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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
1 - 20 of 462 results
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Especialidad “geofisica petrolera”: una plataforma de enseñanza activa
Authors R.A. Quesada García, G.M. Pagés and R.G. CaraballoLa especialidad de postgrado “Geofísica Petrolera”que se está impartiendo por el Instituto Superior Politécnico “José Antonio Echeverría” (ISPJAE) de La Habana, Cuba, contempla entre sus objetivos, el diseño curricular de las asignaturas basado en el empleo de una plataforma activa de aprendizaje, que incluye el uso de casos, conferencias interactivas, prácticas, debates en grupos, defensas de informes, etc., conformándose con estas componentes, un proyecto pedagógicamente innovador.
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El método de casos: su aplicación a la enseñanza de la sismica petrolera
Authors G.M. Pagés and R.A. Quesada GarcíaEl presente trabajo esta dedicado a exponer algunas reflexiones sobre el diseño de la Especialidad de postgrado “Geofisica Petrolera” que se imparte por el Instituto Superior Politécnico “José Antonio Echeverría” (ISPJAE) a ingenieros geólogos de CubaPetroleo (CUPET).
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Um Indicador do Valor da Informação Sísmica em Projetos de Exploração de Petróleo
Authors Alexandre A. Coelho and Saul B. SuslickThe assessment of exploratory opportunity has a fundamental importance in the upstream oil industry due to a high number of projects and the limited budget of the companies. The valuation of each project depends on the estimation of oil quantities from a given field which accuracy changes with the ability of measure the reservoir size. In the last decades, the technological progress positioned seismic data as a significant source of information for opportunities. Therefore, it is necessary that the technology used to get information should be incorporated at assessment process. This paper presents a methodology by using an indicator of seismic information which its value gives a degree of confidence of the technological seismic option used. This methodology also develops an option to estimate the value of imperfect seismic information for new surveys through the inclusion of the amount of data, its quality, the embedded geological model, the adequacy and performance of the technology used and others characteristics inherent of basin such as its signal-to-noise ratio that can influence the quality of the data. The main goal of this methodology is to support the assessment and ranking of exploratory opportunities giving valuable information to the decision process in a consistent and standard form. A case study presented shows that the indicator presents good performance by adjusting the opportunities, considering the most reliable outcomes and improving the decision-making process.
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3D Seismic Interpretation and its Implications to a New Structural Model on the South of Santos Basin, Brazil
Authors C.L. Queiroz, R.D. Damasceno, A. Pereira, J.J. Rodrigues, E.J.J. Marques, F.C. Rigon and M.M.M. CortezIn the south of Santos Basin, on the coasts of Santa Catarina and Paraná States, there are light hydrocarbon fields named Tubarão, Estrela do Mar, Coral, Caravela and Cavalo Marinho. Reservoir rocks are mainly constituted by oolitic grainstones, generally dated as Meso Albian and interpreted as oolitc bars grown over rool-overs crests.
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Emprego do método gamaespectrométrico para investigação em sítio arqueológico tipo “terra preta arqueológica” (TPA), no Estado do Amazonas
The carried through gama-ray espectrometric survey in a portion of the archaeological place of the Village of Paricatuba, located in the municipal district of Iranduba (AM), in the form of four profiles of 50m and distance equal itself of 2m, with 51 points each, disclosed significant to radiometric anomalies in the related largenesses the total counting and in the specters of the U, Th and K. The answers most intense had been observed in the canal of thorium, with intensities of up to 15 C.P.M., followed of the canal of the uranian one, with up to 9 C.P.M., while that the radiometric totals had normally revealed inferior the 6 C.P.M. e the canal of the potassium showed values of up to 170 p.p.m. Such anomalies can be associates with local concentrations of organic substance, as well as the presence of ceramic devices.
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Análise de AVO na bacia do Ceará
Authors W.N. de Amorim, D.C. Dutra, J.M. Neto, A.M. Filho and V.C. CondeIn this paper we will show the AVO analysis of a strong negative amplitude anomaly over an Upper Cretaceous disconformity at the Ceará basin. The analysis of the available seismic volumes (NEAR, MID and FAR) and the petrophisic modeling in a deep water well of the basin, require the utilization of the NEAR and MID volumes for this study.
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Lagosta - Ocorrência de Gás em AVO Classe 4 na Bacia de Santos
Authors R.D. Damasceno, F.B. da Silva and E.J. JungThe discovery of a gas field in the Santos Basin, with a class IV AVO anomaly showed that for this basin, the occurrence of this kind of AVO should be examined with special attention and must not be despised in comparison to the class III AVO, traditionally considered the best hydrocarbon diagnostic. This discovery also reaffirms the importance of AVO as a predictive exploration tool.
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Pre-Stack Seismic Data: A new Border to the Exploratory Interpretation
More LessThe Technology for petroleum exploration has been developed in an impressive way. This evolution imposes to the interpreter a constant technological updating and this, he/she needs to know different areas in a multi-disciplinary environment.
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Aprendendo a confiar em Greenberg-Castagna
More LessGreenberg and Castagna’s (1992) technique of shear-sonic construction using Vp data, is a lithology based regression which uses the Gassman equation. As an empirical relation, it should apply only to the set of rocks that generated it. But is seems to be more robust than initially imagined. The Greenberg-Castagna method was used to predict Vs in six wells from different Brazilian Basins. The analysis suggests that the method is applicable for most part of the data. Despite some good results showed here, it should always be used with a full understanding of its assumptions and limitations. It is hoped that the ideas presented herein may lead to a better understanding of the technique, and to reduce uncertainty in its application.
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Impedance-Type Inversion of the P-P Reflection Coefficient
Authors A. Davolio and L.T. SantosThe exact expression for the P-P reflection coefficient (Zoeppritz equations) has a rather complicated dependence on the medium parameters (P- and S-wave velocities and density) at both sides of the interface. For the inversion purpose, it’s required approximations formulas. In this work we discuss some approximations based on Taylor series and on the impedance concept. We also present the inversion process induced by these approximations.
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Impedance-based indicator for elastic parameters prediction
Authors V.S. Grosfeld and L.T. SantosIn the last two decades, many approximations for the P-P reflection coefficient have been proposed in the literature. Almost derived from the cassical aproximation of Aki & Richards, using additional assumptions on the medium parameters.
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Amplitude Variation with Ray Parameter Analysis Using the Reflection Impedance Concept
Authors L.T. Santos and M. TygelThe Common Relection Surface method provides semblance and attributes panels, which gives information about the ray-parameter at the reflection point at possible interfaces in the elastic model. The reflection impedance function, gives an approximation for the reflection coefficient which is suitable for inversion purposes. Combining both procedures, we have a practical amplitude versus rayparameter analysis which is suitable for inversion of rockpropertie
parameters.
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New Perspectives on Deep Ocean Exploration
By P.A. RonaOur vision of marine mineral resources is expanding with present and potential scientific and economic benefits as our understanding of the Earth advances. The introduction of the theory of plate tectonics opened new prospects for exploration in the deep ocean within and beyond the 200 nautical mile-wide Exclusive Economic Zone (EEZ) offshore coastal states. This paper presents the expanding perspective of non-living and living resources of the deep seafloor and is accompanied by the first film to clearly illuminate hydrothermal vents and their ecosystems in the deep ocean.
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Brazilian Research in Extreme Environments: New Perspectives for Integrated Biological and Geological Activities
Authors L.S. Campos, L.P. Gamboa, H.P. Lavrado and A.P.C. FalcãoExtreme sea environments are considered here as those that are difficult to access and mostly require high technology logistics for any research work to be undertaken, i.e., mainly the deep sea and polar regions. Approximately 80-90 % of the oceans have over 3000 m water column (Gage & Tyler 1991), and most ecosystems within this large area are still to be investigated in more detail. The main ecosystems of these extreme environments include the continental margins, seamounts, abyssal plains, ocean ridges, hydrothermal vents and cold seeps.
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The Brazilian expanded continental shelf beyond its Exclusive Economic Zone
By L.C. TorresThis study has the purpose of describing and showing by some pictures the Brazilian effort in order to establish the outer limit of its expanded continental shelf beyond its Exclusive Economic Zone (EEZ) on Atlantic Ocean.
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Considerations for Deepwater Seismic Imaging
Authors P. Whiting, C. Notfors and G. HodgkissDeepwater seismic imaging presents many challenges that are unique to deepwater environments, along with many familiar challenges that are emphasised by the presence of a long water column. In some cases, the depth of the water will make one or two of these challenges of paramount importance whereas, with a different water depth, the same challenges may be insignificant. It is important to have the tools to deal with all possible challenges to ensure that the image will not be compromised.
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Mega-Furrows, Contour Currents and Density Flows of the Northwest Gulf of Mexico Continental Slope and Rise
Authors W.R. Bryant, D. Bean and N. SloweyA geophysical survey of the northern Gulf of Mexico Continental Slope and Rise around Bryant Canyon in the spring of 1999, collecting deep-tow data, which consisted of a 3.5 kHz subbottom profiler and a 100 kHz side-scan-sonar, surveyed a series of longitudinal mega-bed-forms in ~3000 m of water along strike and at the base of the Sigsbee Escarpment.
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ADN method: simultaneous determination of porosity and shale content.
Authors A.I. Fischetti and A. AndradeA key step in petrophysical formation evaluation is the determination of porosity values corrected by the effect of shale content (shaliness) and consequently to produce a better estimate of oil saturation.
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Shale Characterization and Well Correlation by Competitive Neural Networks
Authors A.I. Fischetti, A.C. Fischetti and A. AndradeThe lithological characterization of a rock layer crossed by a borehole and its identification in the neighbor wells (well correlation) in an oil field are of great importance for reservoir studies that aim to improve the volume of oil recovered. In spite of the actual drilling technology is not usual to core all boreholes in a field and an alternative manner to deal with it is to use well log data.
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Determination of mineral composition of reservoir rocks by expert system and genetic algorithm
Authors A.C. Fischetti, A.I. Fischetti and A. AndradeThe information about mineral composition of reservoir rocks is important to obtain more realistic porosity estimative. The log analysts usually consider a reservoir rock composed by a solid portion (matrix) and a fluid portion (pore). The fluid portion or porosity determination is fundamental to obtain the reserve potential and reservoir qualification.
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