板桥斜坡第三纪构造几何学分析

Tertiary structural geometry analysis of Banqiao slope

为查明歧口凹陷板桥斜坡区构造地质特征,以板桥斜坡工区3D地震资料为基础,选取新生代时期具有代表性的半地堑、地堑以及叠瓦状铲式正断层构造带,利用油区构造解析和3D MAX常规建模分析的方法,对研究区伸展断陷盆地构造地质的几何学、运动学特征进行精细解析。结果表明,板桥斜坡内断层的继承性发育特点较为显著,由此派生出大量次级断层,受控于幕式岩石圈整体拉张作用影响,该区在经历裂陷Ⅰ幕和裂陷Ⅱ幕2个沉降阶段形成了3种构造样式。自南西向北东可以划分:由沧东断裂控制的凹陷形成半地堑构造带;沧东断裂和板桥、大张坨断裂共同控制形成的地堑构造带;由沧东断裂和大量次生同向断层所控制的叠瓦状铲式正断层构造带。

In order to find out the structural geological characteristics of Banqiao slope in Qikou sag,based on the 3D seismic data of the Banqiao slope,the representative half graben,graben and imbricate gliding of the listric positive fault tectonic belt in the Cenozoic era were selected,and the geometric and kinematic characteristics of the tectonic geology in the extensional fault basin of the study area were carefully analyzed by using the method of structural analysis and 3D MAX conventional modeling analysis in the oil area.The results showed that the succession development characteristics of the internal faults in the slope of the plate bridge were more remarkable,and a large number of secondary faults were derived,which were controlled by the overall tension of the episodic lithosphere,and three tectonic styles had been formed in the two sedimentation stages of the rifting actⅠand actⅡof the rifting stage.From the south west to the North East can be divided:the sag controlled by the Cangdong fault formed a half graben tectonic belt,the Cangdong fault,Banqiao fault and the Dazhangtuo fault jointly controlled the graben tectonic belt,a shingled,shovel-type normal fault belt controlled by the same fault.