p. 215 - 225 MODIFICATIONS DES PARAMETRES PHYSICO-CHIMIQUES DE L'EAU MARINE, PRODUITES A LA SUITE DU MELANGE AVEC DE FLUIDES DE FORAGE O. Serbanescu et V. Piescu Institut Roumain de Recherches Marines Constantza Abstract The authors have studied the modifications of some physical and chemical parameters of sea water (pH, colour, density, suspended materials, BOD, organic substance, nitrates, Fe+++, oil products) under the influence of 4 drilling fluids. Changes was observed especially on pH, organic substance content, phosphates, nitrates and BOD.