The non-porphyrin N and V complexes in the crude oils form may be primary or secondary. The metal complexes released from kerogen during categenesis and formation of metal-organic complexes represents primary origin, whilst secondary includes the metallic complexes derived via the interaction of oils with sediments or waters during migration, maturation; biodegradation may also affect the concentrations of some trace elements in crude oils. Nickel (Ni) and V occur in oils and bitumen as metallo-porphyrins and non-porphyrin species. Nickel (Ni) and V are usually the most abundant metals with values ranging up to 200 ppm Ni and 2000 ppm V. I'm looking forward to understanding the ideal ratio of V/Ni in the original porphyrin (animals and plant)?
Dear Salih,
•Virtually all the metal bound in organics is Ni and VO in porphyrin
•Non-marine oils with high terrigenous organic matter contents show high wax, low sulfur and very low metals contents
•Marine carbonates & siliciclastics show low wax, moderate to high-S, high overall nickel and vanadium but a low (2) Ni/V ratio
•Sediment redox state determines whether Ni of VO sequestered by porphyrin.
http://ocw.mit.edu/courses/earth-atmospheric-and-planetary-sciences/12-158-molecular-biogeochemistry-fall-2011/lecture-notes/MIT12_158F11_lec8.pdf
Hoping this will be helpful,
Rafik
- Badges
- Science topic
- Similar topics
- Education