NEUTRON BURST TIMING METHOD AND SYSTEM FOR MULTIPLE MEASUREMENT PULSED NEUTRON FORMATION EVALUATION

摘要

A method is disclosed for measuring neutron interaction properties of an earthformation.The method includes irradiating the formation with bursts of high energyneutrons. Thebursts have a duration selected to enable detection of short duration burstrelated phenomena.After at least one of the bursts, short duration burst related phenomena aremeasured. After aselected number of the bursts, long duration neutron burst-related phenomenaare detected.In some embodiments, the short duration burst related phenomena include atleast one ofinelastic gamma ray related phenomena, neutron slowing down related phenomenaand shortcapture cross section related phenomena.