Physical modelling of sub-salt gliding due to fluid overpressure in underlying sedimentary strata
Autor: | Dhaou Akrout, Peter R. Cobbold, Riadh Ahmadi, Eric Mercier, Mabrouk Montacer |
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Přispěvatelé: | Université de Gabès, Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Eau Energie et Environnement (LEEE), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
010504 meteorology & atmospheric sciences
Evaporite Stratigraphy 010502 geochemistry & geophysics Oceanography 01 natural sciences Brittleness Physical modelling Petrology [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology sub-salt gliding 0105 earth and related environmental sciences Shearing (physics) geography Gulf of Mexico geography.geographical_feature_category Geology Sedimentary basin Overpressure Geophysics Analogue modelling Economic Geology Sedimentary rock Submarine pipeline offshore Brazil fluid overpressure Seismology |
Zdroj: | Marine and Petroleum Geology Marine and Petroleum Geology, 2016, 72, pp.139-155. ⟨10.1016/j.marpetgeo.2016.01.019⟩ Marine and Petroleum Geology, Elsevier, 2016, 72, pp.139-155. ⟨10.1016/j.marpetgeo.2016.01.019⟩ |
ISSN: | 0264-8172 |
Popis: | International audience; The Gulf of Mexico and the offshore Campos and Santos basins of Brazil provide good examples of sub-salt detachments, by shearing in the presence of overpressure. We have developed new physical models of such situations, including layers of ductile silicone putty, which simulated an evaporite, and fluid overpressure in porous brittle layers. We studied two configurations, in which the maximal overpressure was either beneath a single ductile layer of silicone (simulating salt), or between two such layers of silicone (simulating an evaporite sequence). The results of our analogue modelling showed that detachment faults appeared and persisted at the bases of the ductile layers, even though some ductile deformation occurred simultaneously within these layers. For models where maximal overpressure was between two ductile layers, detachment occurred mainly at the base of the upper silicone layer. On comparing our models with structures in the Gulf of Mexico or offshore Brazil, we find strong similarities, which lead us to suspect that detachment is indeed possible at the base of an evaporite sequence in nature. This conclusion has strong implications, not only for the understanding of petroleum systems, but also for better management of petroleum productionin sedimentary basins. |
Databáze: | OpenAIRE |
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