Purpose. Construction of three-dimensional geoelectric model of the Zmiyniy Island and the nearby waters of the northern Black Sea shelf. Methods. Methodology. The methodology of research is directly linked to the procedure of the three-dimensional geoelectric model construction. It involves the selection of the spatial parameters of the model and its cells, and the model is built against the background of the "normal" one-dimensional geoelectric section in this area. Repeated changes in the parameters in accordance with the observed data and the recalculation of model make it possible to achieve the required similarity. Results. In August of 2012 on the Zmiyniy Island were carried out MT sounding. Field data were processed by software package PRC_MTMV [Varentsov. et. al., 1997; Varentsov, Sokolova, 2000], as well as program PTS [Ladanivsky, 2003; Semenov, 1985]. On this base one-dimensional inversion was made. According to its results, a sharp reduction in the calculated resistivity is at depths ranging from 10 km to 45 km, where they reach a minimum, then there is an increasing in resistivity to depths of 100-120 km. This feature indicates the presence at these depths the powerful conductor of telluric current. According to the preliminary modeling obtained a zone of high conductivity at the depths of 20 to 100 km with an electrical resistivity of 25 Ohm*m. It is suggested that changes in the electrical parameters of the Earth's crust and upper mantle caused by the redistribution of deep fluids. Originality. The MTS studies on the Zmiyniy Island and processing using two software packages were made, as well as an inversion of the MTS data. The preliminary three-dimensional geoelectric model the Zmiyniy Island and adjacent horst uplifts was built. Practical significance. According to the results of this study the deep structure of the investigated region and its electrical conductivity, which displays the structural-tectonic features of the territory, can be studied. Furthermore, conductivity anomalies associates with the activation of the fluid and degassing processes of the Earth.
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