Caspian trough based on the results of basin modeling

UDK: 550.8.072

DOI: 10.24887/0028-2448-2025-5-61-66

Key words: Tersk-Caspian trough, clinoforms, Maikop, basin modeling

Authors: A.I. Mullagalieva (Gubkin University, RF, Moscow); K.I. Dantsova (Gubkin University, RF, Moscow); A.G. Sotnikova (Gubkin University, RF, Moscow; Russian Research Geological Petroleum Institute, RF, Moscow); O.A. Emelianenko (BGT RUS LLС, RF, Moscow); A.S. Kurushina (Gubkin University, RF, Moscow)

The article considers the results of reconstructing the history of oil and gas formation and accumulation in the Tersko-Caspian trough based on volumetric modeling of hydrocarbon systems. The oil and gas bearing systems of the Central and Eastern Ciscaucasia are characterized, and the factors influencing their formation are considered. The main foci of generation at each stratigraphic level were identified based on existing and assumed oil and gas source rocks. It is worth noting their high maturity and depletion in the central parts of the Tersko-Caspian trough, the on-board zones are characterized by low values of these parameters and continue to actively generate hydrocarbons. The oil and gas deposits in the reservoirs of the structural type were formed due to lateral and vertical fluid migration from different source rocks. The coincidence in terms of most of the discovered gas and oil fields with the accumulations obtained in the process of three-dimensional modeling indicates a good convergence of the results with the actual data. As a result of the modeling, the most promising local structures with possible hydrocarbon deposits in the most promising stratigraphic complexes were outlined. The clinoform complex of Maikop, which is the least studied by seismic exploration due to the orientation of geological exploration to deeper reflecting horizons, is considered one of the objects of possible reserve increment. The results obtained based on the results of two-dimensional modeling indicate favorable conditions for the generation, migration, accumulation and preservation of hydrocarbons in non-structural traps.

References

1. Lebed'ko G.I., Kuzin A.M., Geologo-geofizicheskaya interpretatsiya flyuidonosnykh zon zemnoy kory Severnogo Kavkaza (Geological and geophysical interpretation of fluid-bearing zones of the earth's crust of the North Caucasus), Rostov-na-Donu: Publ. of Southern Federal University, 2010, 302 p.

2. Yandarbiev N.Sh., Kozlova E.V., Fadeeva N.P. et al., Geochemistry of hydrocarbons of the Terek-Caspian trough (In Russ.), Georesursy, 2017, Special Issue, Part 2,

pp. 227–239.

3. Nemtsov N.I., Bereziy A.E., Gogonenkov G.N. et al., The results of regional exploration and prospecting activities of 2020–2022 and previous studies: update of hydrocarbon potential and exploration and prospecting priority areas in North Caucasus Federal District (In Russ.), Geologiya nefti i gaza, 2023, no. 4, pp. 176–190,

DOI: http://doi.org/10.47148/0016-7894-2023-4-176-190

4. Yandarbiev N.Sh., Fadeeva N.P., Kozlova E.V., Naumchev Yu.V., Khadum Formation of Pre-Caucasus region as potential source of oil shales: geology and geochemistry (In Russ.), Georesursy, 2017, Special Issue, Part 2, pp. 208–226.

5. Palaeogeographic atlas of the shelf regions of Eurasia for the Mesozoic and Cenozoic. Vol. 2. Maps: edited by Alekseev M.N., Robertson Group plc, UK & Geological Institute, Academy of Sciences, USSR, 1992, 104 p.

6. Babina E.O., Mordasova A.V., Stupakova A.V. et al., Sedimentation of the Oligocene-lower Miocene clinoforms of the Maikop formation in the Eastern and Central Pre-Caucasus region as a key criteria for reservoir exploration (In Russ.), Georesursy, 2022, V. 24, pp. 192–208, DOI: https://doi.org/10.18599/grs.2022.2.18