Dependência da porosidade e da permeabilidade com a seleção granulométrica em rochas artificiais não consolidadas

Abstract

The objective of the present work was to obtain samples to be used in the validation of the various theoretical models that describe the physical properties of the rocks, as well as to study the porosity and permeability dependence with the selection in unconsolidated artificial rocks, since the porosity and permeability are some of the variables influencing the flow of fluids, and the most important parameters that contribute to the understanding of the physical properties of porous media. For this to be possible, it was necessary to apply some data collection and analysis methods, starting with a rigorous granulometric analysis that allowed to identify the size of the grains, as well as the frequency with which they occur in a certain size range. In order to do so, it was necessary to sift the grains and the analysis in order to generate a mixture of grains from very well selected to extremely poorly selected. From the data analysis of very well selected until poorly selected grains, it was possible to construct graphs and tables that show in a simple way the behavior of the porosity, permeability and grain distribution around the mean. In particular, the use of the gas porosimeter, the variable charge permeameter and, above all, the soft ImageJ, proved to be of great value for the experimental processes and the analysis of the samples. Finally, through the entire study, it was possible to confirm, even partially, that samples made of artificial material (glass beads) are very close to the theoretical models available in the literature. It was also observed that the results showed that depending on the degree of grain selection the permeability and the porosity of unconsolidated rocks does indeed vary.