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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ftdoajarticles:oai:doaj.org/article:6fd33bef879448c689d240ad0ff9403e 2023-05-15T18:29:51+02:00 Frictional Properties and Seismogenic Potential of Caprock Shales Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin 2020-11-01T00:00:00Z https://doi.org/10.3390/en13236275 https://doaj.org/article/6fd33bef879448c689d240ad0ff9403e EN eng MDPI AG https://www.mdpi.com/1996-1073/13/23/6275 https://doaj.org/toc/1996-1073 doi:10.3390/en13236275 1996-1073 https://doaj.org/article/6fd33bef879448c689d240ad0ff9403e Energies, Vol 13, Iss 6275, p 6275 (2020) direct shear velocity-stepping friction shale CO 2 storage seismicity Technology T article 2020 ftdoajarticles https://doi.org/10.3390/en13236275 2022-12-30T20:28:19Z 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. Article in Journal/Newspaper Svalbard Directory of Open Access Journals: DOAJ Articles Norway Rurikfjellet ENVELOPE(18.217,18.217,77.983,77.983) Svalbard Energies 13 23 6275 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
direct shear velocity-stepping friction shale CO 2 storage seismicity Technology T |
spellingShingle |
direct shear velocity-stepping friction shale CO 2 storage seismicity Technology T Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin Frictional Properties and Seismogenic Potential of Caprock Shales |
topic_facet |
direct shear velocity-stepping friction shale CO 2 storage seismicity Technology T |
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. |
format |
Article in Journal/Newspaper |
author |
Bahman Bohloli Magnus Soldal Halvard Smith Elin Skurtveit Jung Chan Choi Guillaume Sauvin |
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 |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/en13236275 https://doaj.org/article/6fd33bef879448c689d240ad0ff9403e |
long_lat |
ENVELOPE(18.217,18.217,77.983,77.983) |
geographic |
Norway Rurikfjellet Svalbard |
geographic_facet |
Norway Rurikfjellet Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Energies, Vol 13, Iss 6275, p 6275 (2020) |
op_relation |
https://www.mdpi.com/1996-1073/13/23/6275 https://doaj.org/toc/1996-1073 doi:10.3390/en13236275 1996-1073 https://doaj.org/article/6fd33bef879448c689d240ad0ff9403e |
op_doi |
https://doi.org/10.3390/en13236275 |
container_title |
Energies |
container_volume |
13 |
container_issue |
23 |
container_start_page |
6275 |
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1766213271525785600 |