Diyokeugwu, A and Glover, P orcid.org/0000-0003-1715-5474 (2018) Grain-mixing modelling of the porosity and permeability of binary mixtures. In: SEG Technical Program Expanded Abstracts. SEG International Exposition and 88th Annual Meeting, 14-19 Oct 2018, Anaheim, California. Society of Exploration Geophysicists , pp. 3463-3467.
Abstract
The porosity and permeability of binary mixtures of spherical grains were modelled theoretically and studied empirically against such variables as grain-size, grain-size ratio, grain volume fraction and grain packing. The results confirmed that binary mixing of different-sized grains always results in a porosity loss. The degree of porosity loss was found to be a function of the grain-size ratio. Consequently, the mixture with the highest grain-size ratio of 3 dropped to the lowest minimum porosity of 0.3116 while the mixture with the minimum grain-size ratio of 1.5 experienced the highest minimum porosity of 0.3716. The observed porosities could not be described by some of the existing porosity models including the ideal and fractional packing models due to the assumptions of ideal packing and no-mixing respectively underlying these models. Thus, a corrected fine packing (or replacement) model was developed during this research to incorporate the grain-size ratio effect on porosity. Together with the interstitiation model, the corrected replacement model gave the best fit to the observed porosities. The mixtures' permeabilities could not be modelled by the grain-size/porosity-dependent permeability models because these models tend to mimic the trend of the representative porosity used. The weighted geometric/harmonic mean permeability models (weighted by volume fraction) described the observed permeabilities best.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Published in electronic format with permission by the Society of Exploration Geophysicists. This is an author produced version of a conference abstract published in SEG Expanded Abstracts. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | porosity, permeability, modeling, diagenesis, petrophysics |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Jul 2019 12:09 |
Last Modified: | 18 Oct 2019 01:29 |
Status: | Published |
Publisher: | Society of Exploration Geophysicists |
Identification Number: | 10.1190/segam2018-2975312.1 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147314 |