A new look at the deep structure and oil and gas potential of the Pre-Caspian basin based on the results of the first phase of the Eurasia project
Kuandykov B.M. Eskozha B.A. Kuantaev N.E.
2024Neftyanoe Khozyaistvo
Neftyanoe Khozyaystvo - Oil Industry
2024#2024Issue 124 - 30 pp.
The Pre-Caspian megabasin is a large oil and gas basin with a unique geological structure. However, the region remains poorly studied, with uneven drilling and seismic sections limited in length. The presence of thick salt strata and morphological features create difficulties during geological exploration, their interpretation and forecasting of hydrocarbon potential. The results of the study allowed authors to establish the complex structure of the depression, including the Archean and Baikal basement. The study of geophysical materials, especially seismic data, makes it possible to revise the concept of the structure and history of the development of the southeastern margin of the Pre-Caspian depression. Within the limits of the North Caspian and Temir uplifts of the depression, numerous protrusions of the foundation have been revealed, which are overlain by Paleozoic sedimentary rocks. These protrusions contain promising traps for hydrocarbons at depths up to 7–8 km. The block structure of the foundation determines the features of the subsalt sedimentary complex of the basin. The study of the Pre-Caspian basin showed the presence of isometric uplifts, such as Kashagan and Tengiz, as well as a system of narrow uplifts of the eastern side zone. As a result of modeling the migration of oil and gas from source strata, it was revealed that about 4,70 trillion tons of hydrocarbon fluids emigrated, mainly liquid. The analysis of structural maps has shown the possibility of migration and filling of potential traps in the Lower Permian, Visean-Bashkir and French-Famen oil and gas complexes. The obtained simulation results made it possible to successfully reproduce the main deposits in the studied area, reflecting real data. The deposits in the west of the depression are characterized by a high content of gaseous hydrocarbons, while in the east the liquid fraction predominates, corresponding to the more oil potential of the eastern side of the Pre-Caspian depression. In the central part of the depression, exclusively gas accumulations are formed associated with the migration of gas from the oil and gas source strata. In the northern side zone, there is an increased content of liquid components. An increased content of gaseous hydrocarbons was detected on the Astrakhan platform. In the south of the Caspian sea, accumulations of hydrocarbons are observed in all the complexes under consideration. Modeling also showed the presence of new promising zones at various stratigraphic levels. Particular attention is paid to the formation of gas condensate accumulations in the central part of the depression.
oil and gas potential , Pre-Caspian basin , Сaspian sea
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Meridian Petroleum LLP, Almaty, Kazakhstan
Meridian Petroleum LLP
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