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Upscaling the permeability properties using multiscale X-ray-CT images with digital rock modeling and deep learning techniques
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  • Fei Jiang,
  • Yaotian Guo,
  • Takeshi Tsuji,
  • Yoshitake Kato,
  • Mai Shimokawara,
  • Lionel Esteban,
  • Mojtaba Seyyedi,
  • Marina Pervukhina,
  • Maxim Lebedev,
  • Ryuta Kitamura
Fei Jiang
Yamaguchi University

Corresponding Author:[email protected]

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Yaotian Guo
Yamaguchi University
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Takeshi Tsuji
University of Tokyo
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Yoshitake Kato
JOGMEC
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Mai Shimokawara
JOGMEC
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Lionel Esteban
CSIRO-Energy, Oil, Gas & Fuels program
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Mojtaba Seyyedi
CSIRO
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Marina Pervukhina
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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Maxim Lebedev
Curtin University
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Ryuta Kitamura
JOGMEC
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Abstract

This study presents a workflow to predict the upscaled absolute permeability of the rock core direct from CT images whose resolution are not sufficient to allow direct pore-scale permeability computation. This workflow exploits the deep learning technique with the data of raw CT images of rocks and their corresponding permeability value obtained by performing flow simulation on high resolution CT images. The permeability map of a much larger region in the rock core is predicted by the trained neural network. Finally, the upscaled permeability of the entire rock core is calculated by the Darcy flow solver, and the results showed a good agreement with the experiment data. This proposed deep-learning based upscaling method allows estimating the permeability of large-scale core samples while preserving the effects of fine-scale pore structure variations due to the local heterogeneity.