内蒙古自治区大青山煤田煤层气资源概况

General Situation of Daqingshan Coalfield CBM Resources,Inner Mongolia Autonomous Region

内蒙古大青山煤田包括拴马桩煤系和石拐煤系,其中石拐煤系五当沟组的GJ、、L煤层是大青山煤田主要可采煤层,煤岩组分中镜质组占绝对优势,具有较强的生烃能力。依据有关矿区瓦斯涌出量连续观测显示,该区瓦斯涌出量大,并随开采深度增加而加大。在构造上本区位于大青山复背斜南翼,压扭性构造发育,对煤层气起到较好的圈闭作用,在五当沟组中分布的致密油页岩在纵向上阻止了煤层气的逸散。根据大青山煤田各种地质因素分析,认为大青山煤田蕴藏着丰富的煤层气资源,煤田的北部、中部可作为重点开发区。

The Inner Mongolia Daqingshan coalfield have Shuanmazhuang coal measures and Shiguai coal measures, in which G, J and L coal seams in Wudanggou Formation, Shiguai coal measures are major mineable coal seams in the coalfield. Vitrinite occupies absolute predominance in maceral groups and has rather strong hydrocarbon generating capacity. According to gas emission continuous observation in related mining areas demonstrated that the area has large gas emission and an increasing trend along with the increasing of mining depth, Structurally, the area is situated at south limb of Daqingshan anticlinorium, compresso-share structures are well developed have better CBM trapping function, and the compact oil shale in Wudanggou Formation stopped CBM escaping longitudinally. Based on analysis of various geological factors in Daqingshan coalfield, considered that abundant CBM resources have containing in the coalfield, while the north and middle parts can be emphasized exploitation areas.