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滨南油田毕家断块扇三角洲分为粗粒突变型（近源型）和细粒渐变型（远源型）两种层序。由第四砂层组到第一砂层组，表现为由浅水到半深水的逐渐演化过程。北部边缘同生断层对第一、二、三砂层组碎屑物质供给起控制作用，第四砂层组则具有多物源供给趋势。储层主要是扇三角洲前缘的各种砂体，其中以河口坝、分支河道最为有利。储层垂向非均质性与沉积演化密切相关，构造活动和湖盆扩展的最弱层段非均质性最强（第四砂层组变异系数２．０２），构造活动和湖盆扩展最强的层段最弱。
Biannan Oilfield Bijia fault block fan delta is divided into coarse-grained mutant (near source) and fine graded (far-source) two kinds of sequences. From the fourth sand group to the first sand group, it shows the gradual evolution from shallow water to semi-deep water. The north margin syntectonic fault plays a controlling role in the detrital material supply of the first, second and third sand layers, while the fourth sand layer has the tendency of multi-material source supply. The reservoirs are mainly all kinds of sand bodies in the fan delta front, among which the estuary dam and the branch channel are the most favorable. The vertical heterogeneity of reservoir is closely related to sedimentary evolution. The weakest interval of tectonic activity and lake expansion is the most heterogeneous (Coefficient of Variation 2.02 in the fourth sand group), tectonic activity and lake expansion The weakest layer is the weakest.