地质特征对煤层瓦斯赋存的影响分析

马桥北马庄勘查区的二叠系下统煤系地层中（埋深590～2 710 m），山西组（P₁s）含全区可采的二₂煤层（主要勘查对象），平均厚3.01 m；下石盒子组（P₁x）含大部可采的三₂煤层，平均厚1.69 m，均属高变质、特低硫煤为主的贫煤、无烟煤。由于该区煤岩层埋藏深、封闭性较好、瓦斯逸散条件差，致二₂、三煤层赋存有大量的瓦斯，且全区富集。就马桥北马庄勘查区地质特征对煤层瓦斯赋存的影响进行了剖析。研究发现，勘查区煤层瓦斯的赋存，不但受地质条件作用的主导，同时也受地质构造、水文地质条件等地质因素综合作用的制约。

Analysis on influencing of geological characteristics on occurrence of coal seam gas

In the northern part of Maqiao Permian coal exploration area of Mazhuang statistical coal strata （Burial depth of 590 ~ 2 710 m），Shanxi Formation （P₁s）containing the entire area can be taken the Ⅱ₂ coal seam（the main exploration target），the average thickness of about 3.01 m；Xiashihezi Formation （P₁x）contains most of the Ⅲ₂ recoverable coal seam，and the average thickness is about 1.69 m，belong to the high rank of lean coal and anthracite. Due to the deep buried depth of coal and rock in the region，which has better closing feature for gas and is not conductive for gas emission. So，there has a lot of coal seam gas，and occurrence in the entire area. In this paper，the influences of geological characteristics of coal exploration area in northern Maqiao of seam on gas occurrence were analyzed. Study finds，coal bed gas occurrence in exploration district，is affected not only by the dominant geological condition，but also influenced by the geological structure，hydrogeological conditions and so on.