WESTERN ATLAS INC
S-3, 1998-03-11
OIL & GAS FIELD EXPLORATION SERVICES
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<PAGE>   1
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 11, 1998
 
                                               REGISTRATION NO. 333-
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------
                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                               WESTERN ATLAS INC.
           (Exact name of the registrant as specified in its charter)
 
<TABLE>
<S>                                                    <C>
                      DELAWARE                                              95-3899675
  (State or other jurisdiction of incorporation or            (I.R.S. Employer Identification Number)
                    organization)
</TABLE>
 
                             10205 WESTHEIMER ROAD
                              HOUSTON, TEXAS 77042
                                 (713) 972-4000
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                             ---------------------
                             JAMES E. BRASHER, ESQ.
                   SENIOR VICE PRESIDENT AND GENERAL COUNSEL
                             10205 WESTHEIMER ROAD
                              HOUSTON, TEXAS 77042
                                 (713) 972-4000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                             ---------------------
                                   Copies to:
 
<TABLE>
<S>                                                    <C>
               C. NEEL LEMON III, ESQ.                                ARTHUR H. ROGERS, ESQ.
               THOMPSON & KNIGHT, P.C.                              FULBRIGHT & JAWORSKI L.L.P.
           1700 PACIFIC AVENUE, SUITE 3300                       1301 MCKINNEY STREET, SUITE 5100
              DALLAS, TEXAS 75201-4693                               HOUSTON, TEXAS 77010-3095
                   (214) 969-1700                                         (713) 651-5151
</TABLE>
 
                             ---------------------
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the date this Registration Statement becomes effective.
 
     If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]
 
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  [ ]
 
     If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
 
     If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
==============================================================================================================================
                                                                            PROPOSED
                                                                             MAXIMUM         PROPOSED MAXIMUM       AMOUNT OF
TITLE OF EACH CLASS OF                                AMOUNT TO BE       OFFERING PRICE     AGGREGATE OFFERING    REGISTRATION
  SECURITIES TO BE REGISTERED                          REGISTERED          PER NOTE(1)           PRICE(1)              FEE
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                 <C>                 <C>                     <C>
Senior Notes......................................    $200,000,000            100%             $200,000,000          $59,000
==============================================================================================================================
</TABLE>
 
(1) Estimated solely for purposes of calculating the registration fee pursuant
    to Rule 457(o) under the Securities Act of 1933.
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
================================================================================
<PAGE>   2
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
                  SUBJECT TO COMPLETION, DATED MARCH 11, 1998
                                  $200,000,000
 
                               WESTERN ATLAS INC.
 
[WESTERN ATLAS LOGO]         % SENIOR NOTES DUE 2008
                             ---------------------
 
     Interest on the   % Senior Notes due             , 2008 (the "Notes") is
payable on             and           of each year, commencing             ,
1998. The Notes may be redeemed at any time at the option of the Company, in
whole or in part, at a price equal to 100% of the principal amount thereof plus
accrued and unpaid interest, if any, to the date of redemption plus a Make-Whole
Premium as defined herein, if any, relating to the then prevailing Treasury
Yield as defined herein and the remaining life of the Notes. The Notes will be
represented by one or more global notes ("Global Notes") registered in the name
of the nominee of The Depository Trust Company ("DTC"). 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, the Notes will not be offered in definitive form. The Notes will be
issued only in denominations of $1,000 and integral multiples thereof. See
"Description of the Notes."
 
     Concurrently with the offering made hereby, the Company is also offering
  % Adjustable Conversion-rate Equity Security Units, which in the aggregate
consist of (a) contracts to purchase between           and           shares
(          and           shares if the underwriters' over-allotment option is
exercised in full) of Common Stock on        , 2001 and (b) $     million of   %
Quarterly Income Preferred Securities of the Company maturing on             ,
2003. The Units Offering is being made by a separate prospectus. Neither the
Units Offering nor the offering made hereby is conditioned on the consummation
of the other offering.
                             ---------------------
  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.
                             ---------------------
 
<TABLE>
<CAPTION>
                                           INITIAL PUBLIC        UNDERWRITING      PROCEEDS TO
                                          OFFERING PRICE(1)      DISCOUNT(2)       COMPANY(3)
                                          -----------------      ------------      -----------
<S>                                       <C>                    <C>               <C>
Per Note................................          %                   %                %
Total...................................  $                           $             $
</TABLE>
 
- ---------------
 
(1) Plus accrued interest, if any, from             , 1998.
 
(2) The Company has agreed to indemnify the Underwriters against certain
    liabilities, including liabilities under the Securities Act of 1933.
 
(3) Before deducting estimated expenses of $          payable by the Company.
                             ---------------------
 
     The Notes offered hereby 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             , 1998, against payment therefor
in immediately available funds.

GOLDMAN, SACHS & CO.
                   CHASE SECURITIES INC.
                                           NATIONSBANC MONTGOMERY SECURITIES LLC
                             ---------------------
 
               The date of this Prospectus is             , 1998.
<PAGE>   3
 
                           FORWARD-LOOKING STATEMENTS
 
     The statements included or incorporated in this Prospectus regarding future
financial performance and results and the other statements that are not
historical facts are "forward-looking statements" within the meaning of Section
27A of the Securities Act of 1933, as amended (the "Securities Act"), and
Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"). Such statements may include, but are not limited to, projections of
earnings, revenues, income or loss, capital expenditures, plans for future
operations and financing needs or plans, as well as assumptions relating to the
foregoing. The words "expect", "project", "estimate", "intend", "plan",
"predict", "anticipate", "believe", "may" and similar expressions as they relate
to the Company or its management are also intended to identify forward-looking
statements. Forward-looking statements are inherently subject to risks and
uncertainties, some of which cannot be predicted or quantified. Future events
and actual results, performance and achievements could differ materially from
those set forth in, contemplated by or underlying the forward-looking
statements. Such factors include, but are not limited to, dependence upon oil
and gas industry spending, worldwide prices and demand for oil and gas, the
presence of competitors with greater financial and other resources,
technological changes and developments, operating risks inherent in the oilfield
services industry, operating risks related to oil and gas exploration and
production activities, regulatory uncertainties, worldwide political stability
and economic conditions, operating risks associated with international activity,
and other risks and uncertainties described in this Prospectus and in the
Company's other filings with the Securities and Exchange Commission (the
"Commission"). Should one or more of these risks or uncertainties materialize,
or should underlying assumptions prove incorrect, actual outcomes may vary
materially from those indicated.
 
                             ---------------------
 
     CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE MARKET PRICE OF THE NOTES,
INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS IN THE
NOTES AND THE IMPOSITION OF PENALTY BIDS, IN CONNECTION WITH THIS OFFERING. FOR
A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING".
 
                             ---------------------
 
                                       ii
<PAGE>   4
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Exchange
Act and in accordance therewith files reports, proxy statements and other
information with the Commission. Such reports, proxy statements and other
information can be inspected and copied at the public reference facilities
maintained by the Commission at 450 Fifth Street, N.W., Room 1024, Washington,
D.C. 20549, and at the Commission's regional offices at Seven World Trade
Center, Suite 1300, New York, New York 10048 and Citicorp Center, 500 West
Madison Street, Suite 1400, Chicago, Illinois 60661, and copies may be obtained
at prescribed rates from the Public Reference Section of the Commission at its
principal office in Washington, D.C. In addition, such reports, proxy statements
and other information may be accessed electronically at the Commission's site on
the World Wide Web at http://www.sec.gov. The Company's reports are also on file
at the offices of the New York Stock Exchange, 20 Broad Street, New York, New
York 10005.
 
     This Prospectus constitutes a part of a Registration Statement on Form S-3
(together with all amendments and exhibits, referred to herein as the
"Registration Statement") filed by the Company with the Commission under the
Securities Act with respect to the Notes. This Prospectus does not contain all
of the information set forth in the Registration Statement and the exhibits and
schedules thereto, certain parts of which are omitted as permitted by the rules
and regulations of the Commission. For further information with respect to the
Company and the securities being offered hereby, reference is made to the
Registration Statement which can be inspected at the public reference facilities
at the offices of the Commission set forth above. Any statements contained
herein concerning the provision of any document filed as an exhibit to the
Registration Statement or otherwise filed with the Commission or incorporated by
reference herein are not necessarily complete, and, in each instance, reference
is made to the copy of such document so filed for a more complete description of
the matter involved. Each such statement is qualified in its entirety by such
reference.
 
                                       iii
<PAGE>   5
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed by the Company (File No. 1-12430) with the
Commission pursuant to the Exchange Act are incorporated by reference herein and
made a part hereof:
 
          (1) Annual Report on Form 10-K for the fiscal year ended December 31,
     1997, as amended by Form 10-K/A filed on March 11, 1998, and
 
          (2) Current Report on Form 8-K filed on March 10, 1998.
 
     All documents filed by the Company with the Commission pursuant to Section
13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this
Prospectus and prior to the termination of the offering of the securities being
offered hereby shall be deemed to be incorporated by reference in this
Prospectus and to be a part hereof from the date of filing of such documents,
unless any such document shall expressly state that it is not to be incorporated
by reference.
 
     Any statement contained 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) 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 or any amendment
or supplement hereto.
 
     The Company undertakes to provide without charge to each person to whom a
copy of this Prospectus is delivered, upon the written or oral request of such
person, a copy of any or all of the documents incorporated herein by reference,
other than exhibits to such documents unless such exhibits are specifically
incorporated by reference into such documents. Requests for such documents
should be directed to the Company's principal executive office located at 10205
Westheimer Road, Houston, Texas 77042, Attention: James E. Brasher, Senior Vice
President and General Counsel, telephone number: (713) 972-4000.
 
                                       iv
<PAGE>   6
 
                               PROSPECTUS SUMMARY
 
     The following summary should be read in conjunction with, and is qualified
in its entirety by, the more detailed information, including the Company's
consolidated financial statements and notes thereto, incorporated herein by
reference. Unless the context otherwise requires, references in this Prospectus
to the "Company" or "Western Atlas" shall mean Western Atlas Inc. and its
subsidiaries and "UNOVA" shall mean UNOVA, Inc., which was spun-off from the
Company in October 1997. Unless otherwise indicated, all financial information
and share data in this Prospectus assume no exercise of the underwriters'
over-allotment option in the Units Offering. UNOVA's operations through October
31, 1997 are reported in the Company's financial statements as discontinued
operations.
 
                                  THE COMPANY
 
     Western Atlas is a leading supplier of oilfield services and reservoir
information technologies for the worldwide oil and gas industry. It operates
primarily through three divisions: Western Geophysical, Western Atlas Logging
Services, and E&P Services. The Company specializes in land, marine, and
transition-zone seismic data acquisition and processing services; open-hole and
cased-hole well-logging services; reservoir characterization; and exploration
and production techniques and management services. The Company's revenues have
grown from approximately $1.4 billion in 1996 to approximately $1.7 billion in
1997, an increase of 17%. During this period, earnings from continuing
operations before interest, taxes, depreciation, amortization, and non-recurring
items ("EBITDA") grew from approximately $457 million to approximately $570
million, an increase of 25%.
 
     The Company, through its predecessors, has provided services to the oil and
gas industry since 1932. In October 1997, to focus exclusively on the oilfield
service sector, the Company distributed the common stock of UNOVA, its then
wholly-owned industrial automation systems subsidiary, to the shareholders of
the Company in a tax-free spin-off (the "Spin-off").
 
     The Company's strategy is to maximize shareholder value by providing
value-added services to its clients, maintaining operational excellence, and
pursuing internal and external growth opportunities. The Company's reservoir
information services enable clients to more quickly locate hydrocarbons, reduce
exploration, development, and production risks, and maximize returns. Western
Atlas intends to enhance its significant market positions in its core businesses
by continuing to invest substantial amounts of intellectual and financial
capital into new services, products, and technologies.
 
     The successful implementation of this strategy has provided the Company
with the following competitive strengths:
 
          LARGEST AND MOST COMPREHENSIVE PROVIDER OF SEISMIC ACQUISITION
     SERVICES. The Company, through its Western Geophysical division ("WG"), is
     the largest provider of seismic acquisition services to the oil and gas
     industry. On a worldwide basis, Western offers an advanced fleet of
     purpose-built seismic vessels for deepwater streamer and ocean-bottom cable
     ("OBC") exploration, the industry's largest land-crew organization for
     all-terrain surveys, and innovative technologies for seamless coverage
     across shallow-water transition zones. The Company has further strengthened
     its position in the offshore segment through the aggressive pursuit of
     solid-streamer technology, vessel upgrades, OBC technologies (including
     multicomponent sensor technologies), and time-lapse 3-D ("4-D") reservoir
     monitoring services.
 
          MOST EXTENSIVE MULTICLIENT SEISMIC DATA LIBRARY. WG has the most
     extensive non-exclusive data library in the industry and continues to add
     new data thereto. The Company believes this library provides clients with
     high-quality seismic data for oil and gas activities at cost-effective
     prices. The Company's library is geographically diverse, contains a
     significant amount of recently acquired data, and is well suited for a
     broad range of client applications, particularly
                                        1
<PAGE>   7
 
     in those areas where higher levels of exploration and development activity
     are expected in the near future.
 
          INDUSTRY LEADING SEISMIC DATA PROCESSING. WG provides industry leading
     seismic data processing services. The Company provides these services
     worldwide through a network of in-field and dedicated data processing
     centers, as well as client operated facilities. The Company's seismic data
     processing capacity has increased by over 600% since 1995. In addition, the
     Company believes its proprietary Omega(R) seismic processing system is
     becoming an industry standard.
 
          ADVANCED LOGGING AND PERFORATING SERVICES. The Company provides
     advanced logging and perforating services to clients through its Western
     Atlas Logging Services division ("WALS"). During the last four years, WALS
     has invested significant amounts of financial and intellectual capital to
     develop new logging, perforating, and other wireline technologies and
     services. The Company believes that its logging services, instruments, and
     geoscientific interpretation services are currently among the best
     available in the industry.
 
          STATE-OF-THE-ART INTEGRATED RESERVOIR STUDIES. Western Atlas has
     developed methods to integrate geophysical, geological, and petrophysical
     data into a single reservoir model which provides clients with a
     multidimensional view of their reservoirs. In addition, the Company
     believes these services will become an important component in the emerging
     4-D reservoir monitoring market.
 
          EXPLORATION AND PRODUCTION SERVICES. Through its E&P Services division
     ("E&PS"), the Company possesses exploration and production technology using
     engineering, geophysical and geological disciplines, including integrated
     reservoir and subsurface analysis, reservoir characterization and modeling,
     and prospect generation and selection. As a service provider and as a
     partner with oil and gas companies, E&PS utilizes its capabilities and
     experience to identify potential hydrocarbon-bearing properties and enhance
     the ability of oil and gas companies to explore, develop, and produce
     hydrocarbons.
 
                                THE ACQUISITIONS
 
     On March 8, 1998, the Company entered into an agreement to acquire the
stock of Wedge Dia-Log, Inc. ("Wedge Dia-Log") for approximately $218 million in
cash (the "Wedge Acquisition"). Wedge Dia-Log is a wireline company specializing
in cased-hole and pipe recovery services. Subject to the satisfaction of
customary conditions, including applicable regulatory approval, the Company
intends to close the Wedge Acquisition on or about April 1, 1998.
 
     In addition, on March 8, 1998, the Company entered into an agreement to
acquire the stock of 3-D Geophysical, Inc. ("3-D Geophysical"), a supplier of
primarily land-based seismic data acquisition services (the "3-D Acquisition"
and, together with the Wedge Acquisition, the "Acquisitions"). The agreement
provides for an all-cash tender offer of $9.65 per share for an aggregate
consideration of approximately $115 million if all shares are acquired. The
Company intends to close the 3-D Acquisition following consummation of this
offering; however, such closing is subject to the tender of more than 50% of the
outstanding shares of common stock of 3-D Geophysical and other customary
conditions, including applicable regulatory approvals. The 3-D Acquisition, if
consummated, will enhance the Company's seismic data acquisition capabilities in
the United States, Canada, Mexico, and Peru.
 
                                        2
<PAGE>   8
 
                                  THE OFFERING
 
Securities Offered.........  $200 million aggregate principal amount of     %
                             Senior Notes due     , 2008 (the "Notes").
 
Interest Payment Dates.....       and     , commencing             , 1998.
 
Ranking....................  The Notes will rank pari passu with all existing
                             unsecured, unsubordinated indebtedness of the
                             Company. See "Description of the Notes -- Ranking".
 
Optional Redemption........  The Notes may be redeemed at any time at the option
                             of the Company, in whole or in part, at a price
                             equal to 100% of the principal amount thereof plus
                             accrued and unpaid interest, if any, to the date of
                             redemption plus a Make-Whole Premium as defined
                             herein, if any, relating to the then prevailing
                             Treasury Yield as defined herein and the remaining
                             life of the Notes. See "Description of the
                             Notes -- Optional Redemption".
 
Certain Covenants..........  The Indenture relating to the Notes will contain
                             limitations on the Company's ability to (i) incur
                             indebtedness secured by certain liens, (ii) engage
                             in certain sale/leaseback transactions, and (iii)
                             engage in certain merger, consolidation or
                             reorganization transactions. See "Description of
                             the Notes -- Certain Covenants".
 
Use of Proceeds............  The Company intends to use the net proceeds of this
                             Notes offering (estimated to be $198.5 million) and
                             the net proceeds of the Units Offering as defined
                             herein (estimated to be $387.4 million) to fund the
                             Acquisitions totaling approximately $333 million
                             (assuming 100% of the shares are acquired in the
                             3-D Acquisition) and to repay approximately $253
                             million of commercial paper and other borrowings.
                             See "Use of Proceeds".
 
Concurrent Units
Offering...................  Concurrently with the offering of Notes made
                             hereby, the Company is also engaged in an offering
                             (the "Units Offering") of      % Adjustable
                             Conversion-rate Equity Security Units (the
                             "Units"), which in the aggregate consist of (a)
                             contracts to purchase between     and      shares
                             (     and     shares if the underwriters'
                             over-allotment option is exercised in full) of
                             common stock, $1.00 par value per share (the
                             "Common Stock"), of the Company on       , 2001 and
                             (b) $400 million of     % Quarterly Income
                             Preferred Securities of the Company maturing on
                                      , 2003. The Units Offering is being made
                             by means of a separate prospectus. Neither the
                             Units Offering nor this Notes offering is
                             conditioned on the consummation of the other
                             offering. There can be no assurance that the Units
                             Offering will be consummated. This Prospectus does
                             not constitute an offer to sell or the solicitation
                             of an offer to buy the Units being offered in the
                             Units Offering.
 
                                        3
<PAGE>   9
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
 
     The following table sets forth summary consolidated financial data for the
Company and its subsidiaries as of and for the three years ended December 31,
1997. The summary financial data have been derived from the Company's audited
consolidated financial statements incorporated by reference herein. On October
31, 1997, the shares of common stock of UNOVA were distributed to the Company's
shareholders pursuant to the Spin-off. UNOVA's operations through October 31,
1997 are reported in the Company's financial statements as discontinued
operations. The following data is based on continuing operations and should be
read in conjunction with "Selected Consolidated Financial Data" and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations".
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31,
                                                     --------------------------------------
                                                        1997          1996          1995
                                                     ----------    ----------    ----------
                                                             (DOLLARS IN THOUSANDS)
<S>                                                  <C>           <C>           <C>
STATEMENT OF OPERATIONS DATA:
Revenue............................................  $1,658,150    $1,418,108    $1,282,927
Operating profit...................................     200,619       147,446       134,903
Earnings from continuing operations before income
  taxes............................................     151,245       116,537       103,208
Earnings from continuing operations................      91,811        69,922        61,409
OTHER DATA:
EBITDA(1)..........................................  $  569,556    $  456,659    $  408,453
Ratio of EBITDA to interest expense(2).............        13.3          14.1          12.2
Ratio of earnings to fixed charges(3)..............         4.1           4.5           4.0
Capital expenditures and cost of multiclient
  seismic data acquired............................  $  705,027    $  475,475    $  323,483
Depreciation, depletion and amortization(4)........     368,937       309,213       273,550
BALANCE SHEET DATA (END OF PERIOD)(5):
Working capital....................................  $  114,164    $  774,954    $  827,526
Total assets.......................................   2,330,707     2,499,210     2,268,580
Total debt.........................................     808,122       503,644       498,813
Shareholders' equity...............................     886,867     1,502,938     1,356,847
</TABLE>
 
- ---------------
 
(1)  "EBITDA" means earnings from continuing operations before interest, taxes,
     depreciation, amortization, and non-recurring items and should not be
     considered as an alternative to net income or any other generally accepted
     accounting principles measure of performance as an indicator of the
     Company's operating performance or as a measure of liquidity. The Company
     believes EBITDA is a widely accepted financial indicator of a company's
     ability to service debt. EBITDA is not necessarily comparable to similarly
     titled measures of other companies.
 
(2)  Ratio of EBITDA to interest expense represents an industry ratio that
     provides an investor with information as to the Company's current ability
     to meet its financing costs.
 
(3)  For the purpose of this calculation, "earnings" consist of net income from
     continuing operations before income taxes plus fixed charges excluding
     capitalized interest. "Fixed charges" consist of interest expense,
     capitalized interest, amortization of deferred loan costs, and the portions
     of operating leases that management believes are representative of the
     interest factor thereon.
 
(4)  During the fourth quarter of 1997, the Company extended the estimated
     useful lives of certain assets. This change in accounting estimate resulted
     in an increase in the Company's earnings from continuing operations of $2.8
     million or $0.05 diluted earnings per share for 1997.
 
(5)  On October 31, 1997, the shares of common stock of UNOVA were distributed
     to the Company's shareholders in connection with the Spin-off.
 
                                        4
<PAGE>   10
 
                                USE OF PROCEEDS
 
     The net proceeds to be received by the Company from the sale of the Notes,
after deducting estimated underwriting discounts and expenses of this offering
payable by the Company, are expected to be $198.5 million. Concurrently with the
offering of Notes made hereby, the Company is also engaged in the Units Offering
from which the net proceeds (assuming the Units Offering is consummated) to be
received by the Company from the sale of the Units, after deducting estimated
underwriting discounts and expenses of the Units Offering payable by the
Company, are expected to be $387.4 million ($445.6 million if the underwriters'
over-allotment option in the Units Offering is exercised in full). The Company
intends to use the aggregate net proceeds from this Notes offering and the Units
Offering to fund the Acquisitions totaling approximately $333 million (assuming
100% of the shares of 3-D Geophysical are acquired in the 3-D Acquisition) and
to repay approximately $253 million of commercial paper and other borrowings
($311 million if the underwriters' over-allotment option in the Units Offering
is exercised in full). As of March 9, 1998, the Company's outstanding commercial
paper borrowings totaled $363 million and interest rates on such borrowings
ranged from 5.65% to 6.19% with an effective weighted average interest rate of
5.74%.
 
     Neither this Notes offering nor the Units Offering is conditioned upon the
consummation of the other offering. If only this Notes offering is consummated,
all of the $198.5 million in net proceeds from this Notes offering will be
applied to the $218 million purchase price in the Wedge Acquisition. In that
event, the Company will borrow the balance of such purchase price and the $115
million purchase price in the 3-D Acquisition under existing or new credit
facilities.
 
                                        5
<PAGE>   11
 
                                 CAPITALIZATION
 
     The following table sets forth the consolidated capitalization of the
Company at December 31, 1997 and as adjusted to reflect the sale by the Company
of the Notes offered hereby (at an assumed initial public offering price of
100%) and the sale by the Company of an aggregate of $400 million of the Units
in the Units Offering, and the application of the net proceeds therefrom, after
deducting estimated underwriting discounts and expenses of the offering made
hereby and the Units Offering. The capitalization information set forth in the
table below is qualified by, and should be read in conjunction with, the more
detailed consolidated financial statements and notes thereto incorporated by
reference herein. See "Use of Proceeds".
 
<TABLE>
<CAPTION>
                                                                  AT DECEMBER 31, 1997
                                                              ----------------------------
                                                                ACTUAL      AS ADJUSTED(1)
                                                              ----------    --------------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                                           <C>           <C>
Short-term debt.............................................  $  106,592      $  180,492(2)
Long-term debt
     % Senior Notes due 2008................................          --         200,000
  Other(3)..................................................     701,530         448,630
                                                              ----------      ----------
          Total debt........................................     808,122         829,122
                                                              ----------      ----------
Company-obligated, mandatorily redeemable capital securities
  of Western Atlas Capital Trust I holding solely Company
  debentures................................................  $       --      $  400,000
                                                              ----------      ----------
Shareholders' equity:
  Common stock -- $1.00 par value; 150,000,000 shares
     authorized, 54,587,518 shares issued and outstanding...  $   54,588      $   54,588
  Paid-in capital...........................................     685,283         685,283
  Retained earnings.........................................     150,502         150,502
  Pension liability adjustment..............................      (3,506)         (3,506)
                                                              ----------      ----------
          Total shareholders' equity........................     886,867         886,867
                                                              ----------      ----------
               Total capitalization.........................  $1,694,989      $2,115,989
                                                              ==========      ==========
</TABLE>
 
- ---------------
 
(1) As adjusted data assumes that of the $585.9 million ($644.1 million if the
    underwriters' over-allotment option in connection with the Units Offering is
    exercised in full) net proceeds raised pursuant to this Notes offering and
    the Units Offering, $333 million will be used to fund the Acquisitions and
    $253 million ($311 million if the underwriters' over-allotment option in the
    Units Offering is exercised in full) will initially be utilized to repay
    commercial paper and other borrowings. Subsequent to the offerings, the
    Company will re-borrow portions of the debt repaid hereunder to the extent
    that capital expenditures and expenditures for multiclient seismic data
    exceed available working capital and cash flow from operations.
 
(2) Includes $73.9 million of debt applicable to the Acquisitions which will be
    included in the Company's consolidated financial statements after the
    consummation of the Acquisitions. These amounts have been classified as
    short-term debt as the Company intends to refinance such debt with longer
    term debt.
 
(3) Consists of (i) commercial paper and other short-term notes payable, (ii)
    7.875% notes due 2004, (iii) 8.55% debentures due 2024, and (iv) other
    borrowings.
 
                                        6
<PAGE>   12
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The following table sets forth summary consolidated financial data for the
Company and its subsidiaries (i) as of and for the four years ended December 31,
1997, (ii) as of and for the five months ended December 31, 1993, and (iii) as
of and for the year ended July 31, 1993. The summary financial data have been
derived from the Company's audited consolidated financial statements as of
December 31, 1997 and 1996 and for each of the three years in the period ended
December 31, 1997 incorporated by reference herein. The following data should be
read in conjunction with the consolidated financial statements and notes thereto
incorporated by reference herein.
 
<TABLE>
<CAPTION>
                                                                                             FIVE MONTHS
                                                          YEAR ENDED DECEMBER 31,               ENDED       YEAR ENDED
                                                 -----------------------------------------   DECEMBER 31,    JULY 31,
                                                   1997       1996       1995       1994       1993(1)       1993(1)
                                                 --------   --------   --------   --------   ------------   ----------
                                                             (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                                              <C>        <C>        <C>        <C>        <C>            <C>
Operating results:
  Revenue......................................  $1,658.2   $1,418.1   $1,282.9   $1,194.5     $  495.2      $1,161.7
  Earnings (loss) from continuing operations...  $   91.8   $   69.9   $   61.4   $   39.7     $ (190.6)     $   40.8
  Earnings (loss) from discontinued
    operations(2)..............................    (154.9)      55.8       38.4       38.0          7.3          33.1
                                                 --------   --------   --------   --------     --------      --------
  Earnings (loss) before cumulative effect of a
    change in accounting principle.............     (63.1)     125.7       99.8       77.7       (183.3)         73.9
  Cumulative effect of a change in accounting
    principle(3)...............................        --         --         --         --           --          (1.1)
                                                 --------   --------   --------   --------     --------      --------
        Net earnings (loss)....................  $  (63.1)  $  125.7   $   99.8   $   77.7     $ (183.3)     $   72.8
                                                 ========   ========   ========   ========     ========      ========
Common share data -- diluted(4):
  Earnings (loss) per share from continuing
    operations.................................  $   1.65   $   1.29   $   1.14   $    .82     $  (4.18)     $    .87
  Earnings (loss) per share from discontinued
    operations(2)..............................     (2.78)      1.03        .72        .78          .16           .70
                                                 --------   --------   --------   --------     --------      --------
  Earnings (loss) per share before cumulative
    effect of a change in accounting
    principle..................................     (1.13)      2.32       1.86       1.60        (4.02)         1.57
  Cumulative effect of a change in accounting
    principle(3)...............................        --         --         --         --           --          (.02)
                                                 --------   --------   --------   --------     --------      --------
        Total..................................  $  (1.13)  $   2.32   $   1.86   $   1.60     $  (4.02)     $   1.55
                                                 ========   ========   ========   ========     ========      ========
Shares used to compute earnings (loss) per
  share(4).....................................      55.6       54.3       53.8       48.5         45.6          47.0
Financial position at period end:
  Total assets.................................  $2,330.7   $2,499.2   $2,268.6   $2,141.6     $2,007.5      $1,756.7
  Total debt...................................     808.1      503.6      498.8      531.7        771.1         185.4
  Shareholders' equity.........................     886.9    1,502.9    1,356.8    1,248.3        957.4       1,087.4
  Working capital..............................     114.2      775.0      827.5      729.0        752.4         714.7
  Current ratio................................       1.2        2.9        3.8        3.3          3.5           5.1
Other selected information:
  EBITDA(5)....................................  $  569.6   $  456.7   $  408.5   $  341.3     $   86.7      $  313.0
  Ratio of earnings to fixed charges(6)........       4.1        4.5        4.0        2.4           --           6.6
  Research and technology expenditures.........  $   59.2   $   54.8   $   59.8   $   59.1     $   28.2      $   61.7
  Depreciation, depletion, and
    amortization(7)............................     368.9      309.2      273.6      232.6         87.7         185.2
  Capital expenditures.........................     430.0      279.6      171.1      146.7        111.8         130.2
  Cost of multiclient seismic data acquired....     275.1      195.9      152.3      114.2         38.3          27.0
  Number of employees at period end............    10,600      9,100      8,500      8,900        7,800         8,800
</TABLE>
 
                                                 (See notes on following page)
 
                                        7
<PAGE>   13
 
- ---------------
 
(1) The Company became a publicly-traded company in March 1994, concurrent with
    the distribution of its common stock to the shareholders of Litton
    Industries, Inc. ("Litton"). The Company's fiscal year-end was changed from
    July 31 to December 31 in 1993. Interest expense, income taxes, and certain
    general and administrative corporate costs incurred by Litton were allocated
    to the Company for periods presented prior to January 1, 1994.
 
(2) On October 31, 1997, the shares of common stock of UNOVA were distributed to
    the Company's shareholders in connection with the Spin-off. UNOVA's
    operations through October 31, 1997 are reported in the Company's financial
    statements as discontinued operations. Accordingly, the accounts of UNOVA's
    operations were reclassified as earnings from discontinued operations.
    Corporate general and administrative costs of the Company were not allocated
    to UNOVA for any of the periods presented.
 
(3) The provisions of SFAS No. 106, Employer's Accounting for Postretirement
    Benefits Other Than Pensions, were adopted in fiscal year 1993. Immediate
    recognition of the transition liability was elected. All amounts pertain to
    continuing operations.
 
(4) The number of shares of common stock outstanding prior to 1994 was based on
    the weighted-average number of shares of Litton common stock outstanding for
    fiscal 1993.
 
(5) "EBITDA" means earnings from continuing operations before interest, taxes,
    depreciation, depletion, amortization, and non-recurring items and should
    not be considered as an alternative to net income or any other generally
    accepted accounting principles measure of performance as an indicator of the
    Company's operating performance or as a measure of liquidity. The Company
    believes EBITDA is a widely accepted financial indicator of a company's
    ability to service debt. EBITDA is not necessarily comparable to similarly
    titled measures of other companies.
 
(6) For the purpose of this calculation, "earnings" consist of net income from
    continuing operations before income taxes plus fixed charges excluding
    capitalized interest. "Fixed charges" consist of interest expense,
    capitalized interest, amortization of deferred loan costs, and the portions
    of operating leases that management believes are representative of the
    interest factor thereon. Earnings for the five months ended December 31,
    1993 were inadequate to cover fixed charges by $252.8 million.
 
(7) During the fourth quarter of 1997, the Company extended the estimated useful
    lives of certain assets. This change in accounting estimate resulted in an
    increase in the Company's earnings from continuing operations of $2.8
    million or $0.05 diluted earnings per share for 1997.
 
                                        8
<PAGE>   14
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     Management's discussion and analysis of financial condition and results of
operations should be read in conjunction with the Company's Consolidated
Financial Statements for the years ended December 31, 1997, 1996, and 1995 and
the related notes thereto incorporated by reference herein.
 
OVERVIEW
 
     On October 31, 1997, the Company effected the Spin-off. The operations of
UNOVA were reported in the Company's Consolidated Financial Statements as
discontinued operations. Accordingly, the accounts of these operations have been
reclassified as earnings from discontinued operations. See "-- Discontinued
Operations" below for a discussion of the Spin-off.
 
RESULTS OF CONTINUING OPERATIONS
 
     The Company's continuing operations discussed herein reflect the Company's
ongoing oilfield service-related businesses only. All references to earnings per
share are on a diluted basis unless specified otherwise.
 
  1997 COMPARED TO 1996
 
     Net earnings from continuing operations totaled $91.8 million, or $1.65 per
share, for the year ended December 31, 1997, an increase of 31% compared to 1996
net earnings of $69.9 million, or $1.29 per share.
 
     Total revenue for 1997 was $1,658.2 million, an increase of 17% over 1996
revenue of $1,418.1 million. Businesses acquired in 1997 contributed
approximately $26.6 million of the revenue improvement. Approximately 68% of the
Company's consolidated revenue was derived from international activities in
1997, compared to 70% in 1996. Consolidated international revenue increased 15%
in 1997 over 1996.
 
     Operating profit from continuing operations was $200.6 million in 1997
compared to $147.4 million in 1996. Approximately 60% of the Company's
consolidated operating profit was derived from international activities in 1997,
compared to 56% in 1996.
 
     WESTERN GEOPHYSICAL -- WG's 1997 revenue increased 17% and operating profit
increased 31% in 1997 compared to the prior year period. In addition to
improvements in the overall seismic market, seismic operations were favorably
impacted by the expansion of the ocean-bottom cable market, the emergence of the
4-D seismic market, the Company's proprietary development of new solid-streamer
technology for its marine seismic vessels, and advancements in data processing
technology.
 
     WALS -- WALS' revenue increased 17% and operating profit increased 36% in
1997 compared to the prior year. During 1997, WALS benefited from several
long-term contracts derived from the success of the Company's new logging
technologies. In addition, WALS focused on geographic expansion opportunities
during 1997 primarily in Latin America, the Middle East, Southeast Asia, and
Africa.
 
     E&PS -- During 1996 and 1997, E&PS did not have a portfolio of developed
prospects generating income. As a result, during 1996 and 1997, E&PS continued
to realize operating losses, including full cost ceiling impairments of $12.5
million in 1997 and $7.0 million in 1996, related to E&PS projects. The Company
is continuing to invest capital to develop this division and expects E&PS to
become profitable during 1998.
 
                                        9
<PAGE>   15
 
  1996 COMPARED TO 1995
 
     Net earnings from continuing operations totaled $69.9 million, or $1.29 per
share, for the year ended December 31, 1996, an increase of 14% compared to 1995
net earnings of $61.4 million, or $1.14 per share.
 
     Total revenue for 1996 was $1,418.1 million, an increase of 11% over 1995
revenue of $1,282.9 million. Approximately 70% of the Company's consolidated
revenue was derived from international activities in 1996, compared to 68% in
1995. Consolidated international revenue increased 13% in 1996 over 1995.
 
     Operating profit was $147.4 million in 1996 compared to $134.9 million in
1995. Approximately 56% of the Company's consolidated operating profit was
derived from international activities in 1996, compared to 64% in 1995.
 
     WESTERN GEOPHYSICAL -- WG revenue for 1996 increased 15% and operating
profit increased 14% over the prior year. Seismic operations benefited from a
number of highly successful multiclient geophysical surveys, the expansion of
its ocean-bottom cable acquisition and processing technology, and its growth in
the global land market.
 
     WALS -- WALS began to realize the benefits of introducing its
new-generation tools in 1996 with slightly higher revenue and operating profit
than in 1995. Revenue increased 6% over 1995 revenue. Operating profit increased
2% in 1996 compared to the prior year.
 
     E&PS -- During 1995 and 1996, the Company built the infrastructure
necessary to participate with clients on exploration and production projects in
the U.S. and internationally. Although revenue increased in 1996 compared to
1995, E&PS had operating losses in both 1996 and 1995. The operating loss in
1996 was due in part to full cost ceiling impairments of $7.0 million.
 
  GENERAL AND ADMINISTRATIVE EXPENSE
 
     General and administrative ("G&A") expense decreased as a percent of sales
from 5.1% in 1996 to 4.0% in 1997. Actual expenditures in 1997 were $66.8
million compared to $72.0 million in 1996. G&A expenses were consistent from
1995 to 1996.
 
  RESEARCH AND TECHNOLOGY
 
     Research and technology ("R&T") expense increased 8% in 1997 to $59.2
million compared to $54.8 million in 1996. For the year ended December 31, 1996,
R&T expense decreased $5.0 million, or 8%, compared to 1995.
 
  DEPRECIATION, DEPLETION, AND AMORTIZATION
 
     Depreciation, depletion, and amortization expense for 1997 increased $59.7
million, or 19%, over 1996. Expense increased $35.7 million, or 13%, from 1995
to 1996. Increased capital spending in both years raised the depreciable asset
bases for equipment and multiclient seismic data resulting in the higher
depreciation, depletion, and amortization expense. During the fourth quarter of
1997, the Company extended the estimated useful lives of certain assets to more
closely reflect management's current estimate of their expected lives. The
effect of this change in accounting estimate resulted in an increase in the
Company's earnings from continuing operations of $2.8 million, or $0.05 earnings
per share, for 1997.
 
  INTEREST EXPENSE
 
     Interest expense in 1997 increased $10.5 million from 1996 due to higher
average debt levels. Interest expense in 1996 was slightly lower than 1995 as
slightly higher average debt balances were offset by a slightly lower weighted
average interest rate.
 
                                       10
<PAGE>   16
 
  INCOME TAXES
 
     The effective income tax rate for continuing operations in 1997 was 39.3%
as compared to 40.0% in 1996 and 40.5% in 1995. The effective rates differ from
the federal statutory rates in all years due primarily to taxes on foreign
operations, the nondeductibility of goodwill amortization, and other
nondeductible expenses.
 
DISCONTINUED OPERATIONS
 
     Discontinued operations consist of the Company's industrial automation
systems business, UNOVA, up to the date of the Spin-off. Corporate general and
administrative costs of the Company were not allocated to UNOVA for any of the
periods presented. Management, however, estimates that approximately 85% of the
corporate general and administrative costs prior to the Spin-off were
attributable to UNOVA. Furthermore, Spin-off related costs of $8.35 million were
charged to continuing operations during the second quarter of 1997. Interest
expense attributable to UNOVA and therefore reclassified to discontinued
operations in the Company's Consolidated Statements of Operations totaled $17.2
million, $11.5 million, and $12.2 million for the years ended December 31, 1997,
1996, and 1995, respectively. Interest income attributable to UNOVA of $2.7
million, $4.4 million, and $2.8 million for the years ended December 31, 1997,
1996, and 1995, respectively, has also been reclassified to discontinued
operations.
 
LIQUIDITY, CAPITAL RESOURCES, AND FINANCIAL CONDITION
 
  OVERVIEW
 
     The Company ended 1997 with cash and cash equivalents of $33.5 million
compared with $16.3 million in 1996 and $13.2 million in 1995. During 1997, the
Company used approximately $206.9 million more cash than it generated from
operations. Major expenditures included $430.0 million for capital expenditures,
$275.1 million for acquisitions of multiclient seismic data, and $55.4 million
for business acquisitions. In addition, $66.7 million of cash was used to
finance working capital primarily for increases in accounts receivable. The
Company increased its net borrowings by $298.4 million primarily through its
commercial paper program. Shareholders' equity decreased $616.1 million due to
the Spin-off as offset by earnings during the year.
 
     Total debt was $808.1 million as of December 31, 1997, compared to $503.6
million at December 31, 1996. Total debt constituted approximately 48% and 25%
of total capitalization at the end of 1997 and 1996, respectively. Debt
increased in 1997 due primarily to acquisitions of industrial automation
businesses made before the Spin-off. The Company acquired Norand Corporation on
March 3, 1997 for $280 million and United Barcode Industries on April 4, 1997
for $107 million. These companies were integrated into the Company's industrial
automation systems operations and included in the Spin-off. Both transactions
were funded using a combination of committed credit facilities, short-term
uncommitted credit lines, and excess cash.
 
  STRATEGY
 
     During periods of growth, the Company has historically spent substantial
amounts for capital expenditures and acquisitions of multiclient seismic data in
order to remain competitive. The Company estimates that during 1998 it will
spend approximately $760 million for these purposes. The Company believes that
its current working capital resources, expected cash flow from operations, and
existing lines of credit will be sufficient to meet its 1998 needs for capital
expenditures and acquisitions of multiclient seismic data. In addition, the
Company may acquire complementary businesses as part of its long-term growth
strategy. The Company's capital needs with respect to business acquisitions may
exceed the Company's resources discussed above. Moreover, there is no assurance
that the Company will be able to finance such business acquisitions on terms it
finds acceptable and, in the event of a downturn in industry conditions, that
the capital resources discussed above will be adequate to meet the foregoing
capital needs.
 
                                       11
<PAGE>   17
 
ACCOUNTING STANDARDS
 
     In June 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards ("SFAS") No. 130, "Reporting
Comprehensive Income," which for the Company is effective in 1998. SFAS No. 130
establishes standards for the reporting and displaying of comprehensive income
and its components. The Company will analyze SFAS No. 130 during 1998 to
determine what, if any, additional disclosures will be required thereunder.
 
     The FASB issued in June 1997, SFAS No. 131, "Disclosures about Segments of
an Enterprise and Related Information," which establishes new requirements on
the reporting of information about operating segments, products and services,
geographic areas, and major customers. In February 1998, SFAS No. 132,
"Employers' Disclosures about Pensions and Other Postretirement Benefits," was
issued which revises required disclosures about pensions and postretirement
benefit plans. SFAS No. 131 and 132 are effective for the Company starting in
1998. The Company will analyze these pronouncements during 1998 to determine
what, if any, additional disclosures will be required thereunder.
 
YEAR 2000
 
     The Company is currently utilizing a combination of internal and external
resources to comprehensively identify and timely resolve the potential impact of
the year 2000 on the processing of date-sensitive information by the Company's
computerized information and support systems. The year 2000 problem is the
result of software that uses two digits (rather than four) to define the
applicable year. Any software or hardware that utilizes time-sensitive coding
may recognize a date using "00" as the year 1900 rather than the year 2000,
which could result in miscalculations or system failures. Based on preliminary
information, costs of addressing potential problems are not currently expected
to have a material adverse impact on the Company's financial position, results
of operations, or cash flows in future periods. If, however, the Company, its
customers, or vendors are unable to adequately resolve such processing issues in
a timely manner, the Company's operations and financial results may be adversely
affected.
 
                                       12
<PAGE>   18
 
                                    BUSINESS
 
     The Company is a leading supplier of oilfield services and reservoir
information technologies for the worldwide oil and gas industry. It operates
primarily through three divisions: Western Geophysical, Western Atlas Logging
Services, and E&P Services. The Company specializes in land, marine and
transition-zone seismic data acquisition and processing services; open-hole and
cased-hole well-logging services; reservoir characterization; and exploration
and production techniques and management services. The Company's revenues have
grown from approximately $1.4 billion in 1996 to approximately $1.7 billion in
1997, an increase of 17%. During this period, EBITDA grew from approximately
$457 million to approximately $570 million, an increase of 25%. For the year
ended December 31, 1997, the Company's international activity generated revenue
and operating profit of $1.1 billion and $119 million, respectively. Domestic
activity produced revenue and operating profit of $529 million and $82 million,
respectively.
 
     The Company, through its predecessors, has provided services to the oil and
gas industry since 1932 and was incorporated in Delaware as a wholly-owned
subsidiary of Litton in 1984. The Company became a publicly-traded company in
March 1994, concurrent with the distribution of its common stock to the
shareholders of Litton in a tax-free spin-off. On October 31, 1997, Western
Atlas distributed all of the shares of UNOVA, its then wholly-owned industrial
automation systems subsidiary, as a stock dividend to the Company's shareholders
in the Spin-off. As a result of the Spin-off, UNOVA became an independent
publicly-traded company.
 
     The Company's strategy is to maximize shareholder value by providing
value-added solutions to its customers, maintaining operational excellence, and
pursuing internal and external growth opportunities. The Company's reservoir
information services enable customers to more quickly locate hydrocarbons,
reduce exploration, development, and production risks, and maximize returns.
Western Atlas intends to enhance its significant market positions in its core
businesses by continuing to invest substantial amounts of intellectual and
financial capital into new services, products, and technologies.
 
  WESTERN GEOPHYSICAL
 
     The Company is a leading provider of seismic exploration and production
services throughout the world. In recent years, Western Atlas has advanced
seismic technology to accurately delineate subtle anomalies and break through
barriers such as salt bodies and unconsolidated sediments, providing more
detailed geological information. On a worldwide basis, Western Atlas offers the
most advanced fleet of purpose-built seismic vessels for deepwater streamer and
OBC exploration, the industry's largest land-crew organization for all-terrain
surveys, and innovative technologies for seamless coverage across shallow-water
transition zones. The Company processes field data using a combination of
on-site facilities and an extensive global network of computer centers.
 
     In October 1997, the Company acquired all of the outstanding stock of
GeoSignal, Inc., a seismic data processing company, and Seismic Resources, Inc.,
a provider of multiclient seismic data, in exchange for stock of the Company.
 
     WG's seismic exploration and production services are described in more
detail below:
 
     Advanced Deepwater Fleet. WG was the first in the industry to deploy a new
class of super-seismic vessels to meet the high-volume, high-resolution needs of
large-scale 3-D surveys. These vessels are equipped with enhanced streamer
deployment capability for increased productivity, which is particularly
important for the short seismic shooting season in the North Sea. In the Gulf of
Mexico, where long offsets are needed for subsalt imaging, the Company's vessels
are towing record streamer deployments. The vessels include the state-of-the-art
MIDAS(SM) system for automated task handling, fully integrated onboard
processing, and remote control through a high-speed satellite data link. The
extension of processing capabilities to the field facilitates on-site quality
control and more rapid delivery of interpretable seismic data.
 
                                       13
<PAGE>   19
 
     All-Terrain Land Surveys. WG has conducted land surveys throughout most oil
and gas producing regions of the world. The Company's decentralized management
structure enables its personnel to satisfy customer requirements by combining
presurvey planning, energy sources, advanced data recording systems, and infield
data processing. As a result, Western Atlas is able to provide high quality
seismic data for the largest 3-D surveys in the Middle East as well as short
lines in Canada. Field practices are designed to comply with applicable health,
safety, and environmental standards.
 
     OBC and Transition-Zone Expertise. The Company is a leading provider of OBC
technology. Western Atlas uses the OBC method to complement streamer surveys in
water depths to 150 meters. In conjunction with the OBC surveys, the Company's
acquisition of proprietary Dual Sensor(SM) processing provides high quality data
by processing the combined hydrophone and geophone signals, cancelling multiple
reflections, and recording the widest bandwidth in the industry. In transition
zones such as marshlands and swamps, the Company's innovative survey designs and
operations experience have achieved high-quality, seamless coverage in some of
the world's most difficult areas, thereby enabling oil and gas companies to
discern hydrocarbon indicators and drill wells with increased probability of
success.
 
     Multicomponent Surveys. The Company is at the forefront of multicomponent
surveys to acquire both compressional (P) and shear (S) wave seismic data. On
land, 3-component geophones are used. In the marine environment, a hydrophone is
added to each receiver station to create a 4-component data acquisition system.
The Company then uses Dual Sensor processing to remove water-bottom multiples
and increase the dynamic range of the P-wave data. By acquiring S-wave data as a
supplement to P-wave data, the Company is able to distinguish between lithology
and pore fluid effects, allowing for enhanced reservoir characterization, and
thereby reducing exploration risk. S-wave data also aid in determining the
density and orientation of fractures.
 
     Software Solutions. WG has developed a comprehensive seismic software
library to provide advanced data processing solutions for a wide variety of
geologic environments and field conditions. The acquisition of GeoSignal, Inc.
increased the Company's portfolio of seismic refraction processing software.
This software incorporates the latest developments in geophysical research and
reflects continual improvements based on practical experience. The Company
licenses this software to a variety of customers, including oil companies and
national petroleum agencies.
 
     3-D Depth Imaging. Western Atlas has developed the technical expertise to
image complex geologic formations. The Company's resources -- geophysical
research, state-of-the-art parallel computers, and 3-D visualization
technology -- provide cost-effective techniques for depth imaging reservoirs
beneath faults, salt intrusions, and other obstructions.
 
     Spec Data Library and Data Storage. WG has accumulated the industry's
largest databank of non-exclusive data for oil and gas prospects throughout the
world, including extensive 3-D surveys in the Gulf of Mexico and the North Sea.
This database offers prospective purchasers of oil and gas properties and other
customers extensive information for evaluating properties. The database was
enlarged through the acquisition of Seismic Resources, Inc., which specializes
in non-exclusive surveys in the Mississippi Delta region. In addition, the
Company has secure data storage and computerized data management services.
 
     4-D Advantage. Reservoir monitoring by the integration of time-lapse or 4-D
seismic surveys offers the potential for improving understanding of hydrocarbon
recovery. WG has developed full-service resources for 4-D monitoring through
years of research, operational experience throughout the world, and the
acquisition of the latest 4-D software technology, including software from EnTec
Energy Consultants, Ltd., for integrated reservoir studies and the
industry-leading Lamont 4-D(TM*) software for tracking fluid movement.
 
- ---------------
 
* Lamont 4-D is a trademark of Columbia University. Western Atlas uses it under
  exclusive license.
                                       14
<PAGE>   20
 
WESTERN ATLAS LOGGING SERVICES
 
     Since 1932, WALS has helped petroleum companies improve the economics of
exploration and production operations by building a geoscientific knowledge base
about their wells and reservoirs. With the increased importance of using
downhole data to locate pay zones and produce hydrocarbons cost effectively,
Western Atlas has developed a new generation of geoscience data acquisition and
integrated data analysis systems. To help derive the maximum benefits of these
new technologies, Western Atlas has created a worldwide network of geoscience
centers staffed by geologists, geophysicists, and reservoir engineers with
practical project experience in reducing risks and increasing hydrocarbon
reserves. WALS conducts operations in all types of drilling and production
environments, including highly deviated and extended-reach wells.
 
     In May 1997, the Company acquired Sungroup Energy Services Company, a
Canadian well-logging, production testing, and completion services provider.
Additionally, in December 1997, the Company acquired Heartland Kingfisher Inc.,
a Canadian well-logging company. ParaMagnetic Logging, Inc., a well-logging
research company, was acquired in October 1997 in exchange for stock of the
Company. These acquisitions are expected to provide growth opportunities for the
Company in the cased-hole logging and perforating markets.
 
     Specific types of services provided by WALS include:
 
     Formation Evaluation. WALS' formation evaluation services provide key
information to help clients better understand and manage reservoirs. This
information includes hydrocarbon saturation, porosity, permeability, pay
thickness, mechanical rock properties, and formation productivity. This
information can also be used as benchmarks for future comparisons in monitoring
production and optimizing recovery.
 
     Petrophysical Analysis. WALS uses advanced petrophysical data analysis to
help quantify pay zones in reservoirs ranging from thin-bed clastics and
low-resistivity contrast formations to fractured carbonates. These services
include imaging and analyzing an extensive range of productive zones in
developed fields and exploration wells. The resulting petrophysical analyses can
be readily integrated with other geoscientific information to improve reservoir
economics.
 
     Downhole Seismic Services. WALS offers a wide range of borehole and
cross-well seismic services, including reservoir connectivity mapping, vertical
seismic profiles, velocity surveys, saltdome imaging, and
seismic-while-drilling, for both exploration and field development applications.
 
     Completion Services. WALS' completion technologies are designed to help
optimize production. Services include cement evaluation, perforating,
mechanical, pressure-control services and correlation logs. WALS' trained
engineers work with customers to plan and conduct well completion operations
taking into account safety and environmental guidelines.
 
     Reservoir Monitoring. WALS' reservoir monitoring technologies enable
customers to monitor reserves, assess the need for remedial services, and
evaluate enhanced recovery operations. WALS establishes the production baseline
through evaluation logs, casing inspection and production logs. WALS can
thereafter monitor changes in the well or reservoir through subsequent logging
and inspection.
 
     Geoscience Services. Western Atlas has established geoscience centers in
strategic locations throughout the world, where specialists in geology,
geophysics, petrophysics, reservoir engineering, and related fields apply
advanced techniques in an integrated environment to help clients cut costs,
reduce risks, increase production, and improve recovery.
 
  E&P SERVICES
 
     E&PS seeks clients and partners for oil and gas exploration and production
opportunities who will value the subsurface information technologies that E&PS
possesses to exploit the full potential
                                       15
<PAGE>   21
 
of hydrocarbon bearing properties. E&PS is organized into multidisciplinary
project teams of geophysicists, geologists, and reservoir engineers that offer a
wide range of experience in exploration and production techniques, including
integrated geoscience subsurface analysis, reservoir characterization, economic
and risk analysis, drilling recommendations, and project management and
implementation. E&PS was started in 1995 as a provider of value-added consulting
services to clients, typically on a fee basis. The division currently provides
services to clients on a fee basis as well as invests financial and intellectual
capital into client projects on a shared-risk and/or partnered basis.
 
MARKET AND CUSTOMERS
 
     The market for the Company's products and services is the worldwide oil and
gas industry. The Company has hundreds of customers consisting primarily of oil
and gas exploration and production companies, including large integrated oil and
gas entities, smaller independent companies, and government organizations. The
customer base is diversified with no single customer representing more than 10%
of the Company's revenue. The Company's top five customers constitute
approximately 21% of the Company's revenue.
 
     Demand for the Company's services depends upon the level of spending by oil
and gas companies for exploration, production, development, and field management
activities. These activities depend in part on current and expected oil and gas
prices, the cost of exploring for, producing and delivering oil and gas, the
sale and expiration dates of leases and concessions for oil and gas exploration,
the discovery rate of new oil and gas reservoirs, domestic and international
political, regulatory and economic conditions, and the ability of oil and gas
companies to obtain capital. In addition, a decrease in oil and gas expenditures
could result from such factors as unfavorable tax and other legislation or
uncertainty concerning national energy policies. Prices for oil and gas are
subject to wide fluctuations in response to relatively minor changes in the
supply of and demand for oil and gas, market uncertainty, political conditions
in the Middle East and other oil producing regions of the world, the foreign
supply of oil and gas, and overall economic conditions. A further decline in oil
and gas prices or the continuation of current pricing conditions for an extended
period of time could cause the Company's customers to alter their spending plans
and result in a significant reduction in the demand for the Company's services.
 
COMPETITION
 
     Competition in the seismic services market ranges from a few larger
companies with a broad spectrum of services, to smaller companies targeting
narrow market segments. Major competitors to WG in the seismic market are:
Geco-Prakla (a division of Schlumberger Limited), Compagnie Generale de
Geophysique, and Petroleum Geo-Services ASA. The Company believes WG is the
largest participant in this market, measured by revenue. In addition, there are
numerous smaller competitors. Competition in the oilfield logging services
market ranges from a few larger companies with a broad spectrum of services, to
numerous smaller companies targeting narrow market segments. The Company's
largest competitors in this market include Schlumberger Limited and Halliburton
Company. The Company believes WALS has the second largest revenue share of this
market. The Company believes seismic and logging projects are won primarily on
the basis of price, technology, quality, service, turnaround time, and
availability of personnel and equipment.
 
METHODS OF DISTRIBUTION
 
     The Company principally markets its products and services directly to its
customers on a global basis.
 
                                       16
<PAGE>   22
 
RAW MATERIALS
 
     WALS' manufacturing operations design, develop, and manufacture most of the
proprietary tools and instruments used by WALS to provide its services. A wide
variety of raw materials are used in the manufacture of these products which are
obtained from a variety of suppliers. No single supplier provides 10% or more of
the Company's raw materials. The Company believes that it could make
satisfactory alternative arrangements in the event of interruption in the supply
of such materials.
 
INTELLECTUAL PROPERTY
 
     The Company owns significant intellectual property relating to its products
and services that has been secured over a period of years. This intellectual
property has been of value in the growth of the Company's business and is
expected to be of value in the future. However, the Company's business generally
is not dependent upon the protection of any single item or small number of items
of intellectual property, and would not be materially affected by the expiration
or termination of any single item or small number of items of intellectual
property.
 
RESEARCH AND TECHNOLOGY
 
     Direct expenditures on R&T activities amounted to $59.2 million, $54.8
million, and $59.8 million in the years ended December 31, 1997, 1996, and 1995,
respectively.
 
SEASONALITY AND BACKLOGS
 
     Although the Company's operations in any particular geographic area may be
affected by seasonal factors, the global nature of its operations tends to
reduce overall seasonal effects. Because the Company's revenue is predominantly
service related, the Company does not consider backlog to be a significant
measure of future sales.
 
ENVIRONMENTAL MATTERS
 
     During the fiscal year ended December 31, 1997, the amounts incurred in
complying with laws and regulations pertaining to environmental standards did
not have a material effect upon the Company's cash flows or earnings.
 
EMPLOYEES
 
     As of December 31, 1997, the Company had approximately 10,600 full-time
employees.
 
                                       17
<PAGE>   23
 
                                   MANAGEMENT
 
     The following table lists the current directors and executive officers of
the Company:
 
<TABLE>
<CAPTION>
                                     AGE                        TITLE
                                     ---                        -----
<S>                                  <C>   <C>
John R. Russell...................   59    President & Chief Executive Officer and Director
William H. Flores.................   44    Senior Vice President and Chief Financial
                                           Officer
James E. Brasher..................   49    Senior Vice President, General Counsel and
                                             Assistant Secretary
Orval F. Brannan..................   58    Senior Vice President
Damir S. Skerl....................   58    Senior Vice President
Richard C. White..................   42    Senior Vice President and President of WG
Gary E. Jones.....................   43    Vice President and President of WALS
Paul Bancroft III.................   68    Director
Alton J. Brann....................   56    Director and Chairman of the Board
Joseph T. Casey...................   66    Director
William C. Edwards................   69    Director
Claire W. Gargalli................   55    Director
Orion L. Hoch.....................   69    Director
</TABLE>
 
     JOHN R. RUSSELL has served as President and Chief Executive Officer of the
Company since October 1997 and is currently a member of the Executive and
Nominating Committees. Mr. Russell served as Executive Vice President and Chief
Operating Officer of the Oilfield Services group of the Company from 1990 until
October 1997. From 1991 to 1994, Mr. Russell served as Senior Vice President of
Litton Industries, Inc. and as Chief Executive Officer of Western Atlas
International, Inc. a wholly owned subsidiary of the Company ("WAII").
 
     WILLIAM H. FLORES has served as Senior Vice President and Chief Financial
Officer of the Company since October 1997 and Chief Financial Officer of WAII
since August 1997. From 1990 to 1997, Mr. Flores served as a director and as
Senior Vice President and Chief Financial Officer, and from 1996 to 1997 he
served as Executive Vice President, of Marine Drilling Companies, Inc.
 
     JAMES E. BRASHER has served as Senior Vice President and General Counsel of
the Company since October 1997. From 1994 to 1997, Mr. Brasher served as Vice
President and Group Counsel of WAII, and from 1987 to 1994 he served as
Secretary and General Counsel of WAII.
 
     ORVAL F. BRANNAN has served as Senior Vice President of the Company since
1994 and President of E&PS since 1995. Mr. Brannan served as Senior Vice
President of WAII since 1992 and President of WG from 1991 to 1995. Mr. Brannan
serves as the Chairman of the Board of Directors of PetroAlliance Services
Company Ltd., a 50% owned subsidiary of the Company that provides oilfield
services in the former Soviet Union.
 
     DAMIR S. SKERL has served as Senior Vice President of the Company since
1994. In addition, Mr. Skerl served as President of WALS from 1992 to 1997.
 
     RICHARD C. WHITE has served as Senior Vice President of the Company since
May 1996 and President of WG since 1995. From 1995 to 1996, Mr. White served as
Vice President of the Company. In addition, from 1994 to 1995, he served as
Chief Operating Officer of WG and in 1993 as Senior Vice President of the
Company's North and South American Operations.
 
     GARY E. JONES has served as Vice President of the Company and President of
WALS since 1997. From 1996 to 1997, Mr. Jones served as Vice President of
Business Development of WAII and from 1992 to 1996 as Vice President of Latin
America Operations of WG.
 
     PAUL BANCROFT, III has served as a director of the Company since 1994 and
is currently Chairman of the Compensation Committee and a member of the Audit
and Compliance and Nominating Committees. Mr. Bancroft served as President,
Chief Executive Officer, and a director of Bessemer
 
                                       18
<PAGE>   24
 
Securities Corporation from 1976 until 1988. Currently, he is an independent
venture capitalist and consultant and a director of several investment funds
sponsored by Scudder, Kemper Investments.
 
     ALTON J. BRANN has served as Chairman of the Board and a director of the
Company since 1994 and is currently the Chairman of the Executive Committee and
a member of the Audit and Compliance and Nominating Committees. From 1994 to
October 1997, Mr. Brann served as Chief Executive Officer of the Company. Mr.
Brann has served as Chairman of the Board and Chief Executive Officer of UNOVA
since October 1997. From 1990 and 1992, respectively, he served as President and
Chief Executive Officer of Litton. Mr. Brann is a director and Chairman of the
Executive Committee of the Board of Directors of Litton.
 
     JOSEPH T. CASEY has served as a director of the Company since 1994 and is
currently a member of the Executive and Nominating Committees. Mr. Casey served
as Vice Chairman and Chief Financial Officer of both the Company and Litton from
1994 and 1988, respectively, until his retirement in September 1996. He is
currently a director of Litton and of PSI, Inc. Mr. Casey has served as a
consultant to the Company since October 1996.
 
     WILLIAM C. EDWARDS has served as a director of the Company since 1994 and
is currently the Chairman of the Nominating Committee and member of the Audit
and Compliance and Compensation Committees. Mr. Edwards is Chairman of the Board
of Xeruca Corporation and director of Trust Company of the West and CellNet Data
Systems. He is also a director and treasurer of Population Action International.
 
     CLAIRE W. GARGALLI has served as a director of the Company since 1994 and
is currently the Chairperson of the Audit and Compliance Committee and member of
both the Compensation and Nominating Committees. Since 1990, Ms. Gargalli has
served as the Vice Chairman of Diversified Search and Diversified Health Search
Companies, executive search consulting firms, and is a director of Praxair, Inc.
and of Renal Treatment Centers.
 
     ORION L. HOCH has served as a director of the Company since 1994 and is
currently a member of the Nominating Committee. Dr. Hoch served as Chief
Executive Officer of Litton from 1988 to 1994 and as Chairman of the Executive
Committee of UNOVA since October 1997. He is currently a director of Litton,
Bessemer Trust Company, Woodbridge, New Jersey, and of Bessemer Trust Company,
N.A., New York.
 
                                       19
<PAGE>   25
 
                            DESCRIPTION OF THE NOTES
 
GENERAL
 
     The Notes will be issued as general unsecured, unsubordinated obligations
of the Company. The Notes will be limited to $200 million aggregate principal
amount and will mature on             , 2008.
 
     The Notes will bear interest from             , 1998, payable semi-annually
in arrears on each           and           , commencing             , 1998, at
the rate set forth on the cover page of this Prospectus to the persons in whose
names the Notes are registered at the close of business on the next preceding
          and           , respectively.
 
     The Notes will be issued under an Indenture dated as of             , 1998
(the "Indenture") between the Company and Chase Manhattan Bank and Trust
Company, National Association, as trustee (the "Trustee"). The statements under
this caption relating to the Notes are summaries only and do not purport to be
complete and are subject to, and are qualified in their entirety by reference
to, all of the provisions of the Indenture, including the definitions therein. A
copy of the form of the Indenture is filed as an exhibit to the Registration
Statement of which this Prospectus is a part. See "Available Information".
Certain capitalized terms used below and not defined herein have the respective
meanings assigned to them in the Indenture. As used in this section "Description
of the Notes", the term "Company" shall mean Western Atlas Inc., the issuer of
the Notes, and the term "Subsidiary" shall mean a corporation more than 50% of
the outstanding voting stock of which is owned, directly or indirectly, by the
Company or by one or more other Subsidiaries, or by the Company and one or more
other Subsidiaries.
 
     The Notes will not be entitled to the benefit of any sinking fund or other
mandatory redemption provisions.
 
RANKING
 
     The Notes will rank pari passu with all existing unsecured, unsubordinated
indebtedness of the Company. The Notes will be junior in right of payment to all
of the Company's secured obligations (insofar as the assets securing such
obligations are concerned). In addition, the rights of creditors of the Company,
including the Holders of the Notes, to participate in the assets of any
Subsidiary upon such Subsidiary's liquidation or recapitalization, will be
subject to prior claims of such Subsidiary's creditors. Substantially all of the
assets of the Company are owned by Subsidiaries.
 
OPTIONAL REDEMPTION
 
     The Notes may be redeemed at any time at the option of the Company, in
whole or in part, upon not less than 30 and not more than 60 days' notice mailed
to each Holder of Notes to be redeemed at the Holder's address appearing in the
Notes Register, on any date prior to maturity (the "Redemption Date") at a price
equal to 100% of the principal amount thereof plus accrued interest to the
Redemption Date (subject to the right of Holders of record on the relevant
record date to receive interest due on an interest payment date that is on or
prior to the Redemption Date) plus a Make-Whole Premium, if any (the "Redemption
Price"). In no event will the Redemption Price be less than 100% of the
principal amount of the Notes plus accrued interest to the Redemption Date.
 
     The amount of the Make-Whole Premium with respect to any Note (or portion
thereof) redeemed will be equal to the excess, if any, of:
 
          (i) the sum of the present values, calculated as of the Redemption
     Date, of:
 
             A. each interest payment that, but for such redemption, would have
        been payable on the Note (or portion thereof) redeemed on each Interest
        Payment Date occurring after the
 
                                       20
<PAGE>   26
 
        Redemption Date (excluding any accrued interest for the period prior to
        the Redemption Date); and
 
             B. the principal amount that, but for such redemption, would have
        been payable at the final maturity of the Note (or portion thereof)
        redeemed;
 
over
 
          (ii) the principal amount of the Note (or portion thereof) redeemed.
 
     The present values of interest and principal payments referred to in clause
(i) above will be determined in accordance with generally accepted principles of
financial analysis. Such present values will be calculated by discounting the
amount of each payment of interest and principal from the date that each such
payment would have been payable, but for the redemption, to the Redemption Date
at a discount rate equal to the Treasury Yield (as defined below) plus 15 basis
points.
 
     The Make-Whole Premium will be calculated by an independent investment
banking institution of national standing appointed by the Company, provided,
that if the Company fails to make such appointment at least 45 business days
prior to the Redemption Date, or if the institution so appointed is unwilling or
unable to make such calculation, such calculation will be made by Goldman, Sachs
& Co. or, if such firm is unwilling or unable to make such calculation, by an
independent investment banking institution of national standing appointed by the
Trustee (in any such case, an "Independent Investment Banker").
 
     For purposes of determining the Make-Whole Premium, "Treasury Yield" means
a rate of interest per annum equal to the weekly average yield to maturity of
United States Treasury Notes that have a constant maturity that corresponds to
the remaining term to maturity of the Notes, calculated to the nearest 1/12th of
a year (the "Remaining Term"). The Treasury Yield will be determined as of the
third business day immediately preceding the applicable Redemption Date.
 
     The weekly average yields of United States Treasury Notes will be
determined by reference to the most recent statistical release published by the
Federal Reserve Bank of New York and designated "H.15(519) Selected Interest
Rates" or any successor release (the "Statistical Release"). If the Statistical
Release sets forth a weekly average yield for United States Treasury Notes
having a constant maturity that is the same as the Remaining Term, then the
Treasury Yield will be equal to such weekly average yield. In all other cases,
the Treasury Yield will be calculated by interpolation, on a straight-line
basis, between the weekly average yields on the United States Treasury Notes
that have a constant maturity closest to and greater than the Remaining Term and
the United States Treasury Notes that have a constant maturity closest to and
less than the Remaining Term (in each case as set forth in the Statistical
Release). Any weekly average yields so calculated by interpolation will be
rounded to the nearest 1/200th of 1%, with any figure of 1/200th of 1% or above
being rounded upward. If weekly average yields for United States Treasury Notes
are not available in the Statistical Release or otherwise, then the Treasury
Yield will be calculated by interpolation of comparable rates selected by the
Independent Investment Banker.
 
     If less than all of the Notes are to be redeemed, the Trustee will select
the Notes to be redeemed by such method as the Trustee shall deem fair and
appropriate. The Trustee may select for redemption Notes and portions of Notes
in amounts of $1,000 or whole multiples of $1,000.
 
CERTAIN COVENANTS
 
  LIMITATIONS ON LIENS
 
     The Indenture provides that the Company will not create, assume or suffer
to exist any Lien (as defined below) on any Restricted Property (as defined
below) to secure any debt of the Company, any Subsidiary or any other Person, or
permit any Subsidiary so to do, without securing the Notes
 
                                       21
<PAGE>   27
 
equally and ratably with such debt for so long as such debt is so secured. The
foregoing restriction does not apply, however, to the following: (1) Liens
existing on the date of issuance of the Notes; (2) Liens on Restricted Property
of Subsidiaries at the time they become Subsidiaries; (3) Liens existing on
Restricted Property when acquired; (4) any Lien to secure any debt incurred
prior to, at the time of, or within 24 months after the acquisition of
Restricted Property for the purpose of financing all or any part of the purchase
price thereof and any Lien to the extent that it secures debt which is in excess
of such purchase price and for the payment of which recourse may be had only
against such acquired Restricted Property; (5) any Lien to secure any debt
incurred prior to, at the time of, or within 24 months after the completion of
the construction and commencement of commercial operation, alteration, repair or
improvement of Restricted Property for the purpose of financing all or any part
of the cost thereof and any Lien to the extent that it secures debt which is in
excess of such cost and for the payment of which recourse may be had only
against such Restricted Property; (6) any Lien securing debt of a Subsidiary
owing to the Company or to another Subsidiary; (7) Liens on the stock,
partnership or other equity interest of the Company or any Subsidiary in any
Joint Venture (as defined below) to secure debt, provided the amount of such
debt is contributed and/or advanced solely to such Joint Venture; (8) any Lien
in favor of the United States of America or any State thereof or any other
country, or any agency, instrumentality or political subdivision of any of the
foregoing, to secure partial, progress, advance or other payments or performance
pursuant to the provisions of any contract or statute, or any Liens securing
industrial development, pollution control or similar revenue bonds; (9) Liens
imposed by law, such as mechanics', workers', repairmen's, materialmen's,
carriers', vendors' or other similar Liens arising in the ordinary course of
business, or governmental (federal, state or municipal) Liens arising out of
contracts for the sale of products or services by the Company or any Subsidiary,
or deposits or pledges to obtain the release of any of the foregoing; (10)
certain pledges or deposits under workers' compensation or similar legislation
or in certain other circumstances; (11) certain Liens in connection with legal
proceedings, including certain Liens arising out of judgments or awards; (12)
Liens for certain taxes or assessments; (13) any extension, renewal or
replacement (or successive extensions, renewals or replacements) in whole or in
part of any Lien referred to in clauses (1) through (12) above, so long as the
principal amount of the debt secured thereby does not exceed the principal
amount of debt so secured at the time of the extension, renewal or replacement
(except that, where an additional principal amount of debt is incurred to
provide funds for the completion of a specific project, the additional principal
amount, and any related financing costs, also may be secured by the Lien) and
the Lien is limited to the same property subject to the Lien so extended,
renewed or replaced (plus improvements on the property); and (14) Liens
otherwise prohibited by this covenant securing debt that, together with the
aggregate amount of outstanding debt secured by Liens otherwise prohibited by
this covenant and the value of certain Sale and Leaseback Transactions (as
defined below), do not exceed 15% of the Company's Consolidated Net Tangible
Assets (as defined below).
 
  LIMITATION ON SALE AND LEASEBACK TRANSACTIONS
 
     The Indenture provides that the Company will not, and will not permit any
Subsidiary to, enter into any Sale and Leaseback Transaction (as defined below)
covering any Restricted Property unless (1) the Company would be entitled under
the provisions described under "Limitations on Liens" above to incur debt equal
to the value of such Sale and Leaseback Transaction, secured by Liens on the
property to be leased, without equally and ratably securing the Notes, or (2)
after the date on which the Notes are originally issued and within a period
commencing nine months prior to the effective date of such Sale and Leaseback
Transaction and ending nine months after such effective date, the Company or
such Subsidiary shall have expended, for Restricted Property used or to be used
in the ordinary course of business of the Company and its Subsidiaries, an
amount equal to all or a portion of the value of such Sale and Leaseback
Transaction and the Company shall have elected to designate such amount as a
credit against such Sale and Leaseback Transaction (with any such amount not
being so designated to be applied as set forth in clause (3) below or as
 
                                       22
<PAGE>   28
 
otherwise permitted); or (3) the Company during the nine months following the
effective date of such Sale and Leaseback Transaction, shall have applied either
an amount equal (a) to the value of such Sale and Leaseback Transaction to the
voluntary retirement of long-term debt or (b) to the acquisition of Restricted
Property (in either case adjusted to reflect the remaining term of the lease and
any amount expended by the Company as set forth in clause (2) above).
 
  CONSOLIDATION, MERGER AND SALE OF ASSETS
 
     The Company, without the consent of any Holders of outstanding Notes, may
consolidate with or merge into, or convey, transfer or lease its assets
substantially as an entirety to, any Person, provided that (i) the Person formed
by such consolidation or into which the Company is merged or that acquires or
leases the assets of the Company substantially as an entirety is a Person that
expressly assumes by supplemental indenture the Company's obligations on the
Notes and under the Indenture, (ii) after giving effect to the transaction, no
Event of Default and no event that, after notice or lapse of time or both, would
become an Event of Default shall have occurred and be continuing, and (iii)
certain other conditions are met. Upon compliance with these provisions by a
successor Person, the Company will (except in the case of a lease) be relieved
of its obligations under the Indenture and the Notes.
 
  DEFINITIONS
 
     "Consolidated Net Tangible Assets" means the total amount of assets (less
applicable reserves and other properly deductible items) after deducting (1) all
current liabilities (excluding the amount of those which are by their terms
extendable or renewable at the option of the obligor to a date more than 12
months after the date as of which the amount of current liabilities is being
determined) and (2) all goodwill, trade names, trademarks, patents, unamortized
debt discount and expense and other like intangible assets, all as set forth on
the most recent balance sheet of the Company and its consolidated subsidiaries
and determined in accordance with generally accepted accounting principles.
 
     "Joint Venture" means any partnership, corporation or other entity, in
which up to and including 50% of the partnership interests, outstanding voting
stock or other equity interests is owned, directly or indirectly, by the Company
and/or one or more Subsidiaries. A Joint Venture shall not be a Subsidiary.
 
     "Lien" means any mortgage, pledge, lien, encumbrance, charge or security
interest.
 
     "Restricted Property" means (i) any vessel, or portion thereof, owned or
leased by the Company or any Subsidiary and used for offshore activities, which,
in the opinion of the Board of Directors, is of material importance to the
business of the Company and its Subsidiaries taken as a whole, but no such
vessel, or portion thereof, shall be deemed to be of material importance if its
gross book value (before deducting accumulated depreciation) is less than 1.5%
of Consolidated Net Tangible Assets, or (ii) any shares of capital stock or
indebtedness of any Subsidiary owning any such vessel.
 
     "Sale and Leaseback Transaction" means any arrangement with any Person
pursuant to which the Company or any Subsidiary leases any Restricted Property
that has been or is to be sold or transferred by the Company or the Subsidiary
to such Person, other than (1) temporary leases for a term, including renewals
at the option of the lessee, of not more than five years, (2) leases between the
Company and a Subsidiary or between Subsidiaries, (3) leases of Restricted
Property executed by the time of, or within 12 months after the latest of, the
acquisition, the completion of construction or improvement, and the commencement
of commercial operation of the Restricted Property, and (4) arrangements
pursuant to any provision of law with an effect similar to the former Section
168(f)(8) of the Internal Revenue Code of 1954.
 
                                       23
<PAGE>   29
 
EVENTS OF DEFAULT
 
     The following are Events of Default under the Indenture with respect to the
Notes: (i) failure to pay principal of (or premium, if any, on) any Note when
due; (ii) failure to pay any interest on any Note when due, continued for 30
days; (iii) failure to perform any other covenant of the Company in the
Indenture, continued for 90 days after written notice as provided in the
Indenture; (iv) certain events of bankruptcy, insolvency or reorganization; and
(v) certain other Events of Default as specified in the Indenture. If an Event
of Default occurs and is continuing, either the Trustee or the Holders of at
least 25% in principal amount of the outstanding Notes may declare the principal
amount of all the Notes to be due and payable immediately. At any time after a
declaration of acceleration has been made, but before a judgment has been
obtained, the Holders of a majority in principal amount of the outstanding Notes
may, under certain circumstances, rescind and annul such declaration of
acceleration. Depending on the terms of other indebtedness of the Company
outstanding from time to time, an Event of Default under the Indenture may give
rise to cross defaults on such other indebtedness of the Company.
 
     The Indenture provides that, within 90 days after the occurrence of a
default in respect of the Notes, the Trustee will give to the Holders of the
Notes notice of all uncured and unwaived defaults known to it; provided,
however, that, except in the case of a default in the payment of the principal
of (or premium, if any) or any interest on, any Notes, the Trustee will be
protected in withholding such notice if it in good faith determines that the
withholding of such notice is in the interest of the Holders of the Notes; and
provided further, that such notice shall not be given until at least 30 days
after the occurrence of a default in the performance or breach of any covenant
or warranty of the Company under such Indenture other than for the payment of
the principal of (or premium, if any) or any interest on, any Notes. For the
purpose of this provision, "default" with respect to the Notes means any event
that is, or after notice or lapse of time, or both, would become, an Event of
Default with respect to the Notes.
 
     The Holders of a majority in principal amount of the outstanding Notes have
the right, subject to certain limitations, 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
Notes. The Indenture provides that in case an Event of Default shall occur and
be continuing, the Trustee shall exercise such of its rights and powers under
the applicable Indenture and use the same degree of care and skill in its
exercise as a prudent man would exercise or use under the circumstances in the
conduct of his own affairs. Subject to such provisions, the Trustee will be
under no obligation to exercise any of its rights or powers under the Indenture
at the request of any of the Holders of the Notes unless they shall have offered
to the Trustee reasonable security or indemnity against the costs, expenses and
liabilities that might be incurred by it in compliance with such request.
 
     The Holders of a majority in principal amount of the outstanding Notes may
on behalf of the Holders of all Notes waive any past default under the
Indenture, except a default in the payment of the principal of (or premium, if
any) or interest on any Note or in respect of a provision that under the
Indenture cannot be modified or amended without the consent of the Holder of
each Note affected. The Holders of a majority in principal amount of the
outstanding Notes affected thereby may on behalf of the Holders of all such
Notes waive compliance by the Company with certain restrictive provisions of the
Indenture.
 
     The Company is required to furnish to the Trustee annually a statement as
to the performance by the Company of certain of its obligations under the
Indenture and as to any default in such performance.
 
BOOK-ENTRY SYSTEM
 
     The Notes initially will be represented by one or more Global Notes
deposited with The Depository Trust Company ("DTC") and registered in the name
of a nominee of DTC. Except as set
                                       24
<PAGE>   30
 
forth below, the Notes will be available for purchase in denominations of $1,000
and integral multiples thereof in book-entry form only. The term "Depository"
refers to DTC or any successor depository.
 
     DTC has advised the Company and the Underwriters as follows: DTC is a
limited-purpose trust company organized under the laws of the State of New York,
a member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
was created to hold securities of persons who have accounts with DTC
("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. DTC's participants include
securities brokers and dealers (including the Underwriters), banks, trust
companies, clearing corporations and certain other organizations, some of which
(and/or their representatives) own DTC. Access to DTC'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.
 
     Upon the issuance by the Company of Notes represented by the Global Notes,
the Depository or its nominee 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
Notes represented by the Global Notes will be limited to participants or persons
that hold interests through participants. Ownership of such beneficial interests
in Notes will be shown on, and the transfer of that ownership will be effected
only through, records maintained by the Depository (with respect to interests of
participants in the Depository), or by participants in the Depository or persons
that may hold interests through such participants (with respect to persons other
than participants in the Depository). The laws of some states require that
certain purchasers of securities take physical delivery of such securities in
definitive form. Such limits and such laws may impair the ability to transfer
beneficial interest in Notes represented by Global Notes.
 
     So long as the Depository for a Global Note, or its nominee, is the
registered owner of such Global Note, the Depository or its nominee, as the case
may be, will be considered the sole owner or holder of the Notes represented by
such Global Note registered in its name. Participants and persons that hold
interests through participants will not receive or be entitled to receive
physical delivery of Notes in definitive form and will not be considered the
owners or holders thereof under the Indenture. Unless and until the Global Notes
are exchanged in whole or in part for individual certificates evidencing the
Notes represented thereby, such Global Notes may not be transferred except as a
whole by the Depository to a nominee of such Depository or by the Depository or
any nominee of such Depository to a successor Depository or any nominee of such
successor Depository.
 
     Payments of principal, premium, if any, of and interest on the Notes
represented by Global Notes registered in the name of the Depository or its
nominee will be made by the Company through the Paying Agent in immediately
available funds to the Depository or its nominee, as the case may be, as the
registered owner of the Notes represented by such Global Notes.
 
     The Company has been advised that the Depository or its nominee, upon
receipt of any payment of principal, premium, if any, or interest in respect of
the Notes represented by Global Notes, will credit immediately the accounts of
the related participants with payment in amounts proportionate to their
respective beneficial interest in the Notes represented by the Global Notes as
shown on the records of the Depository. The Company expects that payments by
participants to owners of beneficial interests in the Notes represented by the
Global Notes will be governed by standing customer instructions and customary
practices. Such payments will be the responsibility of such participants.
 
                                       25
<PAGE>   31
 
     If the Depository is at any time unwilling or unable to continue as
Depository and a successor Depository is not appointed by the Company within 90
days, the Company will issue individual Notes in definitive form in exchange for
the Global Notes. In addition, the Company may at any time in its sole
discretion determine not to have Global Notes and, in such event, will issue
individual Notes in definitive form in exchange for the Global Notes. In either
instance, the Company will issue Notes in definitive form, equal in aggregate
principal amount to the Global Notes, in such names and in such principal
amounts as the Depository shall request. Notes so issued in definitive form will
be issued in denominations of $1,000 and integral multiples thereof and will be
issued in registered form only, without coupons.
 
     Neither the Company, the Trustee, any Paying Agent nor the registrar for
the Notes 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 Notes represented by such Global Notes or for maintaining,
supervising or reviewing any records relating to such beneficial ownership
interests.
 
MODIFICATION
 
     Modification and amendments of the Indenture may be made by the Company and
the Trustee with the consent of the Holders of a majority in principal amount of
the outstanding Notes under the Indenture affected thereby; provided, however,
that no such modification or amendment may, without the consent of the Holder of
each outstanding Note affected thereby, (i) change the stated maturity date of
the principal of, or any installment of principal or of interest on, any Note,
(ii) reduce the principal amount of, or the premium (if any) or interest on, any
Note, (iii) change the place or currency or currencies (including composite
currencies) of payment of principal of, or premium (if any) or interest on, any
Note, (iv) impair the right to institute suit for the enforcement of any payment
on or with respect to any Note or (v) reduce the percentage in principal amount
of outstanding Notes, the consent of the Holders of which is required for
modification or amendment of the Indenture or for waiver of compliance with
certain provisions of the Indenture or for waiver of certain defaults.
 
     The Indenture provides that the Company and the Trustee may, without the
consent of any Holders of Notes, modify or amend the Indenture for the purpose
of curing ambiguities, defects or inconsistencies in the Indenture, provided
that such action to cure ambiguities, defects or inconsistencies shall not
adversely affect the interests of the Holders of the Notes in any material
respect.
 
DISCHARGE AND DEFEASANCE
 
     The Company may terminate its obligations under the Indenture, other than
its obligation to pay the principal of (and premium, if any) and interest on the
Notes and certain other obligations, provided that it (i) irrevocably deposits,
or causes to be irrevocably deposited with the Trustee as trust funds, money or
U.S. Government Obligations, maturing as to principal and interest sufficient to
pay the principal of and any interest on all outstanding Notes on the stated
maturity of such payments or on any Redemption Date and (ii) complies with
certain additional conditions specified to be applicable with respect to the
covenant defeasance of the Notes.
 
     The Notes also provide for legal defeasance pursuant to the Indenture. In
such case, if the Company (i) irrevocably deposits or causes to be irrevocably
deposited money or U.S. Government Obligations as described above, (ii) makes a
request to the Trustee to be discharged from its obligations on the Notes and
(iii) complies with additional conditions specified to be applicable with
respect to legal defeasance of the Notes, then the Company shall be deemed to
have paid and discharged the entire indebtedness on all the outstanding Notes,
the obligations of the Company under the Indenture and the Notes to pay the
principal of (and premium, if any) and interest on the Notes shall cease,
terminate and be completely discharged, and the Holders thereof shall thereafter
be entitled only to payment out of the money or U.S. Government Obligations
deposited with the
 
                                       26
<PAGE>   32
 
Trustee as aforesaid, unless the Company's obligations are revived and
reinstated because the Trustee is unable to apply such trust fund by reason of
any legal proceeding, order or judgment.
 
     "U.S. Government Obligations" is defined in the Indenture as direct
noncallable obligations of, or noncallable obligations the payment of principal
of and interest on which is guaranteed by, the United States of America, or to
the payment of which obligations or guarantees the full faith and credit of the
United States of America is pledged, or beneficial interests in a trust the
corpus of which consists exclusively of money or such obligations or a
combination thereof.
 
FORM, EXCHANGE, REGISTRATION AND TRANSFER
 
     The Notes are issuable in definitive form as registered debt securities.
Each Note will be exchangeable for other Notes of a like aggregate principal
amount and tenor of different authorized denominations.
 
     The Notes may be presented for registration of transfer (with the form of
transfer endorsed thereon duly executed), at the office of the Notes Registrar
or at the office of any transfer agent designated by the Company for such
purpose, without service charge and upon payment of any taxes and other
governmental charges as described in the Indenture. Such transfer or exchange
will be effected upon the Notes Registrar or such transfer agent, as the case
may be, being satisfied with the documents of title and identity of the Person
making the request. The Company will appoint the Trustee as Notes Registrar. The
Company may at any time rescind the designation of any transfer agent or approve
a change in the location through which any such transfer agent acts, except that
the Company will be required to maintain a transfer agent in each Place of
Payment for the Notes. The Company may at any time designate additional transfer
agents with respect to the Notes.
 
     In the event of any redemption in part, the Company shall not be required
to (i) issue, register the transfer of or exchange Notes during a period
beginning at the opening of business 15 days prior to the selection of Notes for
redemption and ending on the close of business on the day of mailing of the
relevant notice of redemption or (ii) register the transfer of or exchange any
Note, or portion thereof, called for redemption, except the unredeemed portion
of any Note being redeemed in part.
 
PAYMENT AND PAYING AGENTS
 
     Payment of principal of and any premium and interest on the Notes will be
made in the designated currency or currency unit at the office of such Paying
Agent or Paying Agents as the Company may designate from time to time, except
that, at the option of the Company, payment of any interest may be made by check
mailed to the address of the Person entitled thereto as such address shall
appear in the Notes Register. Payment of any installment of interest on the
Notes will be made to the Person in whose name the applicable Note is registered
at the close of business on the Regular Record Date for such interest.
 
     The Corporate Trust Office of the Trustee in San Francisco, California will
be designated as a Paying Agent for the Company for payment with respect to the
Notes. The Company may at any time designate additional Paying Agents or rescind
the designation of any Paying Agent or approve a change in the office through
which any Paying Agent acts, except that the Company will be required to
maintain a Paying Agent in each Place of Payment for the Notes.
 
     All monies paid by the Company to a Paying Agent for the payment of
principal of and any premium or interest on any Note that remain unclaimed at
the end of three years after such principal, premium or interest shall have
become due and payable will (subject to applicable escheat laws) be repaid to
the Company, and the Holder of such Note will thereafter look only to the
Company for payment thereof.
 
                                       27
<PAGE>   33
 
MEETINGS
 
     The Indenture contains provisions for convening meetings of the Holders of
the Notes. A meeting may be called at any time by the Trustee, and also, upon
request, by the Company or the Holders of at least 10% in principal amount of
the outstanding Notes, in any such case upon notice given as described under
"Notices" below. Except for any consent that must be given by the Holder of each
Note affected thereby, as described under "Modification" above, any resolution
presented at a meeting or adjourned meeting at which a quorum is present may be
adopted by the affirmative vote of the Holders of a majority in principal amount
of the Notes; provided, however, that, except for any consent that must be given
by the Holder of each Note affected thereby, as described under "Modification"
above, any resolution with respect to any request, demand, authorization,
direction, notice, consent, waiver or other action that may be made, given or
taken by the Holders of a specified percentage, which is less than a majority in
principal amount of the outstanding Notes may be adopted at a meeting or
adjourned meeting duly reconvened at which a quorum is present by the
affirmative vote of the Holders of such specified percentage in principal amount
of the outstanding Notes. Subject to the proviso set forth above, any resolution
passed or decision taken at any meeting of Holders of the Notes duly held in
accordance with the Indenture will be binding on all Holders of the Notes. The
quorum at any meeting called to adopt a resolution, and at any reconvened
meeting, will be Persons holding or representing a majority in principal amount
of the outstanding Notes.
 
GOVERNING LAW
 
     The Indenture and the Notes will be governed by and construed in accordance
with the laws of the State of New York.
 
NOTICES
 
     Notices to Holders of the Notes will be given by mail to the addresses of
such Holders as they appear in the Notes Register.
 
THE TRUSTEE
 
     The Trustee for the Notes is Chase Manhattan Bank and Trust Company,
National Association. The Indenture contains certain limitations on the right of
the Trustee, as a creditor of the Company, to obtain payment of claims in
certain cases and to realize on certain property received with respect to any
such claims, as security or otherwise. The Trustee is permitted to engage in
other transactions, except that, if it acquires any conflicting interest (as
defined), it must eliminate such conflict or resign.
 
     The Trustee may from time to time serve as a depositary of funds of, make
loans to and perform other services for the Company.
 
                                       28
<PAGE>   34
 
                 CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS
 
     The following is a summary of certain U.S. federal income tax consequences
associated with the acquisition, ownership and disposition of the Notes
applicable to initial purchasers of Notes. The summary is based upon the
Internal Revenue Code of 1986, as amended (the "Code"), Treasury regulations,
Internal Revenue Service ("IRS") rulings and judicial decisions, all as of the
date hereof and all of which are subject to change, possibly with retroactive
effect, or different interpretations. The discussion below does not address all
aspects of U.S. federal income taxation that may be relevant to particular
holders in the context of their specific investment circumstances (for example,
persons holding Notes as a hedge against currency risks or as part of a straddle
or conversion transaction) or to certain types of holders subject to special
treatment under such laws (for example, financial institutions, tax-exempt
organizations and insurance companies). In addition, the discussion does not
address any aspect of state, local or foreign taxation and assumes that the
initial purchasers of the Notes will hold them as "capital assets" within the
meaning of Section 1221 of the Code. The Company has not sought any ruling from
the IRS with respect to the statements made and the conclusions reached in the
following summary, and there can be no assurance that the IRS will agree with
such statements and conclusions.
 
     For purposes of this discussion, a "U.S. holder" is an individual who is a
citizen or resident of the United States, a corporation (or other entity taxable
as a corporation) created under the laws of the United States or any political
subdivision thereof, an estate or trust described in Section 7707(a)(30) of the
Code, or a person who is subject to U.S. federal income taxation on its
worldwide income regardless of its source.
 
     PROSPECTIVE PURCHASERS OF THE NOTES ARE URGED TO CONSULT THEIR TAX ADVISORS
CONCERNING THE UNITED STATES FEDERAL INCOME TAX CONSEQUENCES OF ACQUIRING,
OWNING AND DISPOSING OF THE NOTES AS WELL AS THE APPLICATION OF STATE, LOCAL AND
FOREIGN INCOME AND OTHER TAX LAWS.
 
U.S. HOLDERS
 
     Interest payable on the Notes will constitute interest for United States
federal income tax purposes and will be includable as ordinary income in the
income of a U.S. holder as received or accrued, in accordance with such holder's
regular method of accounting for United States federal income tax purposes. The
Company expects that the Notes will not be issued with original issue discount
("OID") within the meaning of the Code because it expects the price at which a
substantial amount of the Notes will be sold to equal the par amount of the
Notes or to be less than the par amount of the Notes by a de minimis amount
(within the meaning of the Code). In addition, for purposes of computing OID, no
portion of any premium paid by the Company to exercise its call option will be
included in the stated redemption price at maturity of the Notes because the
Company's call option will be deemed not to be exercised for purposes of the OID
rules. If a Note is sold or otherwise disposed of, a U.S. holder generally will
recognize gain or loss equal to the difference between the amount of cash
proceeds and the fair market value of any property received on the disposition
(except to the extent attributable to accrued but unpaid interest) and such
holder's tax basis in the Note. A U.S. holder's adjusted tax basis in a Note
generally will equal its cost plus the amount of interest income on the Note
previously taken into income by such holder but not yet received. The gain or
loss on the disposition will be capital gain or loss. Capital gain will be taxed
at a reduced rate for a U.S. holder who is not a corporation and who has held
the Note for more than one year and at a further reduced rate for a U.S. holder
who is not a corporation and who has held the Note for more than 18 months.
 
                                       29
<PAGE>   35
 
NON-U.S. HOLDERS
 
     Under present United States federal income tax law and subject to the
discussion of backup withholding below:
 
          (a) Payments of Interest on a Note by the Company or any agent of the
     Company to any holder of a Note who is not a U.S. holder (a "Non-U.S.
     holder") will not be subject to United States federal withholding tax (and
     the Non-U.S. holder will not be subject to United States federal income tax
     on such interest income), provided that such interest income is not
     effectively connected with a United States trade or business of the
     Non-U.S. holder and provided that (i) the Non-U.S. holder does not actually
     or constructively own 10% or more of the total combined voting power of all
     classes of stock of the Company entitled to vote; (ii) the Non-U.S. holder
     is not a controlled foreign corporation that is related to the Company
     through stock ownership; (iii) either (A) the beneficial owner of the Note
     certifies (by submitting to the Company or its agent a Form W-8 (or a
     suitable substitute form)) in compliance with applicable laws and
     regulations to the Company or its agent, under penalties of perjury, that
     it is not a "United States person" as defined in the Code and provides its
     name and address or (B) a securities clearing organization, bank or other
     financial institution that holds customers' securities in the ordinary
     course of its trade or business (a "financial institution"), that holds the
     Note on behalf of the beneficial owner, and provides a statement to the
     Company or its agent in which it certifies that a Form W-8 (or a suitable
     substitute form) has been received from the beneficial owner by it or by a
     financial institution between it and the beneficial owner and furnishes the
     payor with a copy thereof; and (iv) the Non-U.S. holder is not a bank which
     acquired the Note in consideration for an extension of credit made pursuant
     to a loan agreement entered into in the ordinary course of business. A
     Non-U.S. holder that is not exempt from tax under these rules will be
     subject to United States federal income tax withholding at a rate of 30%
     unless the interest is effectively connected with the conduct of a United
     States trade or business, in which case the interest will be subject to the
     United States federal income tax on net income that applies to United
     States persons generally. Non-U.S. holders should consult applicable income
     tax treaties, which may provide different rules.
 
          (b) A Non-U.S. holder will generally not be subject to United States
     federal income tax or withholding tax on gain realized on the sale,
     exchange or redemption of a Note unless (i) the gain is effectively
     connected with a United States trade or business of the Non-U.S. holder,
     (ii) in the case of a Non-U.S. holder who is an individual, such Non-U.S.
     holder is present in the United States for a period or periods aggregating
     183 days or more during the taxable year of the disposition or (iii) the
     Non-U.S. holder is subject to tax pursuant to the provisions of the Code
     applicable to certain United States expatriates. Non-U.S. holders should
     consult applicable income tax treaties, which may provide different rules.
 
     Treasury regulations that will be effective January 1, 1999, provide for
several alternative methods for Non-U.S. holders or "qualified intermediaries"
who hold Notes on behalf of Non-U.S. holders to obtain an exemption from
withholding on interest payments. The Treasury regulations also will require, in
the case of Notes held by a foreign partnership, that (i) the certification
described in clause (a)(iii) of the preceding paragraph be provided by the
partners rather than by the foreign partnership and (ii) the partnership provide
certain information to the payor, including a United States taxpayer
identification number. A look-through rule will apply in the case of tiered
partnerships.
 
     Except to the extent that an applicable treaty otherwise provides, a
Non-U.S. holder generally will be taxed in the same manner as a U.S. holder with
respect to interest or gain if the interest income or gain is effectively
connected with a United States trade or business of the Non-U.S. holder.
Effectively connected interest income received by a corporate Non-U.S. holder
may also, under certain circumstances, be subject to an additional "branch
profits tax" at a 30% rate (or, if applicable, at a lower treaty rate). Even
though such effectively connected interest income is subject
                                       30
<PAGE>   36
 
to income tax and may be subject to the branch profits tax, it is not subject to
withholding tax if the Non-U.S. holder delivers a properly executed IRS Form
4224 to the payor.
 
INFORMATION REPORTING AND BACKUP WITHHOLDING TAX
 
     In general, information reporting requirements may apply to principal and
interest payments on a Note and to payments of the proceeds of the sale of a
Note. A 31% backup withholding tax may apply to such payments unless the holder
(i) is a corporation, is a Non-U.S. holder or comes within certain other exempt
categories and, when required, demonstrates its exemption, or (ii) provides a
correct taxpayer identification number, certifies as to no loss of exemption
from backup withholding and otherwise complies with applicable requirements of
the backup withholding rules. A holder of a Note who does not provide the
Company with the holder's correct taxpayer identification number may be subject
to penalties imposed by the IRS. Any amounts withheld under the backup
withholding rules from a payment to a holder will be allowed as a credit against
such holder's United States federal income tax liability, provided that the
required information is furnished to the IRS.
 
                                       31
<PAGE>   37
 
                                  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 such Underwriters has severally agreed to purchase, the
principal amount of Notes set forth opposite its name below:
 
<TABLE>
<CAPTION>
                                                               PRINCIPAL
                                                               AMOUNT OF
                        UNDERWRITER                              NOTES
                        -----------                           ------------
<S>                                                           <C>
Goldman, Sachs & Co.........................................  $
Chase Securities Inc. ......................................
NationsBanc Montgomery Securities LLC.......................
                                                              ------------
          Total.............................................  $200,000,000
                                                              ============
</TABLE>
 
     Under the terms and conditions of the Underwriting Agreement, the
Underwriters are committed to take and pay for all of the Notes, if any are
taken.
 
     The Underwriters propose to offer the Notes in part directly to the public
at the initial public offering price set forth on the cover page of this
Prospectus and in part to certain securities dealers at such price less a
concession of      % of the principal amount of the Notes. The Underwriters may
allow, and such dealers may reallow, a concession not to exceed      % 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 entered into an underwriting agreement with certain
underwriters for the concurrent offer and sale of the Units in the Units
Offering. Neither the Units Offering nor this Notes offering is conditioned on
the consummation of the other offering. The Underwriters in the Units Offering
are Goldman Sachs & Co., Credit Suisse First Boston Corporation and Morgan
Stanley & Co. Incorporated.
 
     In connection with the offering, the Underwriters may purchase and sell the
Notes in the open market. These transactions may include over-allotment and
stabilizing transactions and purchases to cover short positions created by the
Underwriters in connection with the offering. Stabilizing transactions consist
of certain bids or purchases for the purpose of preventing or retarding a
decline in the market price of the Notes, and short positions created by the
Underwriters involve the sale by the Underwriters of a greater number of Notes
than they are required to purchase from the Company in the offering. The
Underwriters also may impose a penalty bid, whereby selling concessions allowed
to broker-dealers in respect of the Notes sold in the offering may be reclaimed
by the Underwriters if such Notes are repurchased by the Underwriters in
stabilizing or covering transactions. These activities may stabilize, maintain
or otherwise affect the market price of the Notes, which may be higher than the
price that might otherwise prevail in the open market; and these activities, if
commenced, may be discontinued at any time. These transactions may be effected
on the New York Stock Exchange, in the over-the-counter market or otherwise.
 
     The Notes are a new issue of securities with no established trading market.
The Company has been advised by the Underwriters that the Underwriters intend to
make a market in the Notes but are not obligated to do so and may discontinue
market making 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, certain of the
Underwriters and their affiliates have engaged in, and may in the future engage
in, investment banking and commercial banking activities with the Company and
its Subsidiaries.
 
     The Company has agreed to indemnify the several Underwriters against
certain liabilities, including liabilities under the Securities Act.
 
                                       32
<PAGE>   38
 
                             VALIDITY OF THE NOTES
 
     The validity of the Notes offered hereby will be passed upon for the
Company by Thompson & Knight, P.C., Dallas, Texas. Certain legal matters in
connection with the issuance of the Notes will be passed on for the Underwriters
by Fulbright & Jaworski L.L.P., Houston, Texas.
 
                                    EXPERTS
 
     The consolidated financial statements incorporated in this prospectus by
reference from the Company's Annual Report on Form 10-K/A for the year ended
December 31, 1997 have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report, which is incorporated herein by reference,
and have been so incorporated in reliance upon the report of such firm given
upon their authority as experts in accounting and auditing.
 
                                       33
<PAGE>   39
 
======================================================
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE SECURITIES TO
WHICH IT RELATES 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 NOR ANY SALE MADE HEREUNDER SHALL, UNDER
ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                       PAGE
                                       ----
<S>                                    <C>
Forward-looking Statements...........    ii
Available Information................   iii
Incorporation of Certain Documents by
  Reference..........................    iv
Prospectus Summary...................     1
Use of Proceeds......................     5
Capitalization.......................     6
Selected Consolidated Financial
  Data...............................     7
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations......................     9
Business.............................    13
Management...........................    18
Description of the Notes.............    20
Certain U.S. Federal Income Tax
  Considerations.....................    29
Underwriting.........................    32
Validity of the Notes................    33
Experts..............................    33
</TABLE>
 
======================================================
 
======================================================
                                  $200,000,000
 
                               WESTERN ATLAS INC.
                                  % SENIOR NOTES
                                    DUE 2008
                             ---------------------
 
                               WESTERN ATLAS LOGO
 
                             ---------------------
 
                              GOLDMAN, SACHS & CO.
                             CHASE SECURITIES INC.
                             NATIONSBANC MONTGOMERY
                                 SECURITIES LLC
======================================================
<PAGE>   40
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by the Company in connection
with the offering of the Senior Notes being registered hereby. All amounts shown
are estimates, except the Securities and Exchange Commission registration fee
and the New York Stock Exchange listing fee.
 
<TABLE>
<S>                                                           <C>
Securities and Exchange Commission Registration Fee.........  $59,000
NYSE Listing Fees...........................................     *
Legal Fees and Expenses.....................................     *
Accounting Fees.............................................     *
Printing and Engraving Costs................................     *
Rating Agencies' Fees.......................................     *
Trustee's Fees and Expenses.................................     *
Miscellaneous Expenses......................................     *
                                                              -------
  Total.....................................................  $
                                                              =======
</TABLE>
 
- ---------------
 
* To be filed by amendment
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     The Company is a Delaware corporation. Reference is made to Section 145 of
the Delaware General Corporation Law ("DGCL"), which provides that a corporation
may indemnify any person, including an officer or director, who was or is, or is
threatened to be made, a party to any threatened, pending or completed legal
action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of such corporation), by
reason of the fact that such person is or was an officer, director, employee or
agent of such corporation or is or was serving at the request of such
corporation as an officer, director, employee, or agent of another corporation,
partnership, joint venture, trust, or other enterprise. The indemnity may
include expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by such person in connection with
such action, suit or proceeding provided such officer, director, employee, or
agent acted in good faith and in a manner he or she reasonably believed to be in
or not opposed to the corporation's best interest and, with respect to criminal
proceedings, had no reasonable cause to believe that his or her conduct was
unlawful. Section 145 of the DGCL provides further that a Delaware corporation
may indemnify officers, directors, employees, or agents of the corporation in an
action by or in the right of the corporation under the same conditions, except
that no indemnification is permitted without judicial approval if the officer,
director, employee, or agent is adjudged to be liable to the corporation. Where
an officer, director, employee, or agent is successful on the merits or
otherwise in the defense of any action referred to above or any claim therein,
the corporation must indemnify him or her against the expenses that such person
actually and reasonably incurred.
 
     Article Sixth of the Company's Restated Certificate of Incorporation
provides that directors shall not be personally liable for monetary damages to
the Company or its stockholders for breach of fiduciary duty as directors,
except to the extent such exculpation is not permitted under the DGCL. Article
Sixth further stipulates that if the DGCL is amended to authorize corporate
action further eliminating or limiting the personal liability of directors, then
(without further actions by the stockholders of the Company) the liability of
the directors of the Company shall be eliminated or limited to the fullest
extent permitted by the DGCL, as so amended from time to time. Article Sixth of
the Company's Restated Certificate of Incorporation provides for the
indemnification of any person
 
                                      II-1
<PAGE>   41
 
who is a party to or is threatened to be made a party to or otherwise involved
in any proceeding, by reason of the fact that such person is or was a director
or officer of the Company to the fullest extent authorized by the DGCL, as the
same exists or may hereafter be amended (but in the case of such amendment, only
to the extent that such amendment permits the Company to provide broader
indemnification rights than the DGCL permitted the Company to provide prior to
such amendment), against all expense, liability and loss reasonably incurred or
suffered by such person in connection therewith and such indemnification shall
continue as to a person who has ceased to be a director or officer and shall
inure to the benefit of his or her heirs, executors or administrators.
 
     The Company also maintains director and officer liability insurance
policies covering directors and certain management employees.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                            DESCRIPTION OF EXHIBITS
        -------                            -----------------------
<C>                      <S>
           1.1           -- Form of Underwriting Agreement with respect to the
                            Notes.*
           4.1           -- Restated Certificate of Incorporation of the Company
                            dated March 17, 1994.**
           4.2           -- Bylaws of the Company dated March 17, 1994.**
           4.3           -- Rights Agreement dated as of August 17, 1994, between
                            Western Atlas Inc. and Chemical Trust Company of
                            California, as Rights Agent, which includes the form of
                            Certificate of Designations of Series A Junior
                            Participating Preferred Stock of Western Atlas Inc. as
                            Exhibit A, the form of Right Certificate as Exhibit B and
                            the Summary of Rights to Purchase Preferred Shares as
                            Exhibit C.***
           4.4           -- Form of Indenture.*
           5.1           -- Opinion of Thompson & Knight, P.C. regarding legality.*
          12.1           -- Computation of Ratio of Earnings to Fixed Charges.
          23.1           -- Consent of Thompson & Knight, P.C. (included in Exhibit
                            5.1).*
          23.2           -- Consent of Deloitte & Touche LLP.
          24.1           -- Power of Attorney (included on page II-4).
          25.1           -- Statement of Eligibility of Trustee on Form T-1.*
</TABLE>
 
- ---------------
 
*   To be filed by amendment.
 
**  Incorporated herein by reference to the same titled exhibit to the Company's
    Annual Report on Form 10-K for the fiscal year ended December 31, 1997 (File
    No. 1-12430), as amended by Form 10-K/A filed on March 11, 1998.
 
*** Incorporated by reference to the same titled exhibit to the Company's
    Current Report on Form 8-K, dated August 25, 1994 (File No. 1-12430).
 
ITEM 17. UNDERTAKINGS.
 
     (a) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the Company's
annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act
that is incorporated by reference in this registration statement shall be deemed
to be a new registration statement relating to the securities offered herein,
and the offering of such securities at that time shall be deemed to be the
initial bona fide offering thereof.
 
     (b) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the provisions
 
                                      II-2
<PAGE>   42
 
under Item 15 above, or otherwise, the Registrant has been advised that in the
opinion of the Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act of 1933 and will be governed by the final adjudication of such
issue.
 
     (c) The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act of 1933 shall be deemed to be part
     of this Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-3
<PAGE>   43
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas on the 11th day of March,
1998.
 
                                            WESTERN ATLAS INC.
 
                                            By:    /s/ JOHN R. RUSSELL
                                              ----------------------------------
                                                       John R. Russell
                                                President and Chief Executive
                                                            Officer
 
     Pursuant to the requirements of the Securities Act of 1933 (the "Act"),
this Registration Statement has been signed by the following persons in the
capacities and on the dates indicated. Each person whose signature appears below
constitutes and appoints James E. Brasher, and Lourdes T. Hernandez, and each of
them (with full power to each of them to act alone), his or her true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him or her and in his name, place and stead, in any and all capacities to
sign on his or her behalf individually and in each capacity stated below any
amendment, including post-effective amendments, to this Registration Statement
and any registration statement for the same offering filed pursuant to Rule 462
under the Act, and to file the same, with all exhibits thereto and other
documents in connection therewith with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as he or she might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents and either of them, or
their substitutes, may lawfully do or cause to be done by virtue hereof.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                        DATE
                      ---------                                        -----                        ----
<C>                                                      <S>                                <C>
 
                 /s/ JOHN R. RUSSELL                     President and Chief Executive         March 11, 1998
- -----------------------------------------------------      Officer and Director (Principal
                   John R. Russell                         Executive Officer)
 
                /s/ WILLIAM H. FLORES                    Senior Vice President and Chief       March 11, 1998
- -----------------------------------------------------      Financial Officer (Principal
                  William H. Flores                        Financial and Accounting
                                                           Officer)
 
                /s/ PAUL BANCROFT III                    Director                              March 11, 1998
- -----------------------------------------------------
                  Paul Bancroft III
 
                 /s/ ALTON J. BRANN                      Director and Chairman of the Board    March 11, 1998
- -----------------------------------------------------
                   Alton J. Brann
 
                 /s/ JOSEPH T. CASEY                     Director                              March 11, 1998
- -----------------------------------------------------
                   Joseph T. Casey
 
               /s/ WILLIAM C. EDWARDS                    Director                              March 11, 1998
- -----------------------------------------------------
                 William C. Edwards
</TABLE>
 
                                      II-4
<PAGE>   44
 
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                        DATE
                      ---------                                        -----                        ----
<C>                                                      <S>                                <C>
 
               /s/ CLAIRE W. GARGALLI                    Director                              March 11, 1998
- -----------------------------------------------------
                 Claire W. Gargalli
 
                  /s/ ORION L. HOCH                      Director                              March 11, 1998
- -----------------------------------------------------
                    Orion L. Hoch
</TABLE>
 
                                      II-5
<PAGE>   45
 
                                 EXHIBITS INDEX
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                            DESCRIPTION OF EXHIBITS
        -------                            -----------------------
<C>                      <S>
           1.1           -- Form of Underwriting Agreement with respect to the
                            Notes.*
           4.1           -- Restated Certificate of Incorporation of the Company
                            dated March 17, 1994.**
           4.2           -- Bylaws of the Company dated March 17, 1994.**
           4.3           -- Rights Agreement dated as of August 17, 1994, between
                            Western Atlas Inc. and Chemical Trust Company of
                            California, as Rights Agent, which includes the form of
                            Certificate of Designations of Series A Junior
                            Participating Preferred Stock of Western Atlas Inc. as
                            Exhibit A, the form of Right Certificate as Exhibit B and
                            the Summary of Rights to Purchase Preferred Shares as
                            Exhibit C.***
           4.4           -- Form of Indenture.*
           5.1           -- Opinion of Thompson & Knight, P.C. regarding legality. *
          12.1           -- Computation of Ratio of Earnings to Fixed Charges.
          23.1           -- Consent of Thompson & Knight, P.C. (included in Exhibit
                            5.1). *
          23.2           -- Consent of Deloitte & Touche LLP.
          24.1           -- Power of Attorney of Western Atlas Inc. (included on Page
                            II-4)
          25.1           -- Statement of Eligibility of Trustee on Form T-1.*
</TABLE>
 
- ---------------
 
*   To be filed by amendment.
 
**  Incorporated herein by reference to the same titled exhibit to the Company's
    Annual Report on Form 10-K for the fiscal year ended December 31, 1997 (File
    No. 1-12430), as amended by Form 10-K/A filed on March 11, 1998.
 
*** Incorporated by reference to the same titled exhibit to the Company's
    Current Report on Form 8-K, dated August 25, 1994 (File No. 1-12430).

<PAGE>   1
 
                                                                    EXHIBIT 12.1
 
                      WESTERN ATLAS INC. AND SUBSIDIARIES
 
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
 
<TABLE>
<CAPTION>
                                                                             FIVE MONTHS      YEAR
                                              YEAR ENDED DECEMBER 31,           ENDED        ENDED
                                          --------------------------------   DECEMBER 31,   JULY 31,
                                           1997     1996     1995    1994      1993(2)      1993(2)
                                          ------   ------   ------   -----   ------------   --------
                                                                (IN MILLIONS)
<S>                                       <C>      <C>      <C>      <C>     <C>            <C>
Income (loss) from continuing operations
  before income taxes...................  $151.2   $116.5   $103.2   $68.2     $(252.8)      $109.9
                                          ======   ======   ======   =====     =======       ======
Fixed charges:
  Interest expense......................  $ 42.9   $ 32.4   $ 33.5   $42.5     $  10.4       $ 19.7
  Capitalized interest..................     4.1       --       --      --          --           --
  Amortization of deferred loan costs...     0.7      0.7      0.7     4.7         0.1           --
                                          ------   ------   ------   -----     -------       ------
                                          $ 47.7   $ 33.1   $ 34.2   $47.2     $  10.5       $ 19.7
                                          ======   ======   ======   =====     =======       ======
Ratio of Earnings to Fixed Charges(1)...     4.1x     4.5x     4.0x    2.4x         --          6.6x
</TABLE>
 
- ---------------
 
(1) For the purpose of this calculation, "earnings" consist of net income from
    continuing operations before income taxes plus fixed charges excluding
    capitalized interest. "Fixed charges" consist of interest expense,
    capitalized interest, amortization of deferred loan costs, and the portions
    of operating leases that management believes are representative of the
    interest factor thereon. Earnings for the five months ended December 31,
    1993 were inadequate to cover fixed charges by $252.8 million.
 
(2) The Company became a publicly-traded company in March 1994, concurrent with
    the distribution of its Common Stock to the shareholders of Litton
    Industries, Inc. ("Litton"). The Company's fiscal year-end was changed from
    July 31 to December 31 in 1993. Interest expense, income taxes, and certain
    general and administrative corporate costs incurred by Litton were allocated
    to the Company for periods presented prior to January 1, 1994.

<PAGE>   1
 
                                                                    EXHIBIT 23.2
 
                         INDEPENDENT AUDITORS' CONSENT
 
     We consent to the incorporation by reference in this Registration
Statement, relating to $200,000,000 of Senior Notes due 2008, of Western Atlas
Inc. on Form S-3 of our report dated February 18, 1998 (March 9, 1998 with
respect to Note N) appearing in the Annual Report on Form 10-K/A of Western
Atlas Inc. for the year ended December 31, 1997 and to the reference to us under
the heading "Experts" in the Prospectus, which is part of this Registration
Statement.
 
/s/ DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP
 
Houston, Texas
March 11, 1998


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