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Transport in Porous Media

, Volume 110, Issue 1, pp 157–169 | Cite as

A Sensitivity Study of the Effect of Image Resolution on Predicted Petrophysical Properties

  • Nayef Alyafei
  • Ali Qaseminejad Raeini
  • Adriana Paluszny
  • Martin J. Blunt
Article

Abstract

Micro-CT scanning is a nondestructive technique that can provide three-dimensional images of rock pore structure at a resolution of a few microns. We compute petrophysical properties on three-dimensional images of benchmark rocks: two sandstones (Berea and Doddington) and two limestones (Estaillades and Ketton). We take scans at a voxel size of approximately 2.7 \(\upmu \hbox {m}\) and with \(1024^3\) voxels for both sandstone and limestone rocks. We numerically upscale the images to image sizes of \(512^3, 256^3\) and \(128^3\), representing voxel sizes of around 5.4, 10.8, and 21.6 \(\upmu \hbox {m}\) respectively, covering the same domains with coarser resolution. We calculate porosity and permeability on these images by using direct simulation and by extracting geometrical equivalent networks. We find that the predicted porosity is fairly insensitive to resolution for sandstones studied with the selected range of resolutions but sensitive for limestones with lower porosity for larger voxel sizes. For the permeability predictions, we do not observe a clear trend in permeability as a function of voxel size; however, sandstones, roughly, have comparable permeability regardless of the voxel size. On the other hand, for limestones, we generally see a decreasing trend in permeability as a function of upscaled voxel size.

Keywords

Pore-scale modeling Image resolution Petrophysics Micro-CT Upscaling 

Notes

Acknowledgments

We would like to acknowledge funding from the Qatar Carbonates and Carbon Storage Research Centre, QCCSRC, which is supported jointly by Qatar Petroleum, Shell and the Qatar Science and Technology Park.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Nayef Alyafei
    • 1
  • Ali Qaseminejad Raeini
    • 1
  • Adriana Paluszny
    • 1
  • Martin J. Blunt
    • 1
  1. 1.Department of Earth Science and EngineeringImperial College LondonLondonUK

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