doi:10.16186/j.cnki.1673-9787.2019100044

Received:2019/10/15

Revised:2019/12/11

Published:2021/01/15

Tectonic deformation characteristics and fault system division ofBanqiao slope in Qikou sag

CHEN Yan1,2, LIU Haitao2, ZHAO Changyi1,2, JIANG Wenya3, WANG Shunyu4, LI Chuanming1,2

1.College of Geoscience and Surveying Engineering,China University of Mining & Technology （ Beijing ） ,Beijing  100083 ,China;2.PetroChina Research Institute ofPetroleum Exploration & Development,Beijing  100083 ,China;3.PetroChina Dagang Oilfield Company,Tianjin  300280 ,China;4.School of Earth Science,Northeast Petroleum University，Daqing  163318 ,Heilongjiang,China

Abstract:Banqiao slope is the secondary tectonic unit of the Cenozoic Qikou sag in the Bohai Bay basin. In order to explore the structural geological characteristics of the Banqiao slope and its role in hydrocarbon accumulation ，based on the previous research results and the latest 5 280 m2 3D seismic data of Qikou sag,by using fault strike rose diagram,buried depth fault distance curve,fault activity rate curve,growth index curve and fault distance curve,the structural analysis was carried out,the characteristics such as formation period,nucleation time,activity and segmentation growth of Dazhangtuo-faults were determined. Based on the balanced profile technique,u structural stripping“ was carried out,the development and evolution history of different locations in the slope area was made,and structural recovery analysis was carried out. The fault zone was systematically di vided into six sets according to the temporal characteristics of fault activity,namely the rifting episode I fault （type I） ,the rifting episode II fault （type II） ,the post-rifting fault （ type 田），Shahejie formation-Dongying formation fault （type I-I） ，Es1 Dongying formation-Guantao formation and Minghuazhen formation fault type I-田），Shahejie formation-Dongying formation-Guantao formation-Minghuazhen formation fault （ type I-I-田）.

Key words:Qikou sag;Banqiao slope;Dazhangtuo-fault;tectonic evolution history;fault  system division

 歧口凹陷板桥斜坡构造变形特征及断裂系统划分_陈彦.pdf