Journal
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
Volume 119, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2022.103728
Keywords
Sub-seabedCO2 storage; Geological formation; CO2 hydrate formation; Numerical simulation; Reservoir scale
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CO2 capture and storage is a promising strategy to combat global warming. CO2 hydrate formation can help suppress CO2 leakage, with the sealing effect depending on the absolute permeability of the storage site.
CO2 capture and storage is a promising strategy against global warming. Although there is concern about the risk of CO2 leakage from deep saline aquifers, it is expected that CO2 hydrate formation suppresses the leakage in the sub-seabed sediment, depending on the water depth of a storage site. Therefore, hydrate formation in the sub -seabed sand sediments is one of key factors in lowering the risk of CO2 leakage and it is important to know conditions under which CO2 leakage is suppressed by hydrate formation. To estimate the sealing effect of CO2 hydrate against CO2 leakage beneath the seabed, a numerical simulation method of hydrate formation in sand sediments can be a useful tool. The simulation results suggest that, under the given conditions, it was shown that the sealing effect due to the hydrate formation can be expected, except for the case of an absolute permeability of 10-12 m, at which leaked CO2 can reach the seafloor for all the leakage rates tested in this study. From these results, it is suggested that whether CO2 hydrate suppresses the leakage of liquid CO2 mainly depends on the absolute permeability of a selected sea area.
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