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首页> 外文会议>International Symposium of the Society of Core Analysts >NMR MAGIC ANGLE SAMPLE SPINNING FOR MEASURING WATER AND HEAVY OIL SATURATION AND HIGH RESOLUTION RELAXOMETRY
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NMR MAGIC ANGLE SAMPLE SPINNING FOR MEASURING WATER AND HEAVY OIL SATURATION AND HIGH RESOLUTION RELAXOMETRY

机译：NMR魔法角度样品纺丝测量水和重油饱和度和高分辨率弛豫

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摘要

Nuclear magnetic resonance(NMR)relaxometry and/or diffusion measurements can be used to distinguish oil and water fractions in rocks containing low density oils because the relaxation rates and diffusivities of the oil and water are significantly different.However,when core samples contain high density oils,the oil and water relaxation rates are indistinct and diffusion differences too small for straightforward saturation determination.Additionally,high density oils can have complicated T1 and T2 distributions as well as a relaxation time constants that are too short to measure with low field relaxometry.We show the utility of using magic angle spinning(MAS)to remove the susceptibility broadening of the rock matrix,making possible the resolution of the proton chemical shift.We have used MAS measurements to determine water and oil saturations in diatomite samples containing oils with API gravity ranging from ~10 to 27.The MAS measurements yield determinations of the oil and water saturations and estimates of the aromaticity of the oil,and extend relaxometry by obtaining separate T1’s,Carr-Purcell and Hahn-Echo T2’s of oil and water.The relaxation parameters thus obtained are not independent of spinning,and are discussed in the light of the relevant theory regarding MAS and field dependence.The MAS measurements at either 500 or 100 MHz 1H frequencies require only about 150 mg sample with experiment times of a few minutes.Non-MAS spectra of the samples were also acquired at 20 MHz,as were liquidstate spectra of the extracted oils at 500,100,and 20 MHz.
机译：核磁共振（NMR）弛豫和/或扩散测量可用于区分含有低密度油的岩石中的油和水分，因为油和水的松弛率和扩散性显着不同。然而，当核心样品含有高密度时油，油和水松弛率是模糊的，扩散差异太小，不能直接饱和测定。加法，高密度油可以具有复杂的T1和T2分布以及太短的弛豫时间常数，以通过低场弛豫测量。我们展示了使用魔法角度旋转（MAS）去除岩石基质的易感性扩大的效用，使得质子化学换档的分辨率成为可能。我们使用MAS测量来确定含有API的油脂的硅藻土样品中的水和油状物。重力范围从〜10到27。MAS测量的产量确定油和水域通过获得单独的T1的羧基和哈姆回波T2的油和水，延伸油脂的芳香性和延伸弛豫率和延伸。如此获得的弛豫参数与旋转无关，并且鉴于旋转而讨论关于MAS和场依赖性的相关理论。500或100MHz 1H频率的MAS测量只需要约150mg样品，实验时间为几分钟。样品的NON-MAS光谱也在20MHz时获得，如液体甾钛提取的油的光谱在500,100和20MHz。

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