摘要
Tridem航空电磁系统作为一种快速、高效、经济的地质普查勘测工具,在河北省南宫盐碱化地区用于寻找浅层地下淡水的试验测量中,获得明显地质效果。实测电磁响应和反演视电阻率在不同的咸淡水分布区段显示出明显的电性异常特征。在已知的地下淡水库区,电磁响应显示为虚分量(Im)≥实分量(Re)变化;视电阻率呈现ρ>25Ω·m的高阻特征。本文还对原始电磁响应零水平改正和反演电阻率方法作了粗浅的探讨和改进。
Tridem airborne electromagnetic (EM) system, as a method of fast, efficient and economic geologic reconnaissance,
has been used in a test survey to find out shallow underground fresh water and has had a considerable geologic effect in
the salted area of Nangong county, Hebei province. Both real survey EM responses and calculating resistivities show a
clear anomaly of electricity in different regions containing underground either salt water or fresh water. In the know un-
derground fresh water reservoir, the out-of-phase (Im) components of the EM responses are larger than or close equal to
the in-phase (Re) components; the apparent resistivities are larger than 25Ωm. Meanwhile, the author has made some ap-
proaches and improvements to the zero-level correction method of the original EM responses and calculating resistivity
method under the condition that exploring target are changed.
关键词
航空电磁系统
盐碱
地下水
淡水
Tridem airborne electromagnetic system
salinization
fresh-water
underground palaeostream
zero-level correction
