| 苏北盆地高邮凹陷阜二段页岩稀土元素特征及地质意义 |
| 投稿时间：2024-08-29 修订日期：2024-12-23 点此下载全文 |
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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；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的共同贡献。 |
| 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 Funing Formation is the main source rock group and exploration focus in Subei Basin. In recent years, the successful trial production of shale oil horizontal wells such as HY1 in Gaoyou Sag has shown great shale oil exploration potential. 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, and the structural background, protolith properties, and provenance direction of the source area of the second member of the Funing Formation shale is relatively weak. This seriously constraints further exploration of the shale oil in the second member of the Funing Formation. In this paper, the key shale of the second member of Funing Formation, Gaoyou Sag, Subei Basin, is studied. The geochemical characteristics of rare earth elements are studied, and the significance of rare earth elements on the diagenesis, sedimentary environment and provenance characteristics of the second member shale of Funing Formation, Subei Basin is discussed. The results show that light rare earth elements are abundant and heavy rare earth elements are insufficient in the second member of Funing Formation in Gaoyou Sag, Subei Basin. The distribution curve is obvious to the right, the Eu negative anomaly is obvious, and the Ce positive anomaly is weak. The sedimentary environment of the second member of Funing Formation in Gaoyou Sag of Subei Basin is relatively stable anoxic reduction environment, the longitudinal REDOX conditions do not change significantly, and the sedimentation rate gradually decreases from bottom to top. The tectonic background of the second member of Funing Formation in Gaoyou Sag of Subei Basin is an active continental margin related to continental island arc. The parent rock is a mixture of sedimentary rock and granite, formed from felsic/basic material in the continental crust. Its provenance mainly comes from the joint contribution of Sulu orogenic belt in the northwest of Subei Basin, Dabie Mountain orogenic belt in the west and 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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