对采自鄂尔多斯盆地侏罗系煤层气勘探开发地区的煤样,采用压汞、低温液氮试验、显微镜观测等手段,研究了煤储层孔隙类型、孔隙连通性、孔隙形态及煤心煤样的裂隙密度、裂隙连通性、裂隙发育特征。研究表明:鄂尔多斯盆地南部煤储层的似孔喉比比较小(一般小于15),退汞效率比较高(大于50%),采收率较高,排驱压力一般大于0.7 MPa,最大进汞饱和度小于65%,煤的孔隙度小于12%,煤储层渗透率小于0.01×10-3μm2,产能较高,对煤层气开发比较有利。煤层气井的煤心煤样观测显示,盆地内煤层多为原生结构煤,盆地南部焦坪、大佛寺一带煤中裂隙较发育,连通性中等,对煤层气开发相对有利。

As for the coal samples from the Jurassic System coal bed methane exploration development area in Erdos Basin,the pressurized mercury,low temperat ure liquid nitrogen test,microscope observation and other means were applied to study the pore type,pore connectivity and pore form of the coal reservoirs and the crac k density,crack connectivity and crack development features of the coal core samples.The study showed that the like pore-throat ratio of the coal reservoirs in the south part of the Erdos Basin was low(generally lower than 15),the mercury withdrawal efficiency was quite high(higher than 50% ),the mining recovery rate was high and the displacement pressure was generally higher than 0.7 MPa.The max mercury injection saturation was lower than 65%.The coal porosity was lower than 12%,the permea bility of the coal reservoirs was lower than 0.01x 10-3 μm2 and the production capacity would be high.Thus all above would be favorable to the coal bed methane develo pment.The observation of the coal core samples from the coal bed methane well showed that the seams in the basin would be primary structure coal generally,the crack s in the coal in the Jiaoping and Dafosi Area,the south part of the basin were well developed and the connectivity was medium.All would be favorable to the coal bed me thane development.

国家科技重大专项资助项目(2011ZX05033-002)；