Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (6): 771-780.doi: 10.11743/ogg20130609

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Cenozoic tectonic evolution in the north-central Jizhong Depression

Dong Dawei1, Li Li1, Liu Jian2, Li Jiyan2   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China;
    2. Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China
  • Received:2013-09-23 Revised:2013-10-30 Online:2013-12-08 Published:2014-01-04
  • Contact: 李理(1967- ),女,博士、教授,构造地质学。E-mail:lilywmwys@upc.edu.cn。 E-mail:lilywmwys@upc.edu.cn

Abstract: On the basis of fine seismic interpretation,various methods including fault throw method,fault activity intensity method,balanced cross-section technique and physical simulation are adopted in this paper to analyze the Cenozoic tectonic characteristics and evolution process as well as the forming mechanism of structures.The results show that the north-central part of Jizhong Depression was dominated by extensional structures in the Cenozoic,with strike-slip structure style also occurring.In Baxian Sag,tilting and sliding fault terrace structural styles were predominant.While Raoyang Sag was dominated by anticline structural style except for its northernmost part where strike-slip structure style was common.The extensional intensity shows large diversity in different periods in both Baxian Sag and Raoyang Sag,strictly controlled by the activity of boundary faults.Raoyang Sag was controlled by Liulu,Hejian,and Maxi faults from south to north.The extension of sag as characterized by transition from "south being larger than central-north" in Ek-Es4 to "central-north being larger than south" in Es3-Ed.Baxian Sag was controlled by the diversity of Niudong fault activity along strike,featuring in the tectonic evolution of "strong early stage but weak middle and late stages" in south,"weak early stage strong middle stage and weak late stage"in the central,and "weak early stage but strong middle and late stages" in north.The physics simulation experiment validates the fault development process of research area.The experiment result has strong similarity with the development characteristics of the faults,demonstrating the correctness of tectonic geometry and kinematics characteristic analysis.On the basis of above research,the tectonic evolution process of Raoyang Sag and Baxian Sag is divided into three stages,namely weak early stage,strong middle stage,and fair late stage.Finally,the mechanism and deep background of tectonic formation and evolution are discussed.

Key words: extensional structure, strike-slip structure, physical simulation, Cenozoic tectonic, Jizhong Depression

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