摘要
由于中深度工程地球物理勘探的迫切需要,以美国EH-4电导率成像系统为代表的高频率大地电磁法,在我国地球物理勘探行业的应用越来越广泛。其勘探深度在地下1 000 m以内,频率范围在10 Hz^100 kHz。这里研究了高频率大地电磁法有限元高精度,快速数值模拟。首先利用广义变分原理推导出电磁场的有限元方程,编制了双线性和双二次插值有限元程序,并进行了层状模型的验证性计算,然后对典型地堑模型的数值模拟结果进行了分析,得出了一些有意义的结论。
With the requirement of middle-deep depths civil engineering geophysical exploration Magnetotelluric(HMT) method is applied more and more extensively in our country and EH-4 conductivity imaging system made in USA is representative system with the prospecting depth of 1000 meters below surface and the frequency range of 10 Hz to 100 KHz.In this paper,the author studies numerical modeling of the high-frequency Magnetotelluric method.First of all,the author derives the finite element equation of HMT method from Maxwell equations using generalized variational principles,make the bi-linear interpolation and double quadratic interpolation finite element program and make the computation for the validation.And then,the author researches numerical modeling results for the typically rift valley model and gains some meaningful conclusions.
出处
《物探化探计算技术》
CAS
CSCD
2009年第4期297-302,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家863计划(2007AA06Z134)
国家自然科学基金(40874072)
湖南省高等学校科学研究项目(08D008)
湖南省自然科学基金(07JJ3087)
关键词
高频大地电磁
线性插值
二次插值
有限元正演
EH-4电导率成像系统
high-frequency magnetotelluric(HMT) method
linear interpolation
quadratic interpolation
finite element forward modeling
EH-4 conductivity imaging system
