ABSTRACT: Proterozoic Sedimentary Basins of North Asia and Their Petroleum Potential

KONTOROVICH, A. E., Institute of Geology, Siberian Branch, Novosibirsk, Soviet Union, V. S. SURKOV, M. P. GRISHIN, A. I. LARICHEV, N. N. MELNIKOV, NPO, SibGeo, and S. A. KASHCHENKO, and G. S. FRADKIN, Institute of Geology, Siberian Branch, Novosibirsk, Soviet Union

Petroleum potential of the upper Proterozoic of north Asia is associated with the Riphean and Vendian deposits of the Siberian Platform. The Riphean marginal rift basins made of huge sedimentary stratum, which are represented by black shale formations (overmature at present) with high source potential are identified within the Siberian Platform. The Riphean oil and gas bearing basins of syneclises and aulacogens are identified within its inner portions. Oil generative potential of theirs composing formations is significantly smaller.

The Vendian deposits form continuous cover the largest portion of the Siberian Platform area. Their thickness increases in pericratonal subsidence.

The main regions of the Upper Proterozoic petroleum accumulation are Nepo-Botuoba and Baikit anteclises, Angara-Lena step and

Katanga saddle. At present more than 30 oil fields are discovered within these regions. Pools are confined to the Riphean and upper Vendian carbonate and Lower Vendian terrigenous deposits. Structural, tectonically, and lithologically screened and lithological deposits predominate mostly. Gas, oil and gas, and more rarely oil pools are identified. The models of pool formation are considered.

AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)