1887

Abstract

Summary

Salt precipitation is a critical challenge that can lead to injectivity impairment during CO2 storage in saline aquifers. This study investigates the impact of salt precipitation on the porosity-permeability correlation and its implications for injectivity. Through experimental analysis, we found that even minor salt precipitation can significantly reduce permeability, despite negligible changes in porosity. Berea sandstone, with its smaller pore radius, exhibited a more pronounced reduction in permeability compared to Bentheimer sandstone under the same conditions. Numerical simulations using TOUGH2 revealed that these differences in porosity-permeability correlation substantially affect the injection pressure over time, highlighting the necessity for accurate experimental evaluation of these correlations prior to numerical modeling.

Our findings emphasize the importance of considering the microscopic and petrophysical properties of reservoir rocks in CO2 storage projects. By tailoring injection protocols and selecting appropriate reservoir sites, the risks associated with salt precipitation can be minimized, ensuring the long-term success of CO2 storage operations. This study contributes to a more comprehensive understanding of the interplay between salt precipitation, porosity, and permeability, aiding in the development of more effective CO2 storage strategies to mitigate global warming.

© EAGE Publications BV
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2024-11-04
2026-02-15

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References

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/content/papers/10.3997/2214-4609.202421174
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Impact of Salt Precipitation on Porosity-Permeability Correlations: Implications for CO2 Storage
Conference Proceedings 2024, 1 (2024); https://doi.org/10.3997/2214-4609.202421174
/content/papers/10.3997/2214-4609.202421174
/content/papers/10.3997/2214-4609.202421174
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