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. Characterization of carbonate rocks presents several challenges regarding the acquisition of petrophysical parameters and the understanding of fluid-flow dynamics in their pore system. To face these challenges, techniques such as X-ray microtomography, three-dimensional digital model reconstruction and fluid-flow numerical simulations have been continuously developed and improved. This study analyzes the representative elementary volume (REV) of a region of interest (ROI) of a highly heterogeneous stromatolite sample. Porosity and permeability are estimated for different subvolumes of the sample based on digital petrophysics. All necessary steps for reconstruction and segmentation of the complex pore system of the sample, as well as numerical simulations of fluid flow, are presented and discussed. The workflow is promising for reservoir evaluation because it can be applied to any type of carbonate rock. Keywords: Stromatolite, mCT, segmentation, REV, digital petrophysics RESUMO. A caracterizacao de rochas carbonaticas apresenta diversos desafios quanto a determinacao de seus parâmetros petrofisicos e o entendimento da dinâmica de escoamento de fluidos em seus sistemas porosos. Tecnicas como a microtomografia de raios X, a modelagem digital tridimensional e a simulacao numerica do escoamento de fluidos tem sido continuamente desenvolvidas e aprimoradas para superar esses desafios. Este estudo analisa o volume elementar representativo (REV) em uma regiao de interesse (ROI) de uma amostra de estromatolito altamente heterogenea. A porosidade e a permeabilidade sao estimadas em diferentes subvolumes da amostra atraves da petrofisica digital. Sao apresentadas e discutidas todas as etapas necessarias para a reconstrucao e segmentacao do sistema poroso e a simulacao numerica do escoamento de fluidos. A metodologia e promissora para avalicao de reservatorios visto que o fluxo de trabalho pode ser aplicado a qualquer tipo de rocha carbonatica. Palavras-chave: Estromatolitos, mCT, segmentacao, REV, petrofisica digital

brazilian journal of geophysics

REPRESENTATIVE ELEMENTARY VOLUME OF A REGION OF INTEREST OF A HETEROGENEOUS CARBONATE ROCK USING X-RAY COMPUTED MICROTOMOGRAPHY AND NUMERICAL SIMULATION