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REPRESENTATION ABOUT THE FORMATION OF HYDROCARBON DEPOSITS IN THE RIPHEAN-LOWER-PALEOZOIC SEDIMENTARY BASIN IN THE SOUTHERN SIBERIAN PLATFORM
Abstract
To date, the main oil and gas deposits in the Cambrian and Precambrian section of the south of the Siberian platform are confined to the terrigenous part of the Precambrian sedimentary cover, while in a much more powerful halogen-carbonate (HC) complex of the Vendian-Cambrian and the Lower Cambrian, the little commercial hydrocarbon accumulations were found. Therefore, the prospect of the largest reserve for increasing oil and gas deposits is associated with the carbonate complex. Along with the urgency of identifying the causes of existing imbalance in the development of deposits, there is a need to assess the realistic prospects of carbonate complex based on the discussion of nature and the mechanism of deposits formation. Methods of the study: correlation and cross-correlation analyzes of maps of geological reference points and seismic reflecting horizons, as well as maps of hydrodynamic performance according to the well test data, the results of which were correlated with the results of linear analysis based on data from space surveys and potential fields. In the synchronous deposits of a single Riphean-Lower Paleozoic basin in the south of the Siberian platform, the linear destructive zones are identified, which inherit the strike of formerly activated basin-forming fault systems of various directions and generations that influenced the HC deposits formation and disintegration. As a result, a discordant correlation of local structural plans of the deposit in the carbonate formation and the deposit in the Precambrian terrigenous deposits is established on multi-layer deposits. It is argued that deposits in the productive formation of the Precambrian terrigenous complex were formed due to sub-vertical fluid flows from sub-fundamental sources under the influence of fault activations of early northeastern generations, and in the productive carbonate horizons of the Vendian-Cambrian and Lower Cambrian - due to the re-formation of deposits in terrigenous formations under the influence of faults of late north-western generation. At the same time, the deposits were formed in the zones overlapping to faults of earlier generation. This means that in the carbonate reservoirs it is impossible to achieve the advanced development of deposits, and in determining the order of prospecting the terrigenous horizons should be considered as basic or priority. The results of the studies are consistent with the deposits distribution on 35 fields in the south of the Siberian Platform.
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