南堡凹陷柏各庄断层活动特征及对沉积的控制

在回剥法恢复盆地古沉降速率的基础上, 运用断层活动速率法, 定量分析了南堡凹陷柏各庄断层的活动特征。在盆地演化过程中, 柏各庄断层的活动速率呈现为“弱?强?弱”的变化趋势, 断层南北两部分表现为强弱交替的 “翘翘板”特征。进一步分析表明, 柏各庄断层不同时期和不同部位的差异性活动不仅控制了沉降中心的发育和转移, 而且对砂体分散体系的类型、规模和分布有重要的控制作用。

Activity of Baigezhuang Fault of Nanpu Depression and Its Controlling on Sedimentation

According to the analysis of paleo-subsiding rate recovered by back-stripping method, the activity rate of Baigezhuang fault of Nanpu depression was quantitatively calculated by fault activity rate method. It shows some active characteristics that the fault experienced a “low-high-low”evolutionary trend during the evolution of the Nanpu depression, and a seesaw-like active characteristic between the northern part and the southern part within Baigezhuang fault. The active intensity of the fault definitely varied not only in different evolutional periods of Nanpu depression but in different parts respectively. All this active characteristics have great impact on sediment dispersal and distribution, as well as the location of the subsiding center.