Patent ID: 7495436

Claim:
A method of estimating a value of a property of an earth formation, the method comprising: (a) conveying a nuclear magnetic resonance (NMR) sensing apparatus into a borehole in the earth formation; (b) measuring an NMR echo train indicative of the property from the earth formation; (c) using a predictive model in order to estimate from the measured NMR echo train the value of the property; and (d) recording the estimated value of the property on a computer readable medium; wherein the predictive model is obtained by a regression in which the dependent variable of the regression comprises a matrix of amplitudes of a plurality of NMR echo trains obtained from one of: (i) a plurality of NMR echo trains obtained from a plurality of rock samples, each rock sample having a known value of the property, and (ii) a plurality of simulated NMR echo trains corresponding to a known value of the property, and in which the independent variable of the regression comprises the known value of the property.