Seismic Processing
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Co-estimation geostatistical methods: a study of the correlation between variables at results precision / Métodos geoestatísticos de co-estimativas: estudo do efeito da correlação entre variáveis na precisão dos resultados
This master dissertation presents the results of a survey into co-estimation methods commonly used in geostatistics. These methods are ordinary cokriging, collocated cokriging and kriging with an external drift. Besides that ordinary kriging was considered just to illustrate how it does work when the primary variable is poorly sampled. As we know co-estimati
Publicado em: 2008
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14. REORGANIZATION AND COMPRESSION OF SEISMIC DATA / REORGANIZAÇÃO E COMPRESSÃO DE DADOS SÍSMICOS
Seismic data, used mainly in the petroleum industry, commonly present sizes of tens of gigabyte, and, in some cases, hundreds. This work presents propositions for manipulating these data in order to help overcoming the problems that application for seismic processing and interpretation face while dealing with file of such magnitude. The propositions are base
Publicado em: 2007
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15. 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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16. Coeficientes de reflexão elasticos : analise e aplicações / Elastic reflection coefficents : analysis and applications
In this work we are concerned with the reflection coefficients RPP and RPS for elastic waves. Based on the success of an impedance type approximation for the coefficient RPP in the critical region, we introduce a new approximation for the coefficient RPS. Although the new approximation was not so good as for the previous in the RPP case, comparing our approa
Publicado em: 2007
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17. Aplicações do metodo de superficie comum de reflexão (CRS) ao processamento sísmico / Applying the common reflection surface (CRS) method to the seimic processing
O método Common Reflection Surface (CRS) tem por objetivo a obtenção de seções empilhadas de qualidade e extração de parâmetros do campo de onda que caracterizam o meio geológico, através de análises de coerência e com máxima utilização da redundância contida nos dados sísmicos de multicobertura. Para a realização dessas finalidades, o mé
Publicado em: 2007
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18. Processamento e interpretação de dados 2D e 3D de GPR :aplicações no imageamento de feições kársticas e estruturas de dissolução no campo de petróleo de Fazenda Belém-CE
In Fazenda Belém oil field (Potiguar Basin, Ceará State, Brazil) occur frequently sinkholes and sudden terrain collapses associated to an unconsolidated sedimentary cap covering the Jandaíra karst. This research was carried out in order to understand the mechanisms of generation of these collapses. The main tool used was Ground Penetrating Radar (GPR). Th
Publicado em: 2006
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19. Um middleware reconfigurÃvel para redes de sensores sem fio
The WSN attractivity for environment conditions monitoring and to be the bridge between the physical and virtual world has been increasing due to the advances in the micro-electronics, which enabled the production of several sensor types like illumination, humidity, temperature, smoke, radiation, acoustic, seismic, etc. in a chip that processes the signal an
Publicado em: 2006
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20. 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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21. Delimitação de Reservatórios Delgados Utilizando Atributos Sísmicos
The Carapeba Field, discovered in 1982, is located around 65 km from the coast, at 90 m water depth, and had its production started in 1989. The Carapebas rock reservoirs are fine to coarse grained turbidite sandstones, locally conglomeratic, of Santonian age (around 85 Ma), at an average depth of 3000 m. These reservoirs are inserted in one of the most impo
Publicado em: 2005
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22. 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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23. SEISMIC PATTERN RECOGNITION USING TIME-FREQUENCY ANALYSES / RECONHECIMENTO DE PADRÕES SÍSMICOS UTILIZANDO ANÁLISES TEMPO-FREQÜÊNCIA
Independent of the adopted methodology to perform the seismic facies analysis, the geological oriented spatial and temporal segmentation of the reservoir region should be carefully done. Depending on the complexity of the reservoir system, seismic data quality, and the experience of the interpreter, the level of confidence in an interpretation can vary from
Publicado em: 2004
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24. 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