SONAT INC
424B5, 1995-06-07
NATURAL GAS TRANSMISSION
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<PAGE>
            PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JULY 27, 1993

                                  $200,000,000

                                   SONAT INC.
                         6 7/8% NOTES DUE JUNE 1, 2005

                                  -----------

    Interest  on the Notes is  payable semiannually on June  1 and December 1 of
each year, commencing December 1, 1995. The  Notes may not be redeemed prior  to
maturity.  The Notes  do not  provide for  any sinking  fund. The  Notes will be
represented by one or more global Notes registered in the name of the nominee of
The Depository Trust Company. Beneficial interests  in the global Notes will  be
shown  on,  and  transfers  thereof  will  be  effected  only  through,  records
maintained by DTC  and its participants.  Except as described  herein, Notes  in
definitive form will not be issued. See "Description of Notes".

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

THESE  SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
    SECURITIES  AND EXCHANGE COMMISSION OR  ANY STATE SECURITIES COMMISSION
     PASSED UPON THE ACCURACY OR  ADEQUACY OF THIS PROSPECTUS  SUPPLEMENT
       OR  THE PROSPECTUS TO WHICH IT RELATES. ANY REPRESENTATION TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.

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

<TABLE>
<CAPTION>
                                               INITIAL PUBLIC          UNDERWRITING            PROCEEDS TO
                                              OFFERING PRICE(1)         DISCOUNT(2)           COMPANY(1)(3)
                                            ---------------------  ---------------------  ---------------------
<S>                                         <C>                    <C>                    <C>
Per Note..................................         99.577%                 .650%                 98.927%
Total.....................................      $199,154,000            $1,300,000            $197,854,000
<FN>
- --------------
(1)  Plus accrued interest from June 1, 1995.

(2)  The Company  has  agreed  to indemnify  the  Underwriters  against  certain
     liabilities, including liabilities under the Securities Act of 1933.

(3)  Before deducting expenses payable by the Company, estimated to be $120,000.
</TABLE>

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

    The  Notes are offered  severally by the  Underwriters, as specified herein,
subject to receipt and acceptance by them  and subject to their right to  reject
any  order in whole or in part. It is  expected that the Notes will be ready for
delivery in book-entry form only through the facilities of DTC in New York,  New
York, on or about June 12, 1995.

GOLDMAN, SACHS & CO.

                              MERRILL LYNCH & CO.

                                                          CHASE SECURITIES, INC.
                                   ---------

            The date of this Prospectus Supplement is June 6, 1995.
<PAGE>
    IN  CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE  MARKET PRICE OF THE NOTES  OFFERED
HEREBY  AT A LEVEL ABOVE THAT WHICH  MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET.
SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

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

                                  THE COMPANY

    The Company,  a Delaware  corporation organized  in 1973,  is a  diversified
energy  holding  company.  It  is  engaged  through  Sonat  Exploration  Company
("Exploration") in domestic oil and  natural gas exploration and production  and
through  Southern Natural Gas Company  ("Southern"), Citrus Corp. ("Citrus") and
Sonat Energy Services Company ("Energy  Services") in the transmission,  storage
and marketing of natural gas.

    Exploration,  which is one of the  largest independent natural gas producers
in the United States, operates primarily in Texas, Oklahoma, Louisiana, Arkansas
and the  Gulf of  Mexico. As  of  March 31,  1995, it  held proved  reserves  of
approximately 1.8 trillion cubic feet of natural gas equivalent.

    Southern  is a major  transporter of natural gas  to the southeastern United
States. Its natural gas transmission 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.  The Company  and Enron  Corp. each  owns a
one-half interest in  Citrus, a holding  company that owns  100% 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.   Energy   Services'  largest   subsidiary,  Sonat   Marketing  Company
("Marketing"), sells natural gas throughout much of the United States. In  1993,
Marketing  assumed responsibility  for the sale  of almost  all of Exploration's
natural gas production and at  year-end 1994 was one  of the 20 largest  natural
gas  marketers in the United States. In  May 1995, the Company announced that it
had entered  into a  letter of  intent with  Atlanta Gas  Light Company  ("AGL")
pursuant to which AGL would acquire 35% of Marketing for a purchase price of $32
million.

    The  Company owns  approximately 11.3 million  of the  outstanding shares of
Sonat Offshore  Drilling  Inc.  ("Sonat  Offshore"), which  at  March  31,  1995
represented  approximately 40% of such outstanding  shares. Sonat Offshore is in
the offshore contract drilling business.

                                USE OF PROCEEDS

    The net proceeds from the  sale of the Notes will  be used to repay  amounts
borrowed  by the  Company under its  commercial paper program  and under certain
short-term lines  of credit  and revolving  credit agreements  with banks,  with
interest   rates  ranging  from  approximately  6.00%  to  6.30%,  and,  pending
application of  the  net  proceeds  for  such  purposes,  will  be  invested  in
short-term investments.

                                      S-2
<PAGE>
                              DESCRIPTION OF NOTES

    THE FOLLOWING DESCRIPTION OF THE TERMS OF THE NOTES OFFERED HEREBY (REFERRED
TO  IN THE PROSPECTUS AS THE "OFFERED  DEBT SECURITIES") SUPPLEMENTS, AND TO THE
EXTENT INCONSISTENT THEREWITH REPLACES, INSOFAR  AS SUCH DESCRIPTION RELATES  TO
THE  NOTES, THE  DESCRIPTION OF  THE OFFERED  DEBT SECURITIES  SET FORTH  IN THE
PROSPECTUS, TO WHICH DESCRIPTION REFERENCE IS HEREBY MADE.

    The Notes are to  be issued under  an Indenture, dated as  of June 1,  1986,
between  the Company and Chemical Bank,  as successor by merger to Manufacturers
Hanover Trust  Company, as  supplemented by  the First  Supplemental  Indenture,
dated as of June 1, 1995, between the Company and Chemical Bank, as Trustee (the
"Trustee").

    The  Notes will  be limited to  $200,000,000 aggregate  principal amount and
will mature on June 1, 2005. The Notes will bear interest at the rate per  annum
shown on the cover page of this Prospectus Supplement from June 1, 1995, or from
the  most  recent Interest  Payment  Date to  which  interest has  been  paid or
provided for,  payable semi-annually  on June  1 and  December 1  of each  year,
commencing  December  1,  1995, to  the  person in  whose  name a  Note  (or any
predecessor Note)  is registered  at the  close of  business on  the May  15  or
November 15, as the case may be, next preceding such Interest Payment Date.

    The  Notes will not be redeemable prior to maturity and will not be entitled
to the benefit of any sinking fund.

    The Notes are  subject to  defeasance and covenant  defeasance as  described
under  "Description of Debt Securities -- Defeasance and Covenant Defeasance" in
the Prospectus. As more fully discussed therein, it is likely that a  defeasance
of  the Notes by the Company  would result in a taxable  event to the holders of
the Notes under current Federal income tax law.

BOOK-ENTRY SYSTEM

    The Notes will be issued in the form of one or more fully registered  global
notes  (collectively, the "Global  Notes"), which will be  deposited with, or on
behalf of, The Depository Trust Company,  New York, New York (the  "Depositary")
and  registered in  the name  of the Depositary's  nominee. Except  as set forth
below, the Global Notes may  be transferred, in whole and  not in part, only  to
the Depositary or another nominee of the Depositary.

    The  Depositary  has advised  the Company  as follows:  The Depositary  is a
limited-purpose trust company organized under the laws of the State of New York,
a "banking  organization" within  the meaning  of the  New York  Banking Law,  a
member  of  the  Federal Reserve  System,  a "clearing  corporation"  within the
meaning of the New York Uniform Commercial Code and "clearing agency" registered
pursuant to the  provisions of  Section 17A of  the Securities  Exchange Act  of
1934,  as amended. The Depositary was created to hold securities of institutions
that have accounts with  the Depositary or its  nominee ("participants") and  to
facilitate  the clearance  and settlement  of securities  transactions among its
participants  in  such  securities  through  electronic  book-entry  changes  in
accounts of the participants, thereby eliminating the need for physical movement
of  securities  certificates. The  Depositary's participants  include securities
brokers and  dealers  (including  the  Underwriters),  banks,  trust  companies,
clearing  corporations  and certain  other organizations,  some of  whom (and/or
their representatives) own the Depositary. Access to the Depositary's book-entry
system is also  available to others  such as banks,  brokers, dealers and  trust
companies  that  clear  through  or maintain  a  custodial  relationship  with a
participant, either  directly  or indirectly.  The  Depositary agrees  with  and
represents  to its participants that it will administer its book-entry system in
accordance with its rules and bylaws and requirements of law.

    Upon the issuance of  the Global Notes, the  Depositary will credit, on  its
book-entry registration and transfer system, the respective principal amounts of
the  Notes represented by such Global Notes to the accounts of participants. The
accounts to be credited  shall be designated by  the Underwriters. Ownership  of
beneficial  interests in  the Global  Notes will  be limited  to participants or
persons that may hold interests through participants. Ownership of interests  in
the Global Notes will be shown on, and the

                                      S-3
<PAGE>
transfer  of those  ownership interests will  be effected  only through, records
maintained by the Depositary (with respect to participants' interests) and  such
participants  (with respect to  the owners of beneficial  interest in the Global
Notes through such  participants). The  laws of some  jurisdictions may  require
that  certain purchasers of securities take physical delivery of such securities
in definitive form.  Such limits  and laws may  impair the  ability to  transfer
beneficial interests in the Global Notes.

    So  long as  the Depositary,  or its nominee,  is the  registered holder and
owner of the Global Notes, the Depositary  or such nominee, as the case may  be,
will  be  considered the  sole owner  and holder  of the  related Notes  for all
purposes of such Notes and for all  purposes under the Indenture. Except as  set
forth  below, owners  of beneficial  interests in the  Global Notes  will not be
entitled to have the Notes represented by such Global Notes registered in  their
names,  will  not  receive  or  be  entitled  to  receive  physical  delivery of
certificated Notes  in definitive  form and  will not  be considered  to be  the
owners  or  holders  of any  Notes  under  the Indenture  or  the  Global Notes.
Accordingly, each person owning a beneficial  interest in the Global Notes  must
rely  on  the  procedures  of  the  Depositary and,  if  such  person  is  not a
participant, on the procedures of the participant through which such person owns
its interest, to exercise any rights of a holder of Notes under the Indenture or
the Global Notes. The Company understands that under existing industry practice,
in the event the Company requests any action of holders of Notes or an owner  of
a  beneficial interest in the  Global Notes desires to  take any action that the
Depositary, as  the  holder  of the  Global  Notes,  is entitled  to  take,  the
Depositary  would authorize the  participants to take such  action, and that the
participants would authorize beneficial owners owning through such  participants
to  take such action or would otherwise  act upon the instructions of beneficial
owners owning through them.

    Payment of principal (and premium, if any) and interest on Notes represented
by the Global Notes registered in the name  of or held by the Depositary or  its
nominee  will be made to the  Depositary or its nominee, as  the case may be, as
the registered owner and holder of the Global Notes.

    The Company expects  that the  Depositary, upon  receipt of  any payment  of
principal  or interest in  respect of the Global  Notes, will credit immediately
participants' accounts with payment in amounts proportionate to their respective
beneficial interests in the principal amount of the Global Notes as shown on the
records  of  the  Depositary.  The   Company  also  expects  that  payments   by
participants  to owners of beneficial interests in the Global Notes held through
such participants  will  be  governed by  standing  instructions  and  customary
practices,  as is the case with securities held for the accounts of customers in
bearer form or registered  in "street name", and  will be the responsibility  of
such  participants. None of the Company, the Trustee or any agent of the Company
or the Trustee will have any responsibility  or liability for any aspect of  the
records  relating  to,  or payments  made  on account  of,  beneficial ownership
interests in the Global Notes for  any Notes or for maintaining, supervising  or
reviewing any records relating to such beneficial ownership interests or for any
other  aspect of the relationship between the Depositary and its participants or
the  relationship  between  such  participants  and  the  owners  of  beneficial
interests in the Global Notes owning through such participants.

    Unless  and until they  are exchanged in  whole or in  part for certificated
Notes in definitive form, the  Global Notes may not  be transferred except as  a
whole  by the Depositary to a nominee of such Depositary or by a nominee of such
Depositary to such Depositary or another nominee of such Depositary.

    The Notes represented by the Global Notes are exchangeable for  certificated
Notes in definitive registered form of like tenor as such Notes in denominations
of  $1,000 and in any greater amount that is an integral multiple thereof if (i)
the Depositary notifies the Company that  it is unwilling or unable to  continue
as Depositary for the Global Notes or if at any time the Depositary ceases to be
a  clearing  agency registered  under the  Securities Exchange  Act of  1934, as
amended, (ii) the Company in its discretion  at any time determines not to  have
all  of  the Notes  represented by  the  Global Notes  and notifies  the Trustee
thereof or (iii) an Event  of Default with respect  to the Notes represented  by
such

                                      S-4
<PAGE>
Global  Notes has  occurred and is  continuing. Any Notes  that are exchangeable
pursuant to  the  preceding sentence  are  exchangeable for  certificated  Notes
issuable  in  authorized  denominations  and registered  in  such  names  as the
Depositary shall direct.  Subject to  the foregoing,  the Global  Notes are  not
exchangeable  except for  a Global  Note or Global  Notes of  the same aggregate
denominations to be registered in the name of the Depositary or its nominee.

                                  UNDERWRITING

    Subject to the terms and conditions set forth in the Underwriting Agreement,
the Company has agreed to sell to each of the Underwriters named below, and each
of the Underwriters has  severally agreed to purchase,  the principal amount  of
the Notes set forth opposite its name below:

<TABLE>
<CAPTION>
                                                                             PRINCIPAL AMOUNT
                               UNDERWRITING                                      OF NOTES
- ---------------------------------------------------------------------------  -----------------
<S>                                                                          <C>
Goldman, Sachs & Co. ......................................................   $    66,700,000
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated.....................................................        66,650,000
                                                                             -----------------
Chase Securities, Inc......................................................        66,650,000
                                                                             -----------------
    Total..................................................................   $   200,000,000
                                                                             -----------------
                                                                             -----------------
</TABLE>

    Under   the  terms  and  conditions   of  the  Underwriting  Agreement,  the
Underwriters are committed to take and pay for all the Notes, if any are taken.

    The Underwriters  propose to  offer the  Notes in  part directly  to  retail
purchasers  at the initial public offering price  set forth on the cover page of
this Prospectus Supplement, and  in part to certain  securities dealers at  such
price  less  a concession  of .40%  of the  principal amount  of the  Notes. The
Underwriters may allow, and such dealers may reallow, a concession not to exceed
 .25% of the principal amount of the Notes to certain brokers and dealers.  After
the  Notes are  released for sale  to the  public, the offering  price and other
selling terms may from time to time be varied by the Underwriters.

    The Company has agreed to indemnify the several Underwriters against certain
liabilities, including liabilities under the Securities Act of 1933, as amended.

    The Notes are a new issue of securities with no established trading  market.
The  Company has  been advised by  the Underwriters  that they intend  to make a
market in the Notes, but are under no obligation to do so and such market making
may be terminated at any  time without notice. No assurance  can be given as  to
the liquidity of the trading market for the Notes.

    In  the  ordinary  course  of  their  respective  businesses,  each  of  the
Underwriters and their affiliates have provided, and may in the future  provide,
investment  banking and/or commercial banking  services for the Company. William
O. Bourke and John J.  Phelan, directors of the  Company, are also directors  of
the  parent corporation of  Merrill Lynch, Pierce,  Fenner & Smith Incorporated,
one of the Underwriters. The Chase  Manhattan Bank, N.A., an affiliate of  Chase
Securities,  Inc., one of  the Underwriters, is  a co-agent bank  for one of the
Company's bank credit  agreements. More than  10% of the  net proceeds from  the
offering  of the  Notes may  be used  to repay  indebtedness owing  to The Chase
Manhattan Bank, N.A. under such credit agreement. Accordingly, this offering  is
being  made in accordance with  Section 44(c)(8) of Article  III of the Rules of
Fair Practice of the National Association of Securities Dealers, Inc.

                             VALIDITY OF THE NOTES

    The validity of the Notes  will be passed upon for  the Company by James  A.
Rubright, General Counsel of the Company, and for the Underwriters by Sullivan &
Cromwell,  New York, New  York. Mr. Rubright  owns less than  one percent of the
Company's Common Stock. Mr.  Rubright will rely upon  the opinion of Sullivan  &
Cromwell as to certain matters of New York law.

                                      S-5
<PAGE>
                                    EXPERTS

    The  consolidated  financial  statements  of  Sonat  Inc.  and  subsidiaries
appearing in Sonat's Annual Report (Form  10-K) for the year ended December  31,
1994  have been audited by Ernst & Young LLP, independent auditors, as set forth
in their report thereon included therein  and incorporated in the Prospectus  by
reference.  Such consolidated  financial statements  are incorporated  herein by
reference in reliance upon such report given upon the authority of such firm  as
experts in accounting and auditing.

                                      S-6
<PAGE>
                                   SONAT INC.
                                DEBT SECURITIES
                                ----------------

    Sonat  Inc. (the "Company") may  offer from time to  time up to $500,000,000
aggregate principal amount  or the equivalent  thereof in one  or more  currency
units  of its debt securities (the "Debt  Securities") in one or more series, at
prices and on terms to be determined at  the time of sale. As used herein,  Debt
Securities  shall include securities denominated in United States dollars or, at
the option  of  the  Company  if  so  specified  in  the  applicable  Prospectus
Supplement,  in  any other  currency or  in composite  currencies or  in amounts
determined by  reference  to  an  index.  The  specific  designation,  aggregate
principal  amount, authorized denominations, purchase  price, maturity, rate and
time of payment of  any interest, any redemption  terms or other specific  terms
and  any listing on a  securities exchange of the  Debt Securities in respect of
which this Prospectus  is being  delivered ("Offered Debt  Securities") are  set
forth  in  the  accompanying  prospectus  supplement  ("Prospectus Supplement"),
together with the terms of offering of the Offered Debt Securities.

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

 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
      EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
    SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
           REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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

    The Company  may sell  Debt  Securities to  or  through dealers,  acting  as
principals  for their own accounts ("underwriters")  or as agents ("agents"), or
directly to  other  purchasers.  See  "Plan  of  Distribution."  The  Prospectus
Supplement  sets  forth  the  names  of  such  underwriters  or  agents  and any
applicable commissions or discounts. The net  proceeds to the Company from  such
sale are also set forth in the Prospectus Supplement.

                 The date of this Prospectus is July 27, 1993.
<PAGE>
    NO  DEALER, SALESMAN  OR ANY  OTHER PERSON HAS  BEEN AUTHORIZED  TO GIVE ANY
INFORMATION OR  TO  MAKE  ANY  REPRESENTATIONS OTHER  THAN  THOSE  CONTAINED  OR
INCORPORATED  BY REFERENCE IN THIS PROSPECTUS OR THE PROSPECTUS SUPPLEMENT, AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY  THE COMPANY OR BY  ANY UNDERWRITER OR AGENT.  NEITHER
THE  DELIVERY OF THIS PROSPECTUS OR THE PROSPECTUS SUPPLEMENT, NOR ANY SALE MADE
HEREUNDER OR THEREUNDER SHALL, UNDER  ANY CIRCUMSTANCES, CREATE ANY  IMPLICATION
THAT  THERE HAS  BEEN NO  CHANGE IN THE  AFFAIRS OF  THE COMPANY  SINCE THE DATE
HEREOF OR  THEREOF.  THIS  PROSPECTUS  AND  THE  PROSPECTUS  SUPPLEMENT  DO  NOT
CONSTITUTE  AN OFFER OR SOLICITATION BY ANYONE IN ANY JURISDICTION IN WHICH SUCH
OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER
OR SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION.

                             AVAILABLE INFORMATION

    The Company is subject to  the informational requirements of the  Securities
Exchange  Act of  1934 (the  "Exchange Act")  and in  accordance therewith files
reports,  proxy  or  information  statements  and  other  information  with  the
Securities  and Exchange Commission  (the "Commission"). Such  reports, proxy or
information statements and other information can be inspected and copied at  the
public reference facilities maintained by the Commission at Judiciary Plaza, 450
Fifth  Street, N.W.,  Washington, D.C. 20549,  and at  the Commission's Regional
Offices in New York (Seven World Trade  Center, New York, NY 10048) and  Chicago
(Northwestern  Atrium Center, 500  West Madison Street,  Suite 1400, Chicago, IL
60661). Copies  of such  material  can be  obtained  from the  Public  Reference
Section   of  the  Commission  at  Judiciary  Plaza,  450  Fifth  Street,  N.W.,
Washington, D.C. 20549, at prescribed rates. Certain of the Company's securities
are listed on the New York Stock Exchange, Inc. and the Pacific Stock  Exchange.
Reports,  proxy or information statements and other information can be inspected
at the offices of the New York Stock Exchange, Inc., 20 Broad Street, New  York,
NY  10005 and  the Pacific  Stock Exchange, 301  Pine Street,  San Francisco, CA
94104.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The Company incorporates herein by  reference the following documents  filed
under the Exchange Act with the Commission:

        (a) its Annual Report on Form 10-K for the year ended December 31, 1992;

        (b)  its Quarterly Report on  Form 10-Q for the  quarter ended March 31,
    1993; and

        (c) its Report on Form 8-K dated June 4, 1993, as amended by its  Report
    on Form 8-K/A No. 1 filed July 16, 1993.

    All  documents filed by the Company pursuant  to Section 13(a), 13(c), 14 or
15(d) of the Exchange  Act after the  date of this Prospectus  and prior to  the
termination  of  the offering  of  the Debt  Securities  shall be  deemed  to be
incorporated herein by reference and to be a part hereof from the date of filing
of such documents. Any statement contained herein or in a document  incorporated
or  deemed to be incorporated by reference herein shall be deemed to be modified
or superseded for  purposes of this  Prospectus to the  extent that a  statement
contained herein or in any other subsequently filed document which also is or is
deemed  to be incorporated by reference herein or in the accompanying Prospectus
Supplement modifies or supersedes such statement. Any such statement so modified
or superseded  shall not  be deemed,  except as  so modified  or superseded,  to
constitute a part of this Prospectus.

    The  Company hereby undertakes  to provide without charge  to each person to
whom this  Prospectus is  delivered, on  the  written or  oral request  of  such
person,  a copy of any or all of the documents referred to above which have been
or may be incorporated in this  Prospectus by reference, other than exhibits  to
such  documents. Such requests should be directed to Secretary, Sonat Inc., P.O.
Box 2563, Birmingham, AL 35202 (telephone: (205) 325-7104).

                                       2
<PAGE>
                                  THE COMPANY

    The Company,  a Delaware  corporation organized  in 1973,  is a  diversified
energy holding company which, through its subsidiaries, operates in two business
segments: Natural Gas Transmission and Marketing and Oil and Gas Exploration and
Production.

    Sonat  participates in the  natural gas transmission  and marketing business
through Southern Natural Gas Company ("Southern"), Citrus Corp. and Sonat Energy
Services Company. Southern,  an interstate  natural gas pipeline  company, is  a
major transporter and supplier of natural gas to the southeastern United States.
The 8,800-mile natural gas transmission system of Southern and its subsidiaries,
which  has a certificated  daily delivery capacity  of approximately 2.4 billion
cubic feet, extends primarily from gas  producing areas of Texas and  Louisiana,
both  onshore and offshore, to  markets in a seven-state  area of the southeast.
Citrus Corp., a holding  company 50% owned  by Sonat, owns  100% of Florida  Gas
Transmission Company ("Florida Gas"), an interstate natural gas pipeline company
that is the primary supplier of natural gas in the State of Florida and the sole
pipeline  supplier to peninsular Florida. Florida  Gas owns a 4,700-mile natural
gas transmission system  that extends from  south Texas to  a point near  Miami,
Florida,  and has  a certificated daily  delivery capacity of  925 million cubic
feet.  Sonat   Energy   Services  Company   is   active  in   the   acquisition,
transportation,  and  marketing of  natural gas,  primarily in  the southeastern
United  States.  Sonat's  natural  gas   pipeline  businesses  are  subject   to
significant regulation and competition.

    Sonat  Exploration  Company ("Exploration")  develops  and produces  oil and
natural gas, primarily in Texas, Louisiana, Arkansas, Oklahoma, Alabama and  the
Gulf  of Mexico. In 1988,  Exploration began a strategy  to acquire domestic gas
properties  with  significant  development  potential.  At  December  31,  1992,
Exploration's  proved reserves totalled approximately 1.1 trillion cubic feet of
natural gas equivalent.

    In  addition,  the  Company  owns  40%  of  Sonat  Offshore  Drilling   Inc.
("Offshore"), which prior to June 1993 had been a wholly owned subsidiary of the
Company.  In June 1993, Offshore  made an initial public  offering of its common
stock and the Company  sold additional shares of  Offshore common stock in  such
offering.  Offshore is  engaged in  contract drilling  of oil  and gas  wells in
offshore areas throughout the world.

    The Company's principal executive offices  are located at 1900 Fifth  Avenue
North,  AmSouth-Sonat  Tower, Birmingham,  AL  35203 and  its  principal mailing
address is P. O. Box 2563, Birmingham, AL 35202. The Company's telephone  number
at its principal executive offices is (205) 325-3800.

                                USE OF PROCEEDS

    Unless  otherwise provided  in the  Prospectus Supplement,  the net proceeds
from the sale of the Offered Debt Securities will be used for general  corporate
purposes,  which  may  include  refinancing  of  indebtedness,  working  capital
increases, capital expenditures, possible future acquisitions and redemption  of
securities.  Depending upon market  conditions, the Company  may obtain funds to
finance these expenditures from bank borrowings or the sale of commercial  paper
and  later  repay  such borrowings  with  the  proceeds from  the  sale  of Debt
Securities, or the Company may invest all or part of such proceeds in short-term
money market instruments pending utilization  of such proceeds. The Company  may
also engage in additional public or private financings of a character and amount
to be determined.

                           CAPITAL EXPENDITURE BUDGET

    The  Company's  consolidated capital  expenditures (including  joint venture
expenditures) for 1993  are expected  to aggregate  approximately $400  million,
which  will  include  oil  and  gas  acquisition,  exploration  and development,
pipeline expansion and other projects.

                                       3
<PAGE>
                 RATIOS OF EARNINGS FROM CONTINUING OPERATIONS
                                TO FIXED CHARGES

<TABLE>
<CAPTION>
                           THREE MONTHS
                           ENDED MARCH
                               31,         YEARS ENDED DECEMBER 31,
                           ------------  ----------------------------
                               1993      1992  1991  1990  1989  1988
                           ------------  ----  ----  ----  ----  ----
<S>                        <C>           <C>   <C>   <C>   <C>   <C>
Total Enterprise.........        3.4      1.8   1.5   1.7   2.0   1.6
</TABLE>

    For the  purpose  of calculating  the  ratios of  earnings  from  continuing
operations to fixed charges, earnings is defined as the sum of net income, fixed
charges  (net of interest capitalized) and  taxes based on income. Fixed charges
is defined as gross interest on  debt, including interest on amounts subject  to
refund,  amortization  of  debt discount  and  expense and  one-third  of rental
expense, which is considered representative  of the interest factor. The  ratios
also include the Company's share of the earnings and fixed charges of continuing
joint ventures.

                         DESCRIPTION OF DEBT SECURITIES

    The  following description  of the terms  of the Debt  Securities sets forth
certain general  terms  and  provisions  of the  Offered  Debt  Securities.  The
particular terms of the Offered Debt Securities and the extent, if any, to which
such  general provisions may apply to  the Offered Debt Securities are described
in the Prospectus Supplement relating to such Offered Debt Securities.

    The Debt Securities are to be issued under an indenture, dated as of June 1,
1986 (the "Indenture"), between the Company  and Chemical Bank, as successor  by
merger  to  Manufacturers Hanover  Trust Company,  Trustee (the  "Trustee"). The
following statements are summaries of certain provisions of the Indenture (which
is incorporated by  reference as  an exhibit  to the  Registration Statement  of
which  this Prospectus is a part) and  are subject to the detailed provisions of
the Indenture. Reference is hereby made to the Indenture for a full  description
of  such provisions, including definitions of  certain terms used, and for other
information with respect to the Debt Securities. Numerical references below  are
to Sections of the Indenture.

GENERAL

    The  Indenture  does  not  limit  the  aggregate  principal  amount  of Debt
Securities of any  particular series  of Offered  Debt Securities  which can  be
issued  thereunder and  provides that Debt  Securities may  be issued thereunder
from time to time  in one or  more series. Reference is  made to the  Prospectus
Supplement  for  the following  terms of  the Offered  Debt Securities:  (i) the
designation, aggregate  principal amount  and  authorized denominations  of  the
Offered  Debt Securities; (ii)  the percentage of the  principal amount at which
the Offered Debt Securities will be issued; (iii) the date or dates on which the
Offered Debt Securities will mature; (iv) the rate or rates (which may be  fixed
or  variable), or the method by which such rate or rates shall be determined, at
which the Offered Debt Securities will bear interest, if any, the date or  dates
from which such interest shall accrue, or the method by which such date or dates
shall  be determined, the dates on which  such interest shall be payable and the
regular record dates with respect thereto; (v)  the dates, if any, on which  and
the  price or prices at which the  Offered Debt Securities will, pursuant to any
mandatory sinking fund provisions, or may, pursuant to any optional sinking fund
provisions, be  redeemed  by the  Company,  and  the other  detailed  terms  and
provisions  of such sinking  funds; (vi) the  date, if any,  after which and the
price or  prices at  which the  Offered  Debt Securities  may, pursuant  to  any
optional  redemption provisions, be redeemed at the  option of the Company or of
the Holders thereof and the other detailed terms and provisions of such optional
redemptions; (vii) any additional or substituted restrictive covenants  included
for  the  benefit of  the  Offered Debt  Securities  or any  provision  that any
restrictive covenant  in the  Indenture  shall not  apply  with respect  to  the
Offered  Debt Securities; (viii) any additional  Events of Default provided with
respect to  the Offered  Debt Securities;  (ix) the  currency or  currencies  of
payment  of principal of and  premium, if any, and  interest on the Offered Debt
Securities; (x) any index used to determine the amount of payments of  principal
of  and premium, if any,  and interest on the  Offered Debt Securities; (xi) the
application of defeasance or covenant defeasance provisions to the Offered  Debt
Securities; and (xii) any other terms (which terms

                                       4
<PAGE>
shall not be inconsistent with the provisions of the Indenture). (Section 3.01.)
However,  with  respect  to Offered  Debt  Securities sold  through  agents, the
maturities and interest rates  of such Offered Debt  Securities may be fixed  by
the  Company from time to time, in which  case such maturities and rates are not
set forth in the Prospectus Supplement relating thereto but instead will be made
available through such agents.

    Unless otherwise indicated  in the Prospectus  Supplement relating  thereto,
principal,  premium, if  any, and  interest, if  any, will  be payable,  and the
Offered Debt  Securities will  be  exchangeable and  transfers thereof  will  be
registrable,  at the principal corporate trust office of the Trustee in New York
City, except that payment  of interest, if any,  on the Offered Debt  Securities
may  be made at the option of the Company  by check mailed to the address of the
person entitled  thereto as  it appears  in the  register for  the Offered  Debt
Securities. (Sections 3.05 and 6.02.)

    The  Debt Securities will  be unsecured and  will rank on  a parity with all
other unsecured and unsubordinated indebtedness of the Company.

    Unless otherwise indicated  in the Prospectus  Supplement relating  thereto,
the Offered Debt Securities will be issued only in fully registered form without
coupons  in denominations  of $1,000 or  integral multiples  thereof. No service
charge will  be  made  for  any  transfer  or  exchange  of  such  Offered  Debt
Securities, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith. (Sections 3.02
and 3.05.)

    Certain  of the Debt Securities may  be issued as discounted Debt Securities
(bearing no interest  or interest at  a rate which  at the time  of issuance  is
below  market  rates) to  be sold  at  a substantial  discount below  the stated
principal amount.  (Section 1.01.)  Federal income  tax consequences  and  other
special considerations applicable to any such discounted Debt Securities will be
described in the Prospectus Supplement relating thereto.

LIMITATION ON LIENS

    Unless  otherwise  indicated in  the Prospectus  Supplement relating  to the
Offered Debt Securities, the Company may not grant a Lien (as defined below)  to
secure  any indebtedness  for borrowed money,  or any guarantee  or indemnity in
respect thereof, upon, or with respect  to, any capital stock of any  Restricted
Subsidiary  (as defined below)  owned directly or indirectly  by the Company, or
upon, or  with respect  to, any  capital  stock of  any other  Subsidiary  owned
directly  by the Company, in each  case unless the Company shall, simultaneously
therewith or prior thereto,  take any and all  action necessary to procure  that
all  amounts payable by it under the Offered Debt Securities are secured equally
and ratably with (or prior to) such indebtedness (or such guarantee or indemnity
in respect thereof, as the  case may be); PROVIDED  that the foregoing does  not
prevent the Company from selling, conveying, distributing (through a dividend or
otherwise)  or transferring any  or all of  the capital stock  of any Restricted
Subsidiary or any other Subsidiary. (Section 6.04.)

    The holders  of a  majority  in principal  amount  of the  outstanding  Debt
Securities  of any series may waive compliance  by the Company with the covenant
contained in Section 6.04 of the Indenture  with respect to such series of  Debt
Securities. (Section 6.08.)

    The  term "Restricted Subsidiary" means  Southern, Offshore and Exploration,
each of which is a Delaware corporation  and was a subsidiary of the Company  as
of  the date  of the  Indenture, and any  Subsidiary of  the Company  which is a
successor of any of such corporations to  which all or substantially all of  the
properties  and  assets  of  any of  such  corporations  have  been transferred.
(Section 1.01.)

    The term "Subsidiary" means  any corporation of which  more than 50% of  the
outstanding  stock ordinarily entitled to vote shall at the time be owned by the
Company or by the Company in conjunction with one or more Subsidiaries or by one
or more Subsidiaries. (Section 1.01.)

    The term  "Lien" means  any  mortgage, pledge,  lien, encumbrance  or  other
security  interest which  secures the payment  or performance  of an obligation.
(Section 1.01.)

                                       5
<PAGE>
EVENTS OF DEFAULT

    Unless otherwise indicated in the Prospectus Supplement, the following  will
be  Events of  Default under the  Indenture with  respect to any  series of Debt
Securities: (a) default  in the payment  of any installment  of interest on  any
Debt  Securities of that series when due,  continued for 30 days; (b) default in
the payment of  principal or premium,  if any,  on any Debt  Securities of  that
series  when due; (c) default in the payment or satisfaction of any sinking fund
obligation with respect to  Debt Securities of that  series when due,  continued
for  30 days; (d) failure to observe or perform any other covenant (other than a
covenant included  in  the Indenture  for  the benefit  of  any series  of  Debt
Securities  other than that  series) continued for  90 days after  notice by the
Trustee or by the  Holders of 25%  in principal amount  of the outstanding  Debt
Securities  of  such  series;  (e)certain events  of  bankruptcy,  insolvency or
reorganization with respect to  the Company; or (f)  any other Event of  Default
provided  with respect to Debt Securities of  that series. A default under other
indebtedness of the Company will not be an Event of Default under the Indenture,
and an Event of Default with respect  to a particular series of Debt  Securities
issued  under the  Indenture will  not necessarily be  an Event  of Default with
respect to any  other series of  Debt Securities issued  thereunder. In case  an
Event  of Default shall  occur and be  continuing with respect  to any series of
Debt Securities, the Trustee or  the Holders of not  less than 25% in  aggregate
principal  amount  of the  Debt Securities  then outstanding  of the  series may
declare the principal (or, if the Debt Securities of such series are  discounted
Debt  Securities, such portion of the principal as may be specified in the terms
of such series) of such  series and the interest accrued  thereon to be due  and
payable. (Section 8.01.)

    The  Holders of a majority in  aggregate principal amount of the outstanding
Debt Securities of any series may waive any default resulting in acceleration of
maturity of the Debt  Securities of such  series but only  if all defaults  with
respect  to such series have  been remedied and all  payments due (other than by
acceleration) with respect to such series have been made. (Section 8.01.)  Prior
to  acceleration  of maturity  of a  particular series  of Debt  Securities, the
Holders of a  majority in  aggregate principal  amount of  the outstanding  Debt
Securities of such series may on behalf of the Holders of all Debt Securities of
such  series waive  any past default  under the Indenture  and its consequences,
except a  default in  the payment  of interest  or premium,  if any,  on or  the
principal of any of the Debt Securities of such series. (Section 8.06.)

    Reference  is made to  the Prospectus Supplement relating  to each series of
Offered Debt Securities which are discounted Debt Securities for the  particular
provisions  relating  to  acceleration  of  the maturity  of  a  portion  of the
principal amount of such  discounted Debt Securities upon  the occurrence of  an
Event of Default and the continuation thereof.

    The  Indenture  requires the  Company to  file annually  with the  Trustee a
certificate as to the absence of default and as to compliance with the terms  of
the  Indenture.  (Section 6.07.)  The Indenture  provides  that the  Trustee may
withhold notice to the Holders of the Debt Securities of any default (except  in
payment  of principal, premium, if any, or interest or in payment of any sinking
fund obligation) if it considers it in  the interest of the Holders of the  Debt
Securities to do so. (Section 8.07.)

    Subject  to the provisions  of the Indenture  relating to the  duties of the
Trustee in case an Event of Default shall occur and be continuing, the Indenture
provides that the Trustee shall  be under no obligation  to exercise any of  its
rights  or powers under the Indenture at  the request, order or direction of the
Holders of the  Debt Securities unless  such Holders shall  have offered to  the
Trustee  reasonable indemnity. (Sections  8.04, 9.01 and  9.02.) Subject to such
provisions for  indemnification and  certain other  rights of  the Trustee,  the
Indenture  provides that the  Holders of a  majority in principal  amount of the
outstanding Debt Securities  of any series  shall have the  right to direct  the
time,  method and place of conducting any proceeding for any remedy available to
the Trustee  or exercising  any trust  or power  conferred on  the Trustee  with
respect to the Debt Securities of such series. (Sections 8.06 and 9.02.)

MODIFICATION OF INDENTURE

    Except  as to certain modifications and amendments not adverse to Holders of
outstanding Debt Securities, modifications and  amendments of the Indenture  may
be made by the Company and the

                                       6
<PAGE>
Trustee  only  with  the consent  of  the  Holders of  a  majority  in aggregate
principal amount of the outstanding Debt Securities of each series issued  under
the  Indenture which is affected by the modification or amendment, provided that
no such modification or  amendment may: (i) change  the stated maturity date  of
the  principal of, or any installment of  interest on, any Debt Security, reduce
the principal amount  of, or  the interest  (or premium,  if any)  on, any  Debt
Security (including in the case of a discounted Debt Security the amount payable
upon acceleration of the maturity thereof or provable in bankruptcy), change the
currency of payment of principal of or interest (or premium, if any) on any Debt
Security,  or impair  the right  to institute  suit for  the enforcement  of any
payment of the  principal of,  and premium,  if any,  and interest  on any  Debt
Security,  without the  consent of  the Holder  of such  Debt Security;  or (ii)
reduce the aforesaid  percentage of  Debt Securities  the Holders  of which  are
required  to consent to modify or amend the Indenture without the consent of the
Holders of all Securities affected thereby. (Sections 8.04, 12.01 and 12.02.)

DEFEASANCE AND COVENANT DEFEASANCE

    The Indenture provides  that, if and  to the extent  that the provisions  of
Article  Fifteen are made  applicable to the  Debt Securities of  any series and
certain conditions are met, the Company may elect either or both (A) to  defease
and  be  discharged from  any  and all  obligations  with respect  to  such Debt
Securities (except for the obligations to  register the transfer or exchange  of
such  Debt Securities,  to replace  temporary or  mutilated, destroyed,  lost or
stolen Debt Securities, to maintain an office  or agency in respect of the  Debt
Securities  and to hold moneys for payment in trust) ("defeasance") or (B) to be
released from its obligations with respect to such Debt Securities under Section
6.04 of the  Indenture (being  the restrictions described  under "Limitation  on
Liens")  and any omission to comply with such obligations will not constitute an
Event of  Default with  respect to  Debt Securities  of such  series  ("covenant
defeasance"), upon the irrevocable deposit with the Trustee (or other qualifying
trustee),  in  trust for  such purpose,  of money,  or Eligible  Obligations (as
defined) or U.S. Government Obligations  (as defined) which through the  payment
of  principal and interest in accordance with their terms will provide money, in
an amount sufficient to pay the principal of (and premium, if any) and  interest
on  such Debt Securities,  and any mandatory sinking  fund or analogous payments
thereon, on the scheduled due dates therefor. (Article Fifteen.)

    Under current  federal income  tax law,  in the  event the  Company  effects
defeasance  it  is likely  that any  such  deposit in  trust of  money, Eligible
Obligations or U.S. Government Obligations  and discharge of the Indenture  with
respect  to any series of Debt Securities  will be treated as a taxable exchange
of such series of Debt Securities for interests in such trust. In that event,  a
Holder  of  the  Debt  Securities  will recognize  gain  or  loss  equal  to the
difference between the Holder's cost or other tax basis for the Debt  Securities
and  the value of  the Holder's interest  in such trust,  and thereafter will be
required to include in income a share of the income, gain and loss of the trust.
Purchasers of the  Debt Securities should  consult their own  tax advisers  with
respect to the tax consequences to them of such deposit and discharge, including
the applicability and effect of tax laws other than the federal income tax law.

    In  the event the  Company effects covenant defeasance  with respect to Debt
Securities of any series and the Debt Securities of such series are declared due
and payable because of the  occurrence of any Event  of Default (other than  the
Event  of Default described in clause (d) under "Events of Default" with respect
to Section 6.04 of the Indenture), the amount of money, Eligible Obligations and
U.S. Government Obligations on  deposit with the Trustee  will be sufficient  to
pay  amounts due  on the  Debt Securities of  such series  at the  time of their
stated maturity  but may  not  be sufficient  to pay  amounts  due on  the  Debt
Securities  of such series at  the time of the  acceleration resulting from such
Event of Default. However, the Company will remain liable for such payments.

    The term  "Eligible Obligations"  means interest  bearing obligations  as  a
result  of the  deposit of which  the Debt  Securities are rated  in the highest
generic long-term debt rating category assigned to legally defeased debt by  one
or more nationally recognized rating agencies. (Section 1.01.)

    The  term "U.S. Government Obligations" means  (i) direct obligations of, or
obligations the principal of and interest on which are fully guaranteed by,  the
United States of America (provided that such

                                       7
<PAGE>
obligations are not callable or redeemable at the option of the issuer thereof),
or  (ii) depository receipts issued by a bank or trust company as custodian with
respect to any U.S. Government Obligation described in clause (i) or a  specific
payment of interest on or principal of any such U.S. Government Obligations held
by  such  custodian for  the  account of  the  holder of  a  depository receipt,
PROVIDED that (except as  required by law) such  custodian is not authorized  to
make  any deduction  from the  amount payable to  the holder  of such depository
receipt from  any  amount received  by  the custodian  in  respect of  the  U.S.
Government  Obligations or the  specific payment of interest  on or principal of
the U.S. Government Obligations evidenced  by such depository receipt, or  (iii)
securities that are backed by any U.S. Government Obligation described in clause
(i)  as  collateral under  an arrangement  by which  the principal  and interest
payments on the collateral generally flow directly through to the holder of  the
Security. (Section 1.01.)

    The  Prospectus  Supplement may  further  describe the  provisions,  if any,
permitting such  defeasance or  covenant  defeasance with  respect to  the  Debt
Securities of a particular series.

CONSOLIDATION, MERGER, SALE, RESTRUCTURING OR HIGHLY LEVERAGED TRANSACTION

    Nothing  in  the  Indenture prohibits  the  consolidation or  merger  of the
Company with  or  into any  other  corporation, or  the  sale or  conveyance  of
substantially all of the Company's properties to any other person (including any
Subsidiary), without the consent of the Holders of the Debt Securities, provided
that  (i)  the  successor  assumes  all obligations  of  the  Company  under the
Indenture and the Debt Securities, (ii) immediately after giving effect to  such
transaction,  no Event of Default (and no  event which, after notice or lapse of
time or both, would constitute an Event  of Default) shall have occurred and  be
continuing and (iii) certain other conditions are met. (Article Thirteen.) Other
than the covenants and provisions in the Indenture described above, there are no
covenants  or provisions in the Indenture which would provide the Holders of the
Debt Securities with any special protection  or rights in the event the  Company
is   involved   in  a   change   of  control,   highly   leveraged  transaction,
reorganization, restructuring or  merger, or similar  transaction involving  the
Company that may adversely affect holders of the Debt Securities.

THE TRUSTEE

    Chemical  Bank,  as  successor  by  merger  to  Manufacturers  Hanover Trust
Company, is  trustee  for certain  of  the Company's  subsidiaries  under  other
indentures,  is a depositary of the Company, has from time to time made loans to
the Company and certain of its subsidiaries and has performed other services for
the Company and its subsidiaries in the normal course of its business.

                              PLAN OF DISTRIBUTION

    The Company may sell Debt Securities  to or through underwriters or  agents,
or  directly to other purchasers. Underwriters  may sell Offered Debt Securities
directly  to  other  purchasers  or  through  other  dealers,  who  may  receive
compensation  from the  underwriters in  the form  of discounts,  concessions or
commissions.  The  Prospectus  Supplement  with  respect  to  the  Offered  Debt
Securities  sets forth the terms of the offering, including the name or names of
any  underwriters  or  agents,  any  discounts,  commissions  and  other   items
constituting  compensation from the  Company, and any  discounts, concessions or
commissions allowed or reallowed or paid  by any underwriters to other  dealers.
Underwriters,  dealers  and  agents  participating in  the  distribution  of the
Offered Debt Securities may be deemed  to be underwriters, and any discounts  or
commissions  received by  them and  any profit  realized by  them on  the resale
thereof may be deemed  to be underwriting discounts  and commissions, under  the
Securities Act of 1933.

    The  Debt  Securities  may  be  sold  from  time  to  time  in  one  or more
transactions at a fixed price or prices, which may be changed, at market  prices
prevailing  at the time of  sale, at prices related to  such market prices or at
negotiated prices. The Company also may,  from time to time, authorize  dealers,
acting  as the Company's agents, to solicit  offers to purchase the Offered Debt
Securities upon the terms and conditions set forth in any Prospectus Supplement.

                                       8
<PAGE>
    If so  indicated in  the Prospectus  Supplement, the  Company may  authorize
underwriters  or agents to solicit offers  by specified institutions to purchase
Offered Debt Securities from the Company at the offering price set forth in  the
Prospectus  Supplement  pursuant  to delayed  delivery  contracts  providing for
payment and delivery on a specified date  in the future. Such contracts will  be
subject  only to those conditions set forth in the Prospectus Supplement and any
commission payable  for solicitation  of  such contracts  is  set forth  in  the
Prospectus Supplement.

    Underwriters  and agents may be entitled  under agreements entered into with
the Company to indemnification by the Company against certain civil liabilities,
including liabilities under the  Securities Act of 1933,  or to contribution  by
the  Company to payments they  may be required to  make in respect thereof. Such
underwriters and agents  may be customers  of, engage in  transactions with,  or
perform  services for the Company and its subsidiaries in the ordinary course of
business.

                                 LEGAL OPINIONS

    The legality of the Debt Securities will  be passed upon for the Company  by
Hughes  Hubbard &  Reed, One Battery  Park Plaza,  New York, NY  10004. L. Edwin
Smart, a director of the  Company, serves as counsel to  the law firm of  Hughes
Hubbard  & Reed. Unless otherwise indicated in the Prospectus Supplement related
thereto, if the Offered Debt Securities are being distributed in an underwritten
offering, the validity of the Offered Debt Securities will be passed on for  the
Underwriters by Sullivan & Cromwell, 125 Broad Street, New York, NY 10004.

                                    EXPERTS

    The  consolidated  financial  statements  and schedules  of  Sonat  Inc. and
Subsidiaries appearing in the Sonat Inc. Annual Report (Form 10-K) for the  year
ended  December  31,  1992, have  been  audited  by Ernst  &  Young, independent
auditors, as set forth in their report included therein and incorporated  herein
by  reference. Such  consolidated financial  statements and  financial statement
schedules are  incorporated herein  by reference  in reliance  upon such  report
given upon the authority of such firm as experts in accounting and auditing.

                                       9
<PAGE>
- ----------------------------------------------
                                  ----------------------------------------------
- ----------------------------------------------
                                  ----------------------------------------------

    NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  MAKE  ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN  THIS
PROSPECTUS  SUPPLEMENT OR THE PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION
OR REPRESENTATIONS  MUST NOT  BE RELIED  UPON AS  HAVING BEEN  AUTHORIZED.  THIS
PROSPECTUS  SUPPLEMENT AND THE PROSPECTUS DO NOT  CONSTITUTE AN OFFER TO SELL OR
THE SOLICITATION OF  AN OFFER TO  BUY ANY SECURITIES  OTHER THAN THE  SECURITIES
DESCRIBED  IN THIS PROSPECTUS SUPPLEMENT AND THE  PROSPECTUS OR AN OFFER TO SELL
OR THE SOLICITATION OF AN OFFER TO  BUY SUCH SECURITIES IN ANY CIRCUMSTANCES  IN
WHICH  SUCH  OFFER OR  SOLICITATION IS  UNLAWFUL. NEITHER  THE DELIVERY  OF THIS
PROSPECTUS  SUPPLEMENT  OR  THE  PROSPECTUS  NOR  ANY  SALE  MADE  HEREUNDER  OR
THEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS
BEEN  NO CHANGE IN THE AFFAIRS OF THE  COMPANY SINCE THE DATE HEREOF OR THAT THE
INFORMATION CONTAINED HEREIN OR THEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT  TO
THE DATE OF SUCH INFORMATION.

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

                               TABLE OF CONTENTS
                             PROSPECTUS SUPPLEMENT

<TABLE>
<CAPTION>
                                                        PAGE
                                                        -----
<S>                                                  <C>
The Company........................................         S-2
Use of Proceeds....................................         S-2
Description of Notes...............................         S-3
Underwriting.......................................         S-5
Validity of the Notes..............................         S-5
Experts............................................         S-6

                           PROSPECTUS
Available Information..............................           2
Incorporation of Certain Documents by Reference....           2
The Company........................................           3
Use of Proceeds....................................           3
Capital Expenditure Budget.........................           3
Ratios of Earnings from Continuing Operations to
 Fixed Charges.....................................           4
Description of Debt Securities.....................           4
Plan of Distribution...............................           8
Legal Opinions.....................................           9
Experts............................................           9
</TABLE>

                                  $200,000,000

                                   SONAT INC.

                                  6 7/8% NOTES
                                DUE JUNE 1, 2005

                                  -----------

                             PROSPECTUS SUPPLEMENT

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                              GOLDMAN, SACHS & CO.
                              MERRILL LYNCH & CO.
                             CHASE SECURITIES, INC.

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