渤海辽东湾坳陷走滑断裂差异变形特征

走滑断裂是渤海辽东湾坳陷内的一类重要断裂，属于郯庐断裂带的组成部分，对辽东湾坳陷的地质结构和油气成藏都产生了重要影响。通过三维地震资料精细解释，揭示了辽东湾坳陷走滑断裂带的空间展布和分段差异变形特征。走滑断裂主要分布在辽东和辽中地区，总体呈北东走向，连续性较好，在剖面上发育花状构造，在平面上发育走滑双重构造和伸展叠瓦扇构造。通过对比不同地区走滑断裂带的变形特点，可以发现走滑断裂带具有明显的分段差异变形特征。总体上，可将辽东和辽中地区的走滑断裂带划分为南部的压扭段和北部的凸起段两大段，而且凸起段还可进一步根据凸起发育特征细分为复合凸起段、隐伏凸起段和单一凸起段。辽东凸起的形成主要受走滑断裂带的压扭性活动影响，而辽西凸起的形成主要是受地幔上隆导致的伸展作用控制，开始隆升的时间也早于辽东凸起。

Differential deformation of strike slip faults in the Liaodongwan Depression,offshore Bohai Bay Basin

As an important fault type in the Liaodongwan Depression,strike slip faults are components of the Tan-Lu fault zone,and they have exerted major influences on the structural framework and hydrocarbon accumulation in the depression.Based on detailed 3D seismic interpretation,this paper reveals the spatial distribution and segmented differential deformation characteristics of the strike slip faults in the Liaodongwan Depression.The strike slip faults mainly occur in the eastern and central Liaodongwan Depression,trend northeast as a whole,and have good continuity.They appear as flower structures on sectional view,while appear as strike slip duplex and imbricated structures on plane view.Comparison of deformation features of strike slip faults in different areas shows that the strike slip fault zone features in obvious segmented differential deformation.The strike slip faults can be divided into two segments,namely transpressional segment in the south and uplifting segment in the north.The uplifting segment can be subdivided into complex-uplifting,buried-uplifting and single-uplifting segments according to the shapes of the uplift.The development of the Liaodong uplift was mainly controlled by the transpressional movement of the strike slip faults,but the Liaoxi uplift with earlier initiation of uplifting was influenced by extensional stresses resulted from mantle uplifting.