EH4电磁成像系统在青羊厂铜矿勘查中的应用

Application Of EH4 Electromagnetic Imaging System In Qingyangchang Copper Mine Exploration

青羊厂铜矿矿体受构造破碎带控制,矿区找矿目标明确,地质体电性差异较大,适合开展电磁测深工作。通过在矿区使用EH4电磁成像系统进行物探勘查,了解了成矿构造破碎蚀变带的空间展布情况以及构造围岩的电阻率特征。仪器系统的野外布置规范合理,测量过程以张量观测模式进行。数据处理过程中对时间序列着重处理,优化了反演数据质量,选择TE模式成图减小了静态和地形影响。根据电性差异,推测了含矿构造破碎蚀变带的宽度及深部形态,对低阻破碎带进行钻孔验证,5个钻孔均取得了良好的找矿成果,推测的构造破碎带与矿体形态契合度较好。EH4电磁成像系统适合在构造控矿的矿山进行矿体勘查,能有效指导钻探工程的实施。

Qingyangchang copper ore body is controlled by the fracture zone,the target of prospecting in the mining area is clear,the resistivity of geological bodies is quite different,so it is suitable for electromagnetic sounding.By using EH4 electromagnetic imaging system for geophysical exploration in the mining area,the spatial distribution of the ore-forming fracture alteration zone and the resistivity characteristic of surrounding rock are understood.The field layout of the instrument system is standardized and reasonable,the measurement process is carried out in tensor observation mode.In the process of date processing,time series files are processed emphatically to optimize the quality of inversion date,selecting TE mode to produce the result map can reduce the static migration and terrain impact.According to the difference of resistivity,the width and deep shape of ore bearing fracture alteration zone are inferred.Through the driling engineering verification of the low resistivity fracture zone,the five dirll holes have achieved good prospecting result,and the inferred fracture zone is very similar to the shape of ore body.EH4 electromagnetic imaging system is suitable for ore body exploration in mines where fracture zone control the formation of ore bodies,this method can effectively guide the implementation of drilling engineering.