摘要
Sedimentary characteristics and depositional model of Dongying Formation in depressed belt of eastern Nanpu Depression were studied based on core,grain size and logging data. Interpretation results showed that the gravity flows’ sediments included fine sandstone and siltstone with an average thickness of 2.94 m and a maximum thickness of 9.5 m for a single bed. Among them, there were 22 single sandstone beds with over 3 m thickness, which had a total thickness of 107.5 m. Basically, the sediment gravity flows were sprung by sediments’ slump on the delta front slope in studied area. During the processes, earthquake movements and intermittent volcano eruptions, besides natural sediments slump when the angle of delta front slope overrun the critical slope angel, brought the key dynamical mechanisms.