09:45 〜 10:00
[HSC06-04] Investigation of geochemical responses to CO2 injection in Carbonate and Sandstone Saline Aquifers
キーワード：Carbon Capture and Storage, TOUGHREACT, Sandstone, Carbonate, Halite
The global energy sector is undergoing a significant shift towards sustainability, driven by the urgent need to mitigate climate change and reduce reliance on fossil fuels, along with the high energy costs they incur. In this context, Carbon Capture and Storage (CCS) has witnessed an increase in attention as an effective strategy to alleviate the climate change and emissions of carbon based gases. In practicality, with having enormous literature on CCS, still we need to address various challenges. Therefore, comprehensive studies are needed to understand the possible interaction between CO2 , brine and rocks.
This study investigate the practicability of CO2 storage in Carbonate and Sandstone saline aquifers and it Consequently, CO2 core flooding experiments were conducted on sandstone and carbonate rock samples. The objective of this study is to measure changes in pH, permeability, mineral composition, and salt precipitation due to injection of CO2. Additionally, as the experiments show the precipitation of salt in core samples, various conditions of CO2 injection are evaluated using simulation software to learn under what conditions halite might precipitate.
The experimental results show the immediate permeability of sandstone after injection of CO2 was reduced approximately 82.9%. However, its permeability was increased around 1.2% relative to its initial condition 24 hours after injection. In carbonate rock sample, the permeability of rock was reduced around 51%. SEM scanning of the core samples show precipitation and formation of the salt crystals within cores. The same results are validated in TOUGHREACT, a simulation modeling software. Since the core flooding experiments are conducted in a periods of 1 to 2 days, CO2 injection for a long period is analyzed in TOUGHREACT using a 2D radial model representing the subsurface formation. The model examined pH, permeability, mineral composition over a projected period of 100 years after injection. The changes in parameters are detected near to the injection site and impact is reduced as the further distance is inspected. In simulation the halite precipitation did not occur. Therefore, following the main aim, different situations are simulated to understand what conditions yield in precipitation of halite. This research provides valuable data helping development effective CCS strategies for saline aquifers regarding the injectivity and storage challenges.
This study investigate the practicability of CO2 storage in Carbonate and Sandstone saline aquifers and it Consequently, CO2 core flooding experiments were conducted on sandstone and carbonate rock samples. The objective of this study is to measure changes in pH, permeability, mineral composition, and salt precipitation due to injection of CO2. Additionally, as the experiments show the precipitation of salt in core samples, various conditions of CO2 injection are evaluated using simulation software to learn under what conditions halite might precipitate.
The experimental results show the immediate permeability of sandstone after injection of CO2 was reduced approximately 82.9%. However, its permeability was increased around 1.2% relative to its initial condition 24 hours after injection. In carbonate rock sample, the permeability of rock was reduced around 51%. SEM scanning of the core samples show precipitation and formation of the salt crystals within cores. The same results are validated in TOUGHREACT, a simulation modeling software. Since the core flooding experiments are conducted in a periods of 1 to 2 days, CO2 injection for a long period is analyzed in TOUGHREACT using a 2D radial model representing the subsurface formation. The model examined pH, permeability, mineral composition over a projected period of 100 years after injection. The changes in parameters are detected near to the injection site and impact is reduced as the further distance is inspected. In simulation the halite precipitation did not occur. Therefore, following the main aim, different situations are simulated to understand what conditions yield in precipitation of halite. This research provides valuable data helping development effective CCS strategies for saline aquifers regarding the injectivity and storage challenges.