Produção Científica
Apresentação
| Inversão gravimétrica do relevo 3D de bacias sedimentares e da variação da densidade usando informação a priori sobre o ambiente geológico Cristiano M. Martins, Valéria C. F. Barbosa, João Batista C. da Silva, Williams A. Lima. 1º Workshop do INCT-GP (2011) |
Apresentação
| Uma formulação Bayesiana para inversão conjunta de AVO de dados PP e PS Sérgio Adriano Moura Oliveira, Fernando Sérgio de Moraes, Anderson Franco e José Caparica. 1º Workshop do INCT-GP (2011) |
Apresentação
| Medidas de coerência para análise de velocidade na migração em tempo. Jonathas da S. Maciel, Jessé C. Costa e Jörg Schleicher. 1º Workshop do INCT-GP (2011) |
Apresentação
| Results for three simple sea bed logging antenna models Allen Q. Howard. JR. 1º Workshop do INCT-GP (2011) |
Apresentação
| Recuperação de contornos não convexos de corpos anômalos na tomografia poço a poço em função da presença de ruÃdo Walter Eugênio de Medeiros, Roberto Hugo Bielschowsky. 1º Workshop do INCT-GP (2011) |
Apresentação
| High-order pseudo-analytical method for acoustic wave modeling Reynam Pestana, Chunlei Chu and Paul L. Stoffa. 1º Workshop do INCT-GP (2011) |
Apresentação
| Modelagem Bidimensional do Método Eletromagnético a Multifrequência. ValdelÃrio da Silva e Silva, CÃcero Roberto Teixeira Régis e Carlos Alberto Dias. 1º Workshop do INCT-GP (2011) |
Apresentação
| Fast estimation of common-reflection-surface parameters using local slopes Lúcio Santos, Jörg Schleicher, Jessé C. Costa, and Amélia Novais. 1º Workshop do INCT-GP (2011) |
Apresentação
| 3D complex Padé FFD migration: A comparison of splitting techniques Jessé C. Costa, Débora Mondini, Jörg Schleicher, and Amélia Novais SEG Expanded Abstracts 30, 4420-4424 (2011) SUMMARY Three-dimensional wave-equation migration techniques are quite expensive because of the huge matrices that need to be inverted. Many techniques have been proposed to reduce this cost by splitting the 3D problem into a sequence of 2D problems. We compare the performance of splitting techniques for stable 3D Fourier Finite-Difference (FFD) migration techniques in terms of image quality and computational cost. The FFD methods are complex Pade FFD and FFD plus interpolation, and the compared splitting techniques are two and fourway splitting as well as alternating four-way splitting, i.e., splitting into the coordinate directions at one depth and the diagonal directions at the next level. From numerical examples in homogeneous and inhomogeneous media, we conclude that alternate four-way splitting yields results of the same quality as full four-way splitting at the cost of two-way splitting. |
Apresentação
| Diffraction imaging point of common-offset gather: GPR data example J. J. S. de Figueiredo, F. Oliveira, E. Esmi, L. Freitas, S. Green, A. Novais, and J. Schleicher SEG Expanded Abstracts 30, 4399-4403 (2011) SUMMARY Hydrocarbon traps are generally located beneath complex geological structures. Such areas contain many seismic diffractors that carry detailed structure information in the order of the seismic wavelength. Therefore, the development of computational resources capable of detecting diffractor points with a good resolution is desirable, but has been a challenge in the area of seismic processing. In this work, we present a method for the detection of diffractor points in the common-offset gathers domain. In our approach, the diffraction imaging is based on the diffraction operator, which can be used in both the time and depth domains, in accordance with the complexity of the area. This method, which does not require any knowledge apart from the migration velocity field (i.e., rms velocities or interval velocities) applies pattern recognition to the amplitudes along the diffraction operator. Numerical examples using synthetic and real data demonstrate the feasibility of the technique. |
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