新疆石油地质

新疆石油地质 ›› 2007, Vol. 28 ›› Issue (3): 324-326.

• 油气勘探 • 上一篇    下一篇

英吉苏凹陷原油碳同位素地球化学特征及其地质意义

袁法祥1,2, 孙永革1   

  1. 1.中国科学院 广州地球化学研究所 有机地球化学国家重点实验室, 广州 510640;
    2.中国石油 工程建设集团公司, 北京 100011
  • 收稿日期:2006-06-20 修回日期:2006-10-23 出版日期:2007-06-01 发布日期:2020-07-31
  • 作者简介:袁法祥(1967-), 男, 山东潍坊人, 工程师, 环境地球化学,(Tel) 13609080067(E-mail) ygsun@gig.ac.cn.
  • 基金资助:
    国家973项目, 中国西部典型叠合盆地多重烃源灶形成演化及其有效性(2006CB202303)资助

Carbon Isotopic Geochemistry of Crude Oil from Yingjisu Sag in Tarim Basin and Its Implication

YUAN Fa-xiang1,2, SUN Yong-ge1   

  1. 1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, Guangdong 510640,China;
    2. Engineering & Construction Group Corp., PetroChina, Beijing 100011, China
  • Received:2006-06-20 Revised:2006-10-23 Online:2007-06-01 Published:2020-07-31

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摘要： 塔里木盆地英吉苏凹陷目前所揭示原油分子碳同位素分布呈现明显二阶段模式,显示该地区具两期成藏特征:一期为以龙口1井为代表的正常原油成藏,油源主要与下奥陶统沉积有关(以英东2井4171-4175m地层为对比源岩);另一期为以英南2井为代表的高演化凝析油气成藏,其轻烃组成可能属于干酪根高演化阶段产物,而非原油裂解成因。

关键词: 塔里木盆地, 英吉苏凹陷, 碳同位素, 干酪根, 裂解

Abstract: A two-stage mode of stable carbon isotopic profile of n-alkanes from crude oil in the Yingjisu sag of Tarim basin has been revealed, featuring a two-phase hydrocarbon accumulation process to date in this region. The first phase is related to the peak oil generation and accumulation of Lower Ordovician source rocks and exemplified by Well Longkou-1. The second phase is characterized by the highly matured condensate reservoirs exemplified by Well Yingnan-2. The distribution of light hydrocarbons in condensates shows that it is possibly derived from the high evolution stage of kerogen rather than from crude cracking.

Key words: Tarim basin, Yingjisu sag, carbon isotope, kerogen, cracking

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