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dc.contributor.author
Kittilä, Anniina
dc.contributor.author
Jalali, Mohammadreza
dc.contributor.author
Saar, Martin O.
dc.contributor.author
Kong, Xiang-Zhao
dc.date.accessioned
2020-06-17T12:05:35Z
dc.date.available
2020-06-13T05:35:29Z
dc.date.available
2020-06-16T08:53:40Z
dc.date.available
2020-06-17T12:03:30Z
dc.date.available
2020-06-17T12:05:35Z
dc.date.issued
2020
dc.identifier.issn
2195-9706
dc.identifier.other
10.1186/s40517-020-00172-x
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/420224
dc.identifier.doi
10.3929/ethz-b-000420224
dc.description.abstract
When water is injected into a fracture-dominated reservoir that is cooler or hotter than the injected water, the reservoir permeability is expected to be altered by the injection-induced thermo-mechanical effects, resulting in the redistribution of fluid flow in the reservoir. These effects are important to be taken into account when evaluating the performance and lifetime particularly of Enhanced Geothermal Systems (EGS). In this paper, we compare the results from two dye tracer tests, conducted before (at ambient temperature of 13∘C) and during the injection of 45∘C hot water into a fractured crystalline rock at the Grimsel Test Site in Switzerland. Conducting a moment analysis on the recovered tracer residence time distribution (RTD) curves, we observe, after hot water injection, a significant decrease in the total tracer recovery. This recovery decrease strongly suggests that fluid flow was redistributed in the studied rock volume and that the majority of the injected water was lost to the far-field. Furthermore, using temperature measurements, obtained from the same locations as the tracer RTD curves, we conceptualize an approach to estimate the fracture surface area contributing to the heat exchange between the host rock and the circulating fluid. Our moment analysis and simplified estimation of fracture surface area provide insights into the hydraulic properties of the hydraulically active fracture system and the changes in fluid flow. Such insights are important to assess the heat exchange performance of a geothermal formation during fluid circulation and to estimate the lifetime of the geothermal formation, particularly in EGS.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Springer
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Geothermal energy
en_US
dc.subject
Tracer test
en_US
dc.subject
Moment analysis
en_US
dc.subject
Hot water injection
en_US
dc.subject
Hydraulic Stimulation
en_US
dc.subject
Crystalline rock
en_US
dc.subject
Fractured reservoirs
en_US
dc.title
Solute tracer test quantification of the effects of hot water injection into hydraulically stimulated crystalline rock
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2020-06-05
ethz.journal.title
Geothermal Energy
ethz.journal.volume
8
en_US
ethz.journal.issue
1
en_US
ethz.pages.start
17
en_US
ethz.size
21 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Heidelberg
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02282 - SCCER-SoE / SCCER-SoE
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02506 - Institut für Geophysik / Institute of Geophysics::09494 - Saar, Martin O. / Saar, Martin O.
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02506 - Institut für Geophysik / Institute of Geophysics::09494 - Saar, Martin O. / Saar, Martin O.
ethz.tag
Grimsel ISC
en_US
ethz.relation.isSupplementedBy
10.3929/ethz-b-000348073
ethz.date.deposited
2020-06-13T05:35:33Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-06-16T08:53:52Z
ethz.rosetta.lastUpdated
2021-02-15T14:44:31Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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