Borehole compensated KUT log

Details Borehole compensated KUT log Borehole compensated KUT log

1981-05-21

1984-03-13

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250262, G01V 500

Patent

active

044369964

ABSTRACT:
A method of logging earth formations to ascertain relative elemental abundancies of potassium (K), uranium (U) and thorium (T) is disclosed. A natural gamma ray spectrum of an unknown borehole is compared with individual standard gamma ray spectra of potassium, uranium and thorium in at least four energy ranges or bands. Decay peaks of the three elements are encompassed by three of the energy bands and at least one other energy band is used to monitor the changes in shape of the unknown spectrum caused by borehole conditions differing from that of the standard or calibration boreholes. A function derived from the gamma ray count rates in the four bands is used to compensate the elemental abundancies of the three elements to be detected in the unknown spectrum for the effects of differing borehole conditions in the unknown borehole from the standard borehole conditions.

REFERENCES:
patent: 3940610 (1976-02-01), Dennis et al.
patent: 3976878 (1976-08-01), Chevalier et al.
patent: 4187908 (1980-02-01), Fertl et al.
patent: 4271356 (1981-06-01), Groeschel et al.

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