海上咸水层CO<sub>2</sub>封存断层侧向封闭性评价——以珠江口盆地恩平凹陷恩平A油田为例

柴愈坤; 任旭; 戴建文; 谢明英; 王华; 汪生好; 冯沙沙; 秦朝中; 汪涛; 甘泉

doi:10.11781/sysydz2025051185

海上咸水层CO₂封存断层侧向封闭性评价——以珠江口盆地恩平凹陷恩平A油田为例

doi: 10.11781/sysydz2025051185

柴愈坤¹,
任旭²,
戴建文^1,3,
谢明英^1,3,
王华^1,3,
汪生好¹,
冯沙沙^1,3,
秦朝中²,
汪涛²,
甘泉²

1. 中海石油(中国)有限公司深圳分公司, 深圳 518000;
2. 重庆大学资源与安全学院, 重庆 400030;
3. 海洋油气高效开发全国重点实验室, 北京 102209

基金项目:

中国海油三新三化项目“恩平油田CO₂捕集和封存技术研究与示范应用”(YXKY-SXSH-2021-SZ-01)资助。

详细信息

作者简介:
柴愈坤(1986—)，女，高级工程师，从事油气开发地质研究及储量评价。E-mail：chaiyk@cnooc.com.cn。

中图分类号: P618.19
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出版历程
- 收稿日期: 2025-03-16
- 修回日期: 2025-08-05
- 刊出日期: 2025-09-28

Evaluation of fault lateral sealing for CO₂ storage in offshore saline aquifers: a case study of Enping A Oilfield in Enping Sag, Pearl River Mouth Basin

1. Shenzhen Branch of China National Offshore Oil Corporation, Shenzhen, Guangdong 518000, China;
2. School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China;
3. National Key Laboratory for Efficient Development of Marine Oil and Gas, Beijing 102209, China

摘要

摘要: 碳捕集、利用与封存(CCUS)技术作为应对全球气候变化的关键手段，在实现“双碳”目标中具有重要战略地位。其中，CO₂在咸水层中封存是碳封存的主要方式，而断层圈闭封闭性是CO₂地质封存的重要场地筛选标准，其侧向封闭性的准确评价是决定CO₂封存安全性的关键问题。目前，断层侧向封闭性评价方法主要针对常规油气藏进行定性和定量评价，而针对咸水层CO₂封存的系统性评价方法和体系仍较匮乏。针对海上咸水层CO₂封存安全性评价的关键难题，以珠江口盆地珠三坳陷恩平凹陷恩平A油田为例，开展关键断层内部矿物分布与胶结性的非均质性研究。基于断层泥比率(SGR)、过断层压力差(AFPD)及封闭气柱高度，建立了一套CO₂断层侧向封闭性评价方法，评价断层对CO₂的封闭性能，确定CO₂封存目标层位。研究结果表明，F1、F3断层在粤海320和韩江420层位具有静态封闭能力，CO₂最大羽流柱高度分别为50～400 m、175～300 m。两套地层对CO₂具有良好的密闭性和储存性，可作为恩平A油田CO₂封存目标层位。通过该研究结果建立断层空间封闭性评价技术，根据不同层位断距—距离曲线及单井泥质含量信息，得到相应层位断面属性及断层封闭性三角图，实现断层区域封闭性定量评价，为未来CO₂咸水层封存提供了定量化筛选评价依据。
- CO₂封存 /
- 断层侧向封闭性 /
- 断层泥比率 /
- 跨断层压力 /
- 恩平凹陷 /
- 珠江口盆地
Abstract: Carbon capture, utilization, and storage (CCUS) has been considered a key strategy in addressing global climate change and holds strategic importance in achieving the “dual carbon” goals. Among various approaches, CO₂ storage in saline aquifers has been identified as the primary method of carbon sequestration. The sealing capacity of a fault seal is regarded as a crucial criterion for site selection in CO₂ geological storage, and the accurate evaluation of fault lateral sealing is considered critical for ensuring storage security. At present, most evaluation methods for lateral sealing focus on qualitative and quantitative assessments of conventional hydrocarbon reservoirs, while systematic methods and frameworks for CO₂ storage in saline aquifers remain limited. To address the key challenge of evaluating CO₂ storage security in offshore saline aquifers, the Enping A Oilfield in the Enping Sag of the Zhu Ⅲ Depression, Pearl River Mouth Basin, was selected as a case study. The heterogeneity of mineral distribution and cementation within key faults was investigated. Based on parameters including Shale Gouge Ratio (SGR), Across-Fault Pressure Difference (AFPD), and sealed gas column height, a method was developed for evaluating fault lateral sealing capacity for CO₂ storage, enabling assessments of sealing performance and identification of target layers for CO₂ storage. The results showed that the F1 and F3 faults possess static sealing capacity at the Yuehai 320 and Hanjiang 420 layers. The maximum CO₂ plume column heights are estimated to be 50 to 400 m and 175 to 300 m, respectively. Both formations exhibit favorable sealing and storage properties for CO₂ and can be consi-dered as target layers for CO₂ storage in the Enping A Oilfield. Based on the findings, a spatial sealing evaluation technique for faults was developed. By integrating fault throw-distance curves and single-well clay content data for different layers, fault surface attributes and fault sealing ternary diagrams were generated, enabling quantitative evaluation of fault zone sealing. The study provides a basis for the quantitative screening and assessment of saline aquifers for future CO₂ storage.
- CO₂ storage /
- fault lateral sealing /
- shale gouge ratio /
- across-fault pressure difference /
- Enping Sag /
- Pearl River Mouth Basin

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