| 苏北盆地高邮凹陷阜二段页岩稀土元素特征及地质意义 |
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| 引用本文：宋言,段宏亮,孙雅雄,王永辉,薛锴,唐远涛,高先志.2025.苏北盆地高邮凹陷阜二段页岩稀土元素特征及地质意义[J].地球学报,46(6):1188-1198. |
| DOI：10.3975/cagsb.2025.011601 |
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| 基金项目:中国石化科技开发部项目“内陆断陷湖盆断块型页岩油勘探开发关键技术”(编号: P23189)；“东部断陷盆地页岩储层差异演化机制及建模”(编号: P24207); 中国石化江苏油田分公司科研课题(编号: JS24038); 江苏省卓越博士后计划(编号: 2022ZB897) |
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| 中文摘要:阜二段为苏北盆地的主力烃源岩发育层系和勘探重点, 近年来, 随着高邮凹陷HY1等页岩油水平井的成功试采, 展现出了巨大的页岩油勘探潜力。然而, 目前对阜二段页岩的沉积速率、后期是否受到成岩作用影响以及物源区的构造背景、母岩属性和物源方向研究比较薄弱, 严重制约了阜二段页岩油的进一步勘探。本文以苏北盆地高邮凹陷重点井阜二段页岩为研究对象, 开展稀土元素地球化学特征研究, 并讨论其对阜二段页岩成岩作用、沉积环境和物源区特征的指示意义。结果表明, 苏北盆地高邮凹陷阜二段轻稀土元素含量富集, 重稀土元素含量亏损, 配分曲线表明为明显的右倾, Eu负异常明显, Ce正异常微弱。表明: 苏北盆地高邮凹陷阜二段沉积环境属于相对稳定的缺氧还原环境, 氧化还原条件纵向上没有明显变化, 沉积速率自下而上逐渐减小。苏北盆地高邮凹陷阜二段构造背景为与大陆岛弧有关的活动大陆边缘; 母岩属性为大陆上地壳长英质/基性物质形成的沉积岩和花岗岩混合; 高邮凹陷阜二段物源主要来自于苏北盆地北西侧苏鲁造山带、西侧大别山造山带和南西侧张八岭隆起三个物源供给区。 |
| 中文关键词:苏北盆地 高邮凹陷 阜二段 稀土元素 沉积环境 物源 |
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| Characteristics and Geological Significance of Rare Earth Elements of the Second Member of Funing Formation in Gaoyou Sag, Subei Basin |
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| Abstract:The second member of the Funing Formation is the main source rock group and the focus of exploration in the Subei Basin. In recent years, the successful production of shale oil horizontal wells, such as HY1 in Gaoyou Sag, has shown great exploration potential for shale oil. However, current research on the sedimentation rate of the second member of the Funing Formation shale, whether the second member of the Funing Formation shale was influenced by diagenesis in later stages, the structural background, protolith properties, and provenance direction of the source area of the second member are relatively weak. This seriously constrains the further exploration of shale oil in the second member of the Funing Formation. In this study, the key shale of the second member of the Funing Formation, Gaoyou Sag, in the Subei Basin, was studied. The geochemical characteristics of rare earth elements were examined, and their significance in the diagenesis and sedimentary environment was discussed, along with the provenance characteristics of the second-member shale of the Funing Formation in the Subei Basin. The results show that the light rare earth elements are abundant, while the heavy rare earth elements are insufficient in the second member of the Funing Formation. The distribution curve is evident to the right; the negative Eu anomaly is evident, and the positive Ce anomaly is weak. The sedimentary environment of the second member of Funing Formation in Gaoyou Sag of the Subei Basin is a relatively stable anoxic reduction environment; the longitudinal REDOX conditions do not change significantly, and the sedimentation rate gradually decreases from bottom to top. Moreover, the tectonic background of the second member of the Funing Formation is an active continental margin related to a continental island arc. The parent rock is a mixture of sedimentary rocks and granite formed from felsic/basic materials in the continental crust. Its provenance mainly originates from the joint contribution of the Sulu orogenic belt in the northwest of the Subei Basin, the Dabie Mountain orogenic belt in the west, and the Zhangba Ridge uplift in the southwest. |
| keywords:Subei Basin Gaoyou Sag the second member of Funing Formation rare earth element sedimentary environment provenance |
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