Uranium logging in earth formations

Details Uranium logging in earth formations Uranium logging in earth formations

1978-01-12

1979-12-25

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, G01V 500

Patent

active

041807294

ABSTRACT:
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 neutron fluxes produced during the period of time that prompt neutrons are being produced by the neutron fission of uranium in the formations. A borehole calibration tool employs a steady-state (continuous output) neutron source, firstly, to produce a response to neutron fluxes in models having known concentrations of uranium and, secondly, to produce a response to neutron fluxes in the formations surrounding the borehole. The neutron flux responses of the borehole calibration tool in both the model and the formations surrounding the borehole are utilized to correct the neutron flux response of the borehole logging tool for the effects of epithermal/thermal neutron moderation, scattering, and absorption within the borehole itself.

REFERENCES:
patent: 2920204 (1960-01-01), Youmans

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