Seismic Wave
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Simultaneous prestack seismic inversion in a carbonate reservoir
Abstract We applied a method of Simultaneous Prestack Seismic Inversion (SPSI) in a hydrocarbon field located in the Campos Basin, Brazil. The goal was to study the application of this method to Albian carbonate rocks of the Quissamã Formation. Based on what is found in nearby fields, this Formation potentially contains hydrocarbon accumulations that can be
REM, Int. Eng. J.. Publicado em: 2018-03
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2. Seismic Pressures in Offshore Areas: Numerical Results
Abstract The purpose of this study is to obtain numerical estimations of seismic pressures in offshore areas considering the effect of seabed configurations and soil materials. To this end, the Boundary Element Method is used to irradiate waves, so that force densities can be obtained for each boundary element. From this hypothesis, Huygens´ Principle is im
Lat. Am. j. solids struct.. Publicado em: 2016-12
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3. Seismic response of aboveground steel storage tanks: comparative study of analyses by six and three correlated earthquake components
Ground motions at a point on the ground surface can be decomposed to six components, namely three translational components and three rotational components; translational components include two components in the horizontal plane, and one in the vertical direction. Rotation about horizontal axes leads to rising of rocking, while the rotational component about
Lat. Am. j. solids struct.. Publicado em: 2013-11
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4. Wave passage effects on the seismic response of a maglev vehicle moving on multi-span guideway
As a seismic wave travels along the separate supports of an extended structure, the structure is subjected to multiple-support excitation due to seismic wave propagation. Considering the seismic wave passage effect, this paper describes seismic analysis of a maglev vehicle moving on a multiply supported gudieway. The guideway system is modeled as a series of
Lat. Am. j. solids struct.. Publicado em: 2013-09
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5. Propagação guiada de ondas de VLF: aplicação ao estudo de fenômenos atmosféricos e naturais
Deep amplitude minima are observed in the daily records of Very Low Frequency (VLF, between 3 - 30 kHz) wave amplitudes. Amplitude minima are attributed to modal interference and modal conversion of waves propagating in the Earth - Ionosphere waveguide. The time of amplitude minima is related with the localization of the Terminator line and, therefore, is de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2012
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6. Análise de condições de imagem por quadrados mínimos estabilizados para migração usando a equação da onda acústica / A comparison of stabilized least-squares imaging conditions for acustic wave-equation migration
Em uma migração sísmica, após o processo de propagação da onda, um importante passo para se obter uma imagem migrada é a aplicação de uma condição de imagem, que distingue entre pontos refletores e não refletores. A condição de imagem teórica desenvolvida por Claerbout usa uma deconvolução entre os campos de ondas descendente e ascendente (o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/09/2011
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7. Structural decomposition of the wave field in the solution of inverse seismic problems
Este artigo discute aspectos da aplicação prática da solução de problemas inversos sísmicos, baseados em modelos elásticos 1D de meio. A fim de melhor ajustar os modelos a observações reais, propomos utilizar uma decomposição estrutural, que permite transformar o campo de onda, correspondente a um modelo 3D, ao conjunto de dados, correspondentes a
Revista Brasileira de Geofísica. Publicado em: 2010-12
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8. Propriedades sísmicas anisotrópicas derivadas da orientação cristalográfica preferencial de muscovita-quartzo milonitos
Seismic wave propagation in organized matter usually results in azimuthal variations of longitudinal waves (Pwaves), as well as the effect of birefringence in transversal waves (S-waves), which results in two orthogonal shear waves with contrasting velocities. In this paper we present the results of the anisotropic seismic properties of five samples of musco
Publicado em: 2010
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9. Solução da equação da onda imagem para continuação do afastamento mediante o metodo das caracteristicas / Solution of the image-wave equation for offset continuation by means of the methd of characteristics
O deslocamento de um evento sísmico sob a chamada operação de continuação de afastamento (Offset Continuation Operation - OCO) pode ser descrita por uma equação diferencial parcial de segunda ordem que foi denominada de equação da onda imagem para OCO. Por substituição de uma solução tentativa da forma da teoria dos raios, pode se deduzir uma eq
Publicado em: 2010
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10. Supressão do ruído de rolamento superficial utilizando a transformada Curvelet
Among the many types of noise observed in seismic land acquisition there is one produced by surface waves called Ground Roll that is a particular type of Rayleigh wave which characteristics are high amplitude, low frequency and low velocity (generating a cone with high dip). Ground roll contaminates the relevant signals and can mask the relevant information,
Publicado em: 2009
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11. MODELAGEM SÍSMICA EM ARENITOS: EFEITO DA DISPERSÃO DA VELOCIDADE E DO TIPO DE FLUIDO / SANDSTONE SEISMIC MODELING: EFFECTS OF VELOCITY DISPERSION AND FLUID TYPE
The evaluation of reservoir dynamics during production through time-lapse interpretation has reached a substantial importance in the petroleum industry, mainly in sandstones. This evaluation presents many challenges, mainly concerned to unmask the overlapping of different effects in seismic data due to reservoir changes. Several factors affect seismic proper
Publicado em: 2008
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12. Seismic tomography with P- and S-waves for the study of the upper mantle in Brazil / Tomografia sísmica com ondas P e S para o estudo do manto superior no Brasil
We used travel time seismic tomography to study the upper mantle beneath SE and Central Brazil. This method is based on the inversion of P- and S-wave relative travel time residuals (VanDecar, 1991) obtained from more than 80 stations in an area of 20 x 20 degrees. More than 11000 P and PKP residuals, and more than 8000 S, ScS, SKS, and SKKS residuals were o
Publicado em: 2008