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Advancing CO 2 Solubility Prediction in Brine Solutions with Explainable Artificial Intelligence for Sustainable Subsurface Storage

Author

Listed:
  • Amin Shokrollahi

    (School of Chemical Engineering, Discipline of Mining and Petroleum Engineering, The University of Adelaide, Adelaide, SA 5005, Australia)

  • Afshin Tatar

    (School of Chemical Engineering, Discipline of Mining and Petroleum Engineering, The University of Adelaide, Adelaide, SA 5005, Australia)

  • Abbas Zeinijahromi

    (School of Chemical Engineering, Discipline of Mining and Petroleum Engineering, The University of Adelaide, Adelaide, SA 5005, Australia)

Abstract

Underground CO 2 storage is crucial for sustainability as it reduces greenhouse gas (GHG) emissions, helping mitigate climate change and protect the environment. This research explores the use of Explainable Artificial Intelligence (XAI) to enhance the predictive modelling of CO 2 solubility in brine solutions. Employing Random Forest (RF) models, the study integrates Shapley Additive exPlanations (SHAP) analysis to uncover the complex relationships between key variables, including pressure ( P ), temperature ( T ), salinity, and ionic composition. Our findings indicate that while P and T are primary factors, the contributions of salinity and specific ions, notably chloride ions (Cl − ), are essential for accurate predictions. The RF model exhibited high accuracy, precision, and stability, effectively predicting CO 2 solubility even for brines not included during the model training as evidenced by R 2 values greater than 0.96 for the validation and testing samples. Additionally, the stability assessment showed that the Root Mean Squared Error ( RMSE ) spans between 8.4 and 9.0 for 100 different randomness, which shows good stability. SHAP analysis provided valuable insights into feature contributions and interactions, revealing complex dependencies, particularly between P and ionic strength. These insights offer practical guidelines for optimising CO 2 storage and mitigating associated risks. By improving the accuracy and transparency of CO 2 solubility predictions, this research supports more effective and sustainable CO 2 storage strategies, contributing to the overall goal of reducing greenhouse gas emissions and combating climate change.

Suggested Citation

  • Amin Shokrollahi & Afshin Tatar & Abbas Zeinijahromi, 2024. "Advancing CO 2 Solubility Prediction in Brine Solutions with Explainable Artificial Intelligence for Sustainable Subsurface Storage," Sustainability, MDPI, vol. 16(17), pages 1-26, August.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:17:p:7273-:d:1462956
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    References listed on IDEAS

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