Interpretation of time-domain electromagnetic (TDEM)data over inhomogeneous geological struc- tures is a challenging problem of geophysical explo- ration. The most widely used approach of interpreting TDEM data is based on the smooth 1-D layered Resistivity inversion. We have developed an effective Technique of fast TDEM inversion based on thin-sheet Conductance approximation that we call S-inversion. In this paper we extend the S-inversion technique, Approximating the conductivity cross-section by adding A local inhomogeneous disk with an excess conductance ΔS to the horizontal conductive thin sheet used in S-inversion. Localized S-inversion determines the Distribution of this excess conductance as a function of A depth and a horizontal coordinate.
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