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中文核心期刊

CO2地质封存风险分析的多场耦合数值模拟技术综述

NUMERICAL SIMULATION ON RISK ANALYSIS OF CO2 GEOLOGICAL STORAGE UNDER MULTI-FIELD COUPLING: A REVIEW

  • 摘要: 二氧化碳捕集、利用和封存是现阶段被广泛认可的减少二氧化碳排放最有效的途径之一, 是助力我国实现2060年碳中和目标的重要措施. 在二氧化碳地质封存过程中, 储层−盖层系统多场耦合数值模拟是认识二氧化碳长期封存过程和论证封存安全性的核心技术. 文章对二氧化碳地质封存储层−盖层系统风险分析的流固热化多场耦合数值模拟技术进行了全面综述, 首先给出二氧化碳地质封存多场耦合问题的数学模型, 其基本控制方程包括应力平衡方程、质量和能量守恒方程、化学反应和本构关系等; 其次总结了全耦合、迭代耦合、弱耦合、显式耦合和拟耦合等常用的耦合问题数值解法; 然后介绍了CO2泄漏、地表变形、断层活化和裂缝拓展等地质风险的分析方法; 最后针对当前我国二氧化碳地质封存数值模拟技术面临的主要问题, 对未来的研究方向给出了建议. 论文能够为CO2地质封存场地尺度的相关研究提供有价值的参考.

     

    Abstract: Carbon dioxide capture, utilization, and storage is now widely acknowledged as one of the most effective strategies to reduce atmospheric carbon emissions, as well as the key to advancing China's 2060 carbon neutrality target. The numerical simulation of the underlying T-H-M-C multi-field coupled risk analysis in reservoir-caprock systems is a critical technology for understanding the long-term process and demonstrating storage security during CO2 geological storage. In the present study, we present a comprehensive review on the current research progress of numerical simulation on risk analysis under multi-field coupling during CO2 geological storage. Firstly, we briefly review the research progress in the governing equations, in terms of stress equilibrium equation, mass conservation equation, energy conservation equation, chemical reaction equation, and constitutive equation. Meanwhile, we summarize various numerical coupling solutions, including full coupling, iterative coupling, loose coupling, explicit coupling, and pseudo coupling. Furthermore, we introduce the analysis methods of CO2 leakage, ground deformation, fault activation, and fracture development. Finally, we provide insights into future research directions on the technical challenges which are addressed in the numerical modeling of CO2 geological storage. Our research can provide a valuable reference for the study of CO2 geological storage at site scale.

     

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