矿产保护与利用2025，Vol.45Issue(5)：50-64,15.DOI:10.13779/j.cnki.issn1001-0076.2025.05.004
煤炭地下气化燃空区CO2地质封存的研究进展及未来探索
Research Progress and Future Perspectives of CO2 Geologic Sequestration in Underground Coal Gasification Combustion Zones
摘要
Abstract
Driven by energy structural transformation and the"dual carbon"goals,underground coal gasification(UCG)has drawn significant attention as a key technology for clean coal utilization.Research has shown that UCG,with its unique high-permeability fracture network,strong adsorption capacity of residual coke,and high-temperature geological environment,has significant potential as an emerging CO2 geological storage medium.This study systematically investigated the formation mechanism and spatial fixation of the combustion cavity,revealing the multiphase migration characteristics of CO2 within the cavity:early on,driven by buoyancy,it accumulates beneath the caprock to form structural traps.Locally,it is physically adsorbed by residual coke through diffusion,and over time,it undergoes mineralization reactions with alkaline ash residues to form stable carbonates.To assess storage safety,this study employed Thermo-Hydro-Mechanical-Chemical(THMC)multi-field coupled simulation simulation technology to characterize the rock mass stress distortion and fracture propagation induced by CO2 migration.Furthermore,it identified caprock defects,injection pressure threshold,and cavity size as key control parameters influencing long-term stability.Key conclusions indicate that Coupling with carbon capture and storage(CCS)can significantly reduce the carbon footprint of UCG,offering a new paradigm for low-carbon coal development.However,current challenges include reduced gas injection efficiency due to heterogeneous residue distribution,the lack of a mechanism for thermal damage associated with CO2-surrounding rock formation,and inaccurate predictions of further caprock fracture formation.Future research should focus on developing multiphase transport-mineralization kinetic reaction models,investigating dynamic fracture monitoring,and optimizing"annular backfill structures"to advance the potential of this technology toward engineering applications.关键词
煤炭地下气化/燃空区/CO2封存/地质封存/CO2迁移规律/多场耦合Key words
underground coal gasification/combustion cavity/carbon dioxide storage/geological storage/CO2 migration patterns/multi-field coupled simulation分类
矿山工程引用本文复制引用
辛林,宋永坤,李欣颖,谭一,杨敏,王若男,牛茂斐,闵令冉,刁垌彤,杨冰玉,张凯榕..煤炭地下气化燃空区CO2地质封存的研究进展及未来探索[J].矿产保护与利用,2025,45(5):50-64,15.基金项目
国家自然科学基金资助项目(52374211,52304190,52304060) （52374211,52304190,52304060）
山东省自然科学基金项目(ZR2023QE117,ZR2024QE029) （ZR2023QE117,ZR2024QE029）
山东省泰山学者青年专家项目(TSQN202507183) （TSQN202507183）
