沁水盆地沁源地区煤层含气量分布规律及控气地质因素分析

Analysis of Distribution Characteristics and Controlling Geological Factors of Gas Content in Qinyuan Region of Qinshui Basin

本文通过对沁源地区进行详细地质研究,从多个角度归纳了该区两套煤层含气量特征的主控因素。结果表明,沁源地区煤层含气量主要受构造、煤层埋深、厚度、沉积共同控制,其次为顶底板岩性以及水文地质条件等。2号煤层含气情况受后期构造影响较大,而9+10号煤层含气性相对来说主要取决于其自身生气能力以及围岩结构特性的差异。综合分析认为,本区东南部为2号煤层下一步煤层气勘探的有利目标区;中部为9+10号煤层的有利目标区。

This paper induces the main controlling factors of the coal seam gas content from several angles based on the detailed geological research of the Qinyuan region.The results showed that the gas content of Qinyuan region is mainly affected by structure,coal seam buried depth,thickness and sedimentary,followed by the lithologic of roof and floor and hydrogeological conditions,etc.The gas bearing of No.2 coal seam is greatly influenced by the later tectonic movement,and yet the gas containing feature of No.9 and No.10 coal seams is greatly influenced by their gas generation capacity and the structural characteristics of surrounding rock.It is proposed that the southeast area of No.2 coal seam will be the favorable target area for coalbed methane exploration in the future,and the middle area is the favorable target area of No.9 and No.10 coal seam.