PULSED NEUTRON-NEUTRON LOGGING METHOD Russian patent published in 2019 - IPC G01V5/10 

FIELD: chemistry.

SUBSTANCE: use: for pulsed neutron-neutron logging. Summary of invention consists in the fact that irradiating rock with pulsed flow of fast neutrons, recording time distributions of thermal and epithermal neutron fluxes, charging a charge formed in at least one detector of thermal neutrons by the flux of neutrons incident on it from the beginning of the neutron pulse to the beginning of the next neutron pulse, additionally thereby providing registration time distribution of a charge caused by fast neutrons, as well as recording time distributions of epithermal and thermal neutron fluxes at the recorded events rate, leading to miscalculations in the counting recording mode, storing the obtained charge time distribution, repeating registration process for N ≥ 1 neutron pulses, each subsequent charge time distribution is summed with stored, comparing the obtained time distribution with set of time distributions from database, previously calculated for borehole instrument at different humidity rock, well parameters, flushing fluid and certified by measuring time distributions charge using said method on geophysical rock models, in the database there is found a time distribution corresponding to the recorded time distribution by comparison criteria, humidity rock, parameters wells, flushing fluid considered to coincide with humidity mine rock, well and flushing fluid parameters used in calculation of time distribution, corresponding to registered time distribution.

EFFECT: technical result: improving measurement accuracy of rock moisture content by measuring time distribution of charge formed in at least one thermal neutron detector, additionally thereby providing registration time distribution of a charge caused by fast neutrons, as well as registration time distributions of epithermal and thermal fluxes at the frequency of recorded events leading to miscalculations in the counting recording mode.

1 cl, 3 dwg