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Title: Estimating overburden thickness in resistive areas from on-time airborne em data 
Authors: Bagley, Thomas
Keywords: geophysics;electromagnetism;inversion;Athabasca;uranium
Issue Date: 27-Sep-2019
Abstract: We propose a method to invert two-component time-domain EM data to a thick-sheet over half-space model, as a solution representing an overburden on top of bedrock. We first estimated the conductivity of the lower half-space using a combination of inversion for half-space (if appropriate) or a thin sheet over half-space (also when appropriate). This yielded a number of estimates, which could be combined to give a reasonable estimate of the lower half-space conductivity for the survey area. With this estimation an equation solver was used to solve the thick-sheet over half-space model for sheet thickness and sheet conductivity. The output of the algorithm was generally stable when applied to GEOTEM data in an area of moderately resistive overburden over a generally more resistive half-space. Although it did not reliably reproduce the overburden thicknesses as measured in the reference drill holes, it did give an estimate that was reasonable in the conductive areas.
Appears in Collections:Geology - Master's Theses
Master's Theses

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