Abstract: The Distributive Passive Electromagnetic system is briefly called DPEM which utilizes passive-source-natural or cultural electromagnetic fields as the sources of the system to measure the electromagnetic responses of the earth and to determine the underground distribution of electric properties and to detect geological structures. It is flexible for complex geographic and geological environments. Its major features include synchronous array remote surveys for different geographic coordinates points with high signal to noise ratio, high resolution and good effectiveness.The system is unclosed and can be fitted with the subsystems(coordinate points)by requiring for synchronous area-covering survey. Its frequency range is 0～16kHz. Depth sounding for different geological targets at depths from near surface to 1 km and even up to upper mantle can be realized. Parameters of apparent resistivity, impedance phase, and anomaly phase can be acquired. Three field work examples are given in this paper.

Key words: Distributive Passive Electromagnetic System, Array remote survey, Apparent resistivity, Impedance phase, Anomaly phase

摘要： 分布式被动源电磁法系统,简称DPEM。DPEM利用天然电磁场或人文电磁场作为源场,研究大地的电磁响应,探测地下电性分布及地质结构,可适应各种复杂的地理地质环境。主要特点有:同步阵列遥测不同地理坐标点的电磁场,具有高信噪比、高分辨率和高效率;主机-子机系统,为非封闭挂接式,可按使用要求配置子机数量(坐标点数),一次实现面积性同步覆盖测量;频率范围16kHz～0Hz,实现浅自近地表、深至1km、直至上地幔的不同地质目标的探测;可提供视电阻率、阻抗相位、异常相位等地电学参数。文中介绍了3个工作实例。

关键词: 分布式被动源电磁法系统, 阵列遥测, 视电阻率, 阻抗相位, 异常相位