Calculations have shown that injecting of seawater in the reservoir and its mixing with underground water does not provoke precipitation of calcite and/or gypsum, at any mix proportions. Those mixtures of reservoir and sea waters are saturated in barium sulfate and strontium carbonate, but their precipitation is however unlikely in polysalt brine systems. In the case of their improbable deposition, a scaling inhibitor should be easily used. The water treatment scheme includes the heating of Pechora sea water before its injection into reservoir. Decay of the seawater calcium bicarbonate with precipitation of CaCO 3 is possible under heating. In general, the water treatment technology of injection is actually elaborated as for the Pechora sea water so for the produced bed water.
Seismological studies using the earthquake exchange wave method (EEWM) with registration and interpretation not only of earthquakes but also of explosions at different epicentral distances have been carried out on the Baltic Shield since the early 1960s.
The zone of juxtaposition of the southeastern part of the Baltic Shield and the Russian Plate covers the territory of southern Finland, southern Karelia and the Baltic States. To date, a significant amount of deep seismic research has been carried out here on several northeast-directed profiles.
