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Geological Society, London, Special Publications; 1990; v. 50; p. 473-489;
DOI: 10.1144/GSL.SP.1990.050.01.29
© 1990 Geological Society of London

Lena-Tunguska Upper Proterozoic-Palaeozoic petroleum superprovince

A. E. Kontorovich, M. M. Mandel’Baum, V. S. Surkov, A. A. Trofimuk & A. N. Zolotov

NPO Sibgeo, Sniiggims, Norosibirsk, USSR

The Lena-Tunguska Superprovince is the only region of the world where extensive economic Upper Proterozoic petroleum production is proved. This province extends the stratigraphical range of hydrocarbon accumulations to the deposits older than one billion years.

The Upper Proterozoic deposits are represented mainly by Riphean carbonate formations and terrigene carbonate sulphate-bearing sediments of Vendian (Eocambrian). These deposits cover an area of some two million square kilometres.

Oil and gas potential in the Vendian and Upper Cambrian sediments in the central and southern regions of the province is proven and more than thirty fields have been discovered. Sheet, roof, lithologically and tectonically screened and non-anticlinal pools dominate these discoveries. The Lower Cambrian salts are the regional seal.

Riphean petroleum potential has been proved in the western part of the province where the extensive Yurubcheno-Takhomsk zone of oil and gas accumulations occur within the Baikit antecline and Katanga Trough. Oils appear to be of one genetical type as low sulphur, naphthenic-rich oils containing n-alkanes, isoprenoids and are enriched in 12,13-monomethylalkanes, 12C carbon isotope.

The main current oil-producing plays are confined to Riphean Formations.





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