Dezayes, Chrystel and Genter, Albert and Valley, Benoît (2010) Structure of the low permeable naturally fractured geothermal reservoir at Soultz. Comptes Rendus Geoscience, 342 (7-8). pp. 517-530. DOI: https://doi.org/10.1016/j.crte.2009.10.002
Full text not available from this repository.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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Rhine Graben; Fractures; Fracture zones; Cores; Borehole images; Enhanced Geothermal System |
| Subjects: | Methodology > Method and procesing > Collective properties of seismicity Region > France > Soultz-sous-Forets Inducing technology > Geothermal energy production |
| Project: | EPOS-IP > SOULTZ-SOUS-FORETS: stimulation and production of geothermal energy |