Effects of CO 2 Geosequestration on Opalinus Clay

Taimoor Asim () and Haval Kukha Hawez
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Taimoor Asim: School of Engineering, Robert Gordon University, Aberdeen AB10 7GJ, UK
Haval Kukha Hawez: School of Engineering, Robert Gordon University, Aberdeen AB10 7GJ, UK

Energies, 2024, vol. 17, issue 10, 1-13

Abstract: CO 2 geosequestration is an important contributor to United Nations Sustainable Development Goal 13, i.e., Climate Action, which states a global Net-Zero CO 2 emissions by 2050. A potential impact of CO 2 geosequestration in depleted oil and gas reservoirs is the variations in induced pressure across the caprocks, which can lead to significant local variations in CO 2 saturation. A detailed understanding of the relationship between the pressure gradient across the caprock and local CO 2 concentration is of utmost importance for assessing the potential of CO 2 geosequestration. Achieving this through experimental techniques is extremely difficult, and thus, we employ a coupled Computational Fluid Dynamics (CFD) and Finite Element Method (FEM) based solver to mimic sub-critical CO 2 injection in Opalinus Clay under various pressure gradients across the sample. The geomechanical and multiphase flow modelling utilising Darcy Law helps evaluate local variations in CO 2 concentration in Opalinus Clay. Well-validated numerical results indicate favourable sub-critical CO 2 geosequestration under a positive pressure gradient across Opalinus Clay. In the absence of a positive pressure gradient, a peak CO 2 concentration of 5% has been recorded, which increases substantially (above 90%) as the pressure gradient across the sample increases.

Keywords: Opalinus Clay; Computational Fluid Dynamics; Finite Element Analysis; CO 2 geosequestration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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