GEOELECTRICAL MODEL OF THE EARTH’S CRUST ALONG THE SHU-SARYSU GEOTRAVERSE ACCORDING TO MAGNETOTELLURIC SOUNDINGS

Геоелектрична модель земної кори вздовж геотраверсу Шу-Сарису за даними магнітотелуричного зондування
Tleubergenova A. Umirova G. Karpenko O. Maussymbayeva A.
2023 Natsionalnyi Hirnychyi Universytet

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu
2023 Issue 3 5 - 10 pp.

Purpose. To study and assess the possibility of effective application of electrical prospecting by magnetotelluric sounding (MTsounding) and to determine the range of geological problems to be solved in the geoelectric conditions of the ShuSarysu geotraverse. Methodology. The issues of methodology of modern technologies of field observations, peculiarities of processing and interpretation of MTsounding data are considered, which showed that modern instrumental and methodical electrical survey technologies of MTsounding allow obtaining results of field measurements of increased reliability, due to their accuracy, productivity, mobility, noise immunity, level of automation. To identify the main features of the geoelectric structure of the Earth’s crust and the upper mantle, the modern technique of interpreting MT data allows for 1, 2D inversion of the effective curves of apparent resistivity and impedance phase. Findings. Based on MTsounding data, a geoelectric section of the ShuSarysu geotraverse was constructed, characterizing the position and morphology of five geoelectric boundaries in the crustal section in the 0–40 km depth interval. The identified five geoelectric horizons show good coincidence with the conventional seismic horizons and confidently correlate with the geological references established by GIS data. Originality. On the basis of MTsounding studies, the geological interpretation of the structure of suprasalt and subsalt structuralformation complexes is presented; the geological efficiency of MTsounding electrical prospecting in revealing the complex structures in the conditions of the ShuSarysu geotraverse is shown. On the basis of model constructions of the geoelectric section, new data on the deep geological structure of the ShuSarysu geotraverse were obtained: new data on the structure of Mesozoic terrigenoussedimentary rock complexes and the Paleozoic part of the section with the allocation of the supposed faults; on the basis of MTsounding results, recommendations for further detailed geological exploration work were given. Practical value. A comprehensive interpretation is recommended of the obtained MTsounding data together with the results of geological and geophysical research on the regional profile in order to establish search criteria for the discovery of mineral deposits and the prospects of gas content in the area.

basement , geoelectric section , geotraverse , magnetotelluric sounding , sedimentary cover , Shu-Sarysu sedimentary basin

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Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan
Kazakh National Research Technical University, Almaty, Kazakhstan
Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

Abylkas Saginov Karaganda Technical University
Kazakh National Research Technical University
Taras Shevchenko National University of Kyiv

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