Residual Saturation Effects on CO₂ Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models

Chu, Bingfei1,2; Feng, Guanhong3; Zhang, Yan1,2; Qi, Shengwen1,2; Li, Pushuang4; Huang, Tianming1,2

2023-09-01

10.3390/w15183316

WATER   Impact Factor & Quartile

2073-4441

In CO2 geological storage, multiphase flow plays a vital role in the movement and distribution of CO2. However, due to the limitations of fluid buoyancy and capillary forces, CO2 encounters challenges in penetrating the caprock, and the potential for leakage remains a concern due to variations in injection conditions. The migration and distribution of CO2 in the process of CO2 geological storage in saline formations are determined by relative permeability and capillary pressure, which are key factors. Consequently, this study focuses on two essential models: relative permeability and capillary pressure models. A two-dimensional isothermal reservoir-caprock model was constructed, utilizing data from the Shenhua CCS demonstration project. The analysis indicates that the core parameters in the model are residual gas saturation and residual water saturation. Specifically, residual gas saturation governs the diffusion distance of CO(2 )within the reservoir-caprock system, while its combined effect with residual water saturation affects the permeation rate of CO2. Through the application of the Analytic Hierarchy Process (AHP) to analyze the impact of different models on caprock integrity, it was determined that when selecting caprock models and optimizing parameters, precedence should be given to models with lower residual saturation and caprocks that offer sufficient capillary pressure for optimal sealing effects. These research findings can serve as references for practical CO(2 )storage projects, providing guidance on activities such as adjusting water injection strategies and controlling gas injection pressures to optimize geological storage efficiency.

CO2 geological storage relative permeability model capillary pressure model multiphase flow AHP

SCI

English

Others

National Natural Science Foundation of China[42141009] ; IGGCAS Key programme["IGGCAS-202201","IGGCAS-202204"] ; Youth Innovation Promotion Association Foundation of the Chinese Academy of Sciences[2019069]

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:001077776000001

MDPI

Web of Science

1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Jilin Univ, Key Lab Groundwater Resources & Environm, Minist Educ, Changchun 130021, Peoples R China
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Chu, Bingfei,Feng, Guanhong,Zhang, Yan,et al. Residual Saturation Effects on CO₂ Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models[J]. WATER,2023,15(18).

Chu, Bingfei,Feng, Guanhong,Zhang, Yan,Qi, Shengwen,Li, Pushuang,&Huang, Tianming.(2023).Residual Saturation Effects on CO₂ Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models.WATER,15(18).

Chu, Bingfei,et al."Residual Saturation Effects on CO₂ Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models".WATER 15.18(2023).