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羌塘盆地南部古油藏带布曲组碳酸盐岩稀土元素特征及意义

万友利 王剑 万方 付修根 王忠伟 沈利军

万友利, 王剑, 万方, 付修根, 王忠伟, 沈利军. 羌塘盆地南部古油藏带布曲组碳酸盐岩稀土元素特征及意义[J]. 石油实验地质, 2017, 39(5): 655-665. doi: 10.11781/sysydz201705655
引用本文: 万友利, 王剑, 万方, 付修根, 王忠伟, 沈利军. 羌塘盆地南部古油藏带布曲组碳酸盐岩稀土元素特征及意义[J]. 石油实验地质, 2017, 39(5): 655-665. doi: 10.11781/sysydz201705655
Wan Youli, Wang Jian, Wan Fang, Fu Xiugen, Wang Zhongwei, Shen Lijun. Characteristics and indications of rare earth elements in carbonates in the Buqu Formation, southern Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 655-665. doi: 10.11781/sysydz201705655
Citation: Wan Youli, Wang Jian, Wan Fang, Fu Xiugen, Wang Zhongwei, Shen Lijun. Characteristics and indications of rare earth elements in carbonates in the Buqu Formation, southern Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 655-665. doi: 10.11781/sysydz201705655

羌塘盆地南部古油藏带布曲组碳酸盐岩稀土元素特征及意义

doi: 10.11781/sysydz201705655
基金项目: 基础性公益性油气地质调查项目(121201010000161110)、国土资源调查项目(1212011221114)和国家“十二五”重大科技专项(2011ZX05004-001)联合资助。
详细信息
    作者简介:

    万友利(1984—),男,博士后,从事储层地质与储层地球化学研究.E-mail:wanyouli@cdut.edu.cn.

    通讯作者:

    王剑(1962—),男,博士,研究员,博士生导师,从事沉积能源地质与大地构造学研究.E-mail:w1962jian@163.com.

  • 中图分类号: TE112.221

Characteristics and indications of rare earth elements in carbonates in the Buqu Formation, southern Qiangtang Basin

  • 摘要: 在羌塘盆地南部古油藏带布曲组碳酸盐岩的详细岩石学分析基础上,研究不同类型碳酸盐岩的稀土元素特征,结果表明:①研究区碳酸盐岩包括灰岩、泥—微晶白云岩、(残余)颗粒白云岩、晶粒白云岩及鞍形白云岩;②各类碳酸盐岩均具有较低的稀土元素总量,能够指示沉积或成岩流体的性质,部分鞍形白云岩样品稀土元素总量高于灰岩,预示着可能有外来流体的加入;③不同类型碳酸盐岩稀土总量具有差别,但经太平洋表层海水标准化后,具有相似的稀土元素配分模式,LaN/YbN平均值为2.86,轻微的轻稀土富集和重稀土亏损,随着白云石化程度的增加,轻稀土富集程度变弱,δCe正异常(平均值2.94)和δEu正异常(平均值1.43),这些特征说明布曲组碳酸盐岩沉积于氧化性质的水体中,白云石化流体主要为同期海源地层水,但在烃类充注以后成岩环境变为还原环境,受早白垩世末期拉萨地体与羌塘地块剪刀式碰撞,研究区布曲组地层中有大气淡水加入,再次受到新生代构造热事件影响,形成鞍形白云岩,构造热事件为Eu2+富集提供温度条件。

     

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  • 收稿日期:  2017-03-20
  • 修回日期:  2017-08-23
  • 刊出日期:  2017-09-28

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