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Atlas zasobów geotermalnych formacji paleozoicznej na Niżu Polskim — Atlas of geothermal resources of Paleozoic formations in the Polish Lowlands
Research projects carried on at the Department of Fossil Fuels, Faculty of Geology, Geophysics and Environment Protection of the AGH-University of Science and Technology in Kraków enabled the recognition of geothermal potential accumulated in the Paleozoic aquifers (from Cambrian toPermian). In the Polish Lowlands the Paleozoic formations are included into the two principal structural units: the Precambrian Platform in the north and the east, and the Paleozoic Platform in the west and the south. Both units are separated by the Tornquist-Teisseyre Zone which is a trans-European suture. In the area of Precambrian Platform both the heat flow and the geothermal gradient values are low but in the area of Paleozoic Platform much higher values of these parameters were measured. In the whole area of the Polish Lowlands the heat flow values change from 35 to 85 mW/m . Consequently, geothemal gradients and groundwater temperatures also vary inwide range, which influences the possibilities of commercial utilization of geothermal energy. Recognition of geothermal conditions in the Paleozoic aquifers is an important contribution to our knowledge on domestic energy resources in the Polish Lowlands. Geothermal waters and energy accumulated in the Paleozoic formations can be utilized for balneological and recreational purposes, particularly in the areas distant from the hot groundwater reservoirs. Generally, the analyzed Cambrian, Devonian, Carboniferous and Lower Permian reservoir complexes reveal high TDS values and unfavourable reservoir parameters, which results in rather lowpotential discharges of wells. However, in some wells drilled to Paleozoic formations the rocks of high and very high reservoir parameters, high potential discharges, high temperatures and relatively low TDS values were locally encountered. Unfortunately, the regional-scale recognition of Paleozoic reservoirs is still insufficient and requires the newexploration drillings. The chapters written in Polish and English versions were illustrated with figures whereas the successively described aquifers were supplemented with appendices (maps and cross-sections). The Authors are indebted to the Halliburton Company for kind permission granted to the Staff of the Department of Fossil Fuels at the AGH-University of Science and Technology for the usage of specialized software developed by the Landmark Graphics Co. for multilayer analysis of principal hydrogeothermal parameters and for calculations (Grant no.2006-COM-038833). The Authors are grateful to the Ministry of Environment and to the National Fund for Environmental Protection andWater Management for providing funds necessary to undertake the editions of the Atlases. Sincere thanks are due to the Staff of theDepartment of Geology at the Ministry of Environment for continuous and friendly support of our studies. The Authors are very much indebted to the members of the Commission of Hydrogeological Assessments, particularly to Professor Bronisław Paczyński, President of the Commission and to Ms. Teresa Stachowiak as well as to Mr. Jacek Kapuściński, the reviewer of the Atlas for important remarks and opinions,which improved the value of the Atlases. Out cordial thanks are expressed to Ms. Halina Sobkowska, emeritus expert of the past Committee for Scientific Research, for many years of her deep involvement in realization of geothermal research projects in Poland.