石油学报 ›› 2010, Vol. 31 ›› Issue (4): 573-578.DOI: 10.7623/syxb201004009

• 地质勘探 • 上一篇    下一篇

琼东南盆地渐新统烃源岩微观沉积特征与沉积环境

刘传联   

  1. 同济大学海洋地质国家重点实验室  上海  200092
  • 收稿日期:2010-01-11 修回日期:2010-03-22 出版日期:2010-07-25 发布日期:2010-09-25
  • 通讯作者: 刘传联
  • 作者简介:刘传联,男,1963年2月生,1998年获同济大学海洋地质专业博士学位,现为同济大学海洋与地球科学学院、海洋地质国家重点实验室教授、博士生导师,主要从事海洋地质研究工作。
  • 基金资助:

    国家重点基础研究发展规划(973)项目(2009CB219400)、国土资源部全国油气资源战略调查与评价项目(XQ-2004-05)和国家科技重大专项(2008ZX05025)联合资助。

Sedimentary environment and micro-sediment characteristics of Oligocene source rocks in Qiongdongnan Basin

LIU Chuanlian   

  • Received:2010-01-11 Revised:2010-03-22 Online:2010-07-25 Published:2010-09-25

摘要:

利用背散射电子成像(BSEI)技术对琼东南盆地渐新统崖城组和陵水组烃源岩微观沉积特征进行了高分辨率研究。结果显示,渐新统烃源岩中的有机质成分既有海相化石,如有孔虫和钙质超微化石,又有丝状或纹层状有机质,还有陆源搬运而来的植物碎屑。这些有机质在烃源岩中的分布极不均匀,有些呈连续纹层状分布,有些呈断续纹层状分布,有些呈分散状均匀散布在矿物颗粒中,还有些则呈团块状或絮凝状分布。根据有机质成分及分布形式,并结合烃源岩沉积结构和构造,将琼东南盆地渐新统烃源岩划分为含连续纹层状有机质泥岩、含断续纹层状有机质泥岩、含有孔虫和钙质超微化石泥岩、含陆源植物碎屑泥岩和含分散状有机质泥岩5种类型。同时,根据钙质超微化石组合变化和微观沉积特征,推测琼东南盆地渐新世总体为滨岸、滨海和浅海沉积环境。

关键词: 琼东南盆地, 渐新统, 烃源岩, 背散射电子成像, 钙质超微化石, 沉积环境

Abstract:

High resolution study on the source rocks in Yacheng Formation and Lingshui Formation of Qiongdongnan Basin was carried out by using the backscattered electron imaging (BSEI) technology. The study results show that the organic matters of these source rocks include foraminifers, calcareous nannofossils, organic matter lamination and terrigenous plant debris. The organic matters were distributed in source rocks with four types of continuous lamination, intermittent lamination, scatter and flocculation. According to the composition and distribution characteristics of organic matters, five types of source rocks in Qiongdongnan Basin can be subdivided, including the continuous lamination mudstone, intermittent lamination mudstone, foraminiferal and calcareous nannofossil mudstone, terrigenous plant debris mudstone and scattering organic matter mudstone. The quantitative analysis on calcareous nannofossil of the Oligocene rock samples obtained from 5 wells was carried out. According to the nannofossil assemblages, abundance and diversity, it is suggested that the sedimentary environments of the Oligocene source rocks are the littoral environment and shallow sea environment.

Key words: Qiongdongnan Basin, Oligocene, source rocks, backscattered electron imaging technology, calcareous nannofossils, sedimentary environment