阻抗张量分解进行大地电磁静校正的研究

STUDY OF CORRECTION FOR STATIC SHIFT:THE DECOMPOSITION OF MAGNETOTELLURIC IMPEDANCE TENSORS

地表电性不均匀体对大地电磁测深的静态影响，会使大地电磁测深曲线产生十分严重的畸变，如何进行静校正以获得合理的区域构造响应，引起了国内外大地电磁专家的广泛关注。阻抗张量分解就是近几年发展起来的一种有效的方法。在全面论述阻抗张量分解进行大地电磁静校正原理的基础上，通过模型试算证明了该方法的有效性。

The static effects of small scale or near surface conductivity inhomogeneities on magnetotelluric might distort the sounding curves severely.How to correct the static shift and get applicable regional response have been studied by magnetotelluric specialist.The decomposition of impedance tensors is a effective method developed in recent years.In this paper,the theory of why and how using decomposition of impedance tensors to correct static shift is illustrated.We use this method to correct the static shift with synthetic data,which proves its effectiveness.At the same time,some issues to this method is presented.