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Reservoir diagenesis and hydrocarbon migration under hydrostatic palaeopressure conditions

Published online by Cambridge University Press:  09 July 2018

R. E. Swarbrick
R. E. Swarbrick*
Affiliation:
Department of Geological Sciences, University of Durham, South Road, Durham, DH1 3LE, UK
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Abstract

Fluid inclusion studies from two contrasting fields in the Northern North Sea reveal hydrostatic pressure conditions during the formation of secondary quartz overgrowths which trapped both brine and petroleum inclusions. In these fields, dating of authigenic illite, part of the diagenetic sequence and broadly coeval with quartz cementation, permits comparison with modelled pressure conditions. Pressure modelling indicates the likelihood of several periods of overpressure in the past, interspersed with normal pressure. The timing of diagenesis coincides with one of these periods of hydrostatic pressure. Furthermore, as both fields are now highly overpressured, the cause and timing of overpressure generation post-date the diagenesis. A model is proposed to link the pressure history and diagenesis.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 4 , October 1994 , pp. 463 - 473
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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