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On the Validity of the Relationship 1/T = 1/T B+1/T S+1/T D in NMR Techniques With Regards to Permeability Estimation of Natural Porous Media

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dc.contributor.author Díaz-Curiel, J.
dc.contributor.author Biosca, B.
dc.contributor.author Arévalo-Lomas, L.
dc.contributor.author Miguel, M.J.
dc.contributor.author Loayza Muro, Raul Augusto
dc.date.accessioned 2021-12-12T20:24:59Z
dc.date.available 2021-12-12T20:24:59Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/20.500.12866/10293
dc.description.abstract One of the most relevant feature of geophysical techniques based on nuclear magnetic resonance is their ability to estimate the permeability of natural porous media, since other geophysical techniques, as the use of the formation factor and neutron well-logs, allow to quantify the volume of water in the media. Permeability is conventionally obtained from decay time of the total resonance signal. However, the fluid in the pores of a medium normally has different mobility degree that can be differentiated by the NMR results. Therefore, a detailed estimation of permeability requires decomposing the total resonance signal as a function of the decay times corresponding to the three mechanisms that contribute to the signal: the intergranular free fluid, the surface layer, and the diffusion relaxation mechanism. The relationship currently used to make this decomposition states that the exponential decay rate attributed to the total resonance signal is the sum of the three existing decay rates. We demonstrate that this relationship is not generally applicable in porous media, showing the contradiction with the much more widely accepted relationships as well as computation examples from three typical decay rates in a single pore and from sandstone with bulk and surface relaxation mechanisms. Consequently, we conclude that the assertion whereby the permeability of any porous medium does not depend on the decay time of the free fluid is an overstatement, since it only applies to very small pore sizes en_US
dc.language.iso eng
dc.publisher Frontiers Media
dc.relation.ispartofseries Frontiers in Earth Science
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject bulk en_US
dc.subject decay rates en_US
dc.subject Diffusion in liquids en_US
dc.subject Exponential decay rates en_US
dc.subject Formation factor en_US
dc.subject free fluid en_US
dc.subject Geophysical techniques en_US
dc.subject Geophysics en_US
dc.subject Mobility degrees en_US
dc.subject Neutron logging en_US
dc.subject Nuclear magnetic logging en_US
dc.subject Nuclear magnetic resonance en_US
dc.subject nuclear-magnetic-resonance en_US
dc.subject permeability en_US
dc.subject Permeability estimation en_US
dc.subject Pore size en_US
dc.subject Porous materials en_US
dc.subject Relaxation mechanism en_US
dc.subject Relevant features en_US
dc.subject Resonance signals en_US
dc.subject Textures en_US
dc.title On the Validity of the Relationship 1/T = 1/T B+1/T S+1/T D in NMR Techniques With Regards to Permeability Estimation of Natural Porous Media en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.3389/feart.2021.688686
dc.relation.issn 2296-6463


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