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针对北山预选区基岩大量出露地表,近地表横向电性不均匀性较大这一情况,介绍了如何将EH4电磁系统应用于北山预选区的野外剖面测量,浅析了在戈壁滩这一特殊地理环境下野外数据采集中遇到的问题,对野外原始数据特性进行了初步讨论分析。研究表明,花岗岩体与围岩存在明显的电性差异,部分测点在频段1000～3000Hz掉频现象严重,部分测点在整理时要消除静态效应的影响,为野外施工及后期资料的处理提供了参考。
Aiming at the situation that a large amount of bedrock of Beishan pre-selected area is exposed and the horizontal electrical inhomogeneity near the surface is large, this paper introduces how EH4 electromagnetic system is applied to field profile measurement in Beishan preselected area. The problems encountered in the field data acquisition under special geographical environment, preliminary analysis of the characteristics of the original data in the field. The results show that there is a significant electrical difference between the granite body and the surrounding rock. Some of the measuring points have a serious frequency-dropping phenomenon in the frequency band of 1000-3000 Hz. Some measuring points eliminate the static effect during finishing and provide the information for the field construction and later data processing For reference.