鸭西地区白垩系陡岸带发育扇三角洲沉积体系，为岩性油藏的形成提供了良好条件。通过对典型油藏解剖发现，该区岩性油藏包括2 种类型，分别分布在鸭西鼻状构造高部位和低部位。综合分析认为，岩性油藏的形成与分布受构造背景、沉积相带、疏导体系及岩性特征的控制。其中，鼻状构造提供了石油运移的指向，构成该区岩性油藏形成的背景；“T-S”型疏导体系，构成岩性油藏形成的输导条件。不同类型河道砂体的发育部位，决定了不同岩性油藏的分布，储层岩性的差异，决定了油藏的富集程度。

Fan-delta depositional system in Cretaceous developed in steep coast in Yaxi area, which provides a good condition for the forming of lithologic reservoirs. The lithologic reservoirs in the study area include two types，and they distributed respectively in the high position and low position of nose structure in Yaxi area. The forming and distribution of lithologic reservoirs are controlled by the tectonic setting, sedimentary facies belt, transportation systemand lithologic features. The nose structure provides direction for petroleum migration, and constitutes the background for the forming of lithologic reservoirs. The“T- S” transportation system offers transportation conditions for lithologic reservoirs. The development position of different types of channel sand body determines the distribution of different lithologic reservoirs. The differences of reservoir lithology determine the enrichment degree of reservoirs.