关键词: 大地电磁测深, 偏移, 成像, 松辽盆地

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