Patent Document ID: 20020173913
Application ID: 09825104
Patent Flag: 0

Claim One:
1. A method of logging of subsurface formations including at least one layer having a horizontal conductivity and a vertical conductivity, the method comprising: (a) conveying an electromagnetic logging tool into a borehole in the subsurface formations; (b) using said electromagnetic logging tool for obtaining, at each of a plurality of frequencies, at least one measurement indicative of at least one of said vertical conductivities; (c) applying a skin-effect correction to said at least one measurement at said plurality of frequencies and obtaining a skin-effect corrected conductivity measurement associated with said at least one layer; (d) obtaining a model including, for said at least one layer, a layer thickness and a horizontal conductivity; (e) determining an expected value of said at least one skin-effect corrected conductivity measurement from said model; (f) determining from said skin effect corrected measurement, said expected value of the skin-effect corrected measurement, and said horizontal conductivity, a vertical conductivity of the at least one layer.