Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings
International audience Our study investigates the genesis of granitic reservoirs formed within a brittle shear zone in central Finland, evaluating their feasibility as deep geothermal targets. We employ a suite of laboratory-based experiments and cutting-edge analytical mineral techniques to determi...
Published in: | Geothermics |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-04400378 https://hal.science/hal-04400378/document https://hal.science/hal-04400378/file/1-s2.0-S0375650523002493-main.pdf https://doi.org/10.1016/j.geothermics.2023.102895 |
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ftccsdartic:oai:HAL:hal-04400378v1 2024-02-11T10:03:47+01:00 Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings Bischoff, Alan Heap, Michael Mikkola, Perttu Kuva, Jukka Reuschlé, Thierry Jolis, Ester Engström, Jon Reijonen, Heini Leskelä, Tuomas Geological Survey of Finland = Geologian tutkimuskeskus tuottaa (GKT) Institut Terre Environnement Strasbourg (ITES) École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ANR-19-CE05-0043,GERESFAULT,Ressources géothermales des zones faillées d'échelle crustale : exploration de nouveaux systèmes pour une géothermie compétitive(2019) ANR-10-IDEX-0002,UNISTRA,Par-delà les frontières, l'Université de Strasbourg(2010) ANR-20-SFRI-0012,STRAT'US,Façonner les talents en formation et en recherche à l'Université de Strasbourg(2020) 2024 https://hal.science/hal-04400378 https://hal.science/hal-04400378/document https://hal.science/hal-04400378/file/1-s2.0-S0375650523002493-main.pdf https://doi.org/10.1016/j.geothermics.2023.102895 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geothermics.2023.102895 hal-04400378 https://hal.science/hal-04400378 https://hal.science/hal-04400378/document https://hal.science/hal-04400378/file/1-s2.0-S0375650523002493-main.pdf doi:10.1016/j.geothermics.2023.102895 info:eu-repo/semantics/OpenAccess ISSN: 0375-6505 Geothermics https://hal.science/hal-04400378 Geothermics, 2024, 118, pp.102895. ⟨10.1016/j.geothermics.2023.102895⟩ Cataclasis Fennoscandian Shield Geothermal reservoirs Shear zones Hydrothermal alteration Crystalline settings [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology info:eu-repo/semantics/article Journal articles 2024 ftccsdartic https://doi.org/10.1016/j.geothermics.2023.102895 2024-01-20T23:37:32Z International audience Our study investigates the genesis of granitic reservoirs formed within a brittle shear zone in central Finland, evaluating their feasibility as deep geothermal targets. We employ a suite of laboratory-based experiments and cutting-edge analytical mineral techniques to determine the petrophysical and thermal properties of targeted granitic rocks, elucidating their formation processes. The most favorable reservoir properties were observed in granites affected by cataclasis and mineral dissolution, leading to a notable secondary porosity of ∼20 %. Reservoir quality is largely controlled by the pore network morphology. Alongside fractures, interconnected moldic, sieve, and interparticle pores contribute to substantial permeability of ∼5 × 10−14 m2 (50mD), even under high confining pressures of 50MPa (∼2km). A new geothermal play is here presented: brittle shear zones that have undergone high-temperature (∼200–300 °C) hydrothermal alteration. These findings will significantly enhance our capacity to identify and exploit prolific permeable zones in deep crystalline settings globally, thereby making a substantial contribution to our ongoing transition to cleaner energy resources. Article in Journal/Newspaper Fennoscandian Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Geothermics 118 102895 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Cataclasis Fennoscandian Shield Geothermal reservoirs Shear zones Hydrothermal alteration Crystalline settings [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology |
spellingShingle |
Cataclasis Fennoscandian Shield Geothermal reservoirs Shear zones Hydrothermal alteration Crystalline settings [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology Bischoff, Alan Heap, Michael Mikkola, Perttu Kuva, Jukka Reuschlé, Thierry Jolis, Ester Engström, Jon Reijonen, Heini Leskelä, Tuomas Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
topic_facet |
Cataclasis Fennoscandian Shield Geothermal reservoirs Shear zones Hydrothermal alteration Crystalline settings [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology |
description |
International audience Our study investigates the genesis of granitic reservoirs formed within a brittle shear zone in central Finland, evaluating their feasibility as deep geothermal targets. We employ a suite of laboratory-based experiments and cutting-edge analytical mineral techniques to determine the petrophysical and thermal properties of targeted granitic rocks, elucidating their formation processes. The most favorable reservoir properties were observed in granites affected by cataclasis and mineral dissolution, leading to a notable secondary porosity of ∼20 %. Reservoir quality is largely controlled by the pore network morphology. Alongside fractures, interconnected moldic, sieve, and interparticle pores contribute to substantial permeability of ∼5 × 10−14 m2 (50mD), even under high confining pressures of 50MPa (∼2km). A new geothermal play is here presented: brittle shear zones that have undergone high-temperature (∼200–300 °C) hydrothermal alteration. These findings will significantly enhance our capacity to identify and exploit prolific permeable zones in deep crystalline settings globally, thereby making a substantial contribution to our ongoing transition to cleaner energy resources. |
author2 |
Geological Survey of Finland = Geologian tutkimuskeskus tuottaa (GKT) Institut Terre Environnement Strasbourg (ITES) École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ANR-19-CE05-0043,GERESFAULT,Ressources géothermales des zones faillées d'échelle crustale : exploration de nouveaux systèmes pour une géothermie compétitive(2019) ANR-10-IDEX-0002,UNISTRA,Par-delà les frontières, l'Université de Strasbourg(2010) ANR-20-SFRI-0012,STRAT'US,Façonner les talents en formation et en recherche à l'Université de Strasbourg(2020) |
format |
Article in Journal/Newspaper |
author |
Bischoff, Alan Heap, Michael Mikkola, Perttu Kuva, Jukka Reuschlé, Thierry Jolis, Ester Engström, Jon Reijonen, Heini Leskelä, Tuomas |
author_facet |
Bischoff, Alan Heap, Michael Mikkola, Perttu Kuva, Jukka Reuschlé, Thierry Jolis, Ester Engström, Jon Reijonen, Heini Leskelä, Tuomas |
author_sort |
Bischoff, Alan |
title |
Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
title_short |
Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
title_full |
Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
title_fullStr |
Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
title_full_unstemmed |
Hydrothermally altered shear zones: A new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
title_sort |
hydrothermally altered shear zones: a new reservoir play for the expansion of deep geothermal exploration in crystalline settings |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04400378 https://hal.science/hal-04400378/document https://hal.science/hal-04400378/file/1-s2.0-S0375650523002493-main.pdf https://doi.org/10.1016/j.geothermics.2023.102895 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
ISSN: 0375-6505 Geothermics https://hal.science/hal-04400378 Geothermics, 2024, 118, pp.102895. ⟨10.1016/j.geothermics.2023.102895⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geothermics.2023.102895 hal-04400378 https://hal.science/hal-04400378 https://hal.science/hal-04400378/document https://hal.science/hal-04400378/file/1-s2.0-S0375650523002493-main.pdf doi:10.1016/j.geothermics.2023.102895 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.geothermics.2023.102895 |
container_title |
Geothermics |
container_volume |
118 |
container_start_page |
102895 |
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1790600112688332800 |