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江西省冷水坑矿集区具有浅部斑岩型矿体与深部层控叠生型矿体的复杂组合.利用现代地球物理方法对矿集区地下深部结构进行了探测,对圈定地下容矿、示矿地质信息和认识地下深部成矿过程具有重要意义.本文以位于江西省贵溪市境内的冷水坑银铅锌矿田为试验研究区,开展了混场源音频大地电磁测深法(EH4)、音频大地电磁测深法(AMT)以及可控源音频大地电磁测深法(CSAMT)三种不同频率域的探测试验,研究和总结了频率域方法以及不同仪器电磁法数据采集特点和应用效果,为频率域电磁法勘探提供借鉴和参考.通过对冷水坑矿集区典型勘探线上三种电磁方法的数据处理,绘制了视电阻率和相位单点测深曲线、原始拟断面及二维反演断面图.发现单点曲线形态基本一样.由于AMT在低频段受矿区工业干扰,视电阻率曲线呈45°上升;视电阻率、相位拟断面对地下电性分层结构基本一样,总体可分为三层,且分层结构较清晰;二维反演断面能够较好反映地下高低阻异常响应,但响应效果有所差异且CSAMT法效果较好.因此在干扰严重地区,建议选用人工源发射的可控源音频大地电磁测深法(CSAMT).
The cold water pits in Jiangxi Province have a complex combination of shallow porphyry-type orebodies and deep-bedded stratigraphic-hosted orebodies.The modern geophysical methods are used to detect the deep underground structures in the ore-gathering areas, It is of great importance to show the geological information of the mine and understand the deep underground metallogenic process.In this paper, Lengshuikeng Ag-Pb-Zn ore field located in Guixi City of Jiangxi Province is taken as the experimental study area, ), Electromagnetic temperture measurement (AMT), and controllable source audiometry (CSAMT) in three different frequency ranges, the frequency domain method and the characteristics and applications of the electromagnetic data acquisition of different instruments are studied and summarized And provide reference and reference for the electromagnetic exploration in the frequency domain.According to the data processing of the three electromagnetic methods in the typical exploration line of cold water pits, the apparent resistivity and phase single point sounding curves, the original quasi-section and the second Dimensional inversion of the profile.It is found that the single point curve shape is basically the same.As the AMT in the low frequency band affected by the industrial interference in the mining area, the apparent resistivity curve showed a 45 ° rise; apparent resistivity, The structure is basically the same, the overall can be divided into three layers, and the layered structure is clearer; two-dimensional inversion section can better reflect the underground high and low resistance anomalous response, but the response effect is different and the CSAMT method is better .Therefore, Region, it is recommended to use artificial source-controlled ground-source electromagnetic sounding method (CSAMT).