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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: 3D pore microstructures and computer simulation : effective permeabilities and capillary pressure during drainage in Opalinus Clay
Authors: Keller, Lukas M.
et. al: No
DOI: 10.2516/ogst/2021027
Published in: Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
Volume(Issue): 76
Issue: 44
Issue Date: 2021
Publisher / Ed. Institution: IFP Energies nouvelles
ISSN: 1294-4475
Language: English
Subject (DDC): 551: Geology and hydrology
Abstract: The 3D reconstruction of the pore space in Opalinus Clay is faced with the difficulty that high-resolution imaging methods reach their limits at the nanometer-sized pores in this material. Until now it has not been possible to image the whole pore space with pore sizes that span two orders of magnitude. Therefore, it has not been possible to predict the transport properties of this material with the help computer simulations that require 3D pore structures as input. Following the concept of self-similarity, a digital pore microstructure was constructed from a real but incomplete pore microstructure. The constructed pore structure has the same pore size spectrum as measured in the laboratory. Computer simulations were used to predict capillary pressure curves during drainage, which also agree with laboratory data. It is predicted, that two-phase transport properties such as the evolution of effective permeability as well as capillary pressures during drainage depend both on transport directions, which should be considered for Opalinus Clay when assessing its suitability as host rock for nuclear waste. This directional dependence is controlled on the pore scale by a geometric anisotropy in the pore space.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Published as part of the ZHAW project: EURAD-WP-Gas: Mechanistic understanding of gas transport in clay materials
Appears in collections:Publikationen School of Engineering

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