Method and apparatus for nuclear logging using lithium detector

Details Method and apparatus for nuclear logging using lithium detector Method and apparatus for nuclear logging using lithium detector

1991-11-01

1993-03-23

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, 364422, G01V 510

Patent

active

051966980

ABSTRACT:
A method and apparatus for nuclear logging, and in particular, neutron porosity logging is presented. In accordance with the present invention, a pair of spaced lithium detectors, preferably Li.sup.6 I crystal or Li.sup.6 doped glass are used to detect neutrons emitted from a borehole formation being logged. In addition, novel data processing is used to determine the neutron count from the spectrum developed by the lithium detectors. This novel data processing comprises fitting a Gaussian curve to the neutron peak of the spectrum. The Gaussian curve does not include the hydrogen absorption peak of the spectrum. The area under this Gaussian curve represents the neutron count. Accordingly, a more accurate neutron count is obtained which does not include gamma rays attributed to hydrogen absorption.

REFERENCES:
patent: 3940610 (1976-02-01), Dennis et al.
patent: 4136278 (1979-01-01), Oliver
patent: 4271356 (1981-06-01), Groeschel et al.
patent: 4379229 (1983-04-01), Givens
patent: 4587424 (1986-05-01), Grau

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