Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (2): 265-276.doi: 10.11743/ogg20220202

• Petroleum Geology • Previous Articles     Next Articles

Deformation characteristics and distribution of Tan-Lu fault zone in Liaodong Bay Depression

Chengmin Niu1(), Haifeng Yang1, Tao Guo1, Wei Li2,3(), Zhiping Wu2,3   

  1. 1.Tianjin Technical Department of CNOOC,Tianjin 300459,China
    2.Key Laboratory of Deep Oil and Gas,Qingdao,Shandong 266580,China
    3.School of Geosciences,China University of Petroleum (East China),Qingdao,Shandong 266580,China
  • Received:2020-11-22 Revised:2022-01-21 Online:2022-04-01 Published:2022-03-11
  • Contact: Wei Li E-mail:niuchm@cnooc.com.cn;20070017@upc.edu.cn

Abstract:

Based on the recent 3D seismic interpretation of the Liaodong Bay Depression, we systematically identify the main strike-slip faults, and further discuss the branches and distribution pattern of the Tan-Lu fault zone in the depression in combination with previous research achievements. The results show that there are three (group) branch faults in the Tan-Lu fault zone: the east branch is located in Liaodong area, labeled as No. 1 Liaodong fault; the middle branch is developed in Liaozhong area, including the Cenozoic branches of No.1 and No.2 Liaozhong faults, which have got merged into one major strike-slip fault in the deep layer; the west branch is located in the western slope of Liaoxi area, the Cenozoic Liaoxi strike-slip fault. The three (group) branch faults root in the deep basement and even the Mohorovicic discontinuity, as obviously manifested on the gravity anomaly. There are significant differences in the structural deformation characteristics of the three branch faults in the Liaodong Bay Depression, and they are also significantly different from the Bozhong-Bodong section and Bonan section of the Bohai Sea, mainly resulting from the extent of strike-slip, reactivity of previous faults, thickness and lithology of strata and the property of basement.

Key words: structural characteristics, distribution pattern, gravity anomaly, strike-slip fault, Tan-Lu fault zone, Liaodong Bay Depression

CLC Number: