1887

Abstract

Summary

This study investigates the interaction of hydrogen with shale caprock in the presence of various brines under different reservoir conditions, emphasizing contact angle as an indicator of wettability. Two types of brine were utilized: one simulating high-salinity conditions closer to Middle Eastern fields, and the other with reduced salinity, approximating the Lehen reservoir in Austria, a location previously evaluated for hydrogen storage. Contact angle measurements were conducted using a high-pressure, high-temperature goniometer and the captive bubble method to analyze hydrogen’s behavior at the rock-brine interface.

The findings indicate that elevated pressure amplifies the water-wet characteristics of the caprock, particularly in the low-salinity brine from Lehen, which consistently yielded greater contact angles. This indicates that hydrogen is less prone to dispersal on the rock surface in such settings, promoting enhanced brine adhesion—an essential characteristic for reliable subsurface hydrogen storage. Conversely, temperature exerted a negligible influence on wettability. The research emphasizes that the ionic composition of the brine, especially the prevalence of sodium or potassium ions, influences changes in wettability.

The findings points out the significance of brine chemistry and reservoir pressure in maintaining caprock integrity, crucial for the secure and enduring storage of hydrogen in geological formations.

© EAGE Publications BV
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2025-10-27
2026-01-22

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/content/papers/10.3997/2214-4609.202521149
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Hydrogen Behaviour in Geological Formations: Insights into Cap Rock-Fluid Interactions
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202521149
/content/papers/10.3997/2214-4609.202521149
/content/papers/10.3997/2214-4609.202521149
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