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A Study of Locally Changing Pore Characteristics and Hydraulic Anisotropy due to Bedding of Porous Sandstone

다공질 사암의 층리에 따른 국부적 공극특성 변화와 수리 이방성 특성

  • Received : 2013.06.10
  • Accepted : 2013.06.27
  • Published : 2013.06.30

Abstract

Anisotropy observed in sedimentary rock such as sandstone is mainly caused by existence of bedding consequently influencing on its hydraulic characteristics. The aim of this study is to investigate the influence of locally changing pore structure due to bedding on the hydraulic anisotropy of sandstone, in terms of localized porosity. X-ray CT scan is applied to observe the internal pore structures which is hard to be seen by other experimental methods. Permeability test is also conducted for samples cored at every $15^{\circ}$ from $0^{\circ}$ to $90^{\circ}$ with respect to bedding plane. As a result, the permeability anisotropy is manifest having 1.8 of anisotropy ratio ($k_{90^{\circ}}/k_{0^{\circ}}$) and corresponds with the anisotropy of porosity due to bedding.

Keywords

Porous sandstone;Hydraulic anisotropy;Permeability;X-ray CT;Porosity

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Cited by

  1. Strength Anisotropy of Berea Sandstone: Results of X-Ray Computed Tomography, Compression Tests, and Discrete Modeling vol.49, pp.4, 2016, https://doi.org/10.1007/s00603-015-0820-0

Acknowledgement

Supported by : 한국에너지기술평가원