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东非裂谷系Albert湖凹陷新生代构造沉降特征

郑晨宇 赵红岩 邱春光 邹耀遥 王亮 胡滨 贾屾 沈传波

郑晨宇, 赵红岩, 邱春光, 邹耀遥, 王亮, 胡滨, 贾屾, 沈传波. 东非裂谷系Albert湖凹陷新生代构造沉降特征[J]. 地质科技通报, 2021, 40(5): 162-172. doi: 10.19509/j.cnki.dzkq.2021.0513
引用本文: 郑晨宇, 赵红岩, 邱春光, 邹耀遥, 王亮, 胡滨, 贾屾, 沈传波. 东非裂谷系Albert湖凹陷新生代构造沉降特征[J]. 地质科技通报, 2021, 40(5): 162-172. doi: 10.19509/j.cnki.dzkq.2021.0513
Zheng Chenyu, Zhao Hongyan, Qiu Chunguang, Zou Yaoyao, Wang Liang, Hu Bin, Jia Shen, Shen Chuanbo. Cenozoic tectonic subsidence characteristics of Albert Lake Depression in East African Rift System[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 162-172. doi: 10.19509/j.cnki.dzkq.2021.0513
Citation: Zheng Chenyu, Zhao Hongyan, Qiu Chunguang, Zou Yaoyao, Wang Liang, Hu Bin, Jia Shen, Shen Chuanbo. Cenozoic tectonic subsidence characteristics of Albert Lake Depression in East African Rift System[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 162-172. doi: 10.19509/j.cnki.dzkq.2021.0513

东非裂谷系Albert湖凹陷新生代构造沉降特征

doi: 10.19509/j.cnki.dzkq.2021.0513
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:

    郑晨宇(1997-), 男, 现正攻读地质工程专业硕士学位, 主要从事油气勘探地质方面的研究工作。E-mai: 745283265@qq.com

    通讯作者:

    沈传波(1979-), 男, 教授, 博士生导师, 主要从事构造-成藏年代学方面的研究工作。E-mail: cugshen@126.com

  • 中图分类号: P618.4

Cenozoic tectonic subsidence characteristics of Albert Lake Depression in East African Rift System

  • 摘要: 新生代形成的东非裂谷是威尔逊旋回萌芽阶段的典型陆内裂谷,长期以来备受国内外地质学家关注。Albert湖凹陷位于东非裂谷系的西支最北端,整体呈北西向带状展布的不对称(半)地堑。目前,该区已有较好的工业性油气发现,分析其沉降演化规律对进一步揭示该凹陷的构造沉降特征及其油气勘探潜力具有重要的意义。基于钻井资料,结合地震资料解释、沉降史、埋藏史与断层活动性分析,重新划分了构造单元,总结了构造沉降特征,探讨了沉降与断裂的关系、沉降中心迁移的规律及其对油气勘探的指示意义。研究表明:Albert湖凹陷东部的次级构造单元主要受到东部边界断裂的控制,F1、F2断层对东部陡断带、东部断阶带以及三个构造调节带的沉降变化及其形成起主要控制作用;南部次凹在早期沉降速率较大,有利于晚中新世形成巨厚的烃源岩,随着沉降中心向北迁移,北部次凹发育了上中新统和下上新统烃源岩;沉降中心周缘的构造带是油气运聚的有利指向区。研究成果为东非裂谷系Albert湖凹陷油气进一步勘探提供了新的依据。

     

  • 图 1  东非裂谷简要地质图(a)和Albertine裂谷简要地质图(b)(据文献[20]修改)

    Figure 1.  Simplified structural map of the East African Rift (a), regional geological map of the Albertine Rift (b)

    图 2  Albert湖凹陷地层柱状图与纵向剖面图

    Figure 2.  Columnar map and longitudinal section of Albert Lake Depression

    图 3  Albert湖凹陷构造单元划分图与测线虚拟井位置图

    Figure 3.  Albert Lake Depression structural unit division map and survey line virtual well location map

    图 4  Albert湖凹陷结构剖面图(剖面图位置见图 3)

    Figure 4.  Structural profile of the Albert Lake Depression

    图 5  Albert湖凹陷沉降速率平面图

    Figure 5.  Subsidence rate plan of Albert Lake Depression

    图 6  沉降量对比图

    Figure 6.  Comparison of subsidence depth

    图 7  沉降速率图对比图

    a.南部次凹;b.北部次凹

    Figure 7.  Comparison maps of subsidence rate

    图 8  F1、F2断裂活动速率图(断层位置见图 3)

    Figure 8.  Activity rate of F1 and F2 faults

    图 9  Albert湖凹陷埋藏史及生烃史图(Well 32、Well 35位置见图 3)

    Figure 9.  Burial history and hydrocarbon generation history of Albert Lake Depression

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