摘要
讨论了水平多层介质表面垂直磁偶源频率测深中电场水平分量、磁场水平分量和垂直分量定义的等效电阻率及其算法。对渐近特性的分析表明，在波区条件下，各场分量等效电阻率分别收敛于各自的波区视电阻率；在近区条件下，它们分别收敛于用近区公式计算的视电阻率或不同的水平渐近线。对均匀大地，此渐近线值即为大地真电阻率；对复杂的地电断面，此渐近线值由收发距和地电参数决定。在中间区，随电距离的减小，各场分量等效电阻率自适应、均匀地从波区特性变化到近区特性，从而改善了视电阻率随频率的变化关系曲线，消除了波区视电阻率在中间区和近区的畸变，较客观地反映了地电断面的电性变化规律。
The definition of effective resistivities used in electromagnetic sounding induced by verti-cal magnetic dipole on horizontal layered earth and Its algorithms are discussed．Theoreticalanalvsis shows that the effective resistivities possess reasonable characteristics and displaywell in all areas of electromagnetic soundIng. So it can correct the so-called non-plane-waveeffect well in frequency domain electromagnetic sounding．A great deal of application showsthe dif1nition and algorithm of the effective resistivity are valid and feasible.
基金
美国国家自然科学基金
中国国家自然科学基金
关键词
等效电阻率
地球物理勘探
电磁法
effective resistivity；wave-area apparent resistivity；electric distance；transitionarea；non-plane-wave effect
