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陕甘宁盆地是一个大型聚煤盆地，上古生界石炭—二叠系和中生界侏罗系是其两套主要的含煤层系。石炭—二叠系煤层镜质组含量高，热变质程度较高，含气量大，煤层气资源量为６８×１０１２ｍ３，有利勘探部位主要位于盆地东缘和西缘；侏罗系煤层镜质组含量较低，热变质程度低，含气量相对较小，煤层气资源量为４２×１０１２ｍ３，有利勘探目标主要分布在盆地内部。指出了上述两套层系的６个勘探目标，其中侏罗系煤层气有利目标区为：正宁地区、乌审旗地区；石炭—二叠系煤层气有利目标区为：吴堡—永和地区、韩城地区、银洞子地区、横山堡地区。

PRIMARY EVALUATION OF THE SELECTED AREAS FOR COAL-BED GAS EXPLORATION IN SHANGANNING BASIN

??Shanganning Basin is a large scale coal-bearing basin and its two sets of major coal-bearing series are Permo-Carboniferous of Upper Paleozoic and Jurassic of Mesozoic.In the Permo-Carboniferous coal bed,the vitrinite content is high,thermal metamorphic grade is relatively high,gas content is large,and the resource extent of coal-bed gas reaches 6.8×10¹²m³.The beneficial exploration regions are mainly situated at the east and west boundaries of the basin.In the Jurassic coal bed,the vitrinite content is relatively low,thermal metamorphic grade is low,gas content is relatively small and the resource extent of coal-bed gas is 4.2×10¹²m³.The beneficial exploration objects are mainly distributed in the interion of the basin.Six exploration objects of the two sets of series mentioned above are pointed out,in which the beneficial exploration objects for coal-bed gas in Jurassic are at Zhengning and Wushen Banner districts;but those for coal-bed gas in Permo-Carboniferous are at Wubu-Yonghe,Hancheng,Yindongzi and Hengshanpu districts.