三塘湖盆地原油物性特征及其影响因素

在对三塘湖盆地不同层位原油物性分布特征研究的基础上，结合地质条件，分析了影响原油物性特征的各种因素。原油物性不仅受原油族组成的影响，而且也受成熟度、埋藏深度、保存条件、组分重力分异作用等的影响。相对密度的影响因素较多，主要包括饱和烃、芳香烃、胶质含量、沥青质和含蜡量等，粘度主要受饱和烃、芳香烃、胶质含量的影响，沥青质和含蜡量对其影响不大。牛圈湖油田芦草沟组原油物性变化不同于其它地区和其它层位，其随深度增加而升高，主要是油气藏中烃类重力分异作用的结果。其它地区原油物性随深度增加而降低的特征主要与保存条件、水洗作用、氧化作用等因素有关。该认识对于其它地区原油物性分布特征的研究具有重要的参考价值。

THE PHYSICAL PROPERTIES AND THE INFLUENTIAL FACTORS OF THE CRUDE OIL IN SANTANGHU BASIN

Based on the research on physical properties and the distribution characteristics of crude oil in Santanghu basin, combining the geological condition, the authors analyze the influencial factors of the physical properties of crude oil. It is shown that physical characteristics of crude oil depend not only on group compositions, but also on maturity, burial depth, preservation condition and compositional gravity differentiation. The factors of influence on density include content of saturation hydrocarbon, arocomatic hydrocarbon, resin, asphaltene and wax. Viscosity mainly depends on content of saturation hydrocarbon, arocomatic hydrocarbon and resin, not on asphltene and wax. For the change of physical properties of the crude oil in Lucaogou Formation, Niujuanhu oil field, the bigger its depth is, the higher its viscosity, which are different from other area and stratum, and it is the result of gravity differentiation of different hydrocarbons. The physical properties variation of crude oil in other area decrease as its depth increasing, mainly related to preservation condition, water leaching and oxidation, the recognition is of an importance to other areas in the research on physical property distribution characyeristics of crude oil.