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This study examines the impact of varying CO2 stream qualities, particularly those containing nitrogen (N2), on CO2 injection strategies and storage site behavior using the MATLAB Reservoir Simulation Toolbox (MRST) compositional model. The research simulates the injection of impure CO2 into a reservoir, representative of those in the North Sea, with a focus on plume migration and its associated reservoir flow processes. The study is structured in phases: in the first, relevant geophysical and geological parameters of the storage site are defined, and the most suitable Equation of State (EOS) is selected for accurate fluid behavior modelling. In the second phase, a sensitivity analysis is conducted, varying porosity and permeability to assess their impact on reservoir performance. The final phase evaluates how CO2 compositions, including N2, affect reservoir characteristics such as pressure, gas saturation, and fluid composition. Preliminary results indicate how the presence of N2 in CO2 streams influences plume migration and storage site stability. These findings will guide the optimization of CO2 injection strategies for long-term storage efficacy and safety.

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Compositional Modeling of Impure CO2 Injection into Depleted Gas Fields for Geological Storage

  • 章节

  • 发表日期：

    2025年

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  • Richard T. J. Porter,
  • Haroun Mahgerefteh,
  • Sergey Martynov

摘要

This study examines the impact of varying CO2 stream qualities, particularly those containing nitrogen (N2), on CO2 injection strategies and storage site behavior using the MATLAB Reservoir Simulation Toolbox (MRST) compositional model. The research simulates the injection of impure CO2 into a reservoir, representative of those in the North Sea, with a focus on plume migration and its associated reservoir flow processes. The study is structured in phases: in the first, relevant geophysical and geological parameters of the storage site are defined, and the most suitable Equation of State (EOS) is selected for accurate fluid behavior modelling. In the second phase, a sensitivity analysis is conducted, varying porosity and permeability to assess their impact on reservoir performance. The final phase evaluates how CO2 compositions, including N2, affect reservoir characteristics such as pressure, gas saturation, and fluid composition. Preliminary results indicate how the presence of N2 in CO2 streams influences plume migration and storage site stability. These findings will guide the optimization of CO2 injection strategies for long-term storage efficacy and safety.