TGS Q3 2017 webcast and teleconference ASKER, N

ASKER, NORWAY (19 October 2017) - TGS will release its Q3 2017 results at approximately 07:00 CEST on 26 October 2017.  CEO Kristian Johansen and CFO Sven Børre Larsen will present the results at 09:00 CEST at the Hotel Continental (Teatersalen) in Oslo, Norway.  The presentation is open to the public and can be followed live on the internet at www.tgs.com or directly from the webcast .

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

CEO Kristian Johansen and CFO Sven Børre Larsen will host a conference call on 26 October 2017 at 14:30 CEST (08:30 EDT).  Attendees may want to call 5-10 minutes before to ensure registration and access.

• Norwegian attendees are invited to call + 800 51084 or + 47 2350 0296
• International attendees are invited to call 0800 279 7204 or + 44 (0)330 336 9411
• US attendees are invited to call +1 866-548-4713 or +1 719-325-2202

Participants will need to quote the following confirmation code when dialing into the conference: 2899853.

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 23 50 00 77 or + 800 196 72 (Norway), + 44 (0) 207 660 0134 or + 0 808 101 1153 (International) or +1 719 457 0820 or + 888 203 1112 (US) replay access code 2899853 followed by # (pound-sign).   A replay of the conference call will also be available at www.tgs.com. 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, 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 principle 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 ).

TGS sponsored American Depositary Shares trade on the U.S. over-the-counter market under the symbol "TGSGY".

For additional information about this press release please contact: Sven Børre Larsen Chief Financial Officer Tel: +47 90 94 36 73 Email: sven.larsen@tgs.com

Will Ashby VP HR & Communication Tel: +1 713 860 2184  Email: will.ashby@tgs.com

This information is subject to the disclosure requirements pursuant to section 5-12 of the Norwegian Securities Trading Act.