Étude des réservoirs géothermiques développés dans le socle et à l’interface avec les formations sédimentaires

Abstract : High temperature geothermal projects for electricity production are in France mostly localized in the basement of basins linked to the West European Rifting event. The basement of theses basins have been studied on two outcrop analogues at the shoulders of the rift: the Northern Vosges mountains for the Upper Rhine Graben and the Eastern border of the Massif central for the Valence Graben. This study has shown that the fault network is organized in three orders of size with characteristic length and spacing, and that form characteristic structural blocks. The orientation and spacing of these faults and the presence or absence of some size orders are the result of structural inheritance of the basement and the mechanism of the basin opening. The reservoir potential of the basement rocks and the surrounding sedimentary cover has been analysed in light of the fault zones structure and the weathered layer at the top of the basement. Thus, the basement rocks of the basins has been classified in light of the potential of matrix porosity and permeability development in the fault core, the damaged zone and the fractured protolith. The evolution of the fracture network in the fault zone has been studied too, with the development of a double-porosity model in order to characterize the fracture porosity and permeability, and therefore simulate the working of a geothermal doublet in a synthethic fault zone analogue of the geothermal drilling targets
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Submitted on : Tuesday, April 17, 2018 - 1:03:04 AM
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  • HAL Id : tel-01757928, version 1

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Lionel Bertrand. Étude des réservoirs géothermiques développés dans le socle et à l’interface avec les formations sédimentaires. Sciences de la Terre. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0056⟩. ⟨tel-01757928⟩

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