Effects of erosional scours on reservoir properties of heterolithic, distal lower shoreface sandstones
File(s)
Accepted version
Author(s)
Onyenanu, G
Hampson, GJ
Fitch, P
Jackson, MD
Type
Journal Article
Abstract
Distal intervals of interbedded sandstones and mudstones in shallow-marine, wave-dominated shoreface and deltaic reservoirs may contain significant hydrocarbon resources, but their reservoir properties are difficult to predict. Relatively small-scale (200 × 100 × 20 m) three-dimensional object-based reservoir models, conditioned to outcrop analogue data, have been used to investigate the controls on the proportion of sandstone, the proportion of sandstone beds that are connected by sandstone-filled erosional scours and the effective vertical-to-horizontal permeability ratio (kv/kh) of such intervals. The proportion of sandstone is controlled by sandstone-bed and mudstone-interbed thickness, and by parameters that describe the geometry, dimensions and lateral-stacking density of sandstone-filled scours. Sandstone-bed connectivity is controlled by the interplay between the thickness of mudstone interbeds and sandstone-filled erosional scours. Effective kv/kh is controlled by the proportion of sandstone, which represents the effects of variable distributions and dimensions of mudstones produced by scour erosion, provided that scour thickness is greater than mudstone-interbed thickness. These modelling results provide a means of estimating the effective kv/kh at the scale of typical reservoir-model grid cells using values of mudstone-interbed thickness and the proportion of sandstone that can potentially be provided by core data.
Date Issued
2019-05-01
Date Acceptance
2018-08-20
Citation
Petroleum Geoscience, 2019, 25 (2), pp.235-248
ISSN
1354-0793
Publisher
Geological Society
Start Page
235
End Page
248
Journal / Book Title
Petroleum Geoscience
Volume
25
Issue
2
Copyright Statement
© 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE. All rights reserved.
Identifier
https://pubs.geoscienceworld.org/pg/article-lookup?doi=10.1144/petgeo2018-058
Subjects
Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
EFFECTIVE FLOW PROPERTIES
BLACKHAWK FORMATION
BOOK CLIFFS
GRASSY MEMBER
UTAH
PARASEQUENCE
CONNECTIVITY
PERMEABILITY
LACUNARITY
DEPOSITS
Energy
0403 Geology
0914 Resources Engineering and Extractive Metallurgy
Publication Status
Published
Date Publish Online
2018-09-28