Geochemistry of Oil of Major and Unique Oil Fields of Russia

Abstract

Abstract

Despite substationtial depletion of oil reserves at the most productive fields, Russia continues to possess vast oil resources and significant petroleum potential.

The main regions that contribute to the replenishment of Russia's petroleum resources include West Siberia, East Siberia (Sokha Republic), Volga-Urals, Timan-Pechora petroleum-producing province. They are the largest and most prospective of reserves and petroleum potential offshore areas of Arctic and the Far Eastern shelves.

Modern researchers recognize 12 petroleum –producing provinces within territory of Russian. The most important ones include West Siberia, Volgo-Urals, and Timan-Pechora. In fact, 63 out of 65 large and unique oil fields were discovered within these three provinces.

West Siberia petroleum province –occupies a leading position in Russia as the largest identified within its hydrocarbon reserves and the level of oil production. A distinctive feature of the resource base is the large number of large and unique deposits of oil, such as Samotlor Mamontovskoye, Fyodorovskoye confined to large vaults and structures of the first and second order.

In the West Siberia Forty –nine giant and unique oil fields have been discovered within the province. Forty –seven of them are location in the Tyumen region and two in the Tomsk region. The group of giant fields in Tyumen region includes 9 unique fields: Samotlor, Krasnoleninsk, Mamontovo, Fedorovo, Priob, Lyantorsk, Vat-Yegan, Tevlinsk-Russkinsk, and Russkoye. The first four (Samotlor, Krasnoleninsk, Mamontovo, Fedorovo) are the largest ever discovered, each with recoverable reserves exceeding 500 million metric tons.

Most oil reserves of West Siberia are associated with the Lower Cretaceous and Jurassic elastics. Usually, petroleum accumulation found in multiple reservoirs. Most petroleum accumulations occur in anticlines, but a few (including large ones) are tied to statigraphic (lithological) traps. The depth of the main pay zones normally does not exceed 2700-2800 m. A portion of these are classified as difficult-to-recover and a occur as oil legs beneath gas caps in reservoirs with low permeability and complex structure. The same category of difficult-to-recover reserves includes accumulation of oil with high viscosity in Upper Cretaceous section.

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AAPG Datapages/Search and Discovery Article #90260 © 2016 AAPG/SEG International Conference & Exhibition, Cancun, Mexico, September 6-9, 2016