K-feldspar – H2 interaction in the context of underground hydrogen storage

Gelencsér, Orsolya and Szabó-Krausz, Zsuzsanna and Németh, Tibor and Árvai, Csaba and Mika, László Tamás and Kővágó, Ákos and Breitner, Dániel and Tóth, Péter and Falus, György (2024) K-feldspar – H2 interaction in the context of underground hydrogen storage. FÖLDTANI KÖZLÖNY, 154 (3). pp. 267-276. ISSN 0015-542X (nyomtatott); 2559-902X (online)

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Abstract

Geologic reservoirs, including sandstones, can serve as sites for underground hydrogen storage (UHS). However, for a successful commercial application, a more detailed knowledge of the rock–pore-water–hydrogen gas (H2) systems is necessary. In this combined experimental-modeling study, the geochemical impact of H2 on K-feldspar was investigated. Static batch reactor experiments were conducted under pressure and temperature conditions of potential UHS to track the effect of H2 on K-feldspar. The experimental data show a negligible reactivity of K-feldspar. The kinetic PHREEQC model predicts the dissolution of K-feldspar to a similar extent as suggested by the experimental observations. Findings of this study show that the K-feldspar–H2 interaction is marginal. The results mark clear progress in understanding the chemical changes in polymineralic reservoir rock matrix during hydrogen injection processes.

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