电偶源海洋瞬变电磁法三维数值模拟与响应特征研究

由于海底能源资源勘查和其他研究的需要,人工源海洋电磁法已经成为一个研究热点。使用傅里叶伪谱法来模拟瞬变水平电偶极源对不同三维海底模型的响应,与全空间解析解对比,验证算法的正确性。海底低阻体模型响应说明,时间域电磁法可以连续地追踪电磁场扩散及与海底低阻体的响应过程。高阻体模型响应说明,可以通过研究早期电磁场的幅值随收发距的变化来确定高阻体的存在。

A Study of 3D Marine TEM Modeling and Response Characterization of electric dipole source

For the need of prospecting of energy sources and resource and other study, marine electromagnetic method has been a hot area of research. We use the Fourier pseudo-spectral method to calculate electromagnetic response of different 3-D models in sea in time domain. We use horizontal electric dipole source in this paper. To verify the method, the numerical solutions are compared with analytical solutions. The response of low resistance model turns out that the advantage of TEM is that it can simulate electromagnetic propagation and the response of the low resistance continuously. At last the high resistance body model indicates that it can observe the variation of electromagnetic field amplitude in early time to confirm the high resistance body.