TGS Q1-2010 interim report

1st QUARTER HIGHLIGHTS

• Consolidated net revenues were USD 148.2 million, up 109% from USD 70.8 million in Q1 2009.
• Gross late sales from the multi-client library totaled USD 96.1 million, up 132% from USD 41.5 million in Q1 2009. Net late sales of USD 73.4 million were 145% up from Q1 2009
• Net pre-funding revenues of USD 69.6 million increased 102% compared to Q1 2009 and funded 72% of the Company's operational investments into new multi-client products (USD 96.2 million).
• Operating profit (EBIT) was USD 58.8 million (40% of Net Revenues), up 197% from USD 19.8 million in Q1 2009.
• Cash flow from operations after taxes but before investments was USD 106.3 million, versus USD 95.9 million in Q1 2009.
• Earnings per share (fully diluted) were USD 0.40 versus USD 0.13 in Q1 2009.

"Our strong results in Q1 have further confirmed our view that our customers have returned to investing in high-quality data after a very challenging year for our industry in 2009,"  stated TGS' CEO Robert Hobbs. "Strong interest in our modern 3D and WAZ data in established plays such as the Gulf of Mexico has been augmented with increased interest in our new 2D and 3D data off West Africa as E&P companies continue to be drawn to this exciting new play."

TGS Q1-2010 Interim Report

CEO Robert Hobbs, VP Business Development Karen El-Tawil and Corporate Controller Fredrik Amundsen will also host a conference call on 6 May 2010 at 15:00 CET Norway time (9:00 AM New York time). Norwegian attendees are invited to call +47 2415 9758 and international attendees are invited to call +44 (0) 20 7806 1968. Attendees may want to call 5-10 minutes before 15:00 CET (9:00 AM NY) to ensure registration and access.

Participants will have to quote the following confirmation code when dialing into the conference: 4863443.

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 TGS conference call,

• dial +47 2100 0498 (Norway) or +44 (0) 20 7111 1244 (International)
• replay access code 4863443 followed by # (pound-sign)

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