Main characteristics of the deep geothermal brine (5km) at Soultz-sous-Forêts (France) determined using geochemical and tracer test data

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

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Official URL: http://doi.org/10.1016/j.crte.2009.10.009

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.

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Item Type: Article
Uncontrolled Keywords: Heat exchanger; EGS reservoir; Well; Fluid; Geochemical analyses; Tracer tests; Circulation
Subjects: Methodology > Other-additional study
Region > France > Soultz-sous-Forets
Inducing technology > Geothermal energy production
Project: EPOS-IP > SOULTZ-SOUS-FORETS: stimulation and production of geothermal energy