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首页> 外文期刊>Journal of geophysics and engineering >Electromagnetic modelling with wave tilt and reflection coefficient: an application to stratified earth media using low and radio frequencies
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Electromagnetic modelling with wave tilt and reflection coefficient: an application to stratified earth media using low and radio frequencies

机译：具有波倾斜和反射系数的电磁建模：在低频和射频的分层地球介质中的应用

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Many models using electromagnetic sounding techniques have been formulated for use in exploration activities. In deriving the governing equations for the models, Maxwell's equations are used and the earth is taken as a layered medium. Using these boundary conditions, the Sommerfeld integrals are obtained for several models. However, the difficulties and limitations posed by the iterations of the functions, especially the strong oscillations and slow convergence of the Bessel function, call for a search for new methods. This work aims to formulate models, with the advantage of bypassing the problems highlighted above, and to discover new response parameters not considered by the older models due to the limitations of time. Three measurable field parameters, (1) amplitude of the correction factor to the wave tilt, (2) phase of the amplitude of the correction factor to the wave tilt and (3) reflection coefficient, were calculated from this model with various conductivity contrasts over a two-layered earth. Two cases of a top layer overlying a more conductive basement and a more conductive top layer overlying a resistive basement were considered with a radio frequency of 125 kHz and a low frequency of 10 Hz. The model was tested using data from existing models and was then applied to a homogeneous and a layered earth. Results revealed that the phase of the amplitude of the correction to the wave tilt was found to be most diagnostic of the changes in layer parameters. Also, depths of 20 m and 2000 m were achieved with the two respective frequency values. The reflection coefficient was discovered to be an important parameter for detecting layered earth structures, in addition to other parameters. Furthermore, an inverse relationship between the transverse electric and transverse magnetic modes of the reflection coefficient is established.
机译：已经制定了许多使用电磁探测技术的模型用于勘探活动。在推导模型的控制方程式时，使用麦克斯韦方程式，并将地球作为分层介质。使用这些边界条件，可以为多个模型获得Sommerfeld积分。但是，函数迭代带来的困难和局限性，特别是贝塞尔函数的强烈振荡和缓慢收敛，要求寻求新方法。这项工作旨在建立模型，其优点是绕过了上面强调的问题，并发现了由于时间限制而旧模型未考虑的新响应参数。从该模型计算了三个可测量的场参数，（1）对波倾斜的校正因子的幅度，（2）对波倾斜的校正因子的幅度的相位和（3）反射系数，在一个两层的地球。考虑了两种情况：顶层覆盖更高的导电性基底，顶层覆盖更高的电阻性基底，其射频为125 kHz，低频为10 Hz。使用现有模型中的数据对模型进行了测试，然后将其应用于均匀且分层的地球。结果表明，波倾斜校正幅度的相位最能诊断层参数的变化。同样，使用两个相应的频率值可获得20 m和2000 m的深度。除了其他参数外，还发现反射系数是检测分层地球结构的重要参数。此外，建立了反射系数的横向电磁模式和横向电磁模式之间的反比关系。

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