Low field 1H NMR relaxometry and multivariate data analysis in crude oil viscosity prediction

This study explores the application of multivariate data analysis in the viscosity prediction of crude oils using NMR relaxation data. The H-1 transverse relaxation times (T-2) of 68 Brazilian crude oil samples, ranging from light to extra-heavy (2 to 30,0000), were measured at 2 MHz. Partial least squares regression (PLSR) models were developed to predict the oil viscosity in log viscosity units from the T-2 relaxation spectra and directly from the raw relaxation curves. In both cases, the PLSR with only three latent variables produced good calibration models, with a standard error of prediction of 0.161 and 0.135 logcP for the T-2 relaxation spectra and raw relaxation curves, respectively. The PLSR models were validated by full cross and external set schemes revealing quite equivalent performances. (C) 2009 Elsevier B.V. All rights reserved.