摘要
本文较系统地研究了水平二层大地上偶极-偶极排列的电磁耦合(EM)相位频谱。认为影响二层大地EM谱性状的主要是电性参数μ2(相对导电率)和几何参数h1/a(盖层厚度/偶极距)。在底层为高阻的二层大地上,具较强的EM效应,此时EM仅反映浅层;当底层为低阻时,EM可反映较深部电性体的分布。通过EM频谱和反演的参数规律分析,得出EM特征的变化可直接指示地下介质电阻率值的改变。
Abstract
This paper makes a fairly systematic study of electromagnetic coupling (EM)phase frequency spectra of (lipole-dipole array in horizontal two-layered earth. It is considered that the electrical parameter (relative electric con ductivity) and geometric parameter h1/a(thickness of cover/dipole distance) are major factors affecting properties of EM in two-layered earth. The two-layered earth whose bottom layer has high resistance shows a rather strong EM effect, and such an EM effect only reflects the shallow layer; if the bot tom layer has low resistance, the EM effect reflects the distribution of com paratively-deep-seated electric bodies. An analysis of parameter regularity of EM frequency spectra and inversion shows that the variation in EM cha racteristics might directly indicate the variation in resistivity of underground media.
出处
《物探与化探》
CAS
CSCD
1991年第1期46-55,共10页
Geophysical and Geochemical Exploration
