《Table 5 The distribution of porosity and permeability of different layers in the study area》

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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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Several thick sandstone layers are developed in the study area，especially in the north part，which has a good tight gas development potential with some areas been verified in the Linxing area.In Taiyuan and Shanx formations，the Jinci，Qiaotou，and Beichagou sandstones are stably developed（Fig.9；Figs.4b and c），as well as the thick Luotuobozi sandstone bodies in the bottom of the Xiahihezi Formation（Fig.4a）.The sandstones acquired during well drilling were tested for helium porosity，with most of the porosity values varying between 0.35%and22.29%，averaged at 7.65%（Fig.10；Table 5）.Theaverage permeability of the samples is 0.72×10-3μm2，and quite a few samples being lower than 0.1×10-3μm2.The results show that the samples studied are generally tight sandstones，and same results have been reported by Li et al.（2016b）.