天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

塔里木台盆区寒武系烃源岩地球化学特征

杨福林,王铁冠,李美俊   

  1. 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:2015-09-05 修回日期:2015-10-22 出版日期:2016-05-10 发布日期:2016-05-10
  • 作者简介:杨福林(1987-),男,安徽宿州人,博士研究生,主要从事有机地球化学及油藏地球化学研究. E-mail:fulinyang2015@163.com.
  • 基金资助:
    国家自然科学基金(编号:41272158)资助.

Geochemical study of Cambrian source rocks in the cratonic area of Tarim Basin,NW China

Yang Fu-lin,Wang Tie-guan,Li Mei-jun   

  1. State Key Laboratory of Petroleum Resources and Prospecting,College of Geoscience,China University of Petroleum,Beijing 102249,China
  • Received:2015-09-05 Revised:2015-10-22 Online:2016-05-10 Published:2016-05-10

摘要: 对27件塔里木盆地台盆区寒武系烃源岩样品进行了有机碳测定、饱和烃色谱质谱、芳烃色谱质谱及馏分稳定碳同位素等分析以获取其生烃潜力与地球化学特征信息。结果显示烃源岩TOC值较高(0.5%~8.39%),属于较好—很好的烃源岩范畴。下寒武统烃源岩最好,其次为中寒武统。分子标志物分析表明烃源岩以菌藻类或低等水生生物来源为主。低姥植比、高硫芴含量表明沉积环境还原性较强。高伽马蜡烷含量指示了水体分层环境。三环萜烷发育完整,C21三环萜烷/C23三环萜烷大于1。甾烷相对含量高,C28/(C27+C28+C29)规则甾烷≥25%。寒武系烃源岩C26及C27三芳甾烷发育,三芳甲藻甾烷含量丰富。烃源岩可溶有机组分稳定碳同位素组成整体偏重,一般重于-31‰。柯坪隆起下寒武统肖尔布拉克剖面泥岩各指标均不同于其余寒武系烃源岩样品,暗示了不同的生源构成。

关键词: 塔里木盆地, 寒武系烃源岩, C28规则甾烷, 三芳甲藻甾烷, 碳同位素组成

Abstract: Despite that huge petroleum resources have been found reservoired in the Cambrian,Ordovician,Carboniferous and Triassic in the Central Tarim and Tabei Uplifts,source rocks of the marine petroleum in the Tarim Basin have still been disputed for decades.With the development of exploration and more discover of source rocks,it is necessary to conduct research on Cambrian source rocks comprehensively and in detail.On the basis of a series of regular geochemical analysis,including TOC(total organic carbon),GC-MS(Gas Chromatography-Mass Spectrometer) and stable carbon isotopic analysis,27 Cambrian source rocks collected from the Tarim Basin were analyzed to obtain information about hydrocarbon-generation potential and geochemical characteristics.The results show that these samples belong to good to excellent source rocks,with TOC(total organic carbon) values ranging from 0.5%-8.39%.Source rocks of the Lower Cambrian were better than those of Middle Cambrian.Molecular biomarker indicates a source facies of alleges or aquatic organisms.The strong reducing environment was evidenced by low Pr/Ph and high content of dibenzothiophenes.High content of gammacerane suggests a water-column stratification.Most samples show relative abundance of terpanes and steranes,and the ratios of C21/C23terpanes and C28/(C27+C28+C29)regular steranes were greater than 1.0% and 25%,respectively.The relative higher abundances of C26,C27 triaromatic steroids and triaromatic dinosteroids were also observed.The stable carbon isotopic values were relatively heavy(>-31‰).The geochemical parameters of mudstones from Kalpin Uplift were different from the rest Cambrian source rocks,which indicates a unique source organisms.

Key words: Tarim Basin, Cambrian source rocks, C28 regular steranes, Triaromatic dinosteroids, Carbon isotopic compositions

中图分类号: 

  • TE122.2+3

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