The fault system of the placanticline in western Dongpu sag is an en echelon fault system consisting of five overlapping faults, relay ramps lie in the overlapping segments.

• 东濮凹陷西部长垣断层系为由5条断层首尾相互叠覆组成的雁列状断层系,断层叠覆段发育转换斜坡。