Effects of Reservoir Heterogeneity on CO 2 Dissolution Efficiency in Randomly Multilayered Formations

Xiaoyu Fang, Yanxin Lv (), Chao Yuan, Xiaohua Zhu, Junyang Guo, Weiji Liu and Haibo Li
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Xiaoyu Fang: Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524006, China
Yanxin Lv: Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524006, China
Chao Yuan: Shenzhen Key Laboratory of Deep Engineering Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Xiaohua Zhu: School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
Junyang Guo: Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524006, China
Weiji Liu: School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
Haibo Li: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Energies, 2023, vol. 16, issue 13, 1-15

Abstract: Carbon dioxide (CO 2 ) dissolution is the secondary trapping mechanism enhancing the long-term security of CO 2 in confined geological formations. CO 2 injected into a randomly multilayered formation will preferentially migrate along high permeability layers, increasing CO 2 dissolution efficiency. In this study, sequential Gaussian simulation is adopted to construct the stratified saline formations, and two-phase flow based on MRST is established to illustrate the spatial mobility and distribution of CO 2 migration. The results show that gravity index G and permeability heterogeneity σ Y 2 are the two predominant factors controlling the spatial mobility and distribution of CO 2 transports. The CO 2 migration shows a totally different spatial mobility under different gravity index and heterogeneity. When the permeability discrepancy is relatively larger, CO 2 preferentially migrates along the horizontal layer without accompanying the vertical migration. For the formation controlled by gravity index, CO 2 migration is governed by supercritical gaseous characteristics. For the medium gravity index, the upward and lateral flow characteristics of the CO 2 plume is determined by gravity index and heterogeneity. When the gravity index is smaller, permeability heterogeneity is the key factor influencing CO 2 plume characteristics. Permeability heterogeneity is the decisive factor in determining final CO 2 dissolution efficiency. This investigation of CO 2 mobility in randomly multilayered reservoirs provides an effective reference for CO 2 storage.

Keywords: geological CO 2 storage; heterogeneity; dissolution efficiency; upscaling permeability; CO 2 plume (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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