利国煤矿区位于徐州煤田北部,为一单斜构造,走向长11公里,倾向宽1.5公里。矿区从东至西分布利国煤矿、红卫煤矿及殷庄煤矿。西部微山湖水域尚在勘探中。 利国矿区含煤地层为石炭二叠系,共含五层可采煤层,其中山西组七煤分布最广,厚度最大。七煤为滨海平原三角洲沉积。煤层沉积后,本区三角洲分支河道发育,使七煤受到不同程度冲刷。矿区内出现大小不等的扇状冲刷块段,中粗粒砂岩取代了煤层原 Liuguo Coal Mine is located in the northern part of Xuzhou coalfield, a monocline structure, the direction of 11 km long and 1.5 km wide. Mining area from east to west distribution Li country coal mine, Hongwei coal mine and Yinzhuang coal mine. Western Weishan Lake waters are still under exploration. The coal-bearing strata of Liuguo Mine are Permo-Carboniferous, with a total of five layers of recoverable seams, of which the seven groups in Shanxi are the most widely distributed and the largest in thickness. Seven coal deposits for the coastal plains delta. After the coal seams were deposited, the rivers in the delta branch in the area developed so that the seven coal beds were washed at different degrees. There are fan-shaped scouring blocks of different sizes in the mining area, and coarse-grained sandstone replaces the original coal seam