Geofizyczne oraz hydrogeologiczne warunki pozyskiwania energii geotermicznej w Polsce

In result of drilling works carried out for over the past several decades in Poland, over 7,500 boreholes were completed to depths exceeding 1,000 m. The works were mainly connected with exploration for oil and gas and, therefore, the range and quality of the bulk of the obtained borehole data appear to be of very limited value and often even misleading in analyzing geothermal potential. This makes Polish Geological Institute’s exploratory boreholes especially important for geothermal studies thanks to their relatively regular distribution, large cored intervals and numerous hydrogeological and petrophysical tests and analyses. The Polish Geological Institute has been conducting long-term systematic studies aimed at obtaining uniform and the most detailed knowledge of environmental factors determining possibilities to use geothermal energy in Poland. Generation and compilation of uniform map of heat flow density in the area of Poland including southern Baltic Sea have been completed in 2009. The paper presents newly completed map of undisturbed temperature at the depth of 2,000 m for that area. This map along with the above mentioned uniform map of heat flow density provide important indices for evaluating perspectives of obtaining geothermal energy. The paper also presents hitherto obtained results of determinations of hydrogeological parameters of deep aquifers mainly extending throughout the Polish Lowlands.