Distribution of aromatic biomarkers in pyrolysates of coccolithophore

Analyses of the original and pyrolytic products of coccolithophore at vario us temperatures suggest that the contribution of coccolithophore to the for mation of large immature oil reservoirs should attract keen interest. Throu gh biochemical processes algae can change inorganic sulphur into organic su lphur, which could be one of the most important precursors of organic sulph ur compounds in oil and source rocks. When Methylphenanthrene Index (MPI) a nd Methylphenanthrene Ratio (MPR) indices were used to evaluate the evoluti on degree of source rocks and oil maturity, other maturity indices must be used together for correction. In low maturity, the relative abundances of d ibenzothiophene (DBT), fluorine (F) and dibenzofuran (DBF) can be used to i dentify the oxidation-reduction environments.