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首页> 外文会议>Symposium on the Application Of Geophysics To Engineering And Environmental Problems >A PHYSICS-DRIVEN APPROACH USING SINGLE-PORE-MODES (SPM) FOR ESTIMATING AN AVERAGE PORE RADIUS AND SURFACE RELAXIVITY FROM NMR DATA
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A PHYSICS-DRIVEN APPROACH USING SINGLE-PORE-MODES (SPM) FOR ESTIMATING AN AVERAGE PORE RADIUS AND SURFACE RELAXIVITY FROM NMR DATA

机译：使用单孔模式（SPM）的物理驱动方法，用于估计来自NMR数据的平均孔径和表面松弛率

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The method of Nuclear Magnetic Resonance (NMR) has found a wide range of application in geophysics. At the largest scale SNMR as a surface based method covers volumes up to thousands of cubic meters, at laboratory scale NMR can handle samples as small as cuttings from drilling. Here we focus on unconsolidated material with the purpose to derive hydraulic properties from NMR relaxation curves at laboratory scale. Until now several methods for fitting NMR data are used. All approaches utilize a mono-, multi- or stretched-exponential relationship to explain NMR decay curves. Brownstein and Tarr (1979) showed that even for single pores a decay curve composes of several mono-exponential modes which superimposes to a multi-exponential signal. Thus, common multi-exponential approaches can lead to a misinterpretation of the decay time spectrum, when purely seen as a pore radius distribution. The mono-exponential modes introduced by Brownstein and Tarr (1979) occur by solving the general diffusion equation, which can be calculated for different pore geometries. In this study we used a cylindrical geometry to describe the pore space in analogy to Kozeny (1927). Thus, the solution is given for decay times T, extended by a term for the bulk relaxation and intensities I by equation 1 and 2.
机译：核磁共振（NMR）的方法在地球物理中发现了广泛的应用。在最大量表SNMR，作为基于表面的方法，覆盖数量高达数千立方米的，在实验室标度下，NMR可以处理像钻孔的切割一样小的样品。在这里，我们专注于未计算的材料，目的是在实验室规模处从NMR松弛曲线获得液压性质。到目前为止，使用了几种用于拟合NMR数据的方法。所有方法都利用单，多或拉伸指数关系来解释NMR衰减曲线。 Brownstein和Tarr（1979）表明，即使是单个孔隙，也衰减曲线组成几种单一指数模式，该模式叠加到多指数信号。因此，当纯粹被视为孔半径分布时，常见的多指数方法可能导致衰减时间谱的误解。通过求解一般扩散方程，通过求解棕褐色和Tarr（1979）引入的单指数模式，这可以针对不同的孔隙几何形状来计算。在这项研究中，我们使用圆柱几何形状来描述与Kozeny（1927）类似的孔隙空间。因此，求解衰减时间T，通过等式1和2延伸到散装弛豫和强度I的术语。

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