永城煤矿位于淮河冲积平原北部永城县境内。井田面积近10平方公里,开采山西组二_2煤。煤层埋深180～360米,上部新生界复盖层厚163～181米,平均167米。井田地质构造为一走向北北东的狭长的背斜。在其北翼16～18线背斜轴部,新生界底部局部透镜体状砂层呈“天窗”直接与基岩接触,与基岩造成水力联系。河南省煤矿设计院1984年11月提交的本矿改扩建初步设计,在“天窗” Yongcheng mine is located in the Huaihe River alluvial plain in the northern Yongcheng County. Minefield area of ​​nearly 10 square kilometers, the mining group two _2 Shanxi coal. Depth of coal seam 180 ~ 360 meters, the upper Cenozoic cover layer 163 ~ 181 meters thick, an average of 167 meters. Minefield geological structure is a narrow north-south anticline. In the northwestern 16 ~ 18 line anticline axis, the sand body of the partial lens sand body at the bottom of the Cenozoic appears as a “skylight” which directly contacts the bedrock and causes hydraulic contact with bedrock. Coal Mine Design Institute of Henan Province in November 1984 to submit the preliminary design of the mine renovation and expansion, in the “skylight”