Main characteristics of the deep geothermal brine (5 km) at Soultz-sous-ForeTs (France) determined using geochemical and tracer test data - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Comptes Rendus Géoscience Année : 2010

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

(1) , (1) , (1) , (1)
1

Résumé

Three deep wells (5000 m) have been drilled into a fractured granite basement at Soultzsous- Foreˆts, 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 8C 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.
Fichier non déposé

Dates et versions

hal-00558838 , version 1 (24-01-2011)

Identifiants

Citer

Bernard Sanjuan, Romain Millot, Chrystel Dezayes, Michel Brach. Main characteristics of the deep geothermal brine (5 km) at Soultz-sous-ForeTs (France) determined using geochemical and tracer test data. Comptes Rendus Géoscience, 2010, 342, p. 546-559. ⟨10.1016/j.crte.2009.10.009⟩. ⟨hal-00558838⟩

Collections

BRGM BRGM-DO
73 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More