电偶源频率电磁测深二维阻抗视电阻率计算的源效应校正法

A SOURCE-EFFECT CORRECTION ALGORITHM CALCULATING 2-D IMPEDANCE APPARENT RESISTIVITY OF FREQUENCY ELECTROMAGNETIC SOUNDING WITH ELECTRICAL DIPOLE SOURCE

研讨了频率域电磁法中不同源装置的大地电磁测深、线源频率电磁测深和偶极源频率电磁测深阻抗视电阻率的源效应影响特征。在唯象分析的基础上，提出了几种电磁测深法阻抗视电阻率的相互换算法──源效应校正法（大地电磁测深二维ＴＥ极化视电阻率和其它两种电磁法的赤道装置二维阻抗视电阻车）。模型试验表明，利用这一源效应校正法可以由大地电磁二维视电阻率近似地计算出线源频率电磁二维阻抗视电阻率。这一方法被尝试应用于由线源频率电磁二维阻抗视电阻率估算偶极源频率电磁二维阻抗视电阻率。

In this paper the source-effect characteristics of impedance apparent resistivity in magnetotelluric sounding (MTS), EM soundings with infinite line source(ILS)and electricaldipole source (FEM) which are EM soundings with different source equipments in frequencydomain were discussed. On the basis of phenomenalized analysis a algorithm for reciprocatedcalculation of apparent resistivities in several EM methods-the source-effect correction algorithm was given(the 2 - D apparent resistivity of TE mode in MTS and the 2 - Dimpedance apparent resistivity of equatorial equipment in ILS and FEM). The model testsshow that using this source-effect correction algorithm and through the 2-D apparent resistivity in MTS,the 2-D impedance apparent resistivity in ILS can be calculated in a better' approximate degree. This algorithm is applicated to the calculation of the 2-D impedance apparent resistivity in FEM from the 2-D impedance apparent resistivity in ILS.