廊固凹陷古近系沙河街组古湖泊环境与有机质富集机制

刁帆; 金凤鸣; 郝芳; 孙冶华; 邹华耀; 王元杰; 张金峰; 操义军

doi:10.11781/sysydz201404479

廊固凹陷古近系沙河街组古湖泊环境与有机质富集机制

doi: 10.11781/sysydz201404479

1.
中国石油大学(北京) 地球科学学院, 北京 102249
2. 中国石油华北油田勘探开发研究院, 河北任丘 062552
3. 中国地质大学(武汉), 武汉 430074

基金项目: 中国石油天然气股份有限公司科技项目（2011D-0703）和国家科技重大专项“大型油气田及煤层气开发”（2011ZX05006）共同资助。

详细信息

作者简介:
刁帆（1984—），男，博士生，从事石油地质研究。E-mail: diaofan821@126.com。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2014-01-03
- 修回日期: 2014-06-05
- 刊出日期: 2014-07-28

Palaeolake environment and organic matter enrichment mechanism of Paleogene Shahejie Formation in Langgu Sag

1.
College of Geosciences, China University of Petroleum, Beijing 102249, China
2. Exploration and Development Research Institute, PetroChina Huabei Oilfield Company, Renqiu, Hebei 062552, China
3. China University of Geosciences, Wuhan, Hubei 430074, China

摘要

摘要: 通过对廊固凹陷古近系沙四—沙三下亚段泥岩样品的元素地球化学、有机地球化学和同位素地球化学分析，结合湖泊的发育演化和古气候变化特征，探讨湖泊演化过程中水体盐度、氧化还原条件和生产力变化及其有机质富集机制。廊固凹陷在湖泊形成期（沙四段）湖盆构造活动弱，气候干热，湖泊水体盐度高，易形成盐跃层，使底层水处于稳定的缺氧条件，表层水体古生产力较低，有机质富集程度低；在湖泊鼎盛阶段（沙三下亚段）盆地强烈下陷，气候暖湿，湖泊水体为淡水，底层水体为弱还原环境，由于地表径流带来大量营养物质，表层水古生产力较高。湖相沉积物中有机质的富集程度受古湖泊不同演化阶段生产力和氧化还原条件的控制。沙四段有机质富集主要受底层水缺氧环境控制，沙三下亚段有机质富集与表层水的高生产力密切相关。
- 氧化还原条件 /
- 古生产力 /
- 有机质富集 /
- 古湖泊 /
- 廊固凹陷 /
- 渤海湾盆地
Abstract: According to the analyses of element geochemistry, organic geochemistry and isotope geochemistry of mudstone samples from the 4th member (Es⁴) and the lower subsection of the 3rd member (Es³) of the Shahejie Formation in the Langgu Sag, combined with the characteristics of lake evolution and climate change, it was discussed in this paper the changes of salinity, redox condition and productivity as well as the enrichment mechanisms of organic matter. During the formation stage (Es⁴), the lake was deposited in an inactive tectonic activity with arid climate, brackish water, stable water column stratification, water bottom anoxia and lower enrichment of organic matter. When the lake developed to the peak stage (the lower subsection of Es³), the basin subsided strongly with humid climate, fresh water and weak reducing environment in the bottom water. The productivity of surface water was high triggered by a great quantity of nutrients inflowed by direct runoff. The enrichment of organic matter in lacustrine sedimentation was controlled by the productivity and redox conditions during different lake evolution stages. In Es⁴, the enrichment of organic matter was mainly controlled by the anoxic environment in the bottom water, while in the lower subsection of Es³, it was closely related to the high productivity of surface water.
- redox condition /
- paleoproductivity /
- enrichment of organic matter /
- palaeolake /
- Langgu Sag /
- Bohai Bay Basin

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