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Geometrical Nonlinear 3D Inversion of Airborne Time Domain EM Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2016 - First Conference on Geophysics for Mineral Exploration and Mining, Sep 2016, Volume 2016, p.1 - 5
Abstract
This paper proposes the approach for 3D processing of airborne time domain EM data for finding subvertical objects beneath a conductive lateral inhomogenous overburden. The approach is based on the geometrical nonlinear 3D inversion and finite element modeling of electromagnetic fields. When performing the geometrical 3D inversion, the vector of unknown parameters includes both the objects conductivities and coordinates of the objects borders. This approach includes three main stages: preliminary reconstruction of the structure of the lateral inhomogenous overburden for approximately locating the target subvertical object; preliminary reconstruction of the target object characteristics; final reconstruction of the characteristics of all inhomogeneities of the geoelectrical model including the target object. The possibilities of this approach are shown with the use of synthetic airborne EM data.