@article{epos1859,
          volume = {342},
          number = {7-8},
          author = {Chrystel Dezayes and Albert Genter and Beno{\^i}t Valley},
           title = {Structure of the low permeable naturally fractured geothermal reservoir at Soultz},
       publisher = {Elsevier},
         journal = {Comptes Rendus Geoscience},
           pages = {517--530},
            year = {2010},
        keywords = {Rhine Graben; Fractures; Fracture zones; Cores; Borehole images; Enhanced Geothermal System},
             url = {https://episodesplatform.eu/eprints/1859/},
        abstract = {The permeability of the granite geothermal reservoir of Soultz is primarily related to major fracture zones, which, in turn, are connected to dense networks of small-scale fractures. The small-scale fractures are nearly vertical and the major direction is about N0?E. This direction differs from that of the Rhine Graben, which is about N20?E to N45?E in northern Alsace. A total of 39 fracture zones, with a general strike of N160?E, have been identified in six wells between 1400 and 5000 m depth. These fracture zones are spatially concentrated in three clusters. The upper cluster at 1800?2000 m True Vertical Depth (TVD) is highly permeable. At 3000?3400 m TVD, the intermediate cluster in composed of a dense network developed in an altered matrix and forms the upper reservoir. In the lower part of the wells, the deeper cluster appears as a fractured reservoir developed within a low permeable matrix. Fracture zones represent a key element to take into account for predicting the geothermal reservoir life time submitted to various thermo-hydromechanical and chemical processes generated by hydraulic or chemical stimulations and by hydraulic circulation tests related to long-term exploitation.}
}