Vanadium and nickel porphyrins are typical of hydrocarbons, they are not found in biotic porphyrins
D,Anton The porphyrins are a class of heavy molecules which are found both in abiotic and biological systems.
Some molecules of porphyrins have special biological significance: vitamin B12 and chlorophyll (a porphyrine is agent of photosynthesis in plants), and the molecule heme , which is the porphyrin component of hemoglobin (a substance that allows the transport of oxygen in the blood of mammals).
For the purposes of illustrating the high molecular weight of porphyrin it is transcribed the empirical chemical formula of hemoglobin: (C738 H 1166O208N203S2Fe).
However, neither vitamin B12 , or chlorophyll or hemoglobin, or any biotic porphyrin have been observed as natural components of oil.
Porphyrins have natural oil known differences with those found in chlorophyll or heme.
For example, the central metallic element in chlorophyll is magnesium while in heme is iron.
In oil porphyrins the central metal element is vanadium or nickel. Of course the source of these two elements is almost certainly the deep interior of the Earth.
According to Thomas Gold, porphyrins are one of the many “molecular vehicles” which allow carbonaceous fluids to transport metals and enable its concentration in deposits.
From "Unexhaustibles? Natural Gas and Petroleum", Danilo Anton, Piriguazú Ediciones
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