Method for determining thermal neutron decay times of earth form

Details Method for determining thermal neutron decay times of earth form Method for determining thermal neutron decay times of earth form

1974-07-17

1976-02-24

Borchelt, Archie R.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250262, 250391, G01V 500

Patent

active

039406113

ABSTRACT:
A method is disclosed for measuring the thermal neutron decay time of earth formations in the vicinity of a well borehole. A harmonically intensity modulated source of fast neutrons is used to irradiate the earth formations with fast neutrons at three different intensity modulation frequencies. The tangents of the relative phase angles of the fast neutrons and the resulting thermal neutrons at each of the three frequencies of modulation are measured. First and second approximations to the earth formation thermal neutron decay time are derived from the three tangent measurements. These approximations are then combined to derive a value for the true earth formation thermal neutron decay time.

REFERENCES:
patent: 3133195 (1964-05-01), Jones et al.
patent: 3171961 (1965-03-01), Yule
patent: 3638484 (1972-02-01), Tixier

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