Neutron-neutron logging for both porosity and macroscopic absorp

Details Neutron-neutron logging for both porosity and macroscopic absorp Neutron-neutron logging for both porosity and macroscopic absorp

1975-08-18

1977-05-03

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, G01V 500

Patent

active

040216667

ABSTRACT:
A borehole logging tool includes a fast neutron source and at least two thermal neutron detectors spaced apart from the source. A count rate meter is connected to each thermal neutron detector. A 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. A comparison unit provides a signal indicative of the macroscopic absorption cross section of the formation by comparing the indicated porosity with at least one of the count rate signals.

REFERENCES:
patent: 3462600 (1969-08-01), Dewan
patent: 3491238 (1970-01-01), Allen
patent: 3567935 (1971-03-01), Nagel
patent: 3567936 (1971-03-01), Tittman
patent: 3691378 (1972-09-01), Hopkinson et al.
patent: 3906224 (1975-09-01), Scott et al.
patent: 3914603 (1975-10-01), Paap et al.

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