TGS Q3 2012 Update

ASKER, NORWAY (8 October 2012) - Based on preliminary reporting from operating
units, TGS management now expects net revenues for the third quarter of 2012 to
be approximately USD 244 million, bringing estimated net revenues for the first
nine months of 2012 to approximately USD 650 million, 52% higher than the first
nine months of 2011. Multi-client investments for the third quarter are expected
to be approximately USD 139 million. As a result of the Company´s Q3 performance
and a preliminary forecast for Q4, management now believes full-year 2012
revenues will be between USD 870-910 million. Management will give a full report
of Q3 results on 1 November 2012.

Company summary

TGS-NOPEC Geophysical Company (TGS) provides multi-client geoscience data to oil
and gas Exploration and Production companies worldwide.  In addition to
extensive global geophysical and geological data libraries that include multi-
client seismic data, magnetic and gravity data, digital well logs, production
data and directional surveys, TGS also offers advanced processing and imaging
services, interpretation products, permanent reservoir monitoring and data
integration solutions.

For more information visit TGS online at www.tgs.com.

Forward-looking statements and contact information

All statements in this press release other than statements of historical fact
are forward-looking statements, which are subject to a number of risks,
uncertainties and assumptions that are difficult to predict, and are based upon
assumptions as to future events that may not prove accurate. These factors
include TGS´ reliance on a cyclical industry and principal customers, TGS´
ability to continue to expand markets for licensing of data, and TGS´ ability to
acquire and process data products at costs commensurate with profitability.
Actual results may differ materially from those expected or projected in the
forward-looking statements. TGS undertakes no responsibility or obligation to
update or alter forward-looking statements for any reason.

TGS-NOPEC Geophysical Company ASA is listed on the Oslo Stock Exchange
(OSLO:TGS).

For additional information about this press release please contact:

Kristian Johansen
Chief Financial Officer
Office: [phone]
Cell: [phone]
Email: [e-mail]

Karen El-Tawil
VP, Business Development
Office: [phone]
Email: [e-mail]

This information is subject of the disclosure requirements acc. to §5-12 vphl
(Norwegian Securities Trading Act)

This announcement is distributed by Thomson Reuters on behalf of
Thomson Reuters clients. The owner of this announcement warrants that:
(i) the releases contained herein are protected by copyright and
other applicable laws; and
(ii) they are solely responsible for the content, accuracy and
originality of the information contained therein.

Source: TGS via Thomson Reuters ONE
[HUG#1647116]

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