The lower assemblage consists of several source beds such as lake and transitional facies of the Eocene Series and Yacheng Formation; the reservoirs are mainly fan delta,sand beach,sand bars,foreset wedges and slope fans.

• 在本区的上、下两个生储盖组合中 ,下层生储盖组合有多个烃源层 ,始新统、崖城组湖相和海陆过渡相及各层序密集段皆为主要烃源岩 ,储集层主要由扇三角洲、砂滩、砂坝、前积楔和斜坡扇等组成 ;