珠江口盆地恩平凹陷韩江组钙质隔夹层特征和成因及油田开发意义

doi:10.3969/j.issn.1006-6535.2026.04.006

特种油气藏 ›› 2026, Vol. 33 ›› Issue (4): 38-48.DOI: 10.3969/j.issn.1006-6535.2026.04.006

珠江口盆地恩平凹陷韩江组钙质隔夹层特征和成因及油田开发意义

李琦^1,2, 文鑫^1,2, 杨娇^1,2, 宋建虎², 涂乙^1,2, 公证², 杨志鹏²

1.海洋油气高效开发全国重点实验室,北京 102209;
2.中海石油(中国)有限公司深圳分公司,广东深圳 518000

收稿日期:2025-07-28 修回日期:2026-06-05 出版日期:2026-08-25 发布日期:2026-10-15
通讯作者: 文鑫(1988—),男,高级工程师,2010年毕业于西南石油大学资源勘查工程专业,2013年毕业于该校矿产普查与勘探专业,获硕士学位,现从事油气田开发方面工作。
作者简介:李琦(1996—),男,工程师,2018毕业于中国石油大学(华东)资源勘查工程专业,2021年毕业于该校地质资源与地质工程专业,获硕士学位,现从事油气田开发地质方面工作。
基金资助:
“十五五”国家科技重大专项“南海油田高效开发技术与集成示范”(2025ZD1407400)

Characteristics,genesis,and development significance of calcareous baffle interlayers in the Hanjiang Formation,Enping Sag,Pearl River Mouth Basin

Li Qi^1,2, Wen Xin^1,2, Yang Jiao^1,2, Song Jianhu², Tu Yi^1,2, Gong Zheng², Yang Zhipeng²

1. State Key Laboratory of Offshore Oil & Gas Exploitation,Beijing 102209,China;
2. Shenzhen Branch of CNOOC(China)Ltd.,Shenzhen,Guangdong 518000,China

Received:2025-07-28 Revised:2026-06-05 Online:2026-08-25 Published:2026-10-15

摘要/Abstract

摘要： 针对钙质隔夹层发育制约海相砂岩油田精细开发的问题,综合岩心、测井及电阻率探边反演等资料,应用微观识别、岩相分析、机理研究、分布预测等方法,对珠江口盆地恩平凹陷F油田韩江组储层内部钙质隔夹层的发育特征、成因机理、分布规律及油田开发意义开展研究。结果表明:研究区钙质隔夹层主要为钙质细、粉砂岩,钙质成分主要为方解石,常规测井具有低伽马、高密度、低中子、高电阻的特征,电阻率探边表现为红色高阻特征;结合同位素证据识别出生物碎屑溶解再沉淀、蒸发和砂泥岩协同成岩3种成因机制;钙质隔夹层的分布受“层序-沉积-成岩”共同控制,纵向上,稳定泥岩段附近钙质隔夹层连续成层分布,砂岩储层内部钙质隔夹层不连续成层,呈团块状;平面上,顺物源方向钙质隔夹层发育程度较高。该研究成果提升了地质储量估算精度,指导了开发井型设计和优化,为海上少井条件下储层非均质性刻画与剩余油精细挖潜提供了重要依据。

关键词: 钙质隔夹层, 发育特征, 成因机理, 分布规律, 韩江组, 恩平凹陷

Abstract: To solve the problem that the development of calcareous baffle interlayers constrains the fine-scale development of marine sandstone oilfields,core,well logging and resistivity boundary-detection inversion data were integrated.Using microscopic identification,facies analysis,mechanism investigation and distribution prediction,this study investigates the development characteristics,genetic mechanisms,distribution patterns and development significance of calcareous baffle interlayers within the Hanjiang Formation reservoir of the F Oilfield in the Enping Sag,Pearl River Mouth Basin.Results show that calcareous baffle interlayers in the study area are mainly calcareous fine-and silt-sized sandstones,with calcite as the dominant calcareous component.Conventional logs are characterized by low gamma ray,high density,low neutron porosity,and high resistivity;the resistivity boundary-detection response presents a red high-resistivity feature.Combined with isotopic evidence,three genetic mechanisms are identified:dissolution-reprecipitation of bioclasts,evaporation,and sandstone-mudstone coupled diagenesis.The distribution of calcareous baffle interlayers is jointly controlled by "sequence-sedimentation-diagenesis".Vertically,calcareous baffle interlayers are continuously bedded near stable mudstone intervals,whereas those within sandstone reservoirs are discontinuously bedded and occur as massive patches.Laterally,calcareous baffle interlayers are more developed along the provenance direction.These results improve the accuracy of geological reserves estimation,guide the design and optimization of development well types,and provide an important basis for reservoir heterogeneity characterization and fine residual-oil tapping under offshore sparse-well conditions.

Key words: calcareous baffle interlayer, development characteristics, genetic mechanism, distribution pattern, Hanjiang Formation, Enping Sag

中图分类号:

TE122

李琦, 文鑫, 杨娇, 宋建虎, 涂乙, 公证, 杨志鹏. 珠江口盆地恩平凹陷韩江组钙质隔夹层特征和成因及油田开发意义[J]. 特种油气藏, 2026, 33(4): 38-48.

Li Qi, Wen Xin, Yang Jiao, Song Jianhu, Tu Yi, Gong Zheng, Yang Zhipeng. Characteristics,genesis,and development significance of calcareous baffle interlayers in the Hanjiang Formation,Enping Sag,Pearl River Mouth Basin[J]. Special Oil & Gas Reservoirs, 2026, 33(4): 38-48.

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珠江口盆地恩平凹陷韩江组钙质隔夹层特征和成因及油田开发意义

Characteristics,genesis,and development significance of calcareous baffle interlayers in the Hanjiang Formation,Enping Sag,Pearl River Mouth Basin

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