Effects of CO2 geosequestration on opalinus clay.

Asim, Taimoor; Hawez, Haval Kukha

Abstract

CO2 geosequestration is an important contributor to United Nations Sustainable Development Goal 13, i.e., Climate Action, which states a global Net-Zero CO2 emissions by 2050. A potential impact of CO2 geosequestration in depleted oil and gas reservoirs is the variations in induced pressure across the caprocks, which can lead to significant local variations in CO2 saturation. A detailed understanding of the relationship between the pressure gradient across the caprock and local CO2 concentration is of utmost importance for assessing the potential of CO2 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 CO2 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 CO2 concentration in Opalinus Clay. Well-validated numerical results indicate favourable sub-critical CO2 geosequestration under a positive pressure gradient across Opalinus Clay. In the absence of a positive pressure gradient, a peak CO2 concentration of 5% has been recorded, which increases substantially (above 90%) as the pressure gradient across the sample increases.

Citation

ASIM, T. and HAWEZ, H.K. 2024. Effects of CO2 geosequestration on opalinus clay. Energies [online], 17(10), article number 2431. Available from: https://doi.org/10.3390/en17102431

• Journal Article Type: Article
• Acceptance Date: May 16, 2024
• Online Publication Date: May 19, 2024
• Publication Date: May 31, 2024
• Deposit Date: May 27, 2024
• Publicly Available Date: May 27, 2024
• Journal: Energies
• Electronic ISSN: 1996-1073
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 17
• Issue: 10
• Article Number: 2431
• DOI: https://doi.org/10.3390/en17102431
• Keywords: Opalinus clay; Computational fluid dynamics; Finite element analysis; CO2 geosequestration
• Public URL: https://rgu-repository.worktribe.com/output/2344833