Reconstrução tridimensional de meios porosos utilizando técnicas de simulated annealing

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The characterization of porous materials constitutes a problem of scientific and technological interest. Determination of the macroscopic properties of the porous medias have application in many areas, such as production of petroleum, civil and mechanical engineering, for example. In the present work are presented computational methods to estimate the intrinsic permeability and the formation factor. With this methods are used the techniques of digital image analysis. The intrinsic permeability is determined using series-parallel, or cut-and-rejoin, models. These models calculate the permeability from the porous size distributions functions and are characterized by the easy of use and for obtaining fast results. The formation factor is determined by the relation between the electrical resistivity of the porous media saturated with a conducting fluid and the electrical resistivity of this fluid. The Random Walk method is used to calculate the resistivity of the fluid saturated porous media. These computational methods to estimate the intrinsic permeability and the formation factor are applied to reservoir rocks. Digital images were captured from thin sections of the reservoir rocks with optical microscopes. This images were segmented, and from the binary images, the porosity, the porous size distribution and the correlation function of the cores were determined. Using the porous size distribution determined from mathematic morphology the results of intrinsic permeability are obtained using some propositions of series-parallel models. The correlations are used to reconstruct the three-dimensional images using a truncated Gaussian model, and the 3-D images are used to obtained the formation factor.

ASSUNTO(S)

engenharia mecanica materiais porosos modelos tridimensionais

ACESSO AO ARTIGO

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