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52. Kovalevsky V.V., Fatyanov A.G., Karavaev D.A., Braginskaya L.P., Grigoryuk A.P., Mordvinova V.V., Tubanov Ts.A.,
Bazarov A.D. Research and verification of the Earth�s crust velocity models by mathematical simulation and active
seismology methods. Geodynamics & Tectonophysics. 2019;10(3):569-583. (In Russ.).
3. Grigoryuk A.P., Kovalevsky V.V., Braginskaya L.P. Investigation of the polarization of seismic waves during vibro-
seismic monitoring // Interexpo Geo-Siberia, 2018. V. 4. No. 2. P. 10-16 (in Russ.).
Mathematical modeling of electromagnetic fields of main pipelines cathodic protection systems
in electrically layered and anisotropic soils
V. N. Krizsky1, S. V. Viktorov2, O. V. Kosarev1, Ya. A. Luntovskaya1
1Saint-Petersburg Mining University
2Bashkir State University, Ufa
Email: Krizsky@rambler.ru
DOI 10.24412/cl-35065-2021-1-01-07
The geometric and physical properties of the containing pipeline soil play a significant role in the distribu-
tion of electric and magnetic fields generated in the cathodic anticorrosive electrochemical protection sys-
tems.
The paper considers mathematical models that are more adequate to practice (in comparison with those
currently in force in accordance with GOST), taking into account the layering [1] and anisotropy [2, 3] of the
specific electrical conductivity of the medium. The problems are solved by the method of fictitious sources.
The results of confirming comparative computational experiments are presented.
References
1. Krizsky V. N., Aleksandrov P. N., Kovalskii A. A., Victorov S. V. Modeling of Electromagnetic Fields of Pipelines
Cathodic Protection Systems in Horizontally-Layered Media // Science & Technologies: Oil and Oil Products Pipeline
Transportation. 2019. V. 9, N 5. P. 558�567. DOI: 10.28999/2541-9595-2019-9-5-558-567.
2. Krizsky V. N., Aleksandrov P. N., Kovalskii A. A., Victorov S. V. Mathematical Modeling of Electric Fields of Pipelines
Cathodic Protection Systems in Anisotropic Media // Science & Technologies: Oil and Oil Products Pipeline Transportation.
2020. V. 10, N. 1. P. 52-63. DOI: 10.28999/2541-9595-2020-10-1-52-63.
3. Krizsky V. N., Aleksandrov P. N., Kovalskii A. A., Victorov S. V. Mathematical Modelling of Electric and Magnetic
Fields of Main Pipelines Cathodic Protection in Electrically Anisotropic Media // E3S Web of Conferences. II International
Conference �Corrosion in the Oil & Gas Industry 2020�, 2021. V. 225. [Electron. resource]. URL: https://www.e3s-
conferences.org/articles/e3sconf/abs/2021/01/e3sconf_corrosion2020_04002/ e3sconf_corrosion2020_04002.html (the
date of access: 01.03.2021) DOI: 10.1051/e3sconf/202122504002.
Signals of electromagnetic tool with toroidal coils in highly deviated wells
I. V. Mikhaylov1, V. N. Glinskikh1, M. N. Nikitenko1, I. V. Surodina2
1Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
2Institute of Computational Mathematics and Mathematical Geophysics SB RAS
Email: MikhaylovIV@ipgg.sbras.ru
DOI 10.24412/cl-35065-2021-1-01-08
This study propels the research direction related to the electromagnetic logging tool with toroidal coils [1].
Its main goal is to expand the tool�s applicability from vertical well sections to those of highly deviated wells,
based on 3D finite-difference simulation [2] and multi-aspect analysis of the signals. The latter were obtained
in geoelectric models of oil-, gas- and water-saturated reservoirs with a different number of horizontal bound-
aries, varying reservoir thicknesses, including the case of fine layering.
This work was supported by the Russian Foundation for Basic Research (grant 19-05-00595).
References
1. Epov M., Mikhaylov I., Glinskikh V., Nikitenko M., Surodina I. Electromagnetic Logging Tool with Toroidal Coils for
the Study of Vertically Inhomogeneous Macroanisotropic Formations // EAGE Annual 2019, Extended Abstracts,
Th_R16_05.
2. Mikhaylov I., Glinskikh V., Nikitenko M., Surodina I. Electromagnetic Sounding with a Toroidal Source in Vertical
and Deviated Oil Wells: Numerical Simulation // EAGE Annual 2020, Extended Abstracts, Fr_E105_11.
Earthquake record processing algorithms to form a strong motion database
V. A. Mironov1,2, S. A. Peretokin2, K. V. Simonov1
1Institute of Computational Modeling SB RAS
2Krasnoyarsk Branch of the Federal Research Center for Information and Computational Technologies
Email: vasya-kun@mail.ru
DOI 10.24412/cl-35065-2021-1-01-09
This study is devoted to the development of algorithms and software for earthquake record processing.
The algorithms are based on the methodology used by the Pacific Earthquake Engineering Research Center for
the implementation of the scientific project NGA-West2 [1]. The purpose of processing is to determine reliable
values of ground acceleration and other parameters of earthquakes from the available records of velocity time
series. To analyze the operation of the algorithms, earthquake records (simultaneously recorded time series of
acceleration and velocity), taken from the European Rapid Raw Strong-Motion database [2], were used. The
developed algorithms and the implemented software will allow in the future to form a database of strong mo-
tions for building regional attenuation models on the territory of the Russian Federation.
References
1. Bozorgnia Yousef et al. NGA-West2 research project // Earthquake Spectra. 2014. V. 30, N. 3. P. 973-987.
2. Carlo Cauzzi, Reinoud Sleeman, John Clinton, Jordi Domingo Ballesta, Odysseus Galanis, Philipp Kastli. Introducing
the European Rapid Raw Strong-Motion Database // Seismological Research Letters. 2016. V. 87 (4). P. 977�986.
Grid method for estimating the velocity characteristic of complex medium
D. L. Pinigina
Novosibirsk State Technical University
Email: daria.pi789@gmail.com
DOI 10.24412/cl-35065-2021-1-02-90
An important problem in solving inverse problems in seismology associated with determining the geo-
graphic and energy characteristics of a seismic source is obtaining a priori information about the propagation
velocities of seismic waves. In heterogeneous media, in particular in the areas of volcanoes and faults, obtain-
ing a velocity pattern is sharply complicated due to the nonlinearity of the travel time curve of seismic waves
[1�3]. The paper proposes an approach to the calculation and assessment of local velocities of seismic P-waves
in the area of the Mount Karabetova mud volcano (the Taman mud volcanic province) based on the use of the
grid method. The numerical algorithm is tested on experimentally obtained arrival times of waves from a vi-
bration source of the SV-10/100 type for the Mount Karabetova mud volcano. Using the approach proposed a
zone of inhomogeneity introduced by the volcano and its approximate geometric dimensions have been iden-
tified. The obtained results of the distribution of local velocities are consistent with the geological structure of
