LETTER OF TRANSMITTAL
TO TENDER SHARES OF COMMON STOCK
$6.71 NET PER SHARE
SERCEL ACQUISITION CORP.
A DIRECT, WHOLLY OWNED SUBSIDIARY
AN INDIRECT, WHOLLY OWNED SUBSIDIARY
COMPAGNIE GENERALE DE GEOPHYSIQUE
THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK
CITY TIME, ON FRIDAY, DECEMBER 10, 1999, UNLESS THE OFFER IS EXTENDED.
THE DEPOSITARY FOR THE OFFER IS:
Continental Stock Transfer & Trust Company
Two Broadway, 19th Floor Reorganization Department New York, New York 10004
BY FACSIMILE TRANSMISSION:
(For Eligible Institutions only)
FOR INFORMATION (CALL COLLECT):
(212) 509-4000 x 535
DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH
ABOVE OR TRANSMISSIONS OF INSTRUCTIONS VIA FACSIMILE TRANSMISSION TO A
NUMBER OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY
TO THE DEPOSITARY. YOU MUST SIGN THIS LETTER OF TRANSMITTAL IN THE APPROPRIATE
SPACE THEREFOR PROVIDED BELOW AND COMPLETE THE SUBSTITUTE FORM W-9 SET
THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.
This Letter of Transmittal is to be completed by stockholders of the Company ("Stockholders") either if
certificates for Shares (as defined in the Offer To Purchase, dated October 29, 1999 (the "Offer To Purchase"))
are to be forwarded herewith or, unless an Agent's Message (as defined in the Offer To Purchase) is utilized, if
tenders of Shares are to be made by book-entry transfer to an account maintained by Continental Stock Transfer
& Trust Company (the "Depositary") at The Depository Trust Company ("DTC") (the "Book-Entry Transfer
Facility") pursuant to the procedures set forth in Section 3 of the Offer To Purchase. Stockholders who tender
Shares by book-entry transfer are referred to herein as "Book-Entry Stockholders."
Stockholders whose certificates for such Sh