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| Titel |
Caprock integrity and induced seismicity from laboratory and numerical experiments |
| VerfasserIn |
Victor Vilarrasa, Roman Makhnenko |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137507
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| Publikation (Nr.) |
 EGU/EGU2017-237.pdf |
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| Zusammenfassung |
| CO2 leakage, either across the caprock or through faults, is a major concern for geologic carbon storage. To assess the caprock sealing capacity and the strength of faults, we investigate clay-rich geomaterials in the laboratory. We focus on the thermo-hydro-mechanical coupled processes that shale may undergo during CO2 storage. Specimens of Opalinus clay – a Swiss shale – are brought to the conditions of suitable storage formations (1 km depth) and are fully saturated with in-situ brine. Poro-thermo-mechanical parameters are measured in drained, undrained, and unjacketed compression experiments. We use the measured parameters at the laboratory as input data to a numerical model that simulates CO2 injection in a deep saline aquifer bounded by a low-permeable fault. We find that the caprock sealing capacity is maintained and that even the fault may undergo a series of microseismic events, leakage is unlikely to occur through the ductile clay-rich fault. |
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