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Egorov A.S.,Saint Petersburg State University | Vinokurov I.Y.,Sevmorgeo | Kalenich A.P.,Sevmorgeo | Belevskaya E.S.,Saint Petersburg State University | Ageev A.S.,Saint Petersburg State University
7th EAGE Saint Petersburg International Conference and Exhibition: Understanding the Harmony of the Earth's Resources Through Integration of Geosciences | Year: 2016

Principal basis of the Earth's crust deep structure investigations of Barents-Kara region and adjusent continental structures are DSS and CDP seismic sections. Additional features of the crust are estimated by results of inverse problems of gravimetry and magnetometry, magnetotelluric data and results of geothermic modelling. On the basis of these diverse data the radial-zoning model of the Earth's crust was grounded. The principal objects of the model are: blocks (paleoplates) of continental type and interblock junction zones (structures of tension, compression or shear type). These objects are identified with confidence on geotransect sections and on maps as areas of geophysical parameters stationarity (blocks) or gradient zones (interblock junction zones). Comparison of coordinated map and deep sections of Barents-Kara region and adjusted continental structures provides imaging of regularities of spatial distribution of: cratons (East-European and Siberian); Grenvillian Barents fold area; Baikalian Timan-Pechora, Enisey an Taimyr fold areas; Hercynian Uralian and Central-West-Siberian fold areas; Cimmerian Paykhoi - Novozemelskiy fold area. Representation of sedimentary cover of Barents, Timan-Pechora, South- and North-Kara basins in the form of transparent layer of the map provides obtaining the principal new interpretation of deep structure of the Earth's crust features, tectonics and geodynamics of the region.

Molodtsov D.M.,Saint Petersburg State University | Roslov Y.V.,Sevmorgeo
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

We apply shortest-path method of seismic ray tracing to irregular tetrahedral grid, which is useful for modelling highly heterogeneous media with complex geometry of interfaces. To combine low computational complexity with satisfactory accuracy we introduce specially organized interpolation of traveltimes on the second-order grid. The algorithm is extended on multiple arrivals. Performance of the algorithm is studied in numerical experiments. © 2010, European Association of Geoscientists and Engineers.

Artyushkov E.V.,Russian Academy of Sciences | Belyaev I.V.,SEVMORGEO | Kazanin G.S.,Marine Arctic Geological Exploration Expedition | Pavlov S.P.,Marine Arctic Geological Exploration Expedition | And 2 more authors.
Russian Geology and Geophysics | Year: 2014

Consolidated crust in the North Barents basin with sediments 16-18. km thick is attenuated approximately by two times. The normal faults in the basin basement ensure only 10-15% stretching, which caused the deposition of 2-3. km sediments during the early evolution of the basin. The overlying 16. km of sediments have accumulated since the Late Devonian. Judging by the undisturbed reflectors to a depth of 8. s, crustal subsidence was not accompanied by any significant stretching throughout that time. Dramatic subsidence under such conditions required considerable contraction of lithospheric rocks. The contraction was mainly due to high-grade metamorphism in mafic rocks in the lower crust. The metamorphism was favored by increasing pressure and temperature in the lower crust with the accumulation of a thick layer of sediments. According to gravity data, the Moho in the basin is underlain by large masses of high-velocity eclogites, which are denser than mantle peridotites. The same is typical of some other ultradeep basins: North Caspian, South Caspian, North Chukchi, and Gulf of Mexico basins. From Late Devonian to Late Jurassic, several episodes of rapid crustal subsidence took place in the North Barents basin, which is typical of large petroleum basins. The subsidence was due to metamorphism in the lower crust, when it was infiltrated by mantle-source fluids in several episodes. The metamorphic contraction in the lower crust gave rise to deep-water basins with sediments with a high content of unoxidized organic matter. Along with numerous structural and nonstructural traps in the cover of the North Barents basin, this is strong evidence that the North Barents basin is a large hydrocarbon basin. © 2014.

Peshekhonov V.G.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Sokolov A.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Krasnov A.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Atakov A.I.,Sevmorgeo | Pavlov S.P.,JSC Marine Arctic Geological Expedition MAGE
4th IAG Symposium on Terrestrial Gravimetry: Static and Mobile Measurements, TG-SMM 2016 - Proceedings | Year: 2016

Joint analysis of marine and airborne gravity surveys in the Arctic basin has been applied. Geophysical works were conducted with the use of Chekan-AM and Chekan-AM model Shelf-E gravimeters. The results of the surveys have confirmed the urgency and feasibility of detailed investigation of the Earth's gravitational field in the Arctic basin. © State Research Center of the Russian Federation Concern CSRI Elektropribor, JSC, 2016.

Tabyrtsa S.,Sevmorgeo
Saint Petersburg 2012 - Geosciences: Making the Most of the Earth's Resources | Year: 2012

In 2011 at the Arctic Ocean were execution of seismic work to estimate the thickness and velocity of the major complexes of the sedimentary cover of the Arctic Ocean to study the external limits of the continental shelf of the Russian Federation on the criterion of one percent sedimentary cover. Seismic activities included: continuous reflection profiling (short streamer 600m) and reflection-refraction sounding (radio telemetry system BOX). This report describes the work of the reflection-refraction sounding.

Polovkov V.V.,Sevmorgeo
Saint Petersburg 2012 - Geosciences: Making the Most of the Earth's Resources | Year: 2012

Refracted waves usually removed for processing and interpretation of the marine seismic data. However, they can provide additional information about the structure of the section and the presence of local low velocity zone. In this work the seismic section of the refracted waves along the profile 5-AR (East Siberian Sea) was constructed. With help the refracted and reflected waves was detected the low-velocity anomaly due to hydrocarbon deposit. Made refinement of the structure of the upper part of the lifting of Wrangel. Showed the advantage of using refracted waves for processing of the multichannel marine seismic data. Proposed to use the refracted wave in the processing and interpretation of marine seismic data. Showed the original method of determining the low-velocity anomalies, wich located in the sedimentary rocks.

Ivanova N.M.,Sevmorgeo | Sakulina T.S.,Sevmorgeo | Belyaev I.V.,Sevmorgeo | Matveev Y.I.,Sevmorgeo | Roslov Y.V.,Sevmorgeo
Geological Society Memoir | Year: 2011

In 1995-2006 FSUE 'Sevmorgeo' within the framework of the Federal Program of state survey baselines network development performed geophysical works in the Barents and Kara seas along four regional profiles: 1-AR (Kola Peninsula-Heysa Island of Franz-Joseph Land Archipelago); 2-AR (Central part of the Barents region-Novaya Zemlya - Yamal Peninsula); 3-AR (White Sea-Severnaya Zemlya Archipelago); and 4-AR (Taimyr Peninsula-Franz-Joseph Land Archipelago). Geophysical surveys included works using seismic refraction-deep seismic sounding technique, seismic reflection-common-depth point technique, seismic acoustic profiling and gravimetric and magnetic measurements. Integrated geophysical surveys along the regional profiles enabled more exact definition of the Earth deep crustal structure and the sedimentary cover of the main tectonic elements. © 2011 The Geological Society of London.

Ivanova N.M.,Sevmorgeo | Belyaev I.V.,Sevmorgeo | Sakulina T.S.,Sevmorgeo | Roslov Y.V.,Sevmorgeo
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010

The considered territory covers the northern part of the Kara Shelf and an adjacent onshore of the Severnaya Zemlya Archipelago and Taimyr Peninsula. Geophysical investigations (seismic wide-angle reflection/refraction profiling - WARRP, multichannel seismic - MCS, and gravity/magnetic measurements) along regional lines 3-AR and 4-AR allow to connect geological data of the Island Pioneer (Severnaya Zemlya Archipelago) and northern part of the Taimyr Peninsula, and to provide new data concerning the deep structure of the North-Kara Terrane (plate). The purpose of this article is to illustrate new results about the deep geological structures of the North Kara Terrane. The full section of the Earth s crust with basic crust boundaries and intra-sedimentary horizons was first studied in the North-Kara Terrane. The sedimentary cover is composed of the thick Vendian, and Cambrian terrigenous sediments, mainly carbonate rocks of the Lower and Middle Paleozoic, terrigenous-carbonate deposits of the Upper Paleozoic, and thin terrigenous Mesozoic-Cenozoic sediments. The total thickness of the Paleozoic sediments exceeds the thickness of the overlying Mesozoic sediments to a great extent. New information about deep Paleozoic complexes of sedimentary cover is important for evaluation of the hydrocarbon potential of this northern region.

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