窑街煤田CO_2成因及成藏模式研究  

Research on the genesis and accumulation of carbon dioxide in the Yaojie coalfield

作　　者：李伟[1] 程远平[1] 杨云峰 王立国[1] 陈海栋[1] 杨跃奎[1] 

机构地区：[1]中国矿业大学煤矿瓦斯治理国家工程研究中心,江苏徐州221008 [2]窑街煤电公司通风灭火部,甘肃兰州730084

出　　处：《中国矿业大学学报》2011年第2期190-195,共6页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2005CB221503);国家自然科学基金项目(50674089);国家青年自然科学基金项目(50904068);中国矿业大学青年科研基金项目(OY091223)

摘　　要：为有效防治窑街煤田煤与CO2突出,基于煤二层中CO2成因、成藏过程对防治突出的重要性,采用对煤二层中CO2气样的碳同位素偏差值、氦同位素比值实验测定分析方法,探讨了F19断裂带演化过程、岩浆活动以及构造岩分布特征,提出了CO2的来源与运移、成藏过程.结果表明:煤二层中CO2为无机壳源,F19断裂带脆-韧性剪切动力变质作用生成CO2为煤层CO2的具体来源,F19断裂在CO2成藏过程中起到了成气断裂、储气断裂、圈闭断裂的作用,结合无机CO2成藏模式研究,窑街煤田CO2为由F19断裂带成气、输导作用下的直接成藏模式,运移至断裂中高压储存的CO2不断的向煤二层运移,并在良好的圈闭条件下富集成藏.The origin and accumulation of CO2 in coal seams is key to the outburst of coal and CO2.A study of carbon and helium isotopes in CO2 gas samples from the Number 2 coal seam in the Yaojie coalfield was undertaken.The evolution and magmatism of tectonic rocks in the F19 fault zone are discussed.Three different factors are used to describe CO2 evolution： Sources,migration,and accumulation.The CO2 in the Number 2 coal seam originates from an inorganic source in the crust.Brittle-ductile shear dynamic metamorphism of the F19 fault played an important role in the evolution of the CO2.Originating,accumulating and trapping fractures are all involved in this process.The CO2 accumulated in the Yaojie coalfield because of F19 fault fracturing,became stored under high pressure and migrated to the Number 2 coal seam.Diffusing CO2 slowly accumulated where conditions were favorable for trapping.

关 键 词：窑街煤田 CO2成因 成藏模式 同位素 断裂 

分 类 号：TD713[矿业工程—矿井通风与安全]