1. 1. The quantitative distribution and the composition of porphyrins in North Sakhalin crude oil were examined. The concentration of vanadylporphyrins was shown to decrease and the content of nickel complexes in crude oils was shown to increase in southerly and westerly directions. 2. 2. All the crude oil examined had similar vanadylporphyrin structural-group composition. 3. 3. Sakhalin crude oils differ from those in Western Ekhabi in the relative content of porphyrin isomers most likely to be retained in ivnerted-phase chromatography (molar mass values 487, 501 and 515).
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