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Quick Inversion of Multi-configuration Electromagnetic Induction Data Using Cumulative Response Functions
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 23rd European Meeting of Environmental and Engineering Geophysics, Sep 2017, Volume 2017, p.1 - 5
Abstract
In this paper we present a quick method for one-dimensional inversion of multi-configuration electromagnetic induction data, obtained by instruments operating at low induction numbers, using cumulative response curves. As it is very fast and easily programmed it can be used when a real-time quick inversion in the field is desired and as a good initial guess model estimation for more sophisticated inversion techniques. In the proposed technique we make use of several measurements of apparent conductivity, performed with different transmitter-receiver dipoles configurations in a same location to estimate a one-dimensional model where the number of layers is equal to the number of measurements. The depths of the bottom of the layers are estimated as the depths of investigation of each configuration measurement. The conductivities of the first two layers are obtained by solving the linear system formed by the forward modelling equations for computing the apparent conductivity using the cumulative response functions for the two first configurations measurements. The conductivities of the remaining layers are obtained recursively using the previous estimated conductivities and the data measured by the following configurations using the same approach.