Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)

The long-term sustainability of fractures within rocks determines whether it is reasonable to utilize such formations as potential EGS reservoirs. Representative for reservoirs in Variscan metamorphic rocks, three long-term (one month each) fracture permeability experiments on saw-cut slate core sam...

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Autores principales:	Chaojie Cheng, Johannes Herrmann, Bianca Wagner, Bernd Leiss, Jessica A. Stammeier, Erik Rybacki, Harald Milsch
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fracture permeability fluid–rock interactions slate temperature time-dependent Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/cbc2f46b4cf64818bbfcbcfc374f0fd0
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spelling	oai:doaj.org-article:cbc2f46b4cf64818bbfcbcfc374f0fd02021-11-25T17:42:46ZLong-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)10.3390/geosciences111104432076-3263https://doaj.org/article/cbc2f46b4cf64818bbfcbcfc374f0fd02021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3263/11/11/443https://doaj.org/toc/2076-3263The long-term sustainability of fractures within rocks determines whether it is reasonable to utilize such formations as potential EGS reservoirs. Representative for reservoirs in Variscan metamorphic rocks, three long-term (one month each) fracture permeability experiments on saw-cut slate core samples from the Hahnenklee well (Harz Mountains, Germany) were performed. The purpose was to investigate fracture permeability evolution at temperatures up to 90 °C using both deionized water (DI) and a 0.5 M NaCl solution as the pore fluid. Flow with DI resulted in a fracture permeability decline that is more pronounced at 90 °C, but permeability slightly increased with the NaCl fluid. Microstructural observations and analyses of the effluent composition suggest that fracture permeability evolution is governed by an interplay of free-face dissolution and pressure solution. It is concluded that newly introduced fractures may be subject to a certain permeability reduction due to pressure solution that is unlikely to be mitigated. However, long-term fracture permeability may be sustainable or even increase by free-face dissolution when the injection fluid possesses a certain (NaCl) salinity.Chaojie ChengJohannes HerrmannBianca WagnerBernd LeissJessica A. StammeierErik RybackiHarald MilschMDPI AGarticlefracturepermeabilityfluid–rock interactionsslatetemperaturetime-dependentGeologyQE1-996.5ENGeosciences, Vol 11, Iss 443, p 443 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fracture permeability fluid–rock interactions slate temperature time-dependent Geology QE1-996.5
spellingShingle	fracture permeability fluid–rock interactions slate temperature time-dependent Geology QE1-996.5 Chaojie Cheng Johannes Herrmann Bianca Wagner Bernd Leiss Jessica A. Stammeier Erik Rybacki Harald Milsch Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)
description	The long-term sustainability of fractures within rocks determines whether it is reasonable to utilize such formations as potential EGS reservoirs. Representative for reservoirs in Variscan metamorphic rocks, three long-term (one month each) fracture permeability experiments on saw-cut slate core samples from the Hahnenklee well (Harz Mountains, Germany) were performed. The purpose was to investigate fracture permeability evolution at temperatures up to 90 °C using both deionized water (DI) and a 0.5 M NaCl solution as the pore fluid. Flow with DI resulted in a fracture permeability decline that is more pronounced at 90 °C, but permeability slightly increased with the NaCl fluid. Microstructural observations and analyses of the effluent composition suggest that fracture permeability evolution is governed by an interplay of free-face dissolution and pressure solution. It is concluded that newly introduced fractures may be subject to a certain permeability reduction due to pressure solution that is unlikely to be mitigated. However, long-term fracture permeability may be sustainable or even increase by free-face dissolution when the injection fluid possesses a certain (NaCl) salinity.
format	article
author	Chaojie Cheng Johannes Herrmann Bianca Wagner Bernd Leiss Jessica A. Stammeier Erik Rybacki Harald Milsch
author_facet	Chaojie Cheng Johannes Herrmann Bianca Wagner Bernd Leiss Jessica A. Stammeier Erik Rybacki Harald Milsch
author_sort	Chaojie Cheng
title	Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)
title_short	Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)
title_full	Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)
title_fullStr	Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)
title_full_unstemmed	Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)
title_sort	long-term evolution of fracture permeability in slate: an experimental study with implications for enhanced geothermal systems (egs)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cbc2f46b4cf64818bbfcbcfc374f0fd0
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Long-Term Evolution of Fracture Permeability in Slate: An Experimental Study with Implications for Enhanced Geothermal Systems (EGS)

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