纳林河矿区瓦斯地质分析及溯源

Gas Geological Analysis and Tracing of Nalinhe Mining area

纳林河矿区瓦斯地质分析与煤层瓦斯赋存情况存在偏差,对矿井施工人员安全造成了威胁。以纳林河二号矿为研究对象,通过理论分析、现场实测等手段,探讨采空区温度、天然气井、采掘工作面瓦斯含量和采动等因素对瓦斯浓度的影响。研究发现:1)采空区温度稳定,不会造成瓦斯解吸,与瓦斯浓度升高无关;2)采掘工作面无天然气标志性气体,瓦斯浓度高与天然气井无必然关系;3)3-1煤、4-1煤北翼钻孔煤样中瓦斯含量明显高于南翼,同时3-1煤与4-1煤构成保护层与被保护层关系,表明北翼工作面瓦斯含量偏高的主要原因是煤体瓦斯含量偏高,次要原因是采动导致4-1煤瓦斯扩散进入3-1煤采空区。为后期纳林河矿区其他矿井开采时的瓦斯事故安全预防提供了依据。

The gas geological analysis in Nalinhe mining area is not in line with the gas occurrence of local coal seam,which poses a threat to the safety of mine construction personnel.Taking No.2 mine of Nalinhe mining area as the research object,the influences of goaf temperature,natural gas well,gas content of mining surface and mining induction on the gas concentration are discussed by means of theoretical analysis and field measurement.The results show that:1)the goaf temperature is stable,which will not cause gas desorption,and has nothing to do with the increase of gas concentration;2)there is no representative gas of natural gas in the mining surface,thus the high gas concentration has no inevitable relationship with the natural gas well;3)the gas content in the boreholes in the north wing of 3-1 coal seam and 4-1 coal seam is significantly higher than that in the south wing,and 3-1 coal and 4-1 coal constitute the relationship of protective layer and protected layer,indicating that the main reason for the high gas content in the north wing is the high gas content in the coal body,and the secondary reason is that 4-1 coal gas diffuses into 3-1 goaf due to mining induction.It provides a basis for gas accident safety prevention and control of other mines in the later period of Nalinhe mining area.