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

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

郑晨宇^{1a, 1b,},
赵红岩²,
邱春光²,
邹耀遥^{1a, 1b},
王亮^{1a, 1b},
胡滨²,
贾屾²,
沈传波^{1a, 1b, ,}

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
计量
- 文章访问数: 1467
- PDF下载量: 328
- 被引次数: 0
出版历程
- 收稿日期: 2021-01-30

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

Zheng Chenyu^{1a, 1b
,},
Zhao Hongyan²,
Qiu Chunguang²,
Zou Yaoyao^{1a, 1b},
Wang Liang^{1a, 1b},
Hu Bin²,
Jia Shen²,
Shen Chuanbo^{1a, 1b
, ,}

摘要

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。
- 东非裂谷 /
- Albert湖凹陷 /
- 沉降史 /
- 成藏 /
- 沉降中心
Abstract: The Cenozoic East African Rift is a typical intracontinental rift at the germination stage of the Wilson cycle, which has long attracted the attention of geologists at home and overseas. The Albert Lake Depression is located at the northern most end of the west branch of the East African Rift System.It is an asymmetric (half) graben with a NW orientation. At present, good industrial oil and gas have been discovered in this area.The analysis of the subsidence evolution is of great significance to further reveal the tectonic subsidence characteristics and petroleum exploration potential of this depression.Based on drilling data, combined with seismic interpretation, and analysis of subsidence history, burial history and fault activities, this paper reclassifies tectonic units, and summarizes the characteristics of tectonic subsidence. The relationship between subsidence and fault activities, the law of subsidence center migration and its indicating significance for petroleum exploration were discussed in this study. The results show that the secondary structural units in the east of the Albert Lake Depression are mainly controlled by the eastern boundary faults, and the F₁ and F₂ faults play a major role in controlling the subsidence and formation of the eastern steep fault belt, the eastern fault terrace zone and the three structural adjustment belts. The subsidence rate of the southern sub sag was large in the early stage, which was conducive to the formation of extremely thick source rocks in Late Miocene.With the northward migration of the subsidence center, the Upper Miocene and Lower Pliocene source rocks were developed in the northern sub sag.The structural belt around the subsidence center is the favorable direction area for hydrocarbon migration and accumulation. This study provides a new basis for further petroleum in Albert Lake Depression of the East African Rift System.
- East African Rift System /
- Albert Lake Depression /
- subsidence history /
- hydrocarbon accumulation /
- sedimentation center

HTML全文

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)

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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

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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

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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

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图 5 Albert湖凹陷沉降速率平面图

Figure 5. Subsidence rate plan of Albert Lake Depression

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图 6 沉降量对比图

Figure 6. Comparison of subsidence depth

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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

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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

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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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