Reconstruction and petroleum geological significance of lithofacies paleogeography and paleokarst geomorphology of the Middle Permian Maokou Formation in northwestern Sichuan Basin, SW China

ZHONG Yuan,YANG Yueming,WEN Long,LUO Bing,XIAO Di,LI Minglong,CHEN Cong,ZHAO Like,LU Feifan,TAN Xiucheng

Fig. 11. Main types of sedimentary facies in the Maokou Formation of the northwestern Sichuan Basin. (a) Well ST9, 7396.0 m, LSC3, intra-platform high-energy shoal, sparry bioclastic limestone, plane-polarized light; (b) Well P1, 5876.1 m, LSC2, intra-platform low-energy shoal, micrite bioclastic limestone, plane-polarized light; (c) Changjianggou Section, LSC2, inter-shoal sea, bioclastic micrite limestone, plane-polarized light; (d) Changjianggou Section, LSC2, open sea, micrite limestone, plane-polarized light; (e) Changjianggou Section, LSC1, platform-margin high-energy shoal, flute coral, outcrop photo; (f) Zhengyuan Section, LSC2, platform margin high-energy shoal, fine dolomite, outcrop photo; (g) Changjianggou Section, LSC3, slope deposit, thin-layered bioclastic micrite limestone, outcrop photo; (h) Changjianggou Section, LSC3, slope, bioclastic micrite limestone, with some silicified bioclastics, outcrop photo; (i) Changjianggou Section, LSC3, shelf deposit, siliceous shale, radiolarian, plane-polarized light.