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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
Report of Foreign Private Issuer
Pursuant to Rule 13a- 16 or 15d- 16 of
the Securities Exchange Act of 1934
For the month of August, 2006
GENERAL COMPANY OF GEOPHYSICS
(translation of registrant’s name into English)
1, rue Leon Migaux, 91341 MASSY FRANCE
(address of principal executive offices)
Indicate by check mark whether the registrant files or will file annual reports under cover Form
20-F or Form 40-F.
Form 20-F þ Form 40-F o
Indicate by check mark whether by furnishing the information contained in this Form the registrant
is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the
Securities Exchange Act of 1934.
Yes o No þ
If “Yes” is marked, indicate below the file number assigned to the registrant in connection with
Rule 12g3-2(b): 82
COMPAGNIE GENERALE DE GEOPHYSIQUE
Compagnie Generale de Geophysique extends exchange offer relating to Outstanding 71/2% Senior Notes
August 7, 2006
Compagnie Générale de Géophysique (the “Issuer”)-ISIN : 0000120164 — GEPH.PA — NYSE : GGY — today
announced that the expiration date of its offer (the “Exchange Offer”) to exchange up to $165
million aggregate principal amount of its outstanding 71/2% Senior Notes due 2015, which were
initially issued and sold on February 3, 2006 outside the United States pursuant to Regulation S of
the Securities Act of 1933 and in the United States to qualified institutional buyers pursuant to
Rule 144A under the Securities Act of 1933, for an equal aggregate principal amount of its
registered 71/2% Senior Notes due 2015, has been extended to 5:00 p.m., New York City time, on
Friday, August 11, 2006.
To date, the Issuer has received tenders of Notes from holders of over 99% of the outstanding
principal amount of the 71/2% Senior Notes pursuant to its Exchange Offer and the related Letter of
Transmittal and Notice of Guaranteed Delivery.
JPMorgan Chase Bank is the exchange agent for the Exchange Offer, and also acts as trustee.
THIS FORM 6-K REPORT IS HEREBY INCORPORATED BY REFERENCE INTO THE PROSPECTUS CONTAINED IN
COMPAGNIE GENERALE DE GEOPHYSIQUE’S REGISTRATION STATEMENT ON FORMS F-4 AND S-4 (REGISTRATION
STATEMENT NO. 333-134649), AND SHALL BE A PART THEREOF FROM THE DATE ON WHICH THIS REPORT IS
FURNISHED, TO THE EXTENT NOT SUPERSEDED BY DOCUMENTS OR REPORTS SUBSEQUENTLY FILED OR FURNISHED.
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Contacts : |
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Michel PONTHUS
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+ (33) 1 64 47 37 38 |
Christophe BARNINI
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+ (33) 1 64 47 38 11 |
Email: invrel@cgg.com
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Internet: www.cgg.com |
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned, thereunto duly authorized.
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COMPAGNIE GENERALE DE GEOPHYSIQUE |
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1, rue Leon Migaux |
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91341 — Massy Cedex |
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GENERAL COMPANY OF GEOPHYSICS |
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Date: August 7, 2006
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By /s/ Thierry Le ROUX |
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Name: Thierry Le ROUX |
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Title: Group President and Chief Financial Officer |