庆阳沙井子矿区地质特征及成煤环境浅析

Analysis on Geological Characteristics and Coal-forming Environment of Shajingzi Mining Area in Qingyang

庆阳沙井子矿区蕴藏煤炭资源量50余亿吨,资源赋存条件优越,根据对本区地质构造特征、地层分布及岩相组合变化特征分析,在印支运动之后至燕山中期,地壳不均衡缓慢沉降控制着侏罗系沉积的全过程,在岩性和岩相组合上形成了多旋迴结构的延安组含煤岩系及资源量丰富的多层可采煤层。

The Shajingzi mining area in Qingyang contains more than 5 billion tons of coal resources with superior resource occurrence conditions.According to the analysis of the characteristics of geological structure,stratigraphic distribution and lithofacies assemblage in this area,from the Indosinian movement to the Middle Yanshan period,the crust unbalanced slow subsidence controls the whole process of Jurassic sedimentation,and the coal-bearing series of Yan'an formation with polycyclic structure and multi-layer exploitable coal seams with rich resources are formed in the combination of lithology and lithofacies.