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<p>The combustion of fossil fuels accounts for over 85% of global energy supply and is a major source of CO₂ emissions. Geological storage in mature reservoirs and deep saline aquifers is a promising mitigation strategy for reducing greenhouse gas emissions. The Paraná Basin (South America) and the Gondwana Damodar and Son-Mahanadi basins (India) present suitable conditions, with porous sandstone reservoirs sealed by impermeable caprocks. This study investigates CO₂–brine–rock interactions in a synthetic saline aquifer under high pressure (25–200&#xa0;bar) and temperature (50–100&#xa0;°C) for 24–96&#xa0;h. The laboratory experiments in a hydrodynamic reactor revealed precipitation of carbonate minerals, confirmed by XRD. PHREEQC modeling predicted the formation of calcite, dolomite, magnesite, siderite, and dawsonite, with a marked decrease in the concentrations of brine ions. The results effectively establish that CO₂–brine interactions promote mineral trapping, providing insights into long-term CO₂ stabilization in saline aquifers.</p>

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Experimental and modeling assessment of geochemical processes in CO₂ storage within saline aquifers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月7日

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  • Marcos Antonio Klunk,
  • Tiago Jonatan Girelli,
  • Kristian Nascimento Telöken,
  • Soyane Juceli Siqueira Xavier,
  • Ayush Srivastava,
  • Sudipta Dasgupta,
  • Farid Chemale Jr,
  • Nattan Roberto Caetano

摘要

The combustion of fossil fuels accounts for over 85% of global energy supply and is a major source of CO₂ emissions. Geological storage in mature reservoirs and deep saline aquifers is a promising mitigation strategy for reducing greenhouse gas emissions. The Paraná Basin (South America) and the Gondwana Damodar and Son-Mahanadi basins (India) present suitable conditions, with porous sandstone reservoirs sealed by impermeable caprocks. This study investigates CO₂–brine–rock interactions in a synthetic saline aquifer under high pressure (25–200 bar) and temperature (50–100 °C) for 24–96 h. The laboratory experiments in a hydrodynamic reactor revealed precipitation of carbonate minerals, confirmed by XRD. PHREEQC modeling predicted the formation of calcite, dolomite, magnesite, siderite, and dawsonite, with a marked decrease in the concentrations of brine ions. The results effectively establish that CO₂–brine interactions promote mineral trapping, providing insights into long-term CO₂ stabilization in saline aquifers.