The prospective opening object of oil and gas deposits is the basin of Mid-Upper Devonian sediments (the Tartass series), developed within the Nurolsk structure-facial district of West Siberian geosineklise. The peculiarities of rocks composition suggest a gradual immersion bottom basin, concluded the accumulation of the silicon-argillaceous sediments in the orogenic stage and the subsequent again-katagenezis development stage of the region. Due to these stages, there were formed the rocks-collectors.