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AssigneeWestern Atlas International, Inc.
InventorsLeonty Abraham Tabarovsky, Michael Boris Rabinovich
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The invention is a method of inversion processing signals from an induction well logging instrument including a transmitter and a plurality of receivers at spaced apart locations. The method includes skin effect correcting the responses of the receivers by extrapolating the receiver responses to zero frequency. A model is generated of the media surrounding said instrument. Conductivities of elements in the model are then adjusted so that a measure of misfit between the skin-effect corrected receiver responses and simulated receiver responses based on the model is minimized. The geometry of the model is then adjusted so that the measure of misfit between the skin-effect corrected receiver responses and the simulated receiver responses based on the model is further minimized. In a preferred embodiment of the invention, the step of adjusting the geometry includes minimizing the measure of misfit between the simulated responses and the receiver responses from selected ones of the receivers closely spaced to the transmitter. Numbers of and positions of radial boundaries are then determined by minimizing the measure of misfit for all the receiver responses.
A method of inversion processing signals from an induction well logging instrument having a transmitter and a plurality of receivers at axially spaced apart locations, comprising:
A method of determining resistivities of earth formations penetrated by a wellbore, comprising:
A method of inversion processing signals from an induction well logging instrument having a transmitter and a plurality of receivers at axially spaced apart locations, comprising:
A method of skin effect correcting receiver signals from an induction well logging tool having a transmitter and a receiver, comprising:
Dependencies are inferred from the claim text.