Modelling induced polarization effect in frequency domain aem data

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Abstract

Airborne electromagnetics is one of the most widespread methods of geophyysical survey. In the process of exploration airplane obtains data on electromagnetic response of the medium to the signal of controlled electromagnetic source. Often it is possible to create a simple model of the medium, havin real-valued apparent resistivities. However, sometimes data are significantly impacted by the induced polarizzation effect. It manifests itself in dependence of apparent resistivity on signal frequency. The classical approach to modelling IP consists in using a frequency dependent resistivity model for each layer of the medium. However, the number of parameters in this approach increases rapidly with resolution, hence the inversion problem becomes incorrect. The lack of unique solution of inverse problem leads to the final result of data interpretation being dependent on starting model and prior information.In this work authors suggest an approach to solving this problem, which is applied for inversion of real data. It is shown that sometimes the starting model may be chosen based on analysis of responses obtained for a part of data close to the one containing IP.

About the authors

Dmitrii Kirillovich Khliustov

V.A. Trapeznikov Institute of Control Sciences of RAS

Email: hlustov.d@gmail.com
Moscow

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