大地电磁测深数据TE与TM极化模式的对比

TE and TM polarization modes for contrast of magnetotelluric data

在大地电磁测深工作中,由于实际地下介质的非均匀性,所得到实测资料的TE、TM极化模式视电阻率曲线有很大差异,给正确认识和判断实际地质结构带来困难。通过建立简单地堑、地垒及断层模型,并进行正反演,总结了这些模型条件下TE、TM极化模式的响应规律,为大地电磁测深数据的定性分析和解释提供了依据。

In magnetotelluric （MT）sounding, inhomogeneous underground media make apparent resistivity curve quite different with different TE and TM modes surveyed. Therefore, different modes can get different interpretation results which will bring difficulty to understand and judge geological configuration. Although there are obvious differences from polarization apparent resistivity curve between TE and TM mode, there are some regularities in specific geological configuration, simple graben, horst and fault model were set up and forward and inversion calculated their apparent resistivity with TE and TM modes which play an important role on data processing and interpretation. So it is meaningful to find and understand these regularities.