Borehole compensated density logs corrected for naturally occurr

Details Borehole compensated density logs corrected for naturally occurr Borehole compensated density logs corrected for naturally occurr

1982-11-24

1985-07-16

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, G01V 500

Patent

active

045298777

ABSTRACT:
A method for measuring formation density is disclosed. It provides a corrected gamma gamma-type density log having a correction for the adverse effects of gamma radiation from thorium, uranium and potassium ore bodies. The adjacent formation is irradiated with gamma radiation preferably from a cesium (Cs.sup.137) source which emits gamma radiation at 0.663 Mev. Two differently longitudinally spaced detectors are used, a short spaced detector and a long spaced detector. A gamma ray spectrum observed at one of the detectors is broken down into four energy windows across the spectrum and count rate signals are determined and corrected to separate the naturally occurring gamma radiation from the scattered gamma radiation. This information may then be combined with count rate information from the other detector, thereby yielding a compensated density log corrected from naturally occurring gamma rays.

REFERENCES:
patent: 3321625 (1967-05-01), Wahl
patent: 4048495 (1977-09-01), Ellis
patent: 4297575 (1981-10-01), Smith, Jr. et al.

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