宁夏盐池县萌城矿区含煤地层赋存特征探析

萌城矿区位于宁东煤田的最南端，区内由一系列走向NNW或近SN向的褶皱群及与之相伴的断层组成。通过分析各个勘查区的地质特征，总结了矿区构造特征和含煤地层赋存规律：成煤后期的构造控制了本区含煤地层的赋存；延安组呈南北狭长带状分布存向斜及背斜与断层之间相对凹陷的区域内；含煤地层自北而南不仅赋存面积变小，而且含煤性变筹。位于矿区中部的叶庄子小－沙湾子向斜是萌城矿区含煤面积最大的赋煤构造，含煤面积约56km^2。

Probe into Coal-bearing Strata Hosting Features in Mengcheng Mine Area,Yanchi County,Ningxia

The Mengcheng mine area is situated at the south end of the Ningdong coalfield, and composed by a series of NNW or near NS fold groups and associated faults. Analyzed geological features of each exploration area summed up mine area structural characteristics and coal-bearing strata hosting pattern. It is concluded that the post coal-forming stage structures have controlled coal-bearing strata hosting in the area; the Yanan Formation distributed in relatively depressed areas between synclines, anticlines and faults and presented NS trend long and narrow zonal distribution; from north to south the coal-bearing strata not only lessening their hosting areas, hut also worsening their coal-bearing properties. The Yezhuangzi- Xiaoshawanzi syncline is the coal-hosting structure with largest coal-bearing area in Mengcheng mine area, its coal-bearing area is about 56km^2.