Speaker
Description
We have developed a multi-continuum model for CO2 flow, transport and storing in fractured vuggy karst formations. The objective of this study is to develop a modeling tool for evaluating the potential and effectiveness of karst aquifers as alternative CO2 storing formations. A multi-continuum model, representing rock matrix, fracture, and vuggy continua, is applied to capture the complexity in pore distributions and flow pathways of karst aquifers. The multi-continuum model is able to describe explicitly effects of vugs over the traditional double-porosity model, which ignores the existence of vugs in karst formations. Modeling studies are conducted under various simulation scenarios, including uniformly and randomly distributed vugs, to assess the influence of vugs, if existing, on storage capacity, CO2 distribution, and injection strategy, providing critical insights for advancing geosequestration technologies in karst aquifers as alternative formations.
The study reveals that vug porosity, whether uniformly or randomly distributed, plays a critical role in enhancing CO2 storage capacity within karst aquifers, particularly in water-wet formations where vugs offer large storage potential. The multi-continuum model proves superior to the double-porosity model in describing the intricate flow and storage dynamics in these fractured formations. Simulations showed that smaller vug porosity expands the Area of Review (AoR), indicating a broader distribution or larger plume of CO2. Randomly distributed vugs create irregular AoR edges, leading to complex flow patterns, which can complicate monitoring and management efforts. These irregularities are further amplified by variations in fracture permeability. Pressure profiles indicated a significant increase during the initial CO2 injection phase, underscoring the need for careful management of injection rates to maintain reservoir integrity. These findings highlight the importance of considering vug porosity and utilizing advanced modeling techniques, such as the multi-continuum model, to optimize CO2 storage operation and efficiency and manage risks in karst CO2 storing environments, supporting the transition to sustainable energy practices.
| Country | USA |
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