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延长组油田水和地表水因为其矿化度水型的差异,苏林分类时对SO_4~(2-)测定结果的准确度要求也不同。根据《油田水分析方法SY/T5523—2006》推荐的SO_4~(2-)3种测定方法和已废止但仍在使用的EDTA络合滴定法,从经济因素、检测限和检测需求等方面进行了讨论,认为在进行苏林分类时SO_4~(2-)测定方法优先考虑浊度计法。
The water and surface water of Yanchang Formation have different requirements on the accuracy of SO_4 ~ (2-) determination because of their differences in salinities and water types. According to the three SO_4 ~ (2-) methods recommended by the Oilfield Water Analysis Method SY / T5523-2006 and the abolished but still used EDTA complexometric titration, the economic factors, the detection limit and the testing requirements are all taken into account The discussion, that in the classification of Surin SO_4 ~ (2-) determination of turbidimeters priority.