Methods and systems for determining surface relaxivity of a medium using nuclear magnetic resonance
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United States of America Patent
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Nov 21, 2017
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Nov 17, 2014
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Nov 17, 2014
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Abstract
Methods and systems for determining surface relaxivity from nuclear magnetic resonance measurements relate to applying multiple nuclear magnetic resonance (NMR) diffusion editing Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences to the porous medium, wherein the diffusion editing CPMG pulse sequences have a diffusion encoding time Δ; receiving NMR data generated by the pulse sequences; processing the received NMR data to obtain a distribution f(T2,D) for the diffusion encoding time Δ; repeating the applying, the receiving, and the processing at least one time for pulse sequences having different respective diffusion encoding times Δ to obtain respective distributions f(T2,D) corresponding respectively to the different diffusion encoding times Δ; and utilizing the respectively obtained distributions f(T2,D) to generate a surface relaxivity (ρ) determination.
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