摘要
根据煤矿井下煤层瓦斯参数测定结果,以瓦斯地质理论为基础,分析了呼鲁斯太矿区瓦斯分布规律及其控制因素。结果表明:矿区煤层瓦斯区域分布具有不均衡性,以F2-2和F22断层为界将矿区划分为北部、中部、南部三个区域,中部煤层瓦斯压力、瓦斯含量最高,北部次之,南部最低;煤变质程度较高和围岩封闭性较好是矿区瓦斯富集的根本条件,而构造复杂程度的不同、构造线方向的改变是瓦斯分布不均的主控因素。矿区中部为北北东向构造向东西向构造转折区,应力集中,且顶板为泥岩,煤变质程度较高,形成较好的瓦斯生储条件;南部北北东向推覆构造较为强烈,使煤层沿倾向切割,断层连通地表,造成瓦斯大量逸散。
On the bases of coalmine underground gas parameter tested results and gas geology theory, analyzed coal gas distribution pat-tern and its controlling factors in the Holstay mine area. The resultshave shown that the mine area gas regional distribution is dispropor-tion. Taking the faults F2-2and F22 as boundaries, divided the mine area into north, middle and south three zones; coal seams in the mid-dle zone have highest gas pressure and gas content, north zone the second, south zone lowest. High degree of coal metamorphism andgood enclosing rock sealing are essential conditions for gas enrichment; while different structural complexities and structural line trendchanges are main controlling factors of gas distribution disproportion. The middle zone is the turning interval of structural trend fromNNE into EW, stress concentrated, coal roof is mudstone and high degree of coal metamorphism thus formed rather good gas generationand storage conditions; south zone has stronger NNE nappe structures made the coal seams dissected along the dip, then again, faults outcropped and brought about large amount gas dissipated.
出处
《中国煤炭地质》
2014年第9期27-30,共4页
Coal Geology of China
关键词
呼鲁斯太矿区
瓦斯分布
煤变质
构造
Holstay mine area
gas distribution
coal metamorphism
structure
