ASKER, NORWAY (28 April 2011) - TGS will publish its Q1 2011 results at
approximately 08:00 CET on 5 May 2011. At the same time, a recorded presentation
with audio by CEO Robert Hobbs and CFO Kristian Johansen will be made available
atwww.tgsnopec.com.

The slides from the presentation will also be available in PDF format at both
the TGS and Oslo Stock Exchange websites.

CEO Robert Hobbs and CFO Kristian Johansen will also host a conference call on
5 May 2011 at 15:00 CET Norway time (9:00 AM New York time).  Attendees may want
to call 5-10 minutes before 15:00 CET (9:00 AM NY) to ensure registration and
access.

·         Norwegian attendees are invited to call +800 51066 or +47 2415 9757

·         International attendees are invited to call 0800 032 3808  or +44
(0)20 7138 0844

·         US attendees are invited to call +1 866 602 0258

Participants will need to quote the following confirmation code when dialing
into the conference: 6488721.

A Q&A session will follow a short introduction, based upon the presentation
issued in the morning. To pose a question, please press *1.

A replay of the conference call will be available shortly after. To access
replay of the TGS conference call,

  * dial +47 2100 0498 (Norway) or +44 (0)20 7111 1244 (International) or
    +1 347 366 9565  (US)
  * replay access code 6488721 followed by # (pound-sign)

A replay of the conference call will also be available at www.tgsnopec.com

Company summary

TGS-NOPEC Geophysical Company (TGS) provides global geoscience data products and
services to the oil and gas industry for the exploration and delineation of
hydrocarbon reserves.  We design and acquire multi-client data projects
worldwide that make up our data library of seismic, gravity/magnetic and well
data, enhanced by our seismic imaging technology and regional interpretation
expertise.  Visit TGS online at www.tgsnopec.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: +47 667 69931
Cell: +47 47 60 33 34
Email:kristian.johansen@tgsnopec.com

Karen El-Tawil
VP, Business Development
Office: +1 713 860 2102
Cell: +1 713 806 2420
Email:karen.el-tawil@tgsnopec.com



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


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