The effect of faults on the 3D connectivity of reservoir bodies; a case study from the East Pennine Coalfield, UK

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doi: 10.1144/petgeo.8.3.263
Authors:Bailey, W. R.; Manzocchi, T.; Walsh, J. J.; Keogh, K.; Hodgetts, D.; Rippon, J.; Nell, P. A. R.; Flint, S.; Strand, J. A.
Author Affiliations:Primary:
University College Dublin, Department of Geology, Dublin, Ireland
Other:
University of Liverpool, United Kingdom
International Mining Consultants, United Kingdom
Volume Title:Petroleum Geoscience
Source:Petroleum Geoscience, 8(3), p.263-277. Publisher: Geological Society Publishing House, London, United Kingdom. ISSN: 1354-0793
Publication Date:2002
Note:In English. 33 refs.; illus., incl. strat. col., 1 table, geol. sketch map
Summary:The connectivity of reservoir bodies has been tested in unfaulted and variably faulted, high resolution 3D geocellular stratigraphic models (16 million cells in a 20 km × 20 km × c. 600 m volume) from the East Pennine Coalfield, UK. These deterministic stratigraphic-structural models are underpinned by high density borehole and mineplan data. The stratigraphy extends from mid-Westphalian A to base Westphalian C and represents a low net:gross (0.03-0.27) coal-bearing, delta top/fluvial reservoir analogue. The models contain up to 1467 post-depositional normal faults with maximum displacements ranging from 1 m to 140 m. Using two sets of facies as net, the effect of fault size on inferred reservoir connectivity has been assessed for stratal intervals with different sedimentary architecture, interval net:gross and thickness. Faults often disconnect reservoirs in thinner, lower net:gross intervals containing only laterally discontinuous, channelized bodies. By contrast, faults generally increase reservoir connectivity in thick, relatively high net:gross intervals containing laterally extensive, tabular reservoir bodies. The most significant factor for fault-related reservoir connectivity is the dimensionality and scale of reservoir bodies in relation to the displacement distribution along faults. Populations of small, sub-seismic, faults (<5 m throw) can reconnect reservoir bodies that are dissected by larger displacement, seismic resolvable, faults (>20 m throw).
Sections:Petrology
Subsections:Sedimentary petrology
Subjects:Carboniferous; Clastic rocks; Faults; Hydraulic conductivity; Natural gas; Naturally fractured reservoirs; Paleozoic; Petroleum; Petroleum exploration; Reservoir rocks; Sedimentary rocks; Silesian; Siltstone; Three-dimensional models; Upper Carboniferous; Westphalian; England; Europe; Great Britain; Pennines; United Kingdom; Western Europe; East Pennine coal field
Coordinates:N320000 N440000 E0560000 E0400000
Abstract Numbers:03M/2209
Record ID:2002081822
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
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