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Effective flow properties of heterolithic, cross-bedded tidal sandstones: Part 1. Surface-based modeling

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Title: Effective flow properties of heterolithic, cross-bedded tidal sandstones: Part 1. Surface-based modeling
Authors: Massart, BYG
Jackson, MD
Hampson, GJ
Johnson, HD
Legler, B
Jackson, CA-L
Item Type: Journal Article
Abstract: Tidal heterolithic sandstones are commonly characterized by millimeter- to centimeter-scale intercalations of mudstone and sandstone. Consequently, their effective flow properties are poorly predicted by (1) data that do not sample a representative volume or (2) models that fail to capture the complex three-dimensional architecture of sandstone and mudstone layers. We present a modeling approach in which surfaces are used to represent all geologic heterogeneities that control the spatial distribution of reservoir rock properties (surface-based modeling). The workflow uses template surfaces to represent heterogeneities classified by geometry instead of length scale. The topology of the template surfaces is described mathematically by a small number of geometric input parameters, and models are constructed stochastically. The methodology has been applied to generate generic, three-dimensional minimodels (9 m3 volume) of cross-bedded heterolithic sandstones representing trough and tabular cross-bedding with differing proportions of sandstone and mudstone, using conditioning data from two outcrop analogs from a tide-dominated deltaic deposit. The minimodels capture the cross-stratified architectures observed in outcrop and are suitable for flow simulation, allowing computation of effective permeability values for use in larger-scale models. We show that mudstone drapes in cross-bedded heterolithic sandstones significantly reduce effective permeability and also impart permeability anisotropy in the horizontal as well as vertical flow directions. The workflow can be used with subsurface data, supplemented by outcrop analog observations, to generate effective permeability values to be derived for use in larger-scale reservoir models. The methodology could be applied to the characterization and modeling of heterogeneities in other types of sandstone reservoirs.
Issue Date: 30-May-2016
Date of Acceptance: 4-Feb-2016
URI: http://hdl.handle.net/10044/1/38853
DOI: https://dx.doi.org/10.1306/02011614221
ISSN: 0149-1423
Publisher: American Association of Petroleum Geologists
Start Page: 697
End Page: 721
Journal / Book Title: AAPG Bulletin
Volume: 100
Issue: 5
Copyright Statement: Copyright ©2016. The American Association of Petroleum Geologists. All rights reserved.
Sponsor/Funder: A/S Norske Shell
Funder's Grant Number: 4510933069
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
0403 Geology
0914 Resources Engineering And Extractive Metallurgy
Publication Status: Published
Appears in Collections:Earth Science and Engineering
Faculty of Engineering