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Diagenesis of a deeply buried sandstone reservoir: Hild Field, Northern North Sea

Published online by Cambridge University Press:  09 July 2018

A. Lønøy ,
J. Akselsen  and
K. Rønning
A. Lønøy
Affiliation:
Norsk Hydro Research Centre, PO Box 4313, N-5001 Bergen, Norway
J. Akselsen
Affiliation:
Norsk Hydro Research Centre, PO Box 4313, N-5001 Bergen, Norway
K. Rønning
Affiliation:
Norsk Hydro Research Centre, PO Box 4313, N-5001 Bergen, Norway
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Abstract

Calcite cementation and extensive dissolution of feldspar with formation of authigenic kaolinite, quartz cement and secondary porosity are the main diagenetic processes in the deeply buried Hild Field. Mineralogical and isotopic analyses, reservoir pressure and depositional environment suggest that these diagenetic processes occurred prior to burial at a depth of 1·5–2 km. The timing of the diagenetic sequence suggests that feldspar dissolution is related to meteoric water flow. Calcite occurs as an early diagenetic iron-poor cement, and as two types of later diagenetic (<120°C) ferroan calcite cements. The ferroan calcites are mainly an in situ dissolution-reprecipitation product of the early diagenetic phase. Extensive local dissolution of calcite was important for forming secondary porosity which is closely associated with a prominent ‘gas chimney’ in the area studied. A high CO2 content in the natural gases of the reservoir suggests that the solvent was carbonic acid formed from CO2 generated during thermal maturation of organic matter. Calcite dissolution probably occurred between 70° and 100°C.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 4 , October 1986 , pp. 497 - 511
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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