Crude oil,Geochemical characteristics,Steranes,Hopanes,Origin material,Depositional environment,Oil source,"/> 鄂尔多斯盆地吴起地区长9段和长10段原油地球化学特征对比

天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

鄂尔多斯盆地吴起地区长9段和长10段原油地球化学特征对比

王钊,周新平,李树同,李士祥,邱军利,张文选,王琪   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州730000;2.中国科学院大学, 北京100049;3.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018
  • 收稿日期:2017-03-21 修回日期:2017-07-16 出版日期:2017-09-10 发布日期:2017-09-10
  • 通讯作者: 邱军利(1975-),男,河南焦作人,副研究员,博士,主要从事油气地球化学研究. E-mail:qiukangjun@163.com.
  • 作者简介:王钊(1987-),男,河北任丘人,硕士研究生,主要从事储层地质研究. E-mail:wangzhao9333@126.com.
  • 基金资助:

    国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05007-004)资助.

Comparative study on geochemical characteristics of Chang 9  and Chang 10 crude oils in the Wuqi Oilfield,Ordos Basin

Wang Zhao,Zhou Xin-ping,Li Shu-tong,Li Shi-xiang,Qiu Jun-li,Zhang Wen-xuan,Wang Qi   

  1. 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Exploration and Development Institute of Changqing Oilfield Company, PetroChina,Xi’an 710018,China
  • Received:2017-03-21 Revised:2017-07-16 Online:2017-09-10 Published:2017-09-10

摘要:

鄂尔多斯盆地吴起地区延长组长9油层组和长10油层组的源储特征存在较大争议。针对这一问题,通过地球化学测定方法,对该地区长9段原油和长10段原油的地球化学特征进行了精细对比和解剖,研究发现:长9段原油地球化学特征变化较大,其正构烷烃具有双峰和单峰2种类型,C27—C29甾烷呈倒“L”型分布,表现出明显的高等植物输入特征,说明母质来源广泛。长10段原油正构烷烃呈单峰分布,C27—C29甾烷呈“V”型分布,母质来源基本上均为水生微生物,并且来源集中。结合碳同位素特征判断长9段—长10段原油形成于淡水弱还原—弱氧化环境中。综合以上特征推断出长9段原油和长10段原油可来源于不同的烃源岩。它们具有完全不同、相对独立的油源。长9段原油部分来自长7段上部烃源岩。该发现将为延长组下组合的成藏机理研究提供帮助。
 

关键词: 原油, 地球化学特征, 甾烷, 藿烷, 母质来源, 沉积环境, 油源

Abstract:

There are great disputes about the source and reservoir characteristics of Chang 9 oil-bearing formation and Chang 10 oil-bearing formation in Yanchang Formation,Ordos Basin.Aiming at this problem,the geochemical characteristics of crude oil in Chang 9 reservoirs and Chang 10 reservoirs were finely contrasted and dissected.The study showed that geochemical characteristics of crude oil in Chang 9 reservoir ranged obviously.The distribution of n-alkanes resented two types:Single-peak or double-peak carve;The structure of the sterane is reversed “L” type distribution,which showed obvious characteristics of higher plant input,indicating a wide range of parent material;The distribution of n-alkanes in Chang10 reservoir showed single-peak distribution.The structure of the sterane is “V” type distribution,showing the sources of parent material were mainly aquatic microorganisms,and the sources were relatively concentrated.Combined with carbon isotope characteristics,it can be judged that the Chang 9-Chang 10 crude oils were formed in the weak reductive weak oxidation environment with fresh water.Based on the above characteristics,it is concluded that the crude oil of Chang 9 and Chang 10 can be derived from different source rocks.They have completely different and relatively independent source reservoir characteristics.Chang 9 crude oil was partly sourced from the upper part of Chang 7 source rock,which will be helpful to the study of reservoir forming mechanism in the lower Yanchang Formation.
 

Key words: Crude oil')">

中图分类号: 

  • TE122.1+13

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