东海盆地B构造新生代断裂特征及形成机制研究

Cenozoic Fault Properties and Development Mechanism in the Structure B of East China Sea Basin

针对东海盆地B构造新生代断裂体系研究较为薄弱的问题,运用构造几何学和运动学方法,利用构造样式刻画和演化恢复等手段,明确B构造断裂体系性质和形成机制。研究结果表明,B构造是典型的正反转构造,其新生代断裂体系分为中深层的早期正断层、逆断层和浅层的晚期走滑断层、扭动断层,这些断层在纵向上相互衔接,促使油气在中浅层聚集成藏。该研究为B构造中浅层油气勘探提供了地质依据。

Structure geometry and kinematics were adopted to investigate the Cenozoic fault systems in the Structure B of East China Sea Basin.The fault system properties and development mechanisms in the Structure B were clarified through structure style characterization and evolution restoration.Result indicates that the Structure B is a typical positive inversion structure.The corresponding Cenozoic fault system is classified into the early normal fault in the medium-deep layers,the reverse fault and shallow late strike-slip fault,and the wrench fault.These faults are connected to each other in the longitudinal direction,which promotes the hydrocarbon accumulation in the medium-shallow layers.This research could provide certain geological basis for the shallow hydrocarbon exploration in the Structure B.