QUANTIFICAÇÃO DE PROPRIEDADES PETROFÍSICAS A PARTIR DE MODELOS DIGITAIS DE ROCHAS VIA SIMULAÇÃO NUMÉRICA

Abstract

Petrophysics consists of the study of the physical properties of rocks, being of paramount importance for the characterization of reservoirs. Allied to this, x-ray computed microtomography has allowed, in a non-destructive way, the construction of microtomographic images of rocks, which has enabled the study of petrophysical properties of rocks. Therefore, this study aims to estimate the petrophysical properties of a carbonate rock sample from x-ray microtomography images, already available, using numerical simulation, and compare the estimated petrophysical properties with those measured in the laboratory. Avizo Fire 8.1 software was used for the processing and analysis of microtomographic images. A digital rock model was generated from the selection of 300 images (slices) of the middle part of the sample, in which a cubic subvolume of dimensions 300 by 300 by 300 voxels was extracted. After that, a segmentation process was performed on the images to distinguish the mineral matrix from the pores. And, later, after certain processing, its petrophysical properties were estimated. However, computer simulations to obtain the petrophysical properties were performed for the same subvolume generated for the rock sample under study.