In the Molasse basin of southern Germany, a distinct differentiation of four regionally connected groups of oils can be inferred from the results of the ^dgr^lgrC₁₃ values and chemical analyses of the organic fractions. The differences between primary and secondary processes which caused isotope fractionation effects, and the principal correlations of chemical and isotopic data have geologic relevance. Probable models of the origin and occurrence of crude oils in the Molasse basin have been derived from geologic observations and geochemical results.

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