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A radiation transmission technique for the spatially-resolved measurement of porosity and diffusion properties of porous media.

机译：一种用于空间分辨测量多孔介质的孔隙率和扩散特性的辐射传输技术。

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摘要

This thesis investigated experimentally the diffusion properties of geologic media. A gamma-radiation transmission device was developed and optimized, to measure, as a function of time, the spatial distribution of the concentration of a potassium iodide (KI) tracer as it diffuses in the pore space of sedimentary rocks. The design of the device was optimized for samples of 25 mm in thickness, to provide a spatial resolution of 1 mm 2, and to allow the scanning of samples 80 mm x 40 mm in frontal area, with an acquisition time of one-second per point.;Experimental measurements were conducted on samples of dolomite and sandstone from cores obtained from Guelph, Ontario and Moncton, New Brunswick. The spatial distribution of diffusion-accessible porosity, &phis;d, was calculated from the acquired dry and KI-saturated scans. Relative concentration profiles for KI tracer were determined by calibration, and the pore diffusion coefficient, Dp, for each sample was calculated by fitting a one-dimensional analytical solution to the experimental data. Results indicated that one of the dolomite samples and a sandstone rock sample displayed near uniform Dp values. A second dolomite sample was found to exhibit variability in Dp values, which was attributed to its porosity heterogeneity. The results of this work showed that the developed radiation device was capable of providing spatial porosity and tracer concentration information that is useful in characterizing the transport of solute in geological media.
机译：本文通过实验研究了地质介质的扩散特性。开发并优化了一种伽马辐射传输设备，以测量随时间变化的碘化钾（KI）示踪剂在沉积岩孔隙中的扩散时的浓度空间分布。该设备的设计针对厚度为25 mm的样品进行了优化，以提供1 mm 2的空间分辨率，并允许在正面区域扫描80 mm x 40 mm的样品，每秒钟采集时间为一秒对来自安大略省圭尔夫和新不伦瑞克省蒙克顿的岩心的白云岩和砂岩样品进行了实验测量。从获得的干扫描和KI饱和扫描中计算出扩散可及的孔隙度φd的空间分布。通过校准确定KI示踪剂的相对浓度曲线，并通过将一维分析溶液拟合至实验数据来计算每个样品的孔扩散系数Dp。结果表明，白云岩样品和砂岩样品之一显示出接近均匀的Dp值。发现第二个白云岩样品表现出Dp值的变化，这归因于其孔隙率的非均质性。这项工作的结果表明，开发的辐射装置能够提供空间孔隙度和示踪剂浓度信息，可用于表征溶质在地质介质中的传输。

著录项

  • 作者

    Subudhi, Ranjit K.;

  • 作者单位

    University of New Brunswick (Canada).;

  • 授予单位 University of New Brunswick (Canada).;
  • 学科 Geology.;Geophysics.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 79 p.
  • 总页数 79
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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