--> Abstract: Detection of Petroleum Heterogeneity in Eldfisk and Satellite Fields using Pyrolysis and Isotope-GC Techniques, by P. B. Hall, M. Bjoroy, D. Stoddart, S. R. Larter, and J. E. Brasher; #90987 (1993).

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HALL, P.B., and * M. BJOROY, Geolab Nor, A/S, Trondheim, Norway; D. STODDART and S.R. LARTER, University of Newcastle, Newcastle-Upon-Tyne, UK; and J. E. BRASHER, Phillips Petroleum, Tananger, Norway

ABSTRACT: Detection of Petroleum Heterogeneity in Eldfisk and Satellite Fields using Pyrolysis and Isotope-GC Techniques

Petroleum geochemical research is being applied more and more to production-oriented problems such as improving recovery of oil from existing fields and identifying satellite fields. Recent studies by ourselves and others have suggested that compositional heterogeneities within the petroleum column of reservoirs can provide information relevant to these objectives.

The main techniques employed in this study which are particularly useful in distinguishing heterogeneities include thermal extraction- and pyrolysis-GC and thermal extraction-GC-MS and isotope GC. The latter is a relatively new technique in which the stable carbon isotope composition of single hydrocarbon compounds are determined. Recent studies have shown that it can be used to differentiate between oils from different parts of the Central Graben.

In this study data were acquired on core samples (approx. 750) from the Paleocene/Cretaceous Eldfisk Chalk reservoir (2/7 block Norwegian North Sea) and from 55 oils from the Greater Ekofisk area. The acquired data reveal distinct variations in Oil composition within Eldfisk and between the various surrounding fields. These observations, when integrated with geological data, can lead to an improved understanding of intra-reservoir compartmentalization and the possible field filling directions. The conclusions from this may also aid in exploration for satellite fields as well as influencing the production plan for the Eldfisk field.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.