Abstract
An new electromagnetic imaging scheme, including equipment, setting and image algorithm, is put forward in this paper. The surface-to-borehole setting, with an alternating current source on the surface, is adopted. An new two step inversion algorithm is employed: inverse scattering current at first and then inverse electric conductivity. Through this method, the difficult nonlinear image equations are linearized, so electromagnetic imaging for any kinds of electric conductivity contrast can be done principally.
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