东海盆地西湖凹陷平湖斜坡带平北区始新统宝石组沉积环境及沉积相类型

蒋一鸣; 赵洪; 唐贤君; 姜雪; 徐振中

doi:10.11781/sysydz2025050941

东海盆地西湖凹陷平湖斜坡带平北区始新统宝石组沉积环境及沉积相类型

doi: 10.11781/sysydz2025050941

中海石油(中国)有限公司上海分公司, 上海 200335

基金项目:

国家自然科学基金项目(42430806)、中海石油(中国)有限公司上海分公司生产性科研项目(SCKY-2024-YJY07)和中海石油(中国)有限公司重大科技专项(KJZX-2023-0101)联合资助。

详细信息

作者简介:
蒋一鸣(1983—)，男，高级工程师，从事石油地质研究。E-mail:jiangym2@cnooc.com.cn。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2024-02-24
- 修回日期: 2025-08-05
- 刊出日期: 2025-09-28

Sedimentary environment and facies types of Eocene Baoshi Formation in Pingbei area, Pinghu slope belt, Xihu Sag, East China Sea Basin

Shanghai Branch, CNOOC China Limited, Shanghai 200335, China

摘要

摘要: 东海盆地西湖凹陷平湖斜坡带平北区始新统宝石组沉积环境与沉积相认识不清，制约了对该区宝石组储层与烃源岩的评价，阻碍了油气勘探进程。在对宝石组地层重新厘定的基础上，综合运用古生物学、微量元素分析、岩心观察、粒度分析与测井相分析等方法，对研究区9口井的宝石组沉积环境和沉积相进行了系统研究，明确了宝石组沉积相类型。研究表明，平北区宝石组藻类和孢粉含量低，孢粉以喜湿蕨类孢子为主，沟鞭藻、钙质超微化石和有孔虫等海相化石含量较少，表明宝石组沉积时期为半咸水的海陆过渡相，以温暖、湿润气候为主。Sr、Ba、Ni和V等元素的综合分析表明，宝石组沉积时期为弱还原的贫氧环境；相对于天台斜坡带，平北区淡水陆相化石相对较多，为相对局限的海陆交互沉积环境。研究区不同的构造带沉积环境与沉积相有所差异：孔雀亭构造带宝石组主要发育三角洲沉积相，主要发育水下分流河道、河口坝及水下分流间湾微相，席状砂发育较少；宝云亭与武云亭构造带宝石组沉积于受局部海水影响的沉积环境，发育潮坪相，主要发育潮间带砂体，潮间带主要发育潮道、砂坪、混合坪及泥坪沉积微相；在西部斜坡带南部的天台斜坡带发育大套厚层泥岩，代表局限海沉积，其分布范围较小。
- 沉积相 /
- 沉积环境 /
- 平北区 /
- 平湖斜坡带 /
- 宝石组 /
- 西湖凹陷 /
- 东海盆地
Abstract: The unclear understanding of the sedimentary environment and facies of the Baoshi Formation in the Pingbei area of the Pinghu slope belt, Xihu Sag, East China Sea Basin, has restricted the evaluation of the Baoshi Formation reservoirs and source rocks in this area, and hindered the progress in oil and gas exploration. Based on the redefinition of the Baoshi Formation strata, a systematic study of the sedimentary environment and facies of the Baoshi Formation from nine wells in the study area was conducted by integrating paleontology, trace element analysis, core observation, grain size analysis, and logging facies analysis. The types of sedimentary facies in the Baoshi Formation were clarified. The results showed that the Baoshi Formation in the Pingbei area had low contents of algae and palynomorphs, with hygrophilous fern spores being dominant. A small number of dinoflagellates, calcareous nannofossils, and foraminifera were present. These features indicated that during the deposition of the Baoshi Formation, the environment was a brackish marine-continental transitional setting under predominantly warm and humid climatic conditions. Comprehensive analysis of Sr, Ba, Ni, and V indicated that the Baoshi Formation was deposited under a weakly reducing, suboxic environment. Compared with the Tiantai slope belt, more freshwater terrestrial fossils were found in the Pingbei area, suggesting a relatively restricted transitional sedimentary environment between land and sea. The sedimentary environment and facies varied across different structural zones in the study area. In the Kongqueting structural zone, the Baoshi Formation was mainly characterized by deltaic sedimentary facies, primarily consisting of underwater distributary channels, mouth bars, and interdistributary bay microfacies, with limited development of sheet sand bodies. In the Baoyunting and Wuyunting structural zones, the Baoshi Formation was deposited in an environment influenced by local seawater, where tidal flat facies and intertidal sand bodies were developed. The intertidal zone mainly contained tidal channels, sand flats, mixed flats, and mud flats as depositional microfacies. In the southern part of the western slope belt, the Tiantai slope belt developed thick mudstone layers, suggesting restricted marine deposition with a relatively limited spatial distribution.
- sedimentary facies /
- sedimentary environment /
- Pingbei area /
- Pinghu slope belt /
- Baoshi Formation /
- Xihu Sag /
- East China Sea Basin

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