Abstract: We summarize the achievements and defects on the study of EM imaging techniques. We put forward the migration imaging technique of magnetotelluric data using the improved finite difference method, which increases greatly the accuracy of the difference equation and the imaging resolution. Our aim is to raise the research level to a processing and interpretation stage for real observed data and complicated geo-electric models better than the simple models test. Based on the calculation results of the observed MT data in the Songliao Basin, the approach we provide has been testified as a more accurate and effective measurement for MT imaging, especially for the interpretation of complicated geological problems.

Key words: Magnetotelluric sounding, Migration, Imaging, Songliao Basin

摘要： 总结和分析了大地电磁场成像技术的研究现状,在Zhdanov等对偏移电磁场的研究和成像技术基础上,提出了改进的有限差分法大地电磁场偏移成像技术,使差分方程精度和成像分辨率有了明显的提高,将前人大地电磁场偏移成像的模型试验研究推进到适用于复杂地电模型和实际资料处理解释的阶段,并通过松辽盆地大地电磁测深资料的偏移成像处理和解释展示了该方法的有效性和实用性。

关键词: 大地电磁测深, 偏移, 成像, 松辽盆地