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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
101 - 120 of 462 results
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Estratigrafia sísmica de alta resolução no lago Juparanã, Linhares (ES) - Brasil
Authors R.S. Hatushika, C.L. Mello and C.G. SilvaThe high-resolution seismic stratigraphy into the Juparanã lake, on Espírito Santo state, Brazil, allowed the preliminary acknowledgement of the Quaternary sedimentation in Doce river lower course lake system. It was possible identify two seismic sequences limited by well defined stratigraphic surfaces. The older Quaternary eposits were attributed to arenaceous alluvial sediments, while that overlying deposits had been associated to tabular argillaceous sediments, formed in a lacustrine phase after the damming of the Juparanã lake.
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Influence of Caribbean tectonics across the Eastern Venezuela petroleum basins
Authors M.G. Castillo Vincentelli and H.D. EbertVenezuelan industrial oil exploration has been improving our knowledge of the petroleum systems in the septentrional region of the South American plate.
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Investigações Geofísicas nos Sambaquis Fluviais de Moraes (Miracatu-SP) e Estreito (Itaoca-SP)
Authors M.D. Watanabe, E.B. Rocha and A. RugenskiThis work presents results obtended with application of radiometric geophysical method on the Moraes and Estreito fluvial sambaqui (shellmound), both localizated in Ribeira de Iguape Valley, SP – Brazil.
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Aplicação dos Métodos de Empilhamento CMP e SRC na Seção 50-RL-90 da Bacia do Tacutu
Authors G. Garabito, J. Eiras, M.G. da Silva and M. PorsaniThe Takutu basin, located astride the Brazil-Guyana border, was explored in Brazil by PETROBRAS in the eighties, where was performed seismic surveys of refraction and reflection, and also was perforated two wells. With the development of modern seismic
processing techniques, there is the possibility of reprocessing the old seismic data with the objective to contribute for an improved evaluation of hydrocarbons potential of the Takutu basin.
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Tectonosseqüências da bacia de Taubaté: Uma interpretação Sismoestratigráfica
Authors L. Molinari and L. BorghiThe Taubaté basin is a Cenozoic basin located in the Southeastern part of Brazil, and its evolution has been associated to the process of the South Atlantic opening. Although many studies have been done in this basin several uncertainties remains. Most of the studies is about surface geology resulting in a lack of knowledge about subsurface environment.
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The Joaquim Tavora case study, Parana basin, Brazil : From live oil show to upside potential estimate in a frontier exploration basin
Authors E.M. Meister and C. Edwal VassãoOil exploration efforts in the huge Paleozoic Parana basin of Brazil waxed and waned since 1892 without a commercial discovery. The recent serendipitous find of live oil in a water well at a basin-flank position does demand explorationists´ attention, however. In the Joaquim Tavora area, surface geology, magnetotelluric and airmag surveys point to the existence of large, untested structural traps for the Devonian to Permian section present.
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Análise Quantitativa dos Efeitos Mecanicos de Rifteamento e Sedimentaçao da Bacia do Reconcavo
Authors D.F. Freitas and J.J.C. PalmaIn this study it was developed a tectonophysic modeling program to simulate the mechanical effects related to the rifting and sedimentary infilling of a rift-type basin along its evolution. The program is based on extension models of Kusznir & Egan (1990) and Weissel & Karner (1989).
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Atributos Sísmicos e Interpretação Volumétrica na Identificação de Corpos Carbonáticos na Bacia de Santos - Brasil
More LessSeismic attributes were used in the volumetric interpretation of carbonatic reservoirs in Santos Basin. As a result, it was possible to visualize, map and characterize a series of carbonate bodies, what was not possible in conventional seismic data. The parametrization for the attributes extraction is a very sensitive step in this process and can determine the success of the interpretation.
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A practical and integrated depth migration approach to prospect identification in BMES-11
Authors M. Rhodes, M. Frismanis and B. DalstrømStatoil took over operatorship of block BM-ES-11 in March 2004 with the objective of identifying new exploration prospects near and under salt bodies. An integrated geological and geophysical project was initiated to provide reliable data for prospect generation in the salt flank and sub-salt areas in the southern part of block BM-ES-11, c.f.
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Seismic and magnetic characterization of Varge˜ao Dome Astrobleme, Southern of Brazil
Authors C. Kazzuo-Vieira, A. Penteado Crósta, A. Moreira Silva, A. Schrank, F. Gamboa and M. TygelVarge˜ao Dome is one of the few examples of eroded impact craters (astroblemes) in the South America. This conspicuous circular depression, located at 26 490S and 52 100W, was formed by the collision of a meteorite against the Earth’s surface and has
a diameter of 12.4 km, depicting sharp topographic gradients of up to 150 meters between its outer borders and inner portions.
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Brasil MegaSurvey – A Regional Study of the Campos Basin
Authors H. Edwards, J. Magalhaes Macedo, L. Groves, N. Humpheys, T. Jarratt, A. Smith, C. Lopez and G.A. BattilaniIn the frontier, deepwater province of the Campos Basin, finding hydrocarbon resources proves challenging due to a poor understanding of the stratigraphy, subsurface structure and depositional systems. All of which must be understood in a regional as well as a local context.
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Use of gammaspectrometric airborne data as tool in regional geologic mapping in the Parana State – Brazil
Authors J.H. Boniatti and F.J. Fonseca FerreiraThis paper presents results of the processing of gammaspectrometric data (TC, K, eU, and eTh) from a 300 km2 area to the North of Curitiba, PR. Samples are separated 67 m from each other along 1,000 m spaced, 120 m high flight lines.
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Avaliaçao Geotécnica - Geofísica das Subestruturas da Ferrovia Vitória - Minas (EFVM) Usando o Radar de Penetraçao no Solo (GPR)
Authors M.A. Barsottelli Botelho and C.G. JorgeThe application of Ground Penetrating Radar (GPR) as a Non Destructive Test (NDT) technique for the assessment of railway track bed ballast is presented in this paper. The GPR was applied on Vitória – Minas railroad (EFVM) and it allowed us to detect changes on geometry and composition of the ballast and sub-ballast which were revealed by amplitude and geometry variations of the reflectors corresponding to the air-ballast and ballast-sub-ballast interfaces.
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Modelagem Numérica Espectral Associada a Migraçoes Pré e Pós Empilhamento para Imagear as Estruturas Internas de um Arenito Análogo de Reservatório da Formaçao Água Grande, Bacia do Reconcavo (BA)
Authors O. Neumann and M.A. Barsottelli BotelhoO método geofísico eletromagnético designado por Radar de Penetração no Solo (GPR) é usado para investigar as estruturas internas de um afloramento de arenito pertencente à Formação Água Grande, na Bacia do Recôncavo. O arenito estudado é um afloramento representativo de uma das rochas reservatório de hidrocarbonetos da Bacia do Recôncavo, constituindo assim um chamado análogo de reservatório. A aquisição dos dados de GPR usou antenas de 200 MHz com a configuração de afastamento constante.
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Elements of Electromagnetic Theory for GPR Applications
Authors J.M. Carcione and M.A. Barsottelli BotelhoWe develop some aspects of the electromagnetic theory regarding the application of the ground-penetrating radar (GPR), namely, a model for the composite dielectric constant, the amplitude variations with offset (AVO), the concept of exploding reflector and Backus averaging to obtain the properties of finely-layered media. The electromagnetic properties are obtained by using a generalization of the Hanai-Bruggeman (HB) equation. The HB exponent (1/3 for spherical particles) is used as a fitting parameter for a sand-clay mixture saturated with water.
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Localização de Manilhas de Concreto Instaladas no Sítio Controlado de Geofísica Rasa do IAG-USP Através de Multi-Configurações das Antenas GPR: Resultados Preliminares
Authors R.S. Lima and J.L. PorsaniThis article shows the preliminary results of multi-configurations GPR antennas in order to locate concrete tubes installed in the Shallow Geophysical Test Site or Sítio Controlado de Geofísica Rasa-SCGR of IAG/USP. Four arrays of antennas were used: TE mode (Transversal Electric), TM mode (Transversal Magnetic), and the TE and TM Cross-Polarizations, according to definitions of Radzevicius & Daniels (2000). The results showed that the TE mode was excellent to detect concrete tubes that presented clear reflections, followed by TM mode.
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Polarization Issues in a Recent Sedimentation Environment
Authors J.M. Travassos and S.S. AndréThis work presents the preliminary results of a GPR survey done at Marambaia, RJ. Part of data acquisition gotten in the region will be presented, and will show to the result of multi polarization of a GPR section.
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Simulações Numéricas GPR para Arqueologia: Exemplos de Sambaquis e Urnas Funerárias
Authors S.I. Rodrigues and J.L. PorsaniIn this article, numerical simulation of GPR results are presented in order to detect human bones and funerary urns inside of carbonate shell layers (sambaquis), as well as to locate structures of dunes and water table. The results showed that human bones and funerary urns can be detected, however, they presented the same reflection pattern, not being possible to differentiate them. The structures of dunes and the water table also are identified, but depend on the electrical conductivity of sambaquis layer, which is underlying dunes. The obtained results are significant and will serve of base for future field works. Moreover, it shows the importance of numerical modeling as an auxiliary tool in interpretation of data, decreasing the uncertainties in interpetation process.
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Processamento de dados GPR registrados na Lagoa do Abaeté pelo método de empilhamento CRS
Authors G. Garabito, M.A. Barsottelli Botelho and T. DouradoThe Common Reflection Surface (CRS) stack method is suite to simulate a zero-offset section with high quality and high signal-to-noise ratio from multi-coverage reflection seismic data. This seismic imaging method is fully automatic and it may be applied to irregular geometry data. We present the first results of the application of the Common Reflection Surface (CRS) method based on global optimization to simulate a zero offset stacked section from multi-coverage Ground Penetrating Radar (GPR) real data. We lso present a comparison of the results of the CRS processing with the conventional NMO processing. The results show that the CRS processing provided a zero-offset stacked section with better resolution.
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Utilização do Geo-Radar nos trabalhos de escavação do Sítio Teixeira Lopes, Juiz de Fora, Minas Gerais, Brasil
Authors P.R.A. Aranha, A.P. de Paula Loures de Oliveira and C.H.B. RochaThis paper shows the GPR's results of its application on the study of the Teixeira Lopes Archeological Site, Juiz de Fora, Minas Gerais, Brazil. The excavation works took place in October 2004, in an attempt to verify archeological evidences that resisted the destruction of the site during the opening of two silos, in 1982. The material remains, as ceramic fragments and quartz chips, were quite deteriorated. In order to dinamize the work the area was profiled with the GPR (Ramac) through parallel lines 1 m apart, with 400 MHz antenna set, and interval acquisition at 0,05m. The radargrams detected some anomalies that were checked in loco and identified as wires, plastic, garbage, and others. This demonstrates that the Site is being even more disturbed since the 1982. Afterall, the GPR showed success in the application in this research.
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