Measurement of subsurface formation lithology, including...

Details Measurement of subsurface formation lithology, including... Measurement of subsurface formation lithology, including...

G - Physics

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G01V 5/00 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1050173

MEASUREMENT OF SUBSURFACE FORMATION LITHOLOGY, INCLUDING COMPOSITION AND FLUIDS, USING CAPTURE GAMMA SPECTROSCOPY (D#73,561-FB) ABSTRACT OF THE DISCLOSURE Gamma ray spectra of earth formations surrounding an open or cased well borehole are obtained by exciting sub- surface formation elements around the borehole with neutrons and detecting the gamma ray resulting from capture in the subsurface formation of thermalized neutrons from a capture gamma spectroscopy (C.G.S.) well log source. The spectra of gamma rays so obtained are analyzed to form logs of the elements which contribute significantly to the spectra. From these logs, quantitative measurements of the primary formation parameters of formation water salinity, water sat- uration, porosity, major matrix components and ratios of formation constituents of the earth formations are obtained. I

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