Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer
CO2 injection in extensive saline aquifers that present no faults is unlikely to damage the caprock sealing capacity. In contrast, CO2 injection in closed reservoirs will induce a large pressure buildup that may reactivate the low-permeable faults that bound the reservoir. However, the vast majority of CO2 storage formations will be extensive saline aquifers bounded by a limited number of low-permeable faults. Such storage formations have received little attention and are the focus of this study. We model an extensive aquifer bounded by a heterogeneous low-permeable fault on one side and having open boundaries on the other sides. Simulation results show that the storage formation pressurizes between the injection well and the low-permeable fault, causing total stress changes and effective stress reduction around the fault. These changes lead to yielding of the fault core that is next to the lower half of the storage formation when injecting in the hanging wall. The yield of the fault core would induce a sequence of microseismic events with accumulated seismic moment equivalent to an earthquake of magnitude 1.7, which would not be felt on the ground surface and would not enhance permeability of the ductile clay-rich fault. © 2017 The Authors.
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Elsevier
2017
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Subjects: | Geomechanics, Hydro-mechanical coupling, Induced seismicity, Overpressure, |
Online Access: | http://hdl.handle.net/10261/156430 http://dx.doi.org/10.13039/501100000780 |
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dig-idaea-es-10261-1564302020-05-25T16:39:23Z Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer Vilarrasa, Víctor Makhnenko, Roman Y. Laloui, Lyesse European Commission Geomechanics Hydro-mechanical coupling Induced seismicity Overpressure CO2 injection in extensive saline aquifers that present no faults is unlikely to damage the caprock sealing capacity. In contrast, CO2 injection in closed reservoirs will induce a large pressure buildup that may reactivate the low-permeable faults that bound the reservoir. However, the vast majority of CO2 storage formations will be extensive saline aquifers bounded by a limited number of low-permeable faults. Such storage formations have received little attention and are the focus of this study. We model an extensive aquifer bounded by a heterogeneous low-permeable fault on one side and having open boundaries on the other sides. Simulation results show that the storage formation pressurizes between the injection well and the low-permeable fault, causing total stress changes and effective stress reduction around the fault. These changes lead to yielding of the fault core that is next to the lower half of the storage formation when injecting in the hanging wall. The yield of the fault core would induce a sequence of microseismic events with accumulated seismic moment equivalent to an earthquake of magnitude 1.7, which would not be felt on the ground surface and would not enhance permeability of the ductile clay-rich fault. © 2017 The Authors. V.V. acknowledges support from the ‘EPFL Fellows’ fellowship programme co-funded by Marie Curie, FP7 Grant agreement no. 291771. R.M. activities are sponsored by SCCER-SoE (Switzerland) grant KTI.2013.288 and Swiss Federal Office of Energy (SFOE) project CAPROCK #810008154. Peer reviewed 2017-10-19T07:06:21Z 2017-10-19T07:06:21Z 2017 comunicación de congreso http://purl.org/coar/resource_type/c_5794 Energy Procedia 114: 3282-3290 (2017) http://hdl.handle.net/10261/156430 10.1016/j.egypro.2017.03.1460 http://dx.doi.org/10.13039/501100000780 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/291771 Publisher's version 10.1016/j.egypro.2017.03.1460 Sí open Elsevier |
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Geomechanics Hydro-mechanical coupling Induced seismicity Overpressure Geomechanics Hydro-mechanical coupling Induced seismicity Overpressure Vilarrasa, Víctor Makhnenko, Roman Y. Laloui, Lyesse Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer |
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CO2 injection in extensive saline aquifers that present no faults is unlikely to damage the caprock sealing capacity. In contrast, CO2 injection in closed reservoirs will induce a large pressure buildup that may reactivate the low-permeable faults that bound the reservoir. However, the vast majority of CO2 storage formations will be extensive saline aquifers bounded by a limited number of low-permeable faults. Such storage formations have received little attention and are the focus of this study. We model an extensive aquifer bounded by a heterogeneous low-permeable fault on one side and having open boundaries on the other sides. Simulation results show that the storage formation pressurizes between the injection well and the low-permeable fault, causing total stress changes and effective stress reduction around the fault. These changes lead to yielding of the fault core that is next to the lower half of the storage formation when injecting in the hanging wall. The yield of the fault core would induce a sequence of microseismic events with accumulated seismic moment equivalent to an earthquake of magnitude 1.7, which would not be felt on the ground surface and would not enhance permeability of the ductile clay-rich fault. © 2017 The Authors. |
author2 |
European Commission |
author_facet |
European Commission Vilarrasa, Víctor Makhnenko, Roman Y. Laloui, Lyesse |
format |
comunicación de congreso |
topic_facet |
Geomechanics Hydro-mechanical coupling Induced seismicity Overpressure |
author |
Vilarrasa, Víctor Makhnenko, Roman Y. Laloui, Lyesse |
author_sort |
Vilarrasa, Víctor |
title |
Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer |
title_short |
Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer |
title_full |
Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer |
title_fullStr |
Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer |
title_full_unstemmed |
Potential for Fault Reactivation Due to CO2 Injection in a Semi-Closed Saline Aquifer |
title_sort |
potential for fault reactivation due to co2 injection in a semi-closed saline aquifer |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://hdl.handle.net/10261/156430 http://dx.doi.org/10.13039/501100000780 |
work_keys_str_mv |
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_version_ |
1777669292584599552 |