石油学报 ›› 2011, Vol. 32 ›› Issue (2): 219-225.DOI: 10.7623/syxb201102005

• 地质勘探 • 上一篇    下一篇

南海北部第三系海相烃源岩

李友川 1  邓运华 2  张功成 1  傅  宁 1  孙玉梅 1   

  1. 1 中海油研究总院  北京  100027; 2 中国海洋石油总公司  北京  100010
  • 收稿日期:2010-05-27 修回日期:2010-09-20 出版日期:2011-03-25 发布日期:2011-05-25
  • 通讯作者: 李友川
  • 作者简介:李友川,男,1967年1月生,1993年获中国地质大学(北京)硕士学位,现为中海油研究总院高级工程师,主要从事油气地球化学研究工作。
  • 基金资助:

    国家重点基础研究发展规划(973)项目(2009CB219400)与国家科技重大专项(2008ZX05025)联合资助。

Tertiary marine source rocks in the northern South China Sea

LI Youchuan 1  DENG Yunhua 2  ZHANG Gongcheng 1  FU Ning 1  SUN Yumei 1   

  • Received:2010-05-27 Revised:2010-09-20 Online:2011-03-25 Published:2011-05-25

摘要:

孢粉组合及有机质组成等分析表明,南海北部第三系海相烃源岩的有机质主要来源于陆生高等植物,其形成与河流—三角洲和海岸平原等利于陆生高等植物发育的环境密切相关。平面上,盆地或凹陷边缘发育的海相烃源岩有机质丰度较高,而盆地或凹陷沉积中心的海相烃源岩有机质丰度较低。层序地层格架中的海侵体系域能够形成还原的沉积环境,有利于陆生高等植物来源的有机质保存及海相烃源岩的发育。珠江口盆地白云凹陷深水区已发现的原油明显存在珠海组海相烃源岩的贡献,海相烃源岩可能是南海北部深水区外围盆地的主要烃源岩。

关键词: 南海北部, 第三系, 海相烃源岩, 深水区, 油气勘探潜力

Abstract:

Spore-pollen assemblage and compositions of organic matter revealed that organic matter of Tertiary marine source rocks in the northern South China Sea mainly originated from terrestrial higher plants, and the formation of such source rocks was closely related with depositional environments favorable to the living of terrestrial higher plants, such as fluvial-delta, costal plain, etc.. Horizontally, marine source rocks deposited at the edge of a basin or depression generally had a high content of organic matter, but the content of organic matter was lower for marine source rocks deposited in the central part of a basin or depression, therefore, good marine source rocks with abundant organic matter occurred mainly in the edge area of a basin or depression. A transgressive system tract in the sequence stratigraphic framework could form a more reducing depositional environment that was preferable to the preservation of organic matter and could produce good marine source rocks. The study indicated that the marine source rock in the Zhuhai Formation contributed obviously to oils found in the deep-water area of the Baiyun Depression of the Pearl River Mouth Basin. Marine source rocks were probably the major source rock for adjacent basins or depressions of the deep-water area in the northern South China Sea.

Key words: northern South China Sea, Tertiary, marine source rock, deep-water area, potential of oil-gas exploration