Numerical Simulation of CO 2 Storage in Subseabed Sediments in the Shenhu Area, South China Sea: The Effect of Reservoir Permeability Anisotropy

Le résumé fourni par la source

CCUS has been an important technological approach to mitigate global warming, and CO 2 storage plays a key role in this process. The ocean is a huge potential carbon sink; therein, CO 2 injected into subseabed sediments will form relatively stable CO 2 hydrate under the appropriate conditions, which is expected to achieve long-term CO 2 storage. Of special interest is that marine sediments are generally anisotropic in permeability; this would significantly affect the resulting storage behavior of CO 2 . In this study, by constructing a large-scale numerical model of CO 2 storage in the South China Sea, we investigated the effect of permeability anisotropy on CO 2 transport and transformation. The results show that the mass of CO 2 stored in the free phase is higher than that in the hydrate phase during the CO 2 storage process; the CO 2 hydrate storage efficiency is larger in reservoirs with large permeability anisotropy values; the increase in R hv expands the horizontal extent of the hydrate cap but restricts the hydrate volume in the vertical zone. In addition, the study proposed a double-layer CO 2 injection method assisted by increasing the vertical pressure to improve the hydrate storage efficiency. These findings provide a scientific basis for CO 2 storage in subseabed reservoirs with permeability anisotropy.

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