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SUMMARYBy results of researches the similarity of biomarker parameters of Saratov and Orenburg oils by origin and geological age is revealed. For most of the genetic parameters, the oil of the Orenburg field is of type A1, of marine origin, generated under reducing conditions; Oil is characterized by an elevated metal content. Petroleum of Saratov deposits is generated under sub-regenerative conditions in coastal-marine horizons; In them there are practically no metal-containing compounds.

SUMMARYThe article presents the results of the interpretation of a complex geochemical study of the organic matter of samples of different age of Paleozoic rocks from wells in the southern part of the PreUrals foredeep. It was found that in all the studied oil and gas complexes (Lower Devonian -Frasnian, Frasnian -Tournaisian, Visean -Bashkir and Lower Permian) have their own syngenetic source rocks characterized by different generational potential and confinement to a particular litho-facies zones.

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