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氯元素有两个稳定同位素；３５Ｃｌ（７５．７７％）和３７Ｃｌ（２４．２３％）。过去一直认为稳定氯同位素的比值（３７Ｃｌ／３５Ｃｌ）几乎不变。８０年代以来利用高精度质谱法成功地发现了自然界氯同位素分馏作用。各地不同深度海水的氯同位素组成极为一致，故以标准平均海水氯（ＳＭＯＣ）作为对比标准。河北沧州和山东烟台地区地下淡水和热水的δ３７Ｃｌ为－１．５０～＋０．８０‰，深层油田卤水的δ３７Ｃｌ为－１．２０～＋０．８０‰。沧州浅层卤水的δ３７Ｃｌ为－０．２５‰，烟台浅层咸水的δ３７Ｃｌ从－０．３３％。到－０．２０‰。浅层卤水及浅层咸水均属海水成因。
Chlorine has two stable isotopes; 35Cl (75.77%) and 37Cl (24.23%). In the past, the stable chlorine isotope ratio (37Cl / 35Cl) was almost unchanged. Since the 1980s, the use of high-precision mass spectrometry successfully discovered in nature chlorine isotope fractionation. Chlorine isotope composition of seawater at different depths is very consistent, so the standard average seawater chlorine (SMOC) as a comparative standard. Δ37Cl of freshwater and hot groundwater in Cangzhou, Hebei Province and Yantai, Shandong Province is -1.50 ~ + 0.80 ‰, while that of brine in deep oilfields is -1.20 ~ + 0.80 ‰. Δ37Cl of shallow brine in Cangzhou is -0.25 ‰, and δ37Cl of shallow salt water in Yantai is -0.33%. To -0.20 ‰. Shallow brine and shallow saltwater are sea water causes.