--> Abstract: Upper Paleozoic Petroleum System of the Pechora Sea, by Oleg I. Suprunenko, Karina G. Viskunova, Ekaterina B. Suvorova, Vera I. Petrova, Evelina N. Preobragenskaia, Ludmila G. Povysheva, and Nikolai V. Ustinov; #90130 (2011)
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Upper Paleozoic Petroleum System of the Pechora Sea

Oleg I. Suprunenko1, Karina G. Viskunova2, Ekaterina B. Suvorova1, Vera I. Petrova1, Evelina N. Preobragenskaia1, Previous HitLudmilaTop G. Povysheva1, and Nikolai V. Ustinov1
1FGUP Gramberg's VNIIOkeangeologia, Saint-Petersburg, Russian Federation.
2OAS Nari'an-Marseismorazvedka, Saint-Petersburg, Russian Federation.

In this abstract is presented petroleum system work model of the Carboniferous-Lower Permian hydrocarbon deposits from fields located at Varandey-Adzva structure zone, the eastern part of the Pechora sea offshore. There are three oil field in this district: Prirazlomnoe, Varandey-more and Medyn-more. Oil of this deposits is resinous, sulfurous and has high density value (0,92-0,97 g\cm3). Geochemical data evident that this oil is biodegrade; the source of oil is predominantly sapropelic, marine genesis organic matter, which deposited in clay-carbonate rocks; the maturity degree reached “oil window” (MK1-MK2). It can be supposed that the source rocks are famennian-tournaisian clay-carbonate rocks. The thickness of overlayered rocks is varied from 1,7 to 2.5-3.2 km.

Collectors confined to the carbonate rocks: Upper Visean secondary dolomites, Middle-Upper Carboniferous and Lower Permian limestones (grainstones and rudstones). Traps are structural and tectonically-restricted. The seal is Lower Permian argillaceous siltstones and Lower Triassic silty argillites.

Famenian-tournesian source rocks had reached the “oil window” in Early Permian time, at this moment hydrocarbon generation begins. Oil deposits had formed in Triassic period. In Late Triassic - Earlier Jurassic time there was structural reconstruction in the district. This event influenced to the oil deposits, oil undergone by biodegradation processes.

This petroleum system have preliminary name: Upper Devonian (Famennian) - Carboniferous-Lower Permian supposed petroleum system. Probably this system is a part (subsystem) of more wide petroleum system, but it is considered separately. Varandey-Adzva district have some geological evolution features, which is led to the presence of heavy and biodegrade oil.

 

AAPG Search and Discovery Article #90130©2011 3P Arctic, The Polar Petroleum Potential Conference & Exhibition, Halifax, Nova Scotia, Canada, 30 August-2 September, 2011.

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