石油勘探与开发 >

2018 , Vol. 45 >Issue 6: 1103 - 1114

DOI: https://doi.org/10.11698/PED.2018.06.19

学术讨论

塔里木盆地寒武系—下奥陶统烃源岩的端元油

  • 包建平 ,
  • 朱翠山 ,
  • 王志峰
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  • 长江大学油气资源与勘探技术重点实验室,地球化学系,武汉430100
包建平（1962-）,男,江苏张家港人,博士,长江大学资源与环境学院教授,主要从事油气地球化学研究与教学工作。地址：湖北省武汉市蔡甸区蔡甸街大学路111号,长江大学资源与环境学院,邮政编码：430100。E-mail：101064@yangtzeu.edu.cn

收稿日期: 2018-04-17

  修回日期: 2018-06-25

  网络出版日期: 2018-08-21

基金资助

国家自然科学基金（41772119,41272169）

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Typical end-member oil derived from Lower Ordovician-Cambrian source rocks in the Tarim Basin, NW China

  • BAO Jianping ,
  • ZHU Cuishan ,
  • WANG Zhifeng
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  • Key Laboratory of Oil & Gas Resource and Exploration Technology, Geochemistry Department, Yangtze University, Wuhan 430100, China

Received date: 2018-04-17

  Revised date: 2018-06-25

  Online published: 2018-08-21

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摘要

依据塔东2井和英买力与塔中地区海相原油饱和烃和芳烃馏份的GC-MS资料,重新确立了塔里木盆地寒武系—下奥陶统烃源岩的端元油。分析结果表明,塔东2井原油富含3~6环无烷基取代的多环芳烃,显示其经历过异常高温的改造;而完整的正构烷烃系列与25-降藿烷系列并存表明其是正常油与生物降解油的混源油,因此不宜作为寒武系烃源岩的端元油。塔中11井和塔中30井原油特征明显不同于英买101井和英买201井来源于中—上奥陶统烃源岩的原油,判断它们应该来源于寒武系—下奥陶统烃源岩,且这类原油中缺乏25-降藿烷系列,表明没有遭受生物降解的改造,满足端元油的地球化学条件。但值得注意的是两类海相原油中三芳甾烷和甲基三芳甾烷系列分布与组成十分相似,这与其甾烷和4-甲基甾烷系列形成了鲜明对照。三芳甲藻甾烷是塔里木盆地海相油源研究最常使用的一类标志物,它在塔东2井原油和过成熟海相烃源岩与两类成熟端元油中分布特征上的显著差异,表明它们易受成熟度的影响,因此在海相原油油源研究中应谨慎使用。图11表4参48

关键词： 生物标志物; 三芳甾类; 多环芳烃; 端元油; 塔里木盆地

本文引用格式

包建平 , 朱翠山 , 王志峰 . 塔里木盆地寒武系—下奥陶统烃源岩的端元油[J]. 石油勘探与开发, 2018 , 45(6) : 1103 -1114 . DOI: 10.11698/PED.2018.06.19

Abstract

Based on GC-MS data of saturated and aromatic fractions in crude oils from Well TD 2 and the Yingmaili and Tazhong area in the Tarim Basin, the end-member oil derived from Lower Ordovician-Cambrian source rocks was determined. The analytical results show that the crude oil from Well TD2 is rich in 3-6 ring polycyclic aromatic hydrocarbons without alkyl group, suggesting that this oil was altered by an abnormally thermal event. It contains a complete series of normal alkanes and 25-norhopanes, indicating that it is mixed oil of normal oil and biodegraded oil, so it can't be taken as end-member oil derived from Cambrian source rock. The characteristics of crude oils from Well TZ11 and TZ30 are different from the crude oils from Well YM101 and YM201 generated by Middle-Upper Ordovician source rocks, so it is inferred that they are derived from Lower Ordovician-Cambrian source rock. In addition, these crude oils don't contain 25-norhopanne series, indicating that they haven't suffered biodegradation, satisfying with geochemical conditions of end-member oil. It is noteworthy that the two kinds of marine oils have similar triaromatic steroids and triaromatic methyl steroids, but different C27-29 steranes and C28-30 methyl steranes. Triaromatic dinosteroids are a kind of biomarkers most usually used in marine oil-source correlation in the Tarim Basin, but the big differences in their distributions between crude oil from Well TD 2 and post-mature marine source rocks and two kinds of end-member oils suggest that they are easily affected by thermal maturity and should be cautiously used in marine oil-source correlation.

Key words： biomarkers; triaromatic steroids; polycyclic aromatic hydrocarbons; end-member oil; Tarim Basin

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