Types of biogenic quartz and its coupling storage mechanism in organic-rich shales: A case study of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin, SW China |
GUAN Quanzhong,DONG Dazhong,ZHANG Hualing,SUN Shasha,ZHANG Surong,GUO Wen |
Fig. 7. Longitudinal distribution of biogenic silica in Wufeng-Longmaxi Formation, Sichuan Basin. |