Method for iterative determination of conductivity in...

Details Method for iterative determination of conductivity in... Method for iterative determination of conductivity in...

G - Physics

01

V

G01V 3/18 (2006.01) E21B 47/026 (2006.01) G01V 3/28 (2006.01) G01V 3/38 (2006.01)

Patent

CA 2348204

A method is disclosed for the determination of horizontal resistivity, vertical resistivity, dip and strike angles of anisotropic earth formations surrounding a wellbore. Electromagnetic couplings among a plural of triad transmitters and triad receivers are measured. Each triad transmitter/receiver consists of coil windings in three mutually orthogonal axes. These measured signals are used to generate initial estimates of the dip angle and strike angle of the formation as well as the anisotropy coefficient and the horizontal resistivity of the formation. An iterative algorithm is then applied using these quantities to finally arrive at more accurate estimates that approach the true values in the formation.

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