Schlumberger announces licensing of Brent field survey

Jul 07, 2000 02:00 AM

Schlumberger Oilfield Services announced the licensing of the Brent non-exclusive 4C survey to Shell UK Exploration and Production, operator in the UK sector of the North Sea on behalf of Shell and Esso.
The Brent field is located 160 km north-east of the Shetland Islands. It was discovered in 1971 and has been in steady production since 1976. The Brent 4C survey, acquired by two Schlumberger specialist 4C seismic vessels, the "Geco Angler" and "Geco Bluefin," in October and November 1999, covers 62.4 sq km. The primary objective of the Brent 4C survey was to use the PZ data for improved imaging of the Brent slumps, which form a complex area on the eastern side of the field.

The new PZ migrated data have been compared with 96-fold towed streamer data acquired in 1995 on a line-by-line basis. The new PZ data provide consistently better reflection continuity, fault definition and structural imaging. Factors contributing to the improvement include better demultiples by combining the P and Z (hydrophone and geophone) recordings, wider azimuths that provide better subsurface illumination, and better positional control through the use of seabed cables.
Shell geophysicist Stuart Arnott commented, "In comparison with our towed streamer data, the new 4C data provide significantly improved structural imaging of the complex slumped areas of the (Brent) field. We expect this to lead to improved targeting of undeveloped reserves and reduced drilling costs." According to John Close, regional vice president for Schlumberger Reservoir Evaluation Seismic, the results of the new survey have been very illuminating, and the very impressive data quality and detail now being revealed in the Brent 4C survey complement similar successes in other Schlumberger 4C seismic surveys. This success at Brent will result in a surge of interest in 4C technology and our large 4C North Sea portfolio.

Schlumberger Oilfield Services, a business segment of Schlumberger, is the leading supplier of services and technology to the international petroleum industry and operates offices, service locations, and research and development facilities around the world. Schlumberger is a global leader in technical services spanning the oil and gas, utility, semiconductor, smart cards, network and Internet solutions industries. Schlumberger revenue was $ 8.4 bn in 1999.

Source: Business Wire via Newspage
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