摘要
可控源大地电磁(CSAMT)资料的三维正、反演问题已成为国际地球内部电磁感应领域研究的前沿课题.本文介绍了可控源音频大地电磁法中三种主要的数值模拟正演方法,即有限元法、有限差分法,积分方程法,比较了这三种方法的优缺点.积分方程法只需对异常区进行剖分,仅需计算小体积异常区的场,计算速度快,但只适合模拟简单模型,精确度也较低;有限元法与有限差分法虽然精确度较高,但要求对全部区进行离散化,占用的计算机容量较大,计算时间长,因此基于并行算法的三维电磁场正演研究可能是可控源音频大地电磁法未来的发展趋势.
The forward and inverse modelling of three-dimensional CSAMT problems have become the frontal issue in the field of international telluric interior EM induction. In this paper three main methods of three-dimensional CSAMT forward modelling are briefly introduced： finite element method, finite difference method, integral equation method. We compared the advantages and disadvantages of the three methods. The integral equation method only needs to subdivide the abnormal body, computes fields of small volumes of the abnormal body, in which computing speed is fast. But this method only fits for simple model simulation and the accuracy is low. Although the precision of the finite element method and finite difference method is higher, the two methods require to divide the whole region, occupy a larger computer capacity, and consume a long computation time. So the three-dimensional electromagnetic forward modelling of CSAMT based on parallel algorithms is the future development trend.
出处
《地球物理学进展》
CSCD
北大核心
2010年第5期1795-1801,共7页
Progress in Geophysics
基金
国家自然科学基金(40974040)
国家科技重大专项(2008ZX05019-007)
关键词
CSAMT
有限单元法
有限差分法
积分方程法
CSAMT, finite element method, finite difference method, integral equation method
