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Evolution of small-scale flow barriers in German Rotliegend siliciclastics

By
Benjamin Busch
Benjamin Busch
Institute of Reservoir-Petrology, EMR – Energy and Mineral Resources Group, RWTH Aachen University, Wuellnerstraße 2, 52062 Aachen, Germany
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Rebecca Winkler
Rebecca Winkler
Institute of Reservoir-Petrology, EMR – Energy and Mineral Resources Group, RWTH Aachen University, Wuellnerstraße 2, 52062 Aachen, Germany
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Keyvan Osivandi
Keyvan Osivandi
RWE DEA AG, Hamburg, Ueberseering 40, 22297 Hamburg, Germany
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Georg Nover
Georg Nover
Steinmann-Institute of Geology, Mineralogy und Palaeontology, University Bonn, Meckenheimer Allee 169, 53115 Bonn, Germany
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Alexandra Amann-Hildenbrand
Alexandra Amann-Hildenbrand
Institute of Geology and Geochemistry of Petroleum and Coal, EMR – Energy and Mineral Resources Group, RWTH Aachen University, Lochnerstraße 4-20 (House B), 52062 Aachen, Germany
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Christoph Hilgers
Christoph Hilgers
Institute of Reservoir-Petrology, EMR – Energy and Mineral Resources Group, RWTH Aachen University, Wuellnerstraße 2, 52062 Aachen, Germany
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Published:
January 01, 2018

Abstract:

Many siliciclastic reservoirs contain millimetre-scale diagenetic and structural phenomena affecting fluid flow. We identified three major types of small-scale flow barriers in a clastic Rotliegend hydrocarbon reservoir: cataclastic deformation bands; dissolution seams; and bedding-parallel cementation. Deformation bands of various orientations were analysed on resistivity image logs and in core material. They are mainly conjugates, and can be used to validate seismically observable faults and infer subseismic faults. Bedding-parallel dissolution seams are related to compaction and post-date at least one set of deformation bands. Bedding-parallel cementation is accumulated in coarser-grained layers and depends on the amount of clay coatings.

Apparent permeability data related to petrographical image interpretation visualizes the impact of flow barriers on reservoir heterogeneity. Transmissibility multiplier calculations indicate the small efficiency of the studied deformation bands on flow properties in the reservoir. Deformation bands reduce the host-rock permeability by a maximum of two orders of magnitude. However, host-rock anisotropies are inferred to reduce the permeability by a maximum of four orders of magnitude. The relative timing of these flow barriers, as well as the assessment of reservoir heterogeneities, are the basis for state-of-the-art reservoir prediction modelling.

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Geological Society, London, Special Publications

Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction

P. J. Armitage
P. J. Armitage
BP Upstream Technology, UK
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A. R. Butcher
A. R. Butcher
Geological Survey of Finland, Finland
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J.M. Churchill
J.M. Churchill
Shell UK Ltd, UK
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A.E. Csoma
A.E. Csoma
MOL Group Exploration, Hungary
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C. Hollis
C. Hollis
University of Manchester, UK
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R. H. Lander
R. H. Lander
Geocosm, USA
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J. E. Omma
J. E. Omma
Rocktype, UK
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R. H. Worden
R. H. Worden
University of Liverpool, UK
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The Geological Society of London
Volume
435
ISBN electronic:
9781786202901
Publication date:
January 01, 2018

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