eprintid: 1855 rev_number: 10 eprint_status: archive userid: 6 dir: disk0/00/00/18/55 datestamp: 2017-03-02 11:18:13 lastmod: 2017-03-02 11:18:13 status_changed: 2017-03-02 11:18:13 type: article metadata_visibility: show creators_name: Sanjuan, Bernard creators_name: Millot, Romain creators_name: Dezayes, Chrystel creators_name: Brach, Michel corp_creators: BRGM, Department of Geothermal Energy,France corp_creators: BRGM, Department of Geothermal Energy,France corp_creators: BRGM, Department of Geothermal Energy,France corp_creators: BRGM, Department of Geothermal Energy,France title: Main characteristics of the deep geothermal brine (5km) at Soultz-sous-Forêts (France) determined using geochemical and tracer test data subjects: O subjects: RF1 subjects: SG divisions: IP4 full_text_status: none keywords: Heat exchanger; EGS reservoir; Well; Fluid; Geochemical analyses; Tracer tests; Circulation abstract: Three deep wells (5000 m) have been drilled into a fractured granite basement at Soultz-sous-Forêts, within the Tertiary Rhine Graben, in order to develop a heat exchanger and produce electricity after the creation of an EGS reservoir. Very few analyses representative of the deep geothermal fluids are available because of frequent contamination by drilling fluids or injected waters. These indicate similar chemical and isotopic compositions (NaCl fluids) and high salinities (about 100 g/l) suggesting a common sedimentary origin and identical water–rock interaction processes at equilibrium temperatures close to 230 °C in a sedimentary rather than a granite reservoir. The latter would be situated closer to the Graben centre where the Triassic Buntsandstein formation is deepest and hottest. Tracer tests conducted after 2000 show that the deep native geothermal brine is omnipresent in the fluids discharged during the production and circulation tests. Its natural convective flux was estimated at 1–1.2 m3/h. date: 2010 date_type: published publication: Comptes Rendus Geoscience volume: 342 number: 7-8 publisher: Elsevier pagerange: 546-559 id_number: doi:10.1016/j.crte.2009.10.009 issn: 1631-0713 official_url: http://doi.org/10.1016/j.crte.2009.10.009 access_IS-EPOS: limited owner: Publisher citation: Sanjuan, Bernard and Millot, Romain and Dezayes, Chrystel and Brach, Michel (2010) Main characteristics of the deep geothermal brine (5km) at Soultz-sous-Forêts (France) determined using geochemical and tracer test data. Comptes Rendus Geoscience, 342 (7-8). pp. 546-559. DOI: https://doi.org/10.1016/j.crte.2009.10.009