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Geoinformatika 2016; 3(59) : 69-75 (in Ukrainian)

Geoelectric study of engineering-geological condition of southwestern Kryvbas. Part 1. Physical and geological background

P.G. Pigulevskiy1,2, V.K. Svystun1, O.S. Kyryliuk3

1Dnepropetrovsk geophysical expedition “Dneprogeofizika” SGE “Ukrgeofizika”, 1 Geophysical Str., Dnepropetrovsk 49057, Ukraine, e-mail:dpge@ukr.net
2Institute of Geophysics, National Academy of Sciences of Ukraine, 32 Palladin Ave., Kyiv 03680, Ukraine, e-mail: pigulev@ua.fm
3Institute for Nature Management Problems and Ecology of NAS of Ukraine, 6 Moscovskaya Str., Dnepropetrovsk 49000, Ukraine, e-mail: ippe-main@svitonline.com

The purpose of the investigation is to analyze and generalize physical properties of rocks, geological and geophysical data. We based the study on the results obtained in the previous years. Data systematization permitted toselect geophysical methods for studying the geological conditions of the Kryvbas south-western part.
Method. The petrophysical, engineering and hydrogeological data analysis of the sedimentary rocks allowed to choose optimal geoelectric parameters for the vertical electrical sounding (VES) instrument. Calculations showed the optimal instrument, which is symmetrical installation AMNB with equipment ANC-3 with spacing AB length of 300 m long. The observation step is 200 m. We performed 33 crusades VES in the points near the previously drilled wells. This stage of the research was performed to compare electrical and geological parameters (geological strata boundaries and their bulk) under the qualitative and quantitative interpretation of VES and to study rocks anisotropy. Four years later the repeated linear VES were carried out on the main profiles. This study was conducted to determine the geoelectric rock parameters changes associated with the spatial-temporal changes in hydrogeological conditions of geological environment.
Results. The geological and geophysical sections of the first stage of our research were constructed as a result of VES electrical qualitative and quantitative interpretation. This data gave us information about the aquifer system structure and Neogene-Quaternary parameters of the sediments. In the second stage we used these sections as a basis of complex geophysical interpretation. The obtained results will be discussed in the second part of the paper.
The practical significance and conclusions. The proposed technology can rapidly detect and map the flooding zones by the geoelectric methods. The complex study is important in investigating the technosphere impact on the Kryvbas geological environment and in making environmental safety decisions.

Keywords: Krivoy Rog basin, electrical properties, flooding, vertical electrical sounding (VES), natural electric field.

The full text of papers

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