鄂尔多斯盆地西缘煤层气成藏条件研究  

Study on CBM Reservoiring Condition in Ordos Basin Western Margin

作　　者：徐浩[1] 刘金城[1] 刘亢[1] 秦国红[1] 叶蕾[1] 刘祥宇[1] 曹代勇[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《中国煤炭地质》2015年第7期37-42,51,共7页Coal Geology of China

基　　金：中国地质调查"鄂尔多斯盆地煤系矿产资源赋存规律与资源评价"(12120114012201)项目

摘　　要：鄂尔多斯盆地西缘发育石炭-二叠纪和侏罗纪两套含煤岩系,由北向南发育五大煤田,煤层发育,厚度较大,煤炭资源量丰富。石炭-二叠系煤层煤级高,Ro值为0.51%-1.89%,均值为0.95%,以肥煤、焦煤、无烟煤为主,宏观煤岩成分以暗煤和亮煤为主,煤岩类型主要为半亮煤和半暗煤;侏罗系煤层煤级低,Ro值为0.5%-2.7%,均值为0.72%,以气煤、不黏煤、长焰煤为主,宏观煤岩成分以暗煤为主,煤岩类型主要为半暗煤和暗淡煤为主。两套煤层煤岩显微组分均以镜质组和壳质组为主,属于Ⅲ型（腐殖型）有机质,煤的变质程度均为低成熟到高成熟阶段,具有良好的生气潜能,以生成湿气为主。侏罗系煤层孔隙度高于石炭-二叠系煤层,而石炭-二叠系煤层吸附性能强于侏罗系煤层,煤层含气性较好。In the Ordos Basin western margin has developed Permo-Carboniferous and Jurassic two sets of coal-bearing rock series.Five large coalfields have been developed from north to south with well developed rather thick coal seams, abundant coal resources.Coal seams in Permo-Carboniferous have high coal ranks with Ro value 0.51-1.89%, average 0.95%; mainly fat coal, coking coal and anthracite; lithotype of coal is mainly durain and clarain; macrolithotype of coal is mainly semibright coal and semidull coal. Jurassic coal seams have low coal ranks with Ro value 0.5%-2.7%, average 0.72%; mainly gas coal, non caking coal and long flame coal;lithotype of coal is mainly durain; macrolithotype is mainly semidull coal and dull coal. Maceral groups of two sets of coal seams are mainly vitrinite and exinite, belong to type III（humic type） organic matter. Degree of coal metamorphism is from low maturity to high maturity stages with favorable gas generation potential, mainly wet gas. Porosity of Jurassic coal seams is higher than Permo-Carboniferous coal seams, while the adsorption performance of Permo-Carboniferous coal seams is better than Jurassic coal seams; coal seam gasbearing property is preferable.

关 键 词：鄂尔多斯盆地西缘 煤层气 储层特征 含气性 

分 类 号：P618.11[天文地球—矿床学]