地质因素对土城矿瓦斯赋存的控制作用Control of Geological Factors on Gas Occurrence in Tucheng Mine
关金锋,周侃,司中应,成春莲,许国胜,王建华
摘要(Abstract):
根据矿区大地构造位置、构造演化和区域构造应力场的特点,分析了土城矿构造特征及其对煤层瓦斯的控制作用,发现土城矿处于盘江矿区“三角形弧系”构造应力场作用下的强变形区内,发育的NE向、NW向断裂构造是矿井瓦斯赋存和构造煤发育的控制因素,大中型断层控制着矿井瓦斯赋存与分布,而小型构造是煤与瓦斯突出的控制因素。土城矿井田西部发育的大中型断裂形成了煤层瓦斯运移和逸散的通道,不利于煤层瓦斯的保存,导致该区域煤层瓦斯含量相对低;井田东部的断裂构造不发育,煤层整体上保存较为完整,煤层瓦斯含量整体较高。小型断层附近瓦斯富集、构造煤发育,尤其在断层上盘、断层尖灭端与断层交汇的地段,煤体破坏严重,是煤与瓦斯突出事故易发地段。土城矿瓦斯防治工作应分区域实施,井田西部应关注煤层瓦斯含量随埋深增大而增加的规律并及时防范深部区域可能出现的瓦斯灾害,而井田东部则应在强化对隐伏断层探测基础上优先实施开采保护层和抽采煤层瓦斯等综合治理措施。
关键词(KeyWords): “三角形弧系”构造;矿井构造;瓦斯赋存;煤与瓦斯突出
基金项目(Foundation): 贵州省科技计划项目(黔科合支撑[2019]2876号);; 黔科合基础ZK[2022]一般165;; 高层次人才科学研究项目(院科合字G2018014号、G2018010号);; 贵州省青年科技人才成长项目(黔教合KY字[2022]128号);; 毕节市科学技术项目(毕科联合[2023]11号)
作者(Author): 关金锋,周侃,司中应,成春莲,许国胜,王建华
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