Submarine Hydrogeological Structures and Groundwater of the Sea of Okhotsk Region

Based on the results of multi-year regional geological and geophysical studies, oil exploration and hydrogeological research of the sea and ocean bottom, the submarine hydrogeological structures of the Sea of Okhotsk region including hydrogeological massifs, artesian and volcanogenic basins are characterized. The hydrogeological stratification of the geological cross-section is performed, according to which five Cenozoic aquifer systems are distinguished in the artesian basins. Specific features of the chemical composition of submarine groundwaters are characterized, whose mineralization decreases with depth from 27-30 /dm(3) to 14-20 g/dm(3). Gases (mainly methane) and thermal waters that form the ore bodies of metallic sulfides and nonore minerals are discharged into the sea bottom waters along tectonic fault zones.