TR32-Database: Database of Transregio 32

[1012] - Jointly deriving NMR surface relaxivity and pore size distributions by NMR relaxation experiments on partially desaturated rocks

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Features
Citation
Mohnke, O., 2014. Jointly deriving NMR surface relaxivity and pore size distributions by NMR relaxation experiments on partially desaturated rocks. Water Resources Research, 50 (6), 5309 - 5321. DOI: 10.1002/2014WR015282.
Identification
Title(s):Main Title: Jointly deriving NMR surface relaxivity and pore size distributions by NMR relaxation experiments on partially desaturated rocks
Description(s):Abstract: Nuclear magnetic resonance (NMR) relaxometry is a geophysical method widely used in borehole and laboratory applications to nondestructively infer transport and storage properties of rocks and soils as it is directly sensitive to the water/oil content and pore sizes. However, for inferring pore sizes, NMR relaxometry data need to be calibrated with respect to a surface interaction parameter, surface relaxivity, which depends on the type and mineral constituents of the investigated rock. This study introduces an inexpensive and quick alternative to the classical calibration methods, e.g., mercury injection, pulsed field gradient (PFG) NMR, or grain size analysis, which allows for jointly estimating NMR surface relaxivity and pore size distributions using NMR relaxometry data from partially desaturated rocks. Hereby, NMR relaxation experiments are performed on the fully saturated sample and on a sample partially drained at a known differential pressure. Based on these data, the (capillary) pore radius distribution and surface relaxivity are derived by joint optimization of the Brownstein-Tarr and the Young-Laplace equation assuming parallel capillaries. Moreover, the resulting pore size distributions can be used to predict water retention curves. This inverse modeling approach—tested and validated using NMR relaxometry data measured on synthetic porous borosilicate samples with known petrophysical properties (i.e., permeability, porosity, inner surfaces, pore size distributions)—yields consistent and reproducible estimates of surface relaxivity and pore radii distributions. Also, subsequently calculated water retention curves generally correlate well with measured water retention curves.
Identifier(s):DOI: 10.1002/2014WR015282
Citation Advice:Mohnke, O., 2014. Jointly deriving NMR surface relaxivity and pore size distributions by NMR relaxation experiments on partially desaturated rocks. Water Resources Research, 50 (6), 5309 - 5321. DOI: 10.1002/2014WR015282.
Responsible Party
Creator(s):Author: Oliver Mohnke
Publisher:Wiley Online Library
Topic
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: NMR, Surface Relaxivity, Pore-Size Distribution, Modelling
File Details
File Name:Mohnke_WRR_2014a.pdf
Data Type:Text
Size(s):13 Pages
File Size:1631 kB (1.593 MB)
Date(s):Available: 2014-06-20
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2014
Type:Article
Article Type:Journal
Source:Water Resources Research
Issue:6
Volume:50
Number Of Pages:13
Page Range:5309 - 5321
Metadata Details
Metadata Creator:Tanja Kramm
Metadata Created:2014-09-01
Metadata Last Updated:2014-09-01
Subproject:A2
Funding Phase:2
Metadata Language:English
Metadata Version:V40
Dataset Metrics
Page Visits:178
Metadata Downloads:0
Dataset Downloads:0
Dataset Activity
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