Method for induced polarization logging

Details Method for induced polarization logging Method for induced polarization logging

1986-02-24

1987-04-14

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324373, 364422, G01V 324, G01V 338

Patent

active

046582150

ABSTRACT:
An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out amplifier and voltage-controlled resistances to provide zero potential difference between pairs of monitoring electrodes. The measured current and voltage are digitized downhole and transmitted to the surface. At the surface means are provided for determining in-phase and quadrature response.

REFERENCES:
patent: 3902113 (1975-08-01), Bridges et al.
patent: 4359687 (1982-11-01), Vinegar et al.
patent: 4398151 (1983-08-01), Vinegar et al.
patent: 4583046 (1986-04-01), Vinegar et al.

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