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地球科学进展  2007, Vol. 22 Issue (3): 221-226    DOI: 10.11867/j.issn.1001-8166.2007.03.0221
研究论文     
柴达木盆地始新统沟鞭藻及其油源意义
吉利明1,李林涛1,2,吴 涛1,2张晓宝1,周世新1
1.中国科学院地质与地球物理研究所气体地球化学重点实验室,甘肃 兰州 730000; 2.中国科学院研究生院,北京 100069
Eocene Dinoflagellate in Qaidam Basin and Its Significance on Hydrocarbon Source
JI Li-ming1, LI Lin-tao1,2, WU Tao1,2,ZHANG Xiao-bao1,ZHOU Shi-xin1
1.Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Science,Lanzhou 730000,China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100069,China
 全文: PDF(157 KB)  
摘要:

我国中新生代陆相沉积,特别是咸化湖泊沉积中普遍发现属于“海源陆生”的沟鞭藻化石,由于其良好的生油特性,被认为是我国白垩纪—第三纪陆相油气资源的重要来源。柴达木盆地第三系始新统下干柴沟组是该地区最主要的烃源岩,生油岩及原油中富含公认的沟鞭藻生物标志物4-甲基甾烷和甲藻甾烷,但迄今该地区尚未发现可靠的沟鞭藻化石。本次研究在柴达木盆地北缘昆2井下干柴沟组发现了类型单调但化石丰富的以Subtilisphaera为主的沟鞭藻化石组合,为肯定柴达木盆地第三系原油沟鞭藻的贡献提供了直接化石证据。研究表明,沟鞭藻发育的第三系中始新统可能是本地区最有利的生油层,形成于湿热气候所控制的陆相咸水湖泊。

关键词: 沟鞭藻烃源岩始新统柴达木盆地下干柴沟组    
Abstract:

Nonmarine fossil dinoflagellates with marine origin have been found widely  from the Mesozoic-Cenozoic terrigenous, especially salty lacustrine sediments in China. Because of the characteristic of dinoflagellates in favorable oil-generating, they are considered as an important hydrocarbon resource of nonmarine Cretaceous-Tertiary in China. The Eocene Lower Ganchaigou Formation is the uppermost hydrocarbon source rock in Qaidam basin. Abundant 4-methylsteranes and dinosteranes, which are generally thought to be biomarkers of dinoflagellates, were preserved in the hydrocarbon source rocks and crude oils. However, no reliable fossil dinoflagellates have been discovered in the area heretofore. This paper reports the new finding of fossil dinoflagellates from the Eocene Lower Ganchaigou Formation in Qiadam basin. A monotype but comparatively abundant dinoflagellate assemblage was recovered from the Formation of Well Kun-2 in the north margin of Qiadam basin. The assemblage mainly consists of abundant cysts of Subtilisphaera, and shows obviously nonmarine characteristics. All these provide direct evidence for dinoflagellates as an important source of Tertiary hydrocarbon in Qiadam basin. The studies indicated the Middle Eocene in which dinoflagellates were discovered might be is the most favorable hydrocarbon source rocks in Qaidam basin, and the sedimentary environment was a salty lake in wet and hot climate. 

Key words: Qaidam basin.    Dinoflagellate    Hydrocarbon source rock    Lower Ganchaigou Formation    Eocene
收稿日期: 2006-10-10 出版日期: 2007-03-10
:  P618.13  
基金资助:

中国科学院科技支青工程项目“构造岩性油气藏预测技术及其在柴西南地区的应用”(编号:2006-06)资助.

通讯作者: 吉利明(1963-),男,陕西咸阳人,副研究员,主要从事微体古生物学与石油地质学研究.E-mail:jilimin@lzb.ac.cn     E-mail: jilimin@lzb.ac.cn
作者简介: 吉利明(1963-),男,陕西咸阳人,副研究员,主要从事微体古生物学与石油地质学研究.E-mail:jilimin@lzb.ac.cn
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引用本文:

吉利明,李林涛,吴涛,张晓宝,周世新. 柴达木盆地始新统沟鞭藻及其油源意义[J]. 地球科学进展, 2007, 22(3): 221-226.

JI Li-ming, LI Lin-tao, WU Tao,ZHANG Xiao-bao,ZHOU Shi-xin. Eocene Dinoflagellate in Qaidam Basin and Its Significance on Hydrocarbon Source. Advances in Earth Science, 2007, 22(3): 221-226.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2007.03.0221        http://www.adearth.ac.cn/CN/Y2007/V22/I3/221

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