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The given paper provides data on the fingerprints of Azerbaijani oils using biomarkers (GC/MS) and microelement composition (ICP/MS), as well as the main geochemical parameters of oil, such as CPI, Ki, QI, ITC, Ts/Tm, Pr/Ph, etc., and data on correlation dependencies of geochemical parameters on the horizon at particular oilfield. Characterization of oil accumulations belonging to the mid-Pliocene in the Caspian Sea in terms of hydrocarbons - biomarkers and geochemical parameters makes it possible to predict the composition and the predominant type of oil in the field with similar geological structure. Keywords: oil biomarkers; chromatographymass spectrometry; mass spectrometry with inductively coupled plasma; oil fingerprint.