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Spatial heterogeneity length scales in carbonate rocks

机译：碳酸盐岩空间异质性长度尺度

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Spatially resolved distributions of T-2 relaxation times in carbonate rocks are measured with slice-selective multiple spin echo magnetic resonance imaging to study the length scales of heterogeneity in these samples. Single-voxel Carr-Pureell-Mciboom-Gill decays are fit to double exponential functions, and the results of those fits are combined into a histogram. We describe a novel qualitative method of assessing the importance of different length scales of heterogeneity, involving comparing various aspects of these histograms to the full-core T2 distributions. Using this technique, it is found that almost all individual voxels relax not only with more than one time constant but indeed with a range of relaxation times that approximates the full breadth of relaxation times for the entire core, indicating significant subvoxel heterogeneity. In addition, different voxcls are found to exhibit relaxation times that differ by orders of magnitude, indicating significant heterogeneity between the scale of a voxel (1 min) and that of the entire core (several centimeters). These results reflect the importance of a broad range of length scales of heterogeneity in these carbonate rocks.
机译：用切片选择性多重自旋回波磁共振成像技术测量碳酸盐岩中T-2弛豫时间的空间分辨分布，以研究这些样品中异质性的长度尺度。将单体素Carr-Pureell-Mciboom-Gill衰减拟合为双指数函数，并将这些拟合的结果合并为直方图。我们描述了一种新颖的定性方法，用于评估不同长度尺度的异质性的重要性，其中涉及将这些直方图的各个方面与全核T2分布进行比较。使用这种技术，发现几乎所有单个体素不仅以一个以上的时间常数松弛，而且实际上以一系列的松弛时间接近整个核心的整个松弛时间，表明明显的亚体素异质性。此外，发现不同的voxcls表现出的弛豫时间相差几个数量级，表明体素的比例（1分钟）和整个核心的比例（几厘米）之间存在显着的异质性。这些结果反映了这些碳酸盐岩中广泛的非均质长度尺度的重要性。

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