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
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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. 5. Backscatter SEM images of biogenic quartz in Wufeng-Longmaxi Formation shale. (a) Well W202, 2570.97 m, siliceous shale, with type I (red arrow) and type II quartz (white grains in the body cavity) on organic matter in the radiolarian body cavity; (b) Well W202, 2 570.97 m, siliceous shale, type II quartz "floating" on rod-shaped bacteria-like fossils (the red ellipse marks the typical area). |
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