【作者】 汪雄友；

【导师】 严家平；

【作者基本信息】 安徽理工大学 ， 地质工程， 2011， 硕士

【摘要】 据丰城矿区井田主采B4煤层勘探期间、生产期间测定的煤层瓦斯含量数据和现场调查,综合分析影响研究区瓦斯赋存的地质因素,搞清本区煤层瓦斯含量的分布趋势,取得一定研究成果,表现在以下几个方面：(1)结合研究区勘探钻孔B4煤层埋深、瓦斯含量点资料和瓦斯含量等值线图,分析引起矿区东部曲江向斜南部煤层瓦斯含量低是：煤层在区域构造运动作用下地层抬升并不断受剥蚀,加之本区断层一般均为张扭性开放性断层是形成本区煤层瓦斯埋深大但瓦斯含量低的“锅底无肉”现象的根本原因。(2)地质构造对本区B4煤层瓦斯赋存和发育程度起到主控因素作用。采用断裂复杂程度综合系数对研究区内断层、褶皱、煤层倾角等相关参数进行综合评价,然后结合矿区瓦斯含量、煤与瓦斯突出等基础资料对丰城矿区南部B4煤层进行矿区瓦斯单元划分。划分结果表明：本区共分为5个瓦斯地质单元,Ⅱ区和Ⅲ区属低瓦斯含量区、Ⅰ区和Ⅳ区属高瓦斯含量区、Ⅴ区属一般瓦斯含量区。控制本区瓦斯赋存的主要因素是曲江向斜、牛坊村背斜和一系列开放型张扭性、封闭性压扭性中小型和密集型小断层。(3)针对研究区内不同瓦斯地质单元内影响煤层瓦斯赋存和分布、对煤与瓦斯突出起重要作用的相关地质因素进行分析和探讨造成研究区瓦斯赋存密集、煤与瓦斯突出强度大、突出点密集的主要因素,为矿井瓦斯地质灾害防治工作的指导具有重要意义。(4)将影响本区煤层瓦斯赋存和分布的顶底板岩性、煤层埋深、煤变质程度、上覆基岩厚度等重要因素进行综合分析,其结果表明本区：研究区总体上煤层瓦斯含量随埋深的增加、顶底板岩性的封闭性的密实和增厚、挥发分的减小而增大,瓦斯含量呈现出明显的由南向北、自东往西逐渐增大的趋势。更多还原

【Abstract】 According the gas content of and research data measured during proving and production of B4 mine seam in Fengcheng Coal Field, comprehensive analysis of the geological factors of gas occurrence in the study area, finding out distribution of gas content trends in this area the, some research results was made out. It performed in the following four aspects:(1) Combined the coal seam depth with the gas content contour map of B4 coal in the study area exploration, the reason of the reducing gas content in the southern of syncline in eastern Qujiang:the coal seam in the area uplift and constantly subject to erosion under the tectonic, and the faults in this area are generally open faults; these are the ultimate reason of low gas content in the deep coal seam in this area.(2) Geological structure plays a leading role in gas occurrence and growth degree of B4 mine seam. The break complexity coefficient was used to comprehensively evaluate the faults, folds, seam dip, and other related parameters in the study area, then combined with mine gas content, coal and gas outburst and other basic information to divide B4 coal seam in the Fengcheng coal mine. The results show that:this area is divided into five gas geological unit, II and III area belong to the low gas content, I and IV area belong to the high gas content area, V belongs to the normal gas content area. The main factors of gas occurrence in this area are Qujiang syncline, Niufang county anticline and a series of opening, tensor-shear,closeing,compresso-shear and intensive small and medium pressure shear small faults.(3) According to gas occurrence and distribution, the main geological factors of gas outburst in the different geological units, the factors of dense gas occurrence, high intensity outstanding and dense outstanding point are analysed and explored. It is of great significance to guide coal gas hazard prevention and control.(4) Comprehensively analysing the factors of gas occurrence and distribution of coal seam rock property, coal depth, coal metamorphism, the thickness of the overlying rock and other important factors, the results indicate that:the gas content in the study area is wholly increasing as the coal seam depth increasing, the sealing properties of the top floor rock densification and incrassation and the vdaf reduce; the gas content shows a significant gradually increasing trend from south to north, from east to west.更多还原