【摘要】 基于对板桥凹陷钱圈三维工区六个层面断层系统解释的基础之上,分析了钱圈地区Es3、Es2、Es1x、Es1z、Es1s、Ed底界断层平面分布特征,并选取区内垂直于断层的7条地震剖面,对沉积地层进行剥蚀厚度恢复和压实校正后综合运用生长指数、活动速率和古落差三种指标研究断层活动性。研究结果表明:钱圈地区内主要由两组走向为NE和NW近似于垂直的断层组成,且都为正断层,其中沧东断裂为一级断层,大张陀断裂、G39断裂和B60断裂为二级断层,其余为三级断层,倾角大多在55°~70°之间。三种活动性指标揭示了研究区内的主干断层大多为长期活动控沉积断层,断层发育经历了两幕演化,从Es3段至Es1x为第一幕,其中Es2段为活动高峰期;从Es1z到Ed组为第二幕,Es1s段为活动高峰期,而且每一幕都经历由弱到强再弱的变化过程。正是这种断层活动性的差异,使得钱圈地区内沿断裂带发育一系列上超、尖灭和相变等圈闭类型。更多还原

【Abstract】 Based on Faults system interpretation of six layers of the QianQuan three-dimensional work area in BanQiao Depression, Es3, Es2, Es1x, Es1z, Es1s, Ed plane distribution characters in the QianQuan area are analyzed, and seven 3D seismic profiles which are vertical with these faults are studied. After reconstructing denudation thickness of the strata and compaction emendation, faults growth index, fault moving rate and fault older throw are used comprehensively to study,the activity of the faults. The analysis indicates the following: there are NE and NW strike faults which are vertical in the work area and they are all normal faults. The CangDong fault is the first-order fault, DaZhangtuo, G39 and B60 faults are the second-order fault and the rest are third-order fault. The obliquities are almost between 55°and 70°. Analyses of three active indicators of first-order fault and second-order fault in the work area show that the faults have undergone two episodic changes. From Es3 to Es1x is the first episode and Es2 is the active flood tide; from Es1z to Ed is the second episode and Es1s is the active flood tide. Every change is from weak to strong and then to weak again, it is the differences of faults activity that form a series of traps of onlap, pinchout and phase change along the faults boundary.更多还原