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Clay Mineralogy, Spore Coloration and Diagenesis in Middle Miocene Sediments of the Niger Delta

By
Francisca E. Oboh
Francisca E. Oboh
Department of Geology and Geophysics, University of Missouri, Rolla, Missouri 65401
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Published:
January 01, 1992

Abstract:

The clay-mineral assemblage of Middle Miocene sediments from the E2.0 Reservoir (3,590–3,655 m) in the Kolo Creek field is correlated with the color of palynomorphs in order to understand the level of diagenesis experienced by the sediments. The clay minerals in the mudstones are predominantly detrital kaolinite with significant amounts of illite/smectite, whereas in the sandstones, clays occur in minor amounts as mainly authigenic kaolinite. Quantitative measurements of the color of palynomorphs show that the sediments are immature to marginally mature and this level of maturity can be related to early diagenetic conditions before the emplacement of oil in the reservoir. A plot of palynomorph carbonization (luminance) versus percent illite in illite/smectite shows a fairly good correlation (statistically significant at a 95% level of confidence) between the two diagenetic parameters. The low level of maturity is not obvious from Kubler's illite crystallinity index for the mudrocks, which show a considerable variation over a short depth range.

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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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