许疃井田位于淮北煤田的最南部,面积约60km~2。井田全由第四系覆盖,其下伏含煤地层为一走向南北向东倾斜的单斜构造。4煤段位于下二叠统下石盒子组上部,厚70m。对穿过4煤段126个钻孔岩芯的野外鉴定及室内分析,划分出2个大相,23个微相,并作出了4煤段中较稳定发育的三层煤 Xu Yang minefield is located in the southernmost coal field in Huaibei, an area of ​​about 60km ~ 2. Minefield all covered by the Quaternary, the underlying coal-bearing strata to a north-south tilt to the east monocline structure. Section 4 is located in the Upper Permian Lower Shihezi Formation with a thickness of 70m. Field identification and laboratory analysis of 126 boreholes passing through section 4 of coal mine were divided into 2 major facies and 23 minor facies, and a more stable three-layer coal was developed in section 4