Multiparameter approach in the deep geoelectrics

Authors

  • I. I. Rokityansky Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine
  • A. V. Tereshyn Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Ukraine

DOI:

https://doi.org/10.24028/gzh.v43i5.244081

Keywords:

deep geoelectrics, response function, Earth electrical conductivity

Abstract

The main provisions of geoelectrics are described, the importance of taking into account the ambiguity of its inverse problem is emphasized. Three main methods of deep geoelectrics which use natural fields of ionospheric-magnetospheric origin are considered: geomagnetic deep sounding (GDS), magnetotelluric sounding (MTS), and magnetovariational profiling (MVP). The response functions of each method are described. Each response function carries its own specific information about some parameters of the studied object and is characterized by the degree of reliability of the information about the object extracted from it. For example, the most reliable information about electrical conductivity anomalies (if any in the study area) is contained in the MVP response functions. The horizontal tensor of the anomalous field contains information about the electrical conductivity under the observation point, and the tipper (induction vector) contains information from the surrounding areas. In general, MVP information is less susceptible to distortions than MTS information and deserves more trust. Artificial field sources in deep geoelectrics are rarely used due to their high cost. Since 1970, two powerful sources created for other purposes arised on the Kola Peninsula and were used for deep sounding. In the center of these studies found themself young talented geologist-geophysicist and organizer of major projects AbdulkhaiAzimovichZhamaletdinov. The «Khibiny» project with an MHD generator and an ultra-deep well as one of the objects of the study, the «Zeus» low-frequency emitter, the signals of which were recorded in China at a distance of 7000 km, and a number of projects conceived and organized by Zhamaletdinov and executed under his leadership: «Volgograd-Donbass» (1979, 1986), experiments «PHOENIX» (2007, 2009, 2014, 2019) and others. At the same time, methods of interpretation were developed for sounding with artificial EM sources and new response functions were obtained which make it possible to «see» the object of research in a new way. This experience must be preserved, generalized, improved and used, for example as follows. In the area of modern synchronous multipoint MTS-MVP survey, a controlled source composed of two grounded lines emits strong current (harmonics at fixed frequencies and/or pulses) which signal will be recorded by survey instruments during night-time sessions.

References

Berdichevskiy, M. N., Vanyan, L. L., & Faynberg, E. B. (1969). Frequency sounding of the Earth based on the results of spherical analysis of electromagnetic variations. Geomagnetizm i aeronomia, (9), 372—374 (in Russian).

Vanyan, L. L. (1997). Electromagnetic soundings. Moscow: Nauchnyy Mir, 218 p. (in Russian).

Velikhov, Е. P. (Ed.). (1989). Geoelectric research with a powerful current source at the Baltic Shield. Moscow: Nauka, 272 p. (in Russian).

Velikhov, Е. P., Zhamaletdinov, А. А., Tokarev, A. N., Asming, V. E., Shevtsov, A. N., Gurevich, A. E., Kova¬lev¬skiy, V. A., Merzheevskiy, V. A., Teterin, V. P., Baysarovich, M. N., Ingerov, A. I., Popov, V. M., Vanyan, L. L., Rokityansky, I. I., & Sapuzhak, Ya. S. (1989). Theexperiment «Volga» on Earth’s crust deep sounding using a DC power line. Doklady AN SSSR, 307(5), 1077—1081 (in Russian).

Velikhov, Е. P., Zhamaletdinov, А. А., Shev¬tsov, A. N., Tokarev, A. D., Kononov, Yu. M., Pesin, L. B., Kady¬shevich, G. M., Pertel, M. I., & Veschev, A. V. (1998). Deep electromagnetic research using powerful extra-low-frequency radio installations. Fizika Zemli, (8), 3—22 (in Russian).

Zhamaletdinov, А. А. (1996). Graphite in the Ear¬th’s Crust and Electrical Conductivity Anomalies. Fizika Zemli, (4), 12—29 (in Russian).

Zhamaletdinov, А. А. (2020). Kola superdeep well SD-3 — 50 years. Geofizicheskie protsesy i biosfera, 19(4), 94—116. https://doi.org/10.21455/GPB2020.4-7 (in Russian).

Zhamaletdinov, А. А. (1990). Model of the electrical conductivity of the lithosphere based on the results of studies with controlled field sources (Baltic shield, Russian platform). Leningrad: Nauka, 159 p. (in Russian).

Zhamaletdinov, А. А. (2011a). On the fluid nature of intermediate conductive layers in the earth’s crust based on the results of electromagnetic sounding and superdeep well logging. Fizika Zemli, (1), 1—11 (in Russian).

Zhamaletdinov, А. А. (2011б). Theory and methodology of deep electromagnetic sounding with powerful controlled sources. Materials of the 5th All-Russian School-Seminar on Electromagnetic Earth Sounding (pp. 21—51). St. Petersburg: Edition of St. Petersburg University (in Russian).

Zhamaletdinov, А. А., Kovalevskiy, V. Ya., Pavlovskiy, V. I., Tanachev, G. S., & Tokarev, A. D. (1982). Deep electrical sounding from 800 kV DC transmissionlines «Volgograd-Donbass». Doklady AN SSSR, 265(5), 1101—1105 (in Russian).

Zhamaletdinov, А. А., Shevtsov, A. N., Velikhov, E. P., Skorokhodov, A. A., Kolesnikov, V. E., Korotkova, T. G., Rya¬zantsev, P. A., Efimov, B. V., Kolobov, V. V., Barannik, M. B., Prokopchuk, P. I., Selivanov, V. N., Ko¬py¬ten¬ko, Yu. A., Kopytenko, E. A., Ismagilov, V. S., Petrishchev, M. S., Sergushin, P. A., Tereshchenko, P. E., Sam¬so¬nov, B. V., Birulya, M. A., Smirnov, M. Yu., Korya, T., Yampolsky, Yu. M., Koloskov, A. V., Baru, N. A., Po¬lya¬kov, S. V., Shchennikov, A. V., Druzhin, G. I., Dzhozviak, V., Reda, Ya., & Shchors, Yu. G. (2015). Study of the interaction of ELF—SLF electromagnetic waves (0,1—200 Hz) with the earth’s crust and ionosphere in the field of industrial power transmission lines (experiment «FENICS»). Geofizicheskie protsesy i biosfera, 14(2), 5—49 (in Russian).

Zhamaletdinov, A. A., Shevtsov, A. N., Korotkova, T. G., Efimov, B. V., Barannik, B. G., Kolobov, V. V., Prokopchuk, P. I., Kopytenko, Yu. A., Ismagilov, V. S., & Pesin, L. B. (2007). Deep sounding with industrial powerlinesin combination with MTS (CSMT). Fizika Zemli, (3), 74—80 (in Russian).

Zhamaletdinov, А. А., Shevtsov, A. N., Korotkova, T. G., Kopytenko, Yu. A., Ismagilov, V. S., Efimov, B. V., Barannik, M., Kolobov, V. V., Prokopchuk, P. I., Smirnov, M. Yu., Vagin, S. A., Pertel, M. I., Tereshchenko, E. D., Vasiliev, A. N., Gokhberg, M. B., & Korya, T. (2009). International experiment FENICS on tensor frequency electromagnetic sounding of the lithosphere in the eastern part of the Baltic (Fennoscandian) shield. Doklady AN, 427(3), 388—393 (in Russian).

Zhamaletdinov, А. А.,Shevtsov, A. N., Korotkova, T. G., Kopytenko, Yu. A., Ismagilov, V. S., Petrishchev, M. S., Efimov, B. V., Barannik, M. B., Kolobov, V. V., Prokopchuk, P. I., Smirnov, M. Yu., Vagin, S. A., Pertel, M. I., Tereshchenko, E. D., Vasiliev, A. N., Grigoriev, V. F., Gokhberg, M. B., Trofimchik, V. I., Yampolsky, Yu. M., Koloskov, A. V., Fedorov, A. V., & Korya, T. (2011). Deep electromagnetic sounding of the lithosphere of the eastern part of the Baltic (Fennoscandian) shield in the field of powerful controlled sources and industrial transmission lines (Fenics experiment). Fizika Zemli, (1), 4—26 (in Russian).

Zhamaletdinov, А. А., Shevtsov, A. N., Toka¬rev, A. N., Kononov, Yu. M., & Vanyan, L. L. (1999). Influence of the ionosphere and displacement currents on the results of deep electromagnetic sounding in the field of an ELF antenna. Doklady AN, 366 (5), 688—691 (in Russian).

Rokityansky, I. I. (2012). Notes on geoelectrics. Geofizicheskiy Zhurnal, 34(4), 235—244. https://doi.org/10.24028/ gzh.0203-3100.v34i4. 2012.116777 (in Russian).

Rokityansky, I. I. (1981). Induction sounding of the Earth. Kiev: Naukova Dumka, 296 p. (in Russian).

Rokityansky, I. I. (1975). Investigation of electrical conductivity anomalies by the method of magnetovariational profiling. Kiev: Naukova Dumka, 296 p. (in Russian).

Rokityansky, I. I. (1970). Investigation of deep electrical conductivity. Geofizicheskiy sbornik AN USSR, (38), 102—106 (in Russian).

Saraev, A. K., & Kostkin, P. M. (1998). The structure of the electromagnetic field of an ELF radio installation. Voprosy geofiziki, (35), 117—135 (in Russian).

Tikhonov, A. N. (1943). On the stability of inverse problems. Doklady AN SSSR, 39, 195—198 (in Russian).

Backus, G., & Gilbert, F. (1967). Numerical applications of a formalism for geophysical inverse problem. Geophysical Journal International, 13(1-3), 247—276. https://doi.org/10.1111/j.1365-246X.1967.tb02159.x.

Backus, G., & Gilbert, F. (1970). Uniqueness in the inversion of inaccurate gross Earth data. Philosophical Transactions of the Royal Society A, 266, 123—192. https://doi.org/10.1098/rsta.1970.0005.

Parker, R. L. (1972). Inverse theory with grossly inadequate data. Geophysical Journal International, 29(2), 123—138. https://doi.org/10.1111/j.1365-246X.1972.tb02203.x.

Published

2021-11-24

How to Cite

Rokityansky, I. I. ., & Tereshyn, A. V. . (2021). Multiparameter approach in the deep geoelectrics. Geofizicheskiy Zhurnal, 43(5), 193–207. https://doi.org/10.24028/gzh.v43i5.244081

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