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Abstract: Reservoir Geochemistry as a Reservoir Appraisal and Management Tool - An Evaluation

Steve R. Larter, Gordon Macleod, G. Stuart Petch, Andrew C. Aplin, Craig Smalley, Andy Fleet, William England, Nigel Goodwin, Norman Oxtoby, Peter Hall, Henning Jensen, Bernard Carpentier, Arnd Wilhelms, Eric Lafargue, Alain Huc, Gavin McAulay, Colin Hughes, Charles Curtis

In 1992 the European Community THERMIE technology demonstration program funded a group project aimed at demonstrating the application of then current reservoir geochemical technology to the improved management and appraisal of a North Sea oil and a North Sea gas condensate field. The two BP operated fields, Miller and Bruce were studied with a concerted battery of organic and inorganic geochemical methods integrated with petrographic and field geology data. We describe the successes and failures of the project and review the role of reservoir geochemistry in production management.

Small tar mats (minimats) were identified in Miller field within the oil column using both customised conventional geochemical methods and modified e-log procedures. Whereas in the Bruce gas condensate field petroleum fingerprinting provided a great deal of supplementary information to well test data on field compartmentalisation, in the Miller oil field, in contrast, while strontium isotope data on residual salts in reservoir cores provided clear evidence of internal reservoir barriers the petroleum compositional data did not! Strontium isotopes coupled with petroleum geochemical data did clearly reveal the charging history of the Bruce field. Petroleum geochemical information coupled with fluid inclusion and diagenetic studies provided clear indications of the large and local scale ield charging scenarios for both Fields which aided in understanding the large scale connectivities of the reservoirs.

The studies illustrated the power of linked inorganic and organic geochemical methods as cost effective standard reservoir evaluation procedures but indicated that given methods will not be useful in every scenario. Recommendations for the protocol of such studies are made in the paper.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France