Project Title: Haimou: Full-chain Safety Monitoring and Risk Assessment Technical System for Sub-seabed Carbon Storage

Participating Enterprises: Shanghai Advanced Research Institute, Chinese Academy of Sciences;Offshore Oil Energy Conservation and Emission Reduction Monitoring Center Co., Ltd.

Award Received:Technological Invention Award - Silver Award

Achievement Level: International Advanced Level

Project Number: ECF-2025-SET-1021

Main Participants: Song Xuexing, Lu Di, Sun Nannan, Wang Yongchang, Shen Guofei, Wang Di, Zhang Long

Expert Review Comments:
International advanced level.This project addresses the strategic requirements of China's dual carbon goals by systematically establishing a comprehensive safety monitoring and risk assessment technology framework for subsea carbon sequestration. It innovatively achieves integrated multidimensional monitoring from seabed to sea surface. Through multi-field coupled numerical simulations, it reveals CO₂ migration patterns and hydrate stability. Optimized algorithms enable precise deployment of monitoring points. Combining multiphase flow simulations with physical information neural networks, it facilitates rapid inversion and intelligent assessment of leakage rates based on bubble morphology. The project develops high-precision online CO₂ monitoring technology for marine environments, significantly enhancing monitoring efficiency and safety assurance capabilities for subsea carbon sequestration. It provides a systematic solution for full-cycle risk prevention and control in CCUS projects, demonstrating outstanding scientific innovation and application value.

Main Innovations:

This project established a comprehensive safety monitoring and risk assessment technology system for the entire subsea carbon sequestration chain, achieving systematic monitoring innovation from seabed to sea surface: - Revealed CO₂ migration patterns and hydrate stability through multi-field coupled numerical simulation; - Optimized subsea monitoring point deployment using algorithms to enhance leak detection efficiency and reduce costs; - Enabled rapid leak volume inversion based on bubble morphology by integrating multiphase flow simulation with physical information neural networks; It has developed high-precision online CO₂ monitoring technology for offshore platforms, providing comprehensive, intelligent safety assurance solutions for CCUS projects.

Main Uses and Technical Principles:

In response to global climate challenges, this project focuses on the safety of subsea carbon sequestration by establishing a comprehensive monitoring and risk assessment technology system. It aims to ensure the long-term, secure storage of carbon dioxide within subsea geological structures, thereby contributing to the achievement of the nation's dual carbon goals. Through multi-field coupled numerical simulations, the project precisely analyzes CO₂ migration patterns. Combined with optimized algorithms for deploying subsea monitoring points, this approach significantly enhances leakage detection efficiency. Utilizing multiphase flow simulation and physical information neural networks, it enables rapid inversion and precise assessment of leakage volumes. Concurrently, it develops high-precision online CO₂ monitoring technology for offshore platforms, establishing comprehensive intelligent oversight from seabed to sea surface. This system delivers a systematic safety solution for global oceanic carbon sequestration, offering dual value in environmental risk prevention and ecological conservation.

Technical Applications:

This project has supported CNOOC Energy Conservation and Emission Reduction Monitoring Center Co., Ltd. in conducting leakage monitoring evaluations. By employing numerical simulation methods to reduce experimental verification, it has significantly lowered analytical costs. According to assessments by the China Geological Survey, the carbon sequestration potential of sedimentary basins in China's maritime areas is estimated at 2.58 trillion tons, which will substantially contribute to carbon reduction efforts in coastal regions. In the future, subsea geological sequestration will see large-scale implementation. As an indispensable safety measure, monitoring of sequestration safety will also be widely adopted, generating economic benefits reaching tens of billions of yuan.