《Table 1 Coal reservoir characteristics of typical CBM blocks in east margin of the Ordos Basin》

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《"Unconventional Natural Gas Accumulations in Stacked Deposits:A Discussion of Upper Paleozoic Coal-Bearing Strata in the East Margin of the Ordos Basin, China"》

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U，Upper coal；L，Lower coal.

The proven CBM resources is approximately 1.2 trillion m3 in the study area，and the proven technically recoverable CBM reserve is about 0.6 trillion m3（Li Yong et al.，2014）.The CBM development blocks and areas can be classified into four parts based on their geologica similarities:Hequ-Baode，Sanjiao-Liulin，Shilou-Linfen and Hancheng.The typical reservoir characteristics of the four areas are shown in Table 1.All CBM blocks show a broad variation in depth，generally from 400 to 1400 m and increasing from east to west.Deep CBM is also reported，for instance，CBM is produced from 2000 m deep coal seam in the Linxing area（Li et al.，2016）.The main coal seams developed are classified as upper and lower coal groups as shown in Fig.2.The burial depth of coal increases from the east to the west，with the elevation of the coal show a relatively stable variation trend（Figs3a and b）.Moreover，the lower coal seams are thicker than the upper one，with a distance generally of 100 m between them（Figs.3c and d）.The coal roofs are generally composed of mudstones in the upper coal seam，whereas the roofs of the lower coal seams are mudstones limestones and also sandstones.The permeability varies broadly due to the faults and small structures that are extensively developed in the whole east margin of the Ordos Basin（Table 1）.