宁夏彭阳县草庙地区地质特征及控煤作用研究

Research on geological characteristics and coal control pattern in Caomiao area in Ningxia

通过对草庙地区沉积地层和构造的分析,认为研究区煤系地层为辫状河和曲流河的泛滥盆地沉积,煤层的分布受古地形和古河道影响。成煤期研究区处于伸展拗陷环境,构造变形较弱,但构造活动使得煤层呈南北向条带状分布,并控制煤层沉积的厚度变化;后期构造活动先以挤压为主,形成复式向斜的主体构造;后以逆冲推覆为主,造成主断裂上盘煤层被剥蚀。推断杨咀子湾向斜东翼煤系地层褶皱隆起,具有一定找煤前景。

By analyzing the sedimentary strata and structure of Caomiao area,the authors found that the coal measure strata in the area was flood basin sediment with braided river and meandering river,and the coal seam distribution was influenced by paleotopography and palaeochannels.In coal-forming stage,the research area was in extensional and depressing condition,and tectonic deformation was weak.But the tectonic action made the coal seam be a north-south stripped distribution,and controlled the thickness change of coal seam sediment.In later stage,the tectonic deformation was dominated by extruding actions,which caused the multiple synclinal structure;then the tectonic deformation was mainly dominated by thrust nappe,which caused the coal seam denudation.At last,the authors inferred that the coal measures strata was folded in the east wing of Yangzuiziwan syncline,so there might be a good prospect for finding coal resources.