根据有效介质理论导出了一般水饱和方程,同时还导出了一种较简单的低频方程。两个方程可直接求解水饱和度。模型应适用于任何湿水地区。文中导出专门适用泥质砂岩的其它关系式,但模型必须适用于大量的岩石类型,水传导率以及仪器频率范围。在求导中,方程的矩阵分量中包括了油气,组合“矩阵”元素作为并联中的电阻器。低频方程与各种计算水饱和度的方法相当,例如,Dual—Water,Waxman—Smits Based on the effective medium theory, the general water saturation equation is derived, and a simpler low-frequency equation is also derived. The two equations solve the water saturation directly. The model should be suitable for any wet area. The paper derived other relationships that apply specifically to shaly sands, but the model must be suitable for a wide range of rock types, water conductivities, and instrument frequency ranges. In the derivation, the matrix components of the equation include hydrocarbons and the “matrix” elements are combined as resistors in parallel. Low-frequency equations are comparable to various methods of calculating water saturation, for example, Dual-Water, Waxman-Smits