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Book Chapter

Quartz Diagenesis in Layered Fluids in the South Brae Oilfield, North Sea

By
Orla M. McLaughlin
Orla M. McLaughlin
Department of Geology and Applied Geology, University of Glasgow, Lilybank Gardens, Glasgow, GÌ2 8QQ, Scotland
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R. Stuart Haszeldine
R. Stuart Haszeldine
Department of Geology and Applied Geology, University of Glasgow, Lilybank Gardens, Glasgow, GÌ2 8QQ, Scotland
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Anthony E. Fallick
Anthony E. Fallick
Scottish Universities Research and Reactor Centre, Isotope Geosciences Unit, East Kilbride, G75 OQU, Scotland
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Published:
January 01, 1996

Abstract

The South Brae reservoir sandstones were cemented by quartz late in their diagenetic history. The volume of quartz cement in the South Brae sandstones ranges from 0 (in early calcite cemented concretions) to approximately 11%, wifh a mean of 3.5%. In four studied wells, quartz overgrowth δ180 decreases with increasing depth and demonstrates a control by the sedimentological reservoir layering of the field. The data indicate that ali overgrowths in any one well cannot have precipitated from a single pore fluid. Overgrowths in shallow reservoir sandstones have precipitated from a higher δ18O fluid (basinal, δ18O + 5‰) than overgrowths in deeper reservoir sandstones (evolved meteoric, δ18O «= – 7 to +5‰). This long-term layering of diagenetic fluids also implies that quartz cernent can be formed from local sources: advective transport by warm fluids is not required. The greatest volume of quartz is inlerpreted to have precipitated at temperatures between 70°C and 110°C (2.3 to 3.7 km). Quartz cementation probably occurred most rapidly during periods of overpressure release. Volumes of quartz cement are not significamly different in shallower and deeper reservoir sandstones.

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SEPM Special Publication

Siliciclastic Diagenesis and Fluid Flow: Concepts and Applications

Laura J. Crossey
Laura J. Crossey
University of New Mexico Albuquerque NM
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Robert Loucks
Robert Loucks
ARCO Exploration Production Technology Piano TX
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Matthew W. Totten
Matthew W. Totten
University of New Orleans New Orleans LA
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Peter A Scholle
Peter A Scholle
Editor of Special Publications Special Publication No 55
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SEPM Society for Sedimentary Geology
Volume
55
ISBN electronic:
9781565761780
Publication date:
January 01, 1996

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