Method and system for radioactive assaying

Details Method and system for radioactive assaying Method and system for radioactive assaying

1981-10-13

1984-05-01

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

250262, G01V 510

Patent

active

044463693

ABSTRACT:
A subsurface formation is irradiated with pulsed neutrons and both inelastic scattering and capture gamma-rays are measured in energy level bands characteristic of sulfur and iron. Differentials are determined between such inelastic scattering and capture gamma-rays for both the sulfur and the iron. The iron differential is then compensated by a select multiple of the sulfur differential. The ratio of the compensated iron differential and the sulfur differential is taken as a measure of the pyrite content of the formation.

REFERENCES:
patent: 3780303 (1973-12-01), Smith, Jr. et al.
patent: 3842265 (1974-10-01), Pitts, Jr.
patent: 4066892 (1978-01-01), Givens
patent: 4232220 (1980-11-01), Hertzog
Westaway et al., "The Gamma Spectrometer Tool Inelastic and Capture Gamma-Ray Spectroscopy for Reservoir Analysis", SPE-9461, 55th Annual Fall Tech. Conf. & Ex. of Soc. Petro. Eng. of AIME, Dallas, Sep. 21-24, 1980.

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