电磁方法的拟地震解释

On pseudo-seismic interpretation of electromagnetic method

为了研究电磁勘探方法拟地震解释的可行性,针对电磁波与弹性波在传播理论上的类似之处,介绍了电磁法拟地震解释的基本原理,通过对探地雷达和常规电磁法使用的不同频率电磁波在损耗介质中的传播特性的对比分析,指出地质雷达使用的是超高频电磁波,传播规律和弹性波相似,可以直接利用地震勘探的处理解释方法进行解释;常规电磁法勘探因使用的电磁波频率较低,具有明显的色散效应,其传播规律和弹性波有较大差异,采用拟地震解释难以得到理想效果。该成果对电磁法拟地震解释的研究具有一定的指导意义。

To study of the feasibility of pseudo-seismic interpretation of electromagnetic methods ,based on the similarities of electromagnetic wave and elastic wave in the propagation theory, the principle of pseudo-seismic interpretation is introduced.The propagation characteristics are compared and analyzed in lossy medium of different frequencies electromagnetic waves applied by conventional electromagnetic prospecting and ground penetrating radar, which shows that the electromagnetic waves that the ground penetrating radar applied are in ultra high frequency, they spread in the similar rule with elastic wave, the interpretation methods that the seismic prospecting used can be used in ground penetrating radar directly; much lower frequency waves are applied in the conventional electromagnetic prospecting, they disperse distinctly, which is different from elastic waves, so it is impossible to achieve ideal results as the seismic prospecting though pseudo-seismic interpretation is used. The results have guiding significance to the study on pseudo-seismic interpretation of electromagnetic prospecting.