G - Physics – 01 – V
Patent
G - Physics
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G01V 5/00 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1092256
URANIUM LOGGING IN EARTH FORMATIONS Abstract of the Disclosure A technique is provided for assaying the formations surrounding a borehole for uranium. A borehole logging tool cyclically irradiates the formations with neutrons and responds to neutrons during the period of time that prompt neutrons are being produced by the neutron fission of uranium in the forma- tions. A borehole calibration tool employs a steady-state (continuous output) neutron source, firstly, to produce a response to neutrons in models having known concentrations of uranium and, secondly, to produce a response to neutrons in the formations surrounding the borehole. The neutron responses of the borehole calibration tool in both the model and the forma- tions surrounding the borehole are utilized to correct the neutron response of the borehole logging tool for the effects of eptithermal/thermal neutron moderation, scattering, and absorption within the borehole itself. -1-
297419
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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