Biostratigraphy and reservoir characteristics of the Ordovician Wufeng Formation-Silurian Longmaxi Formation shale in the Sichuan Basin and its surrounding areas, China

WANG Hongyan,SHI Zhensheng,SUN Shasha

Fig. 2. Characteristics of graptolite and brachiopod fossils in the Wufeng Formation of Sichuan Basin and its surrounding areas. (a) Appendispinograptus longispinus, Well JY1, WF2; (b) Dicellograptus ornatus, Wufeng Formation, Fenxiang, Yichang City, Hubei Province, WF2; (c) Dicellograptus ornatus, Wufeng Formation, Fenxiang, Yichang City, Hubei Province, WF2; (d) Tangyagraptus gracilis, WF3, Wufeng Formation, Fenxiang, Yichang City, Hubei Province; (e) Amplexograptus latus, Well JY1, WF2; (f) Paraorthograptus pacificus, Well YJ1, WF3; (g) Dicellograptus turgidus, Wudeng Formation, Ludiping, Songtao County, Guizhou Province, WF3; (h) Paraorthograptus pacificus, Wudeng Formation, Ludiping, Songtao County, Guizhou Province, WF3; (i) Tangyagraptus typicus, Well YJ1, WF3; (j) Strophomenid, Well W202, Guanyinqiao Formation; (k) Mucronaspis (Songxites) sp., Well W202, Guanyinqiao Formation; (l) Brachiopods, Well Z201, Guanyinqiao Formation.