内蒙古自治区桌子山煤田煤层气地质特征

Coalbed gas geological characteristics in Zhuozishan Coalfield,Inner Mongolia

根据测试资料及前人研究成果,分析了桌子山煤田煤变质程度、构造特征、煤层顶底板岩性对煤层含气量的影响作用。认为:桌子山煤田煤变质程度高,煤层埋深与含气量之间关系密切;煤层顶底板对煤层气的封堵作用明显,逆冲断层发育,对煤层气的保存有利。桌子山煤田煤层气成藏模式属构造-地层复合圈闭类型。

Based on the measured date and studying results,the paper analyzes the influence factors from the coal metamorphic degree,structure features,as well as the roof and floor lithologic characters.The authors have found that the high metamorphic degree of coal,coal seam buried depth has a close relation between gas content,and the gas content is obviously controlled by burial depth;Coal seam or threatening the CBM plugging effect is obvious,Thrust fault development,favorable to coalbed gas preservation.The coalbed gas formation modes of reservoir is stratigraphic and structural traps in Zhuozishan Coalfield.