Method and apparatus for detecting an anomaly in a resistivity m

Details Method and apparatus for detecting an anomaly in a resistivity m Method and apparatus for detecting an anomaly in a resistivity m

1979-06-18

1982-06-15

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324373, 324375, G01V 324

Patent

active

043353533

ABSTRACT:
A method and apparatus are described for detecting the presence of an anomaly, such as the Groningen effect, whereby an error in a resistivity measurement of an earth formation layer is noted when such layer is located below a highly resistive bed. The resistivity is measured with a resistivity measuring sonde with the aid of a reference electrode located between the sonde and a conductive sheath around the cable from which the sonde is suspended in a borehole. A phase sensitive signal is measured and used to detect the presence of an error. In one embodiment, the out-of-phase potential of an electrode is recorded alongside a resistivity measurement as a function of depth. In another embodiment, the out-of-phase potential deviation from a normal value is determined and used to derive a corresponding in-phase potential deviation from which a measurement of the magnitude of the error in the resistivity measurement is made. Other embodiments are shown and described.

REFERENCES:
patent: 2880389 (1959-03-01), Ferre et al.
patent: 2884590 (1959-04-01), Welz
patent: 2933674 (1960-04-01), Schuster
patent: 3068401 (1962-12-01), Janssen
patent: 3462679 (1969-08-01), Attali
patent: 3706025 (1972-12-01), Regat
patent: 3772589 (1973-11-01), Scholberg
Woodhouse, R. "The Laterolog Groningen Phantom Can Cost You Money", SPWLA Nineteenth Annual Logging Symp. Jun. 13-16, 1978, pp. 1-17.

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