Development of a Weighting Procedure for the Geomechanical Parameters Involved in CO 2 Storage

Ali Mortazavi () and Dilnaz Zhumakanova
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Ali Mortazavi: School of Mining & Geosciences, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan
Dilnaz Zhumakanova: School of Mining & Geosciences, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan

Energies, 2025, vol. 18, issue 17, 1-22

Abstract: This research focuses on a methodological study of the fault activation mechanisms associated with carbon dioxide (CO 2 ) storage, with a focus on determining the underlying geomechanical properties of the caprock. The study uses an analytic hierarchy process (AHP) to prioritize these parameters in order to improve the process for selecting the critical geomechanical design data that underpin the analysis of potential CO 2 storage sites. By integrating expert knowledge through a structured questionnaire, this study extends the process and provides a weighting methodology to provide realistic parameters as input for advanced numerical simulations. The ratings achieved indicated that the injection pressure was the most significant parameter, while fault cohesion was found to be the least significant parameter, having minimal impact on fault displacement. To validate the weighting methodology, a sensitivity analysis was performed using numerical modeling based on these parameters. The results confirmed the accuracy of the weighting methodology, demonstrating that injection pressure is indeed the most critical factor, while fault cohesion has the least impact on displacement. Additionally, the study advances our understanding of key geomechanical parameters, facilitating the development of customized CO 2 injection and containment strategies aimed at reducing risk and enhancing site integrity.

Keywords: carbon capture and storage (CCS); carbon emission; weighting procedure; geomechanical parameters; analytic hierarchy process (AHP); numerical modeling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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