Patent ID: 6822455
Filing Date: 2004-11-23
Classification: G01V

Abstract:
A system for evaluating a geologic formation property proximate to a borehole through such formation, comprising:a tool body moveable through the borehole; a first transmitter engaged with said tool body for generating a signal into the geologic formation; a second transmitter engaged with said tool body proximate to said first transmitter for generating a signal into the geologic formation; a first receiver engaged with said tool body for receiving signals generated by said first and second transmitters; and a second receiver engaged with said tool body proximate to said first receiver for receiving signals generated by said first and second transmitters, and wherein said first and second receivers are positioned as a pair and said first and second transmitters are positioned as a pair and wherein said received signals contain propagation properties representative of the formation property; a controller for processing signals received by said first and second receivers; means, operatively associated with said controller, for obtaining dual receiver measurements from the propagation properties; means, operatively associated with said controller, for obtaining dual transmitter measurements from the propagation properties wherein said controller is producing a compensated resistivity measurement of the geologic formation by averaging uncompensated dual-receiver resistivity measurements with uncompensated dual-transmitter resistivity measurements of said geologic formation taken from two selected locations within the borehole.