Patent ID: 6630357
Filing Date: 2003-10-07
Classification: G01N,Y10T

Abstract:
A method of determining the composition of a sample comprising bitumen or heavy oil and water in a porous media, said method comprising the steps of:(a) determining the NMR T2 relaxation time spectrum of the same at a first low temperature; (b) heating the sample to a second elevated temperature; (c) determining the NMR T2 relaxation time spectrum of the sample at the elevated temperature; (d) creating a differential spectrum by subtracting a signal amplitude (A Low) of the low temperature spectrum from a signal amplitude (A High) of the elevated temperature spectrum to determine a differential amplitude (&Dgr;A); (e) determining the water content by summing the amplitudes of the low temperature spectrum for the T2 range where 2.5 ms (f) determining the heavy oil or bitumen content by summing (i) the amplitudes of the elevated temperature spectrum in the T2 range where, in the differential spectrum, &Dgr;A has a negative value; and (ii) the amplitudes of the differential spectrum where &Dgr;A has a positive value; and (iii) dividing byte amplitude index (AI) of heavy oil or bitumen at the elevated temperature.â€