摘要
As triterpenoid biomarkers mainly derived from prokaryote （e.g. bacteria andcyanobacteria）, hopenoid hydrocarbons are ubiquitous in fossil fuels and sediments.Ensminger et al. （1974） reported a normal distributional pattern of C27-C35 (withoutC<sub>28</sub>) hopanes with an absolute predominance of C<sub>30</sub> hopane. In 1980, Seifert
