Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain

Fracture connectivity within fractured granitic basement geothermal reservoirs is an important factor controlling their permeability. This study aims to improve the understanding of fluid–rock interaction processes at low to moderate regional strain. The Noble Hills range (Death Valley, CA, USA) was...

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Autores principales:	Johanne Klee, Arezki Chabani, Béatrice A. Ledésert, Sébastien Potel, Ronan L. Hébert, Ghislain Trullenque
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fracturing processes fluid circulation granite alteration low to moderate regional strain geothermal reservoir Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/aa71f8e58aa749ba9243796aa47a0f9f
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spelling	oai:doaj.org-article:aa71f8e58aa749ba9243796aa47a0f9f2021-11-25T17:42:38ZFluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain10.3390/geosciences111104332076-3263https://doaj.org/article/aa71f8e58aa749ba9243796aa47a0f9f2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3263/11/11/433https://doaj.org/toc/2076-3263Fracture connectivity within fractured granitic basement geothermal reservoirs is an important factor controlling their permeability. This study aims to improve the understanding of fluid–rock interaction processes at low to moderate regional strain. The Noble Hills range (Death Valley, CA, USA) was chosen as a naturally exhumed paleo geothermal reservoir. A series of petrographic, petrophysical, and geochemical investigations, combined with a fracture distribution analysis, were carried out on samples collected across fracture zones. Our results indicate that several generations of fluids have percolated through the reservoir. An increase of (1) the alteration degree; (2) the porosity values; and (3) the calcite content was observed when approaching fracture zones. No correlation was identified among the alteration degree, the porosity, or the calcite content. At a local scale, samples showed that the degree of alteration does not necessarily depend on the fracture density or on the amount of the strain. It is concluded that the combined influence of strain and coeval fluid–rock interaction processes drastically influence the petrophysical properties of fracture zones, which in turn impact geothermal production potential.Johanne KleeArezki ChabaniBéatrice A. LedésertSébastien PotelRonan L. HébertGhislain TrullenqueMDPI AGarticlefracturing processesfluid circulationgranite alterationlow to moderate regional straingeothermal reservoirGeologyQE1-996.5ENGeosciences, Vol 11, Iss 433, p 433 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fracturing processes fluid circulation granite alteration low to moderate regional strain geothermal reservoir Geology QE1-996.5
spellingShingle	fracturing processes fluid circulation granite alteration low to moderate regional strain geothermal reservoir Geology QE1-996.5 Johanne Klee Arezki Chabani Béatrice A. Ledésert Sébastien Potel Ronan L. Hébert Ghislain Trullenque Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain
description	Fracture connectivity within fractured granitic basement geothermal reservoirs is an important factor controlling their permeability. This study aims to improve the understanding of fluid–rock interaction processes at low to moderate regional strain. The Noble Hills range (Death Valley, CA, USA) was chosen as a naturally exhumed paleo geothermal reservoir. A series of petrographic, petrophysical, and geochemical investigations, combined with a fracture distribution analysis, were carried out on samples collected across fracture zones. Our results indicate that several generations of fluids have percolated through the reservoir. An increase of (1) the alteration degree; (2) the porosity values; and (3) the calcite content was observed when approaching fracture zones. No correlation was identified among the alteration degree, the porosity, or the calcite content. At a local scale, samples showed that the degree of alteration does not necessarily depend on the fracture density or on the amount of the strain. It is concluded that the combined influence of strain and coeval fluid–rock interaction processes drastically influence the petrophysical properties of fracture zones, which in turn impact geothermal production potential.
format	article
author	Johanne Klee Arezki Chabani Béatrice A. Ledésert Sébastien Potel Ronan L. Hébert Ghislain Trullenque
author_facet	Johanne Klee Arezki Chabani Béatrice A. Ledésert Sébastien Potel Ronan L. Hébert Ghislain Trullenque
author_sort	Johanne Klee
title	Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain
title_short	Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain
title_full	Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain
title_fullStr	Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain
title_full_unstemmed	Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain
title_sort	fluid-rock interactions in a paleo-geothermal reservoir (noble hills granite, california, usa). part 2: the influence of fracturing on granite alteration processes and fluid circulation at low to moderate regional strain
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/aa71f8e58aa749ba9243796aa47a0f9f
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Fluid-Rock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain

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