甘肃环县西部地质构造及控煤作用

甘肃环县西部侏罗系下统延安组中赋存丰富的煤炭资源。通过探讨该区地层、构造的形成和演化过程,分析该区地质构造及其对煤层形成与赋存的控制作用,结果发现:本区煤系及煤层的分布规律受基底构造、同沉积构造及后期构造活动的改造等综合作用的控制与影响,该区煤系及煤层呈南北条带状分布于青龙山断褶带和沙井子断褶带的次级凹陷内,且分布范围和埋藏深度受断褶带内次级构造的控制,使煤系和煤层大致呈北部浅、南部深、东部浅、西部深的特点。因此,今后的找煤重点应放在沙井子、甜水堡、王洼和罗洼外围的青龙山断褶带和沙井子断褶带的次级凹陷内。

Geological structural and coal control pattern in the west of Huanxian,Gansu

In order to understand the geology structural and coal control pattern in the west of Huanxian,analysis on the formation and evolution process of strata and structure in the region was made.According to the analysis,it is known that the facts that act on the regularities of distribution of the coal measures strata and the coal seam in-clude basement structure,with the sedimentary structures of control and the transformation of post-tectonic activity and other facts.Acoordingly,in the future,the key areas wh...