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Analysis of rock microstructure after CO2 breakthrough based on CT scanning

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Abstract

The alteration of mudstone’s microscopic properties within the caprock in CO2 geological storage determines the effect of storage. One of the crucial evaluating aspects of storage security is the effect of caprock’s change. Micro-computed tomography (CT) and nano-CT with high accuracy and different resolutions are used to conduct our experiments on Shiqianfeng Formation rocks obtained from the Ordos CO2 capture and storage project. We scan the rock microstructures before and after the breakthrough, compare the changes before and after the breakthrough of CO2, and combine the CT image results after the breakthrough with a numerical simulation technology to analyze the changes in the pore characteristic parameters of the rocks after the breakthrough and evaluate the CO2 sealing capacity of the distribution laws. We present the following results. (1) Pore fluid pressure rises during CO2 breakthrough, opening the connection of some sheet pores and creating micro fractures. (2) The smaller the observation scale, the more substantial the heterogeneity of rock pores. (3) The connection between large pores is tighter and exhibits better connectivity. Meanwhile, the roar channel between small pores is thinner and demonstrates less connectivity. (4) Rock porosity is in the form of approximate normal distribution.

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Data will be made available on request.

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Acknowledgements

The authors acknowledge the financial support provided by National Natural Science Foundation of China (42002258), and Project of East China University of Technology (DHBK2019234), and Open Fund from Engineering Research Center for Geological Environment and Underground Space of Jiangxi Province (GEUS no. JXDHJJ2022-013), and Natural Science Foundation of Shandong Province, (ZR2021QD123).

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Authors and Affiliations

  1. School of Civil and Architecture Engineering, East China University of Technology, Nanchang, 330013, China

    Shuren Hao, Jixiang Cao, Yongqing Jiang & Shengjie Zhang

  2. Engineering Research Center for Geological Environment and Underground Space of Jiangxi Province, East China University of Technology, Nanchang, 330013, China

    Shuren Hao

  3. School of Civil Engineering, Shandong Jianzhu University, **an, 250101, Shandong, China

    Ling Zhou

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Contributions

H.S. wrote the main manuscript text , Z.S. processed the data, J.Y. used software to process 3D display images and C.J. and Z.L. prepared figures 1-17. All authors reviewed the manuscript.

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Correspondence to Jixiang Cao.

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Hao, S., Cao, J., Jiang, Y. et al. Analysis of rock microstructure after CO2 breakthrough based on CT scanning. Environ Earth Sci 83, 436 (2024). https://doi.org/10.1007/s12665-024-11750-8

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