CompuServe Messages

Mike; Regarding you msg on the origins of petroleum – I will say I subscribe to biological origins of petroleum. I believe the following gives credibility to the biological origin theory 1. Porphyrin complexes are found abundantly in natural products AND they are found in petroleum. One that comes to mind is the vanadyl-porphyrin complexes that have been isolated in petroleum. I believe that nickel and cobalt have also been isolated. These are COMPLEX molecules. I wonder how these could be formed without having a biological source. 2. The presence of complex aromatic and napthenic molecules are very abundant in crude oils. These include phenanthrenes, anthracenes, napthenes, etc. Note that these compounds have very similar structures to known amino acids and steroids. 3. The theory of inorganic sources for petroleum would require an explanation for the source of these complex molecules. Although catalytic formation of complex compounds might be possible over the eons, I have difficulty believing the thermodynamics are right to form larger molecules. Indeed I would believe that a breakdown of larger molecules to smaller one (such as methane) would be favored. But I'm a little weak on the thermo here – perhaps there is someone who has that tidbit tucked away and can elaborate on it. Isnt pristane and phytane found biologically and in crude oil? I believe these are considered "biomarkers" for source rock evaluation. Whats the explanation for the origin of kerogen and coal? Of course, this is just for discussion anyway Regards Bob