天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

寒武系海相碳酸盐岩元素地球化学特征及其油气地质意义——以塔里木盆地柯坪地区肖尔布拉克组为例

汪宗欣1,2,吕修祥1,2,钱文文1,2   

  1. 1.中国石油大学(北京)地球科学学院,北京 102249;
    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:2017-04-24 修回日期:2017-06-09 出版日期:2017-07-10 发布日期:2017-07-10
  • 通讯作者: 吕修祥(1963-),男,湖北钟祥人,教授,博士生导师,主要从事油气藏形成机理与分布规律研究. E-mail:luxx@cup.edu.cn.
  • 作者简介:汪宗欣(1992-),男,湖北黄冈人,硕士研究生,主要从事油气藏形成机理与分布规律研究. E-mail:1322601894@qq.com.
  • 基金资助:

    国家自然科学基金项目(编号:41572100);国家科技重大专项(编号:2017ZX05008-003-010)联合资助.

Geochemical characteristics of the Cambrian marine carbonate elements and its petroleumgeological significance:Case study of Xiaoerbulake Formation in Keping area of Tairm Basin

Wang Zong-xin1,2,Lü Xiu-xiang1,2,Qian Wen-wen1,2   

  1. 1.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resources and Prospection,Beijing 102249,China
  • Received:2017-04-24 Revised:2017-06-09 Online:2017-07-10 Published:2017-07-10

摘要:

通过对塔里木盆地柯坪地区苏盖特布拉克剖面肖尔布拉克组下段40个样品的微量、稀土元素进行测试分析,结合有机碳TOC含量变化,研究表明该地区Ce/Ce*与Eu/Eu*、(Dy/Sm)SN、∑REE均无相关性,反映成岩作用对元素含量影响较小,数据能反映沉积时期真实环境情况。利用Ti元素排除Ba、Cu、Zn元素中陆源影响,得到生源元素校正值Baxs、Cuxs、Znxs及其综合系数Y判断肖尔布拉克组下段纵向上下部古生产力水平高于上部。TOC最大值可达5.14%,平均值为1.96%,总体表现为与古生产力水平相似特征。U/Th、V/(V+Ni)、δU、Ceanom比值判断肖尔布拉克组下段沉积时期处在贫氧_缺氧的环境,后期遭到破坏,印证了早寒武世海侵后海平面下降发生海退的过程。利用Mn/Ti值表征海平面变化,经历了浅且稳定→深且具有波动性→最浅且稳定的变化过程,结合上述判别指标与TOC测量值,说明研究区肖尔布拉克组下段中下部为优质潜在烃源岩。

关键词: 肖尔布拉克组下段, 柯坪地区, 塔里木盆地, 地球化学特征, 古生产力, 古氧相, 有机碳TOC

Abstract:

The Lower Xiaoerbulake Formation in Keping area of Tarim Basin has become a significant sequence for evaluating and superseding.According to the analysis on trace element and REE of 40 samples and the variation of TOC,the results show there is no correlation between Ce/Ce* and Eu/Eu*,(La/Sm)SN,and REE.The diagenesis has little effect on the content of elements,and the data can reflect the real environment in the sedimentary period.Using the Ti element to exclude the terrigenous influence of Ba,Cu and Zn and obtain the corrected values of the biogenic elements,Baxs,Cuxs and Znxs,and their synthesis coefficients,Y.The results show the paleoproductivity level of the lower part in the Lower Xiaoerbulake Formation is higher than the upper in the vertical.The TOC has maximum value,5.14%,mean 1.96%,and is generally similar to that of the characteristics of the paleproductivity level.The U/Th,V/(V+Ni),δU and Ceanom to judge the Xiaoerbulake Formation in hypoxia and anoxic environment during the time of deposition with later destruction confirms the process of regression after Early Cambrian transgression.The sea level variation is characterized by Mi/Ti,which shows the change process of shallow and stable to deep with the volatility and then to the most shallow and stable,and the middle.The lower part of the Lower Xiaoerbulake Formation is a good potential hydrocarbon source rock based on the above indexes and the TOC.

Key words: Lower Xiaoerbulake Formation, Keping area, Tarim Basin, Geochemical characteristics, Paleoproductivity, Paleoredox, TOC

中图分类号: 

  • TE357

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