东营凹陷古近系原油物性及其影响因素

以原油物性资料和地质背景分析为基础，将东营凹陷的原油划分为超重油、重质油、中质油和轻质油4种类型。平面上，相同层系的原油性质呈规律性变化，从生油洼陷中心向边缘呈环带状逐渐变差；复杂断块区的原油性质变化复杂。分析认为，东营凹陷原油物性分布规律是多种因素共同作用的结果，其中油气运移、氧化作用、生物降解以及油源差异等对该区原油性质的环带状分布起主要作用；而油藏保存条件、重力分异作用和油田开发等则是导致东营凹陷局部地区物性变化复杂的主要影响因素。

Physical properties and influence factors of crude oil from Paleogene in Dongying Sag

Based on analysis of the geological setting and physical properties data, crude oil in Dongying Sag can be classified into extra - heavy oil,heavy oil,medium oil and light oil. The regularity change has emerged in oil properties in the same formation on plane and oil properties were gradually poor with zona-ry - like pattern from the sag oil - generating center to the margins; the oil properties were complicated in the faulted block area. The authors believe that the distribution rule of physical properties of crude oil in Dongying Sag is the result of multi - factor combinations; among all the factors, migration, oxidation,biodegradation and oil source differences were the leading events for the zonary - like distribution of oil properties in this area;and the reservoir preservation condition,gravitational differentiation and oil development were the main influencing factors resulting in complex changes of physical properties in some areas of Dongying Sag.