Neutron-neutron-logging

Details Neutron-neutron-logging Neutron-neutron-logging

1980-10-10

1983-04-05

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, G01V 500

Patent

active

043792286

ABSTRACT:
A borehole logging tool includes a steady-state source of fast neutrons and three thermal neutron flux detectors. First and second detectors measure the same thermal neutron flux parameter and the third detector measures a different thermal neutron flux measurement. A count rate meter is connected to each thermal neutron flux detector. A first ratio detector provides the ratio of the outputs of the two count rate meters conncted to the first and second detectors measuring the same thermal neutron flux parameter. A second ratio detector provides the ratio of the outputs of the two count rate meters connected to the third detector and one of the first or second detectors. By comparing the signals of the two ratio detectors, oil bearing zones and salt water bearing zones within the formation being logged can be distinguished and porosity can be determined.

REFERENCES:
patent: 3413472 (1968-11-01), Caldwell
patent: 3420998 (1969-01-01), Mills, Jr.
patent: 3491238 (1970-01-01), Allen
patent: 4005290 (1977-01-01), Allen

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