Special Features of Hydrocarbon Migration and the Mechanism of Oil Trap Filling in the Productive Series

The Oligocene-Miocene source rocks, both in good sections and at outcrops, macro, and micro features of thetexture of these rocks, thermodynamic conditions of their occurrence main forms, phases, directions, and distance of migrationof hydrocarbons in geological conditions of the SCB were examined. These comprehensive studies allowed a more completeunderstanding of the formation of hydrocarbon fields in the geological conditions of the SCB. The various efficiencies of theexpulsion of hydrocarbons from source rocks in various parts of SCB are concluded. The transport of oil in the form of amolecular solution in connate waters cannot be considered in the SCB as a potential mechanism of primary migration of oilbecause the bulk of these waters was discarded up to the depth of 3-4 km, but oil window is situated at depths interval 5-9 km.The primary migration of oils is assumed mainly in the gas/gas-condensate phase.