Neutron-neutron logging

Details Neutron-neutron logging Neutron-neutron logging

1975-06-25

1977-01-25

Dixon, Harold A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250261, 250269, G01V 500

Patent

active

040052907

ABSTRACT:
A borehole logging tool includes a steady-state source of fast neutrons, two epithermal neutron detectors, and two thermal neutron detectors. A count rate meter is connected to each neutron detector. A first ratio detector provides an indication of the porosity of the formation surrounding the borehole by determining the ratio of the outputs of the two count rate meters connected to the two epithermal neutron detectors. A second ratio detector provides an indication of both porosity and macroscopic absorption cross section of the formation surrounding the borehole by determining the ratio of the outputs of the two count rate meters connected to the two thermal neutron 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 the amount of oil saturation can be determined.

REFERENCES:
patent: 2776378 (1957-01-01), Youmans
patent: 3491238 (1970-01-01), Allen
patent: 3532884 (1970-10-01), Dewan
patent: 3567936 (1971-03-01), Tittman

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