Dual guard logging apparatus

Details Dual guard logging apparatus Dual guard logging apparatus

G - Physics

01

V

324/9

G01V 3/18 (2006.01) G01V 3/24 (2006.01)

Patent

CA 1104651

ABSTRACT A method and apparatus is disclosed wherein simultane- ous logs may be made at different lateral distances through a formation from a borehole by guard electrode systems located on a sonde which is lowered into the borehole by a logging cable. A single oscillator controls the frequency of two formation currents flowing through the formation at the desired different lateral depths from the borehole. The armor of the logging cable acts as the current return for one of the guard electrode systems, and a cable elec- trode in a cable electrode assembly immediately above the logging sonde acts as the current return for the second guard electrode system. Two embodiments are also disclosed for measuring reference voltages between electrodes in the cable electrode assembly and the guard electrode systems.

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