永陇矿区麟北区水文地质特征及其对煤层气的控制作用

Hydrogeological Characteristics and Its Control on CBM of Linbei District in Yonglong Mining Area

对麟北区水文地质特征进行了详细的论述,结合煤层实测含气性特征,探讨了水文地质条件对该区煤层气成藏的控制作用。研究表明:研究区构造简单,延安组煤系含水层与其他含水层不具明显水力联系,有利于煤层气富集成藏;矿区划分为两个水动力强弱不同的区域:侧向径流区和相对滞流区,其中位于矿区西北部的相对滞流区,也是水势低洼带煤层气汇集区,有利于煤层的富集成藏。同时,西北部煤层的含气量相对最高,说明该区水文地质条件确实对煤层气成藏起着关健作用。

bined with This paper describes in details the hydrogeological characteristics of Linbei District. Com- the actual gas-bearing characteristics of the coal seams, it discusses the function of hydrogeol- ogy conditions in controlling the CBM occurrence in this area. Research shows that, the structure in the studies area is simple, and the aquifers in the coal bearing measures of Yan＇ an Formation has no ap- parent connection with other aquifer in the coal bearing measures, which is good for CBM enrichment. The mining area could be divided into two areas with different hydrodynamic intensity, including the lat- eral runoff area and the relatively stagnant area. The relatively stagnant area, located in the northwest of the Mining Area, also is the water low-lying area and CBM collection zone, and is advantageous to the coal seam enrichment. At the same time, the gas content in the northwest coal seams is relatively high, which means the the hydrogeological conditions plays a key role in the CBM enrichment in this area.