Application and research of geophysical logging:Taking Zhengshuangmiao Coal Mine as an example
Zhengshuangmiao Coal Mine is a late Paleozoic hidden coal-bearing stratum discovered earlier in eastern Henan Province.At present,with the continuous increase of mining depth and the unclear characteristics of deep coal seams,it seriously restricts the produc-tion and mining of mines.Based on this,theoretical research on geophysical logging in Zhengshuangmiao Coal Mine was conducted,which providing important basis for further mining of the coal mine.The research shows that the coal seam has a high resistivity,the am-plitude is concentrated in the range of 50-270 Ω·m,and the resistivity of surrounding rock and sandy mudstone is relatively low,con-centrated in the range of 10-80 Ω·m.In addition,the density of coal seam is relatively small,concentrated in the range of 1.33-1.75 g/cm3,and the density of surrounding rock is relatively large,concentrated in the range of 2.13-2.81 g/cm3.In general,the coal seam and surrounding rock have obvious physical property differences.Research has found that the definition of coal seam thickness can be analyzed based on the values of short source distance(GGNR)and three lateral resistivity(GR01).Coal seams of different thicknes-ses exhibit distinct parameter characteristics and can serve as important indicators for distinguishing coal seam thickness.On the geo-physical characteristic curves,the lateral resistivity value is lower than that of normal mudstone,and the gamma-gamma anomaly region with low density and high amplitude is an important sign of the fracture zone.
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