中文摘要：

根据水平电流场源和垂直磁场源在半均匀空间地面的电磁场解析表达式,定义了广域视电阻率,建立1种新的频率域测深方法即广域电磁测深法。研究结果表明：采用广域电磁测深法可以在过渡带进行测量,即以较小的收发距探测到较大的深度;广域电磁法包括E-Ex广域电磁测深和E-Ez广域电磁测深等方式,每种方式各有其特点,而且都只测量1种物理量;广域电磁法与2n序列伪随机电法相结合还可以发展成2n序列伪随机信号-广域电磁法,不但探测深度大,而且效率高,广域电磁法可用于寻找火山岩油气藏、深部金属矿和工程电法勘探。

英文摘要：

Wide field apparent resistivity was defined from the analytical expressions of the horizontal electrical field source and the vertical magnetic field source on the surface of a homogeneous half space,and a new frequency domain sounding method,i.e. wide field electromagnetic sounding method was established. The results show that the method can be used to measure in transition zone,achieving a large penetration depth can be achieved with a small distance between transmitting and receiving. The method includes E-Ex,E-Ez and other arrangements,in which each method has its own characteristics,but a measurement of only one physical parameter is required. From the wide field electromagnetic sounding method,2n sequence pseudo-random signals-wide field electromagnetic sounding methods can be obtained with not only large penetration depth but also high efficiency. The wide field electromagnetic sounding method can be used to search for volcanic rock reservoirs and deep metal mines,and it can be used in engineering electrical exploration.