Combining multiple components of infiniTEM electromagnetic data to better represent subsurface anomalies

Mercer, Adam Matthew (2012) Combining multiple components of infiniTEM electromagnetic data to better represent subsurface anomalies. Masters thesis, Memorial University of Newfoundland.

[English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (6MB)

Abstract

Time-domain electromagnetic (TDEM) surveys rely on electromagnetic induction from a time varying magnetic field to produce recordable responses from conductive material in the subsurface. Interpretation of TDEM data is dependent on the location of a conductor in relation to the primary field of the transmitter and therefore can be very complicated. This is especially true for the InfiniTEM® figure 8 transmitter configuration where the same vertical conducting plate can produce a variety of signatures depending on its location relative to the transmitter loop. This study investigates the usefulness of the energy envelope processing technique to combine multiple components of InfiniTEM® survey data to remove the directional dependance on the primary field. The energy envelope involves adding the vertical and horizontal components responses with associated Hilbert transforms in quadrature to create a single profile peaking over the location of an anomaly. This approach provides a more intuitive contour map for interpretation.

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