PRECAMBRIAN PETROLIFEROUS DEPOSITS ON THE SOUTHERN SIBERIAN PLATFORM: EXPLORATION FOR EXTRACTABLE HYDROCARBONS
D.I. Drobot, V.A. Pak, N.M. Devyatilov, G.A. Khokhlov, A.V. Karpyshev, and I.N. Berdnikov
RUSIA Petroleum Joint-Stock Company, 14 ul. Nizhnyaya Naberezhnaya, Irkutsk, 664041, Russia
Keywords: Migration, accumulation, oil, gas, condensate, reservoirs, sandstone, carbonate, brine, salt tectogenesis, petroleum source, deep-level phase of gas generation, Parfenov and Upper Chona Horizons, disjunction, porosity, permeability
Pages: 98-108
Abstract
Riphean source beds much contributed to the high hydrocarbon potential of Precambrian deposits on the Siberian Platform. Large amounts of hydrocarbons were accumulated in reservoir traps of the Angara-Lena and Nepa-Botuobiya petroliferous provinces. In the Angara-Lena province, gas fluids played a leading role in the formation of hydrocarbon pools. We consider a geological model, formation conditions, porosity and permeability, and regularities of occurrence of sand reservoirs in the Parfenov producing horizon of the giant Kovykta gas-condensate deposit. The hydrocarbon resources of the deposit are estimated at 2.5-3 x 1012 m3.
The Nepa-Botuobiya province is highly promising for large hydrocarbon accumulations. Considerable amounts of hydrocarbons are concentrated there in a subsalt carbonate complex. The geologic structure of the Verkhnechonskoe deposit is considered. The estimates show that the petroleum resources of the deposit can be increased 2-2.5 times, i.e., to 400-500 mln tons.
The discovery of large and giant petroleum deposits in the Precambrian deposits of the Siberian Platform provides a base for realizing a large-scale program on the development of new centers of oil and gas extraction in East Siberia.
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