Abstract
Computerized Tomography (CT) scan imaging is a non-destructive method to characterize reservoir rock samples. The lithology and rock typing of more than 250 carbonate and sandstone samples were quantitatively and qualitatively investigated. The samples were collected from different formations, including dolostone, limestone, sandstone, and their combination. Their porosity and permeability ranges were from 5 to 30% and 0.001 to 1000 milli Darcy, respectively. The results showed that the reservoir rock lithology can be determined by combining the CT number with the porosity and grain density values. Unlike traditional methods, digital data was used in lithology determination with this method and the entire sample was examined. Qualitative petrological analysis by thin section and SEM methods show high uncertainty, as a tiny part of the rock is analyzed. Determining a new rock typing to study reservoir properties by image analysis was another result of this study. In the determined grouping, attention paid to the petrophysical separation, and the parameters that had a good relationship with permeability were utilized.
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