Control of tectonic setting and large-scale faults on the basin-scale distribution of deformation bands in porous sandstone (Provence,France) |
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| Institution: | 1. U.M.R. C.N.R.S. 5243 Géosciences Montpellier, University of Montpellier II, U.F.R. Sciences et Techniques, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France;2. AREVA NC, BU Mines Direction Géosciences, 92084, La Défense, Paris, France;3. U.M.R. C.N.R.S. 6249 Chrono-Environnement, Département Géosciences, U.F.R. Sciences et Techniques, University of Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France;1. Aix-Marseille Université, CNRS, IRD, CEREGE UM34, 13545 Aix-en-Provence, France;2. 19 chemin du Champ Juvénal, 34170 Castelnau-le-Lez, France;3. GEOTER SAS, FUGRO Group, 3 rue Jean Monnet, 34830 Clapiers, France;4. Section of Earth and Environmental Sciences, University of Geneva, 13 rue des Maraîchers, CH-1205 Geneva, Switzerland;5. Sorbonne Universités, UPMC Univ. Paris 06, UMR 7193, Institut des Sciences de la Terre Paris (iSTeP), 75005 Paris, France;6. CNRS, UMR 7193, Institut des Sciences de la Terre Paris (iSTeP), 75005 Paris, France;7. Université de Bretagne Occidentale, IUEM, Domaines océaniques, UMR 6538 CNRS, 1 place Nicolas Copernic, 29280 Plouzané, France;8. GNS Science, Ocean Exploration Section, P.O. BOX 30368, Lower Hutt 5040, New, Zealand;9. DREAL Centre, SHPEC/DHMD, 5 Avenue Buffon, 45064 Orléans La Source, Cedex 2, France;10. Department of Geosciences, Building #77, University of Arizona, Tucson, AZ 85721, USA;11. Department of Geology, University of Florida, Gainesville, FL 32611, USA;12. TOTAL, TG/ISS, CSTJF, Avenue Laribeau, 64018 Pau Cedex, France;13. GeoBioStratData.Consulting, 385 route du Mas Rillier, 69140 Rillieux la Pape, France;14. National Science Foundation, Washington, DC, USA;1. State Key Laboratory of Petroleum Resources and Prospecting, Beijing, 102249, China;2. College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China;1. Department of Geology, University of Otago, PO Box 56, Dunedin, 9054, New Zealand;2. School of Geography, Environment, and Earth Sciences, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand;3. GNS Science, PO Box 30-368, Lower Hutt, 5040, New Zealand;4. Department of Mathematics and Statistics, University of Otago, PO Box 56, Dunedin, 9054, New Zealand;1. Schlumberger Technology Corporation, Sugar Land, TX, USA;2. Centre for Energy, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, WA, Australia |
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| Abstract: | From outcrops located in Provence (South-East France), we describe the distribution, the microstructures, and the petrophysical properties of deformation band networks related to both contractional and extensional tectonic events. In contraction, pervasively distributed networks of reverse-sense compactional shear bands are observed in all folded sand units of the foreland, whereas localized networks of clustered reverse-sense shear bands are only observed close to a large-scale thrust. In extensional setting, networks of clustered normal-sense shear bands are generally observed adjacent to map-scale faults (100 m–10 km scale), although some randomly distributed bands are also observed between these faults. Normal-sense cataclastic faults, i.e. zone of deformation bands containing a localized slip-surface, are also observed to be restricted to sand units, suggesting that faults initiated in the sands during extension, but not during contraction. Shear bands and faults show cataclastic microstructures with high-permeability reduction whereas compactional shear bands show crush microbreccia or protocataclastic microstructures with moderate permeability reduction. This basin-scale analysis underlines the major role of tectonic settings (thrust-fault versus normal-fault andersonian-stress regime) and the influence of inherited large-scale faults on the formation/localization of low-permeability shear bands. We also provide a geometrical analysis of the band network properties (spacing, thickness, shear/compaction ratio, degree of cataclasis, petrophysical properties) with respect to the median grain size, porosity and grain sorting of host sand. This analysis suggests that grain size, although less important than stress-state conditions and the presence of large-scale faults, has a non-negligible effect on band network geometry. No correlations are observed between the grain sorting, porosity and band network geometry. |
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| Keywords: | Deformation bands Porous sandstone Faulting Thrusting Cataclasis Permeability |
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