Application of X-ray CT Method to Permeability Tests of Rock under Low Pressure Condition

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  • 岩石の低圧透水試験へのＸ線ＣＴ法の適用
  • ガンセキ ノ テイアツ トウスイ シケン エ ノ Xセン CTホウ ノ テキヨウ

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Abstract

X-ray Computed Tomography (CT) is successfully applied to the visualization of water infiltration into dry rock, and to the quantitative determination of the permeability in rock. A multi-stage pressurization procedure is applied to a one-dimensional horizontal water infiltration test under low pressure conditions, and in which the volumetric water content at each point within a rock specimen is precisely monitored by means of X-ray CT. Case examples make clear that the subtraction of X-ray CT images is an effective procedure available for the flow field analysis dependent on the pore structure. Applying the Green-Ampt model, the coefficient of permeability and water entry pressure was evaluated. The result was consistent with the pore size distribution obtained by the mercury intrusion porosimeter.

Journal

  • Journal of MMIJ

    Journal of MMIJ 126 (7), 401-407, 2010

    The Mining and Materials Processing Institute of Japan

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