Reservoir characteristics and genetic mechanisms of gas-bearing shales with different laminae and laminae combinations: A case study of Member 1 of the Lower Silurian Longmaxi shale in Sichuan Basin, SW China

SHI Zhensheng,DONG Dazhong,WANG Hongyan,SUN Shasha,WU Jin

Fig. 10 SEM photos showing micro-fracture types and filling of gas-bearing shale in Long-1 Member, Sichuan Basin. (a) Shuanghe outcrop, Long 111, bed-parallel fractures; (b) Shuanghe outcrop, Long 111, non-parallel fractures; (c) Well Lu 205, Long 111, bed-parallel fractures and non-parallel fractures intersect mutually, filled with calcite; (d) Well Lu 205, Long 114, micro-fractures are filled with calcite; (e) Well Wei-201, 1542.5 m; non-parallel fractures are filled with organic matter; (f) Well Wei-202, 2573.5 m, micro-fractures are filled with siliceous matter.