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Oil migration system is assessed by mathematical modelling analysis of carbazole distributions among five oil fields spread over 15,000 km2. Mathematical modeling results show that: 1) concentrations of carbazoles in reservoir oils is inversely related to the ratio of relative migration distance over the volume of oil-in-place, 2) derived equivalent cross-sectional areas for the migration channels are in the range of 1000 – 1500 m2 (mean of 1200 m2) which is equivalent to a half circular channel of 51 – 62 m in diameter (mean 55 m), and 3) the volume of oil left in the migration channels could be significant.