Abstract
ABSTRACTGeological storage of CO2 has been viewed as an effective means of reducing CO2 emissions and mitigating the greenhouse effect. In the Taiwan area, the Western Taiwan Basin is suitable for million-ton-scale geological CO2 storage. Numerical methods were used in this study to investigate reservoir performance under various injection pressures. Three formations in the basin, the Chingshui Formation, Kueichulin Formation and Nanchunag Formation, were modeled. Three different injection pressures (1.3, 1.5 and 1.7 times the initial pressure) were considered. The simulation results show that the cumulative injected CO2 mass is proportional to the applied injection pressure and that the storage security increases over time. An annual injection rate of 5 Mt year–1 could be achieved by applying an injection pressure of 1.5 times the initial pressure at the injection well. The pressure accumulation in the system featured three stages. The over-pressurization effects associated with the injection in the system decrease, and the pressure in the system almost returns to the original pressure conditions after 50 years following cessation of injection. The CO2 gas plumes simulated in this study also suggest that the modeled injection scenarios are safe in terms of CO2 leakage from the vertical fault in this area.
Highlights
A large amount of CO2 has been produced by the combustion of substantial quantities of fossil fuels by humans for energy and industrial activities
The simulation results show that the cumulative injected CO2 mass is proportional to the applied injection pressure and that the storage security increases over time
An annual injection rate of 5 million tons of CO2 (Mt) year–1 could be achieved by applying an injection pressure of 1.5 times the initial pressure at the injection well
Summary
A large amount of CO2 has been produced by the combustion of substantial quantities of fossil fuels by humans for energy and industrial activities. Geological CO2 storage (GCS) (Soong et al, 2014), which involves the injection of CO2 into deep formations, is an effective way to reduce CO2 emissions and has been applied for nearly 20 years since the start of the first GCS project. A comprehensive study on largescale geological CO2 storage in the Western Taiwan Basin was conducted to assess the behavior of the reservoir under a hypothesized injection rate of 5 Mt for 50 years. More recent research on CO2 capture technologies and mobility in the saline aquifers, like Yang et al (2014), Jean et al (2016), Wu et al (2016), and Adelodun et al (2016), further improves the confidence in carrying out CO2 capture and storage in Taiwan in the foreseeable future. In this study, the reservoir performance under various injection pressures was examined numerically to complement the previous assessment and provide another reference for a future project aiming to design the injection procedure
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