In No. 2 Coal Mine of Pingdingshan, the sedimentary environment of the lower stratum of Shanxi formation is considered as the tidal plat and the upper stratum and the result of delta systems.
平顶山二矿含煤地层山西组下部地层的沉积环境为潮坪，上部是三角洲体系的产物。
Southwestern Hubei area belongs to upper Yangtze subarea of Yangtze stratum area, the late Permian stratigraphic rock combination type is various.
鄂西南地区在地层区划上归属扬子地层区之上扬子分区，晚二叠世地层岩石组合类型多样。
Introducing into air drilling, nitrogen drilling and air percussion drilling were applied in Puguang upper continental facies stratum; moreover, drilled successfully into Xujiahe group stratum.
引进空气钻井、氮气钻井、空气锤冲击钻井在普光气田上部陆相地层试验和应用，并成功拓展到须家河组地层。
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