| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
ZHAO Tianpei, YU Chunye, LIU Fangyuan, LI Jiudi, YAN Shumei. Research on efficiency of CO2 geological storage in saline aquifers in clastic rock reservoirs in Xihu Sag, East China Sea[J]. Marine Geology Frontiers, 2025, 41(3): 25-34. doi: 10.16028/j.1009-2722.2025.024
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Research on efficiency of CO2 geological storage in saline aquifers in clastic rock reservoirs in Xihu Sag, East China Sea
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Abstract
Potential for geological carbon dioxide storage in saline aquifers in Chinese maritime territories is substantial. However, considerable disparities in storage efficiency complicated the determination of the effective storage capacity. To enhance the accuracy and regional applicability of effective storage capacity estimation, we reviewed the key factors influencing efficiency coefficients and identified globally applicable methods for the calculation. By integrating seismic, drilling, logging, and core data, we employed statistical techniques for parameter optimization, with which both precision and accuracy of the calculations were improved. Additionally, we proposed a workflow from selecting and calculating efficiency coefficients based on various data sources. The saline water in clastic rocks in the Xihu sag, East China Sea was studied as the case. Results show that saline water in the Yuquan Formation and Longjing Formation are characterized by rich sand bodies with large thickness and multiple sets of reservoir-caprock. Among them, delta plain channel bar deposits are favorable microfacies for CO2 sequestration. Specifically, the storage efficiency of the Yuquan Formation is 6.9%, which is 2.9% higher than that of the Longjing Formation. Based on the storage efficiency, we estimated that the effective storage capacity of the saline aquifers in the Yuquan and Longjing formations in the Xihu Sag is approximately 820 million tons. The Yuquan Formation in the western slope zone exhibits the highest storage potential and could be the optimal place for CO2 sequestration in the Xihu Sag, and can be also considered a good candidate of a pilot area for CO2 sequestration.
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References
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ZHAO Tianpei, YU Chunye, LIU Fangyuan, LI Jiudi, YAN Shumei. Research on efficiency of CO2 geological storage in saline aquifers in clastic rock reservoirs in Xihu Sag, East China Sea[J]. Marine Geology Frontiers, 2025, 41(3): 25-34. doi: 10.16028/j.1009-2722.2025.024
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Figure 1.
Classification criteria and calculation process for evaluating the efficiency of CO2 geological storage
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Figure 2.
Division of structural belts （a） and tectono-stratigraphic evolution （b） of the Xihu Sag
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Figure 3.
Sedimentary facies of the main sequestration target layer
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Figure 4.
Main physical properties of reservoir in Xihu Sag