Key words: oil, modern day hydrocarbon inflow, replacement of oil reserve, geochemical studies of oil, formation and re-formation of oil deposits.
Oil of the Minnibaevskaya area of the Romashkinskoye oil field was studied using complex of geochemical methods. It was found that in Pashiysky horizon simultaneously there are oxidized, biodegrade oil and light oil with a high degree of gas-condensate component. Development of geochemical criteria of localization zones oil and gas inflow was initiated. The first results prove the effectiveness of the using of these criteria. Geochemical investigations of oils can be used to delineate areas of modern day oil and gas inflow in the developed productive oil reservoir.
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