Geological structure and fluid dynamics of the West-Siberian basement (in the east of KMAD). K.S. Ivanov, V.B. Pisetsky, Yu.V. Erokhin,V.V. Khiller, O.E. Pogromskaya

The results of studies are presented, during which a significant amount of new geological and geophysical data on the basement of the eastern part of the Khanty-Mansiysk Autonomous Okrug - Yugra (KhMAO) was obtained. Based on a comprehensive geological and geophysical analysis, a geological map of the pre-Jurassic basement of the east of the Khanty-Mansiysk Autonomous Okrug (scale 1 : 500000) was compiled with an inset on a scale of 1 : 200000 for the Pylkaraminsky area. A comprehensive analysis of potential fields, structural maps for the main reflectors, a digital model of the daytime relief and time sections for regional seismic profiles has been performed. Models of the fluid-dynamic structure of the basin at a scale of 1 : 200000 within the boundaries of the eastern part of the Khanty-Mansi Autonomous Okrug and at a level of 1 : 100000 within the Pylkaraminsky area were created. A tectonic zoning of the basement of the east of the Khanty-Mansiysk Autonomous Okrug was carried out and 8 submeridional structural-formational zones were identified, differing in the set and structure of their constituent formations, the history of geological development and, accordingly, physical fields. A comprehensive study of petrography, petro- and geochemistry, biostratigraphy, as well as geochronology and isotopy of pre-Jurassic formations in the eastern part of the Khanty-Mansiysk Autonomous Okrug was carried out using core samples from deep wells.