天然气地球科学

• 天然气地质学 • 上一篇    下一篇

琼东南盆地深水区东段中中新世深水扇发育特征及物源分析

李超,陈国俊,张功成,吕成福,杨海长,马明,韩银学,毕广旭   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    2.中海油研究总院,北京 100028;3.中国科学院大学,北京 100049
  • 收稿日期:2017-04-19 修回日期:2017-08-16 出版日期:2017-10-10 发布日期:2017-10-10
  • 通讯作者: 陈国俊(1967-),男,甘肃武威人,研究员,博士生导师,主要从事储层沉积学研究. E-mail:gjchen@lzb.ac.cn
  • 作者简介:李超(1987-),男,宁夏中宁人,助理研究员,博士,主要从事沉积地质学研究. E-mail:lichaomails@lzb.ac.cn.
  • 基金资助:

    国家科技重大专项(编号:2016ZX05026-007-05);中国科学院油气资源研究重点实验室青年创新基金项目(编号:KFJJ2015-02)联合资助.

Developmental characteristics and provenances of the submarine fans developed duringthe Middle Miocene in the eastern deepwater area of the Qiongdongnan Basin

Li Chao,Chen Guo-jun,Zhang Gong-cheng,Lü Cheng-fu,Yang Hai-zhang,Ma Ming,Han Yin-xue,Bi Guang-xu   

  1. 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;2.CNOOC Research Institute,Beijing 100028,China;3.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2017-04-19 Revised:2017-08-16 Online:2017-10-10 Published:2017-10-10

摘要:

深水扇是重力流搬运陆架—上陆坡沉积物至深海平原的结果,不仅记录了区域古气候环境、构造运动、相对海平面变化信息,也储集了巨量的油气资源,开展深水扇识别和发育特征研究同时具有科学意义和实践意义。应用新采集的大量三维地震数据,结合钻井和稀土元素数据,分析了琼东南盆地宝岛—长昌凹陷深水扇的发育特征和沉积物源,并总结了影响该深水区深水扇发育和分布的主要因素。研究表明,琼东南盆地宝岛—长昌凹陷中中新统梅山组发育多个深水扇,依据沉积微相组合可以划分为3类,包括陆坡峡谷—朵叶体型深水扇、深水水道—朵叶体型深水扇、深水水道化深水扇。陆坡峡谷—朵叶体型深水扇和深水水道化深水扇分别发育于宝岛凹陷和长昌凹陷北缘,物源来自海南隆起区。深水水道—朵叶体型深水扇发育于长昌凹陷南缘,物源来自凹陷南东方向的永乐隆起区。影响宝岛—长昌凹陷中中新世深水扇发育和分布的主要因素包括陆架地形和古水深、坡折带类型和坡度、古海底地貌和相对海平面下降等。

关键词: 琼东南盆地, 中中新统, 深水扇, 发育特征, 物源

Abstract:

Submarine fans are sedimentary results that gravity flow transports shelf and upper slope sediments to deep-sea plains.These sediments can not only accumulate large amounts of oil and gas resources,but can also archive enormous amounts of climatic and regional structural information.Therefore,the study on the identification and development characteristics of the submarine fan has both scientific and practical significance.Using the newly acquired large amount of 3D seismic data,combined with drilling and REE data,the developmental characteristics and sediment sources of the submarine fans in the Baodao and Changchang Depression of the Qiongdongnan Basin are analyzed,and the main factors affecting the development and distribution of the submarine fans in the deepwater area are summarized.According to the sedimentary microfacies combination,there are three types of submarine fans,which include deepwater canyon-lobe,deepwater channel-lobe,deepwater channelized submarine fan developed in the Baodao and Changchang Depression of the Qiongdongnan Basin during the Middle Miocene.The submarine fan which consists of the canyon and lobe and deepwater channelized fan are located in the north part of the Baodao and Changchang Depression,and the provenance is Hainan Island.The submarine fan consisting of the deepwater channel and lobe is located in the south part of the Changchang Depression,and the provenance is Yongle Uplift.The main factors affecting the development and distribution of the submarine fan in the Middle Miocene of the Baodao and Changchang Depression include continental shelf topography and paleo-water depth,slope break type,paleo-seabed topography and relative sea-level decline.
 

Key words: Qiongdongnan Basin, Middle Miocene, Submarine fan, Developmental characteristics, Source

中图分类号: 

  • TE122.2

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