Promising hydrocarbon systems of the Mangyshlak oil and gas basin

UDK: 553.98.061.32

DOI: 10.24887/0028-2448-2025-5-32-37

Key words: South Mangyshlak, stock depletion, Mesozoic, Paleozoic basement, Akzhar East, organic material, pyrolysis, hydrocarbon generation zone, no migration pathway

Authors: O.A. Emelianenko (Gubkin University, RF, Moscow); S.F. Khafizov (Gubkin University, RF, Moscow); G.A. Kalmykov (Lomonosov Moscow State University, RF, Moscow); M.L. Makhnutina (Gubkin University, RF, Moscow); M.T. Delengov (Gubkin University, RF, Moscow); A.G. Kalmykov (Lomonosov Moscow State University, RF, Moscow)

The main fields of the Uzen-Zhetybai stage have a high degree of depletion of hydrocarbon reserves associated with deposits of Mesozoic age. In this regard, the search for new deposits to replenish the raw material base is becoming an important task for the studied region. In addition to the Meso-Cenozoic part of the section, sediment productivity was also established in the underlying Paleozoic complexes, for example, the Oymasha field. Therefore, the expansion of promising territories and the discovery of new accumulations of hydrocarbons by studying deep-lying Paleozoic sediments using the latest data are becoming more important at the moment. An assessment of the processes of generation, possible migration and subsequent filling of potential structural traps was carried out; the development of drainage areas and their spatiotemporal relationship with the hydrocarbon generation zones were also studied. Various scenarios of the functioning of hydrocarbon systems are shown – the presence of source rocks (SR) only in Mesozoic sediments, as well as scenarios that take into account the influence of the proposed Paleozoic SR, considered using the analogy of the sediments on the eastern side of the Caspian Basin, and the influence of additional local warming of the SR. The presence of only Mesozoic SR does not enable to achieve the saturation observed according to actual data, including the phase composition.

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