砂岩油藏原始流体饱和度的变化规律

本文根据我国东部油气区直接测定的原始流体饱和度和水银毛管压力曲线等资料综合分析,认识到油藏内流体饱和度的高低,主要取决于地层油水密度差的大小,其变化规律受储层的孔隙结构所控制,并随油藏的油柱高度而变化;在气顶油藏的气顶区除气、水饱和度外,还含有一定数量的束缚油;并指出在应用水银毛管压力资料计算含油饱和度时,必须具有可靠的地层油水密度差、油水界面张力及油柱高度等重要参数.

THE VARIATION OF ORIGINAL FLUID SATUATIONS IN A SANDSTONE RESERVOIR

Original fluid saturation distribution in oil and gas reservoir has been given much attension by the scienticts and engineers engaged in petroleum exploration and development.Based on a comprehensive analysis of the data from the laboratory determined fluid saturation directly from the cores from the wells located in various parts in a reservoir in various petroliferous provinse in East China as well as their capillarity data from mercury injection,this paper demonstrates the regularities on the variation of the original fluid saturation in a petroleum reservoir,analyzes the factors affecting this variation;and discusses the factor to which attensions should be paid in the application of the mercury injection data to evaluate the original fluid saturation of a reservoir.