The Study Of One-dimensional Joint Inversion For Time-and Frequency-domain CSEM Data

Controlled-source audiomagnetotellurics method has many advantages. Such as strong antijamming ability; good investigated depth; size and direction of the source are controlled; Moreover, it’s sensitive to the low resistivity anomaly. Based on those advantages, this method is always used in Oil&Gas exploration, general survey of mineral resources, hydrogeology material handling and so on. Restricted by band, both frequency domain and time domain of the controlled-source audiomagnetotellurics method have advantages on exploration of the middle and shallow layers. Moreover, there are no static migration and topography influence in shallow layers transient electromagnetism method. Therefore, Mapping with these two methods together can effectively solve the exploration problem which is from geological shallow layers to deep layers. Joint of multi method and multi parameter is the main direction of earth physical inversion.This paper is based on the explanation for the inversion of controlled-source audiomagnetotellurics data on frequency domain and time domain. It carries out the study of frequency domain and time domain of the controlled-source audiomagnetotellurics data for1-D inversion by combination of quick forward calculation and ill-posed problem solution theory, method of generating DEM contrast. The main contents of the thesis are as follows:(1) Introduce the features between calculation method and forward calculation by the studay of1-D forward for frequency domain and time domain, provide the basis for inversion calculation;(2) Employment of joint inversion, decrease multi-solution of single inversion method and improve the vertical resolution;(3) Through the application example and explanation result of joint inversion, it provides a geology interpretation. The study of thesis gives a great theoretical and practical significance to the problems of the earth physical inversion. Moreover, it gives a boost to the extension of controlled-source audiomagnetotellurics method in resource exploration.