75% or 50% of
the participant's retirement benefit (depending upon the participant's date of
hire, age and years of service). Retirement Plan benefits are generally paid as
life annuities.
 
     The Supplemental Benefit Plan provides its eligible participants and their
eligible survivors with retirement and survivors benefits which would have been
payable under the Retirement Plan but for the fact that benefits payable under
funded pension plans are limited by federal tax laws. As a general rule, during
1997 the federal tax laws limited annual benefits under the Retirement Plan to
$125,000 (subject to reduction in certain circumstances), and required the
Retirement Plan to disregard any portion of the participant's 1997 compensation
in excess of $160,000. A participant may choose to have benefits under the Plan
paid either as a life annuity or in a cash lump sum upon termination of
employment.
 
     The following table sets forth information with respect to the named
executive officers concerning the benefits payable under the Retirement Plan and
Supplemental Benefit Plan.
 
                                       17
<PAGE>   19
 
                           DEFINED BENEFIT PLAN TABLE
 
<TABLE>
<CAPTION>
                                                 CURRENT                         ESTIMATED ANNUAL
                                                 YEARS OF      1997 COVERED         RETIREMENT
                     NAME                       SERVICE(1)    COMPENSATION(2)       BENEFIT(3)
                     ----                       ----------    ---------------    ----------------
<S>                                             <C>           <C>                <C>
Ronald L. Kuehn, Jr. .........................     27.4         $1,570,500          $1,020,825
Richard B. Bates..............................     12.8         $  421,875          $  272,531
James E. Moylan, Jr. .........................     21.5         $  449,000          $  291,850
James A. Rubright.............................      3.8         $  507,950          $  190,481
Donald G. Russell.............................      9.9         $  991,900          $  255,249
William A. Smith..............................     27.7         $  583,300          $  379,145
</TABLE>
 
     NOTE 1:  The number of years of credited service under the Retirement Plan
and Supplemental Benefit Plan as of December 31, 1997.
 
     NOTE 2:  The amount of covered compensation under the Retirement Plan and
Supplemental Benefit Plan during 1997.
 
     NOTE 3:  The estimated annual retirement benefit payable as a single life
annuity to the named executive officer (based on the assumptions that such
officer has average covered compensation at his retirement date equal to his
1997 covered compensation, and calculated prior to the offset for primary social
security benefits). The assumed retirement dates are April 1, 2001 for Mr.
Kuehn; January 1, 2000 for Mr. Russell; and age 65 for the other named executive
officers.
 
                                       18
<PAGE>   20
 
PERFORMANCE GRAPH
 
     The following graph compares the cumulative total stockholder return on the
Company's Common Stock for the five-year period ending December 31, 1997, with
the cumulative total return of two indices during such period.
 
          COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL STOCKHOLDER RETURN
                 SONAT INC.; STANDARD & POOR'S 500 STOCK INDEX;
          STANDARD & POOR'S NATURAL GAS DISTRIBUTION/PIPELINE GROUP(1)
 
<TABLE>
<CAPTION>
        MEASUREMENT PERIOD
      (FISCAL YEAR COVERED)            SONAT INC.            S&P 500         S&P NATURAL GAS
<S>                                    <C>                   <C>             <C>
12/31/92                                 100.00              100.00              100.00
12/31/93                                 124.08              110.03              118.64
12/31/94                                 124.81              111.53              113.25
12/31/95                                 164.24              153.29              160.01
12/31/96                                 243.38              188.39              212.50
12/31/97                                 220.87              251.16              250.59
</TABLE>
 
     The total returns set forth above assume that $100 was invested in the
Company's Common Stock and each of the indices set forth above on December 31,
1992, and that all dividends were reinvested.
 
     NOTE 1:  The Standard & Poor's Natural Gas Distribution/Pipeline Group
consists of the following companies: The Coastal Corporation, The Columbia Gas
System, Inc., Consolidated Natural Gas Company, Eastern Enterprises, Enron
Corp., NICOR Inc., ONEOK Inc., Pacific Enterprises, Peoples Energy Corporation,
Sonat Inc. and The Williams Companies, Inc.
 
COMPENSATION UPON CHANGE OF CONTROL
 
     Certain of the Company's benefit plans provide for the acceleration of
certain benefits in the event of a "Change of Control" of the Company. Under
such plans, a Change of Control will be deemed to have occurred if (1) any
person or group becomes the owner of (or obtains the right to acquire) 20% or
more of the Company's common stock or outstanding voting securities (with
certain exceptions, as set forth in the plans); (2) the individuals who, as of
December 1, 1995, constituted the Board of Directors (the "Incumbent Board"),
cease to be at least a majority of the Board of Directors (but including as
Incumbent Board members, except as otherwise provided, any director whose
election or nomination was approved by the Incumbent Board); or (3) there is
 
                                       19
<PAGE>   21
 
consummation of a reorganization, consolidation or merger involving the Company,
or sale of all or substantially all of the Company's assets, unless the
stockholders and Board of Directors of the Company before the transaction
control the resulting company after the transaction.
 
     Any outside Director who is eligible for a retirement benefit under the
Retirement Plan for Directors will receive such benefit (regardless of whether
he has met the other eligibility requirements of the Plan) in the event he
ceases to be a Director following a Change of Control. The balance of a
Director's account in the Director's Fees Deferral Plan will be distributed to
him in a lump sum in the event his service as a Director is terminated within
three years following a Change of Control, regardless of any other elections he
may have made with respect to the timing and manner of payment of amounts in his
account. Also, all shares of restricted stock granted under the Restricted Stock
Plan for Directors will vest immediately upon a Change of Control.
 
     Upon the occurrence of a Change of Control, all outstanding shares of
restricted stock under the Executive Award Plan will immediately vest, and all
outstanding options (and tandem SARs) under the Executive Award Plan held by
then-current employees will become immediately exercisable. Also, upon the
occurrence of a Change of Control, the participant will receive 100% of his
bonus opportunities under the Performance Award Plan and the Cash Bonus Plan.
Any officer of the Company or certain of its subsidiaries who at the time of a
Change of Control is not vested under the Retirement Plan will be provided with
a vested benefit under the Supplemental Benefit Plan equal to the benefit that
would have been payable under the Retirement Plan if his actual years of service
had been sufficient for vesting. Following a Change of Control, a participant's
Savings Plan account under the Supplemental Benefit Plan will be distributed
within 30 days of his termination of employment.
 
     The named executive officers have Limited SARs in tandem with all
outstanding options under the Executive Award Plan. Upon exercise of a Limited
SAR or an SAR within 60 days after an SAR Change of Control (as defined below),
the executive officer would receive the difference between (1) the greater of
(a) the highest price of the Company's Common Stock during the 60-day period
before exercise of the Limited SAR or SAR and (b) the highest price paid for a
share of the Company's Common Stock by an acquiring person during the 60-day
period before the SAR Change of Control and (2) the exercise price of the
Limited SAR or SAR. An "SAR Change of Control" is deemed to have occurred if (1)
any person or group acquires (or obtains the right to acquire) beneficial
ownership of 35% or more of the Company's voting securities, (2) there is a
change in the composition of a majority of the Company's Board of Directors
within any period of three consecutive years which change was not approved by a
majority of the Board as constituted immediately prior to the commencement of
such three-year period or (3) at any meeting of stockholders of the Company
called for the purpose of electing Directors the entire slate nominated by the
Board of Directors fails to be elected.
 
EXECUTIVE SEVERANCE AGREEMENTS
 
     The Company has Executive Severance Agreements with Messrs. Kuehn, Bates,
Moylan, Rubright, Russell and Smith. These agreements provide that if the
executive officer's employment is terminated either (1) within three years after
a Change of Control (as defined above), either (a) by the Company for reasons
other than dishonesty, conviction of a felony or willful unauthorized disclosure
of confidential information or other than as a consequence of death, disability
or retirement at normal retirement age or (b) by the executive officer for
reasons relating to a diminution of responsibilities or compensation or
relocation requiring a change in residence or a significant increase in travel,
or (2) by the executive officer for any reason during the 30-day period
immediately following the first anniversary of the Change of Control, he will
receive: (1) a lump sum payment equal to three times his highest earnings
(defined to include those items described as covered compensation under the
Retirement Plan) during any 12-month period during the three years preceding the
termination (such lump sum payment to be reduced pro rata to the extent there
 
                                       20
<PAGE>   22
 
are less than 36 months until the officer reaches normal retirement age); (2)
life, medical, and accident and disability insurance as provided in the
Company's insurance programs or, in certain circumstances, substantially
equivalent insurance to be provided by the Company for a period of 36 months
after termination of employment (or until normal retirement age, whichever is
sooner); and (3) for an executive officer who has reached age 50 and is not
otherwise entitled to an early retirement benefit under the terms of a qualified
retirement plan of the Company or its subsidiaries, an annual benefit equal to
the amount such officer would have received had he been entitled to an early
retirement benefit (reduced by any benefits payable to him under such retirement
plan and the Supplemental Benefit Plan), and a survivors benefit with respect to
such early retirement benefit. The Executive Severance Agreements also provide
that if the executive officer receives payments that would be subject to the tax
imposed by Section 4999 of the Internal Revenue Code, the executive shall be
entitled to receive an additional payment in an amount necessary to put the
executive officer in the same after-tax position as if such tax had not been
imposed. Assuming that the executive officers terminated employment on January
31, 1998, in a manner entitling them to benefits under the Executive Severance
Agreements, the respective executive officers would receive the following lump
sum cash payments pursuant to item (1) above and the following annual retirement
benefits pursuant to item (3) above: Mr. Kuehn, $4,711,500 in cash and $0 in
retirement benefits; Mr. Bates, $1,265,625 in cash and $0 in retirement
benefits; Mr. Moylan, $1,347,000 in cash and $0 in retirement benefits; Mr.
Rubright, $1,523,850 in cash and $7,039 in retirement benefits; Mr. Russell,
$1,901,142 in cash and $0 in retirement benefits; and Mr. Smith, $1,749,900 in
cash and $71,993 in retirement benefits.
 
     The Executive Severance Agreements provide that the executive officer may
not voluntarily leave the employ of the Company if a third party attempts to
effect a Change of Control until such third party abandons such attempt or a
Change of Control has occurred. The Agreements renew automatically for one-year
terms unless terminated at the end of any term by the Board of Directors. The
Agreements shall also terminate if the Executive Compensation Committee
determines that the executive officer is no longer a key employee, unless a
Change of Control is threatened at the time or has occurred within the past
three years.
 
                      ELECTION OF AUDITOR (PROPOSAL NO. 1)
 
     Ernst & Young LLP has been nominated for election as Auditor of the
Company. The Restated Certificate of Incorporation provides that no other person
shall be eligible for election as Auditor unless notice of intention to nominate
such person has been given to the Company not less than ten days before the
Annual Meeting.
 
     A representative of Ernst & Young LLP will be present at the Annual Meeting
with the opportunity to make a statement if such representative desires to do so
and will be available to respond to appropriate questions.
 
     THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" THE ELECTION OF ERNST &
YOUNG LLP AS AUDITOR (PROPOSAL NO. 1).
 
                                 OTHER MATTERS
 
PROPOSALS OF STOCKHOLDERS
 
     STOCKHOLDER PROPOSALS IN THE COMPANY'S PROXY STATEMENT.  In order for
proposals by stockholders to be considered for inclusion in the proxy statement
and form of proxy relating to the 1999 Annual Meeting of Stockholders, such
proposals must be received at the principal executive offices of the Company,
AmSouth-Sonat Tower, Birmingham, Alabama 35203, by no later than November 24,
1998.
 
                                       21
<PAGE>   23
 
     STOCKHOLDER PROPOSALS TO BE PRESENTED AT MEETINGS.  A stockholder who
desires to propose any business at an annual meeting of stockholders must give
the Secretary of the Company written notice which is received not later than the
close of business on the 60th day nor earlier than the close of business on the
90th day before the first anniversary of the preceding year's annual meeting
(the "Notice Deadline"). (Special notice provisions apply if the date of the
annual meeting is more than 30 days before or more than 60 days after such
anniversary date.) Adjournment of an annual meeting shall not commence a new
Notice Deadline. The stockholder's notice must set forth (a) a brief description
of the business desired to be brought before the meeting, the reasons for
conducting such business at the meeting and the beneficial owner, if any, on
whose behalf the proposal is made; (b) a representation that the stockholder is
a holder of record of stock of the Company entitled to vote at such meeting (or
if the record date for such meeting is subsequent to the date required for such
stockholder notice, a representation that the stockholder is a holder of record
at the time of such notice and intends to be a holder of record on the record
date for such meeting) and intends to appear in person or by proxy at such
meeting to propose such business; (c) any material interest of the stockholder
in such business; and (d) for both the stockholder giving notice and the
beneficial owner, if any, on whose behalf the proposal is made (1) the name and
address of such stockholder and beneficial owner and (2) the class and number of
shares owned beneficially and of record by such stockholder and beneficial
owner.
 
     STOCKHOLDER NOMINATIONS FOR DIRECTORS.  A stockholder who desires to
nominate Directors at a meeting of stockholders must give the Secretary of the
Company written notice within the Notice Deadline (for an annual meeting) or,
for a special meeting at which directors are to be elected pursuant to the
Company's notice of meeting, not earlier than the close of business on the 90th
day before such special meeting and not later than the close of business on the
later of the 60th day before such special meeting or the 10th day after the date
public announcement is made of the date of the special meeting and the nominees
proposed by the Board of Directors to be elected at such meeting. The
stockholder's notice must set forth (a) the name and address of the stockholder
giving the notice and of the beneficial owner, if any, on whose behalf the
nominations are made; (b) the class and number of shares owned beneficially and
of record by such stockholder and such beneficial owner; (c) a representation
that the stockholder is a holder of record of stock of the Company entitled to
vote at such meeting (or if the record date for such meeting is subsequent to
the date required for such stockholder notice, a representation that the
stockholder is a holder of record at the time of such notice and intends to be a
holder of record on the record date for such meeting) and intends to appear in
person or by proxy at the meeting to nominate the person or persons specified in
the notice; (d) a description of all arrangements or understandings between the
stockholder or beneficial owner and each nominee and any other person or persons
(naming such person or persons) pursuant to which the nomination or nominations
are to be made; (e) such other information regarding each nominee proposed by
such stockholder as would have been required to be disclosed in solicitations of
proxies for election of directors pursuant to the rules of the Securities and
Exchange Commission; and (f) the consent of each nominee to be named in the
proxy statement as a nominee and to serve as a Director of the Company if so
elected.
 
     The Chairman of the meeting may refuse to transact any business or to
acknowledge the nomination of any person if a stockholder has failed to comply
with the foregoing procedures.
 
     A copy of the Company's By-Laws may be obtained from the Company upon
written request to the Company at its Birmingham, Alabama office.
 
VOTING AT THE ANNUAL MEETING
 
     The presence, in person or by proxy, of the holders of a majority of the
Company's Common Stock is necessary to constitute a quorum at the Annual Meeting
or any adjournment thereof.
 
     The vote required for the election of Directors and the approval of the
other matters scheduled for a vote at the Annual Meeting is controlled by the
provisions of the Company's Charter and By-
 
                                       22
<PAGE>   24
 
Laws and the Delaware General Corporation Law. Directors are elected by a
plurality vote. Approval of Proposal No. 1 would require a plurality vote.
Abstentions and broker "non-votes" (shares not voted on a matter because a
nominee holding shares for a beneficial owner neither receives voting
instructions from such beneficial owner nor has discretionary voting power with
respect thereto) shall not have an effect on the vote at the Annual Meeting. The
vote will be tabulated by an independent tabulator and the results of such vote
will be certified by independent inspectors of election.
 
SOLICITATION OF PROXIES
 
     The Company will bear the costs of solicitation of proxies. Officers and
regular employees of the Company may solicit proxies by mail, telephone,
telegraph and personal interview. In addition, the Company has retained D. F.
King & Co., Inc. to assist in the solicitation of proxies, and anticipates that
the fees that it will incur for this service, excluding out-of-pocket expenses,
will not exceed $10,000. Arrangements will be made with brokerage houses and
with other custodians, nominees and fiduciaries to forward proxy soliciting
material to beneficial owners. The Company will reimburse persons holding stock
for others in their names or in those of their nominees for their reasonable
out-of-pocket expenses in sending proxy material to their principals and
obtaining their proxies.
                         ------------------------------
 
     The information provided under the headings "Report of the Executive
Compensation Committee" and "Performance Graph" above shall not be deemed to be
"soliciting material" or to be "filed" with the Securities and Exchange
Commission or subject to Regulations 14A or 14C, other than as provided in Item
402 of Regulation S-K, or to the liabilities of Section 18 of the Securities
Exchange Act of 1934 and, unless specific reference is made therein to such
headings, shall not be incorporated by reference into any filing under the
Securities Act of 1933 or the Securities Exchange Act of 1934.
 
     The Company is not aware that any matters other than those mentioned above
will be presented for action at the 1998 Annual Meeting, but if any other
matters do properly come before the meeting, the persons named as proxies will
vote upon such matters in accordance with their best judgment.
 
     Please complete, sign, date and return the enclosed proxy card promptly.
 
                                          SONAT INC.
 
                                          /s/ Beverley T. Krannich
                                          Beverley T. Krannich
                                            SECRETARY
Birmingham, Alabama
March 21, 1998
 
                                       23

<PAGE>   1
                                                                    EXHIBIT 23.1



                         CONSENT OF INDEPENDENT AUDITORS

We consent to the incorporation by reference in (i) the Registration Statement
(Form S-8, No. 33-64367) pertaining to the Sonat Inc. Executive Award Plan and
the related Prospectus and (ii) the Registration Statement (Form S-8, No.
33-50142) pertaining to the Sonat Savings Plan and the related Prospectus of our
report dated January 16, 1998, with respect to the consolidated financial
statements of Sonat Inc. included in the Annual Report (Form 10-K) for the year
ended December 31, 1997.

                                        ERNST & YOUNG LLP

Birmingham, Alabama
March 23, 1998

<PAGE>   1
                                                                    EXHIBIT 23.2





                   CONSENT OF INDEPENDENT PETROLEUM ENGINEERS


We hereby consent to the references to us and to the use of the information
derived from our reserve report on the interests of Sonat Exploration GOM Inc.
(formerly Zilkha Energy Company) ("Sonat GOM"), dated February 27, 1998,
relating to the estimated quantities of certain of Sonat GOM's proved reserves,
in the Sonat Inc. Annual Report on Form 10-K for 1997 under the caption "Sonat
Exploration GOM Inc." and to the incorporation by reference of such references
and information in the Sonat Inc. Registration Statements on Form S-8 (No.
33-64367 and No. 33-50142). We also consent to our being named as experts for
purposes of such Registration Statements.

                                    WILLIAM M. COBB & ASSOCIATES, INC.



                                    By: /s/ Frank J. Marek
                                       -----------------------------------------

Dallas, Texas
March 23, 1998

<PAGE>   1
                                                                      EXHIBIT 24

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.



                                        /s/ William O. Bourke
                                       -----------------------------------------
                                        William O. Bourke


<PAGE>   2

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, an officer and
director of Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.;
Thomas W. Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C.
Griffin, and each of them, his true and lawful attorneys to execute in his name
(whether on behalf of Sonat Inc. or as an Officer or director of Sonat Inc.) the
Sonat Inc. Annual Report on Form 10-K for the fiscal year ended December 31,
1997, and any and all amendments thereto to be filed with the Securities and
Exchange Commission pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934 and to file the same, with all exhibits thereto, and any other
documents in connection therewith, with the Securities and Exchange Commission.
The undersigned does hereby ratify and confirm all that said attorneys and
agents, and each of them, shall do or cause to be done by virtue hereof. Each of
such attorneys shall have and may exercise all powers to act hereunder with or
without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Ronald L. Kuehn, Jr.
                                       -----------------------------------------
                                        Ronald L. Kuehn, Jr.


<PAGE>   3

                                    POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Robert J. Lanigan
                                       -----------------------------------------
                                        Robert J. Lanigan


<PAGE>   4

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Max L. Lukens
                                       -----------------------------------------
                                        Max L. Lukens


<PAGE>   5

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
28th day of February, 1998.

                                        /s/ Charles  Marshall
                                       -----------------------------------------
                                        Charles Marshall


<PAGE>   6

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Benjamin F. Payton
                                       -----------------------------------------
                                        Benjamin F. Payton


<PAGE>   7

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ John J. Phelan, Jr.
                                       -----------------------------------------
                                        John J. Phelan, Jr.


<PAGE>   8

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Jerome J. Richardson
                                       -----------------------------------------
                                        Jerome J. Richardson


<PAGE>   9

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, an officer and
director of Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.;
Thomas W. Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C.
Griffin, and each of them, his true and lawful attorneys to execute in his name
(whether on behalf of Sonat Inc. or as an Officer or director of Sonat Inc.) the
Sonat Inc. Annual Report on Form 10-K for the fiscal year ended December 31,
1997, and any and all amendments thereto to be filed with the Securities and
Exchange Commission pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934 and to file the same, with all exhibits thereto, and any other
documents in connection therewith, with the Securities and Exchange Commission.
The undersigned does hereby ratify and confirm all that said attorneys and
agents, and each of them, shall do or cause to be done by virtue hereof. Each of
such attorneys shall have and may exercise all powers to act hereunder with or
without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Donald G. Russell
                                       -----------------------------------------
                                        Donald G. Russell


<PAGE>   10

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed her name hereto as of the
26th day of February, 1998.

                                        /s/ Adrian M. Tocklin
                                       -----------------------------------------
                                        Adrian M. Tocklin


<PAGE>   11

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ James B. Williams
                                       -----------------------------------------
                                        James B. Williams


<PAGE>   12

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Joe B. Wyatt
                                       -----------------------------------------
                                        Joe B. Wyatt


<PAGE>   13

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Selim K. Zilkha
                                       -----------------------------------------
                                        Selim K. Zilkha


<PAGE>   14

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a director of
Sonat Inc., does hereby constitute and appoint Ronald L. Kuehn, Jr.; Thomas W.
Barker, Jr.; James E. Moylan, Jr.; William A. Smith; and John C. Griffin, and
each of them, his true and lawful attorneys to execute in his name (whether on
behalf of Sonat Inc. or as a director of Sonat Inc.) the Sonat Inc. Annual
Report on Form 10-K for the fiscal year ended December 31, 1997, and any and all
amendments thereto to be filed with the Securities and Exchange Commission
pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission. The undersigned does
hereby ratify and confirm all that said attorneys and agents, and each of them,
shall do or cause to be done by virtue hereof. Each of such attorneys shall have
and may exercise all powers to act hereunder with or without the others.

        IN WITNESS WHEREOF, the undersigned has signed his name hereto as of the
26th day of February, 1998.

                                        /s/ Michael S. Zilkha
                                       -----------------------------------------
                                        Michael S. Zilkha

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000 
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
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<SECURITIES>                                         0
<RECEIVABLES>                                  594,972
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<CURRENT-ASSETS>                               937,725
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<CURRENT-LIABILITIES>                        1,250,089
<BONDS>                                      1,042,734
                                0
                                          0
<COMMON>                                        87,227
<OTHER-SE>                                   1,548,193
<TOTAL-LIABILITY-AND-EQUITY>                 4,431,514
<SALES>                                      3,694,942
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<CGS>                                        3,174,060
<TOTAL-COSTS>                                3,355,171
<OTHER-EXPENSES>                               326,014
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              89,956
<INCOME-PRETAX>                                256,457
<INCOME-TAX>                                    80,537
<INCOME-CONTINUING>                            175,920
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   175,920
<EPS-PRIMARY>                                     2.05
<EPS-DILUTED>                                     2.01
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          29,639
<SECURITIES>                                         0
<RECEIVABLES>                                  577,021
<ALLOWANCES>                                         0
<INVENTORY>                                     30,500
<CURRENT-ASSETS>                               693,290
<PP&E>                                       5,084,283
<DEPRECIATION>                               2,650,419
<TOTAL-ASSETS>                               3,774,659
<CURRENT-LIABILITIES>                          848,837
<BONDS>                                        872,255
                                0
                                          0
<COMMON>                                        87,233
<OTHER-SE>                                   1,497,131
<TOTAL-LIABILITY-AND-EQUITY>                 3,774,659
<SALES>                                      2,556,822
<TOTAL-REVENUES>                             3,039,014
<CGS>                                        2,038,846
<TOTAL-COSTS>                                2,202,583
<OTHER-EXPENSES>                               288,192
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              86,946
<INCOME-PRETAX>                                294,304
<INCOME-TAX>                                    93,115
<INCOME-CONTINUING>                            201,189
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   201,189
<EPS-PRIMARY>                                     2.33
<EPS-DILUTED>                                     2.30
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               DEC-31-1995
<CASH>                                          37,289
<SECURITIES>                                         0
<RECEIVABLES>                                  327,697
<ALLOWANCES>                                         0
<INVENTORY>                                     23,956
<CURRENT-ASSETS>                               494,431
<PP&E>                                       4,822,879
<DEPRECIATION>                               2,545,320
<TOTAL-ASSETS>                               3,511,441
<CURRENT-LIABILITIES>                          640,125
<BONDS>                                        770,313
                                0
                                          0
<COMMON>                                        87,244
<OTHER-SE>                                   1,395,398
<TOTAL-LIABILITY-AND-EQUITY>                 3,511,441
<SALES>                                      1,236,953
<TOTAL-REVENUES>                             1,754,341
<CGS>                                          913,054
<TOTAL-COSTS>                                1,084,939
<OTHER-EXPENSES>                               298,714
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              96,257
<INCOME-PRETAX>                                287,881
<INCOME-TAX>                                    94,993
<INCOME-CONTINUING>                            192,888
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   192,888
<EPS-PRIMARY>                                     2.24
<EPS-DILUTED>                                     2.21
        

</TABLE>


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