摘要
对电磁场成像技术进行了系统总结 ,分析阐述了大地电磁场成像技术的研究现状与存在问题 ,并对各种方法的特点进行了比较和归纳 ,进而在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 ,该方法提高了差分方程的精度和成像分辨率 ,并对客观选取背景电导率、两种极化模式联合成像、多参数和再次成像以及全频段成像和成像结合反演技术进行了研究 .
Based on systematic study of EM imaging techniques, this paper first summarizes the achievements carried out by former researches and points out their limitation. Then, puts forward the migration imaging technique of magnetotelluric data by introducing an improved finite difference method using the experience of Zhdanov for reference, which increases the accuracy of the difference equation and the imaging resolution. Moreover, the paper also makes further researches such as the selecting of the suitable conductivity background, joint imaging of two polarized modes, multi parameters and second process imaging, the whole frequency band imaging and imaging versus inversion technique.
出处
《地球物理学进展》
CSCD
2003年第1期53-58,共6页
Progress in Geophysics
基金
国家自然科学基金项目 ( 4 0 10 40 0 5 )和 ( 4 9894190 )资助 .
关键词
大地电磁测深
偏移
成像
反演
有限差分法
magnetotelluric sounding, migration, imaging, inversion, finite difference
