【摘要】 不同微生物降解级别原油的地球化学分析表明，轻度的微生物降解作用，对原油中含氯化合物没有明显的影响；中等降解的原油，随降解程度的增加，唑、甲基唑和C2-唑的浓度呈规律性的减小；严重降解原油，其含氯化合物浓度则显著降低。唑、甲基唑、C2-唑的相对百分含量在非严重降解原油中，并没有明显的变化；而在严重降解原油中，唑和甲基唑明显降低,C2-唑则升高。二甲基唑类，全屏蔽型、半屏蔽型、全裸露型三类异构体的相对百分含量，在非严重降解原油中无明显变化；在严重降解原油中，全屏蔽型和全裸露型增加，而半屏蔽型降低。更多还原

【Abstract】 Geochemical analysis of different degrees of biodegradated crude oils show that a slight biodegration affectslittle to the pyrrolic nitrogen compounds in the oils. The concentrations of cathazole, methylcarbazole and C2-carbazoledecrease with the increasing of the biodegradation for mid-degree biodegraded oils, the concentrations of pyrrolic nitrogen compounds sharply decrease in the heavily biodegraded oils. The relative concentrations of carbazole, methylcarbazole and C2 carbazole do not show any apparent changes in the non-heavly biodegraded oils; in the heavilybiedegraded oils, the concentrations of carbazole and methylcarbazole decrease, but that of the C2-carbazole increases.As the C2-carbazole isomers, the relative Percentage contents of the pyrolic N-H shielded, the prplic N-H semishielded and the pyrolic N-H-exposed carbazoles do not display any obvious variation in the non-heavily biodegradedcmde oils, but that of the pyrrolic N-H-exposed carbazoles increase and that of the pyrrolic N-H semi-shielded carbazoles decrease in the heavily biodgraded oils.更多还原