Isotopic Dating of Diagenetic Illites in Reservoir Sandstones: Influence of the Investigator Effect
Norbert Clauer, Joshua D. Cocker, Sam Chaudhuri, 1992. "Isotopic Dating of Diagenetic Illites in Reservoir Sandstones: Influence of the Investigator Effect", Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones, David W. Houseknecht, Edward D. Pittman
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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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Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstone–This volume grew out of a symposium held at the 27th Annual Meeting of the Clay Minerals Society in Columbia, Missouri on October, 1990. The symposium was designed to present a current synthesis of research devoted to the origin, diagenesis and petrophysics of clay minerals in sandstones. International authors demonstrate a multidisciplinary approach to interpreting the origin and diagenesis of clay minerals in sandstones and to evaluating their influence on reservoir quality. This volume bridges a gap between petrographic and geochemical researchers and reservoir geologists and engineers.