A2D Technologies and Landmark Graphics Sign Data Reseller Agreement; Well Log Data Now Available Bundled with Software Applications.

HOUSTON -- A2D Technologies, a TGS-NOPEC company, and Landmark Graphics Corporation, a Halliburton company (NYSE:HAL), announced today that they have entered into a data reseller relationship enabling Landmark Graphics ("LGC") to market and sell A2D well log data together with LGC software applications.

Oil company exploration departments, ever vigilant to consolidate costs and streamline procurement, increasingly request digital data when they acquire interpretative applications. This trend has been paralleled by a shift towards subscription-based licensing models where users lease applications and data together in a single offering. By signing this agreement, A2D and LGC are able to better serve segments of the Oil and Gas industry.

"Ours is a dynamic industry" said Rod Starr, A2D's Executive Vice President of Sales and Marketing. "Adapting to the ways the exploration community would prefer to operate is the driver for this agreement. Providing high-quality readily available well log data remains the core of our business and we see developing improved delivery channels for the end-user as part of that task."

Douglas Meikle, LGC Vice President of Global Sales and Delivery, agreed: "The establishment of a reseller's agreement between A2D and LGC reinforces each company's position and strength in the market. This current arrangement recognizes Landmark as a leading application provider while A2D is one of the industry's premier data vendors. This new relationship encourages continued cooperation between the organizations but also insures a superior balance of relative resources."

TGS-NOPEC Geophysical Company (TGS) is a leading global provider of multi-client geoscientific data, associated products and services to the oil and gas industry. TGS specializes in the creation of non-exclusive seismic surveys worldwide. The company also provides advanced depth imaging solutions and software through its TGS Imaging division. A2D Technologies, a wholly owned subsidiary, is the energy industry's well log data marketplace offering the largest online database, immediate delivery, conversion services, data management services and worldwide well log data sourcing. The TGS family of companies places a strong emphasis on providing high-quality data and the highest level of service to the industry.

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.

LGC is the leading supplier of software and services for the upstream oil and gas industry. The company's software solutions span exploration, production, drilling, business decision analysis and data management. LGC offers a broad range of consulting services that enables customers to optimize their technical, business and decision processes. Visit the LGC Web site at www.lgc.com for more information.

Halliburton is one of the world's largest providers of products and services to the petroleum and energy industries. The company serves its customers with a broad range of products and services through its Energy Services and Engineering and Construction Groups. The company's World Wide Web site can be accessed at www.halliburton.com.

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

Web-site: www.tgsnopec.no