1887

Abstract

Summary

Understanding of fault seal is crucial for assessing the storage capacity and leakage risks of a CO2 storage site, as it can significantly impact the project on across-fault and along-fault migration/leakage risking, as well as reservoir pressure predictions. Here we present a case study from Smeaheia offshore Norway to illustrate the importance of fault seal assessment. Leakage risk assessment has been systematically conducted for Smeaheia using the Evidence Support Logic and the Bow-tie methodologies. The results show that the Alpha structure has low across-fault and along-fault leakage risks, thus has a potential value to be added as extra volume for the CO2 storage project. The Beta structure shows large fault-related leakage risks, since it is a 3-way closure juxtaposed to the faulted/fractured Precambrian basement, with large uncertainties of across-fault and along-fault permeabilities of the Øygarden Fault Zone. Fault seal analysis of the relay ramps along the Vette Fault Zone shows that the Smeaheia site can be affected by the pressure drawdown from Troll depletion. However, Smeaheia also has pressure recharging potential from sea bed through Quaternary sediments. Regional dynamic modelling with input from fault seal studies and new pressure measurements can help narrow the storage capacity uncertainty window.

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/content/papers/10.3997/2214-4609.201902319
2019-09-08
2024-03-29
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References

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