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Illite-smectite diagenesis and palaeotemperatures in Northern North Sea Quaternary to Mesozoic shale sequences

Published online by Cambridge University Press:  09 July 2018

M. J. Pearson  and
J. S. Small
M. J. Pearson
Affiliation:
Department of Geology, The University, Marischal College, Aberdeen AB9 1AS
J. S. Small
Affiliation:
Department of Geology, The University, Oxford Road, Manchester M13 9PL
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Abstract

Clay mineral abundances and illite-smectite (I/S) compositions have been determined by X-ray diffraction (XRD) in shales of Permo-Triassic to Quaternary age from seven wells in the Viking Graben and Moray Firth. Chemical analyses of size fractions provide evidence that diagenetic illitization of smectite has occurred during burial by uptake of Al and K, and release of Si. K-feldspar was probably the main source of K for illitization. The depth at which random I/S disappears occurs at similar temperatures (mean 93°C) in each well for which reliable measurements are available. Vitrinite reflectance measurements at this depth are also similar (mean 0·64% R0) and correspond to early oil generation. I/S diagenetic levels may have been imprinted by a Tertiary heating event.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 2 , June 1988 , pp. 109 - 132
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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