淮南矿区A组煤层底板灰岩钻孔瓦斯喷孔综合探查分析  

Comprehensive detection analysis on the reason of abnormal gas blow-out from the drilling hole through the floor limestone of A group coal seam in Huainan mining area

作　　者：黄晖[1] 蒋法文[1] 韩必武[1] 张平松[2] 

机构地区：[1]淮南矿业(集团)有限责任公司地质研究院,安徽淮南232001 [2]安徽理工大学地球与环境学院,安徽淮南232001

出　　处：《煤炭学报》2013年第11期1988-1992,共5页Journal of China Coal Society

基　　金：安徽省科技攻关计划资助项目(11010401015);淮南矿业集团科技创新计划资助项目

摘　　要：淮南潘谢矿区A组煤层开拓过程中,在巷道掘进施工钻孔中揭露灰岩发生瓦斯异常喷出现象,其瞬间涌出量大使得巷道掘进地质条件复杂。为查清喷出气体状况,采用地球物理与化学综合勘探方法对气体来源、储气空腔及导气通道等内容进行探查与判断。根据钻孔喷出气体成分及同位素测定,判断灰岩层中集气与A组煤气体不同源,即灰岩层段具有生贮气能力;物探查明在二灰和三灰岩层之间存在多处瓦斯贮气空腔或潜在的贮气空腔,在平面上大致沿轨道上山方位呈串珠状展布,且在三灰岩层中局部岩溶裂隙发育;连通试验表明1煤层底板各岩层之间连通性较好,且主要是通过煤层底板灰岩相连通,其岩溶及裂隙较发育。综合探查分析获取的成果得到后期施工钻孔证实。During the development of A group coal seam in Huainan mining area, the abnormal phenomenon of gas blow-out takes place in the drilling hole of the site disclosing limestone. Its amount of transient emission is great, and it leads to the complex extent increasing for the drivaging geology conditions. For investigating the characteristics of blow- out gas, the composite methods of geophysics and geochemistry were used to detect and judge the origin of gas, cavity of gas storage, and passageway of leading gas, and so on. According to the composition analysis and isotope assay for blow-out gas from drilling hole, the characteristic of different source for the gas from limestone seam and A group coal seam was gained, and it express that the limestone seam has the ability of producing and keeping gas. By the geophys- ics method detection, many practical or potential cavities of gas storage between 2 seam limestone and 3 seam lime- stone were interpreted, and its distributing form appears a string of beads spread in the plane along laneway of rail rise. The fracture of karst is more in the part of 3 seam limestone. Through the connected experiments, the good con- nectivity between different seams of the floor of No. 1 coal seam was proved, and the principal connective site is through the floor limestone of coal seam. The karst and fracture develops good in the floor limestone of coal seam. All of the comprehensive detecting results were verified by the drilling effect in later stage.

关 键 词：异常气体喷出 灰岩钻孔 A组煤层 淮南矿区 

分 类 号：P631.4[天文地球—地质矿产勘探] TD712[天文地球—地质学]