内蒙古呼山盆地北东段含煤地层及煤层特征

Coal-bearing Strata and Coal Seam Characteristics in Northeastern Hushan Coal Basin,Inner Mongolia

内蒙古呼山盆地北东段勘查区位于海拉尔中新生代凹陷,含煤地层主要为白垩纪伊敏组。根据勘查区已有的地质资料及最新的详查成果,认为勘查区总体构造形态为一复式向斜,地层产状平缓,构造中等;根据岩性特征伊敏组分为下、中、上三段,可采煤层主要集中在上段和下段,煤层厚度变化大,在同沉积向斜轴部煤层厚度大、向两翼及盆地边缘逐渐变薄直至尖灭,其中煤3~4厚度大,为大部可采的较稳定煤层。该区煤炭资源丰富,经估算煤炭资源总量为228 390万t,适宜规划设计大型、特大型机械化开采矿井,具备建设大型煤电和煤化工能源基地的条件。

The northeastern sector exploration area, Hushan coal basin, Inner Mongolia is situated in the Hailar Mesozoic-Cenozoic depression; coal-bearing strata mainly belong to Cretaceous Yimin Formation. According to available geological data and new preliminary exploration result, considered that the total structural form is a composite syncline with gentle strata occurrence and medium structural complexity; based on the lithologic features, the Yimin Formation can be divided into lower, middle and upper 3 members, mineable coal seams are mainly concentrated in upper and lower members, with variable seam thickness. Coal seam thickness is large in the synsedimentary syncline axis, thinning even thin out toward two limbs and basin margin, in which the coal seam No.3-4 has larger thickness and mostly mineable, thus a stable coal seam. The coal resource is abundant in the area, estimated total coal resource is 2.2839 billion tons, adapted for large and extra large typed mechanical mining, and met the requirements for large type coal power and coal chemical energy base.