Large gas reserves have been discovered in the Vendian terrigenous rock complex of the Angara–Lena step in the southern Siberian Platform. In recent years, regional and areal exploration has yielded substantial data on the structure of gas-promising sedimentary strata and their reservoir properties. The author has analyzed the main structural features of Vendian gas-producing deposits and has made deterministic and probabilistic estimation of initial hydrocarbon resources in place with regard to the discovered field reserves.

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