ACCOUNTING FOR PRODUCTIVE DEPOSITS HETEROGENEITY IN GEOLOGICAL MODELILING IN ORDER TO IMPROVE AN EFFICIENCY OF WATER-ALTERNATED-GAS INJECTION Article Strakhov P.N., Belova A.A., Markelova A.A., Strakhova E.P. Neftyanoe Khozyaystvo - Oil Industry. Neftyanoe Khozyaistvo. Vol. 2021. 2021. P. 46-49