Halmeic formations and petroleum potential of the Siberian Platform

Authors
Citation
Gs. Fradkin, Halmeic formations and petroleum potential of the Siberian Platform, GEOL GEOFIZ, 42(4), 2001, pp. 605-616
Citations number
23
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGIYA I GEOFIZIKA
ISSN journal
00167886 → ACNP
Volume
42
Issue
4
Year of publication
2001
Pages
605 - 616
Database
ISI
SICI code
0016-7886(2001)42:4<605:HFAPPO>2.0.ZU;2-5
Abstract
Support is given to a two-stage model for the salinity of the cover of the Siberian Platform. Cambrian and Devonian halmeic formations are recognized in the section and traced laterally. Lower and Middle Paleozoic halmeic bas ins were limited by intermediate zones providing a persistent regime of sal t accumulation and supply of mother solutions From the vast seas covering t he territory of the Patom-Vitim Upland and Upper Yana region. Parameters ar e given, and paleostructural conditions of accumulation of these formations are characterized. In some regions and districts of the Lena-Tunguska petr oliferous province it has been observed that the industrial production of s ubsalt reservoirs depends directly on the regional persistence and thicknes s of the saliferous screen. The largest deposits occur in zones of thick te rrigenous sequences overlapped by regional carbonate-saliferous confining b eds. Hydrocarbon deposits have not been revealed in the Middle Paleozoic co mplex yet, though oil, gas. and bitumen occurrences exist there and the geo logostructural conditions (reservoirs, brachyanticlinal traps, etc.) are fa vorable for hydrocarbon accumulation. Taking into account regular relations hips in the Vendian-Cambrian complex, we suppose that the Devonian halmeic formation is also appropriate For accumulation and preservation of hydrocar bons in subsalt and intersalt reservoirs. The recognized structural features of Paleozoic halmeic formations, regiona l confining beds, permitted us to specify the earlier schemes of petroleum- geological regionalization of the Siberian Platform. In the Vendian-Cambria n complex, the main petroliferous belt is the Nepa-Botuobiyan and Baikit an teclises separated by the Katanga Saddle. In addition, the Berezovo, Kempen dyai, and Ygyatta troughs, Suntara uplift, and favorable structures of the central regions of the Angara-Lena trough are estimated as highly promising . The Devonian subsalt and intersalt reservoirs are of greatest practical i nterest in the favorable zones of the West Vilyui potentially petroliferous region. The Atyyakh, Uchugei, and Kedepchik structural stages are top-prio rity objects For seismic prospecting and deep drilling there.