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Fracture-Induced Permeability in Whitby Mudstone
[Image: see text] Shale host rock and containment potential are largely determined by the connected pore network in the rock, and the connection between the pore network and the naturally present or mechanically induced fracture network together determines the total bulk permeability. Pore connectiv...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American
Chemical Society
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7409142/ https://www.ncbi.nlm.nih.gov/pubmed/32628456 http://dx.doi.org/10.1021/acs.est.0c00557 |
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author | Houben, Maartje E. van Eeden, Jasmijn C. M. Barnhoorn, Auke Hangx, Suzanne J. T. |
author_facet | Houben, Maartje E. van Eeden, Jasmijn C. M. Barnhoorn, Auke Hangx, Suzanne J. T. |
author_sort | Houben, Maartje E. |
collection | PubMed |
description | [Image: see text] Shale host rock and containment potential are largely determined by the connected pore network in the rock, and the connection between the pore network and the naturally present or mechanically induced fracture network together determines the total bulk permeability. Pore connectivity in shales is poorly understood because most of the porosity is present in sub-micrometer-sized pores that are connected through nanometer-sized pore throats. We have used a number of different techniques to investigate the microstructure and permeability of Early Jurassic shales from the UK (Whitby Mudstone), under intact and fractured conditions. Whitby Mudstone is a clay matrix-rich rock (50–70%), with different mineralogical layers on the sub-millimeter scale and very low natural permeability (10(–19) to 10(–22) m(2)), representative of many gas shales and caprocks present in Europe. Artificial fracturing of this shale increases its permeability by 2–5 orders of magnitude at low confining pressure (5 MPa). At high confining pressures (30 MPa), permeability changes were more sensitive to the measuring direction with respect to the bedding orientation. Given the distinct lack of well-defined damage zones, most of the permeability increase is controlled by fracture permeability, which is sensitive to the coupled hydro-chemo-mechanical response of the fractures to fluids. |
format | Online Article Text |
id | pubmed-7409142 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American
Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-74091422020-08-07 Fracture-Induced Permeability in Whitby Mudstone Houben, Maartje E. van Eeden, Jasmijn C. M. Barnhoorn, Auke Hangx, Suzanne J. T. Environ Sci Technol [Image: see text] Shale host rock and containment potential are largely determined by the connected pore network in the rock, and the connection between the pore network and the naturally present or mechanically induced fracture network together determines the total bulk permeability. Pore connectivity in shales is poorly understood because most of the porosity is present in sub-micrometer-sized pores that are connected through nanometer-sized pore throats. We have used a number of different techniques to investigate the microstructure and permeability of Early Jurassic shales from the UK (Whitby Mudstone), under intact and fractured conditions. Whitby Mudstone is a clay matrix-rich rock (50–70%), with different mineralogical layers on the sub-millimeter scale and very low natural permeability (10(–19) to 10(–22) m(2)), representative of many gas shales and caprocks present in Europe. Artificial fracturing of this shale increases its permeability by 2–5 orders of magnitude at low confining pressure (5 MPa). At high confining pressures (30 MPa), permeability changes were more sensitive to the measuring direction with respect to the bedding orientation. Given the distinct lack of well-defined damage zones, most of the permeability increase is controlled by fracture permeability, which is sensitive to the coupled hydro-chemo-mechanical response of the fractures to fluids. American Chemical Society 2020-07-06 2020-08-04 /pmc/articles/PMC7409142/ /pubmed/32628456 http://dx.doi.org/10.1021/acs.est.0c00557 Text en Copyright © 2020 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Houben, Maartje E. van Eeden, Jasmijn C. M. Barnhoorn, Auke Hangx, Suzanne J. T. Fracture-Induced Permeability in Whitby Mudstone |
title | Fracture-Induced
Permeability in Whitby Mudstone |
title_full | Fracture-Induced
Permeability in Whitby Mudstone |
title_fullStr | Fracture-Induced
Permeability in Whitby Mudstone |
title_full_unstemmed | Fracture-Induced
Permeability in Whitby Mudstone |
title_short | Fracture-Induced
Permeability in Whitby Mudstone |
title_sort | fracture-induced
permeability in whitby mudstone |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7409142/ https://www.ncbi.nlm.nih.gov/pubmed/32628456 http://dx.doi.org/10.1021/acs.est.0c00557 |
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