新疆石油地质

新疆石油地质 ›› 2009, Vol. 30 ›› Issue (5): 566-568.

• 油气勘探 • 上一篇    下一篇

柴达木盆地北缘微量元素含量及油气地质意义

曾春林1, 姜波1, 尹成明2, 汪焰华1, 鲍园1   

  1. 1.中国矿业大学 资源与地球科学学院,江苏 徐州 221116;
    2.中国石油 青海油田分公司 勘探开发研究院,甘肃 敦煌 736202
  • 收稿日期:2009-04-07 出版日期:2009-10-01 发布日期:2020-09-30
  • 作者简介:曾春林（1981-）,男,重庆人,博士,石油地质, （Tel）15312641752（E-mail）zengchunlin205@163.com.
  • 基金资助:
    国家油气专项（XQ-2004-01）资助

Trace Element Contents and Their Oil-Gas Geological Significance in Northern Margin of Qaidam Basin

ZENG Chun-lin1, JIANG Bo1, YIN Cheng-ming2, WANG Yan-hua1, BAO Yuan1   

  1. 1.School of Resource and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;
    2.Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China
  • Received:2009-04-07 Online:2009-10-01 Published:2020-09-30

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摘要： 对柴北缘微量元素测试结果表明,Sc、Ti、Cr、Ni、Zn、Cs、La、Tb、Ho、Lu 等元素在半深湖相中的含量明显高于其他沉积环境中的;微量元素同常量元素具有较强的相关性,Cr、Co、Cu、Ni、Cs、La 以及 La 系元素与 Ti、Fe 呈正相关,而与 K、Si、Al 呈负相关;鱼 25 井 Ni/Co 比值平均为 4.22,δCe 值平均为 3.9,均显示该地区中侏罗世为还原环境。微量元素垂向上的变化反映了鱼 25 井中侏罗世经历了 2 个完整的基准面上升-下降的旋回。经测试样品与标样的微量元素对比认为,柴北缘地区的砂岩为基性-中性物源。微量元素对沉积环境分析、找寻烃源岩和油气勘探具有重要意义。

关键词: 柴达木盆地, 北缘, 微量元素, 沉积环境, 油气地质, 意义

Abstract: The testing results of trace elements in the northern margin of Qaidam basin show that contents of Sc, Ti, Cr, Ni, Zn, Cs, La, Tb, Ho, Lu in semi-deep lake facies are obviously higher than those in the other sedimentary settings; the Cr, Co, Cu, Ni, Cs, La and La series elements have positive correlations with Ti and Fe, but negative correlations with K, Si, Al; the Ni/Co ratio (4.22) and δCe value (3.9) from Well Yu-25 indicate that the Middle Jurassic is reducing environment. The vertical changes of the trace elements show that the Middle Jurassic in Well Yu-25 experiences two up-down base level cycles. Based on the comparison of trace elements between test samples and standard samples, the sandstone in the northern margin of Qaidam basin is believed to be basic-neutral provenance. It is suggested that trace element is of great significance in sedimentary environment analysis, searching for source rocks and oil-gas exploration.

Key words: Qaidam basin, trace element, sedimentary environment, oil-gas geology, significance

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