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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
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GUAN Quanzhong,DONG Dazhong,ZHANG Hualing,SUN Shasha,ZHANG Surong,GUO Wen
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Table 1 Parameters of biogenic silica in Wufeng-Longmaxi Formation shale, Sichuan Basin.
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| Gas field | Depositional
environment | Biogenic silica content/% | Average
content/% | Percentage of
biogenic silica/% | Thickness of high-
production section/m | Thickness of shale section rich in biogenic silica/m | | Weiyuan | Calcareous shale of deep-water shelf | 0-28.78 | 5.1 | 0.84-73.57 | 8.1 | 13 | | Changning | Calcareous shale of deep-water shelf | 0-28.90 | 5.1 | 8.83-83.03 | 12.4 | 18 | | Fuling | Siliceous shale of deep-water shelf | 0-32.60 | 13.3 | 0.50-91.30 | 30.0 | 38 |
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