Capillary trapping characteristics of CO2 sequestration in fractured carbonate rock and sandstone using MRI

Teng，Ying1,2; Wang，Pengfei3,4; Xie，Heping1,2; Zhu，Jianbo1,2

2022-12-01

10.1016/j.jngse.2022.104809

Journal of Natural Gas Science and Engineering   Impact Factor & Quartile

1875-5100

2212-3865

Capillary trapping is a prominent short-term trapping mechanism that achieves the maximum storage capacity and ensures the integrity of CO sequestration in deep saline aquifers on an industrial scale. To maximize capillary trapping, fluid injection scenarios need to be investigated, and the fluid flowing characteristics in porous reservoir media need to be acknowledged. In this study, magnetic resonance imaging (MRI) technology was used to examine the distribution of three fluid pairs in fractured carbonate rock and sandstone under reservoir conditions, and the relative permeability and capillary pressure were determined based on their capillary end saturation profiles. The initial gas saturation increased with the injection rate, and the fractured structure created a preferential flow channel that affected the saturation distribution. Differences in interfacial tension and wettability lead to different capillary pressures. The low interfacial tension of the scCO/water fluid pair and its strong water-wet properties in sandstone caused high relative permeability and residual gas saturation. These results imply that the influence of the fluid injection method and reservoir properties on capillary trapping characteristics should be investigated in detail before implementing CO geological sequestration.

Capillary end effect Capillary trapping CO2 storage MRI

SCI

English

Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2019A1515110855];Guangdong Science and Technology Department[2019ZT08G315];National Natural Science Foundation of China[51827901];National Natural Science Foundation of China[52006118];National Natural Science Foundation of China[52106092];Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[K19313901];

Energy & Fuels ; Engineering

Energy & Fuels ; Engineering, Chemical

WOS:000874149100002

ELSEVIER SCI LTD

2-s2.0-85139727588

Scopus

1.Shenzhen Key Laboratory of Deep Engineering Sciences and Green Energy,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China
2.Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Shenzhen University,Shenzhen,518060,China
3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China
4.Shenzhen Key Laboratory of Natural Gas Hydrates & Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China

Teng，Ying,Wang，Pengfei,Xie，Heping,et al. Capillary trapping characteristics of CO2 sequestration in fractured carbonate rock and sandstone using MRI[J]. Journal of Natural Gas Science and Engineering,2022,108.

Teng，Ying,Wang，Pengfei,Xie，Heping,&Zhu，Jianbo.(2022).Capillary trapping characteristics of CO2 sequestration in fractured carbonate rock and sandstone using MRI.Journal of Natural Gas Science and Engineering,108.

Teng，Ying,et al."Capillary trapping characteristics of CO2 sequestration in fractured carbonate rock and sandstone using MRI".Journal of Natural Gas Science and Engineering 108(2022).