Analysis and interpretation of anomalous conductivity and magnetic permeability effects in time domain electromagnetic data Part II: S mu-inversion

In the paper by Pavlov and Zhdanov [J. Appl. Geophys. (2001)], we demonstra ted that anomalous magnetic permeability of an ore body could result in mea surable anomalous effects in TDEM data, which can be used in geophysical ex ploration. In the current paper, we develop a new method of TDEM data inter pretation, which allows simultaneous reconstruction of both electrical and magnetic properties of the rocks. The method is based on a generalization o f the S-inversion technique [66th AM. Int. Mtg., Sec. Expl. Geophys., Expan ded Abstr. (1996) 1306; 68th Ann. Int. Mtg., Sec. Expl. Geophys., Expanded Abstr. (1998) 473; J. Appl. Geophys. (1999)] for models containing thin she ets with anomalous conductivity and anomalous magnetic permeability. We cal l this method S mu -inversion. Numerical 3-D modeling results demonstrate t hai S mu -inversion provides useful information about both subsurface condu ctivity and magnetic permeability distributions. It can be used as a new to ol for imaging TDEM data in mineral exploration. (C) 2001 Elsevier Science B.V. All rights reserved.