Defining the Orientation of the15N Shielding Tensor Using15N NMR Relaxation Data for a Protein in Solution

1998 ◽  
Vol 120 (37) ◽  
pp. 9692-9693 ◽  
Author(s):  
Jonathan Boyd ◽  
Christina Redfield
Keyword(s):  
Nmr Relaxation ◽  
Relaxation Data ◽  
Shielding Tensor

Quantitative interpretation of NMR relaxation data

1989 ◽  
Vol 84 (1) ◽  
pp. 134-152 ◽  
Author(s):  
Kenneth P Whittall ◽  
Alexander L MacKay
Keyword(s):  
Nmr Relaxation ◽  
Quantitative Interpretation ◽  
Relaxation Data

scholarly journals Upen2DTool: A Uniform PENalty Matlab tool for inversion of 2D NMR relaxation data

SoftwareX ◽  
2019 ◽  
Vol 10 ◽  
pp. 100302
Author(s):  
V. Bortolotti ◽  
L. Brizi ◽  
P. Fantazzini ◽  
G. Landi ◽  
F. Zama
Keyword(s):  
Nmr Relaxation ◽  
2D Nmr ◽  
Relaxation Data

Joint inversion of nuclear magnetic resonance data from partially saturated rocks using a triangular pore model

Geophysics ◽  
2018 ◽  
Vol 83 (4) ◽  
pp. JM15-JM28 ◽  
Author(s):  
Thomas Hiller ◽  
Norbert Klitzsch
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Joint Inversion ◽  
Nmr Relaxation ◽  
Relaxation Data ◽  
Surface Relaxivity ◽  
Partially Saturated

Measurement of nuclear magnetic resonance (NMR) relaxation is a well-established laboratory/borehole method to characterize the storage and transport properties of rocks due to its direct sensitivity to the corresponding pore-fluid content (water/oil) and pore sizes. Using NMR, the correct estimation of, e.g., permeability strongly depends on the underlying pore model. Usually, one assumes spherical or cylindrical pores for interpreting NMR relaxation data. To obtain surface relaxivity and thus, the pore-size distribution, a calibration procedure by, e.g., mercury intrusion porosimetry or gas adsorption has to be used. Recently, a joint inversion approach was introduced that used NMR measurements at different capillary pressures/saturations (CPS) to derive surface relaxivity and pore-size distribution (PSD) simultaneously. We further extend this approach from a bundle of parallel cylindrical capillaries to capillaries with triangular cross sections. With this approach, it is possible to account for residual or trapped water within the pore corners/crevices of partially saturated pores. In addition, we have developed a method that allows determining the shape of these triangular capillaries by using NMR measurements at different levels of drainage and imbibition. We show the applicability of our approach on synthetic and measured data sets and determine how the combination of NMR and CPS significantly improves the interpretation of NMR relaxation data on fully and partially saturated porous media.

Assigning uncertainties in the inversion of NMR relaxation data

2005 ◽  
Vol 174 (2) ◽  
pp. 314-324 ◽  
Author(s):  
Robert L. Parker ◽  
Yi-Qaio Song
Keyword(s):  
Nmr Relaxation ◽  
Relaxation Data
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