摘要
基于地震、钻井等资料,对南堡凹陷基底先存F4号走滑断裂(简称F4号断裂)活化成因机制及其对油气成藏的控制作用进行研究。综合运用断裂活动期次的厘定、断距回剥和物理模拟等技术手段,明确了F4号断裂在新生代再活动形成的南堡凹陷4号构造带由南向北传播生长,南部以走滑变形为主,北部以伸展变形为主;4号构造带与相邻2号、3号构造带内断裂属于不同断裂体系,是在统一应力场作用下通过“独立生长—相互接触—作用连接”最终交织在一起。通过构建先存断裂再活动变形机制判别图版,认为古近系沙河街组沉积期F4号断裂受走滑作用控制发生再活动,古近系东营组和新近系馆陶组—明化镇组沉积期该断裂受斜向伸展作用控制发生再活动。F4号断裂在新生代再活动对成藏的控制作用包括:①作为油源断裂控制油气垂向跨层运移。②形成走滑转换带控制砂体展布。③向上传播生长并与邻区相互作用控制两类圈闭的形成,有利于油气富集。
Based on seismic and drilling data,the reactivation mechanism of the pre-existing basement F4 strike-slip fault in 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.
作者
刘露
孙永河
陈昌
娄瑞
王琦
LIU Lu;SUN Yonghe;CHEN Chang;LOU Rui;WANG Qi(Earth Science College,Northeast Petroleum University,Daqing 163318,China;Institute of Unconventional Oil and Gas Development,Chongqing University of Science and Technology,Chongqing 401331,China;Chongqing Key Laboratory of Complex Oil&Gas Field Exploration and Development,Chongqing 401331,China;Liaohe Oilfield Company,CNPC,Panjin 124010,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2022年第4期716-727,共12页
Petroleum Exploration and Development
基金
黑龙江省优秀青年人才支持项目(140119002)
中国石油科技创新基金研究项目(2020D-5007-0108)
中国石油“十四五”前瞻性基础性重大科技项目(2021DJ0701)。
关键词
渤海湾盆地
南堡凹陷
新生代
走滑断裂
先存断裂
断裂活化
判别图版
物理模拟实验
油气成藏
Bohai Bay Basin
Nanpu sag
Cenozoic
strike-slip fault
pre-existing fault
fault reactivation
identification template
physical simulation experiment
hydrocarbon accumulation
