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9th International Congress of the Brazilian Geophysical Society
- Conference date: 11 Sep 2005 - 14 Sep 2005
- Location: Salvador, Bahia, Brazil
- Published: 11 September 2005
81 - 100 of 462 results
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Métodos Elétrico e Eletromagnético Aplicados ao Delineamento de Zonas Contaminadas por Resíduos de um Curtume
Authors F. Huber, S.J. da Silva Fachin, S. Shiraiwa and W.R. BorgesThis work presents some results obtained with the Ground Penetrating Radar (GPR), electric and inductive electromagnetic (EM34) methods applied to determinate and localize areas of potentially contamination with industrial waste of a tanning industry. The area is located in city of Várzea Grande, Mato Grosso state, and actually abandoned.
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Reconhecimento de solos por meio de gamaespectrometria
Authors C.T.C. Nascimento, E.M. Guimarães and A.C.B. PiresThe purpose of this work is to present a procedure for survey of soils, based on gamma-ray spectrometry. The study area has 5 km2 and is located at Jardim Botânico de Brasília, an environmental protection area. Gammaray spectrometry survey was carried out in this area, in September 2000.
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Projeto aerogeofísico São Timóteo (província uranífera de Lagoa Real – Ba): grandezas dosimétricas e estimativa das concentrações de U e Th.
Authors E.F.S. Santos, F.F.L. Simões Filho and J.M. FlexorUranium and thorium concentrations (ppm eU and ppm eTh) obtained from the gamma-ray spectrometry airborne survey of the São Timóteo Project (uraniferous province of Lagoa Real - Bahia, Brazil, CNEN, 1979) has been compared with terrestrial data concentrations measured by the "Environmental Monitoring Program (EMP)" carried out during the years 1998-2003 in the same area.
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Análise da Velocidade Média dos Ventos na Região do Observatório Espacial do Sul: estudo preliminar
Authors M.P. Pes, L.A. Biazi, M. Guedes, S.L. Mantelli Neto, R.A. Guarnieri, E.B. Pereira and N.J. SchuchThe economy growth in developing countries, like Brazil, is related to the increase in energy demand. The use of fossil fuels should be avoided because it elevates the CO2 emission rates to the atmosphere. Besides, such resources are limited and they don't contribute to a sustained development. Therefore, the most promising scenario should contemplate the use of clean and renewable energies.
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Mapeamento geológico das rochas encaixantes às ocorrências de veios de quartzo aurífero da Seqüência Campestre, por meio da avaliação estatística de dados aerogeofísicos (gamaespectrometria) na Região de São Sepé, RS, Brasil
Authors M. de Souza Soares, J.C. Koppe, J.F.C. Leite Costa and S.B. Alves RolimDe acordo com o IAEA (2003), a gamaespectrometria é amplamente utilizada no mapeamento geológico, na pesquisa de solos, na exploração mineral e nos estudos de regolitos. Seu uso, como mapeamento, requer um entendimento da geoquímica dos radioelementos nas rochas e nos solos bem como dos processos que afetam sua distribuição e mobilidade. No primeiro momento, deve ser feito um mapeamento das unidades litológicas principais para então, realçar padrões de radioelementos dentro das unidades individuais. Adicionalmente, estudos geoquímicos, petrológicos e mineralógicos das rochas e solos podem corroborar com a interpretação dos estudos gamaespectrométricos da área em estudo.
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A multi-azimuth VSP experiment for fracture orientation detection in HMD field Algeria
Authors F. Chegrouche and F. BabaiaNatural micro-fractures are very important in the control of production in the hydrocarbon reservoirs. The presence of the vertical fractures in the rock mass causes the split of the incident shear wave into two approximately orthogonal components with different velocities. Shear wave splitting analysis permits the estimation of fracture orientation.
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Análise cinemática da Falha de Baixa Grande a partir de dados de sísmica de reflexão 3D, fase rifte da Bacia Potiguar, nordeste do Brasil
Authors R.M. Pontes and R.M.D. de MatosIn spite of significant study and exploration of the Potiguar
Basin, easternmost Brazilian equatorial margin, by the oil
industry, its still provides an interesting discussion about
its origin and the mechanisms of hydrocarbon trapping.
The mapping and interpretation of 3D seismic data, rift
phase of the basin, suggests that dip changes in the
Baixa Grande Fault plane are responsible for generating
regional synclinal folds, which provides powerful
information about its kinematics.
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Geração de mapas litogeofísicos como instrumento para a cartografia geológica: o exemplo do Cinturão Mineiro, MG
Authors J.C. Ferreira Uchoa, A.M. Silva and C.L. Benfica ToledoThe Mineiro Belt (MB) in the southern portion of the São Francisco Craton (SFC), Minas Gerais, Brazil, is a important Paleoproterozoic segment and shows plutonic, volcanic and sedimentary rocks, of Archean to Mesoproterozoic age, reworked by later thermo-tectonic events.
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Realce e Interpretação de dados aerogeofísicos como ferramenta para o mapeamento geológico em regiões intemperizadas: o caso da Serra de Cláudio, Porção Sul do Cráton São Francisco, M.G.
Authors A.C. Ruy, A.M. Silva and C.L. Benfica ToledoThis paper presents an integrated approach to geological mapping by the use of high-resolution airborne geophysical data and geological information in weathered regions. Innovations in the data processing allowed the elaboration of several products, applied on spatial evaluation of geological units and structural lineaments.
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A Expressão Magnética do Enxame de Diques nas regiões de Itapecerica e Cláudio e sua correlação com o magmatismo fissural do Quadrilátero Ferrífero e Espinhaço Meridional, MG
Authors E. Zacchi, A.C. Ruy, A.M. Silva and C.L. Benfica ToledoThe present paper intends to study the expression of mafic dyke swarms situated in southern portion of the São Francisco Craton (SFC). Our main purpose is the characterization of basic rock formation pulses that occur in this region, through aeromagnetic data and field relations. We mapped the magnetic expression of these bodies, mainly to understand their importance and correlation with the main geological unities.
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A expressão magnética e gamaespectrométrica das anomalias elípticas da região de Itapecerica, MG
Authors E. Zacchi, A.M. Silva and C.L. Benfica ToledoThe southern portion of the São Francisco Craton (SFC), Minas Gerais, Brazil, including rocks ranging from the early Archean up to the late Neoproterozoic. However, the lack of rock exposures and connections among rock formations at surface poses problems for regional geologic mapping and interpretation. In this paper, an attempt was made to map three elliptical anomalies in the southernmost part of the SFC, using aerogeophysical (magnetics and gamma ray) data, with the aim to understanding both regional rock domains and structure.
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3D Seismic Interpretation of the Praia Grande Impact Structure – Upper Cretaceous of Santos Basin, Offshore Brazil
Authors G.A. Correia, J.R. Corrêa de Menezes, G.V. Bueno and E.J.J. MarquesThis work presents the Praia Grande impact structure, located in the Santos Basin, approximately 200 km southeast from the coastline of São Paulo State, Brazil. The identification of this structure is based on the interpretation of three-dimensional seismic data, acquired and processed in 2004 for petroleum exploration in a Petrobras concession block in the Santos Basin.
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Análise geofísica-geológica da porção emersa da Bacia de Campos através de uma metodologia integrada - resultados finais
Authors G.F.S. Pavie and A.A.G. CarrasquillaThis work consists in the interpretation of geophysical data of the continental portion of Campos Basin. A crust model of this region was constructed based in gravity, magnetic and magnetotelluric data interpretation, which was correlated with existent geological information. In this form, these results permitted us the visualization of the continuous transference zones on the continental portion of Campos Basin, which were enhanced by the map analysis. On the other hand, with the modelled physical
properties, several maps were generated and geology associations were proposed. Finally, a three-dimensional visualization of mantle and basement surface, as a product of the modelling, provided us with a better understanding of the structural framework of this part of the basin, including the morphology of the bedrock and the thickness of sedimentary deposits.
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Gênese e contribuições da tectônica diastrófica e da deformação adiastrófica na migração e acumulação de hidrocarbonetos na Bacia de Jequitinhonha, Sul do Estado da Bahia
Authors A.F. de Brito and M.K. KaramBased on seismic data interpretation three differents stages of faulting could be observed in the Jequitinhonha Basin. The first stage, diastrophic, was related with rift origin and is represented by normal faults and horst and graben structures. The second stage was associated with late tectonic reativation of rift faults and was the trigger for the first halokinesis movement, causing the faulting and folding of the carbonate rocks from Barra Nova Group.
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Utilização da técnica de raio imagem na conversão em profundidade para melhorar o posicionamento de falhas
Authors G. Waisman and J.N. HounieThe correct imaging of subsurface layers, as others structural features, like faults, is one of the main challenges of the seismic method. This problem becomes more critical when an extension or a development program is taking place in highly faulted and tilted
reservoirs. In the studied area these characteristics are presents, due to the intense salt tectonics.
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Evidências sísmicas de zonas de colapso na porção basal da seqüência carbonática do Albiano da Bacia de Santos. Um modelo genético
More LessAnomalous seismic features in the lowest portion of the Albian carbonate sequence (Guaruja Fm.) of the Santos basin are identified and characterized by using of post stack seismic attributes (RMS amplitude, coherency) and analysis of the high frequency seismic volume.
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Integração de métodos geofísicos na caracterização de um limite entre as Bacias de Sergipe-Alagoas e Jacuípe
By R.C. CampeloThe present paper discusses the existence of a geological limit between Sergipe-Alagoas and Jacuípe Basins. Potencial field data and seismic reflection data are integrated to provide a larger understanding about the area. From the structural point of view, the Vaza-Barris System Fault (VBSF) seems to be the only candidate, since there is no other structure of the same trend and weigth in the area that could be suggested as a limit
between these basins.
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Processamento e interpretação de dados gamaespectrométricos aéreos do projeto Itabira-Ferros, MG
The area covered by the Itabira-Ferros Project is located in the State of Minas Gerais Iron Quadrangle and is known for its emerald occurrences and deposits.
The present study apply geophysical characteristics, using airborne gamma-ray spectrometric data and their integration with geology, to determine probable zones of emerald mineralization.
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Processamento e interpretação dos dados magnetrométricos aéreos do projeto Itabira-Ferros, MG
The area covered by the Itabira-Ferros Project is located in the State of Minas Gerais Iron Quadrangle and is known for its emerald occurrences and deposits.
The area is characterized by green stone belts (Guanhães Complex and Rio das Velhas Supergroup) and paleoproterozoic iron sequences belonging to Minas Series, inserted in granitic bodies (Granite Borrachudos). The development of emerald deposits is attributed to the interaction of pegmatitic fluids with mafic-ultramafic rocks of Rio das Velhas Supergroup.
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3D SRME Practice for Better Imaging
Authors D. Lin, J. Young, W.-J. Lin, M. Griffiths and M. HartmannProper parameter selection is key to the success of 3D SRME. The major parameters include surface grid size and crossline aperture. We show that SRME crossline gathers can be used to determine both parameters. We also use a data example from Gulf of Mexico (GOM) to demonstrate the benefits of 3D SRME.
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