Details
| Original language | English |
|---|---|
| Pages (from-to) | 254-261 |
| Number of pages | 8 |
| Journal | Journal of hydrology |
| Volume | 472-473 |
| Publication status | Published - 23 Nov 2012 |
Abstract
X-ray computed tomography (XCT) is a powerful tool for detecting the micro-scale pore structure and has been applied to many natural and synthetic porous media. However, due to the resolution limitations, either non-representative view of the sample or inaccurate results can be produced from the XCT image processing. In this paper, two XCT (micro-CT and CT with synchrotron radiation) with different resolutions of 12.7. μm and 0.35. μm, as well as mercury intrusion porosimetry (MIP) with a minimum detection limit of 3. nm, were used for Berea sandstone to investigate the effect of detecting resolution on the pore structure. Several key pore structure parameters, including porosity, pore size distribution, pore connectivity, surface area, hydraulic radius, and aspect ratio were analyzed in a manner of quantitative comparison between different resolutions of XCT and MIP. The low resolution XCT can capture the large-pore porosity, while overestimates the pore size and pore connectivity. The high resolution XCT is more accurate in describing the pore shape, porosity, pore size; however, it is not representative since narrower detecting pore size range and small volume represented. A representative element volume related to large-pore porosity and probably large-pore connectivity with diameter and height of 2.8. mm is obtained through scale effect analysis. Therefore, selecting an appropriate resolution should be a compromise between the pore size and the representative element volume for the specific property or process of interest.
Keywords
- MIP, Pore structure characterization, Resolution effect, XCT
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Journal of hydrology, Vol. 472-473, 23.11.2012, p. 254-261.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Using X-ray computed tomography in pore structure characterization for a Berea sandstone
T2 - Resolution effect
AU - Peng, Sheng
AU - Hu, Qinhong
AU - Dultz, Stefan
AU - Zhang, Ming
N1 - Funding information: Funding for this project is provided by the University of Texas at Arlington, and by the Subsurface Biogeochemical Research program #DE-SC0005394, Office of Biological and Environmental Research, U.S. Department of Energy, for project ER65073. Synchrotron XCT at the TOMCAT beamline of Paul Scherrer Institute, Villigen, Switzerland was performed with skillful help by Julie Fife and Federica Marone which is gratefully acknowledged. The part related to the work at AIST was conducted under the research contract with the former Nuclear and Industrial Safety Agency (NISA), Japan. We also like to thank EMSL, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory (PNNL). PNNL is operated for DOE by Battelle under contract DE-AC06-76RLO 1830.
PY - 2012/11/23
Y1 - 2012/11/23
N2 - X-ray computed tomography (XCT) is a powerful tool for detecting the micro-scale pore structure and has been applied to many natural and synthetic porous media. However, due to the resolution limitations, either non-representative view of the sample or inaccurate results can be produced from the XCT image processing. In this paper, two XCT (micro-CT and CT with synchrotron radiation) with different resolutions of 12.7. μm and 0.35. μm, as well as mercury intrusion porosimetry (MIP) with a minimum detection limit of 3. nm, were used for Berea sandstone to investigate the effect of detecting resolution on the pore structure. Several key pore structure parameters, including porosity, pore size distribution, pore connectivity, surface area, hydraulic radius, and aspect ratio were analyzed in a manner of quantitative comparison between different resolutions of XCT and MIP. The low resolution XCT can capture the large-pore porosity, while overestimates the pore size and pore connectivity. The high resolution XCT is more accurate in describing the pore shape, porosity, pore size; however, it is not representative since narrower detecting pore size range and small volume represented. A representative element volume related to large-pore porosity and probably large-pore connectivity with diameter and height of 2.8. mm is obtained through scale effect analysis. Therefore, selecting an appropriate resolution should be a compromise between the pore size and the representative element volume for the specific property or process of interest.
AB - X-ray computed tomography (XCT) is a powerful tool for detecting the micro-scale pore structure and has been applied to many natural and synthetic porous media. However, due to the resolution limitations, either non-representative view of the sample or inaccurate results can be produced from the XCT image processing. In this paper, two XCT (micro-CT and CT with synchrotron radiation) with different resolutions of 12.7. μm and 0.35. μm, as well as mercury intrusion porosimetry (MIP) with a minimum detection limit of 3. nm, were used for Berea sandstone to investigate the effect of detecting resolution on the pore structure. Several key pore structure parameters, including porosity, pore size distribution, pore connectivity, surface area, hydraulic radius, and aspect ratio were analyzed in a manner of quantitative comparison between different resolutions of XCT and MIP. The low resolution XCT can capture the large-pore porosity, while overestimates the pore size and pore connectivity. The high resolution XCT is more accurate in describing the pore shape, porosity, pore size; however, it is not representative since narrower detecting pore size range and small volume represented. A representative element volume related to large-pore porosity and probably large-pore connectivity with diameter and height of 2.8. mm is obtained through scale effect analysis. Therefore, selecting an appropriate resolution should be a compromise between the pore size and the representative element volume for the specific property or process of interest.
KW - MIP
KW - Pore structure characterization
KW - Resolution effect
KW - XCT
UR - http://www.scopus.com/inward/record.url?scp=84868300085&partnerID=8YFLogxK
U2 - 10.1016/j.jhydrol.2012.09.034
DO - 10.1016/j.jhydrol.2012.09.034
M3 - Article
AN - SCOPUS:84868300085
VL - 472-473
SP - 254
EP - 261
JO - Journal of hydrology
JF - Journal of hydrology
SN - 0022-1694
ER -