GRISHIN, M. P., A. E. KONTOROVICH, V. I. LOTYSHEV*, N. V. MELNIKOV, and V. S. SURKOV, Siberian Research Institute of Geology, Geophysics, and Mineral Resources, Novosibirsk, Russia

ABSTRACT: Petroleum Potential of Baikit Anteclise, Siberian Platform

The Baikit Anteclise lies east of the Yenisei ridge, and it occupies an area of 155, 000 sq km of the western part of the Siberian platform. The major structure of the anteclise outlined by seismic survey is the Kanovsky arch, complicated by three domal uplifts. The basic petroleum potential of the area is associated with Riphean, Vendian, and Cambrian complexes.

The Vendian is represented mainly by mudstones interbedded with sandstones and siltstones. Two layers have proven potential for gas. Four carbonate horizons in the Cambrian are regarded as potential reservoirs with a total thickness of 20-300 m.

The most important petroleum potential in the area is associated with the Riphaean. From seismic and deep drilling evidence, its total thickness ranges from 0 to 3000 m. Source rock data and distribution of organic matter and its level of catagenetic transformation lead to the conclusion that the Riphaean complex is a petroleum-generating complex likely to be the most productive within the Baikit region.

This region is currently an area of special interest for petroleum geologists because for the first time, the Riphaean has proved to be of commercial importance with the discoveries of the large Yurubcheno-Tokhoma oil and gas accumulations.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.