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Seismic-Driven Coupled Multiphase Flow and Geomechanics for Risk Assessment of Luna CO2 Storage Site, North Sea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Sixth EAGE Global Energy Transition Conference & Exhibition (GET 2025), Oct 2025, Volume 2025, p.1 - 5
Abstract
Summary
Inclusive evaluation of geomechanical risks is critical to ensuring the reliability of geological carbon storage. While poromechanics has long established the relationship between injection-induced pore pressure changes and potential rock failure, managing the large-scale geomechanical risks linked to CO2 injection into deep saline aquifers remains a key hurdle for its broader adoption in the global transition to net-zero emissions. In this study, we explore the mechanical behaviour of the Luna saline aquifer in the North Sea under CO2 injection through integrated simulations that couple multiphase flow with geomechanics, based on a seismic-driven high-fidelity static model. Our findings indicate a surface uplift of approximately 13 mm after two decades of continuous injection at 1.5×106 m3/day (equivalent to 1 Mt/year), a level deemed safe for offshore infrastructure. Furthermore, our analysis reveals maximum shear stress level (SSL) and tensile stress level (TSL) of 0.5 and 0.78, respectively, in both the reservoir and the overlying caprock. Given that stress levels under 0.8 are considered safe thresholds, our results imply a low probability of gas injection-induced mechanical failure, reinforcing the integrity of the caprock and supporting the long-term feasibility of CO2 storage in this setting.
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