ABSTRACT Three-phase flow in porous media is a common phenomenon in hydrocarbon reservoirs. This study presents quantitative maps of fluid distribution in a granular porous medium using micro computed tomography (MCT). The study was done in an effort to determine the position, distribution and saturation of each phase at the pore-scale level. Quartz sand was used as the porous media. The fluids used were water (doped with NaI), benzyl alcohol (BA) and decane (doped with iodo-dodecane). The three fluids and the solid phase were mapped in images that were acquired at a single energy setting. Single-phase, two-phase and three-phase saturation distribution maps were developed. The intermediate phase was detected by direct observation of the phase distribution in the porous medium, thus confirming calculations using interfacial tensions and the spreading coefficient. The results obtained from this research showed that micro computed tomography is a useful technique to study multi-phase flow mechanisms in porous media. This work provided three-dimensional maps of fluid saturations at the pore level and should allow the reconsideration and adjustment of pore-scale modeling. This method provides the possibility to obtain three-dimensional saturation data that can be used for simulator development and calibration of models.