【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。更多还原

【Abstract】 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.更多还原