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天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

塔北隆起中部原油轻烃地球化学特征及其意义

常象春,王铁冠，程  斌，王  鑫，邓冰红   

  1. 1.山东科技大学沉积成矿作用与沉积矿产山东省重点实验室，山东 青岛 266590; 2.中国石油大学(北京)油气资源与探测国家重点实验室，北京 102249)
  • 收稿日期:2013-10-18 修回日期:2013-12-01 出版日期:2014-07-10 发布日期:2014-07-10
  • 作者简介:常象春(1974-)，男，陕西绥德人，教授,博士，主要从事油气地质与地球化学研究.
  • 基金资助:

    国家自然科学基金项目(编号:41272139);山东省自然科学杰出青年基金项目(编号:JQ201311);教育部科学技术重点项目(编号:212100);山东科技大学科技计划项目(编号:2010KYTD103;2012KYJQ101)联合资助.

Geochemical Characteristics of Light Hydrocarbons from the  Central Part of Tabei Uplift and Their Implications

CHANG Xiang-chun,WANG Tie-guan,CHENG Bin,WANG Xin,DENG Bing-hong   

  1. 1.Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology,Qingdao 266590,China； 2.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China
  • Received:2013-10-18 Revised:2013-12-01 Online:2014-07-10 Published:2014-07-10

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311

摘要：

对塔北隆起中部27个原油样品进行了轻烃地球化学分析，结果表明这些不同区块、不同层位、不同产状原油C5—C7与C7轻烃组成非常接近，原油母质高度相似，均反映典型的海相成因、主要源自藻类和细菌等低等生物。轻烃2-MH/3-MH值和Pr/Ph值具有较好的正相关性，指示其沉积环境介质条件可能存在细微差异。庚烷值和异庚烷值分别介于22.97%～37.37%和1.04～4.06之间，原油生成温度为119.03~130.89℃，表明属于高成熟原油。混有早期生物降解原油的多期充注成藏，使得轻烃组成揭示的仅为晚期正常原油的地质地球化学信息。

关键词: 原油, 轻烃参数, 成熟度, 生物降解, 塔北隆起

Abstract:

Geochemical characteristics of light hydrocarbons for 27 crude oils from Tabei Uplift were investigated.The results show that the source input was highly similar for their roughly equal compositions of C5-C7 and C7 light hydrocarbons,despite they were sampled from different horizons of different oilfields with variable occurrence.It is suggested that those oils were of marine origin and mainly sourced from algae and bacteria.The 2-MH/3-MH ratio correlates well with the Pr/Ph ratio,implying the subtly different media conditions of sedimentary environment.Heptane and isoheptane values are 22.97%-37.37% and 1.04-4.06 respectively,indicating a high maturity of oils,associated with the high hydrocarbon-generating temperature (119.03-130.89℃).Due to the severe biodegradation of early charged oil,light hydrocarbons from mixed oils with multi-stage charging only delineate the geochemical implications of late charged fresh oil.

Key words: Crude oil, Light hydrocarbon parameter, Maturity, Biodegradation, Tabei Uplift

中图分类号: 

  • TE122.1+13

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