Potentially productive late Riphean sediments at the basis of the Nepa-Peleduy arch of the Nepa-botuobaanteclysis in the South of the Siberian platform
To date, the main deposits of oil and gas in the Cambrian and Precambrian section of the southern SiberianPlatform are con ned to the terrigenous part of the Precambrian sedimentary cover, while in the much more powerful halogen-carbonate complex of the Vendian-Cambrian and Lower Cambrian, few industrial hydrocarbon accumulations have been found [9]. Therefore, the carbonate complex is associated with the prospects of the largest reserve for the growth of oil and gas reserves. Along with the relevance of identifying the causes of the existing disproportion in the discovery of deposits, there is a need to assess the feasibility of the prospects for the carbonate complex on the basis of a discussion of the nature and mechanism of formation of deposits. Research methods: correlation and cross-correlation analyzes of maps of geological benchmarks and seismic re ecting horizons, as well as maps of hydrodynamic indicators based on well test data, the results of which were linked to the results of lineament analysis based on data from space surveys and potential elds. It is argued that deposits in productive strata of the Precambrian terrigenous complex were formed due to subvertical uid ows from sub-basement sources under the in uence of activation of faults of early northeastern generations, and in productive carbonate horizons of the Vendian-Cambrian and Lower Cambrian - due to the reformation of deposits in terrigenous deposits faults of the late northwestern generation. The deposits were formed at the same time in the zones of overlap with faults of the earlier generation, which determines the linear-zonal character of their distribution. This means that in carbonate reservoirs it is impossible to achieve advanced discovery of deposits and when determining the sequence of prospecting, terrigenous horizons should be considered as the main or priority ones. The research results are consistent with the distribution of deposits in 35 elds in the south of the Siberian platform.