Geochemical Trapping of CO2 in Basaltic Aquifers: Implications from CO2-Water-Rock Interaction Experiments

• TAKAYA Yutaro

  Graduate School of Engineering, University of Tokyo

• NAKAMURA Kentaro

  Japan Agency for Marine-Earth Science and Technology

• KATO Yasuhiro

  Graduate School of Engineering, University of Tokyo

Bibliographic Information

Other Title

• 玄武岩質帯水層内でのＣＯ２地化学トラッピング：ＣＯ２‐水‐玄武岩反応実験からの示唆
• 玄武岩質帯水層内でのCO2地化学トラッピング--CO2-水-玄武岩反応実験からの示唆
• ゲンブガンシツ タイスイソウ ナイ デ ノ CO2チ カガク トラッピング CO2 ミズ ゲンブガン ハンノウ ジッケン カラ ノ シサ

Abstract

Quite recently, a basaltic aquifer receives particular attention as a suitable candidate for CO₂ aquifer storage because basaltic rocks contain high concentrations of Ca, Mg, and Fe that can enhance CO₂ geochemical trapping via acid neutralization and carbonate mineral formation. Despite the increasing interest in basaltic aquifer CO₂ storage, there are few experimental researches on CO₂-water-basalt interaction. In addition, the influence of rock alteration on the geochemical trapping processes has not been considered. In this study, therefore, we conducted CO₂-water-basalt interaction experiments using three types of fresh to altered basaltic rocks.<BR>The fresh basalt (non-altered basalt) is composed of olivine, plagioclase, and basaltic glass. On the other hand, the basic schist (high-T altered basalt) completely consists of secondary greenschist minerals (albite, epidote, chlorite, actinolite, quartz) , and the seamount basalt (low-T altered basalt) is mainly composed of secondary clay minerals (celadonite, smectite, Fe-oxyhydroxide) . In our experiments, the cations eluted from fresh basalt and basic schist are mostly Mg and Na, while the fluids reacting with seamount basalt contain large amount of Na and K with noticeably higher pH. This suggests that Na and K eluted from clay minerals play an important role in acid neutralization. Our experiments further demonstrate that, regardless of alteration types, a Na-dominant condition emerges at an early stage of the CO₂ storage in a basaltic aquifer, leading to dawsonite (NaAlCO₃ (OH) ₂) precipitation. The present findings lead us to propose a new perspective on carbonate formation sequence of dawsonite → siderite → calcite/dolomite in basaltic aquifers.

Journal

• Journal of MMIJ

  Journal of MMIJ 126 (4/5), 131-137, 2010

  The Mining and Materials Processing Institute of Japan

Keywords

• CCS
• CO<SUB>2</SUB> Aquifer Storage
• Water-Rock Interaction
• Basaltic Aquifer

Details

• CRID: 1390001205276141952
• NII Article ID: 10026215690
• NII Book ID: AA12188381
• DOI: 10.2473/journalofmmij.126.131
• ISSN: 18840450
• ISSN: 18816118
• NDL BIB ID: 10632652
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10632652
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed