Validation of Some Elements of the New Model of the Nepa-Peleduy Arch Subsurface Structure of the Nepa-Botuoba anteclise in the East of the Siberian Platform

Abstract

The studies were carried out on the Nepa-Peleduy arch (NPA) of the Nepa-Botuoba anteclise, the territory strategically important for the Russian Federation, where large and unique hydrocarbon deposits were discovered including those for the ESPO oil pipeline and the “Siberian Force” gas pipeline, which is under construction. The problem is in increasing the oil resource volume, as the hydrocarbon potential of the sedimentary mantle is largely exhausted. The evidence for the hypothesis by B.A. Sokolov, the Corresponding Member of the RAS, that the allochthonous crystal plate overlapping the aulacogen with Riphean deposits underlies in NPA, opens the possibility of increasing the hydrocarbon reserves in the “subfoundation” formations in the arch. Moreover, it can as clarify the controversial nature of the NPA deposits, which sedimentary mantle lacks deposits with a high content of organic carbon . We observe the Hilbert transform of the time section of the CDP method for the fragment of the “Batolith- 1” geotraverse, passing through the Katanga Saddle, the NPA and the Cis-Patom foredeep, and geophysical materials and the data of the wells on it. Based on the original constructions on geological and geophysical data and modeling, related to the development of the abovementioned hypothesis arguments for confirming the existence of a crystalline plate opened by the wells at the base of the NPA and the reality of the development of the Lower Vendian and Riphean deposits beneath it were obtained. The inversion paleorift’s western side position is outlined, the thickness of the plate and the oilfield characteristics of the deposits under it predicted are estimated, which can serve as a justification for the expediency of exploration of “subfoundation” deposits.