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东非裂谷Albertine盆地上中新统—下上新统烃源岩地球化学特征与沉积环境

王珩 赵红岩 苏鹏 邱春光 宋宇 杨宇航 沈传波 胡守志

王珩, 赵红岩, 苏鹏, 邱春光, 宋宇, 杨宇航, 沈传波, 胡守志. 东非裂谷Albertine盆地上中新统—下上新统烃源岩地球化学特征与沉积环境[J]. 地质科技通报, 2022, 41(4): 91-99. doi: 10.19509/j.cnki.dzkq.2022.0122
引用本文: 王珩, 赵红岩, 苏鹏, 邱春光, 宋宇, 杨宇航, 沈传波, 胡守志. 东非裂谷Albertine盆地上中新统—下上新统烃源岩地球化学特征与沉积环境[J]. 地质科技通报, 2022, 41(4): 91-99. doi: 10.19509/j.cnki.dzkq.2022.0122
Wang Heng, Zhao Hongyan, Su Peng, Qiu Chunguang, Song Yu, Yang Yuhang, Shen Chuanbo, Hu Shouzhi. Geochemical characteristics and sedimentary environment of upper Miocene-lower Pliocene source rocks in the Albertine Basin, East African Rift Valley[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 91-99. doi: 10.19509/j.cnki.dzkq.2022.0122
Citation: Wang Heng, Zhao Hongyan, Su Peng, Qiu Chunguang, Song Yu, Yang Yuhang, Shen Chuanbo, Hu Shouzhi. Geochemical characteristics and sedimentary environment of upper Miocene-lower Pliocene source rocks in the Albertine Basin, East African Rift Valley[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 91-99. doi: 10.19509/j.cnki.dzkq.2022.0122

东非裂谷Albertine盆地上中新统—下上新统烃源岩地球化学特征与沉积环境

doi: 10.19509/j.cnki.dzkq.2022.0122
基金项目: 

"十三五"国家科技重大专项子课题 2017ZX05032-002-004

详细信息
    作者简介:

    王珩(1997-), 男, 现正攻读地质工程专业硕士学位, 主要从事油气地球化学相关研究。E-mail: 2857962176@qq.com

    通讯作者:

    胡守志(1976-), 女, 副教授, 主要从事油气地球化学教学与科研工作。E-mail: hushzh@cug.edu.cn

  • 中图分类号: P618.13

Geochemical characteristics and sedimentary environment of upper Miocene-lower Pliocene source rocks in the Albertine Basin, East African Rift Valley

  • 摘要:

    Albertine盆地是东非裂谷系重要的裂谷盆地, 油气资源丰富, 上中新统-下上新统烃源岩是盆地重要的生烃岩系, 目前研究相对薄弱。综合利用地质学、岩石热解、元素地球化学等资料, 对Albertine盆地上中新统和下上新统的烃源岩进行了评价, 并分析了晚中新世-早上新世时期的古环境特征。研究表明, 两套烃源岩处于成熟阶段, 但有机质丰度和类型存在差异, 下上新统烃源岩有机质丰度更高, 属于中等-好烃源岩, 干酪根类型主要是Ⅱ1~Ⅱ2型; 上中新统烃源岩有机质丰度略低, 属于差烃源岩, 干酪根主要是Ⅱ2~Ⅲ型。沉积环境是造成烃源岩差异的重要原因。晚中新世-早上新世时期, 研究区属于还原性较强的淡水湖盆, 水体逐渐加深, 气候越来越温暖, 细菌及微生物繁盛, 有机质类型变好, 同时, 湖泊生产力提高, 沉积速率有所加快, 有机质能够更有效地保存, 烃源岩的有机质丰度更高。研究结果对于Albertine盆地的油气勘探与开发具有重要的理论意义和实际意义。

     

  • 图 1  Albertine盆地构造区划及区域位置图

    Figure 1.  Tectonic division and location of the Albertine Basin

    图 2  Albertine盆地地层柱状图

    Figure 2.  Stratigraphic column of the Albertine Basin

    图 3  Albertine盆地烃源岩TOC与S1+S2关系图

    Figure 3.  Correlation between TOC and S1+S2 of source rocks in the Albertine Basin

    图 4  Albertine盆地有机质类型判别图

    Figure 4.  Discrimination map of organic matter types in the Albertine Basin

    图 5  V/Cr-V/(V+Ni)交汇图

    Figure 5.  Cross plot between V/Cr and V/(V+Ni)

    图 6  相当硼校正曲线

    Figure 6.  Correction chart of equivalent boron

    图 7  Sr/Ba-相当硼质量分数交汇图

    Figure 7.  Cross plot between Sr/Ba and equivalent boron

    图 8  Albertine盆地下上新统烃源岩稀土元素配分模式(北美页岩标准值据文献[44])

    Figure 8.  NASC-normalized REE patterns of the Lower Pliocene source rocks in the Albertine Basin

    图 9  Albertine盆地上中新统烃源岩稀土元素配分模式(北美页岩标准值据文献[44])

    Figure 9.  NASC-normalized REE patterns of the upper Miocene source rock in the Albertine Basin

    图 10  LaN/YbN箱状图

    Figure 10.  Box charts of LaN/YbN

    表  1  烃源岩成熟度与Tmax关系[15]

    Table  1.   Table of relation between maturity and Tmax of source rocks  Tmax/℃

    油气形成阶段 生油 凝析油 湿气 干气
    Ⅰ类干酪根 437~460 450~465 460~490 > 490
    Ⅱ类干酪根 435~455 447~460 455~490 > 490
    Ⅲ类干酪根 432~460 445~470 460~505 > 490
    下载: 导出CSV
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  • 收稿日期:  2021-04-22
  • 网络出版日期:  2022-09-07

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