Neutron borehole logging correction technique

Details Neutron borehole logging correction technique Neutron borehole logging correction technique

G - Physics

01

V

358/4

G01V 5/00 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1051125

NEUTRON BOREHOLE LOGGING CORRECTION TECHNIQUE ABSTRACT OF THE DISCLOSURE In accordance with an illustrative embodiment of the present invention, a method and apparatus is disclosed for log- ging 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 cor- rect from those borehole effects the total detected gamma radia- tion and any earth formation parameters determined therefrom. -1-

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