新生代郯庐断裂活动在莱州湾地区的响应

摘要

By using the latest 3D seismic data, we described the space distribution of the Tan-Lu fault in the southern Bohai area and analyzed the evolution history and the influence to sedimentation and tarp formation com-bining the previous research achievements. The results showed that:in the southern Bohai area, flower structure and formation dag were revealed in the Tan-Lu fault and the salt activity was also a strong evidence for the strik-slip movement of the Tan-Lu fault in Cenozoic. The activity of the Tan-Lu fault had a significant impact on the evolution of the Laizhou Bay Sag, mainly reflected by the migration of sedimentary center. It also led to the for-mation of traps in both deep and shallow layers and most of the traps were faulted anticlines and fault blocks.%　　运用最新的三维地震资料，对渤海南部海域郯庐断裂的空间展布特征进行了刻画，综合分析了郯庐断裂在研究区内活动演化史及其对该区域内沉积和圈闭的影响。郯庐断裂在研究区渤海南部海域内表现出了明显的花状构造和地层拖曳现象，东支断裂南部的盐构造南北向展布也证实了郯庐断裂新生代以来确实发生过走滑活动；郯庐断裂的活动演化对莱州湾凹陷产生了重要影响，主要体现在渐新世的走滑活动导致了莱州湾凹陷沉积中心向凹陷东北方向发生了偏移，并在深浅层形成了以断背斜、半背斜和断块为主的圈闭。