The Neutron Lifetime Log provides a sensitive and accurate means of monitoring progressive changes which take place in hydrocarbon reservoirs by intercomparing logs run in individual selected wells at different times. The principles involved in monitor logging are discussed and applications of the method are considered. The effects of borehole parameters on "pulsed neutron" logging are discussed and it is shown by test results that the Neutron Lifetime Log is superior in this regard. The use of a neutron detector as proposed in the Russian literature is shown to produce a log which is influenced to a greater extent by borehole conditions.

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