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The Kara Sea offshore reveals Yuzhno-Karskaya oil and gas bearing province (OGP) with proved commercial gas content of Cretaceous deposits and two oil and gas bearing prospects: Zapadno-Karskiy and Prinovozemelskiy. Oil and gas bearing areas have prospective zones of oil and gas accumulation related to swell-like and dome-like elevations. Analysis of geological structure and oil and gas accumulation conditions in West-Yamal offshore area allows to suppose that Yuzhno-Karskaya OGP,Zapadno-Karskiy and Prinovozemelskiy prospects have different stratigraphic intervals of location of the main HC resources. They differ by phase state as well