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Reservoir characteristics of fault-controlled hydrothermal dolomite bodies: Ramales Platform case study

By
J. Dewit
J. Dewit
Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium
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M. Huysmans
M. Huysmans
Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium
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Ph. Muchez
Ph. Muchez
Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium
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D. W. Hunt
D. W. Hunt
Statoil Research Center Bergen, Statoil A.S.A., Sandsliveien 90, 5020 Bergen, Norway
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J. B. Thurmond
J. B. Thurmond
Statoil Research Center Bergen, Statoil A.S.A., Sandsliveien 90, 5020 Bergen, Norway
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J. Verges
J. Verges
Dynamics of the lithosphere – GDL, Institute of Earth Sciences ‘Jaume Almera’, CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
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E. Saura
E. Saura
Dynamics of the lithosphere – GDL, Institute of Earth Sciences ‘Jaume Almera’, CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
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N. Fernandez
N. Fernandez
Dynamics of the lithosphere – GDL, Institute of Earth Sciences ‘Jaume Almera’, CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
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I. Romaire
I. Romaire
Dynamics of the lithosphere – GDL, Institute of Earth Sciences ‘Jaume Almera’, CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
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P. Esestime
P. Esestime
Dynamics of the lithosphere – GDL, Institute of Earth Sciences ‘Jaume Almera’, CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
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R. Swennen
R. Swennen
Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium
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Published:
January 01, 2012

Abstract

Hydrothermal dolomite (HTD) bodies are known as high-quality hydrocarbon reservoirs; however few studies focus on the geometry and distribution of reservoir characteristics. Across the platform-to-basin transition of the Ramales Platform, fault-controlled HTD bodies are present. Three kinds of bodies can be distinguished based on their morphology, that is, elongated HTD corridors, a massive HTD body (Pozalagua body) and an HTD-cemented breccia body. The differences in size and shape of the HTD bodies can be attributed to differences in local structural setting. For the Pozalagua body, an additional sedimentological control is invoked to explain the difference in HTD geometry.

A (geo)-statistical investigation of the reservoir characteristics in the Pozalagua body revealed that the HTD types (defined based on their texture) show spatial clustering controlled by the orientation of faults, joints and the platform edge. Porosity and permeability values are distributed in clusters of high and low values; however, they are not significantly different for the three HTD types. Two dolomitization phases (i.e. ferroan and non-ferroan) can be observed in all HTD bodies. In general, the HTDs resulting from the second non-ferroan dolomitization phase have lower porosity values. No difference in permeability is found for the ferroan and non-ferroan dolomites.

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Geological Society, London, Special Publications

Advances in Carbonate Exploration and Reservoir Analysis

J. Garland
J. Garland
Cambridge Carbonates Ltd, UK
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J. E. Neilson
J. E. Neilson
University of Aberdeen, UK
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S. E. Laubach
S. E. Laubach
University of Texas at Austin, USA
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K. J. Whidden
K. J. Whidden
USGS, USA
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Geological Society of London
Volume
370
ISBN electronic:
9781862396180
Publication date:
January 01, 2012

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