Method and apparatus for complex resistivity measurements with elimination of electromagnetic coupling effects
A method is described of determining the induced polarization response of a formation in which a borehole is disposed, comprising: lowering a logging tool into the borehole, the logging tool having a first set of two electrodes and a second set of two electrodes; conducting a first current between the electrodes of the first set of electrodes and through the formation; detecting with the second set of electrodes a first voltage produced in the formation by the first current; determining a first phase response from the detected first voltage; determining the resistivity of the formation from the conducted first current and the detected first voltage; determining the contact resistances individually of each of the electrodes of the first set of two electrodes and the second set of two electrodes; replacing the first set of two electrodes and the second set of two electrodes with a dummy load simulating the resistivity of the formation and the contact resistances of each of the electrodes; conducting a second current through the dummy load; detecting a second voltage produced in the dummy load by the second current; determining a second phase response from the second detected voltage, the second phase response indicating the electromagnetic coupling; and subtracting the second phase response from the first phase response to obtain a corrected induced polarized response of the formation.
- Assignee:
- Conoco, Inc., Ponca City, OK
- Patent Number(s):
- US 4642570
- OSTI ID:
- 7097531
- Resource Relation:
- Patent File Date: Filed date 25 Mar 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
INDUCED POLARIZATION LOGGING
WELL LOGGING EQUIPMENT
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
BOREHOLES
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRODES
ELECTROMAGNETISM
HOISTING
CAVITIES
CURRENTS
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
EQUIPMENT
GEOLOGIC DEPOSITS
MAGNETISM
MATERIALS HANDLING
MINERAL RESOURCES
PHYSICAL PROPERTIES
RESOURCES
WELL LOGGING
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