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通过室内微生物降解模拟实验,考察了海上中质原油BZ34-1和重质原油SZ36-1中类异戊二烯类、萜烷类和甾烷类生物标志物组分的生物降解性.结果表明,在60 d的实验周期内,尽管2种原油中类异戊二烯类生物标志物包括姥鲛烷和植烷都发生明显降解,其中,中质原油BZ34-1中姥鲛烷和植烷的降解率分别为20.2%和15.0%,重质原油SZ36-1中姥鲛烷和植烷的降解率分别达到95.6%和75.4%;但2种原油中类异戊二烯类生物标志物发生降解的阶段不同,重质原油SZ36-1中类异戊二烯类生物标志物在实验初期(20 d)就开始发生降解,中质原油BZ34-1中类异戊二烯型生物标志物的降解主要发生在中后期(20～60 d).而2种原油中萜烷和甾烷类生物标志物在整个实验周期内都未发生明显降解.这表明在设定的实验周期内,植烷或姥鲛烷适用于评价降解初期的中质原油生物修复效果;而萜烷和甾烷类则适用于2种原油不同阶段生物修复效果评价.
The biodegradability of the biomarkers of isoprenoids, terpanes and steranes in marine medium crude oil BZ34-1 and heavy crude oil SZ36-1 was investigated by laboratory microbial degradation experiments. In the experimental period of 60 days, although both isoprenoid biomarkers including pristane and phytane were significantly degraded in the two crude oils, among them, pristane and phytane The degradation rates of pristane and phytane in heavy crude oil SZ36-1 reached 95.6% and 75.4%, respectively. However, the isoprenoid biomarkers of the two crude oils occurred In the different stages of degradation, the isoprenoid biomarkers of heavy oil SZ36-1 began to degrade at the beginning of experiment (20 d), and the isoprenoid biomarkers of medium crude oil BZ34-1 Degradation mainly occurred in the middle and late stages (20-60 days), while no significant degradation of terpane and sterane biomarkers occurred in the two crude oils during the whole experiment period, indicating that during the set experimental period, phytane Or pristane can be used to evaluate the bioremediation effect of the medium-quality crude oil in the initial stage of degradation. However, the terpanes and steranes are suitable for two kinds Different stages of bio-oil restoration Evaluation.