Seismic Migration
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. 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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2. Estrutura e evolução dos cordões arenosos pleistocênicos no canal de acesso à Laguna dos Patos-RS, Brasil
This work presents the results of a high-resolution seismic reflection data survey carried out in the Patos lagoon inlet, near Rio Grande the southernmost harbor of Brazil. The analysis of the reflection patterns reveals the presence of transgressive/regressive barrier structures and beach/foredune-ridges. The mapping of these barrier structures allows a bet
Publicado em: 2010
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3. Seimic resolution and time-to-depth conversion by the common-reflection-surface (CRS) method / Resolução sismica e conversão tempo-profundidade, atraves do metodo de superficie comum de reflexão (CRS)
The demand for large multiplicities in seismic processing has always been a tough target for the professionals involved in this area. Until recently, the major effort to meet this demand has been done during seismic acquisition, which, due to high cost, is not usually implemented. Recently, the Common Reflection Surface (CRS) technique filled this gap provid
Publicado em: 2008
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4. Migration in depth pre-piling up using the cinematic attributes of the piling up for surface of common reflection / Migração em profundidade pré-empilhamento utilizando os atributos cinemáticos do empilhamento por superfície de reflexão comum
The Common-Reflection-Surface (CRS) stack is a new seismic processing method for simulating zero-offset (ZO) and common-offset (CO) sections. It is based on a second-order hyperbolic paraxial approximation of reflection traveltimes in the vicinity of a central ray. For ZO section simulation the central ray is a normal ray, while for CO section simulation the
Publicado em: 2007
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5. As equações da onda imagem para remigração em meios elipticamente anisotropicos / The image wave equations for remigration in elliptically anisotropic media
The image-wave equations for the problems of depth and time remigration in elliptically anisotropic media are second-order partial differential equations similar to the acoustic wave equation. The propagation variable is the vertical velocity or the medium ellipticity. These differential equations are derived from the kinematic properties of anisotropic remi
Publicado em: 2007
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6. ANISOTROPY INFLUENCE ON NORMAL MOVEOUT CORRECTION IN VTI SEISMIC DATA AND VELOCITY ANALYSIS USINGGRADIENT DESCENDENT / INFLUÊNCIA DA ANISOTROPIA VTI NA CORREÇÃO DE SOBRETEMPO NORMAL EM DADOS SÍSMICOS E ANÁLISE DE VELOCIDADE POR GRADIENTE DESCENDENTE
This work quantifies the error created during seismic processing when isotropic approach is used to normal moveout correction and velocity analysis and the seismic data is anisotropic. This quantification is made by performing velocity analysis in several synthetic seismograms built from a simple (but realistic) geological model with some horizontal layers,
Publicado em: 2005
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7. MODELAGEM ACÚSTICA NO DOMÍNIO DA TRANSFORMADA WAVELET / ACOUSTIC MODELING IN THE WAVELET TRANSFORM DOMAIN
Seismic signal processing is a key step to oil exploration. The path between data acquisition and seismic interpretation is composed by a sequence of interdependent processes, among which are modeling and migration processes. A 2D acoustic modeling algorithm in wavelet Transform domain, based on custom tools and tools already made known in literature is pres
Publicado em: 2004
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8. True amplitude Kirchhoff time migration in the common angle domain / Migração Kirchhoff 2,5D em tempo no dominio de angulo comum e em amplitude verdadeira
The analysis of amplitude variation with offset or reflection angle is of great importance in the oil industry to predict hydrocarbon presence in the reservoir. This analysis is applied to both reservoir and exploration areas. The usual transformation method from offset to reflection angle, for common-offset migrated data, involves errors that may produce un
Publicado em: 2004
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9. LabSis : um ambiente para desenvovimento de aplicações sismicas Matlab
The Matlab package is a tool of widespread use in the academic environment, because of its advantages in simple direct programming, graphs and visualization tools. It allows initial implementations of algorithms and procedures very quickly in a series of applications. As a counterpar to the above good qualities, Matlab programs do not exhibit the computation
Publicado em: 2004
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10. Litoestratigrafia e deformação cenzóica na região de Icapuí, Ceará, e implicações para a estruturação de campos de petróleo na borda ocidental da bacia Potiguar(NE do Brasil)
This thesis deals with the sedimentological/stratigraphic and structural evolution of the sedimentary rocks that occur in the NW continental border of the Potiguar Basin. These rocks are well exposed along coastal cliffs between the localities of Lagoa do Mato and Icapuí, Ceará State (NE Brazil). The sedimentological/stratigraphic study involved, at the ou
Publicado em: 2003
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11. Recuperação de atributos sismicos utilizando a migração para afastamento nulo em verdadeira amplitude
In the present work a method was developed to extract reflections coefficients after applying amplitude zero offset migration (TA MZO) on synthetic seismic data composed of several commom offset sections. Sorting to the commom mid point domain (CMP) provides the conventional amplitude versus offset curve directly. A second MZO application with different weig
Publicado em: 1999