Neutron-neutron logging

Details Neutron-neutron logging Neutron-neutron logging

1978-10-23

1981-08-25

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

250266, 250269, G01V 500

Patent

active

042861500

ABSTRACT:
A borehole logging tool includes a steady-state source of fast neutrons, two thermal neutron detectors, and two gamma ray detectors. A count rate meter is connected to each neutron detector. A first ratio detector provides the ratio of the outputs of the two count rate meters connected to the two thermal neutron detectors. A second ratio detector provides the ratio of the outputs of the two count rate meters connected to the two gamma ray 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: 2776378 (1957-01-01), Youmans
patent: 3514598 (1970-05-01), Youmans
patent: 4005290 (1977-01-01), Allen
patent: 4021666 (1977-05-01), Allen

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