The article is devoted to comparative description of geology for North America oil-and-gas-bearing basins – Appalachians and Rocky Mountains (within the USA) according to American geologists D. Hall, M. Kay, F.B. King and Russian scientists I.V. Vysotskiy, M.S. Burshtar, M.S. Lvov. In these regions (and in other oil-and-gas-bearing areas of the globe) industrial oil content belongs to submontane troughs and has been identified in intermountain depressions within folded areas. The main characteristic features of Bashkir Southern Urals intermountain depressions geology has been considered according to M.A. Kamaletdinov and V.N. Puchkov. It has been shown that Bashneftegeofizika JSC and Bashneft Company had carried out in the territory of Southern Urals gravity exploration, seismic survey and deep wells drilling in order to study gas prospects of this region. Obtained geological and geophysical data point to tectonic similarity of North American oil-and-gas-bearing basins and Bashkir Southern Urals intermountain depressions. But there are data showing lack of the latter oil and gas bearing, including undetermined development of covers in regional or semi-regional extent; far less share of pore type reservoirs than that of shale reservoirs of depression type having low filtration properties; discovered local bodies of anticlinal type are separated by disjunctives series which are unfavorable for appearance and conservation of traps, and this explains their hydrogeological opening. Moreover, geochemical research has showed that the main phase of oil formation occurred before basic folding phase, and this calls into question maintenance of potential hydrocarbon accumulations. Latest seismic surveys on a section of Zilair synclinorium, where one of wells had identified non-industrial hydrocarbon gas inflow, have detailed earlier identified local bodies. Nazar gravity anomaly, now being interpreted as a favorable object for industrial gas accumulation at a depth of 6.0-7.0 km, has been confirmed by structural construction. The need of further phased (territorially) geological survey for intermountain depressions of Southern Urals Bashkir part for obtaining reliable data on their oil and gas prospects has been demonstrated.
References
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