The structure of the Upper Jurassic delta system within the Vakh zone of oil and gas accumulation was analyzed on the basis of geological and geophysical information obtained from 1500 wells of prospecting and exploitation drilling. Differences in the structure of deltas of various ages of a single delta complex, characteristics of formation of oil deposits in the reservoirs of deltas of various types, and differences in the parameters of development of sandstones of different facies have been shown.

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