Abstract
Brown and Fatt1 have found that the nuclear thermal relaxation time, T1 for water protons in contact with sand is shorter than for bulk water and is increased by placing an organic film on the surface. They have suggested that the enhanced relaxation arises from strong local magnetic fields caused by paramagnetic centres on the surface. The film would then act as a physical shield. The KST model2 describes the effect of such paramagnetic centres as 
where T1 is the observed relaxation time; TB, the bulk relaxation time ; Vs, the volume of fluid near the surface relaxing with rate rs ; and VB, the volume of fluid relaxing at the bulk rate3.
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References
Brown, R. J. S., and Fatt, I., Trans. Amer. Inst. Min. and Met. Eng., 207, 262 (1956).
Korringa, J., Seevers, D. O., and Torrey, H. C., Phys. Rev., 127, 1143 (1962). See also Torrey, H. C., Korringa, J., Seevers, D. O., and Uebersfeld, J., Phys. Rev. Lett., 3, 418 (1959).
Seevers, D. O., Logging Symp. Trans., 7 (1966).
Brown, R. J. S., and Gamson, B. W., Trans. Amer. Inst. Min. and Met. Eng., 219, 199 (1960).
Moilliet, J. L., Collie, B., and Black, W., Surface Activity, 110 (D. van Nostrand Co., Inc., Princeton, 1961)
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DEVEREUX, O. Effect of Crude Oil on the Nuclear Magnetic Relaxation of Water Protons in Sandstone. Nature 215, 614–615 (1967). https://doi.org/10.1038/215614a0
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DOI: https://doi.org/10.1038/215614a0
