郯庐断裂对垦东地区构造和成藏的影响

垦东地区位于郯庐断裂带的渤海段,其形成、演化以及呈现出来的地质特征均受郯庐大断裂控制,进而影响油气成藏。受断裂带影响和控制,垦东地区的断裂整体为NE或NNE走向的雁列式分布的多条断裂。古近纪的伸展运动形成了垦东地区的断陷盆地,沉积了古近系的厚地层,发育了该区最主要的一套烃源岩。受郯庐大断裂的影响,垦东地区可根据构造特征分成三个带:西部主体带、东部斜坡带和北部斜坡带,不同构造带的构造特征差别较大。受区域地质运动的影响,垦东地区部分地层缺失,钻遇的地层主体为:明化镇组、馆陶组、东营组、沙河街组、中生界、古生界。地质特征中,低凸起格局、新近系活跃的构造运动和长期继承性发育的大型披覆构造三个方面影响了油气的富集和成藏。

The Influence of Tancheng-Lujiang Fault Zone to the Tectonization and Stratification of Kendong Area

Kendong area lies in Bohai segment of Tancheng-Lujiang fault zone(TLF). Its form, evolvement, geologic character and hydrocarbon stratification are dominated by TLF. The faults of Kendong area is en echelon fracture taking on NE and NNE. The extensional movement of Paleogene Period formed faulted basin in Kendong area, and developed uppermost source rock. Dominated by TLF,Kendong area can be divided into three zones by structural dissimilarity : the west principal part, the north incline part and the east incline part. Be affected by geologic movement, Kendong area have six stratums: Nm, Ng ,Ed, Es, Mz, Pz. In all geologic characters, low-heave pattern, Neogene structural movement and extended drape structure affect hydrocarbon migration and stratification.