期刊
JOURNAL OF FLUID MECHANICS
卷 662, 期 -, 页码 329-351出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112010003319
关键词
gravity currents; porous media
资金
- Martin Family Society
- ARCO Chair in Energy Studies
- Reed Research Fund
- US Department of Energy [DE-FE0002041]
Injection of carbon dioxide (CO2) into geological formations is widely regarded as a promising tool for reducing global atmospheric CO2 emissions. To evaluate injection scenarios, estimate reservoir capacity and assess leakage risks, an accurate understanding of the subsurface spreading and migration of the plume of mobile CO2 is essential. Here, we present a complete solution to a theoretical model for the subsurface migration of a plume of CO2 due to natural groundwater flow and aquifer slope, and subject to residual trapping. The results show that the interplay of these effects leads to non-trivial behaviour in terms of trapping efficiency. The analytical nature of the solution offers insight into the physics of CO2 migration, and allows for rapid, basin-specific capacity estimation. We use the solution to explore the parameter space via the storage efficiency, a macroscopic measure of plume migration. In a future study, we shall incorporate CO2 dissolution into the migration model and study the importance of dissolution relative to capillary trapping and the impact of dissolution on the storage efficiency.
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