Abstract
A major impediment in the path towards airborne IP is an effective method to quantify data from inductive sources, such as those used in airborne electromagnetic systems. We model Inductive IP using a combination of Warburg and exponential decay models as a basis for fitting electromagnetic data from ground TEM and airborne VTEM surveys. Observed decays are deconvolved into EM and IP constituents by constrained least squares fitting of basis functions modified to account for transmitter waveforms. The method has been confirmed through synthetic modelling of 2D and 3D structures, and when applied to ground TEM or airborne TEM data, obtains an estimate of apparent chargeability at each station or fiducial. In the case of a VTEM survey in Africa, the apparent chargeabilities mapped graphitic sediments and provided spatially consistent indications of clay concentrations. A limitation on this airborne IP for airborne applications is motion noise, which places a lower limit on usable base frequency and begins to significantly affect the signal at the later delay times, when IP effects are most visible.
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