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扬子地台北缘中二叠统孤峰组主要由黑色硅—泥质岩石组成,化石丰富,成藏条件较好,是我国页岩气勘探开发有利区带之一。通过对中二叠统孤峰组地层进行放射虫化石带和岩性地层对比,认为孤峰组由下至上可划分为3~4段:硅质泥岩段、泥质硅质岩段、硅质—钙质泥岩段和炭质泥岩段,部分地区缺失炭质泥岩段。通过对野外露头剖面实测和钻孔岩芯原始资料以及前人研究成果的收集,依照60条剖面和钻井资料探讨扬子北缘中二叠统孤峰组页岩的分布特征,并按岩性特征对孤峰组页岩空间分布做了进一步细分,绘制出该区孤峰组各段的岩性等厚图。为该层系页岩气资源评价和勘探开发打下了良好基础。
The northern Permian Gudong Formation in the northern margin of the Yangtze platform is mainly composed of black silicon-argillaceous rock with abundant fossils and good reservoir forming conditions, making it one of the favorable zones for exploration and development of shale gas in China. By comparing the radiolarian fossil belts and lithologic strata in the Gufeng Formation of the Middle Permian, it is concluded that the Gufeng Formation can be divided into 3 ~ 4 segments from bottom to top: siliceous mudstone, argillaceous silicalite, siliceous - Calcareous mudstone and carbonaceous mudstone, and a lack of carbonaceous mudstone in some areas. According to the data of field outcrop section and original data of drilling core and the collection of previous research results, the distribution characteristics of shale in the Middle Permian Cretaceous in the northern margin of the Yangtze are discussed in accordance with 60 profiles and drilling data. The spatial distribution of the shale in the Gushu Group is further subdivided, and the lithological isthmograms of each section of the Gushu Group in this area are drawn. This layer of shale gas resources evaluation and exploration and development has laid a good foundation.