WESTERNGECO CONDUCTS NEW HIGH-RESOLUTION Q-TECHNOLOGY SURVEY

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WESTERNGECO CONDUCTS NEW HIGH-RESOLUTION Q-TECHNOLOGY SURVEY
25 July 2005 - Schlumberger

WesternGeco announced today that Sabah Shell Petroleum Company Limited has contracted the company to conduct a high-resolution Q-Marine survey over its St. Joseph field, offshore Sabah, Malaysia.

The survey, which commenced in June, is the first Q-Marine project in Southeast Asia and will cover approximately 100 square kilometers.

The shallow, structurally complex St. Joseph reservoir produces oil and gas in an area that poses many surveying and imaging challenges. Strong currents, numerous obstructions and infrastructure, combined with difficult near-surface conditions, have hindered previous conventional survey attempts to image faults and reservoir sands.

The Q-Technology vessel, Geco Topaz, is conducting the survey towing six 3000-meter cables with a separation of 30 meters, using the WesternGeco proprietary calibrated Q-Marine source.

"The combination of imaging requirements and logistical challenges requires a trace density of 6.25 meters and cable separation of 30 meters, resulting in one of the highest density surveys in the region," said Carel Hooykaas, WesternGeco marine manager. "Q-Technology acquisition and processing will provide the detailed images needed for reservoir management decisions in this mature field."

Q is the WesternGeco proprietary suite of advanced seismic technologies for enhanced reservoir location, description, and management. For additional information on Q-Marine, the world's only fully calibrated, point-receiver marine seismic acquisition and processing system, as well as Q-Land and Q-Seabed, see www.westerngeco.com/q-technology

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About: Schlumberger
Schlumberger is the world's leading oilfield services company supplying technology, project management and information solutions that optimize performance for customers working in the oil and gas industry. The company employs more than 52,000 people of over 140 nationalities working in more than 80 countries, and comprises two business segments.

Schlumberger supplies a wide range of products and services from formation evaluation through directional drilling, well cementing and stimulation, well completions and productivity to consulting, software, information management and IT infrastructure services that support core industry operational processes. WesternGeco, jointly owned with Baker Hughes, is the world's largest seismic company and provides advanced acquisition and data processing services.

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