摘要
为厘清南堡凹陷新生代盆地结构与构造演化过程,以地震资料及解释成果为基础,运用油区构造解析原理对盆地断裂构造及演化进行深入研究。得到以下认识,南堡凹陷发育基底和盖层深浅两套断裂系统;凹陷垂向结构具有下部箕状单断结构和上部地堑双断式的复式断陷结构特征;平面由西向东由铲式单断型盆地过渡为地堑双断型盆地。构造演化具有强-弱交替的幕式断陷特征,分为始新世NW-SE向伸展的箕状断陷期,渐新世近SN向伸展的地堑式断陷期,新近纪拗断-沉降期。
To clarify Cenozoic basin structure and tectonic evolution characteristics of Nanpu Sag,based on seismic data and its interpretation,this paper carries out an in-depth study on the fault structure and evolution of the basin with the structural analysis principle of the oil zone.Results show that two sets of fault systems,base and caprock;the vertical structure of the sag has the characteristics of a lower half-graben single-fracture structure and an upper graben double-fracture;horizontally from the west to the east,the shove-shape single-fracture basin transitions into the graben double-fracture basin.The tectonic evolution is characterized by of episodic rifting with strong-weak alternating faulted-rifting.It can be divided into three stages,Eocene half-graben faulted-rifting stage with NW-SE extension,Oligocene graben faulted-rifting stage with almost SN extension,and Neogene depression.-subsidence stage.
作者
陈玮常
闫晶晶
Chen Wei-chang;Yan Jing-jing(Jining Normal University,Ulanqab 012000,Inner Mongolia)
出处
《集宁师范学院学报》
2020年第3期115-118,F0003,共5页
Journal of Jining Normal University
基金
内蒙古自治区高等学校科学技术研究项目“基于断层活动性因子的伸展断陷盆地变换带识别与分类研究”(项目编号:NJZY20247)。
关键词
断裂系统
幕式断陷
构造演化
南堡凹陷
Fault system
episodic rifting
tectonic evolution
Nanpu Sag
