Determination of irreducible water cut-off using two dimensional nuclear magnetic resonance data
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United States of America Patent
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May 22, 2012
Grant Date -
Jun 23, 2011
app pub date -
Mar 4, 2011
filing date -
Mar 26, 2008
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Abstract
A method for estimating a distribution of pore sizes of a fluid filled rock formation penetrated by a borehole, the method includes: processing nuclear magnetic resonance (NMR) data to determine a distribution of diffusion coefficients and a distribution of relaxation time constants for at least one depth in the borehole; plotting the distribution of diffusion coefficients and the distribution of relaxation time constants as a cross-plot for the at least one depth; identifying a water line on the cross-plot, each point on the water line having substantially the same value for the diffusion coefficient; and estimating the distribution of pore sizes from the distribution of relaxation time constants plotted along the water line.
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