油气藏评价与开发 ›› 2026, Vol. 16 ›› Issue (1): 23-33.doi: 10.13809/j.cnki.cn32-1825/te.2025192

• 专家论坛 • 上一篇    下一篇

东海西湖凹陷X区块CO2地质封存诱发地震危险性探讨

赵勇(), 冯勤, 孙鑫(), 王庆   

  1. 中国石化上海海洋油气分公司,上海 200127
  • 收稿日期:2025-04-22 发布日期:2026-01-06 出版日期:2026-01-26
  • 通讯作者: 孙鑫(1985—),男,硕士,工程师,从事安全工程工作。地址:上海市浦东新区锦康路50弄2号,邮政编码:200127。E-mail:sunx.shhy@sinopec.com
  • 作者简介:赵勇(1966—),男,博士,教授级高工,从事油气田开发工作。地址:上海市浦东新区锦康路50弄2号,邮政编码:200127。E-mail:yangxs.shhy@sinopec.com
  • 基金资助:
    中国石化科研项目“东海西湖凹陷CO2地质封存技术研究”(P22175)

Investigation on risk of induced earthquakes for CO2 geological storage in X block, Xihu Sag, East China Sea

ZHAO Yong(), FENG Qin, SUN Xin(), WANG Qing   

  1. Sinopec Shanghai Offshore Oil & Gas Company, Shanghai 200127, China
  • Received:2025-04-22 Online:2026-01-06 Published:2026-01-26

摘要:

在“双碳”目标背景下,海域CO2地质封存相较于陆上具有显著优势,是未来CO2捕集、利用与封存(CCUS)技术的重要发展方向。但CO2地质封存等深地工业活动存在诱发地震的风险,而东海陆架盆地作为中国海域CO2地质封存的适宜区域,目前缺乏诱发地震危险性评价研究。基于Dieterich速率状态摩擦定律的诱发地震评价方法,从断层稳定性分析入手,将断层面相对地震活动率与库仑破裂应力变化相关联,结合确定性与概率性评价方法,探讨东海西湖凹陷X区块CO2注入诱发地震的危险性。结果表明:①X区块玉泉组中部目标储层呈背斜形态,12条断层将封存圈闭分割为南北两部分,地应力类型为潜在正断型,所有断层初始状态稳定;②南部圈闭按60×10⁴ t/a的规模开展10 a的CO2封存时,孔隙流体压力扩散对周围断层影响较小,诱发高震级地震风险较低,区块诱发地震震级上限预估为1.8级;③CO2注入速率增大将增加诱发地震风险,分区注入可降低风险,但经济性较差。研究提出的评价方法及成果,可作为CO2地质封存诱发地震危险性的评价手段之一,为CCUS项目安全性提供理论支撑。

关键词: 东海陆架盆地, 西湖凹陷, CO2地质封存, 流体注入诱发地震, 断层稳定性

Abstract:

In the context of the “dual carbon” goals, offshore CO2 geological storage offers significant advantages over onshore storage and represents a key development direction for future carbon capture, utilization and storage (CCUS) technologies. However, deep subsurface industrial activities such as CO2 geological storage carry the risk of inducing earthquakes. Although the East China Sea Shelf Basin is a suitable area for offshore CO2 storage in China, there is currently a lack of studies on the risk of induced earthquakes. An induced earthquake risk assessment method based on the Dieterich’s rate-and-state friction law was employed. Starting from fault stability analysis, the relative seismic activity rate on fault planes was correlated with Coulomb failure stress change. Both deterministic and probabilistic assessment approaches were used to investigate the induced earthquake risk associated with CO2 injection in X block of the Xihu Sag, East China Sea. The results showed that: (1) The target reservoir in the middle Yuquan Formation within X block exhibited an anticline structure. The twelve faults divided the storage trap into northern and southern sections. The in-situ stress regime was potential normal faulting, and all faults were initially stable. (2) When CO2 storage was conducted at a rate of 60×104 t/a over 10 years into the southern trap, the diffusion of pore fluid pressure had a minor impact on surrounding faults, with a relatively low risk of inducing high-magnitude earthquakes. The estimated maximum magnitude of induced earthquakes within the block was 1.8. (3) Increasing the CO2 injection rate would elevate the risk of induced earthquakes. While zonal injection could mitigate this risk, it may not be economically viable due to increased costs. The evaluation methods and findings presented in this study can serve as an assessment approach for induced earthquake risk in CO2 geological storage, providing theoretical support for the safety of CCUS projects.

Key words: East China Sea Shelf Basin, Xihu Sag, CO2 geological storage, fluid injection-induced earthquake, fault stability

中图分类号: 

  • TE58