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Altérations hydrothermales associées aux zones de fractures à l'interface de la couverture sédimentaire et du socle cristallin dans le Fossé rhénan supérieur : application aux forages géothermiques de Rittershoffen (Alsace, France)

Abstract : The knowledge of the fracture network is a key challenge to understand the fluid circulation through a reservoir. The aim of this PhD project is to investigate the natural fracture network that channelized the hydrothermal circulations into two deep wells GRT-1 and GRT-2 at Rittershoffen (Alsace, France) that intersect Triassic sandstones and altered granitic basement in the framework of an industrial geothermal project. The structural study of the fracture network was based on acoustic image logs correlated with standard geophysical logs, whereas the mineralogical study was based on cutting samples. Permeable fracture zones of wells at Rittershoffen present an asymmetrical organization of permeability. Open fractures at the borehole scale act as fluid pathways surrounded by halos of hydrothermal alteration. These fracture zones are associated with local thermal anomalies in the temperature profiles at the borehole scale. Occurrences of heterogeneous illitic minerals could be a good indicator to prospect zones of actual and past circulations at the borehole scale.
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https://tel.archives-ouvertes.fr/tel-01768317
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Submitted on : Tuesday, April 17, 2018 - 10:33:07 AM
Last modification on : Friday, April 5, 2019 - 8:16:12 PM

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  • HAL Id : tel-01768317, version 1

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Jeanne Vidal. Altérations hydrothermales associées aux zones de fractures à l'interface de la couverture sédimentaire et du socle cristallin dans le Fossé rhénan supérieur : application aux forages géothermiques de Rittershoffen (Alsace, France). Sciences de la Terre. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAH008⟩. ⟨tel-01768317⟩

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