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Compaction and clay content control mudrock porosity

Author

Listed:
  • Rezaeyan, Amirsaman
  • Kampman, Niko
  • Pipich, Vitaliy
  • Barnsley, Lester C.
  • Rother, Gernot
  • Magill, Clayton
  • Ma, Jingsheng
  • Busch, Andreas

Abstract

Mudrocks, ubiquitous yet poorly understood sedimentary rocks with significant variations in composition and physical properties, form seals for geological carbon dioxide and energy (e.g., hydrogen and methane) storage, repositories for radioactive waste disposal, and reservoirs for natural gas. Understanding the controls on mudrock pore structure is essential for evaluating their porosity. The identification and quantification of controls depend on the nano-to micron scale pore network, which are the subject of this study. Small-angle (SANS) and very small-angle neutron scattering (VSANS) experiments were conducted on 13 diverse mudrock sets, characterised by differences in mineralogy, stratigraphy, maturity, and depositional environment. We performed multivariate statistics to systematically characterise the pore structure in 71 samples cross a 5 μm–2 nm pore size range. Our results indicate a multivariate approach more effectively captures the complex controls on porosity rather than single parameters. Compaction and clay content emerge as key primary and secondary controls on mudrock porosity, respectively, upon which we introduce a new porosity classification. Our complementary experimental-statistical assessment involving SANS-derived multiscale porosity sheds new light on the influence of structural controls on storage or production capacity in mudrocks.

Suggested Citation

  • Rezaeyan, Amirsaman & Kampman, Niko & Pipich, Vitaliy & Barnsley, Lester C. & Rother, Gernot & Magill, Clayton & Ma, Jingsheng & Busch, Andreas, 2024. "Compaction and clay content control mudrock porosity," Energy, Elsevier, vol. 289(C).
    • Handle: RePEc:eee:energy:v:289:y:2024:i:c:s0360544223033601
    DOI: 10.1016/j.energy.2023.129966
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    References listed on IDEAS

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    1. Yujie Yuan & Reza Rezaee, 2019. "Comparative Porosity and Pore Structure Assessment in Shales: Measurement Techniques, Influencing Factors and Implications for Reservoir Characterization," Energies, MDPI, vol. 12(11), pages 1-14, May.
    2. Li, Baibing & Martin, Elaine B. & Morris, A. Julian, 2002. "On principal component analysis in L1," Computational Statistics & Data Analysis, Elsevier, vol. 40(3), pages 471-474, September.
    3. Ma, Lin & Dowey, Patrick J. & Rutter, Ernest & Taylor, Kevin G. & Lee, Peter D., 2019. "A novel upscaling procedure for characterising heterogeneous shale porosity from nanometer-to millimetre-scale in 3D," Energy, Elsevier, vol. 181(C), pages 1285-1297.
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