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Relations architecturales, faciologiques et diagénétiques des carbonates bioclastiques du bassin miocène rhodano-provençal (SE France)

Abstract : During the Miocene, the Rhone-Provence Molassic Basin is situated at mid paleolatitude. This alpine foreland basin records an outstanding bioclastic sedimentary system, infilling incised valleys. The study of the Vénasque (Aquitanian-Langhien) and the Martigues (Aquitanian-Tortonian) outcrops constitute the core of this PhD. The objective is to study the bioclastic sedimentary system (petrography, sedimentary architecture, depositional setting and diagenesis) and determine its reservoir potential. After the formation of fluvial valleys during eustatic falls, the sediments are deposited in a strictly submarine tidal-dominated setting. These deposits alternate bioclastic carbonates and mudstones intervals. They represent transgressive intervals and highstand system tracts respectively. The bioclastic parts have the best reservoir potential but are characterised by a strong internal heterogeneity. This heterogeneity results from a combination of hydrodynamic, ecological and diagenetic settings which are associated with the tectono-eustatic cycles. The construction of a precise sequential scheme including the diagenesis evolution allows characterizing the potential of the bioclastic reservoirs confined in submarine valleys. The deposits of Rhone-Provence Miocene constitute an exceptional outcrop analogue for the understanding of such reservoirs currently implied in petroleum systems.
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Submitted on : Monday, February 7, 2011 - 2:15:10 PM
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  • HAL Id : pastel-00563849, version 1

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Pierre-Yves Descote. Relations architecturales, faciologiques et diagénétiques des carbonates bioclastiques du bassin miocène rhodano-provençal (SE France). Stratigraphie. École Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0016⟩. ⟨pastel-00563849⟩

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