The Iterative Inversion Method Of Magnetic Interface Ups And Downs

In the early period of evaluation about basic structures,magnetic prospecting provided more convenient way in geophysical prospecting work,with taking advantage of its own characteristics of Less input,easy access to the field,wide range covering for unusual and effective information,data processing and shorter interpretation time.The processing and interpretation of magnetic data,the determination of the fluctuations of the magnetic geological interface and the depth of the magnetic basis,which is one of the important tasks for magnetic prospecting in in solving basin deep tectonic information.Studying the interface of magnetic strata has extremely important theoretical and practical value both in study the formation and evolution of the basin and the distribution of mineral,oil and gas resources,such as oil and gas formation,migration and occurrenceThe method of inversion magnetic interface depth can be divided into two categories: frequency domain and space domain,The spatial domain magnetic interface iterative inversion method that we studied in this paper is greatly influenced by the interface average depth of the proper selection,the deeper average interface you chose,the deeper entire interface the study will get,otherwise it will be more shallow.Therefore,it is important to determine the average depth of the interface before the inversion of the magnetic interface depth.The method of using power spectrum to determine the average depth of the interface are given in this paper,which has a big advantage of getting the result without magnetic interface material before the inversion.But before make confirmation of the initial interface value,We need to extend the observation surface field downward,Based on the iterative method proposed by the academician Xu Shizhe,this paper avoids the problem of divergence of field value effectively.Based on the theory of model test,which indicates that the magnetic interface in the spatial domain iterative inversion method is reliable,and It has certain pratical application value.At the same time,this method is used to deal with the magnetic survey data of northern south China sea,and obtains the characteristics of the magnetic basement and the fluctuation of the curie-surface in south China sea.