[口头报告]Characteristics of CH4-CO2 distribution and diffusion in different burial depths of shale kerogen: A case study of Longmaxi Formation shale in the northeastern Chongqing
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[口头报告]Characteristics of CH4-CO2 distribution and diffusion in different burial depths of shale kerogen: A case study of Longmaxi Formation shale in the northeastern Chongqing

Characteristics of CH4-CO2 distribution and diffusion in different burial depths of shale kerogen: A case study of Longmaxi Formation shale in the northeastern Chongqing
编号:50 稿件编号:311 访问权限:仅限参会人 更新:2024-05-17 18:55:53 浏览:518次 口头报告

报告开始:2024年05月30日 19:20 (Asia/Shanghai)

报告时间:10min

所在会议:[S1] Resource Development and Utilization » [S1-2] Evening of May 30th

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摘要

Objective: This study aims to investigate the characteristics and distribution of CH4-CO2 occurrence in shale kerogen at different depths, and subsequently simulate and analyze the diffusion characteristics of CH4-CO2. The findings will provide an evaluation for the displacement extraction of CO2 in shale gas exploitation and geological CO2 sequestration.
Methods: Micro-pore development in shale kerogen was characterized through experiments, and a micro-pore model corresponding to the experimental results was established based on the macromolecular structure model of kerogen. Furthermore, the competitive adsorption characteristics of CH4-CO2 were simulated and analyzed using the Monte Carlo method, and the molecular motion characteristics of gases were analyzed through molecular dynamics simulation, aiming to provide theoretical guidance for shale gas exploitation and CO2 sequestration.
Results: A micro-pore model for kerogen was established, and the adsorption characteristics of CH4-CO2 at different formation pressures were simulated. With increasing burial depth, at depths of 0-1 km, the adsorption capacity increased rapidly, followed by a slow and plateau-like increase. The number of CO2 adsorption sites was higher than that of CH4. When combined adsorption occurred, the number of adsorption sites for both CO2 and CH4 increased or decreased. The decrease in CH4 adsorption sites was more significant, while the change of CO2 adsorption sites was relatively balanced. This is because the total adsorption amount increases during combined adsorption, and CO2 molecules explore the space more thoroughly.
Conclusion: Shale kerogen possesses interconnected pore networks formed by the development of fissure-like pores and the connection of micro-pores to micro-fractures. CO2 can enter smaller volume micro-pores, increasing its adsorption capacity. CH4 exhibits stronger diffusion characteristics, making it more efficient to utilize CO2 displacement for methane extraction. On the other hand. CO2 has poor diffusion characteristics, indicating its potential effectiveness for geological sequestration.

关键字
Adsorption sites; Diffusion; Simulation; Kerogen
报告人
Tong Zhang
China University of Mining and Technology

稿件作者
Tong Zhang China University of Mining and Technology
Yang Wang China University of Mining and Technology
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