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. 12. Main biological skeletons and gas-bearing shale in Long-1 Member, Sichuan Basin. (a) Well Zi-201, Long 111, many radiolaria skeletons are distributed along bed, single polarized light; (b) Well Wei-202, Long 111, radiolaria skeletons are filled with siliceous material, single polarized light; (c) Well Wei-204, Long 111, radiolaria skeletons are filled with organic matter, and a few are filled with pyrite, single polarized light; (d) Well Zu 201, Long 111, radiolaria skeletons are filled with siliceous material, single polarized light; (e) Shuanghe outcrop, Long 111, siliceous sponge spicules are distributed discontinuously in fusiform and filled with siliceous material, single polarized light; (f) Shuanghe outcrop, Long 111, siliceous sponge spicules are filled with siliceous material, single polarized light.