摘要
基于最新三维地震资料分析,结合地质背景、不整合面和古生物化石特征,从同沉积断层发育特征、沉积中心迁移规律两方面对南堡凹陷古近系沙河街组沉积期(断陷阶段)构造幕进行了再划分,并研究了其控藏作用。研究结果表明:①南堡凹陷古近系沙河街组四段(沙四段)主要分布于凹陷东部,沙四段与沙三段、沙三段与沙二段均呈角度不整合接触,沙二段与沙一段为整合接触。②研究区新生代经历了3幕断陷(沙四段沉积期,沙三段沉积期,沙一、二段沉积期)、断拗转换(东营组沉积期)、热拗陷(馆陶组沉积期)、拗断(明化镇组沉积期)6期构造演化阶段,构造应力场由NW—SE转变为近SN向,伸展与走滑构造叠加,形成张扭性变形带,同沉积断层控制的沉积中心表现为SE—NW—SEE迁移规律。③研究区新生代构造演化控制着烃源岩、储层及圈闭的发育,主力烃源岩包括沙四段、沙三段、沙一段及东三段4套,砂体发育模式可分为“转换斜坡”、“转换鼻凸”、“断槽-坡折”3种类型,断-圈交叉发育,纵向上发育3套成藏组合,构成以层状油气藏为主的多层系叠置的复式油气聚集带。老爷庙扇体,高柳断层下降盘及南堡1号、南堡2号、南堡4号坡折带断背斜、断鼻构造圈闭为下一步有利勘探目标。
Based on the analysis of the latest 3D seismic data,combined with the evidence of regional geological background,unconformity surface and paleontological fossils,sedimentary period(fault depression stage)tectonic episodes of Paleogene Shahejie Formation in Nanpu Sag were redivided from two aspects:the development characteristics of synsedimentary faults and migration rule of sedimentary centers,and its control effects on reser voir was studied.The results show that:(1)The fourth member of Paleogene Shahejie Formation(Es4)in Nanpu Sag mainly distribute in the eastern part of the sag.Es3 is angular unconformity contact with underlying Es4 and overlying Es2,and Es1 is integrated contact with Es2.(2)In the study area,Cenozoic experienced six stages of tectonic evolution,such as three episodes of fault depression(Paleogene Es4,Es3,Es1-Es2),faultdepression conversion(Paleogene Ed),thermal depression(Neogene Ng),and depression fault(Neogene Nm).The tectonic stress field rotated clockwise from NW-SE to near SN,and the superimposion of extension and strike-slip structures formed a tensional-torsional deformation zone.The sedimentary center controlled by the synsedimentary fault exhibits the migration law of SE-NW-SEE.(3)Cenozoic tectonic evolution of the study area controls the development of source rocks,reservoirs and traps.Four sets of main source rocks,such as Es4,Es3,Es1 and Ed3 are developed,and development models of sand body can clasified as three types:“conversion slope”“conversion nose-bulge”and“fault trough-slope break”.Faults and traps are across developed,and three sets of accumulation combinations are developed vertically,which constitute a multi-layer superimposed composite oil and gas accumulation zone dominated by layered oil and gas reservoirs.Laoyemiao fan body,Gaoliu fault downthrown wall and Nanpu No.1 fault,Nanpu No.2 fault and Nanpu No.4 slope break belt faulted anticline,fault nose structural trap are prioritized as the next-phase exploration targets.
作者
赵宝银
杨晓利
徐颖新
孟令箭
崔紫瑄
王方鲁
刘剑伦
于福生
ZHAO Baoyin;YANG Xiaoli;XU Yingxin;MENG Lingjian;CUI Zixuan;WANG Fanglu;LIU Jianlun;YU Fusheng(Exploration and Development Research Institute,Jidong Oilfield Company,CNPC,Tangshan 063004,Hebei,China;Jidong Branch of Geological Research Institute of Geology,GRI,BGP lnc.,CNPC,Zhuozhou 072751,Hebei,China;Department of Earth Sciences,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《岩性油气藏》
北大核心
2025年第5期59-69,共11页
Lithologic Reservoirs
基金
国家自然科学基金面上项目“分期异向分层伸展断裂系统叠加过程模拟研究:以渤海湾盆地南堡凹陷为例”(编号:41472116)课题“南堡凹陷二次三维连片处理地震资料解释与区带目标优选”资助。
关键词
构造演化
幕式构造运动
同沉积断层
断背斜
断鼻构造
新生代
南堡凹陷
渤海湾盆地
tectonic evolution
episodic tectonic movement
synsedimentary fault
faulted anticline
fault nose structure
Cenozoic
Nanpu Sag
Bohai Bay Basin
