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Authigenic Mineralogy of Sandstones Intercalated with Organic-Rich Mudstones: Integrating Diagenesis and Burial History of the Mesaverde Group, Piceance Basin, NW Colorado

By
Laura J. Crossey
Laura J. Crossey
Department of Geology, University of New Mexico. Albuquerque, New Mexico 87131
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Daniel Larsen
Daniel Larsen
Department of Geology, University of New Mexico. Albuquerque, New Mexico 87131
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Published:
January 01, 1992

Abstract:

Twenty-nine sets of sandstone and stratigraphically adjacent, fine-grained, organic-rich samples representing diverse depositiona! environments (fluvial, coastal, paludal, and marine) have been obtained from cores of the Mesaverde Group within the Piceance Basin, Colorado. These units have been buried to a sufficient depth that organic maturation has progressed to an advanced state (vitrinite-reflectance values range from 1.0 to 2.2 in the study area). The authigenic-mineral paragenesis and organic data are integrated with burial and thermal-history modeling to place diagenetic events and hydrocarbon generation into a temporal framework. Three phases of diagenesis (early, late, and post-hydrocarbon) are characterized on the basis of petrography, XRD, and geochemistry of authigenic phases.

Clay-mineral distributions of sandstone/mudstone pairs indicate that mixed-layer illite/smectite dominates mudstone mineralogy, although subordinate amounts of chlorite are observed in the marine interval. Sandstone mineralogy also includes mixed-layer clays and chlorite, with the addition of kaolinite. Additional aspects of sandstone diagenesis examined include feldspar albitization and dissolution, and carbonate mineralogy.

Organic analyses indicate the presence of a type III kerogen component in all samples. The paludal interval contains the most oxygen-rich organic material and exhibits the highest sandstone porosities. Water-soluble organic compounds released from organic material as burial progresses have been invoked as agents affecting the course of mineral diagenesis in clastic sediments and sedimentary rocks. Our results indicate the potential for the field evaluation of the effects of thermal maturation of organic matter on the diagenesis of closely adjacent sandstones.

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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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