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国外广泛地采用低频电磁感应法来普查和勘探有色金属矿床已有25年以上的历史,并且有成效地解决了许多地质任务,累积了丰富的生产经验.国内目前仍处于试验阶段,尚未正式投入生产.本文简单地介绍我们一年来在低频电磁感应法试验工作中所取得的某些地质效果,供同志们参考.一、方法的实质众所周知,位于所建立的交变电磁场(一次场)中的良导性矿体,受激励产生感应电动势,在矿体中有涡流流动,并在其周围空间形成次生的电磁场(二次场).二次场的振幅和相位特征与一次场源的频率有关,而且还与产生異常场的地质体的电学性质以及几何形状有关.在实际工作中所观测的是二次场和一
Low-frequency electromagnetic induction is widely used abroad to survey and explore non-ferrous metal deposits for more than 25 years, effectively solving many geological tasks and accumulating rich experience in production. At present, China is still at the experimental stage and has not yet formally invested Production.This article briefly introduces some of the geological effects we have achieved in the work of low frequency electromagnetic induction test over the past year, for the comrades reference.One, the essence of the method is well known, is located in the established alternating electromagnetic field (a field) The good conductivity ore body is excited to produce the induced electromotive force and has vortex flow in the ore body and forms the secondary electromagnetic field (second field) in the surrounding space. The amplitude and phase characteristics of the second field and the frequency of the primary field source But also with the electrical properties and the geometry of the geological body that generates the anomalous field.It is observed in practical work that the secondary field and a