STUDY OF BIODEGRADATION EFFECT ON AROMATIC BIOMARKER PARAMETERS

In most cases,biodegradation is the main factors which cause the crude oil sticky.At present,biodegradation effect on saturated hydrocarbon biomarkers,nitrogen compounds and their parameters is mostly studied,with less attention is paid to the research of aromatic biomarker parameters.Four oil samples with different degraded degrees in Bozhong Sag of the Bohai Bay Basin are selected.By using GC-MS tests,the biodegradation influences on some aromatic biomarker parameters in crude oils especially on maturity indicators under natural conditions is preliminarily discussed.The results indicate that the maturity of oil degradation calculated by using methyl naphthalene ratio(MNR) is less than that before degradation,and the maturity calculated by using methyl phenanthrene ratio(MPR) is larger than that before degradation.However,the maturity of oil degradation calculated by using triaromatic steroid/monoaromatic sterane(TAS/MAS) ratio is basically undistortion.