Abstract:

The existing sedimentary model of turbidity fan comes from Walker fan model, which has some deflects without considering such external factors as sea level fluctuation, tectonic setting. Taking Shi115 turbidity fan in midwest area of Dongying depression as example, the control of the factors to the development of turbidity fan, which are tectonic movement, sea level fluctuation, sediments supply and pale geomorphology is analyzed. Research shows that tectonic movement and lacustrine level fluctuation control the formation of sedimentary space, and the sediments supply results in the decrease of sedimentary space, so as to control the development of turbidity fan. The distribution of turbidity fan is severely impacted by pale geomorphology existed in the time of sedimentation, the integration of the factors controls the formation and distribution of turbidity fan.

Key words: turbidity fan, fan model, tectonic setting, lacustrine fluctuation, sediments supply, rift basin