Neutron borehole logging correction technique

Details Neutron borehole logging correction technique Neutron borehole logging correction technique

1976-07-28

1978-03-07

Dixon, Harold A.

Radiant energy

Coded record and readers; invisible radiant energy type

250256, G01V 500

Patent

active

040781747

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a method and apparatus is disclosed for logging earth formations traversed by a borehole in which an earth formation is irradiated with neutrons and gamma radiation produced thereby in the formation and in the borehole is detected. A sleeve or shield for capturing neutrons from the borehole and producing gamma radiation characteristic of that capture is provided to give an indication of the contribution of borehole capture events to the total detected gamma radiation. It is then possible to correct from those borehole effects the total detected gamma radiation and any earth formation parameters determined therefrom.

REFERENCES:
patent: 2910591 (1959-10-01), Baker
patent: 3065346 (1962-11-01), Dewan et al.
patent: 3772513 (1973-12-01), Hall et al.
patent: 3780303 (1973-12-01), Smith et al.
patent: 3800150 (1974-03-01), Givens

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