Microscopic pore-fracture configuration and gas-filled mechanism of shale reservoirs in the western Chongqing area, Sichuan Basin, China

FU Yonghong,JIANG Yuqiang,DONG Dazhong,HU Qinhong,LEI Zhi’an,PENG Hao,GU Yifan,MA Shaoguang,WANG Zimeng,YIN Xingping,WANG Zhanlei

Table 1 Statistics of SEM-based pores and micro-fractures in the first sub-layer in typical wells.

Well No. Organic pores proportion/% Inorganic pore proportion/% Micro-fracture proportion/% Z201 48.73 32.42 18.85 Z202 38.24 40.49 21.27 Z203 57.85 25.57 16.58 Z205 34.24 45.61 20.15 Z206 50.73 25.42 23.85 Z207 28.54 46.14 25.32 Z208 55.76 25.82 18.42