Sharp Boundary Inversion Used In Linjiang Liudaogou Controlled Source Audio Magnetotelluric Sounding Data Inversion

Geophysical methods is to understand the subsurface structure effective exploration methods. Deep regional prospecting requires exploration depth, strong anti-interference ability, high-resolution geophysical methods as a support, which is the traditional method of geophysical challenges. By Linjiang Liudaogou of Copper and other metal ore depth study and master the deep structure of mineral resources, mineral resources law to identify the occurrence and location of occurrence, by means of geophysics in the region to provide direct or indirect Changbai Mountain basalt cover construction information region and geological conditions in Changbai Mountain basalt coverage area, and ultimately achieve the purpose of prospecting.Mineral Resources in Jilin Province have been identified can not guarantee rapid economic and social development, thus speeding prospecting mission has become increasingly urgent. Currently, the exploration of mineral resources in Jilin average depth of only 300 m or so, there are still about one third of the land area of basalt no coverage or low reconnaissance survey extent, Jilin province and deep reserves of mineral resources is huge. Therefore, the detection coverage area basalt deep resources to learn Changbai Mountain basalt thickness, thickness range Paleozoic sedimentary basins, as well as undulating shape base is necessary.Linjiang Liudaogou in copper and other metal mines collected from controlled source audio magnetotelluric(CSAMT) data, this paper uses an electric field forward iterative fitting Carney ATV resistivity method CSAMT the region apparent resistivity data rate conversion, obtain apparent resistivity region. After acquiring the region apparent resistivity, two-dimensional inversion, in order to overcome smooth model inversion boundary position is not clear defects, Catherine de Groot-Hedlin(2004) proposed a two-dimensional sharp boundary inversion of MT(sharp boundary inversion) Acronym SBI inversion method, by introducing new restrictions roughness, not only controls the formation resistivity difference, but also on the depth constraints, to avoid excessive boundary position redundant configuration.Finally, the region apparent resistivity Linjiang Liudaogou area controlled source data conversions were Occam inversion and inversion SBI compared results of both inversion, final results of the analysis and interpretation of the inversion, trans The results showed that OCCAM play depicts the fuzzy boundary is not conducive to determine the location of the abnormal geological boundary. The SBI inversion can well depict the electrical interface unit boundary position, in favor of the interpretation of the measured data.