La sismicité induite par l'extraction de l'énergie géothermique du site de Soultez-sous-Forêts : ela méthode des doublets : un outil d'aide à l'étude du comportement du réservoir

Abstract : The extraction of the geothermal energy stored in the hot dry rocks is a not polluting concept. more than ever of topicality in spite of extreme conditions of operation which make very difficult the characterization of the hydraulic behavior of the rocks - fractures system. The injection of water under pressure generates a microseismic activity prone to a sounding and an analysis with an aim in particular of estimating dimensions of the network of fractures. lt is within this framework that on the site of Soultz-Sous-Forêts a microseismic survey network is set up. We show initially that the cloud formed by the focuses determined by two classical methods of localization has an orientation in agreement with the in situ state of constraints. But this cloud is too diffuse to highlight individual structures. Thereafter, the use of the doublets method in the analysis of the microseismic events enables us to arrive at more interesting results : • each doublet (multiplet) corresponds to a fracture, which makes it possible to characterize the fracture in a specifie way : • within the same doublet (multiplet) the microseismic events are realigned both in time and space. Thus giving a precise image of the propagation of the rupture in the rocks; • the relative distances between the focuses of the events of a same doublet (multiplet) give a first estimate of the size of the sources confirmed by the study of the seismic moments tensors
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http://docnum.univ-lorraine.fr/prive/INPL_T_1998_DODO_AMADOU_A.pdf
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Submitted on : Thursday, March 29, 2018 - 1:40:44 PM
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Aboubacar Dodo Amadou. La sismicité induite par l'extraction de l'énergie géothermique du site de Soultez-sous-Forêts : ela méthode des doublets : un outil d'aide à l'étude du comportement du réservoir. Autre. Institut National Polytechnique de Lorraine, 1998. Français. ⟨NNT : 1998INPL105N⟩. ⟨tel-01752307⟩

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