天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

里奥穆尼盆地上白垩统海相烃源岩地球化学特征及生烃潜力

曹军,钟宁宁,邓运华,康洪全,孙玉梅,刘岩,戴娜,朱顺玲,黄小艳   

  1. 1.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;2.中国海洋石油总公司研究总院,北京 100027; 3.长江大学计算机科学学院, 湖北 荆州 434023)
  • 收稿日期:2014-03-11 修回日期:2014-07-11 出版日期:2014-09-10 发布日期:2014-09-10
  • 作者简介:曹军(1983-),男,重庆忠县人,博士研究生,主要从事石油与天然气地球化学研究.E-mail:277847115@qq.com.
  • 基金资助:

    国家科技重大专项 “大陆边缘盆地类比与油气成藏规律研究”(编号:2011ZX05030-001)资助.

Characteristics and Hydrocarbon Potential of the Upper Cretaceous Source Rock in the Rio Muni Basin
 

CAO Jun,ZHONG Ning-ning,DENG Yun-hua,KANG Hong-quan,SUN Yu-mei,LIU Yan,DAI Na,ZHU Shun-ling,HUANG Xiao-yan   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;
    2.CNOOC Research Institute,Beijing 100027,China;3.College of Computer Science,Yangtze University,Jingzhou 434023,China.
  • Received:2014-03-11 Revised:2014-07-11 Online:2014-09-10 Published:2014-09-10

摘要:

里奥穆尼盆地油气勘探目前处于低勘探程度,盆地主力烃源岩主要是Aptian-Albian阶富有机质泥页岩和泥灰岩。然而,新区新钻井揭示上白垩统发育厚层灰色—灰黑色泥页岩,却从未引起足够关注。经详细的地球化学研究表明,该套泥页岩具有中等有机质丰度(TOC值为0.6%~2.24%,平均为1.03%),干酪根类型主要为Ⅱ型,其次是Ⅲ型,处于早成熟—成熟阶段;虽然显微组分证实存在明显的陆源有机质输入,然而干酪根类型却以Ⅱ2型为主,这可能是由于河流远距离搬运来的陆源有机质与海洋原地有机质混合,在搬运和沉积过程中遭受较强烈微生物改造,并且在海洋底层缺氧水体中,分散在矿物基质中得以保存,既有明显的倾油性,又有倾气性。通过盆地模拟表明,上白垩统Turonian阶海相烃源岩在始新世进入生油窗,至今仍处于主生烃期,该套烃源岩可能在向西斜坡凹陷区已经生成油气并聚集成藏。因此,上白垩统海相泥页岩是一套具有一定生烃潜力的烃源岩,特别是厚度较大的Turonian阶泥页岩是里奥穆尼盆地不可忽视的海相烃源岩。
 

关键词: 地球化学特征, 显微组分, 生烃潜力, 上白垩统, 里奥穆尼盆地

Abstract:

Exploration in the Rio Muni Basin is currently poor.The primary source rock within the Rio Muni Basin is the Aptian-Albian shale sequence that is the reported source for the oil fields.However,new drilling in the new district reveals that it developed a thick layer of gray-black shale in the Upper Cretaceous,but it has never attracted enough attention.A series of geochemical data demonstrated that the Upper Cretaceous shale is enriched in organic matter,which is at early mature-mature stage,with moderate abundance (TOC:0.6%-2.24%,average 1.03%) and fair quality (mainly type Ⅱ and Ⅲ).Although the maceral confirmed the presence of a large amount of terrestrial organic matter input,however,the kerogen type is dominated by type Ⅱ2.It is probably due to the far distance transportation of the terrigenerous organic matter by ancient rivers,and mixture with marine organic matter deposited in anoxic marine environment.So that the organic matter has sapropel features,and is both oil-prone and gas-prone.Basin modeling indicates that the Turonian of the Upper Cretaceous marine source rocks entered the oil window in the Eocene,and is still in the stage of primary hydrocarbon generation,the equivalent source rocks in the west slope depression may have generated hydrocarbon and accumulated.Thus,the Upper Cretaceous marine shale is a set of source rocks with good hydrocarbon generation potential,especially,the Turonian shale with large thickness is a set of good marine source rock in Rio Muni Basin.

 

 

 

 

 
 

Key words: Geochemical characteristics, Maceral, Hydrocarbon potential, Upper Cretaceous, Rio Muni Basin

中图分类号: 

  • TE122.1+1
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