This research aims at making optimal updates of geological models by jointly inverting flow and seismic data while honoring the geologic spatial continuity. Numerical for reservoir characterization are increasing in complexity, due part to greater need model complex heterogeneity fluid subsurface. These models, once properly calibrated, can make better forecasts. calibration process requires essence solving an inverse problem. The inversion problem is formulated as minimizing mismatch...

A realimentação da derivada de estados tem recebido grande atenção em tempos recentes, por ser uma alternativa à e capaz de, exceto nos casos que há pelo menos um pólo na origem, prover a conhecida alocação pólos sistema linear invariante no tempo, é das principais aplicações estados. Com base procedimentos já consolidados para utilizando solução equação Lyapunov, são apresentados análogos estados, então apresentadas proposições análogas às aplicadas Exemplos apresentados, comprovando...

P032 Application of GCV in Geophysical Diffraction Tomography E. Santos (CEFET/BA and Stanford University) & A. Bassrei* (Federal University Bahia) SUMMARY Since inverse problems are usually ill-posed it is necessary to use some method reduce their deficiencies. The that we choose the regularization by derivative matrices. When a first matrix used order called first. Then second when formed differences zero means identity. There an important issue which selection

This paper discusses the acquisition of image and depth data from Microsoft Kinect's sensors for subsequent reconstruction a tridimensional environment, also emphasizing stage pre-processing. Additionally, an algorithm that uses 3D in order to verify if selected trajectory is viable route without obstacles along its path proposed. Results environment reconstructions trajectories are presented demonstrate performance approach.

Time‐lapse imaging has been successfully applied by oil industry for reservoir monitoring along the years. Another relevant application using similar theoretical background although with different purposes, is to monitor CO2 sequestration detect possible leaks that may cause environmental impact. We propose reduce number of parameters and consequently simplify update surveys two complementary key concepts: (1) keeping information from previous be updated a smaller new survey; (2) adaptive...

A method is described to approximate the 3D form and distribution of mineral dust (MD) aerosol particles based on digital in-line holographic imaging. The concept involves constructing a geometrical hull particle defined by image-perimeter curves from sequence 2D images. Measuring holograms every ten milliseconds results in video revealing flow MD 3D. Examples two samples different mean particle-size are presented.

Dynamic imaging provides an effective way to integrate previous surveys seismic data in order estimate current velocity model. It is particularly useful for time‐lapse imaging, which has been successfully applied reservoir monitoring over the years by oil industry and developed sequestration more recently. This work aims introduce a new dynamic method permanent acquisition systems monitor injection detection of undesired leaks that may cause environmental impact. We propose called DynaSIRT...

Redução de ordem modelos monovariáveis, sistemas lineares invariantes no tempo, contínuos, descritos por uma função transferência racional, é técnica amplamente difundida na simplificação modelos, como forma reduzir complexidade envolvida em análise e projeto. Um método simples para redução baseado minimização da norma dos coeficientes do numerador polinômio erro proposto, diversos resultados apresentados demonstram a validade o mérito abordagem.

Inverse problems in geophysics are usually ill-posed, such a way that regularization is one possibility to have more stable solutions. The quality of the regularized solution however depends on appropriate selection parameter λ. One now popular tool for λ so-called L-curve, reintroduced literature inverse by Hansen 1990’s. L-curve may sometimes provide non-optimal imaging, so present work we compare three methodologies ofλ. first provided Hansen’s toolbox. second visual inspection built us,...

PreviousNext No Access10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007Metodologias extração parâmetro ótimo regularização a partir da curva L: aplicação em tomografia tempos trânsitoAuthors: Felipe A. TerraAmin BassreiEduardo T. F. SantosFelipe TerraIGEO/UFBA, Amin BassreiIF/UFBA and CPGG/UFBA, Eduardo SantosCEFET/BA e Stanford Universityhttps://doi.org/10.1190/sbgf2007-312 SectionsAboutPDF/ePub ToolsAdd to...

Inverse problems are usually ill-posed in such a way that it is necessary to use some method reduce their deficiencies. For this purpose, we the regularization by derivative matrices, known as Tikhonov regularization. There crucial problem regularization, which selection of parameter λ. In work, generalized cross validation (GCV) tool for GCV used here an application geophysical diffraction tomography, where objective obtain 2-D velocity distribution from measured values scattered acoustic...

Phase-locked loops (PLL) is a phase and/or frequency tracking system, widely used in communication and control systems. The sinusoidal multiplicative type PLL still remains recurrent model, due the fact that its derivation originated from maximum likelihood approach. In this note, it showed as generalized product, called q-product, which can be to implement detector improve some important parameters of block linearity pull-in characteristics. Numerical examples are presented order illustrate...

We present the design and analysis of subwavelength lenses based on air cylindrical waveguides surrounded by metal for focusing light in very small areas. The are composed several concentrically disposed air-metal with different widths order to control phase shifting necessary focus light. we designed operate at visible frequencies then, propagation mechanism along is obtained surface plasmon polaritons (SPPs). structures have been analyzed an efficient finite element formulation coordinates...

O principal objetivo deste artigo é apresentar o desenvolvimento de um tomógrafo ultrassônico que simula monitoramento dinâmico da injeção CO2 em reservatório hidrocarbonetos. É proposto uso tomografia ultrassônica para detectar mudanças na velocidade do som causadas por corpo prova dentro meio com escala reduzida, visando simular campo, uma vez a também causa no sistema aquisição real simulado este composto fontes acústicas espaçadas uniformemente ao longo poço aproximadamente vertical...