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Book Chapter

Isotopic Dating of Diagenetic Illites in Reservoir Sandstones: Influence of the Investigator Effect

By
Norbert Clauer
Norbert Clauer
Centre de Géochimie de la Surface, I rue Blessig, 67084-Slrasbourg, France JOSHUA D. COCKER Mobil Exploration and Production, P.O. Box 5444, Denver, Colorado 80217, USA
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Joshua D. Cocker
Joshua D. Cocker
Mobil Exploration and Production P O Box 5444 Denver Colorado 80217 USA
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Sam Chaudhuri
Sam Chaudhuri
Department of Geology, Kansas State University, Manhattan, Kansas 66506, USA
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Published:
January 01, 1992

Abstract:

Authigenic illite generated during diagenetic events occurring in clastic reservoirs is datable by isotopic methods. Questionable analytical procedures adopted by the investigators can lead to doubtful meanings of the data. To avoid these ambiguities, precautionary steps should be systematically followed in selection, preparation, and characterization of the illite-enriched clay material. These steps include specific techniques, such as gentle disaggregation of the rocks instead of routine crushing, and extensive use of electron microscopy (TEM and SEM).

Potential exists for 40Ar/39Ar-age determinations of these illites, which would avoid the time-consuming separation of the clay materials by size fractionation, but would not avoid its careful characterization. Basic tests for the systematics have still to be determined before routine application of this technique can be expected and investigator factor controlled.

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Contents

SEPM Special Publication

Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones

David W. Houseknecht
David W. Houseknecht
Department of Geological Sciences University of Missouri Columbia Missouri 65211
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Edward D. Pittman
Edward D. Pittman
Department of Geosciences University of Tulsa Tulsa Oklahoma 74104
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SEPM Society for Sedimentary Geology
Volume
47
ISBN electronic:
9781565761728
Publication date:
January 01, 1992

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