Hydrogen-Induced Alteration of Sulfide Minerals in Fine-Grained Sedimentary Rocks
水素による微粒子堆積岩中の硫化物鉱物の変質 (AI 翻訳)
Madison Tarpley, Jennifer Rubalcaba, Tyler Garza, Maggie Izumi, I. Oyeniyi, Arun J. Bhattacharjee, H. Lisabeth, Benjamin Gilbert, Liaosha Song
🤖 gxceed AI 要約
日本語
本研究では、水素地中貯蔵（UHS）の実現可能性評価のため、堆積岩中の硫化物鉱物と水素の反応性を調査。カリフォルニアのモントレー層から採取したキャップロック試料を用い、ナノCTと地球化学モデリングにより、パイライト結晶の溶解と空隙率の増加を確認した。これは長期的な水素貯蔵の安全性に重要な知見を提供する。
English
This study investigates hydrogen reactivity with sulfide minerals in caprocks for underground hydrogen storage (UHS). Using a sample from the Monterey Formation, nano-CT and geochemical modeling reveal pyrite dissolution and increased porosity after H2 exposure. These findings are crucial for assessing long-term security of hydrogen storage sites.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では水素社会の実現に向けた水素貯蔵技術の開発が進められており、本研究成果は国内の枯渇油ガス田を利用したUHSの評価に直接的な示唆を与える。特に、キャップロックの長期安定性評価に貢献する。
In the global GX context
As hydrogen emerges as a key vector for decarbonization, understanding the geochemical reactivity of hydrogen with reservoir and caprock minerals is critical for large-scale storage. This study provides experimental evidence of hydrogen-induced mineral alteration, informing risk assessments for global UHS projects.
👥 読者別の含意
🔬研究者:Geochemists studying hydrogen reactivity with minerals will find direct experimental data and modeling confirming dissolution mechanisms.
🏢実務担当者:Energy companies evaluating depleted reservoirs for hydrogen storage should consider the potential for mineral alteration and porosity changes.
📄 Abstract（原文）
Hydrogen geologic storage or underground hydrogen storage (UHS) is an increasingly promising strategy to mitigate the intermittency of renewable energy and decarbonize hard-to-abate industrial sectors. While decades of underground gas storage and CO2 geologic storage provide valuable analogs, the small molecular size, low density, and high diffusivity of H2, combined with its strong reducing capacity, introduce unique challenges for long-term security of the storage site. As an electron donor, H2 can and induce redox reactions with brine and some minerals across typical storage conditions (e.g. temperature, pressure, pH, and salinity), potentially affecting petrophysical properties of the caprocks. To evaluate the feasibility of UHS in depleted hydrocarbon reservoirs, this study investigates H2 reactivity with sulfide minerals commonly seen in fine-grained sedimentary rocks. A caprock sample was selected from the Miocene Monterey Formation at the Elk Hills Oil Field in Southern San Joaquin Basin. The sample was characterized using inductively coupled plasma mass spectrometry (ICP-MS), X-ray diffraction (XRD), and scanning electron microscope (SEM) energy dispersive spectroscopy (EDS). A sub-sample was imaged using synchrotron nano-tomography (nanoCT), then placed in a batch reactor in an anaerobic glove box filled with H2-saturated NaCl solution (diluted synthetic brine), and re-imaged after one week. The nano-CT data reveal dissolution of framboidal pyrite crystals and localized increases in pore volume. Geochemical modeling confirms these observations and highlights reductive dissolution pathways.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.2118/232890-msfirst seen 2026-05-15 20:30:37 · last seen 2026-06-14 04:46:27
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