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首页> 外文期刊>Transport in Porous Media >Diffusion of Tracer in Altered Tonalite: Experiments and Simulations with Heterogeneous Distribution of Porosity
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Diffusion of Tracer in Altered Tonalite: Experiments and Simulations with Heterogeneous Distribution of Porosity

机译：示踪剂在蚀变方钠石中的扩散：孔隙度非均匀分布的实验和模拟

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摘要

Numerical time-domain-diffusion simulations were used for studying the diffusion behavior of tracer molecules in rock matrix with homogeneous and heterogeneous porosity. As the heterogeneous sample in these simulations, a 3D tomographic image of altered tonalite was used, in which the mineral components and the pores resolved by X-ray microtomography were represented by their respective intragranular porosities determined previously by the 14C-PMMA method. The apparent diffusion coefficient of a tracer in altered tonalite was determined experimentally, and was then used in the simulations. In the altered tonalite analyzed, inclusion of heterogeneity in the porosity increased the diffusion coefficient by 16 %. Altered and pristine feldspar was the main mineral component in the sample (72 %), and it also provided the dominant contribution to tracer diffusion, explaining alone 52 % of the diffusion coefficient. The large pores resolved by microtomography (6 %) and altered and pristine mica (22 %) gave an equal contribution to the diffusion coefficient. The simulation method applied was also validated by comparing the results to both an analytical and a numerical solution to the diffusion equation in a homogenous medium. In addition, the method was compared to discrete-time random-walk simulations in the case of randomly placed overlapping spheres.
机译：数值时域扩散模拟用于研究示踪分子在具有均质和非均质孔隙度的岩石基质中的扩散行为。作为这些模拟中的异质样品，使用了经改变的方钠石的3D断层图像，其中矿物成分和通过X射线断层摄影术解析的孔分别由先前通过14C-PMMA方法确定的各自的颗粒内孔隙度表示。实验确定了示踪剂在改变的方钠石中的表观扩散系数，然后将其用于模拟。在改变后的方钠石中，孔隙中包含非均质性使扩散系数增加了16％。样品中主要的矿物成分是蚀变的和原始的长石（72％），它也对示踪剂的扩散起主要作用，仅解释了52％的扩散系数。通过显微断层照相术分辨的大孔（6％）和原始云母（22％）发生了改变，对扩散系数的贡献相同。通过将结果与均质介质中扩散方程的解析解和数值解进行比较，也验证了所应用的模拟方法的有效性。此外，在随机放置重叠球体的情况下，将该方法与离散时间随机游走仿真进行了比较。

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