古地理学报 ›› 2022, Vol. 24 ›› Issue (1): 73-84. doi: 10.7605/gdlxb.2022.01.006

• 海洋古地理专辑 • 上一篇    下一篇

南海北部白垩纪—渐新世早期沉积环境演变及构造控制*

吴哲1, 张丽丽1, 朱伟林2, 邵磊2, 杨学奇1   

  1. 1 中海石油(中国)有限公司深圳分公司,广东深圳 518054;
    2 同济大学 海洋地质国家重点实验室,上海 200092
  • 收稿日期:2021-07-30 修回日期:2021-12-06 出版日期:2022-01-01 发布日期:2022-01-24
  • 作者简介:吴哲,男,1986年生,博士,高级工程师,主要从事海洋石油地质、含油气盆地分析研究。E-mail: wuzhe3@cnooc.com.cn。
  • 基金资助:
    *国家科技重大专项(编号: 2016ZX05026-003-008),中海油综合科研项目“南海东部大中型天然气田勘探潜力与突破方向”以及国家自然科学基金项目(编号: 42076066,92055203)联合资助;

Sedimentary environment evolution and tectonic evolution of the Cretaceous to early Oligocene in northern South China Sea

Wu Zhe1, Zhang Li-Li1, Zhu Wei-Lin2, Shao Lei2, Yang Xue-Qi1   

  1. 1 Shenzhen Branch of CNOOC Ltd.,Guangdong Shenzhen 518054,China;
    2 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China
  • Received:2021-07-30 Revised:2021-12-06 Online:2022-01-01 Published:2022-01-24
  • About author:Wu Zhe,born in 1986,Ph.D., is a senior engineer. He is mainly engaged in marine petroleum geology and analysis of petroliferous basins. E-mail: wuzhe3@cnooc.com.cn.
  • Supported by:
    Co-funded by the National Science and Technology Major Projects(No.2016ZX05026-003-008),Comprehensive scientific research project of China National Offshore Oil Corporation and the National Natural Science Foundation of China under contract(Nos. 42076066, 92055203)

摘要: 南海北部珠江口—琼东南盆地白垩系—下渐新统记录了华南大陆边缘从主动陆缘向被动陆缘的转换过程。基于盆地构造-地层、单井相、地震相等特征的综合分析,结合南海中南部的沉积环境和区域构造演化,探讨南海北部白垩纪—渐新世早期的沉积环境演变及构造控制背景。研究发现: (1)南海北部白垩系广泛分布,古新统分布极为有限; 始新世早-中期,琼东南盆地只在部分凹陷深部发育了小规模的滨浅湖相和扇三角洲相沉积,珠江口盆地白云凹陷以大规模发育的湖泊相为特征; 始新世晚期—渐新世早期,琼东南盆地和珠江口盆地白云凹陷都受到海侵作用的影响,以海岸平原相和滨浅海相为主。 (2)构造演变包括5期:包括白垩纪安第斯型大陆边缘的“弧—盆”体系发育期,古新世区域隆升剥蚀山间盆地发育期,始新世早-中期裂陷发育,始新世晚期—渐新世早期陆缘破裂期,渐新世晚期东部海盆稳定扩张期。最后,探讨了南海盆地中生代末/新生代初的动力学转换过程及特征。

关键词: 南海, 珠江口盆地, 琼东南盆地, 沉积环境, 构造古地理

Abstract: During the Cretaceous to early Oligocene,the northern South China Sea(SCS)experienced a significant transition from Andean-type to passive Pacific-type continental margin,which was faithfully recorded in sedimentary strata. By combining the regional tectonic background of the southern SCS,we reconstructed the sedimentary and tectonic history of the northern SCS from the Cretaceous to early Oligocene,based on basin analysis,well logging and seismic interpretation. (1)The Cretaceous are widely distributed in the northern South China Sea,but the distribution of Paleocene is very limited. During the early-middle Eocene,the Qiongdongnan Basin developed small-scale,shore-lacustrine and delta fan facies within local deep sags,whereas the Baiyun Depression formed extensive lacustrine facies. During the late Eocene-early Oligocene,the Qiongdongnan Basin and Baiyun Depression were both influenced by the SCS transgression,and widely developed shore-neritic and coastal plain strata. (2)The tectonic evolution includes five stages: This study provides detailed discussion and comparison on the development of the Andean-type continental margin of the Cretaceous,the development of mountain basin and palaeo-orogenic belts of the Paleocene,rifting processes during the early-middle Eocene,break-up unconformity of the late Eocene-early Oligocene,and the final seafloor spreading during the eastern SCS in the late Oligocene. The study further discussed the Late Mesozoic/Early Cenozoic geodynamic transition and the Eocene marine sedimentary features.

Key words: South China Sea, Pearl River Mouth Basin, Qiongdongnan Basin, sedimentary environment, palaeogeography

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