影响离柳矿区瓦斯赋存的地质因素研究

Geological Factors of Gas Occurrence in Liliu Mine

应用地质、瓦斯地质等相关理论,采用数学统计、相关性分析法对离柳矿区煤层埋深、盖层厚度、围岩性质、地质构造及地下水动力条件等地质因素对煤层瓦斯控制作用进行了研究。结果表明:煤层埋深越大,煤层"压实"效果越显著,同时加大了煤层瓦斯纵向运移难度,利于煤层瓦斯的保存,进而表现为煤层瓦斯含量亦越高;盖层和围岩对煤层瓦斯具有"封存"作用,二者对煤层瓦斯的控制作用显著,呈正相关性;地质构造影响着煤层瓦斯赋存的不均衡性;地下水水动力条件弱,径流条件差,基本呈滞留状态,利于煤层瓦斯的保存和富集。研究结果对提高研究区瓦斯地质研究程度和瓦斯防治水平具有重要意义。

With geology, gas geology, and other related theories, mathematical statistics and correlation analysis were used to study the control effects of some geological factors on coalbed methane （CBM）, including the buried depth of coal seam, the thickness of cover coat, surrounding rock features, tectonics, and groundwater conditions. The results show that the greater the buried depth is, the more remarkable effect of compaction of the coal seams and the more difficulty of vertical movement of CBM among the coal seams, which facilitates the gas preservation and then increases gas content. The cover coat and surrounding rock could seal the CBM and their control effects on the CBM are positively correlated. The tectonics affects the imbalance of the CBM occurrence. Underground water is basically in a retention state due to weak hydrodynamic condition and poor runoff condition, which is beneficial for the conservation and enrichment of CBM. The study is of importance to improve gas geology study and gas control in the region.