2002
DOI: 10.1021/jp011884r
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Relaxation of Protons in Pores in a Sandstone

Abstract: Proton nuclear magnetic spin−spin relaxation time distributions (T 2 distributions) for a water-saturated cylinder of sandstone (radius 6.5 cm and length 17.55 cm) have been studied as a function of drying time. By freezing the sample to −13.7 °C, a proportionality constant of 38.8 μs/nm was determined that can be used to relate pore size to T 2. The results show external water cannot enter some intermediate sized pores of 400 nm diameter; however, these pores are available to water that has been frozen and al… Show more

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Cited by 3 publications
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“…Here, bulk relaxation is an inherent property of the fluid caused by molecular movement and molecular interactions, whereas in surface relaxation, a magnetized molecule is demagnetized by the solid rock surface. , T 2,diffusion is minimal and can be neglected since the background magnetic field gradients which arise due to the susceptibility differences between the fluid and the rock matrix are minimal. Therefore, surface and bulk relaxations are considered to be the dominant modes of relaxations; the measured relaxation spectrum is a combination of these two parameters …”
Section: Resultsmentioning
confidence: 99%
“…Here, bulk relaxation is an inherent property of the fluid caused by molecular movement and molecular interactions, whereas in surface relaxation, a magnetized molecule is demagnetized by the solid rock surface. , T 2,diffusion is minimal and can be neglected since the background magnetic field gradients which arise due to the susceptibility differences between the fluid and the rock matrix are minimal. Therefore, surface and bulk relaxations are considered to be the dominant modes of relaxations; the measured relaxation spectrum is a combination of these two parameters …”
Section: Resultsmentioning
confidence: 99%