Determination of remanent magnetization of an earth formation pe

Details Determination of remanent magnetization of an earth formation pe Determination of remanent magnetization of an earth formation pe

1974-09-05

1978-12-12

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

364422, G01V 300, G01V 318

Patent

active

041298217

ABSTRACT:
In accordance with the present invention, the remanent magnetization of an earth formation penetrated by a bore hole is accurately indicated even in the presence of high solar and atmospheric disturbance affecting the earth's normal field. A highly sensitive magnetometer is positioned within the bore hole in a direction S at a plurality of logging stations within the bore hole. Although at each station the response measured includes contributions other than that associated with the remanent magnetization of the formation, such other components can be easily isolated and removed from the measured response of each logging station, such removal processes including accounting for changes in the earth's normal field waveform (micropulsation effects) using waveform migration techniques as provided by a properly programmed digital computer.

REFERENCES:
patent: 3014177 (1961-12-01), Hungerford et al.
patent: 3187252 (1965-06-01), Hungerford
patent: 3317821 (1967-05-01), Patton et al.
patent: 3369174 (1968-02-01), Groenendyke et al.
patent: 3391335 (1968-07-01), Patton et al.
patent: 3402348 (1968-09-01), Hoehn et al.

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