Dimensional microtomography metrology is a new approach in the petroleum and gas industry. Petrophysical characterization can be achieved by quantitative properties, such as porosity, which is one of the main parameter for the knowledge of reservoir potential. For example, the microporosity is a major factor of control water saturation in oil and gas reservoir. The smaller the pixel size the better the spatial resolution of the system, which leads to the investigation of the micropore network. The goal of this work is to investigate the impact of different pixel sizes on the characterization of internal rock porosity. For that purpose, sandstone rock samples were used in three different dimensions, which were achieved by trimming the edges of the samples. The total porosity results were not equivalent for the used spatial resolutions and the comparison among the microtomography images datasets and pore size distributions showed differences that enhances the importance of the spatial resolution for a complete characterization of the rock sample internal microstructure.
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