DETERMINATION AND MAPPING OF DEEP FAULTS BY SEISMIC DATA AND THEIR MANIFESTATION IN GEOPHYSICAL FIELDS

• Main Authors: V. S. Druzhinin, N. I. Nachapkin, V. Yu. Osipov
• Format: Article
• Language: deu
• Published: Ural State Mining University 2018-09-01
• Series: Izvestiâ Uralʹskogo Gosudarstvennogo Gornogo Universiteta
• Subjects: deep faults; DSS profiles; Ural; North Kazakhstan megablock; transition zone; geodynamic transformations
• Online Access: https://www.iuggu.ru/download/2018-3-5.pdf

Purpose of the study. Determination and mapping of deep faults of the upper part of the sial zone of earth according to seismic data and their manifestation in geophysical fields. Relevance of the work. Information about deep faults is contained in drilling results of super-deep wells to a depth of 12 km, as well as in seismic studies. However, authorial variants of deep seismic sounding (DSS) sections are often disposed of simple models without faults. Therefore, consideration of this issue is topical. Methods of research. Thematic works on the analysis of generalized seismic information on DSS profiles. Drawing up of sections and schemes of the consolidated crust of the southeastern margin of the Ural region. Results and their application. – Deep faults and sublatitudinal faults and folds supplemented by diagonal faults create a spatially complex picture of the structure of the earth’s crust. Ignoring such a situation leads to erroneous structural-tectonic structures. In particular, this concerns the regional mapping of the consolidated basement and the bottom of the bedding plane. – The non-linear character of the location of the main units of the Urals region is most strikingly manifested in the boundary structure along the eastern margin of the uralides itself, isolated in the latitude range 56ο–70ο N in the southeast of the Ural fold system, it is represented by a transition zone including the granite massifs of the Trans-Urals region and the western part of the Tyumensky-Kostanaysky depression. It consists of several deep faults, which have a common northeastern direction with deviations along the zones of sublatitudinal dislocations up to 50–70 km. – The transition zone has a different nature than the boundary structures of the continental crust of rift nature. It was created by moving from the west of volcanogenic-sedimentary deposits D-C and is located on the ancient North Kazakhstan uplift, which is emphasized by the western fall of deep faults. This conclusion is of predictive value in the search for hydrocarbon deposits in the lower sediments of the Ural region of the West Siberian oil and gas province. Conclusion. Information about deep faults is available in the registered geophysical fields. An urgent task is the development of new methods for their analysis and processing based on a fault block model suitable for the real geologic environment.