“…In recent years, the coal-bearing shale gas and CBM have been paid much attention in China (Luo et al., 2018; Yang et al., 2017) because of the coal measure gas (CBM, shale gas and sand gas) in superposed reservoirs existing a possibility of co-exploration and co-production. Significant production of continuous (unconventional) petroleum and gas resources has been explored and developed, such as Bowen and Surat basins in Australia (Towler et al., 2016), Alberta Basin in Canada (Bustin and Bustin, 2016), Fort Worth Basin and Piceance Basin in USA (Hawkins et al., 2016; Pollastro, 2007). In fact, transitional co-existing of coals and shales are distributed widely in China, such as the Carboniferous–Permian in the Qinshui Basin (Li et al., 2018b), Carboniferous Benxi Formation and the Lower Permian Shanxi Formation-Taiyuan Formation in the Ordos Basin (Tang et al., 2014) and the Permian Longtan Formation in southern China (Luo et al., 2018; Zhang et al., 2017).…”