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Investigating the dependence of proton T₁ relaxation on pore size, pore fluid salinity, and pore fluid pH in water-wet sand packs Kanters, William Andrew
Abstract
The dependence of the proton nuclear magnetic resonance parameter, T₁ on surface wettability, grain size, and pore fluid chemistry was investigated using laboratory prepared silica sand packs. A pulsed proton NMR spectrometer, with a proton Larmour frequency of 90 MHz, was used to obtain the T₁ relaxation data. Pore fluid T₁ data were found to be dependent on the surface wettability of the sand packs. An observed difference in T₁ of approximately 1 second was obtained between 100% water-wet and 100% oil-wet sand packs, when the pH of the pore fluid was neutral. This difference in T₁ between the water-wet and oil-wet samples when saturated with distilled water, was observed for a range of different pore sizes. T₁ relaxation time was found to depend on sand pack grain size in both the water-wet and oil-wet samples. This indicated the presence of surface relaxation in the samples. Calculated surface relaxivities produced average values of 1.2 x 10-₃ cm/s and 2.6 x lO-₄ cm/s for the water-wet and the oil-wet samples respectively. Pore fluid chemistry was found to affect T₁ relaxation measurements in water-wet and oil-wet sand packs. Experimental results indicated that although T₁ was unaffected by pore fluid salinity it was dependent on the pore fluid pH. Results showed that as pore fluid acidity increased, T₁ relaxation times decreased in both the water-wet and the oil-wet sand packs. This enhanced relaxation at lower pH's was attributed to increased pore fluid relaxation at the grain surfaces.
Item Metadata
Title |
Investigating the dependence of proton T₁ relaxation on pore size, pore fluid salinity, and pore fluid pH in water-wet sand packs
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1996
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Description |
The dependence of the proton nuclear magnetic resonance parameter, T₁ on
surface wettability, grain size, and pore fluid chemistry was investigated using laboratory
prepared silica sand packs. A pulsed proton NMR spectrometer, with a proton Larmour
frequency of 90 MHz, was used to obtain the T₁ relaxation data. Pore fluid T₁ data were
found to be dependent on the surface wettability of the sand packs. An observed
difference in T₁ of approximately 1 second was obtained between 100% water-wet and
100% oil-wet sand packs, when the pH of the pore fluid was neutral. This difference in
T₁ between the water-wet and oil-wet samples when saturated with distilled water, was
observed for a range of different pore sizes. T₁ relaxation time was found to depend on
sand pack grain size in both the water-wet and oil-wet samples. This indicated the
presence of surface relaxation in the samples. Calculated surface relaxivities produced
average values of 1.2 x 10-₃ cm/s and 2.6 x lO-₄ cm/s for the water-wet and the oil-wet
samples respectively.
Pore fluid chemistry was found to affect T₁ relaxation measurements in water-wet
and oil-wet sand packs. Experimental results indicated that although T₁ was unaffected
by pore fluid salinity it was dependent on the pore fluid pH. Results showed that as
pore fluid acidity increased, T₁ relaxation times decreased in both the water-wet and the
oil-wet sand packs. This enhanced relaxation at lower pH's was attributed to increased
pore fluid relaxation at the grain surfaces.
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Extent |
4875811 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-06
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0052490
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1996-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.