Geotermometria das águas hipertermais do Sistema Aquífero Guarani no estado de São Paulo

Página do item simplificado
dc.contributor.authorGastmans, Didier [UNESP]
dc.contributor.authorReis, Marcelo Martins [UNESP]
dc.contributor.authorKiang, Chang Hung [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:27:22Z
dc.date.available2014-05-27T11:27:22Z
dc.date.issued2012-12-01
dc.description.abstractSeveral geothermometers have been employed to determine the expected temperature in the groundwater reservoirs, most part of them based on the chemical equilibrium between thermal groundwaters and minerals which constitute the aquifer framework. Based on this principle, groundwater from Guarani Aquifer System, which presents temperatures upon to 38°C, classified as hyperthermal by the Brazilian Mineral Water Code, had their chemical composition evaluated with the main purpose to determine the expected temperatures in the reservoir based on the application of several geothermometers. These groundwaters can be classified as Na-HCO3 type evolving to Na-HCO3-Cl-SO4 type due the increase in sulphate and chloride concentrations. Measured groundwater temperatures show a good correlation with the depth of the aquifer, indicating an average geothermal gradient of 27.7°C/km. The lowest geothermal gradients, bellow 25°C/km, are observed in the central portion of the study area; meanwhile the highest gradients are observed in NE and W portions of the study area. Quartz equilibrium based geothermometers return temperature over the measured temperatures, meanwhile chalcedony geothermometer returns temperatures near the measured in the wells, except for the wells located in the area which presents the lowest geothermal gradients. The geothermometers based on the equilibrium between Na/K have returned temperatures diverse from the measured at the field, meanwhile the geothermometer based on the equilibrium between Na/K/Ca has presented good match with groundwater which present temperatures under 50°C, due the thermodynamic equilibrium between these waters and feldspars. Geothermometers show evidences about mixtures between groundwaters from GAS and underlying units, especially in wells located in the SW portion of the study area.en
dc.description.affiliationUniversidade Estadual Paulista - UNESP, Rio Claro (SP)
dc.description.affiliationUnespUniversidade Estadual Paulista - UNESP, Rio Claro (SP)
dc.format.extent208-225
dc.identifierhttp://rbg.sbgeo.org.br/index.php/rbg/article/view/26019
dc.identifier.citationRevista Brasileira de Geociencias, v. 42, n. SUPPL.1, p. 208-225, 2012.
dc.identifier.file2-s2.0-84876928286.pdf
dc.identifier.issn0375-7536
dc.identifier.issn2177-4382
dc.identifier.lattes1989662459244838
dc.identifier.scopus2-s2.0-84876928286
dc.identifier.urihttp://hdl.handle.net/11449/73961
dc.language.isopor
dc.relation.ispartofRevista Brasileira de Geociencias
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectGeothermometers
dc.subjectGroundwater
dc.subjectGuarani Aquifer System
dc.subjectHydrochemistry
dc.titleGeotermometria das águas hipertermais do Sistema Aquífero Guarani no estado de São Paulopt
dc.title.alternativeGeothermometry of hyperthermal waters of Guarani Aquifer System of the state of São Paulo - Brazilen
dc.typeArtigo
dcterms.licensehttp://rbg.sbgeo.org.br/index.php/rbg/about/editorialPolicies#openAccessPolicy
unesp.author.lattes1989662459244838[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

Arquivos

Pacote Original
Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
2-s2.0-84876928286.pdf
Tamanho:
7.42 MB
Formato:
Adobe Portable Document Format
Baixar

Coleções

Artigos - Geologia Aplicada - IGCE