本文以表面极化球体为例,根据点源电流场中有极化球体存在时的位场理论,用阻容并联的等效电路模拟极化单元,导出了偶极装置交流激电场的实分量、虚分量、振幅和相位的近似理论计算公式,并由计算结果较系统地讨论了(1)影响复电阻率幅频和相频特性的因素;(2)视频散率、视电阻率和相位剖面曲线及断面等值线的分布规律。以上内容对交流激电法的正确选频及资料解释均有一定实际指导意义。 In this paper, the surface polarization sphere is taken as an example. According to the field theory in the presence of polarized spheres in the point-source current field, the real components of the AC field in the dipole device , Imaginary component, amplitude and phase are discussed theoretically. The factors that affect the amplitude and phase of the complex resistivity are discussed systematically (1) The factors that affect the amplitude and phase frequency of the complex resistivity; (2) The dispersion rate, apparent resistivity and phase Profile curve and section contour distribution rule. The above content AC alternating current method of frequency selection and data interpretation have some practical significance.