Geochemical investigations are being an inalienable part of oil-geological researches and are being hold at different stages. Regional investigation stage is not finished during the stage investigations of Precambrian deposits of ancient platforms. The main task of geochemical investigations during this stage includes emphasizing of oil-source horizons, their qualitative and quantitative characteristics: determination of genetic types of organic matter, its maturity level, oil-source potential and its realization degree, investigation of composition of naphtides (in case they exist) and possible determination of genetic connections of them with concrete oil-source horizons.

Perspectives of oil-bearing capacity of the regions from the geochemical point of view are being determined by the productivity of oil- and gas-formation centers, i.e. presence of oil- and gas-source rocks of sufficient thickness and organic matter maturity level.

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