Cumulative production, reserves prospective resources are obtained from the Government's balance sheet of reserves as of 01.01.2009, and inferred resources are corrected by expertise by the value of change in balance reserves and prospective resources. These estimates form the basis of zoning of the territory by types of hydrocarbon fluids and density resources for Riphean, Nepa, Tira, Lower-Middle Danilovo, Upper Danilovo and Lower Cambrian complexes.