Fault reactivation in No.4 structural zone and its control on oil and gas accumulation in Nanpu sag,Bohai Bay Basin,China  

作　　者：LIU Lu SUN Yonghe CHEN Chang LOU Rui WANG Qi 

机构地区：[1]Earth Science College,Northeast Petroleum University,Daqing 163318,China [2]Institute of Chongqing Unconventional Oil and Gas Development,Chongqing University of Science and Technology,Chongqing 401331,China [3]Chongqing Key Laboratory of Complex Oil&Gas Field Exploration and Development,Chongqing 401331,China [4]Liaohe Oilfield Company,CNPC,Panjin 124010,China

出　　处：《Petroleum Exploration and Development》2022年第4期824-836,共13页石油勘探与开发（英文版）

基　　金：Supported by the Heilongjiang Outstanding Young Talents Support Project(140119002);Research Project of PetroChina Science and Technology Innovation Fund(2020D-5007-0108);PetroChina"14th Five-Year Plan"Science and Technology Project(2021DJ0701).

摘　　要：Based on seismic and drilling data,the reactivation mechanism of the pre-existing basement F4 strike-slip faultin Nanpu sag and its controlling effect on hydrocarbon accumulation difference are systematically studied.By defining fault activation stages,back-stripping fault throw and physical modeling,it is found that the Nanpu No.4 structural zone formed by the Cenozoic reactivity of the F4 fault grew from south to north,with strike-slip deformation dominated in the south and extensional deformation dominated in the north.Faults in the No.4 structural zone and those in the adjacent No.2 and No.3 structural zones were different fault systems,which grew separately,contacted and connected,and finally interwove under the action of unified stress field.By constructing the identification chart of deformation mechanisms of reactivation of pre-existing faults,it is concluded that during the sedimentary period of the Paleogene Shahejie Formation,F4 fault was reactivated by strike-slip faulting,and during the sedimentary period of Paleogene Dongying Formation and Neogene Guantao-Minghuazhen formations,it was reactivated by oblique extension.The controlling effects of Cenozoic reactivation of F4 fault on hydrocarbon accumulation include:(1)As the oil-source fault,it controlled the vertical cross-layer migration of oil and gas.(2)It gave rise to strike-slip transfer zone to control the distribution of sand bodies.(3)It grew upward and interacted with faults in the neighboring area,controlling the formation of two types of traps,and was favorable for oil and gas accumulation.

关 键 词：Bohai Bay Basin Nanpu sag CENOZOIC strike-slip fault pre-existing fault fault reactivation identification template physical simulation experiment hydrocarbon accumulation 

分 类 号：P618.13[天文地球—矿床学]