西南石油大学学报(自然科学版)

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Cenozoic Tectonic Characteristics and Evolution in Changdi Area
of Jiyang Depression

Li Xuemei, Wang Wei, Wang Pingping, Fan Jiulin, Liu Chaofei   

  1. College of Geoscience and Surveying Engineering,China University of Mining & Technology(Beijing),Haidian,Beijing 100083,China
  • Online:2014-10-01 Published:2014-10-01

Abstract:

The main fault and its associated structures in Changdi Area of the Bohai Basin are studied according to its 3D
seismic data,drilling wells by using balanced section technique. The result shows that a variety of scales,shape and properties
of the fault are developed in Changdi Area,the majority of which belong to growth fault. Fault activity has the characteristics
of episodic by the influences of the Jiyang Movement and the Dongying Movement. The larger two unconformity interfaces are
closely related to the fracture episodic activities in Changdi Area. The multi-phase unconformity interface reflects the tectonic
evolution of the experience of polycyclic depression in the Cenozoic. According to the analysis of the major balanced cross
section and identification of the important interface,and combined with regional subsidence history,the tectonic evolution of
the Changdi Area can be divided into three stages:fold formation stage,fault depression stage and stable settlement stage.
Fault depression stage can be further divided into episode I in Eocene(E2 s3—E2 s2)and episode II in Oligocene(E3 s1—E3d).
Hydrocarbon trap are mainly controlled by fault activities,and meanwhile under the influence of its tectonic evolution.

Key words: Changdi Fault, Changdi buried hill, fault characteristics, episodic activities, tectonic evolution