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- W4289778971 abstract "Sub-seabed sequestration of carbon dioxide (CO2) is the most promising and feasible disposal of large-scale carbon storage, and the capacity and safety of CO2 sequestration are vital considerations. However, the leakage prevention of injected CO2 lacks necessary solutions and experimental investigations. In this study, the upward leakage process of sequestrated CO2 through water-saturated sediments was simulated at constant 277.15 K and 3.0 MPa, and the dynamic water distributions were detected by magnetic resonance imaging (MRI) technique. Both the flux difference of CO2 inflow and outflow and the MRI images reveal the formation of hydrates inside the sediments with seven water saturation (21.6 %∼67.8 %) that represent different stages of sequestrated CO2 leakage process. When the initial water saturation exceeds 26.2 %, the CO2 leakage will be discontinued after several minutes of hydrates formation, indicating the formation of hydrate cap in the CO2-displaced sediment aquifer. Then, the pressure of sequestrated CO2 increases due to the plugging effect of hydrate cap, and the overpressure can reach at least 7.0 MPa. In hydrate cap zone, the overpressure of CO2 greatly improves the storage capacity by at least 13.1 times, which may induce the increase of CO2 sequestration capacity beneath the hydrate cap as well. These results contribute significantly toward safe CO2 sequestration and provide fundamental data for sequestration site selection under sub-seabed areas." @default.
- W4289778971 created "2022-08-04" @default.
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- W4289778971 date "2022-12-01" @default.
- W4289778971 modified "2023-10-06" @default.
- W4289778971 title "Effects of hydrate cap on leakage prevention and capacity improvement of sub-seabed CO2 sequestration" @default.
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- W4289778971 doi "https://doi.org/10.1016/j.cej.2022.138493" @default.
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