A2D Releases Calibrated-Image Format Specs to the Public Domain

20 April 2004

Houston, Texas (20 April, 2004) A2D Technologies has released the technical specifications for a new, calibrated image format (RasterML) into the public domain. The new, modernized format, utilizes XML-based technology to describe depth-calibrated well-log images. XML is an open standard for identifying and describing data and facilitates the exchange of data between individual applications or data stores. RasterML is a simple format for exchanging well log images over networks.

A2D's depth-calibrated well-log images, under the trademark smartRASTER®, are basic TIFF files, or well-log scans, that have had additional intelligence added to them about the log type, log-curve scales, measured depth positions and unique well identifier (UWID). The images can be imported into a number of industry-standard well-log correlation tools for the purposes of tops picking and cross section construction. A2D smartRASTER's are a cost efficient alternative for companies managing hardcopy log libraries and enable exploration workflow improvements.

Depth-calibrated well-log images have recently been incorporated into the PPDM Association's industry standard data model, PPDM version 3.7. A2D Technologies was an active participant in the PPDM Association Well Log work group during the design and testing phases of this module. For more information, visit the PPDM Association's web site at www.ppdm.org.

A2D is currently distributing their smartRASTER well logs using the proprietary smartRASTER Interchange format (SIF). The release of the new Calibrated Image Format (RasterML) will provide a new, non-proprietary format to facilitate the transfer of this data type.

"Clients and software vendors want to see the standardization of how depth-calibrated well-log images are transported, stored and managed", stated Dave Kotowych, A2D President, "Our Company has built an inventory of over 3 million well logs in North America, the largest online collection in the world. Our smartRASTER well logs have grown rapidly in popularity and are now utilized by most Major and Independent oil and gas companies in the U.S. Anticipating industry trends has been the key to development of our well log data solutions. Releasing this format into the public domain is part of that strategy."

A2D has established a close working relationship with the Petrotechnical Open Standards Consortium (POSC) regarding RasterML. The long-term objective is that POSC will be the custodian (for publication, extension and maintenance) of the RasterML XML format. POSC is an energy industry consortium focused on XML-based data-transfer standards (www.posc.org).

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. TGS-NOPEC is listed on the Oslo Stock Exchange (OSLO:TGS). Web-site: www.tgsnopec.com