公开(公告)号：US10324225B2

公开(公告)日：2019-06-18

申请号：US15174074

申请日：2016-06-06

Applicant: BAKER HUGHES INCORPORATED

Inventor： David M. Chace ,  Rafay Zahid Ansari ,  Feyzi Inanc ,  W. Allen Gilchrist ,  Michael W. Bruner

IPC: G01V5/10

Abstract: Borehole logging methods for estimating a parameter of interest using nuclear radiation. Methods include estimating a water saturation of the formation from gamma radiation from at least the formation detected in the borehole using a radiation detector, the gamma radiation responsive to a pulsed neutron source and resulting from at least one of: (i) decay of nitrogen-16 formed by activation of oxygen-16, and ii) inelastic scattering of neutrons from oxygen. This may include using at least one processor to: obtain a gamma ray count measurement, representing gamma rays from one of (i) the decay of nitrogen-16 (ii) and the inelastic scattering, and estimate the water saturation using the gamma ray count measurement and a model comprising a relationship between measured gamma ray counts and modeled gamma ray counts from each of a fully water saturated formation and a minimally water saturated formation.