Citation: | MA Xin, LI Xufeng, WEN Dongguang, LUO Xingwang, DIAO Yujie, YANG Guodong, YIN Shuguo, CAO Wei. A study of the potential of field-scale of CO2 geological storage and enhanced water recovery in the eastern Junggar area of Xinjiang[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 196-205. doi: 10.16030/j.cnki.issn.1000-3665.20201043 |
CO2 geological storage combined with saline recovery (CO2-EWR) is considered to be one of the effective storage methods. Taking the lead in carrying out CO2-EWR technology in the eastern Junggar of Xinjiang can achieve CO2 emission reduction and mean while produce saline water, which can alleviate the local water resources shortage problem to a certain extent, and obtain dual benefits of environment and economy. Previous research mainly focused on generalized models, and the support of engineering practices is lacking. Based on the evaluation results of the suitability of CO2 source - sink matching in the eastern Junggar Basin and the geological data of the first CO2-EWR field pilot test site in China, a 3D heterogeneous model of the Xishanyao Formation of the CO2-EWR test site in the eastern Junggar Basin is constructed to study the potential of the CO2-EWR technology. The results show that the the oretical storage capacity of CO2 at the test site is 1.72 × 106 (P50) tons, and the dynamic storage capacity is 2.14 × 106 tons. When the CO2-EWR technology is adopted, the CO2 dynamic storage capacity can reach 11.18 × 106 tons, which is 5.22 times the CO2 geological storage only, and may increase the production of the saline water resources by 10.17 × 106 tons with a mass ratio of 1 to 0.91 of CO2 sweeping out saline water. Meanwhile, the CO2-EWR technology can effectively slow down the accumulation of reservoir pressure caused by the massive injection of CO2, improve the efficiency of CO2 storage, and increase the saline water production potential. This study can provide theoretical basis and technical support for the implementation of large-scale CO2 geological storage combined with deep saline water production project in the eastern Junggar of Xinjiang.
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Matching of CO2 source and sink in the Junggar Basin
The proposed site model for the CO2-EWR project ineastern Junggar of Xinjiang
Static reservoir models of the study area
Scenario settings
Variation of the cumulative amount of CO2 injection and the average reservoir pressure
Variation of the cumulative amount of CO2 injection in a single well and the overall injection rate
Distribution of CO2(g) saturation
Distribution of dissolved CO2
Cumulative amount of CO2 injection and water production in Case 2
Bottom-hole pressure of injection well in Case 1 and Case 2
Cumulative production amount and production rate of CO2
Volume ratio of produced CO2 to produced saline water(1 bar, 25 ℃)