The sedimentary cycle in the middle and upper Eocene of Dongying basin is distinguished into five subsequences (DSI -DS5), six types of depositional systems and eleven factes, and divided into three evolution periods from bottom to top.

• 东营盆地中，上始新统沉积旋回可划分出五个亚层序（DS1－DS5），六种沉积体系和十一种相带，从下向上按三个发育阶段演化。