电极材质对天然电场选频法观测结果的影响试验研究

在当前的实际应用中,天然电场选频法电极的选择有多种,如不极化电极、铜电极、铁电极等。有人把选频法当成常规的自然电场法,选用不极化电极;有人认为是电磁类方法,选用铁电极或铜电极;选用不同材质的电极是否对勘探结果有影响,这是本文研究的主要问题。本文选择常用的铁电极、铜电极和不极化电极开展实地试验对比观测,首先在同一条测线、相同点位上开展不同电极观测试验;为进一步观测它们之间的区别,设计一放大器对测试信号进行放大,进一步开展重复的试验观测研究。试验获得了6m和20m极距情况下,三种不同电极的观测结果。通过对试验观测数据的对比分析可知,相同点位上三种不同电极的观测结果相同,说明三种电极的材质对观测结果无明显影响。因此,选频法在以后的野外工作中可根据工作实际选用施工方便的铜电极或铁电极即可。

Experimental Study on Influence of Observation Results of Electrode Materials for Natural Electric Field Frequency-selection Method

In the current practical application,there are many kinds of electrodes in natural electric field frequency-selection method,such as non-polarized electrode,copper electrode and iron electrode.Some prospectors regard the frequency-selection method as a conventional natural electric field method,so they choose non-polarized electrode in the fieldwork.However,others regard it as electromagnetic method,choosing copper electrode and iron electrode.The primary question of this paper research is whether electrodes with different materials could affect the exploration results or not.So the common iron,copper and non-polarized electrodes were selected to carry out field experiments used for contrast observation.Firstly,the different electrode observation experiments are carried out on the same point and same line.In order to observe the difference between them,an amplifier is designed to amplify the test signal for further observing study on the repeated experiments.The experiments gain three different kinds of electrodes result observed in case of the electrode spacing of 6m and 20m.Through the comparative analysis of the experiment data,the results of the three different electrodes at the same point are conforming,which shows that the material of the three kinds of electrodes has no obvious influence on the observed results.As a result,the frequency-selection method could be selected in the fieldwork,based on the actual working conditions to choose the copper electrode or iron electrode flexibly.