Geothermal potential of Portuguese granitic rock masses: lessons learned from deep boreholes

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• 作者：L. M. Ferreira Gomes ; J. Ferreira Guedes…
• 关键词：Temperature ; Geothermal gradient ; Sulphurous groundwater ; Fissured aquifer ; Granitic massifs ; Geothermal reservoir
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：73
• 期：6
• 页码：2963-2979
• 全文大小：3,234 KB
• 参考文献：1. Arnórsson, S (1983) Chemical equilibria in Icelandic geothermal systems. Implications for chemical geothermometry investigations. Geothermics 12: pp. 119-128 CrossRef
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  5. CEC (1988) Atlas of geothermal resources in the Eropean Community, Austria and Switzerland. Commission of the European Communities/D. G. for Science, Research and Development. Bruxelas/Estrasburgo, p 74 and 110 maps
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  8. DGEG (2013) Aproveitamento geotérmico em Portugal a partir dos recursos geotérmicos. Dire??o-Geral de Energia e Geologia. site: http://www.dgeg.pt/ visitado em Outubro de 2013
  9. Dias G, Noronha F, Almeida A, Sim?es PP, Martins HCB, Ferreira N (2010) Geocrhronology and petrogenesis of late-Variscan Plutonism (NW Portugal): synthesis and inferences on crustal recycling and growth in the Central, Iberian Zone. Ciências Geológicas—Ensino e Investiga??o e sua História-010, pp143-60 (in portuguese)
  10. Ferreira Gomes LM (1999) Revis?o do plano de explora??o—Furo AC1, Termas de S?o Pedro do Sul. Furo AC1, C. M. de S. Pedro do Sul; UBI, Covilh?, p 25 (unheard internal report, in portuguese)
  11. Ferreira Gomes LM (2001) Estudo hidrogeológico para enquadramento legal das Termas de Longroiva, C. M. Meda; UBI, Covilh?, p 47 (unheard internal report, in portuguese)
  12. Ferreira Gomes LM (2004) Memória Justificativa e Ante-Projecto de uma Sondagem de Pesquisa de água Mineral para Aproveitamentos Geotérmicos em Cascata. Termas de Unhais da Serra. Covilh?. C.M.C. UBI. 2004, p 20 (unheard internal report, in portuguese)
  13. Ferreira Gomes LM (2006) Revis?o do plano de explora??o das Termas do Carvalhal. Furo AC-G1, C. M. Castro Daire, UBI, Covilh?, p 53 (unheard internal report, in portuguese)
  14. Ferreira Gomes LM (2009) Estudo hidrogeológico para atribui??o directa de concess?o como água mineral em actividade termal. Furo AM4. Termas da Fonte Santa de águas—Penamacor. C. M. Penamacor. UBI, Covilh?, p 54 (unheard internal report, in portuguese)
  15. Ferreira Gomes LM, Gomes da Costa TC, Plácido EP, Almeida MNP (2006) Estudos hidrogeoambientais com objectivo a uma nova Unidade Termal em Santa Comba D?o. 80 Cong. da água. APRH, Figueira da Foz. Resumos de Comunica??es, pp 181-83; paper no 177, p 16 (in portuguese)
  16. Ferreira Gomes LM, Andrade Pais L, Mendes E (2007) Contribution for the knowledge of the fracturing and hydraulic characterization of the granitic pluton of Castro Daire region—Viseu (Portugal), vol 1. In: e Sousa LR, Olalla C, Grossmann N (eds) 11th Cong. of the ISRM, Taylor y Francis Group, London, pp 207-10
  17. Ferreira Gomes LM, Quintela Viriato MA, Mendes M (2010) The new well to obtain hot water and the drilling problems in very fractured granitic massif in Unhais da Serra Spa—Portugal. In: Proceedings World Geothermal Congress 2010, Bali
  18. Ferreira Guedes J (2005) Relatório Final da Execu??o de furo termal nas Termas do Carvalhal (AC-G1), Camara Municipal de Castro Daire; Agosto, A. Cavaco (unheard internal report, in portuguese)
  19. Ferreira Guedes J (2010) Relatório Final da Execu??o de um furo de capta??o profundo (AQ1), em Fonte Santa—Almeida, Camara Municipal de Almeida; Junho, Aqualis, p 20 (unheard internal report, in portuguese)
  20. Ferreira Morais MJ (2013) Sistemas hidrominerais nos terrenos graníticos da zona Centro-Ibérica em Portugal Central:perspectivas químicas, isotópicas e genéticas sobre as águas sulfúreas. PhD Thesis. Univ. d
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

The northern part of Portugal is made of granitic large outcrops where a huge number of thermal sulphurous water springs can be found, located in the surroundings of extensive fracture systems. Most of these springs are used for Medical Spa purposes. Except for a limited number of cases, important parts of the heat water content are continuously wasted. In the last decades, a considerable number of Medical Spa abstractions have been improved by deepening wells which, in most situations, is accomplished by water temperature increase. Based on the well temperature records, to around 1,000?m borehole depths, the authors were able to calculate the geothermal gradients for six hydrothermal areas with values from 0.0122 to 0.0762?°C/m. Taking into consideration the reservoir temperature inferred by chemical geothermometers and the geothermal gradients, the reservoir depth was estimated in the range of 1,241-,244?m. The higher depth estimation might be overestimated by not including convection heat transport processes. Based on the minimum reservoir depth estimation, none of the wells reached the reservoir, thus precluding higher flow rate figures. The data obtained in this study along with the described drilling operations can guide and improve future drilling operations in those areas with regard to time and money.