Comparative analysis of prospects for formation of large hydrocarbon accumulations in the north of the Tunguska Syneclise

The prospects for oil and gas potential of the northern Tunguska syneclise were estimated with regard to quantitative oil-geologic characteristics of Riphean-Paleozoic deposits overlapped by Permo-Triassic basalts. These characteristics were obtained for the first time for the inner regions of this syneclise. On the basis of spatial combination of the deepest (to 10 km and more) large negative structures of the platform cover and adjacent uplifts - potential zones of gas and oil accumulation, - the areas of the most probable formation of large accumulations of hydrocarbons were supposed. Two of them, Upper Khugdyakit and Khantaika, have been recommended for top-priority studies by parametric drilling to the depth of up to 3.5 km.