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1. (WO2018039054) SIMULTANEOUS INVERSION OF NMR MULTIPLE ECHO TRAINS AND CONVENTIONAL LOGS

Pub. No.:    WO/2018/039054    International Application No.:    PCT/US2017/047504
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Sat Aug 19 01:59:59 CEST 2017
IPC: G01N 24/08
G01N 33/24
Applicants: BAKER HUGHES, A GE COMPANY, LLC
Inventors: ARRO, Julio Roberto
Title: SIMULTANEOUS INVERSION OF NMR MULTIPLE ECHO TRAINS AND CONVENTIONAL LOGS
Abstract:
A method for estimating one or more properties as a function of depth of an earth formation penetrated by a borehole includes: receiving nuclear magnetic resonance (NMR) logging data having NMR echo trains as a function of depth in the borehole; receiving non-NMR logging data having non-NMR measurement values for one or more types of non-NMR measurements as a function of depth in the borehole; generating an evolution matrix (E) representing a mathematical relationship between the one or more properties in property matrix (P) to be estimated and the NMR logging data and non-NMR logging data matrix (M); generating a matrix equation of the form M = E⋅P; and inverting the matrix equation to estimate the one or more properties as a function of depth.