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清华大学深圳国际研究生院殷振元团队Energy & Fuels封面论文:CO2注入模式对南海海底沉积物中CO2水合物长期封存影响机制研究

  • 2026-06-11 19:36:29
清华大学深圳国际研究生院殷振元团队Energy & Fuels封面论文:CO2注入模式对南海海底沉积物中CO2水合物长期封存影响机制研究
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论文基本信息

英文期刊:Energy & Fuels(封面论文)第一作者:顾宇航

通讯作者:殷振元

通讯单位:清华大学深圳国际研究生院

论文DOI:https://doi.org/10.1021/acs.energyfuels.6c00409


一、研究背景

水合物法CO₂封存(Hydrate-Based CO₂ Sequestration, HBCS)是极具前景的海洋碳封存技术。 液态CO₂注入海底沉积物后,在适宜温压条件下与孔隙水生成固态CO₂水合物,实现长期稳定封存。相较于枯竭油气藏、深部咸水层封存,HBCS具备封存密度高、自封堵效应强、封存适用区域广等突出优势。

我国南海陆坡发育大面积含水合物沉积盆地,地质条件优越,是开展CO₂水合物封存的理想靶区。

当前研究痛点: 海底沉积物中CO₂注入模式是衔接工程操作与封存安全、封存效率的关键,但长期缺乏系统定量研究;注入位置、注入周期如何影响水合物盖层发育、相态演化与泄漏风险,直接决定工程方案的经济性与安全性。

为此,本研究以南海神狐海域W19站位为地质原型,构建场地尺度热-流-化多场耦合数值模型,定量揭示不同注入模式下CO₂运移、水合物生成及长期封存演化规律,建立封存能力估算方法,为HBCS工程注入策略优化提供科学依据。


二、论文核心亮点

  • 基于自研热-流-化数值模拟器,开展场地尺度水合物法CO₂封存全过程数值模拟;
  • 系统厘清CO₂注入模式对短期液态注入、长期水合物封存行为的调控规律;
  • 解析CO₂水合物、液态CO₂、溶解态CO₂时空演化特征,验证南海海域HBCS长期封存稳定性;
  • 构建新型量化评价指标,定量表征水合物盖层对液态/溶解态CO₂运移的阻隔封堵效应
  • 提出兼顾多相态空间分布的水合物法CO₂封存潜力定量估算方法,支撑区域尺度储量评价。

三、图文导读

图1 模型区位与概念示意

(a) 南海神狐海域W19站位区位; (b) 液态CO₂注入-水合物封存概念示意图; (c) 研究区数值网格剖分。

研究采用自研多场耦合模拟器,依托W19实测地质参数,建立径向500 m、垂向300 m场地尺度模型;神狐海域CO₂水合物稳定区(CHSZ)底界约位于海床以下126 m。

图2 地层关键物性时空演化规律

涵盖不同时刻: (a) 地层压力、(b) 温度、(c) 水合物饱和度、(d) 液态CO₂饱和度、(e) 溶解CO₂质量分数、(f) 地层盐度空间分布。

核心规律:

  1. 注入期超压随水合物生成与流体运移逐步衰减;
  2. 水合物由初期块状分布,逐渐演化形成自封堵盖层;CHSZ底部因高盐度与放热效应出现水合物分解,上部低温区水合物持续生长,最高饱和度达0.62,显著降低储层渗透率;
  3. 液态、溶解态CO₂受盖层阻隔,垂向迁移受限,以径向扩展为主;
  4. 水合物生成排盐效应使局部盐度最高升至6.60%(初始值2.2倍),形成盐度-水合物生成-相态演化热力学负反馈机制。

图3 不同注入位置封存行为对比

(a) 水合物相CO₂质量及占比演化; (b) 溶解态CO₂质量及占比演化; (c) 最大/平均水合物饱和度与分布面积; (d) 液态与溶解态CO₂向上迁移距离。

关键结论:

  1. 注入位置越浅,水合物相封存占比越高:105年上部注入达20.78%,远高于中部8.64%、底部1.52%;
  2. 浅层注入可降低溶解态CO₂占比,减少潜在失稳泄漏风险,提升封存安全性;
  3. 浅层注入水合物饱和度、分布面积更大,封堵抑制效果更强;上部注入105年垂向仅迁移27 m,安全裕度充足;
  4. CO₂向上迁移主要集中在注入期,若无初期泄漏,长期封存期盖层持续生长可进一步规避风险;
  5. 工程优选:水合物稳定区中上部注入,兼顾高转化率与强自封堵。

额外规律:

  • 延长注入时长可提升封存总量,但水合物相转化效率下降;超压增大、潜热与排盐效应抑制局部水合物生长;
  • 总注入量不变时,缩短注入段长度可使局部超压升高约22%,加大CO₂上移泄漏风险;
  • 注入策略需在水合物转化率、地层超压、泄漏风险三者间协同平衡。

图4 区域CO₂封存潜力估算方法

(a) 水合物相+液态相封存质量估算原理; (b) GMGS3区域封存潜力定量结果。

首次建立水合物盖层覆蔽液态CO₂模式下的区域封存潜力估算方法,总封存能力由水合物相+液态相两部分构成,关键参数由数值模拟标定。

以南海GMGS3区域(128 km²)为例: 区域总CO₂封存潜力可达1245.48 Mt,其中水合物相封存201.00 Mt,为HBCS从单井模拟走向区域规模化评价提供工具支撑。


四、研究小结

  1. 依托自研多场耦合模拟器,建立南海神狐海域场地尺度CO₂水合物封存数值模型,揭示注入模式调控封存演化内在机制;
  2. 明确工程优选原则:注入井位布置优先选取水合物稳定区中上部,最大化水合物转化率与自封堵能力;
  3. 厘清注入时长、注入段长度对超压、相态演化及泄漏风险的影响,为工程参数优化提供依据;
  4. 创新构建区域封存潜力估算方法,量化南海靶区封存容量,为南海大规模海洋碳封存工程设计提供理论支撑与技术参考,助力国家双碳战略落地。

作者简介

通讯作者|殷振元

清华大学深圳国际研究生院副教授、特别研究员、博导,天然气水合物与储碳实验室PI;全球前2%顶尖科学家、科技部引进青年人才、广东省珠江计划青年拔尖人才、深圳市高层次人才。

长期从事天然气水合物开采、CO₂捕集与海洋封存、水合储氢等研究;发表SCI论文70余篇,被引5300+,H指数40,含多篇ESI高被引、期刊封面论文;主持国自科、科技部重点研发等课题20余项,授权发明专利20余件,多项成果转化。

第一作者|顾宇航

清华大学2023级环境科学与工程专业博士生,研究方向:水合物法海底碳封存多场耦合数值模拟;已发表SCI论文21篇(一作7篇),授权发明专利6项、软件著作权1项。


论文链接

https://doi.org/10.1021/acs.energyfuels.6c00409

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  1. CONNECT:[ UseTime:0.000467s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000584s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000278s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001598s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000601s ]
  6. SELECT * FROM `set` [ RunTime:0.041707s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000662s ]
  8. SELECT * FROM `article` WHERE `id` = 585022 LIMIT 1 [ RunTime:0.009897s ]
  9. UPDATE `article` SET `lasttime` = 1781816225 WHERE `id` = 585022 [ RunTime:0.008697s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000750s ]
  11. SELECT * FROM `article` WHERE `id` < 585022 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006241s ]
  12. SELECT * FROM `article` WHERE `id` > 585022 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009652s ]
  13. SELECT * FROM `article` WHERE `id` < 585022 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005741s ]
  14. SELECT * FROM `article` WHERE `id` < 585022 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008181s ]
  15. SELECT * FROM `article` WHERE `id` < 585022 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009960s ]
0.179007s