Carbon Preference Index
The Carbon Preference Index (CPI) ( English to German carbon preference index ) is a quantity that the maturity of that help oil is characterized. The ratios of even-numbered to odd-numbered n- alkanes are expressed in a numerical value using the following formula:
It is z. B. an alkane with 25 carbon atoms.
The values for immature kerogen will be > 1 (> 3), since biologically odd-numbered n-alkanes are preferred. In the course of diagenesis and catagenesis , even n-alkanes are produced through conversion processes, so that the value approaches 1 with increasing maturity.
Web links
- Methods (PDF file)
- Speciation of Organics (PDF file; 1.44 MB)