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Abstract

Summary

Creep deformation affects both stiffness and permeability. Clay-rich sandstones are expected to show some degree of creep deformation that might be enhanced/moderated by mineral dissolution during CO injection. We conducted a series of triaxial creep experiments on Kentucky, Colton, and Parker sandstones. We used 1% NaCl brine as the pore fluid during the triaxial creep experiments, before and after injection of CO. We recorded the axial and radial strain data, measured the elastic moduli (i.e., bulk modulus, Young’s modulus, and Poisson’s ratio) and permeability. We observed no significant change in bulk modulus when CO was injected, while the Young’s modulus decreased after CO injection. In all the cases, viscoelastic/creep deformation led to an increase in Young’s modulus while causing a continuous decrease in permeability. We observed a positive correlation between the creep strain and permeability change during creep.

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/content/papers/10.3997/2214-4609.202522058
2025-09-01
2026-02-08

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Creep-Induced Alterations of Permeability and Stiffness During CO2 Injection
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202522058
/content/papers/10.3997/2214-4609.202522058
/content/papers/10.3997/2214-4609.202522058
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