The importance of the deep factors in the formation of oil-and-gas deposits is recognized by most. researchers, regardless of their views on the origin of hydrocarbons: brganic or inorganic. The spatial relationship between the oil-andgas areas and deep faults, weakness zones in the Earth's crust, heat flow anomalies can be considered as established fact. A large amount of electromagnetic soundings in the Far East of Russia, in the transition zone from continent to marginal seas where several large industrial oil-and-gas bearing basins are located, has revealed the geoelectric criteria prediction of oil-and-gas presence, taking into account the fluid regime of deep horizons of the crust and lithosphere. In addition, as revealed in recent years, the concentration of oil-and-gas deposits is controlled by zones of anomalous conductivity in the crust and subcrustal lithosphere. Detection of such zones using electromagnetic soundings, tracking them over large areas. the study of relations with the structural plan, tectonics, material constitution contributes to a more efficient prediction and conducting oil and gas exploration. Such an approach may be useful in studying the resources of the EastVietnam Sea, characterized by the fact that the patterns of distribution of hydrocarbon deposits have specifics, significantly different from the. classical ones.