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.

Orsolya Gelencsér

Zsuzsanna Szabó-Krausz

Tibor Németh

Csaba Árvai

László Tamás Mika

Ákos Kővágó

Dániel Breitner

Péter Tóth

György Falus

Földtani Közlöny

Foldtani Kozlony

K-feldspar – H2 interaction in the context ofunderground hydrogen storage

地下氢储存背景下钾长石与氢气的相互作用

K-feldspar – H2 interaction in the context ofunderground hydrogen storage

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