Hydrocarbon and wastewater contamination of land and groundwater in the vicinity of refineries, fuel depots, oil fields and even pipelines is one of the biggest environmental protection problems. The localization and determination of the spatio-temporal distribution of contamination is currently based exclusively on the use of direct biochemical analysis methods of soil samples and water taken from the surface or from boreholes. The information thus obtained is punctual and, for this reason, cannot provide an overall picture of the contamination of the land and, in particular, of the groundwater. The integration of punctual information into a three-dimensional spatio-temporal image of areas contaminated with hydrocarbons and wastewater becomes possible through the appropriate use of geophysical and hydrogeophysical methods. The main purpose of the project is to carry out a geophysical research program for the spatio-temporal monitoring of contamination with hydrocarbons and/or wastewater, resulting from the refining, storage and transport activities of petroleum products in the vicinity of the Petromidia refinery, and in the Port Constanta – Oil Terminal area, respectively. The implementation of this program requires the simultaneous performance of highly detailed hydrogeological and geophysical investigations at different time periods (time-lapse investigations), both in areas with high potential for contamination with oil and wastewater, as well as in the uncontaminated areas. The program will allow the implementation of a specific geophysical investigation strategy in accordance with the nature of the pollutants, the nature of the pollution source and the local hydrogeological conditions. It will also be used in the observation, prevention and spatio-temporal assessment of pollutant plumes in the area of refineries and oil depots.