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探讨了３种离子构型［Ａ（Ⅰ）Ｂ（Ⅰ），Ａ（Ⅰ）２Ｂ（Ⅱ）和Ａ（Ⅱ）Ｂ（Ⅰ）２型］无机盐溶液的密度计算方法。当温度一定时，上述３种离子构型的无机盐溶液的密度与其盐与水质量比（ｍ）均成简单的线性关系，而且，构型相同的盐，其溶液的密度极为相近（温度、浓度相同）。建立了包含温度ｔ和质量比ｍ变量的盐溶液的密度方程，得出了油气田地层水密度的计算方法。
In this paper, the density of three kinds of ion configurations [A (Ⅰ) B (Ⅰ), A (Ⅰ) 2B (Ⅱ) and A (Ⅱ) B (Ⅰ) When the temperature is constant, the density of the above three kinds of ion-structured inorganic salt solution and its salt to water mass ratio (m) are a simple linear relationship, and, the same configuration of salt, the solution density is very similar (temperature, Same concentration). The density equation of salt solution containing temperature t and mass ratio m variables was established, and the calculation method of formation water density was obtained.