NDLI: Calculating absolute permeability using nuclear magnetic resonance models

Content Provider	Springer Nature Link
Author	Lala, Amir Maher Sayed El Sayed, Nahla Abd El Moktader
Copyright Year	2015
Abstract	1D transverse relaxation measurements were made on fully cylindrical cores of sandstone sediments with varying values of porosity, pore size and magnetic susceptibility. Porosity calculated from amplitudes of transverse relaxation measurements agrees well with porosity determined by independent method. Transverse relaxation measurements within the homogeneous magnetic field can be used for permeability prediction. In the case of sandstone samples with high porosity, a standard calculation scheme from NMR logging in the oil industry yields good results. However, standard SDR (Schlumberger Doll Research) model based on the T2LM cannot be applied for an accurate permeability prediction for samples with low porosity, small pore sizes, clay filling pores, and presence of iron minerals and associated with high internal magnetic field gradients. Therefore, a model theory was developed physically based on Kozeny-Carman equation, which describes the pore radius dependence of the surface relaxivity ρ as both an analytical and a more practicable empirical equation was applied. Regarding corrected ρ values, permeability can be predicted more accurately from the physically based Kozeny-Carman equation than from the logarithmic mean of the T2 distribution. From the relaxation measurements new empirical models with high coefficient of correlation by MLS regression were derived, additionally the coefficients of SDR and Kozeny were reestimated. The prediction models were applied, and the results compared to absolute permeability results from basic core analysis. As expected, the Kozeny model response presented better match to the core permeability values when compared with the optimized SDR.
Starting Page	7955
Ending Page	7960
Page Count	6
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	10
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-02-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Porosity Transverse relaxation measurements NMR logging Schlumberger Doll Research model Surface relaxivity Kozeny-Carman equation Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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