Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1977-05-19
1979-05-01
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250266, 250269, 250270, G01V 500
Patent
active
041525906
ABSTRACT:
A simultaneous pulsed neutron porosity and thermal neutron capture cross section logging system is provided in the present invention. A logging tool provided with a 14 MeV pulsed neutron source, an epithermal neutron detector, and a combination gamma ray and fast neutron detector is moved through a borehole. Repetitive bursts of neutrons irradiate the earth formations and, during the bursts, the fast neutron and epithermal neutron populations are sampled. During the interval between bursts the thermal neutron capture gamma ray population is sampled in two or more time intervals. The fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity .phi.. The capture gamma ray measurements are combined to provide a simultaneous determination of the thermal neutron capture cross section .SIGMA..
REFERENCES:
patent: 3491238 (1970-01-01), Allen
patent: 3691378 (1972-09-01), Hopkinson et al.
patent: 3869608 (1975-03-01), Scherbatskoy
Schultz Ward E.
Smith Michael P.
Smith, Jr. Harry D.
Beard William J.
Howell Janice A.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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