Determination of water saturation in subsurface earth formations

Details Determination of water saturation in subsurface earth formations Determination of water saturation in subsurface earth formations

1977-12-27

1980-03-04

Anderson, Bruce C.

Radiant energy

Coded record and readers; invisible radiant energy type

250269, G01V 500

Patent

active

041918843

ABSTRACT:
Gamma ray spectra of earth formations surrounding a well borehole are obtained by bombarding the formations with neutrons from a pulsed neutron source and detecting the gamma rays resulting from capture of thermalized neutrons in the formation using a germanium gamma ray detector. A measure of the ratio of chlorine to hydrogen is obtained from the detected gamma radiation spectra, and the apparent formation water salinity is determined from the chlorine/hydrogen ratio. The water saturation of the formation is then obtained from the apparent formation water salinity and the true formation water salinity. Compensation is made for the presence of saline water in the borehole fluid and in the cement annulus, as well as for any bound water in the formation.

REFERENCES:
patent: 3219820 (1965-11-01), Hall
patent: 3240938 (1966-03-01), Hall
patent: 4002903 (1977-01-01), Pitts et al.

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