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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。
The Cretaceous steep shoal in the YaXi area developed the fan delta depositional system and provided favorable conditions for the formation of lithologic reservoirs. By analyzing the typical reservoir, it is found that there are two types of lithologic reservoirs in this area, which are distributed in the high and low parts of duck nose nose structure respectively. Comprehensive analysis shows that the formation and distribution of lithologic reservoirs are controlled by tectonic setting, sedimentary facies belt, drainage system and lithology characteristics. Among them, the nose-shaped structure provides the direction of petroleum migration, forming the background of lithologic reservoir formation in this area. The “T-S” type drainage system forms the conditions for the formation of lithologic reservoirs. The developmental positions of different types of channel sand bodies determine the distribution of different lithologic reservoirs and the lithology differences of reservoirs, which determine the degree of enrichment of reservoirs.