Abstract: A wide difference of salinity of over 700 times exists in oil field water in eastern China,ranging from fresh to brackish to salty,with apparent ionic differential purification and high concentration of Cl^- and Na⁺. SO₄⁼ increases with increasing salinity,while HCO₃ increases with decreasing salinity. Classified according to salinity, main compounds,character of ionic association and other components,the oil field water in Songliao basin is of the fresh Cl·HCO₃-Na type,in Jiyang depression of the brackish Cl-Na type and in Jianghan basin of the salty Cl·SO₄-Na type.

摘要： 我国东部油田水的含盐量相差700余倍,有淡水、咸水和盐水。离子分异纯化现象比较明显,富集Cl^-和Na⁺。矿化度增高时,SO₄增高;矿化度变低时,HCO₃^-增加。据含盐量,主要化合物,离子组合特征及其它组分,松辽盆地油田水属淡化类Cl·HCO₃-Na型水,济阳拗陷属成化类Cl-Na型水,江汉盆地属盐化类Cl·SO₄-Na型水。