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根据储层建筑结构层次分析原理，把马厂油田的储层细分为九个层次。其中沙三下2厚层主要由水下分支河道砂体、河道间砂体和前缘席状砂体等三种成因砂体组成，以水下分支河道砂体非均质性最强。成因砂体在纵向和平面上的分布控制了储层的平面非均质性，而剩余油的分布决定于储层的层间和平面非均质状况。
According to the principle of reservoir structure analysis, the reservoir in Machang Oilfield is subdivided into nine levels. Among them, the thickness of the second member of Shahejie Formation 2 is mainly composed of three types of distributary sand bodies, such as underwater branch channel sand body, inter-channel sand body and leading edge sand body, with the strongest heterogeneity in the submarine branch channel sand body. The distribution of genetic sand bodies in vertical and horizontal planes controls the plane heterogeneity of reservoirs, while the distribution of remaining oil depends on the inter-layer and planar heterogeneity of reservoirs.