煤田地质与勘探2025，Vol.53Issue(12)：88-99,12.DOI:10.12363/issn.1001-1986.25.06.0447
黔西地区玄武岩CO2矿化反应的储层响应特征与地质固碳前景
Reservoir responses to reactions in CO2 mineral trapping and geologic carbon sequestration prospects for basalts in western Guizhou Province,China
摘要
Abstract
[Background]Geologic CO2 sequestration in basalts has attracted wide attention in recent years owing to its safe,stable,and efficient CO2 trapping mechanisms.[Methods]Focusing on basalts in the Longtan Formation within western Guizhou Province,China,this study simulated the CO2-water-basalt geochemical reactions under varying tem-peratures,pressures,and times.Through tests and comparison of mineralogy,geochemistry,and reservoir physical prop-erties before and after the reactions,this study investigated the factors influencing the reactions and elucidated the post-reaction co-evolution mechanism between minerals and pores.Furthermore,the mechanisms behind CO2 trapping in basalts were summarized,and the prospects of geologic CO2 sequestration in basalts in southwestern China were ex-plored.[Results]The temperature,pressure,and reaction time exhibited different influence mechanisms on mineral dis-solution and precipitation during CO2-water-basalt reactions.Nevertheless,a high temperature(200 ℃),high pressure(＞12 MPa),and long reaction time(20 days)could promote the precipitation of carbonate minerals.The reactions dur-ing CO2 trapping in basalts were essentially the dissolution and corrosion of original minerals,coupled with the genera-tion of new minerals.In their early stage,the reactions were dominated by the corrosion of plagioclases,augite,and minor altered minerals.With increases in Ca2+and Mg2+concentrations in the solution,the precipitation of calcites,dolo-mites,and clay minerals intensified gradually.During CO2-water-basalt reactions,the reservoir pores and fractures showed a three-stage evolution pattern,which was coupled with dissolution-precipitation reactions.During the reaction process,the reservoir porosity and permeability jointly increased in the early stage;continuously increased but de-creased,respectively,in the middle stage,and jointly decreased in the late stage.The CO2 mineral trapping in basalts was characterized by complex reaction types,which corresponded to intricate reservoir response processes.The carbonate precipitation was identified as the core mechanism behind the reactions.[Conclusions]Southwestern China enjoys fa-vorable geological conditions for engineering tests on geologic CO2 sequestration in basalts,such as extensively distrib-uted basalt reservoirs and abundant groundwater rich in Ca2+and Mg2+.Nevertheless,due consideration should be given to the substitution of groundwater with seawater in coastal areas,along with techniques for removing reservoir plugging after reactions in CO2 mineral trapping.The results of this study will provide an important theoretical basis for under-standing the mechanism and feasibility of geologic CO2 sequestration in basalts in southwestern China.关键词
CO2地质封存/玄武岩/溶蚀作用/沉淀作用/孔隙演化/矿化反应/固碳反应Key words
geologic CO2 sequestration/basalt/dissolution/precipitation/pore evolution/reaction during mineral trap-ping/carbon sequestration reaction分类
天文与地球科学引用本文复制引用
韩思杰,艾祉希,刘纪杰,周效志,高为,刘柱..黔西地区玄武岩CO2矿化反应的储层响应特征与地质固碳前景[J].煤田地质与勘探,2025,53(12):88-99,12.基金项目
国家自然科学基金碳中和专项项目(42141012) （42141012）
江苏省青年科技人才托举工程项目(JSTJ-2024-273) （JSTJ-2024-273）
