瞬变电磁法与高密度电法综合对比分析——以近地表工程勘探为例

Comprehensive comparative analysis of transient electromagnetic method and high density electrical method——Case study of near-surface engineering exploration

瞬变电磁法和高密度电阻法是解决浅部工程地质问题的重要地球物理勘探方法,但对其应用效果和探测能力等方面缺乏综合对比分析。为此,本文以成都温江商业用地、拉马风电场工程勘探为例,分别从瞬变电磁法和高密度电法的野外工作方法以及视电阻率、反演剖面图、工程地质探测效果等方面进行综合对比分析,结果表明:瞬变电磁法和高密度电法同一视深度的视电阻率值大小不同,但曲线类型和形态基本一致;在反演色谱图上电阻率分布特征和探测效应基本类似,但瞬变电磁法对低阻体分辨率更好,高密度电阻率法受体积效应影响异常影响范围更大。

The transient electromagnetic method (TEM) and the high-density resistance method are the important geophysical exploration methods to solve the shallow engineering geological problems, but there is a lack of comprehensive comparative analysis on their application effect and detection ability. Therefore, this paper took Chengdu Wenjiang commercial land and Lama wind farm engineering exploration as two examples, it was carried out that comprehensive comparative analysis between transient electromagnetic method and high-density electric method for the measure methods, apparent resistivity, inversion, exploration effect, etc. The results shows that the apparent resistivity values of the same depth are different but the curves are basically similar;the resistivity distribution characteristics and the detection effect are basically similar on the inversion chromatogram. But the transient electromagnetic method has better definition for the low-resistance body, and the high-density resistivity method is more affected for the low-resistance body.