鄂尔多斯盆地西缘煤系非常规气共生组合特征

煤炭资源的多重价值体现在含煤岩系中多种矿产资源的共生组合与共采潜力，除煤层自身之外，煤层气、页岩气、致密砂岩气等煤系非常规天然气（煤系气）共生共存的现象已日趋受到业界的关注。研究这些煤系非常规气的共生组合模式，有助于煤系气的综合勘查和开发。通过对鄂尔多斯盆地西缘煤系非常规气成藏地质条件的研究，以典型钻孔的岩性组合、沉积序列和测试数据分析为例，确定了煤系气的有利层段。结果显示：区内太原组上段、山西组下段，以及延安组一段上部、二段和三段具有煤系非常规气的勘探潜力，如JM107钻孔延安组三段876～897 m处，4煤和4上煤附近，为良好的煤系气层段。据此，建立了3种煤系非常规气共生组合模式，初步探讨了煤系非常规气的共生耦合机制。

Combination characteristics of unconventional gas in coal measure in the west margin of Ordos Basin

Multiple values of coal resources were the paragenetic association and symbiotic mining potential of various minerals in coal measures.In addition to coal itself,the closely related formation and distribution of unconventional natural gases (coal measure gases),including coalbed methane,shale gas,tight gas,had attracted a widespread attention.Study on the combination modes of these unconventional natural gases in coal measure can be useful to the comprehensive exploration and integrated development.Based on the study of formation conditions of unconventional gas in the coal measure in the west margin of Ordos Basin,the favorable segment of unconventional gas in the coal measure can be identified by the analysis of lithological combination,sedimentary sequence and test data.It shows that the upper member of Taiyuan formation,the lower member of Shanxi Formation,and the first three members of Yan’an formation have the exploration potential of unconventional gas in the coal measure.For example,876-897 m in the third members of Yan’an formation of drill JM107,near the Coal seam 4 and 4 upper,is the favorable segment of unconventional gas in the coal measure.Through these,three combination modes of unconventional gas in the coal measure can be formed and their coupling mechanism is preliminarily discussed.