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依托最新采集的5 280km2二次三维地震数据解释成果,对歧口凹陷的伸展断裂系开展系统分析。研究认为歧口凹陷内一级、二级主要伸展断裂滚动演化特征在一定程度上是整个盆地断裂演化特征的缩影,故重点分析了沧东断裂、滨海断裂等的演化特征。歧口凹陷新生代主要伸展断裂的活动表现出分段性、迁移性、旋回性和长期性四大特点。横向上具有由SW向向NE向滚动演化的特征,体现了断裂活动的分段性和迁移性特点;在纵向上断裂的活动可分为4幕,即沙三中期、沙一中期、东营末期及明化镇末期,沙一期、东营期是断裂主要活动期,体现了断裂活动的旋回性和长期性特点。
Relying on the latest results of interpretation of 5 280 km2 secondary 3D seismic data, a systematic analysis of extensional fault systems in the Qikou Depression was performed. The study shows that the rolling evolution characteristics of the primary and secondary extensional faults within the Qikou sag are a microcosm of the evolution of fracture characteristics in the whole basin. Therefore, the evolution characteristics of the Cangdong fault and the coastal fault are mainly analyzed. The activities of the main extensional faults of the Cenozoic in the Qikou Sag show four characteristics: segmentality, migration, cycle and long-term. Laterally with the evolution from SW to NE rolling characteristics, reflecting the fragmentation and mobility of the characteristics of the fault; in the vertical direction of the fault can be divided into four activities, namely, the middle of the sand third, middle of the sand, the end of Dongying And the end of Minghua Town, the first phase of Shahejie and Dongying phases are the main active periods of faults, which reflect the cyclical and long-term characteristics of fault activities.