计算地层水密度的S-K方程

通过对现有地层水密度确定方法的分析对比，结合渤海湾地区已有地层水高压物性分析成果，证实Schowalter诺谟图能客观地反映地层水密度的变化规律；提出影响地层水密度变化的五大因素：地层温度、地层压力、地层水矿化度、气水比及盐与水的质量比；系统建立了求取地层水密度通用方程（简称S-K方程），改变了依靠查图版求地层水密度的传统方法，并为利用压汞资料确定原始含油饱和度奠定了基础。

S-K equations of calculating formatiom water density

Now known methods of determining formation water density have been compared and analysed,density vary property of formation water is approved by Schowalter’s Nomograph and Bohai Gulf area’s PVT analysis data of formation water to determine density of formation water at subsurface conditions.At the same time,put forward five influence factors for density of formation water,they are temperature and pressure and mineralization and GWR and mass concentration of salts.The equations calculating density of formation water have been established,for short S-K equations.It changed the tradition method to determine density of formation water depending on Nomograph,and laid a foundation for S-K equations to determine original oil sateration by mercury injection curve.