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The results presented in this thesis project represent the first attempt for regional evaluation of geothermal resources of the Paraná Basin. The works carried out include reevaluation of the results of previous investigations as well as new complementary geothermal measurements in the states of São Paulo, Paraná, Santa Catarina, Goiás and Minas Gerais. The results indicate that the geothermal gradients in the sedimentary basin areas in the range of 16 to 46 °C/km with a mean value of 24 ± 4 °C/km. The heat flow values are in the range of 40 to 100 mW/m with a mean of 67 ± 6 mW/m. The regional distributions of geothermal gradients and heat flow did not reveal the presence of any significant positive thermal anomaly in the central parts of the basin. It implies that thermo-tectonic processes associated with basin formation operated at relatively shallow depths and consequently have left very little residual heat in the crustal layers. Nevertheless, it has been possible to identify three distinct orthogonal belts of relatively high heat flow. The first and most prominent one is situated in the north-western parts of the basin, almost coincident with the southwest – northeast trending Brasiliano Lineament and the Paraguay – Araguaia structural belt. The second one, that is relatively less prominent, cuts across the central parts of the basin, and is almost coincident with the southeast – northwest trending belt of dike swarms of the Ponta Grossa arch. The third one is located in the southwestern border of the basin, with orientation similar to that of the first one. The presence of these orthogonal belts has been interpreted as indicative of a deep seated crustal spreading center, similar in character to those of the current mid-ocean ridge systems. The geothermal resource base of the Paraná Basin has been estimated to be of the order of 8x10 J. The recoverable parts of the resources are associated with two confined aquifer systems: Guarani and Furnas Ponta Grossa. The first one of low enthalpy type is located at depths of 1 to 3 km, while the second one of medium enthalpy type is located at depths of 3 to 5 km in the central parts of the basin. The low enthalpy resources are suitable for direct use applications in agro-industrial processes, while the medium enthalpy resources open up possibilities for electrical power generation in the southern and south-eastern parts of Brazil. Avaliação de Recursos Geotermais da Bacia do Paraná VI

Avaliação de recursos geotermais da Bacia do Paraná