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以沁水盆地南部寺河矿区3#煤层为研究对象,对研究工区内的井间瓦斯含气量差异及影响因素进行了分析。结果表明,造成井间含气量差异的主要因素有构造发育、煤层厚度、埋深及煤岩结构。埋深与煤岩结构是造成单井含气量差异的最直接影响因素,共同决定了煤层的含气性。地层压力越大,煤层密度越低,煤层气含量越高。
Taking the No.3 coal seam in Sihe mining area in the south of Qinshui Basin as the research object, this paper analyzes the differences of gas content in wellbore between wells and the influencing factors. The results show that the main factors causing the difference in gas volume between wells are tectonic development, coal seam thickness, burial depth and coal-rock structure. Buried depth and coal-rock structure are the most direct influencing factors for the difference of single-well gas content, and jointly determine the gas-bearing property of coal seam. The greater the formation pressure, the lower the coal seam density, the higher the CBM content.