Estimating T2-diffusion probability density functions from...

Electricity: measuring and testing – Particle precession resonance – Using well logging device

Reexamination Certificate

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C324S307000, C702S012000

Reexamination Certificate

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08044662

ABSTRACT:
In some embodiments, apparatus and systems, as well as methods, may operate to acquire data representing a plurality of nuclear magnetic resonance (NMR) echo trains associated with a material, such as a geological formation. Additional operations may include inverting a model of at least one of the plurality of NMR echo trains to provide an estimated distribution of transverse relaxation time constants, inverting models of selected ones of the plurality of NMR echo trains using the estimated distribution of transverse relaxation time constants to provide an estimated diffusion distribution, and inverting a model of selected ones of the plurality of NMR echo trains, using the estimated distributions of transverse relaxation time constants and diffusion, to provide an apparent and an intrinsic probability density function to identify fluid types in the material.

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“International Application No. PCT/US06/21973, International Search Report mailed Jun. 22, 2007”, 2 pgs.
“International Application No. PCT/US06/21973, Written Opinion mailed Jun. 22, 2007”, 8 pgs.

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