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3D-spectral CDIs... a fast alternative to 3D inversion?
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 6th International AEM Conference & Exhibition, Oct 2013, cp-383-00027
Abstract
Virtually all AEM is interpreted using stitched 1D conductivity sections, derived from constrained inversion or fast but fairly accurate approximations. A small subset of this AEM data recently has been inverted using either block 3D models or thin plates, which processes have limitations in terms of cost and accuracy, and the results are in general strongly biased by the choice of starting models. Recent developments in spectral modelling have allowed fast 3D approximations of the EM response of both vortex induction and current gathering for simple geological target geometries. Fitting these spectral responses to AEM data should be sufficient to accurately locate current systems within the ground, and the behaviour of these local current systems can in theory approximately define a conductivity structure in 3D.