Abstract
The radio frequency electromagnetic (RFEM) technique is applied for detection and delineation of metalliferous ore zones, coal seams, and hydrocarbon reservoirs. Radio absorption tomograms are useful for qualitative interpretation, but generation of conductivity models via full inversion has hitherto proved too computationally expensive. Forward modelling of the electromagnetic response of a 3D environment is becoming feasible on portable computers, but conventional inversion, which requires a forward model calculation for each inversion parameter at each iteration, still requires excessive computer time. However, if a suitable approximate inverse is available, the computational overhead can be dramatically reduced. Approximate inverse mapping (AIM) inversion requires only a single forward calculation for each iteration. The potential of the AIM method for rapid inversion of RFEM data is illustrated in this paper, using absorption tomography as the approximate inverse. The method has been applied to cross-hole RFEM data from the Levack nickel-copper deposit, Canada.
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