SIMULTANEOUS INVERSION OF NMR MULTIPLE ECHO TRAINS AND CONVENTIONAL LOGS

摘要

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.