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Biostratigraphy and reservoir characteristics of the Ordovician Wufeng Formation-Silurian Longmaxi Formation shale in the Sichuan Basin and its surrounding areas, China
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WANG Hongyan,SHI Zhensheng,SUN Shasha
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Table 2 Mineral composition and TOC of graptolite zones in the Wufeng-Longmaxi Formation of Sichuan Basin and its surrounding areas.
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| Graptolite zone | Mineral content/% | TOC/% | | Quartz | Carbonate | Clay minerals | | LM9 | 40.3 | 26.7 | 22.6 | 1.6 | | LM6-LM8 | 45.3 | 14.5 | 26.9 | 1.6 | | LM5 | 46.2 | 14.9 | 23.7 | 1.9 | | LM4 | 55.9 | 13.9 | 20.2 | 3.3 | | LM2-LM3 | 58.3 | 28.7 | 15.9 | 3.1 | | LM1 | 64.9 | 21.0 | 9.7 | 5.2 | | WF4 | 26.9 | 25.1 | 35.6 | 2.9 | | WF2-WF3 | 37.8 | 36.6 | 16.7 | 3.2 |
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