The paper provides an analysis of the results of isotope-geochemical studies of rocks and oils of the Cenozoic-Mesozoic section of the South Caspian Basin (SCB) over the past 30 years. As a result, the previously established fact of the heavy carbon isotope composition (ICC) of organic matter (OM) of Miocene rocks (Diatom Formation), as well as its derivative oils accumulated in the main (Lower Pliocene) reservoir of the SCB, were confirmed. To verify the global nature of this phenomenon, a comparative analysis of isotope-geochemical data on sedimentary basins of 18 countries was carried out. A generalized diagram showing the limits of change in the ICC of kerogen and oils and their average values for various stratigraphic complexes for all considered basins has been constructed. It has been established that this phenomenon is also characteristic of other basins of the world. Based on this, a conclusion was made about the global nature of this phenomenon. The reasons that led to the isotopic shift in the global carbon budget that occurred in the Miocene are not completely understood. The existing ideas about its possible nature are considered. The results once again confirmed the effectiveness of using δ¹³C for oil-oil and oil-source rock correlation in combination with other geochemical criteria.

Keywords: carbon isotope composition, organic matter, oil, sedimentary basins, Miocene, Pre-Miocene

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