Results of the processing by statistical analysis methods of the component composition of Volgian and Neocomian oils from the Korchagin oilfield (northern part of the Caspian Sea water area) are presented. The component composition of the samples has been studied by simulated distillation using GLC. The values of the Fisher test and Student t-test have been calculated for the test samples on the basis of the results, with comparative assessment of the quantitative composition of the oils being carried out using these values. The analysis of the presented information has led to the conclusion that the oils of the Volgian and Neocomian superstages are similar in component composition by the mean and variance at a significance level of 0.05.