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Robust Methods of Determining Target Objects Using Block Structures for Em Data Processing
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Engineering and Mining Geophysics 2019 15th Conference and Exhibition, Apr 2019, Volume 2019, p.1 - 6
Abstract
The paper proposes the approach to increase the reliability of determining target objects locations and their characteristics with the use of geometric 3D-inversion of electromagnetic survey data. This approach is based on the analysis of repeatability of 3D-inversion results for different rotations of the initial model block structures around the vertical axis. The forward problem solution is based on the finite element method on the nonconforming meshes with hexahedral cells, which smoothly approximate the curved surfaces: the Earth relief and subhorizontal borders between the geoelectrical model layers. The possibilities of the proposed approach are demonstrated on synthetic data for a complex multilayer geoelectrical model, which is characterized by the relief and contains lateral complex shape 3D-inhomogeneties overlapping the target object. The numerical experimental results show well the repeatability of conductivity distributions obtained as the inversion result for different rotations of the initial model block structures. This suggests the possibility of reliably determining the target objects in the realistic complex geoelectrical conditions.