The protection of karst wells against the sea water intrusion has been often avoided due to the fear for such actions to be undertaken in the karst regions. However, in favorable hydrogeological conditions many wells of that sort have been reliably and economically protected in the artificial way against the salting sea water influence. The karst well "Morinj" is examined in this study, which geological, tectonic and hydrogeological conditions enable its protection against the salting sea influence to be reached by injection curtain. The sea well is located in the Kotor Bay (Bokokotorski zaliv), on the Montenegrin coast, along the southeast shore of the Adriatic sea. (Fig. 1) The salted well has capacity about 600 lit/sc, and is situated in the area that lacks the drinking water very much.
The river basin of the Morinje water-well is located in the karstified and high cretaceous limestones. They are stretching in the west-northwest direction and go all the way up to the edge of the Morinj Bay, not far from the seacoast. From the north side this good water- permeable area (K2,3) is limited with weakly water-permeable limestones with periodical layers of flint-stones (K3). From the south side this water-permeable area is limited by continuos, compressed, and weakly waterpermeable limestones with flint-stones. Behind them stretches a concordant area of non-permeable silificonized limestones (K¹). Accordingly, alongside the considered water-passing karstified area (K2,3) is limited by both blocks of weakly water-permeable, that is, water-nonpermeable rocks. The limestones are extended in zones from west to east, declining towards north. It was the shelly structure that caused an abnormal super position of layers where the wooden sediments extending along the reverse longitudinal clefts cover the eocenic flisch.