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<p>Double diffusive convection of dissolved CO<sub>2</sub> due to concentration and temperature differences is important for enhancing dissolution efficiency and storage safety. Understanding the effects of complex geologic environments, including geothermal gradient and geochemical reactions, on CO<sub>2</sub> transport can help predict long-term storage performance. This study elaborates the numerical simulations of double diffusive convection coupled geochemical interactions. Results indicate that higher reaction rates reduce the numbers of finger flows and enhance their spatial alignment with dissolution-induced preferential channels. Results show that accounting for the calcite dissolution enhances the convection flux and storage efficiency, especially low-permeability formations. For highly permeable formations, neglecting the effect of the geothermal gradient on the migration of CO<sub>2</sub> could potentially underestimate the dissolution flux. As the Damköhler number <i>Da</i> increases, ‘hotspots’ of rock dissolution begin to appear near the top boundary early in the onset of convection. Finally, some insights are provided into the reactive double-diffusive convection process at field-scale.</p>

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Reactive double diffusive convection of dissolved CO2 in saline aquifer

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Ruiqi Chen,
  • Wenjie Xu,
  • Chen Zhou,
  • Yunmin Chen,
  • Yayi Zheng,
  • Haoyu Xue,
  • Yingtao Hu

摘要

Double diffusive convection of dissolved CO2 due to concentration and temperature differences is important for enhancing dissolution efficiency and storage safety. Understanding the effects of complex geologic environments, including geothermal gradient and geochemical reactions, on CO2 transport can help predict long-term storage performance. This study elaborates the numerical simulations of double diffusive convection coupled geochemical interactions. Results indicate that higher reaction rates reduce the numbers of finger flows and enhance their spatial alignment with dissolution-induced preferential channels. Results show that accounting for the calcite dissolution enhances the convection flux and storage efficiency, especially low-permeability formations. For highly permeable formations, neglecting the effect of the geothermal gradient on the migration of CO2 could potentially underestimate the dissolution flux. As the Damköhler number Da increases, ‘hotspots’ of rock dissolution begin to appear near the top boundary early in the onset of convection. Finally, some insights are provided into the reactive double-diffusive convection process at field-scale.