Processing method of natural gamma ray well logging data

Details Processing method of natural gamma ray well logging data Processing method of natural gamma ray well logging data

G - Physics

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358/3

G01V 5/00 (2006.01) G01V 5/06 (2006.01)

Patent

CA 1073119

21.498 CLAY CONTENT DETERMINATION BY NATURAL GAMMA RAY SPECTROMETRY ABSTRACT OF THE DISCLOSURE In accordance with an illustrative embodiment of the present INVENTION, a technique is provided for automatically processing measurements of the total natural gamma radioactivity and the thorium, uranium, potassium contents of formations sur- rounding a borehole to obtain a representation of the clay con- tent of said formations in a zone of the borehole where the presence of one of said elements, called a disturbing element, is not related to clay. First, reference values of the total radioactivity and the thorium, uranium, potassium contents in the zone are determined. Then, at least two of these measure- ments are combined in accordance with a function determined from the reference values to produce a representation of the clay content of the formations corrected for the effect of the dis- turbing element.

272597

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