苏北盆地高邮凹陷花页1井古近系阜宁组裂缝脉体流体演化及其对页岩油充注过程的指示意义

李超; 罗涛; 黄亚浩; 刘义承; 陈俊林; 王川

doi:10.11781/sysydz202402228

苏北盆地高邮凹陷花页1井古近系阜宁组裂缝脉体流体演化及其对页岩油充注过程的指示意义

doi: 10.11781/sysydz202402228

李超^1,,
罗涛²,
黄亚浩^2, ,,
刘义承²,
陈俊林³,
王川³

1.
中国石化华东石油工程有限公司, 南京 211400
2.
长江大学资源与环境学院, 武汉 430100
3.
中国地质大学(武汉) 资源学院, 武汉 430074

基金项目:

国家自然科学联合基金“盆地深部地质作用过程与资源效应” U20B6001

详细信息

作者简介:
李超(1971—)，男，高级工程师，从事油气勘探开发及石油工程技术管理研究。E-mail：lic.oshd@sinopec.com

通讯作者:
黄亚浩(1990—)，男，副教授，从事深层及非常规油气富集机理研究。E-mail：hyhtr08916@163.com

中图分类号: TE122.1
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- 被引次数: 0
出版历程
- 收稿日期: 2023-06-24
- 修回日期: 2024-01-03
- 刊出日期: 2024-03-28

Fluid evolution of fracture veins of Paleogene Funing Formation in well HY1 in Subei Basin and implications for shale oil filling

1.
SINOPEC East China Petroleum Engineering Co., Ltd., Nanjing, Jiangsu 211400, China
2.
College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China
3.
School of Earth Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China

摘要

摘要: 苏北盆地页岩油勘探开发取得重大突破。高邮凹陷花页1井岩心观察发现，古近系阜宁组二段富有机质页岩中天然裂缝发育，脉体内保存了大量页岩油气流体活动迁移的信息。以阜二段页岩裂缝充填的方解石脉体为研究对象，综合运用矿物学、元素地球化学、地质年代学以及地质流体技术，聚焦页岩裂缝脉体的古流体来源、脉体形成时间以及流体包裹体特征开展深入研究，提出页岩含油层埋藏、抬升剥蚀过程中古温度条件与对应地质时间。阜二段页岩裂缝主要产状类型为层理缝、滑脱缝、剪切缝、收缩缝和张性缝，裂缝内主要充填一期纤维状方解石脉体，方解石脉体表现为偏还原环境热液流体的来源；始新世中期阜二段裂缝脉体捕获原生绿色荧光油包裹体、始新世晚期捕获次生蓝色荧光油包裹体和第四纪晚期捕获次生绿色荧光油包裹体，分别指示了富有机质页岩主要存在三期页岩油的充注过程。页岩油的充注主要在页岩最大埋深时期形成，三垛构造运动对于该地区页岩油的调整运移具有重要作用。
- 页岩裂缝脉体 /
- 流体包裹体 /
- 流体活动 /
- 页岩油 /
- 阜宁组 /
- 古近系 /
- 苏北盆地
Abstract: A significant breakthrough has been made in the exploration and development of shale oil in the Subei Basin. Cores from well HY1 in the Gaoyou Sag of Subei Basin indicate the presence of well-developed natural fractures within the organic-rich shale of the second member of Paleogene Funing Formation. These fractures contain compelling evidence of shale oil, gas, and fluid activities and migration. This study specifically examines the calcite veins filling the shale fractures within the second member of Funing Formation. Through the integration of methodologies from mineralogy, elemental geochemistry, geochronology, and geological fluid analysis, the originof paleo fluids, the timing of vein formation, and fluid inclusions within the shale fracture veins are investigated. This study also sheds light on paleotemperature conditions and corresponding geological timeframes during the burial, uplift, and denudation of the shale oil-bearing layers. The primary fracture types observed in the second member of Funing Formation include bedding fractures, detachment fractures, shear fractures, shrinkage fractures, and tensile fractures, predominantly filled with fibrous calcite veins indicating a source linked to hydrothermal fluids in a reducing environment. Notably, three distinct stages of shale oil injection are evident within the organic-rich shale fracture veins of the second member of Funing Formation, marked by primary green fluorescent oil inclusions from the Middle Eocene, secondary blue fluorescent oil inclusions from the Late Eocene, and secondary green fluorescent oil inclusions from the Late Quaternary period. The primary accumulation of shale oil occurred during the period of maximum burial depth, emphasizing the significant role of tectonic movements, especially the Sanduo tectonic event, in the redistribution and migration of shale oil in the region.
- shale fracture vein /
- fluid inclusion /
- fluid activity /
- shale oil /
- Funing Formation /
- Paleogene /
- Subei Basin
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors disclose no relevant conflict of interests.

作者贡献/Authors’Contributions

李超负责论文编写与修改；黄亚浩负责实验设计；罗涛负责脉体来源示踪和流体包裹体分析；刘义承负责页岩油富集时间与保存条件分析；陈俊林负责图件绘制；王川负责稿件校对。所有作者均阅读并同意最终稿件的提交。

LI Chao was responsible for the preparation and revision of the paper. HUANG Yahao was responsible for experimental design. LUO Tao was responsible for the tracing of vein source and the analysis of fluid inclusions. LIU Yicheng was responsible for the analysis of shale oil enrichment time and preservation conditions. CHEN Junlin was responsible for picture drawing. WANG Chuan was responsible for manuscript proofreading. All the authors have read the last version of paper and consented for submission.

HTML全文

图 1 苏北盆地高邮凹陷构造单元和地层分布

Figure 1. Structural unit and stratigraphic distribution of Gaoyou Sag in Subei Basin

下载: 全尺寸图片幻灯片

图 2 苏北盆地高邮凹陷花页1井阜二段富有机质页岩裂缝脉体岩相学照片

a.层理缝脉体岩心；b.滑脱缝脉体岩心；c.张性缝脉体岩心；d.剪切缝脉体岩心。

Figure 2. Petrographic photos of fracture veins of organic-rich shale in second member of Funing Formation in well HY1, Gaoyou Sag, Subei Basin

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图 3 苏北盆地高邮凹陷花页1井阜二段页岩裂缝脉体阴极发光照片

a，c.富有机质页岩纤维状方解石透射光照片；b，d.富有机质页岩纤维状方解石阴极发光照片。

Figure 3. Cathodoluminescence photos of shale fracture veins in second member of Funing Formation in well HY1, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 4 苏北盆地高邮凹陷花页1井阜二段页岩裂缝脉体稀土元素配分模式

Figure 4. Rare earth element distribution pattern of shale fracture veins in second member of Funing Formation in well HY1, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 5 苏北盆地高邮凹陷花页1井阜二段页岩裂缝脉体中流体包裹体岩相学照片

a.次生蓝白色油包裹体；b.次生绿色油包裹体；c.原生绿色油包裹体；d.次生蓝白色油包裹体；e.原生绿色油包裹体；f次生蓝白色油包裹体。

Figure 5. Petrographic photos of fluid inclusions in shale fracture veins in second member of Funing Formation in well HY1, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 6 苏北盆地高邮凹陷花页1井阜二段页岩裂缝脉体中流体包裹体荧光光谱

Figure 6. Fluorescence spectra of fluid inclusions in shale fracture veins in second member of Funing Formation in well HY1, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 7 苏北盆地高邮凹陷花页1井阜二段裂缝脉体内流体包裹体均一温度分布

Figure 7. Homogeneous temperature distribution histogram of fluid inclusions in fracture veins in second member of Funing Formation in well HY1, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 8 苏北盆地高邮凹陷花页1井层理缝方解石脉体U-Pb同位素定年等时线

Figure 8. U-Pb isotope dating isochrones of calcite veins in bedding fractures in well HY1, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 9 苏北盆地高邮凹陷花页1井埋藏—热演化史及油气成藏期次

Figure 9. Burial-thermal evolution history and hydrocarbon accumulation period of well HY1 in Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

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