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J4 ›› 2011, Vol. 17 ›› Issue (2): 249-259.

• 油气地质 • 上一篇    下一篇

塔里木盆地塔河油田石炭系、三叠系原油地球化学特征及成因研究

郑朝阳, 柳益群, 段毅, 于文修, 樊婷婷, 张学军   

  1. 大陆动力学国家重点实验室,西北大学 地质系
  • 收稿日期:2010-07-14 修回日期:2010-10-14 出版日期:2011-06-20 发布日期:2011-06-20
  • 作者简介:郑朝阳,1975年生,博士,主要从事石油地质、岩相古地理研究;E-mail:zzyhe@163.com
  • 基金资助:

      国家重点基础研究发展规划项目(2005CB422105)和中国石油化工股份公司项目(YPH08104)

Geochemical Characteristics and Genesis of Crude Oils of Carboniferous and Triassic in Tahe Oil field of Tarim Basin

 ZHENG Chao-Yang, LIU Yi-Qun, DUAN Yi, XU Wen-Xiu, FAN Ting-Ting, ZHANG Xue-Jun   

  1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University
  • Received:2010-07-14 Revised:2010-10-14 Online:2011-06-20 Published:2011-06-20
  • About author:Zheng Chaoyang, Ph.D. E-mail: zzyhe@163.com

摘要:

塔河油田是塔里木盆地迄今为止最大的海相碳酸盐岩油田,其成因备受关注。本文通过采样和气相色谱-质谱联用仪
(GC-MS)分析,研究了塔河油田石炭系和三叠系原油地球化学特征及成因,研究结果表明:原油中Pr/Ph比值相对较低,
Pr/nC17和Ph/nC18相关图反映其形成于还原环境;原油中含有相对丰富的伽马蜡烷和C30+藿烷,说明原油形成于海相咸水环
境;原油中含有丰富的三环萜、四环萜和较高的三环萜烷/藿烷,指示其母质来源为菌藻类;原油中重排甾烷/规则甾烷、Ts/
(Ts+Tm)和C29ββ/ (ββ+αα)参数值分别为0.24~0.40, 0.28~0.50和0.56~0.63,均指示原油为成熟原油;25-降藿烷的检
出说明原油受到一定的生物降解;油源对比研究表明塔河油田石炭系和三叠系原油主力烃源岩为中上奥陶统烃源岩。

关键词: 塔里木盆地, 石炭系, 三叠系, 原油地球化学

Abstract:

Because Tahe oil field is the largest marine carbonate rock oil field of the Tarim Basin, its genesis is of great interest.
By means of  to  the high-resolution GC-MS analysis of  the oil samples  from Carboniferous and Triassic Tahe oil  field,  this paper
studies biomarkers and discuss  their genesis. The Pr/Ph, Pr/nC17 and Ph/nC18 data  indicated  that oil  formed  from  sapropel
organic matters of reducing environment. Abundance of gammacerane C30+ hopane  indicates  that  the oils  formed  from saltwater
environment. The abundance of C27  sterane,  tricyclic  terpane,  tetracyclic  terpane, and higher  tricyclic  terpane vs hopane
parameters show that original source materials are homonemeaes. Rearranged sterane/sterane, Ts/(Ts+Tm), and C29ββ/(ββ+αα)
are 0.24~0.40,0.28~0.50 and 0.56~0.63,respectively. All of  these show  that  the maturity of  the oil  is high. The occurrence of
25-norhopane  indicates  that  the oil experienced some degree of biodegradation. Comparison of oil and source rock suggests  that
the oils of the main source rock came from the middle-upper Ordovician source rocks.

Key words: Tarim basin, Tahe oilfield, Carboniferous, Triassic, oil geochemistry

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