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Modelling of chalk diagenesis (Eldfisk Field, Norwegian North Sea) using whole rock and laser ablation stable isotopic data

Published online by Cambridge University Press:  01 May 2009

R. G. Maliva ,
J. A. D. Dickson  and
A. Råheim
R. G. Maliva
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom
J. A. D. Dickson
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom
A. Råheim
Affiliation:
Institute for Energy Technology, P.O. Box 40, 2007 Kjeller, Norway
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Abstract

Laser ablation techniques permit the determination of the stable isotopic ratios of finely crystalline calcite cements in chalks for the first time. Modelling of fluid–rock interaction using whole rock and laser ablation stable isotopic data indicates that carbonate mineral diagenesis in the Eldfisk Field consisted largely of the dissolution and reprecipitation of calcite with little associated loss of porosity. Cementation by calcite derived from stylolites apparently occurred throughout the Eldfisk Field chalk, but had only a subsidiary effect on whole rock isotopic ratios. Oxygen isotopic data indicates a pore water temperature of 50–80 °C during the bulk of chalk recrystallization. Increases in whole rock δ13C values with depth are likely the result of bacterial methanogenesis during chalk recrystallization.

Type
Research Article
Information
Geological Magazine , Volume 128 , Issue 1 , January 1991 , pp. 43 - 49
Copyright
Copyright © Cambridge University Press 1991

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