Colombera, L orcid.org/0000-0001-9116-1800, Mountney, NP orcid.org/0000-0002-8356-9889, Medici, G et al. (1 more author) (2019) The geometry of fluvial channel bodies: Empirical characterization and implications for object-based models of the subsurface. AAPG Bulletin, 103 (4). pp. 905-929. ISSN 0149-1423
Abstract
The distribution of channel deposits in fluvial reservoirs is commonly modeled with object-based techniques, constrained on quantities describing the geometries of channel bodies. To ensure plausible simulations, it is common to define inputs to these models by referring to geologic analogs. Given their ability to reproduce complex geometries and to draw upon the analog experience, object-based models are considered inherently realistic. Yet this perceived realism has not hitherto been tested by assessing the outputs of these techniques against sedimentary architectures in the stratigraphic record.
This work presents a synthesis of data on the geometry of channel bodies, derived from a sedimentologic database, with the following aims: (1) to provide tools for constraining stochastic models of fluvial reservoirs in data-poor situations, and (2) to test the intrinsic realism of object-based modeling algorithms by comparing characteristics of the modeled architectures against analogs.
An empirical characterization of the geometry of fluvial channel bodies is undertaken that describes distributions in (and relationships among) channel-body thickness, cross-stream width, and planform wavelength and amplitude. Object-based models are then built running simulations conditioned on six alternative, analog-informed parameter sets, using four algorithms according to nine different approaches. Closeness of match between analogs and models is then determined on a statistical basis.
Results indicate which modeling approaches return architectures that more closely resemble the organization of fluvial depositional systems known from nature and in what respect. None of the tested algorithms fully reproduce characteristics seen in natural systems, demonstrating the need for subsurface modeling methods to better incorporate geologic knowledge.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright © 2019. The American Association of Petroleum Geologists. All rights reserved. This is an author produced version of a paper published in AAPG Bulletin. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | fluvial architecture; channel; alluvial aquifer; fluvial reservoir; reservoir model; aquifer model |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Funding Information: | Funder Grant number Total E&P UK Ltd No External Ref NERC NE/M007324/1 Shell International No External Ref NERC NE/N017218/1 NERC NE/P01691X/1 Nexen Petroleum UK Ltd Not Known |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Oct 2018 10:42 |
Last Modified: | 01 Apr 2020 00:38 |
Status: | Published |
Publisher: | American Association of Petroleum Geologists |
Identification Number: | 10.1306/10031817417 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:136713 |