The role of Capillary Hysteresis in Enhancing CO₂ Trapping Efficiency and Storage Stability
- Authors: Khoramian R.1, Pourafshary P.1, Riazi M.1
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Affiliations:
- School of Mining and Geosciences, Nazarbayev University
- Issue: Vol 7, No 1 (2025)
- Pages: 90-99
- Section: Физико-химические и микробиологические исследования
- URL: https://journal-vniispk.ru/2707-4226/article/view/293588
- DOI: https://doi.org/10.54859/kjogi108781
- ID: 293588
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Abstract
Background: The intensifying impact of climate change demands innovative approaches to reduce atmospheric CO₂ levels. Carbon Capture and Storage (CCS) offers a viable solution by sequestering CO₂ in geological reservoirs. However, understanding the role of capillary hysteresis in CO₂ trapping is critical for optimizing CCS performance.
Aim: This study aims to investigate the influence of capillary hysteresis on CO₂ trapping efficiency in saline aquifers using detailed simulation models and varying hysteresis values.
Materials and methods: Advanced CMG simulation software was utilized to model CO₂ injection and migration in saline aquifers spanning depths of 1200–1300 meters. The model, initially saturated with brine, applied water-alternating-gas (WAG) injection at hysteresis values of 0.2, 0.3, 0.4, and 0.5 to evaluate their effect on CO₂ trapping efficiency.
Results: The simulations demonstrated a direct positive correlation between hysteresis values and CO₂ trapping efficiency. At a hysteresis value of 0.5, nearly 100% CO₂ trapping was achieved. This increased efficiency was attributed to stronger capillary forces immobilizing CO₂ more effectively and reducing mobility towards caprock, thereby minimizing leakage risks.
Conclusion: The study highlights the key role of capillary hysteresis in enhancing CO₂ sequestration. Higher hysteresis values improve long-term storage stability, emphasizing the need for optimized WAG injection strategies in CCS applications.
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##article.viewOnOriginalSite##About the authors
Reza Khoramian
School of Mining and Geosciences, Nazarbayev University
Email: reza.khoramian@nu.edu.kz
ORCID iD: 0009-0008-7775-3816
Kazakhstan, Astana
Peyman Pourafshary
School of Mining and Geosciences, Nazarbayev University
Author for correspondence.
Email: peyman.pourafshary@nu.edu.kz
ORCID iD: 0000-0003-4600-6670
Professor
Kazakhstan, AstanaMasoud Riazi
School of Mining and Geosciences, Nazarbayev University
Email: masoud.riazi@nu.edu.kz
ORCID iD: 0000-0002-6843-621X
Associate Professor
Kazakhstan, AstanaReferences
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