Carbon Capture, Utilization, and Storage (CCUS) technology has emerged as the bottom-line technology for achieving carbon neutrality goals in China. The development of Carbon Dioxide Enhanced Oil Recovery (CO2-EOR) not only increases revenue for high-investment CCUS projects but also enables permanent CO2 storage in the oil reservoir. However, the basin is used as the research object to evaluate the CO2 storage potential of the oil reservoir. The evaluation results are inaccurate and unable to support the implementation of later CCUS projects. Here, more accurate oil reservoir data is employed as the evaluation object. It is the first time at the national level to screen oil reservoirs to distinguish between CO2 miscible and immiscible, and evaluate the potential of CO2-EOR and CO2 storage in the reservoir. The research results show a total of 2570 suitable oil reservoirs in 4386 candidate oil reservoirs nationwide. About 1.26 billion tons of additional crude oil can be produced by CO2-EOR technology. This includes approximately 580 million tons of additional oil from CO2 miscible flooding and 680 million tons from CO2 immiscible flooding. The study further refines the CO2 geological utilization data and provides a theoretical basis for CCUS project site selection in China.
The assessment of the suitability of CO2 storage sites is the basis for large-scale deployment of Carbon Capture Utilization and Storage (CCUS) projects. However, the research on the suitability of CO2 in sedimentary basins is relatively lagging behind in China. Previous studies have focused on CO2 storage sites, while social, economic and environmental factors are ignored. This paper takes counties and districts as the research objects, and conducts a comprehensive evaluation of onshore sedimentary basins. The research results show that: (1) Onshore sedimentary basins cover 839 counties (districts) in China, of which 318 counties (districts) are prohibited from implementing CO2 storage; 286 counties (districts) are Class II environmental risk areas; The suitable and suitable areas include 217 and 19 counties (districts) respectively, accounting for about 45% of the total onshore storage area. (2) The suitable and relatively suitable areas are mainly distributed in the Tarim Basin, the central and northern parts of the Songliao Basin, the northwestern part of the Ordos Basin, the northeastern part of the Erlian Basin, and the central and southern parts of the Bohai Bay Basin. Forbidden areas and general suitable areas are mainly distributed in Sichuan Basin, Jianghan-Dongting Basin, North Jiangsu Basin, northeastern Bohai Bay Basin, and southern Songliao Basin. This study establishes a method for assessing the suitability of CO2 storage sites, and gives a suitable area for CO2 storage in China, which provides a method and basis for the site selection of large-scale deployment of CCUS projects in China.
Climate change is a huge challenge facing the world. Carbon Capture, Utilization and Storage (CCUS) is an important technology that is expected to ensure the continued safe and large-scale use of fossil energy under the pressure of climate change in China. However, the current CCUS project has a large initial investment, and it is difficult to realize the commercialization of CCUS technology. The development of CCUS cluster centers can effectively reduce the overall investment of CCUS projects, which is the development trend of CCUS projects. This study identified 20 coal-fired power plant cluster centers and 6 oil and gas field gathering and transportation centers by utilizing Chinese coal-fired power plant data and oil and gas field data. Finally, the CO2 pipe network between the cluster centers is planned. This study provides data and research methods for identifying potential CCUS clusters and storage and transportation centers in China. It can provide a theoretical reference for further research on the matching site selection of CO2 transport pipelines and CO2 sources and sinks in China.
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