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Influence of Mineralogy on Rock Mechanical Behaviour Considering Dynamic Alteration Damage Caused by SC-CO2: A Comparative Study on Different Rock Types

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Abstract

Currently, the inability to master the damage law of reservoir rock is one of the major obstacles to the efficient development of geological resources using supercritical carbon dioxide (SC-CO2), and the key issue is the unknown influence mechanism of mineral dissolution on the altered reservoir strength. Therefore, the aim of this study was to reveal the influence mechanism of mineralogy on rock mechanical behaviour by conducting a SC-CO2 dynamic alteration study. By analysing the correlation between mineral evolution and mechanical damage, the controlling effect of insoluble minerals on altered strength and the dominant effect of the highest reaction order minerals on damage rate were revealed. Under the dynamic alteration effect, the dissolution of soluble minerals is weakened and the spallation of insoluble minerals is promoted. An evaluation index, the ISR, was proposed to show significantly positive correlation with the altered strength, whose effect is similar to the content of insoluble minerals. A modification method for the alteration damage laws of different types of rocks was proposed, indicating that the mechanical damage should be considered more severe for sandstone and granite, and slighter for marble. On this basis, the mineral characteristics of the rocks, which can be severely damaged under SC-CO2 alteration, are preliminarily proposed.

Highlights

  • Mineral effects on intact rock strength are also applicable to altered rock strength.

  • Considering dynamic alteration effect, the dissolution of soluble minerals is weakened and the spallation of insoluble minerals is promoted.

  • The strength-controlling effect of insoluble minerals is found on altered rocks, and the highest reaction order mineral mainly affects damage rate.

  • An evaluation index, the ISR, is proposed to evaluate the change trend of altered strength with high reliability.

  • Dynamic alteration damage is more severe for rocks dominated by insoluble minerals and slighter for rocks dominated by soluble minerals.

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Acknowledgements

Current investigations are supported by the Key Research and Development Plan of Shandong Province (2019JZZY010427) and the National Key Research and Development Project (2019YFC1805402-1). In addition, this manuscript was edited for English language by American Journal Experts (AJE).

Funding

This work was funded by Key Technology Research and Development Program of Shandong (Grant no. 2019JZZY010427); National Key Research and Development Project (CN) (Grant no. 2019YFC1805402-1).

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Correspondence to Xiao Zhang.

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An, Q., Zhang, Q., Zhang, X. et al. Influence of Mineralogy on Rock Mechanical Behaviour Considering Dynamic Alteration Damage Caused by SC-CO2: A Comparative Study on Different Rock Types. Rock Mech Rock Eng 55, 3129–3151 (2022). https://doi.org/10.1007/s00603-022-02807-w

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  • DOI: https://doi.org/10.1007/s00603-022-02807-w

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