Pulsed neutron porosity logging system

Details Pulsed neutron porosity logging system Pulsed neutron porosity logging system

1977-04-20

1978-10-24

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250265, 250269, G01V 500

Patent

active

041223403

ABSTRACT:
An improved pulsed neutron porosity 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 fast neutron detector is moved through a borehole. Repetitive bursts of neutrons irradiate the earth formations and, during the bursts, the fast neutron population is sampled. During the interval between bursts the epithermal neutron population is sampled along with background gamma radiation due to lingering thermal neutrons. The fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity.

REFERENCES:
patent: 3491238 (1970-01-01), Allen
patent: 3509346 (1970-04-01), Mills et al.
patent: 3869608 (1975-03-01), Scherbatskoy
patent: 3947683 (1976-03-01), Schultz et al.

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