石油学报 ›› 2019, Vol. 40 ›› Issue (S2): 79-90.DOI: 10.7623/syxb2019S2007

• 地质勘探 • 上一篇    下一篇

辽东湾坳陷新生代构造变形特征及营潍断裂带的表现

康琳1, 吕丁友1, 尚锁贵2, 高京华1, 张江涛1   

  1. 1. 中海石油(中国)有限公司天津分公司渤海石油研究院 天津 300459;
    2. 中海石油(天津)有限公司天津分公司勘探部 天津 300459
  • 收稿日期:2019-10-12 修回日期:2019-12-16 出版日期:2019-12-25 发布日期:2020-04-24
  • 通讯作者: 康琳,男,1988年1月生,2010年获东北石油大学学士学位,2013年获东北石油大学硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院工程师,主要从事地球物理勘探及构造解析研究工作。Email:kanglin2@cnooc.com.cn
  • 作者简介:康琳,男,1988年1月生,2010年获东北石油大学学士学位,2013年获东北石油大学硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院工程师,主要从事地球物理勘探及构造解析研究工作。Email:kanglin2@cnooc.com.cn
  • 基金资助:

    国家科技重大专项课题"近海大中型油气田形成条件与分布"(2011ZX05023-006)资助。

Characteristics of Cenozoic tectonic deformation and performance of Yingwei fault zone in Liaodongwan depression

Kang Lin1, Lü Dingyou1, Shang Suogui2, Gao Jinghua1, Zhang Jiangtao1   

  1. 1. Bohai Oilfield Research Institute, Tianjin Branch, CNOOC China Limited, Tianjin 300459, China;
    2. Exploration department, Tianjin Branch, CNOOC China Limited, Tianjin 300459, China
  • Received:2019-10-12 Revised:2019-12-16 Online:2019-12-25 Published:2020-04-24

摘要:

基于最新的连片三维地震资料和构造制图对辽东湾坳陷断裂系统的构造几何学和运动学特征展开了分析,论证了营潍断裂带在辽东湾坳陷的表现形式。研究表明:1辽东湾坳陷的断裂体系可划分为伸展断裂系统和走滑断裂系统,其中,伸展断裂系统包括NE向、NNE向主干断层及SEE向基底断裂,主要控制了古近系的构造演化及沉积充填,形成辽东湾坳陷"三凹夹两凸"的构造特征,走滑断裂系统主要包括3条NE向切割基底的走滑断层、主干伸展断层之上发育的伸展-走滑型断层以及走滑作用伴生的相关构造,断层在全区分布广泛并向下切割至新近系,使得现今辽东湾坳陷的构造格局更加复杂化;2营潍断裂带在辽东湾坳陷可分为东支断裂带和西支断裂带,共同构成了5个大尺度(凹陷级别)以及多个小尺度(主断裂级别)的走滑双重构造带,成为新生代营潍断裂带的重要构造表现形式;3营潍断裂带的活动可分为始新世的强伸展弱走滑、渐新世的弱伸展强走滑和中新世至今的弱伸展弱走滑3个演化阶段,其中,东支主断裂的伸展位移量和走滑位移量都要明显强于西支主断裂,且活动时间更早,这与辽东湾地区地壳东薄西厚的深部背景有关。

关键词: 断裂系统, 构造变形, 新生代, 营潍断裂带, 辽东湾坳陷

Abstract:

Based on the latest merging 3D seismic data and structural mapping, this paper analyzes the structural geometry and kinematics characteristics of fault system in Liaodongwan depression, and demonstrates the developing pattern of Yingwei fault zone in Liaodongwan depression. The study shows as follows. (1) The fault system of Liaodongwan depression can be divided into extensional fault system and strike-slip fault system. Among them, the extensional fault system includes NE-trending, NNE-trending main faults and SEE-trending basement faults, which mainly control the structural evolution and sedimentary filling in Paleogene, forming the tectonic characteristics of "three depressions sandwiched by two uplifts" in Liaodongwan depression. The strike-slip fault system mainly includes three NE-trending strike-slip faults cutting the basement, and the extensional strike-slip faults developed above the main extensional fault and related structures associated with strike-slip. The faults are widely distributed throughout the whole region and cut down to the Neogene, resulting in a more complicated tectonic framework in Liaodongwan depression. (2) The Yingwei fault zone in the Liaodongwan depression can be divided into the east and west branch fault zones constituting five large-scale (sag levels) and multiple small-scale (main fault levels) strike-slip duplex structural belts, which have become the important tectonic patterns in the Cenozoic Yingwei fault zone. (3) The activities of the Yingwei fault zone can be divided into three evolutionary stages: strong extension and weak strike-slip in Eocene, weak extension and strong strike-slip in Oligocene, as well as weak extension and weak strike-slip since Miocene. The extension and strike-slip displacements of the east branch of the main fault are significantly stronger than those of the western branch of the main fault, and the active time of the former is also earlier, which is related to the deep background of thin crust in the east and thick crust in the west of Liaodongwan area.

Key words: fault system, tectonic deformation, Cenozoic, Yingwei fault zone, Liaodongwan depression

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