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在河湖建造内，砂岩并不是均匀分布的，而是在一些地方相对富集，形成砂岩体。一个发育良好的砂岩体由根部、核部、前缘及两个侧缘组成。砂岩体间被泥质岩或不整合面隔开。松辽盆地泉头组至嫩江组共有21个砂岩体，按成因可以分为四类。各类的区别与成油条件主要取决于前缘带的发育程度，其中以河流三角洲型砂岩体成油条件最好。砂岩体内油气藏发育状况因区而异。前缘带是岩性与混合油气藏主要发育区，在侧缘与根部可以形成地层岩性油藏，而在核部一般只能形成构造油气藏。
Within the lakes and lakes, the sandstone is not evenly distributed, but rather enriched in some places to form sandstone bodies. A well-developed sandstone body consists of a root, a core, a leading edge and two lateral edges. Sandstone body is separated by argillaceous or unconformity. There are 21 sandstone bodies from Quantu-Nenjiang Formation in Songliao Basin, which can be divided into four types according to their genesis. The differences of various types and oil-forming conditions mainly depend on the development degree of the frontal zone. Among them, the river deltaic sandstone body has the best oil-forming conditions. Sandstone oil and gas reservoir body development status varies. The front belt is the main development area of lithologic and mixed reservoirs, and stratigraphic lithologic reservoirs can be formed on the lateral edges and the root, while the tectonic reservoirs can only be formed in the core.