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歧南凹陷生油凹陷控制油气藏平面分布,区域性及局部盖层分布控制油气纵向分布。研究区具有明显的分带性,不同带上有一种或几种主要油气藏类型,由中心至边缘,油藏有序分布。歧南凹陷原油性质随油藏埋深和层位变化。天然气性质以甲烷含量变化最为明显。地层水有三种类型:NaHCO3型,CaCl2、MgCl2。沙一段和沙三段主力生烃层有机质丰度自北向南增高的特征十分明显。烃源岩生烃中心的变化对油气藏的分布有明显的控制作用。
Control of oil depressions in Qiaonan depression controls the distribution of oil and gas reservoirs. The distribution of regional and local caprock controls the vertical distribution of oil and gas. The study area has obvious zonation. Different zones have one or more main types of reservoirs, from the center to the edge and the oil reservoirs are distributed in an orderly manner. The nature of the crude oil in the Qiaonan depression varies with the buried depth and horizon of the reservoir. The nature of natural gas changes most obviously with methane content. There are three types of formation water: NaHCO3 type, CaCl2, MgCl2. The characteristics of organic matter abundance in the main hydrocarbon generation layer of the first and the third member of the Shahejie Formation from north to south are very obvious. The change of hydrocarbon generation center of source rocks has a significant control over the distribution of oil and gas reservoirs.