Evaluation of CO2 hydrate storage potential in the Qiongdongnan Basin via combining the phase equilibrium mechanism and the volumetric method
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Abstract
Carbon dioxide capture, utilization and storage technology is considered to be one of the most effective strategies to mitigate CO2 emissions. In this process, CO2 that is injected into seabed sediments under specific temperature and pressure conditions is sealed in the form of CO2 hydrate, known for its high gas storage density and exceptional security features. This method has significant advantages compared with onshore geological storage schemes. Thus far, however, there has been no industrial demonstration of CO2 hydrate storage, and the CO2 hydrate storage potential in the South China Sea remains underexplored without targeted evaluations. In this study, the phase equilibrium mechanism is combined with the volumetric method to describe and evaluate the CO2 hydrate storage distribution range, effective thickness, and potential volume available for CO2 hydrate storage. Based on the latest exploration and development data from the Qiongdongnan Basin, along with geological structure data, multibeam bathymetry, local high-resolution three-dimension multichannel seismic reflection data, logging data, and submarine heat flow data, the distribution of the CO2 hydrate storage stability zone is determined. The results show that the effective thickness and regional scope of CO2 hydrate storage in the concerned area can be determined by virtue of the local water depths and the submarine temperature and pressure of 18 virtual wells. The minimum water depth in the Qiongdongnan Basin that satisfies the temperature and pressure conditions needed for CO2 sediment storage is established as 415 m. The theoretical geological storage capacity of CO2 hydrate in the Qiongdongnan Basin is determined as 5.75×1011 to 8.73×1011 t, where the value range of E is between 0.56 and 0.85. These findings offer a solid foundation for China to create, advance and execute a viable strategy for CO2 hydrate storage.
Document Type: Original article
Cited as: Zhou, X., Wu, S., Bosin, A. Chen, Y., Fang, X., Zhu, L. Evaluation of CO2 hydrate storage potential in the Qiongdongnan Basin via combining the phase equilibrium mechanism and the volumetric method. Advances in Geo-Energy Research, 2024, 11(3): 220-229. https://doi.org/10.46690/ager.2024.03.06
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DOI: https://doi.org/10.46690/ager.2024.03.06
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