Extending geologic carbon storage from sedimentary formations to deep volcanic areas: Effects of cooling-induced stress on caprock and fault stability
Geologic carbon storage at the Gt scale is necessary to reach zero, and even negative, emissions in order to mitigate climate change. Yet, CO2 storage will only be successful if the risks of induced seismicity and CO2 leakage remain low. Controlling the former risk is favored by the low viscosity of CO2, which induces a pore pressure buildup that is practically constant with time, facilitating pressure management. The latter risk relies on the low-permeable and high-entry pressure caprock because CO2 is buoyant in deep saline formations. The caprock sealing capacity may be affected by thermally-induced stresses because the injected CO2 typically reaches the storage formation at a colder temperature than that of the rock. To reduce the risk of leakage, it has been recently proposed to store CO2 in deep volcanic areas above 375 °C because, at such conditions, CO2 is denser than the resident water. This novel storage concept enhances the options for a widespread CO2 storage, reducing CO2 leakage risk. Nonetheless, the risk of induced seismicity may be enhanced in the long term as the cooling front advances into the storage formation.
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| Format: | comunicación de congreso biblioteca |
| Language: | English |
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2021-02
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| Subjects: | Carbon capture and storage (CCS), |
| Online Access: | http://hdl.handle.net/10261/233048 |
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