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长宁页岩气田是中国页岩气勘探和开发最早的页岩气田之一。对长宁页岩气田宁211井钻井剖面的五峰组—龙马溪组黑色页岩开展了岩石地层及生物地层研究,建立了从上奥陶统凯迪阶上部的Dicellograptus complexus带(WF2带)至志留系兰多维列统埃隆阶顶部的Stimulograptus sedgwickii带(LM8带)的12个连续生物带和组合,这一生物地层序列可实现区域和全球的精确对比。通过岩石地层和和生物地层的对比,发现各岩石地层与生物带具有极强的耦合关系,宁211井主要目的层五峰组—龙马溪组龙一1亚段大致对应Dicellograptus complexus带(WF2带)-Coronograptus cyphus带(LM5带)。长宁页岩气田与长宁背斜及其周缘具有相同的沉积环境。
The Changning Shale Gas Field is one of the earliest shale gas fields in shale gas exploration and development in China. The lithostratigraphy and biostratigraphy of the black shale of the Wufeng Formation - Longmaxi Formation in the drilling section of Ning 211 well in the Changning shale gas field has been carried out. From the Dicellograptus complexus belt (WF2 belt) in the upper part of the Kaidi (Upper Ordovician) A series of 12 consecutive bands and assemblages of the Stimulograptus sedgwickii band (LM8 band) at the top of the Eldon stage of the Llandevillian, a biostratigraphic sequence that provides precise regional and global comparisons. Through the comparison of lithostratigraphy and biostratigraphy, it is found that there is a strong coupling relationship between the rock strata and the biozone. The main target strata of Ning 211 well correspond to Dicellograptus complexus (WF2 zone) -Cononograptus cyphus band (LM5 band). Changning shale gas field and the Changning anticline and its periphery have the same depositional environment.