Kongdian Formation and the fourth member of Shahejie Formation are important oil-gas-0bearing formations in Huimin-Dongying Depression.Their tectonie evolution can be divided into four stages

e. i. the filling of extensional Half-graben

strong fault-block movement

the complication of fault-block movemenmt and deep buried stages.Accordingly

the fault evolution series is plate→listic→Ramp and flat patterns in Kongdian Formation and the fourth Member of Shahejie Formation. The evolution series of Huimin-Dongying Depression was the rotational half-graben→Rolling half-graben→complex half-graben. The fourth member of Shahejie Formation was favourable source rock due to The effect of teotonic movement

Kondian Formation and the fourth member of Shahejie Formation developed into two Sets of normal source-reservoir-cap rock assemblage. The faults in the basin are the main migration paths

and the main Traps are fault-blacks and fault-noses. The uplifts in the depression and marginal slopes are the most favourable sites for oil-gas accumulation.