Processamento de dado AEM: CDI e inversão para o sistema GEOTEM

The aim of this paper is to carry out a comparison between two types of 2D electromagnetic modeled sections. They are normally used on AEM (Airborne EletroMagnetic) quantitative interpretation, especially on those obtained from ATDEM measurements (ATDEM). One is derived from fast modeling of the asymptotic secondary magnetic flux decay and is one of the most common quantitative interpretation tool. The other is based on the wave equation and is of more restrict usage as 1D inversion techniques, both parametric and structural. The two approaches were applied to airborne GEOTEMTM system real data, collected on a survey at San Pedro Valley (Southeast Arizona) in 1997. The available data from this survey was made available by the USGS and was used in this quantitative analysis. As such, 2D sections from 1D model inversion were obtained. The geoelectrical model from these sections were further 3D (volumetric) interpolated (voxels), allowing a 3D representation form off the region spatial conductivity distribution.