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Effects of Supercritical CO 2 Treatment Temperatures on Mineral Composition, Pore Structure and Functional Groups of Shale: Implications for CO 2 Sequestration

Author

Listed:
  • Yugang Cheng

    (National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China)

  • Mengru Zeng

    (School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Zhaohui Lu

    (National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China)

  • Xidong Du

    (State Key Laboratory of Nuclear Resources and Environment, School of Earth Sciences, East China University of Technology, Nanchang 330013, China)

  • Hong Yin

    (Engineering Research Centre for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China)

  • Liu Yang

    (National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China)

Abstract

Research on the physicochemical reactions between supercritical carbon dioxide (Sc-CO 2 ) and shale at different temperature is essential for geological CO 2 sequestration. In this paper, shale from the Longmaxi formation in Sichuan basin of China was collected to study the changes in mineral composition, pore structure, and organic functional groups treated with Sc-CO 2 at fixed pressure 8 MPa and temperatures 40 °C to 80 °C. Samples were analyzed with x-ray diffraction, CO 2 /N 2 gas adsorption, and Fourier transform infrared spectroscopy. The results show that the dissolution of clay minerals by Sc-CO 2 first declined, but then increased when the temperature increased; dissolution reached a minimum at 60 °C. The specific surface area, total pore volume, predominant pore type (mesopores), and fractal dimension of the shale pore structure first increases and then decreases with increasing temperature. The destruction of hydroxyl structures by Sc-CO 2 is related to the destruction of OH–N and ring hydroxyls. As the temperature increases, the hydroxyl destruction first increases and then decreases. The aromatic hydrocarbons are mainly dominated by 3H and 2H, and their abundances increase significantly as temperature increases, whereas the 4H shows a decreasing trend; the 1H abundance does not change appreciably. The relative abundances of aromatic and aliphatic hydrocarbons decrease linearly as the temperature increases. These research results provide theoretical support for the geological storage of Sc-CO 2 in shale at different temperatures.

Suggested Citation

  • Yugang Cheng & Mengru Zeng & Zhaohui Lu & Xidong Du & Hong Yin & Liu Yang, 2020. "Effects of Supercritical CO 2 Treatment Temperatures on Mineral Composition, Pore Structure and Functional Groups of Shale: Implications for CO 2 Sequestration," Sustainability, MDPI, vol. 12(9), pages 1-22, May.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:9:p:3927-:d:356584
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    References listed on IDEAS

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