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<datestamp>2018-01-11</datestamp>
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<title lang=en>Influence of fault rock foliation on fault zone permeability: The case of deeply buried arkosic sandstones (Gres d'Annot, southeastern France)</title>
<creator>CAVAILHES, Thibault</creator>
<creator>Sizun, Jean-Pierre</creator>
<creator>Labaume, Pierre</creator>
<creator>Chauvet, Alain</creator>
<creator>Buatier, Martine</creator>
<creator>Soliva, Roger</creator>
<creator>Mezri, Leila</creator>
<creator>Charpentier, Delphine</creator>
<creator>Leclere, Henri</creator>
<creator>Trave, Anna</creator>
<creator>Gout, Claude</creator>
<contributor>Bassins ; 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) - 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>
<contributor>B ; 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) - 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>Universitat de Barcelona (UB)</contributor>
<contributor>TOTAL-Scientific and Technical Center Jean Féger (CSTJF) ; Total</contributor>
<description>International audience</description>
<source>ISSN: 0149-1423</source>
<source>AAPG Bulletin</source>
<publisher>American Association of Petroleum Geologists</publisher>
<identifier>hal-00903428</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903428</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00903428</source>
<source>AAPG Bulletin, American Association of Petroleum Geologists, 2013, 97 (9), pp.1521-1543. 〈10.1306/03071312127〉</source>
<identifier>DOI : 10.1306/03071312127</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1306/03071312127</relation>
<language>en</language>
<subject lang=fr>gres d'Annot</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>We describe the structure, microstructure, and petrophysical properties of fault rocks from two normal fault zones formed in low-porosity turbiditic arkosic sandstones, in deep diagenesis conditions similar to those of deeply buried reservoirs. These fault rocks are characterized by a foliated fabric and quartz-calcite sealed veins, which formation resulted from the combination of the (1) pressure solution of quartz, (2) intense fracturing sealed by quartz and calcite cements, and (3) neoformation of synkinematic white micas derived from the alteration of feldspars and chlorite. Fluid inclusion microthermometry in quartz and calcite cements demonstrates fault activity at temperatures of 195degC to 268degC. Permeability measurements on plugs oriented parallel with the principal axes of the finite strain ellipsoid show that the Y axis (parallel with the foliation and veins) is the direction of highest permeability in the foliated sandstone (10-2 md for Y against 10-3 md for X, Z, and the protolith, measured at a confining pressure of 20 bars). Microstructural observations document the localization of the preferential fluid path between the phyllosilicate particles forming the foliation. Hence, the direction of highest permeability in these fault rocks would be parallel with the fault and subhorizontal, that is, perpendicular to the slickenlines representing the local slip direction on the fault surface. We suggest that a similar relationship between kinematic markers and fault rock permeability anisotropy may be found in other fault zone types (reverse or strike-slip) affecting feldspar-rich lithologies in deep diagenesis conditions.</description>
<date>2013-09</date>
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