Determination of the polarity of remanent magnetization of an ea

Details Determination of the polarity of remanent magnetization of an ea Determination of the polarity of remanent magnetization of an ea

1974-07-29

1976-06-22

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01V 300, G01V 318

Patent

active

039654125

ABSTRACT:
In accordance with the present invention, at least the polarity of the direction of the remanent magnetization of an earth formation penetrated by a bore hole is accurately measured utilizing a highly sensitive magnetometer, positioned within the bore hole so as to decrease sensitivity of the instrument to the induced magnetization of the adjacent earth formation while maintaining high resolution for detection of the natural remanent magnetization property of the formation. Preferred logging posture: the magnetometer is positioned such that its response direction is in a plane orthogonal to the earth's normal field in a given azimuthal direction.

REFERENCES:
patent: 2259904 (1941-10-01), McNamee et al.
patent: 2401280 (1946-05-01), Walstrom
patent: 2664542 (1953-12-01), Lynn
patent: 2716730 (1955-08-01), Williams
patent: 3014177 (1961-12-01), Hungerford et al.
patent: 3317821 (1967-05-01), Patton et al.
patent: 3369174 (1968-02-01), Groenendyke et al.
patent: 3391335 (1968-07-01), Patton et al.

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