期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 15, 页码 3878-3882出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50658
关键词
CO2 capillary trapping; wettability; X-ray CT scanning; pore-scale; grain shape; two-phase flow
资金
- Center for Frontiers of Subsurface Energy Security (CFSES) at the University of Texas at Austin, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001114]
- National Science Foundation [EAR-0948842]
- Geology Foundation of the University of Texas
- ExxonMobil
The capillary trapping of supercritical CO2 (s-CO2) is postulated to comprise up to 90% of permanently trapped CO2 injected during geologic sequestration. Successive s-CO2/brine flooding experiments under reservoir conditions showed that water-wet rounded beads trapped 15% of injected s-CO2 both as clusters and as individual ganglia, whereas CO2-wet beads trapped only 2% of the injected s-CO2 as minute pockets in pore constrictions. Angular water-wet grains trapped 20% of the CO2 but flow was affected by preferential flow. Thus, capillary trapping is a viable mechanism for the permanent CO2 storage, but its success is constrained by the media wettability.
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