METHOD AND APPARATUS FOR DUAL-SPACED FAST/EPITHERMAL NEUTRON POROSITY MEASUREMENTS

摘要

METHOD AND APPARATUS FOR DUAL-SPACED FAST/EPITHERMALNEUTRON POROSITY MEASUREMENTSAbstract of the DisclosureAn earth formation is irradiated with fastneutrons (18), and the formation porosity is deter-mined by a dual-spaced fast/epithermal neutron meas-urement in which the fast neutron population is meas-ured at a different source-detector spacing (20) thanthat used for measuring the epithermal neutron popu-lation (40).