摘要
摘要：断裂是渤海海域油气成藏的主控因素之一，利用地震剖面解释和构造编图成果，对渤海海域新生代断裂发育特征及形成机制进行了分析。渤海海域主要发育伸展断裂和走滑断裂，局部地区发育反转断裂。在平面上主要呈NE，NW和近EW向展布，其中NE向断裂多属于郯庐走滑断裂带的组成部分，在剖面上表现出花状构造特征。NW向断裂主要与张家口－蓬莱走滑断裂带有关，并与NE向断裂发生了相互剪切作用，共同构成了渤海地区新构造期的共轭剪切破裂系统。近EW向断裂可分为两类：大型近EW向断裂带多构成南部地区凸起和凹陷的分界断裂，经历了早期伸展和晚期走滑作用的叠加，在剖面上多表现为铲式主干正断层和浅层走滑分支断层相组合的似花状特征；浅层密集发育的小型近EW向断裂多是受郯庐断裂带走滑作用影响而形成的派生断裂。
Abstract
Abstract: Fault is one of the major factors that control hydrocarbon accumulation in the Bohai Sea waters. Based on seismic interpretation and structural mapping, this paper focuses on the characteristics and formation mechanisms of the Cenozoic faults in the Bohai Sea waters. In the study area, extensional and strikeslipping faults are the most predominant, and inverted faults are locally distributed. On plane view, most of the faults are of NE, NW or EWtrend, and the NEtrending faults mostly belong to the Tanlu strikeslip faut zone. While on sectional view, the faults occur as flower structures. The NWtrending faults are associated with the ZhangjiakouPenglai strikeslip fault zone, and constitute a conjugate shear faults system with the NEtrending faults during the neotectonic stage. The near EWtrending faults can be classified into two types according to their scale. The largescale EWtrending faults, acting as the boundary faults between the salient and trough in the southern part, experienced the early extensional and late strikeslipping movements. They exhibit quasiflower structures composed of major listric faults and shallow branching strikeslipping faults on the section. The smallscale EWtrending faults are densely developed in the shallow strata, and they are mostly derivative faults resulted from the strikeslipping movement of the Tanlu fault zone.
论文详情