f Geology, organic geochemistry and hydrocarbon reserves in the Arctic Zone of the West Siberian Basin

The Arctic Zone of the West Siberian basin includes the Yamal-Taz megasyncline and Southern Kara sea megatrough. This area occupies more than 1,200,000 km². The Yamal-Taz megasyncline devides the Yamal-Gydan and Nadym-Taz Sineclines, the Yenisey-Khatanga megatrough, and Messoyakha belt swells. Giant gas-condensate fields located on the megaswells system are: Kharasaveye - Novyy Port, Northern Yamal, Yamburg - Medvezhye, Urengoy and Russko-Chaselskeye. The active growth of this tectonic elements have taken place in Neokomian and Cenozoic times. West- East extention in late Permian to Early Triassic time created the main rift systems: West Omsk - Yamal and East Omsk - Urengoy - Cydan.