论文摘要：大地电磁测深（简称MT）是一种以天然的磁场与电场的交变场为场源，利用电磁场在地球内部的传播，并且在地面上接受其反射的场作为研究地球内部的构造的一种勘探方法。
本文可以分成两个部分，前半部分比较简要地介绍了大地电磁测深法的基本原理。从大地电磁场的特征出发，引入大地电磁场所遵从的最基本的原理麦克斯韦方程，通过理论分析和公式推导，逐步得到水平均匀情况下的大地电磁测深理论和二维介质情况下的大地电磁测深理论。
后半部分是本论文的重点所在，通过对MT基本理论的认识和理解，我们对MT曲线进行处理，提取一些有用的特征，然后再对这些提取的特征加以分析，要用这些特征对测线在水平方向上进行综合分区。文中详细叙述了各种提取得到的变量，给出了它们的效果图，并分析了这些变量是如何提取得到的以及它们有什么意义。不仅在横向上实现了自动分区，另一个方面，在纵向上的自动分层也是本文的一个重要目的。为此问中讨论了两种反演方法：Bostick法和拟地震解释法。前者一种半定量的反演方法，后者是一种基于地震反射波理论的反演方法。通过这两种方法的联合反演，实现了对纵向上的分区。
ABSTRACT：Magnetotelluric sounding is a kind of exploration method. And its field is that hand overing of natural magnetic field and electric field changes the field. It make use ofs to make use of the electromagnetism field at the spreading of the Earth inner part to the structure of studying the Earth inner part.
The dissertation can be divided into two parts.The rationale of Magnetotelluric sounding will be briefly introduced in part one.It begins from characteristics of Magnetotelluric field,and then we will import the rationale to which Magnetotelluric field must,that is Maxwell equations.Through theory analyzing and formula deducing ,we will get the Magnetotelluric sounding theory for horizontal even medium and for two_dimension medium step by step.
The last part is the keystone of this dissertation.With comprehension of MT theory we will disposal MT curves, distill some useful characteristics from them,and then divide the observation line into areas
by analyzing these characteristics.The thesis will introduce each distilled variable in detail, show some effect plot, and analyse how to distill them as well as their significance.Not only realizing transverse automatic area partition,but also , longitudinal automatic layer partition is an important part of this dissertation.For the sake of this,we discuss two inversion methods:Bostick and simulate-seismic.The former is of half-quantificational inversion and the later is based on the theory of seismic reflection. Longitudinal automatic layer partition is actualized by combining these two methods.
1．前言
2. 大地电磁测深法的基本原理和定性解释
3. 大地电磁测深曲线特征提取的基本原理及应用
4. 软件的计算机实现及理论模型的验证
5. 处理实例
6. 结论
参考文献
