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扇三角洲体系可发育在断陷盆地演化的不同阶段，但类型有所不同，分为进积型和退积型。松辽东缘断陷盆地中扇三角洲体系不同类型在盆地充填序列中发育位置反映出湖侵—湖退的周期过程。特点是伴随湖侵发育退积型扇三角洲，而伴随湖退发育进积型扇三角洲。扇三角洲类型的特征与发育位置分析可以作为体系域类型的识别标志，并有助于层序过程的理解
Fan delta system can develop in different stages of faulted basin evolution, but the types are different, divided into progressive accumulation and deconvolution. The developmental positions of different types of fan delta system in the filling sequence of the basin in the eastern rift basin of Songliao Basin reflect the cycle process of lake invasion-lake regression. It is characterized by the development of retrograde fan delta accompanied by the lake invasion and the development of progressive fan delta with the retreat of the lake. The characteristics and developmental position of the fan delta can be used as the identification mark of the system domain type and contribute to the understanding of the sequence process