On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems

© 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Detalles Bibliográficos
Autores: Kivi, Iman Rahimzadeh, Vilarrasa, Víctor, Kim, Kwang Il, Yoo, Hwajung, Min, Ki-Bok
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/348270
Acceso en línea:http://hdl.handle.net/10261/348270
Access Level:acceso abierto
Palabra clave:Coupled hydromechanical processes
Enhanced geothermal systems
Induced seismicity
Triggering mechanisms
Reservoir stimulation
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title On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
spellingShingle On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
Kivi, Iman Rahimzadeh
Coupled hydromechanical processes
Enhanced geothermal systems
Induced seismicity
Triggering mechanisms
Reservoir stimulation
title_short On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
title_full On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
title_fullStr On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
title_full_unstemmed On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
title_sort On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems
author Kivi, Iman Rahimzadeh
author_facet Kivi, Iman Rahimzadeh
Vilarrasa, Víctor
Kim, Kwang Il
Yoo, Hwajung
Min, Ki-Bok
author_role author
author2 Vilarrasa, Víctor
Kim, Kwang Il
Yoo, Hwajung
Min, Ki-Bok
author2_role author
author
author
author
topic Coupled hydromechanical processes
Enhanced geothermal systems
Induced seismicity
Triggering mechanisms
Reservoir stimulation
topic_facet Coupled hydromechanical processes
Enhanced geothermal systems
Induced seismicity
Triggering mechanisms
Reservoir stimulation
description © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
publishDate 2024
format article
status_str publishedVersion
url http://hdl.handle.net/10261/348270
eu_rights_str_mv openAccess
publisher Elsevier
institution Consejo Superior de Investigaciones Científicas (CSIC)
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
spelling On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems Kivi, Iman Rahimzadeh Vilarrasa, Víctor Kim, Kwang Il Yoo, Hwajung Min, Ki-Bok Coupled hydromechanical processes Enhanced geothermal systems Induced seismicity Triggering mechanisms Reservoir stimulation © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Injection-induced seismicity has become one of the most critical challenges for the widespread deployment of Enhanced Geothermal Systems (EGS). In particular, some EGS development projects have led to large, damaging earthquakes that unexpectedly occurred far off the stimulated reservoir region and, in particular, after stopping fluid injection. Yet, the causative mechanisms of these seismicity patterns remain highly elusive. Here, we identify a combination of mechanisms that could explain delayed seismicity in EGS sites by conducting fully-coupled hydromechanical simulations of the hydraulic stimulation of a naturally-fractured granitic reservoir. The model comprises a sparse network of long, variably-oriented fractures interacting with a nearby, critically-oriented fault. The results show that the presence of fractures introduces notable nonlinearities in the flow field and rock deformation and significantly expands the rock volume affected by fluid injection. First, the stimulated fracture network provides highly-permeable conduits for communicating elevated pore pressure over long distances. Second, the anisotropic expansion of fractures generates shear stress that is transmitted almost instantaneously across the reservoir. The pore pressure and stress perturbations can not only cause slip along fractures, inducing (micro)seismicity during injection, but also affect the stability of nearby faults, which may not necessarily be pressurized during injection. The transferred poroelastic stresses can increase or decrease the slip tendency along different fault segments. However, the fault may reactivate only after several months following injection when a progressive pore pressure diffusion modulated by the transient fault permeability evolution brings a critically-stressed fault segment to failure conditions. We also find that the spatiotemporal evolution of seismicity depends largely on the nearby fault orientation, hydromechanical properties, and hydraulic connection with the fracture network, as well as the initial state of stress. We conclude that accurate subsurface characterization and continuous monitoring during and after injection should allow for managing the risks posed by injection-induced seismicity and safely unlocking the immense potential for clean and sustainable geothermal energy. I.R.K. and V.V. acknowledge support by the PCI2021-122077-2B project (http://www.easygeocarbon.com) funded by MCIN/AEI/10.13039/501100011033 and the European Union NextGenerationEU/PRTR. I.R.K. also acknowledges funding from the Engineering and Physical Sciences Research Council through the UKRI Postdoc Guarantee Award THMC4CCS [Grant number EP/X026019/1]. V.V. also acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Program through the Starting Grant GEoREST (http://www.georest.eu) under Grant agreement No. 801809. IDAEA-CSIC is a Centre of Excellence Severo Ochoa (Spanish Ministry of Science and Innovation, Grant CEX2018-000794-S funded by MCIN/AEI/10.13039/501100011033). IMEDEA is an accredited "Maria de Maeztu Excellence Unit" (Grant CEX2021-001198, funded by MCIN/AEI/10.13039/501100011033). K.I.K. acknowledges support by the Innovative Technology Development Program for High-level waste management of the National Research Foundation of Korea (NRF) funded by the Korea government (Ministry of Science and ICT, MSIT) (Grant No.2021M2E3A2041312). K.-B.M. and H.Y. were supported by a grant from the Human Resources Development program (No. 20204010600250) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), funded by the Ministry of Trade, Industry, and Energy of the Korean Government. K.-B.M. and H.Y. were also supported by the Innovative Technology Development Program for High-level waste management of the National Research Foundation of Korea (NRF) funded by the Korea government (Ministry of Science and ICT, MSIT) (Grant No. 2021M2E3A2044264). With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2018-000794-S). With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001198-S). Peer reviewed Elsevier http://hdl.handle.net/10261/348270
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publishDateSort 2024
author_browse Kim, Kwang Il
Kivi, Iman Rahimzadeh
Min, Ki-Bok
Vilarrasa, Víctor
Yoo, Hwajung
publisherStr Elsevier
score 6,924472

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