Full Waveform VTEM Helicopter EM System Case Studies

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Summary

Early time or high frequency airborne electromagnetic data (AEM) are desirable for shallow sounding or mapping of resistive areas but this poses difficulties due to a variety of issues, such as system bandwidth, system calibration and parasitic loop capacitance.

In an effort to address this issue, a continued system design strategy, aimed at improving its early-channel VTEM data, has achieved fully calibrated, quantitative measurements closer to the transmitter current turn-off, while maintaining reasonably optimal deep penetration characteristics of the VTEM system, known as the “Full Waveform” system.

Recent development testing of the full-waveform VTEM system over a shallow groundwater aquifer and poorly contrasted kimberlite are showcased in case-studies.

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