Frictional Properties and Seismogenic Potential of Caprock Shales
Fractures and faults are critical elements affecting the geomechanical integrity of CO 2 storage sites. In particular, the slip of fractures and faults may affect reservoir integrity and increase potential for breach, may be monitored via the resulting seismicity. This paper presents an experimental...
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ftrepec:oai:RePEc:gam:jeners:v:13:y:2020:i:23:p:6275-:d:452748 2024-04-14T08:20:17+00:00 Frictional Properties and Seismogenic Potential of Caprock Shales Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin https://www.mdpi.com/1996-1073/13/23/6275/pdf https://www.mdpi.com/1996-1073/13/23/6275/ unknown https://www.mdpi.com/1996-1073/13/23/6275/pdf https://www.mdpi.com/1996-1073/13/23/6275/ article ftrepec 2024-03-19T10:37:53Z Fractures and faults are critical elements affecting the geomechanical integrity of CO 2 storage sites. In particular, the slip of fractures and faults may affect reservoir integrity and increase potential for breach, may be monitored via the resulting seismicity. This paper presents an experimental study on shale samples from Draupne and Rurikfjellet formations from the North Sea and Svalbard, Norway, using a laboratory test procedure simulating the slip of fractures and faults under realistic stress conditions for North Sea CO 2 storage sites. The motivation of the study is to investigate whether the slip along the fractures within these shales may cause detectable seismic events, based on a slip stability criterion. Using a direct shear apparatus, frictional properties of the fractures were measured during shearing, as a function of the shear velocity and applied stress normal to the fracture. We calculated the friction coefficient of the fractures during the different stages of the shear tests and analysed its dependency on shear velocity. Information on velocity-dependent friction coefficient and its evolution with increasing slip were then used to assess whether slip was stable (velocity-strengthening) or unstable (velocity-weakening). Results showed that friction coefficient for both Draupne and Rurikfjellet shales increased when the shear velocity was increased from 10 to 50 µm/s, indicating a velocity-strengthening behaviour. Such a behaviour implies that slip on fractures and faults within these formations may be less prone to producing detectable seismicity during a slip event. These results will have implications for the type of techniques to be used for monitoring reservoir and caprock integrity, for instance, for CO 2 storage sites. direct shear; velocity-stepping; friction; shale; CO 2 storage; seismicity Article in Journal/Newspaper Svalbard RePEc (Research Papers in Economics) Svalbard Norway Rurikfjellet ENVELOPE(18.217,18.217,77.983,77.983) |
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Open Polar |
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RePEc (Research Papers in Economics) |
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language |
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description |
Fractures and faults are critical elements affecting the geomechanical integrity of CO 2 storage sites. In particular, the slip of fractures and faults may affect reservoir integrity and increase potential for breach, may be monitored via the resulting seismicity. This paper presents an experimental study on shale samples from Draupne and Rurikfjellet formations from the North Sea and Svalbard, Norway, using a laboratory test procedure simulating the slip of fractures and faults under realistic stress conditions for North Sea CO 2 storage sites. The motivation of the study is to investigate whether the slip along the fractures within these shales may cause detectable seismic events, based on a slip stability criterion. Using a direct shear apparatus, frictional properties of the fractures were measured during shearing, as a function of the shear velocity and applied stress normal to the fracture. We calculated the friction coefficient of the fractures during the different stages of the shear tests and analysed its dependency on shear velocity. Information on velocity-dependent friction coefficient and its evolution with increasing slip were then used to assess whether slip was stable (velocity-strengthening) or unstable (velocity-weakening). Results showed that friction coefficient for both Draupne and Rurikfjellet shales increased when the shear velocity was increased from 10 to 50 µm/s, indicating a velocity-strengthening behaviour. Such a behaviour implies that slip on fractures and faults within these formations may be less prone to producing detectable seismicity during a slip event. These results will have implications for the type of techniques to be used for monitoring reservoir and caprock integrity, for instance, for CO 2 storage sites. direct shear; velocity-stepping; friction; shale; CO 2 storage; seismicity |
format |
Article in Journal/Newspaper |
author |
Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin |
spellingShingle |
Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin Frictional Properties and Seismogenic Potential of Caprock Shales |
author_facet |
Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin |
author_sort |
Bahman Bohloli |
title |
Frictional Properties and Seismogenic Potential of Caprock Shales |
title_short |
Frictional Properties and Seismogenic Potential of Caprock Shales |
title_full |
Frictional Properties and Seismogenic Potential of Caprock Shales |
title_fullStr |
Frictional Properties and Seismogenic Potential of Caprock Shales |
title_full_unstemmed |
Frictional Properties and Seismogenic Potential of Caprock Shales |
title_sort |
frictional properties and seismogenic potential of caprock shales |
url |
https://www.mdpi.com/1996-1073/13/23/6275/pdf https://www.mdpi.com/1996-1073/13/23/6275/ |
long_lat |
ENVELOPE(18.217,18.217,77.983,77.983) |
geographic |
Svalbard Norway Rurikfjellet |
geographic_facet |
Svalbard Norway Rurikfjellet |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
https://www.mdpi.com/1996-1073/13/23/6275/pdf https://www.mdpi.com/1996-1073/13/23/6275/ |
_version_ |
1796298536280653824 |