Competitive adsorption characteristics and diffusion process of CO2−CH4 on mineral surface: A case study of the 2nd Section of Shanxi Formationin Yan 'an Gas Field

LIN Jin; WANG Xinwen; WANG Xiangzen; HE Qincheng; MENG Xiangzhen; LÜ Min; WANG Quanbo; YANG Lichao

doi:10.12029/gc20230813002

GEOLOGY IN CHINA > 2025 > Corrected proof > DOI: 10.12029/gc20230813002

Lin Jin, Wang Xinwen, Wang Xiangzen, He Qincheng, Meng Xiangzhen, Lü Min, Wang Quanbo, Yang Lichao. 2025. Competitive adsorption characteristics and diffusion process of CO₂−CH₄ on mineral surface: A case study of the 2^nd Section of Shanxi Formationin Yan 'an Gas Field[J]. Geology in China, 52(2): 706−715. DOI: 10.12029/gc20230813002

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Competitive adsorption characteristics and diffusion process of CO₂−CH₄ on mineral surface: A case study of the 2^nd Section of Shanxi Formationin Yan 'an Gas Field

1.
Shanxi Yanchang Petroleum (Group) Co., LTD., Yanchang Petroleum Research Center, Xi'an 710075, Shaanxi, China
2.
Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Carbon Sequestration and Geological Energy Storage Engineering Innovation Center, Ministry of Natural Resources, Beijing 100037, China

Funds: Supported by Suitability Evaluation and Injection Scheme Study for CO₂ Enhanced Gas Recovery and Geological Storage in the Yanchang Gas Field (No.KT0722SFW0001); the project of the China Geological Survey (No. DD20221819), National Natural Science Foundation (No.U2244215) and Central Scientific Research Institution Fundamental Research Funds Project (No.JKY202206).

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Author Bio:
LIN Jin, male, born in 1968, senior engineer，mainly engaged in the research of oil and gas exploration and development technologies; E-mail:linjinn@163.com
Corresponding author:
WANG Xiang zeng, male, born in 1968, senior engineer, mainly engaged in the research oftight oil and gas extraction engineering technology; E-mail: sxycpcwxz@126.com.
Received Date: August 12, 2023
Revised Date: January 29, 2024
Available Online: March 23, 2025

Graphical Abstract

Abstract

Abstract

This paper is the result of environmental geological survey engineering.
Objective
The CO₂−Enhanced Gas Recovery (CO₂−EGR) technology significantly augments natural gas extraction efficiency while concurrently facilitating the permanent subsurface sequestration of CO₂. This dual benefit substantially aids in achieving carbon neutrality goals. The mechanisms pivotal to enhanced recovery and storage include the competitive adsorption and diffusion of CO₂−CH₄ within nanopores.
Methods
This study focuses on the 2^ndsection of Shanxi formation in the Yan'an Gas Field located in the Ordos Basin. Using molecular dynamics (MD) and grand canonical Monte Carlo (GCMC) methods, a model was established toinvestigate the competitive adsorption behaviors of CO₂−CH₄ mixed gases in the nanoporous matrices of key minerals, specifically quartz and illite, under reservoir−specific temperature and pressure conditions. Additionally, the study analyzes the correlation between the self−diffusion coefficient of CO₂ and the variabilities in temperature and pressure.
Results
The study yields several findings: (1) At an isothermal condition of 353.15 K and varying pressures from 5.9 to 17.7 MPa, both quartz and illite exhibit heightened adsorptive capacities for CO₂ in comparison to CH₄. Furthermore, the competitive adsorption selectivity for CO₂−CH₄ is found to be greater in quartz pores than in illite pores. (2) Under similar isothermal conditions and at a constant pressure of 11.8 MPa with temperatures ranging from 313.15 K to 373.15 K, the competitive adsorption selectivity for CO₂−CH₄ in both quartz and illite pores is observed to diminish with increasing pressure and temperature. (3) Under conditions of low pressure (5.9 MPa) and high temperature (373.15 K), there is an enhancement in the mobility and diffusion efficiency of CO₂ within both CO₂−CH₄−quartz and CO₂−CH₄−illite systems.
Conclusion
Quartz and illite have higher CO₂ adsorption capacity, greaterCH₄displacement capacity, and better CO₂ storage effect.
Highlights
The competitive adsorption and diffusion behavior of CO₂−CH₄ in nanopores is clarified, and the self-diffusion characteristics of CO₂ under the reservoir conditions of the 2^nd Section of the Shanxi Formation in the Yan’an Gas Field is identified.

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References

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Competitive adsorption characteristics and diffusion process of CO₂−CH₄ on mineral surface: A case study of the 2^nd Section of Shanxi Formationin Yan 'an Gas Field

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Competitive adsorption characteristics and diffusion process of CO₂−CH₄ on mineral surface: A case study of the 2^nd Section of Shanxi Formationin Yan 'an Gas Field