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<datestamp>2018-01-11</datestamp>
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<title lang=en>The importance of the degree of cataclasis in shear bands for fluid flow in porous sandstone, Provence, France</title>
<creator>BALLAS, Gregory</creator>
<creator>Soliva, Roger</creator>
<creator>Sizun, Jean-Pierre</creator>
<creator>Benedict, Antonio</creator>
<creator>CAVAILHES, Thibault</creator>
<creator>Raynaud, Suzanne</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Chrono-environnement (LCE) ; Université Bourgogne Franche-Comté (UBFC) - Centre National de la Recherche Scientifique (CNRS) - Université de Franche-Comté (UFC)</contributor>
<description>International audience</description>
<source>ISSN: 0149-1423</source>
<source>AAPG Bulletin</source>
<publisher>American Association of Petroleum Geologists</publisher>
<identifier>hal-00766557</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00766557</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00766557</source>
<source>AAPG Bulletin, American Association of Petroleum Geologists, 2012, 96 (11), pp.2167-2186. 〈10.1306/04051211097〉</source>
<identifier>DOI : 10.1306/04051211097</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1306/04051211097</relation>
<language>en</language>
<subject lang=en>shear band</subject>
<subject lang=en>sandstone</subject>
<subject lang=en>Provence</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Determination of the membrane seal capacity of deformation bands is critical for managing geologic reservoirs in porous sandstones. In this study, we have analyzed a cataclastic shear-band network developed in uncemented porous sandstone in Provence, France. Geometrical analyses of the bands show significant differences between three types of bands (single strand, multistrand, and band cluster), sorted by their number of strands, their amount of shear displacement, and their thicknesses. At the microscopic scale, the image-analysis porosities and the grain-size distributions allow definition of three different types of microstructural deformation: damage zone, protocataclastic, and cataclastic. Whereas damage zone and protocataclastic deformations are observed in each type of band, cataclastic strands are observed in clusters and, sometimes, in multistrands. Cataclastic strands are characterized by a porosity reduction of 10 to 25% and a permeability reduction of three to five orders of magnitude compared to the host rock. Field observations of iron hydroxide precipitations around the bands suggest that cataclastic strands were membrane seals to water flow under vadose condition. This study therefore highlights the importance of the degree of cataclasis in shear bands as membrane seals to subsurface fluid flows in sandstone reservoirs.</description>
<date>2012-11</date>
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