Forward Simulation and Apparent Resistivity Calculation of Transient Electromagnetic Method Using Magnetic Dipole Source on the Layered Medium
Abstract: The forward of transient electromagnetic method (TEM) is the basis of the theoretical study of multi-dimen- sional transient electromagnetic prospecting. Transient coupling curves of each field component of different geoelectric sections can be obtained through forward calculation, and all the field components decrease rapidly as time increases in the middle and late time. Important characteristics of the geoelectric sections can be acquired by converting the field components to apparent resistivity curves. The calculation formula is derived from Hankel transform and G-S transform, and the numerical algorithm is proposed for the vertical magnetic field of transient electromagnetic method with mag- netic dipole source in the layered medium. Then the magnetic field components, calculated for several typical layered medium models, are converted to apparent resistivity values according to the definition of the apparent resistivity. The relative errors of the field components between the forward results and theoretical values are all less than 0.1%. The calculation results show that the apparent resistivity curves directly reflect the characteristics of geoelectric sections. And the anomaly of the low resistivity layer is more obvious than that of high resistivity layer. Furthermore, the negli- gible errors show that the forward results are reliable. It is valuable for theoretical research and practical application of transient electromagnetic method.
文章引用: 肖建平 , 刘 博 , 王 凡 , 梁慧琛 , 于 翠 , 何生龙 (2013) 层状介质磁偶源瞬变电磁法正演及视电阻率计算。 地球科学前沿， 3， 191-196. doi: 10.12677/AG.2013.33027
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