梨树断陷苏家屯地区构造特征及构造演化

Structural Feature and Tectonic Evolution of Sujiatun Area in Lishu Fault Depression

苏家屯洼槽位于梨树断陷西北部,区内断裂极为发育。通过精细构造解释,结合测井、录井数据,对区内断裂展布特征、活动期次、组合样式和构造演化进行分析。结果表明,苏家屯次洼整体上表现为南断北剥、一洼一断阶、南部双断、北部东断西超的特征,在平面上可划分为四个构造单元:西部断阶带、中央凹陷带、东部断阶带、东北构造反转区,通过制作构造演化史剖面,在基于本次三维地震剖面上的构造层特征,以及前人对苏家屯构造演化成果的基础上将研究区构造演化划分为四大阶段:断陷期、断坳转化期、坳陷沉积期和构造反转期。

Sujiatun trough is located in the northwestern part of Lishu fault depression,and the fault is extremely developed.Through the fine structure interpretation,combined with logging data,fault distribution characteristics,activity periods,combination patterns and tectonic evolution in the area were analyzed.The results show that the characteristics of Sujiatun subsag are characterized by southern fault,northern erosion,one groove followed by one step,the southern double-break and the northern east fault while west supercontinent.It can be divided into four structural units on the plane:the western fault zone,the central depression zone,the eastern fault zone and the northeast structural reversal zone.Through making the tectonic evolution history profile,the tectonic evolution of the study area can be divided into four stages based on the tectonic layer features on 3D seismic section and the predecessors on the tectonic evolution of Sujiatun area:fault depression period,fault depression transformation period,depression deposition period and tectonic inversion period.