DEVELOPMENT OF A WEIGHTING PROCEDURE FOR GEOMECHANICAL PARAMETERS INVOLVED IN CO2 STORAGE
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Date
2024-04-19
Authors
Zhumakanova, Dilnaz
Journal Title
Journal ISSN
Volume Title
Publisher
Nazarbayev University School of Mining and Geosciences
Abstract
This study focuses on methodical study of fault activation mechanisms associated with carbon dioxide (CO2) storage, with a focus on determining the underlying geomechanical properties of the caprock. The study uses the Analytic Hierarchy Process (AHP) to prioritize these parameters to improve the process for selecting critical geomechanical design data that underpins the analysis of potential CO2 storage sites. By integrating expert knowledge through a structured questionnaire, the study extends the methodology and provides realistic parameters for advanced numerical simulations. The study highlights the importance of injection pressure as the primary factor, emphasizing its dominant influence, followed by permeability and porosity, which are fundamental to estimating reservoir capacity and fluid dynamics within the reservoir. Conversely, the fault friction angle, although considered the least influential, requires attention due to its conditional influence on fault stability. The new application of AHP in this context represents a significant advance in the field of CO2 storage, offering a systematic approach to geomechanical risk assessment that is essential for storage planning and operational safety. Additionally, the study advances our understanding of key geomechanical parameters, facilitating the development of customized CO2 injection and containment strategies aimed at reducing risk and enhancing site integrity. Such strategic foresight is essential to the progress of carbon capture and storage (CCS) technologies, a critical component of climate change mitigation efforts. In support of these findings, numerical simulations show a direct correlation between injection pressure and total displacement, as well as an inverse relationship with stress ratio, highlighting the importance of optimized injection strategies. The performance of RS2 software in 2D numerical simulations is also confirmed, demonstrating its usefulness in CO2 storage projects, and allowing the influence of additional parameters such as fault friction angle and rock mass fracturing to be explored.
Description
Keywords
CO2 storage, Carbon Capture and Storage, Weighting procedure, Geomechanical parameters, Type of access: Restricted
Citation
Zhumakanova, D. (2024). Development of a weighting procedure for geomechanical parameters involved in CO2 storage. Nazarbayev University School of Mining and Geosciences