Pulsed neutron porosity logging method and apparatus using dual

Details Pulsed neutron porosity logging method and apparatus using dual Pulsed neutron porosity logging method and apparatus using dual

1977-09-01

1979-10-09

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, 250270, G01V 500

Patent

active

041707320

ABSTRACT:
A source of fast neutrons and two differently spaced detectors are utilized in a well logging instrument, each of such detectors being responsive to the thermal neutron population decay rate. The inverse of this decay rate is proportional to the measured macroscopic absorption cross section (Sigma). The measured Sigma is obtained simultaneously as a function of the radiation detected by each of two detectors. The signal generated which is indicative of the Sigma observed from one detector is subtracted from the Sigma observed by the second detector. The difference between the measured Sigma from two differently spaced detectors provides a unique function of the fluid-filled porosity of the formations giving rise to the measured Sigma values.

REFERENCES:
patent: 4004147 (1977-01-01), Allen

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