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Inductive coupling in IP measurements and applications to 3D distributed array field data inversion



Modern distributed DC/IP survey arrays can collect large amounts of broadband electrical data. These arrays are no longer limited to simple in-line dipole-dipole or pole-dipole surveys as they were in the past. This allows geophysicists to apply true 3D geometries and use arbitrary transmitter and receiver positions, which opens the door to high resolution 3D information about the spectral complex resistivity response of the earth and possibly mineral discrimination. However, these arrays also increase the computational complexity of solving the inverse problem for earth’s parameters. In addition, the increase in the frequency range of the collected data along with the complex wire paths raises the chances of incurring inductive coupling, which can hide the complex resistivity response. This paper examines the problems of inductive coupling in broadband, complex wire path surveys and finds that it can indeed affect the IP response. By using the full EM solution and known geometry of the wire paths, we can increase the usable IP data by about one decade of frequency or time measurements. We have modified an existing modeling and inversion code to handle the explicit geometry of the wire paths and to include the full EM effects, all in an efficient manner, which makes it possible to conduct a rigorous inversion of these 3D survey data. An inversion of the field data compares well with other information, demonstrating the effectiveness of the developed method.

Presentation Date: Wednesday, September 18, 2019

Session Start Time: 1:50 PM

Presentation Time: 3:30 PM

Location: Poster Station 10

Presentation Type: Poster