Characterization of Carbonate Rocks through X-Ray Microtomography
Image characterization of rocks is generally carried out by optical and scanning electron microscopy techniques. In this paper, the non-destructive technique of X-Ray micro tomography (μCT) was used in order to obtain microstructural parameters. The experimental program consisted in obtaining these properties from three different carbonate rocks: the Roman, Turkish and Itaboraí Travertines. The rocks were selected since they possess similar properties to the Brazilian oil-bearing pre-salt rocks. The results have shown that µCT is very useful in a) determining the porosity and pore size distribution, as compared to traditional porosimetry methods, b) establishing the pore arrangement within the rock matrix and c) detecting pore connectivity. Additionally, the generation of 3-D models allowed a faithful representation of the samples and allowed the selection of regions for thin section preparation of their most representative features, which were then analyzed by Digital Optical Microscopy.
Keywordsx-ray microtomography carbonate rocks porosity digital microscopy
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