Oil source rocks of the intersalt Devonian complex of the Pripyat trough, conditions of their formation, degree of transformation and connection with oil and gas formation processes (East European platform)

Research subject . Oil-source rocks of the inter-salt Devonian complex of the Chervonoslobodsko-Malodushinskaya tectonic stage of the Northern area, tectonic stages of the Central and Southern areas of the Pripyat trough. Aim . Localization of the oil-source rocks zones, determination the relationship between the quality of oil-source rocks and sedimentation conditions, determination the degree of organic matter transformation in oil-source rocks and the edging of the “oil window” zones. Methods and material. Bituminological and pyrolytic methods in combination with data on the lithological rock composition. Results . Oil-bearing rocks have been identified and the quality and degree of transformation of organic matter have been determined. Oil-source rocks localization, their stratigraphic affiliation, and the immersion depth into the “oil window” have their own features in the Central, Southern, and Northern areas of the Pripyat trough . Conclusion . Sedimentation conditions influence geochemical quality indicators of oil-source rocks. Oil-source rocks of high and medium quality are formed under conditions of carbonate-clay sediment accumulation at paleo-depthes of more than 200 m. The hydrocarbon generation zones are confined to the foothills of the tectonic stages.