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THE HYDRODYNAMIC FIELD STRUCTURE OF SEDIMENTARY COVER OF THE LENA-TUNGUSKA PETROLEUM PROVINCE WITHIN THE SIBERIAN PLATFORMЫ

A. I. Surnin, I. V. Litvinova, A. A. Shamanova

Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

The hydrodynamic conditions in petroleum plays of the sedimentary cover deposits of the southwestern Lena-Tunguska petroleum province in the territories of the Baykit, Katanga, Angara-Lena and Nepa-Botuoba regions are assessed and a general characteristic of producing horizons in the main petroleum plays is given. The authors presented their position relative to prospecting significance of hydrodynamic indicators for the forecast of petroleum potential, which reflect the influence of geotectonic factors on fluid migration processes at various stages of the basin history. Hereupon, the basic principles of regional hydrodynamic zoning of petroleum territories for changing the hydrodynamic field intensity in plays are discussed. The non-hydrostatic coefficient of reservoir pressures is used as an indicator of hydrodynamic tension, which allows researchers to assess the degree of “equilibrium”/“disequilibrium” of the hydrodynamic system. Hydrodynamic regimes in aquifer systems were classified according to the non-hydrostatic coefficient and regional hydrodynamic zoning was performed for the Riphean-Vendian and Vendian-Lower Cambrian petroleum plays. Regional patterns of the hydrodynamic field variability are discussed. Besides, zonal features of hydrodynamic conditions in various areas of the studied territories are considered.

Keywords: petroleum play, fluid-bearing horizon, hydrodynamic regime, reservoir pressure, non-hydrostatic coefficient, hydrodynamic barrier.

DOI 10.20403/2078-0575-2024-4b-99-106

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