Borehole compensated kut log

Details Borehole compensated kut log Borehole compensated kut log

G - Physics

01

V

358/3

G01V 5/12 (2006.01) G01V 5/06 (2006.01)

Patent

CA 1188429

BOREHOLE COMPENSATED KUT LOG (Docket No. WPC-26) ABSTRACT OF THE DISCLOSURE A method of logging earth formations to ascertain re- lative 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 condition 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 bore- hole from the standard borehole conditions.

403423

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