坦家冲、里王庙矿井深部煤层气资源特征

Features of Coal Bed Gas Resources in Deep of Tanjiachong and Liwangmiao Mine

红卫煤矿坦家冲、里王庙井是湖南省瓦斯突出严重的矿井之一,主要开采龙潭组上段6煤层。在水平挤压应力作用下,煤体自上而下形成块状、鳞片状、粉未状“三层结构”,呈透镜壮或藕节状“煤包”形式赋存。煤与瓦斯突出,特别是大型突出多发生在“煤包”底部及其“煤刺”处。矿井历年绝对甲烷涌出量245～1798m3/min,用钻孔甲烷平均含量计算,全区获资源量53152万m3。1962—1994年两矿井共抽放瓦斯227万m3,属于勉强抽放和较难抽放范围,因此建议采用深孔松动爆破卸压抽放方式。

In Tanjiachong and Liwangmiao mine o f Hongwei coal mine,primarily explo ited No.6coal bed of upper member in Longtan formation.Because of horiz ontal extruding stress make coal formed lump shape、scale shape、powder shape(3layers of structure),and the coal -bed preserved in form a s“coal swelling”like lens shape or in shape like joint s of a lotus root.Most of gas inrush occurred in the bottom of“coal swelling”、Absolute overflow of gas in mine over the years 2.45～17.98m 3 /min,and ac-cording to drilling informations co unted gas reserve of whole region 39million m 3 /km 2 .During 1962～1994,the total amount of gas pump 2273m 3 in the 2mines,so belongs to more difficult gas pump type,so suggest that t o adopt pump pattern in deep well blast and discharge of pressure.