地学前缘 ›› 2022, Vol. 29 ›› Issue (6): 305-313.DOI: 10.13745/j.esf.sf.2022.8.11

• 原型盆地复原理论与方法 • 上一篇    下一篇

鄂尔多斯盆地南缘寒武纪同沉积伸展断裂系统及其成因机制分析

熊伟东1,2(), 肖安成1,2,*(), 魏国齐3, 吴磊1,2, 张春林3, 王依平1,2, 杨流昀1,2, 王芊芊4   

  1. 1.浙江大学 地球科学学院, 浙江 杭州 310027
    2.教育部含油气盆地构造研究中心, 浙江 杭州 310027
    3.中国石油勘探开发研究院, 河北 廊坊 065007
    4.浙江大学医学院, 浙江 杭州 310027
  • 收稿日期:2022-07-07 修回日期:2022-07-27 出版日期:2022-11-25 发布日期:2022-10-20
  • 通讯作者: 肖安成
  • 作者简介:熊伟东(1994—),男,硕士研究生,构造地质学专业。E-mail: xiongwd94@163.com
  • 基金资助:
    国家“十三五”重大专项(2017ZX05008001);国家“十三五”重大专项(2016ZX05003001);国家“十三五”重大专项(2017ZX05008005);国家重点研发计划项目(2016YFC0601002)

Characteristics of a Cambrian normal fault system in the Southern Ordos Basin and its formation mechanism

XIONG Weidong1,2(), XIAO Ancheng1,2,*(), WEI Guoqi3, WU Lei1,2, ZHANG Chunlin3, WANG Yiping1,2, YANG Liuyun1,2, WANG Qianqian4   

  1. 1. Department of Earth Science, Zhejiang University, Hangzhou 310027, China
    2. Research Center for Structures in Oil & Gas Bearing Basin, Ministry of Education, Hangzhou 310027, China
    3. PetroChina Research Institute of Petroleum Exploration and Development, Langfang 065007, China
    4. Zhejiang University School of Medicine, Hangzhou 310027, China
  • Received:2022-07-07 Revised:2022-07-27 Online:2022-11-25 Published:2022-10-20
  • Contact: XIAO Ancheng

摘要:

由于复杂的构造叠加及严重的覆盖,人们对鄂尔多斯盆地早古生代深部结构的研究仍很薄弱。本文主要通过地震数据处理和解释,结合野外地质调查,发现在寒武纪时期,盆地的南缘发育了一套北东向和近东西向的正断裂系统。作者对这套断裂系统的平面及剖面特征进行了详细的描述和分析,并结合区域地质背景探讨了其成因机制,结果表明该套断裂系统主要是由于先存的元古宙北东向基底断层在寒武纪时期发生了继承性活动而形成,同时在断裂系统的局部区段派生出了东西向展布的小规模新生断层。这套断裂系统的发现可能对鄂尔多斯盆地南缘在寒武纪的演化认识及油气勘探具有一定的启示意义。

关键词: 鄂尔多斯盆地, 寒武纪, 断裂系统, 继承性

Abstract:

The Early Paleozoic deep structures of the Ordos Basin are not well studied due to the complex tectonic superposition and great difficulty accessing the deep strata. Based on seismic data interpretation and field geological survey, we found a Cambrian normal fault system in the southern Ordos Basin made of a set of NE and nearly EW faults. Here, we present a detailed description and analysis of the plane and profile characteristics of this fault system, and combined with regional geological background,discuss the genesis of the fault system. Our results indicate that this fault system is formed by the inherited activities of preexisting Proterozoic NE-trending basement faults in the Cambrian. Meanwhile, small-scale EW-trending newly-generated faults are formed in some segments of the fault system. The discovery of this fault system may be of significance for understanding the evolution of the southern Ordos Basin in the Cambrian as well as for the regional hydrocarbon exploration.

Key words: Ordos Basin, Cambrian, fault system, inherited

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