Nmr log processing using wavelet filter and iterative inversion

Details Nmr log processing using wavelet filter and iterative inversion Nmr log processing using wavelet filter and iterative inversion

G - Physics

01

V

G01V 3/38 (2006.01) G01R 33/44 (2006.01) G01V 3/32 (2006.01) G01R 33/46 (2006.01)

Patent

CA 2287654

A method of nuclear magnetic resonance (NMR) well log processing. A wavelet decomposition of an NMR echo train is performed. The resulting small scale coefficients, which may be discretely or continuously indexed by scale, in alternative embodiments, are windowed, and a first reconstruction generated therefrom by inverse wavelet transformation. The reconstructed signal is inverted and fit to a multiexponential model. Further refinements may be generated by iteratively decomposing the fitted signal at a preselected maximum scale, increasing at each iteration, generating a new coefficient by replacing the corresponding portion of the previous coefficient with the coefficient at the current scale, reconstructing the signal with the new coefficient, and fitting the signal so reconstructed to the relaxation time distribution.

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