Method For Estimation Of Borehole And Formation Properties From Nuclear Logging Measurements

A system for accurate prediction of formation and borehole properties from neutron capture cross section measurements made by a nuclear logging tool, comprising:

• a nuclear logging tool that emits neutrons and performs neutron capture cross section measurements;
• a data storage that stores executable instructions, and a database populated with a plurality of representative neutron capture cross section measurements made by the nuclear logging tool;
• characterized in that:
• a processor that, upon executing the executable instructions stored in the data storage, is configured to:
• construct a mapping function that maps input measurements to one or more properties of interest, wherein the mapping function comprises a linear combination of Gauss radial basis functions;
• and
• determine at least a expansion coefficient and a width of each the Gaussian functions using a database populated with a plurality of representative samples of neutron capture cross section measurements;
• and
• generate at least one predicted value of the property of interest for which the database does not contain a measured value;
• and
• an output interface configured to output the at least one predicted value of the property of interest for which the database does not contain a measured value.