Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France)
International audience The first analytical results relative to the native geothermal brine discharged from the two deep wells drilled at Vendenheim, in the Rhine Graben, in Alsace (France), obtained within the framework of the Vendenheim FONROCHE geothermal project and the H2020 European DEEP-EGS p...
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ftccsdartic:oai:HAL:hal-03022957v1 2023-05-15T16:52:51+02:00 Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France): Oral presentation Sanjuan, Bernard, Negrel, Gabrielle Le Lous, Morgan Poulmarch, Ewan Gal, Frédérick Damy, Pierre-Clément Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) Compagnie Française de Géothermie (CFG) Fonroche Géothermie ISOR Reykjavik, Iceland 2020-04-24 https://hal-brgm.archives-ouvertes.fr/hal-03022957 en eng HAL CCSD hal-03022957 https://hal-brgm.archives-ouvertes.fr/hal-03022957 Final Meeting Webcast DEEPEGS (Deployment of Deep Enhanced Geothermal Systems for Sustainable Energy Business) https://hal-brgm.archives-ouvertes.fr/hal-03022957 Final Meeting Webcast DEEPEGS (Deployment of Deep Enhanced Geothermal Systems for Sustainable Energy Business), ISOR, Apr 2020, Reykjavik, Iceland geochemical data brine Vendenheim Rhine Graben water circulation temperature geothermometers geothermal well [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/conferenceObject Conference papers 2020 ftccsdartic 2021-11-07T00:34:05Z International audience The first analytical results relative to the native geothermal brine discharged from the two deep wells drilled at Vendenheim, in the Rhine Graben, in Alsace (France), obtained within the framework of the Vendenheim FONROCHE geothermal project and the H2020 European DEEP-EGS project, suggest the geochemical composition of this brine is very similar to that of the fluid which was discharged from the neighboring Cronenbourg deep well, in the past. It is also close to that of the brines discharged from the other deep wells located in more northern areas of the Rhine Graben, such as Soultz-sous-Forêts, Rittershoffen, in France, and Landau, Insheim, in Germany. This Na-Cl brine has a TDS value around 100 g/l and a pH value close to 5, before cooling and degassing. Except for the calcium and strontium concentration values, which are much lower than those in the Soultz-sous-Forêts, Rittershoffen, Landau and Insheim brines, the other concentration values of major and trace species are comparable. Given the similarity of the geochemical composition of all these waters, their origin is probably similar but also multiple, because it results from processes of mixing between primary brines formed by advanced evaporation of seawater (probably until the stage of halite precipitation) and meteoric freshwaters, plus contributions from halite dissolution following successive marine transgression-regression cycles from the Triassic to Oligocene. As for the other deep brines, the main solute cation geothermometers give estimations of reservoir temperature close to 225 ± 25°C for the Vendenheim native brine. This estimation probably corresponds to the temperature of equilibrium at which this brine acquires its chemical composition by interaction with the reservoir rocks. The mineralogical assemblage in equilibrium with the brine at this temperature was described in previous studies. The concordant estimations of reservoir temperature, using thermometric relationships such Na-Li and Mg/Li, especially ... Conference Object Iceland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
geochemical data brine Vendenheim Rhine Graben water circulation temperature geothermometers geothermal well [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
geochemical data brine Vendenheim Rhine Graben water circulation temperature geothermometers geothermal well [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Sanjuan, Bernard, Negrel, Gabrielle Le Lous, Morgan Poulmarch, Ewan Gal, Frédérick Damy, Pierre-Clément Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) |
topic_facet |
geochemical data brine Vendenheim Rhine Graben water circulation temperature geothermometers geothermal well [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience The first analytical results relative to the native geothermal brine discharged from the two deep wells drilled at Vendenheim, in the Rhine Graben, in Alsace (France), obtained within the framework of the Vendenheim FONROCHE geothermal project and the H2020 European DEEP-EGS project, suggest the geochemical composition of this brine is very similar to that of the fluid which was discharged from the neighboring Cronenbourg deep well, in the past. It is also close to that of the brines discharged from the other deep wells located in more northern areas of the Rhine Graben, such as Soultz-sous-Forêts, Rittershoffen, in France, and Landau, Insheim, in Germany. This Na-Cl brine has a TDS value around 100 g/l and a pH value close to 5, before cooling and degassing. Except for the calcium and strontium concentration values, which are much lower than those in the Soultz-sous-Forêts, Rittershoffen, Landau and Insheim brines, the other concentration values of major and trace species are comparable. Given the similarity of the geochemical composition of all these waters, their origin is probably similar but also multiple, because it results from processes of mixing between primary brines formed by advanced evaporation of seawater (probably until the stage of halite precipitation) and meteoric freshwaters, plus contributions from halite dissolution following successive marine transgression-regression cycles from the Triassic to Oligocene. As for the other deep brines, the main solute cation geothermometers give estimations of reservoir temperature close to 225 ± 25°C for the Vendenheim native brine. This estimation probably corresponds to the temperature of equilibrium at which this brine acquires its chemical composition by interaction with the reservoir rocks. The mineralogical assemblage in equilibrium with the brine at this temperature was described in previous studies. The concordant estimations of reservoir temperature, using thermometric relationships such Na-Li and Mg/Li, especially ... |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) Compagnie Française de Géothermie (CFG) Fonroche Géothermie ISOR |
format |
Conference Object |
author |
Sanjuan, Bernard, Negrel, Gabrielle Le Lous, Morgan Poulmarch, Ewan Gal, Frédérick Damy, Pierre-Clément |
author_facet |
Sanjuan, Bernard, Negrel, Gabrielle Le Lous, Morgan Poulmarch, Ewan Gal, Frédérick Damy, Pierre-Clément |
author_sort |
Sanjuan, Bernard, |
title |
Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) |
title_short |
Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) |
title_full |
Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) |
title_fullStr |
Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) |
title_full_unstemmed |
Main geochemical characteristics of the deep geothermal brine at Vendenheim (Alsace, France) |
title_sort |
main geochemical characteristics of the deep geothermal brine at vendenheim (alsace, france) |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal-brgm.archives-ouvertes.fr/hal-03022957 |
op_coverage |
Reykjavik, Iceland |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Final Meeting Webcast DEEPEGS (Deployment of Deep Enhanced Geothermal Systems for Sustainable Energy Business) https://hal-brgm.archives-ouvertes.fr/hal-03022957 Final Meeting Webcast DEEPEGS (Deployment of Deep Enhanced Geothermal Systems for Sustainable Energy Business), ISOR, Apr 2020, Reykjavik, Iceland |
op_relation |
hal-03022957 https://hal-brgm.archives-ouvertes.fr/hal-03022957 |
_version_ |
1766043315546882048 |