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. 13. Large thin section photos of lamina interfaces of gas-bearing shale in Long-1 Member, Sichuan Basin. (a) Shuanghe outcrop, Long 111, silty laminae and clayey laminae are interbedded, and their interfaces are continuous, planar and parallel; (b) Shuanghe outcrop, Long 111, silty laminae and clayey laminae are interbedded, and their interfaces are continuous, planar and parallel; (c) Well Zu 201, 4365.8 m, silty laminae and clayey laminae are interbedded, and their interfaces are continuous, planar and parallel; (d) Well Zi-201, 3670.5 m, silty laminae and clayey laminae are interbedded, and their interfaces are continuous, planar and parallel; (e) Well Yanjin-1, 1534.6 m, silty laminae and clayey laminae are interbedded, and their interfaces are continuous, planar and parallel; (f) Well Wei-204, 3529.9 m, silty laminae and clayey laminae are interbedded, and their interfaces are continuous, planar and parallel.