Fault sealing during deformation-band growth in porous sandstone

Abstract

Research Article| December 01, 2000 Fault sealing during deformation-band growth in porous sandstone Ian G. Main; Ian G. Main 1Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, Scotland Search for other works by this author on: GSW Google Scholar Ohmyoung Kwon; Ohmyoung Kwon 1Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, Scotland Search for other works by this author on: GSW Google Scholar Bryne T. Ngwenya; Bryne T. Ngwenya 1Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, Scotland Search for other works by this author on: GSW Google Scholar Stephen C. Elphick Stephen C. Elphick 1Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, Scotland Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (12): 1131–1134. https://doi.org/10.1130/0091-7613(2000)28<1131:FSDDGI>2.0.CO;2 Article history received: 08 May 2000 rev-recd: 07 Sep 2000 accepted: 15 Sep 2000 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Ian G. Main, Ohmyoung Kwon, Bryne T. Ngwenya, Stephen C. Elphick; Fault sealing during deformation-band growth in porous sandstone. Geology 2000;; 28 (12): 1131–1134. doi: https://doi.org/10.1130/0091-7613(2000)28<1131:FSDDGI>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract We present a simple geometric model for the evolution of fluid permeability during the sequential growth of deformation bands in an ideal elastic-brittle porous granular medium. The model is based on recent mechanical and microstuctural results from laboratory experiments on large (10 cm diameter) sandstone samples that reproduce field observation. The model assumes poroelastic compaction of the rock matrix in the prefailure stage, followed either by bulk shear-enhanced dilatancy or compaction in the postfailure stage, depending on confining pressure, and a constant-porosity shear zone that accumulates slip by sequentially increasing the number of discrete bands linearly with the inelastic strain. For large permeability contrasts between matrix and the deformation band, the model quantitatively explains the entire permeability cycle observed in bulk samples, including the apparent paradox of a negative correlation of bulk permeability with porosity during dilatant slip in the postfailure stage, as observed in recent laboratory tests. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.