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江西省上二迭统龙潭组主要集中分布于萍乐坳陷带内,以坳陷带的中部含煤性最好,其主要含煤段为下老山亚段。 区内下老山亚段为过渡相沉积,下伏灰白色长石石英砂岩(即官山段的顶层,三角洲相),上覆含菊石的灰黑色细粉砂岩(即中老山亚段、浅海海湾相)。上、下界面清楚、易认,这为本区使用岩比法研究聚煤规
The Upper Second Permian Longtan Formation in Jiangxi Province is mainly distributed in the Pingle Depression, with the middle part of the depression belt containing the best coal and the main coal-bearing section being the Xia-Laoshan section. The Lower Xiaoshan section of the area is transitional facies sedimentary. The underlying volcanic feldspar quartz sandstone (ie, the top and delta facies of Guanshan section), the gray-black fine siltstone overlying with ammonite (ie, the middle Laoshan section, Shallow sea bay phase). The upper and lower interfaces are clear and easy to recognize, which is the study of the coal measures by using the rock ratio method in this area