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在以往实践应用的基础上,主要从均匀半空间内球体模型的角度研究天然电场选频法异常的成因.首先从自然因素和人文因素2方面分析天然电场选频法的场源问题;从麦克斯韦方程组出发,利用边界条件求取谐变磁场作用下,均匀半空内导电导磁球体在地表主剖面上感应二次电场的解析计算式;根据拉普拉斯方程和边界条件,获得谐变电场作用下,均匀半空间导电球体在地表主剖面上的异常电场水平分量计算式;对理论模型的各个参数进行假定,计算三维谐变磁场、谐变电场作用下,地表主剖面上良导球体的水平电场异常曲线.通过对模拟计算结果分析可知,在水平谐变磁场和谐变电场共同作用下,获得的地表电场异常曲线与野外实测结果形态相似、特征相同.
Based on the previous practical applications, the causes of anomaly of natural electric field frequency selection method are mainly studied from the perspective of uniform half-space model of internal sphere.Firstly, the field problems of natural electric field frequency selection method are analyzed from natural and human factors 2, Based on the Laplace equation and the boundary conditions, a harmonic electric field is obtained based on the Laplace equation and the boundary conditions. Then, using the boundary conditions, the analytic formula for the induced secondary electric field on the main surface of the earth is obtained. Field under the action of uniform half-space conductive sphere in the main surface of the earth’s anomalous electric field level component formula; the theoretical model of the various parameters are assumed to calculate the three-dimensional harmonic magnetic field, harmonic electric field, The horizontal electric field anomaly curve of the sphere.Analysis of the simulation results shows that under the combined effect of horizontal harmonic magnetic field and harmonic electric field, the surface electric field anomaly curve obtained is similar to the field measured results and has the same characteristics.