柴达木盆地北缘原油中单体正构烷烃的碳、氢同位素组成研究  

Carbon and Hydrogen Isotopic Composition of Individual n-Alkanes for Crude Oil from North Margin of Qaidam Basin

作　　者：张明峰[1] 妥进才[1] 吴陈君[1] 张小军[2] 郭力军 

机构地区：[1]中国科学院地质与地球物理研究所中国科学院油气资源研究重点实验室,兰州730000 [2]中国石油勘探开发研究院西北分院,兰州730020 [3]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《沉积学报》2012年第5期983-990,共8页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:41103022);中科院重要方向项目(编号:KZCX2-EW-104);中科院“西部之光”人才培养西部博士项目联合资助

摘　　要：以柴达木盆地北缘不同构造带代表性原油作为研究对象,采用GC—TC—IRMS技术对原油中正构烷烃单体碳、氢同位素进行测定。利用样品正构烷烃单体碳、氢同位素组成特征及分布模式,进行原油成因类型划分和对比分析。研究结果表明,正构烷烃可溶有机质的δ13C分布在-36‰～-25‰,δD分布在-180‰～-110‰。对比发现,不同构造带原油中正构烷烃单体碳、氢同位素组成特征上存在着比较明显的差别。以-30‰(δ13C)和-140‰(δD)作为分界,结合同位素曲线的分布型式,可以划分为不同的分布模式判识生烃母质和沉积环境。Using GC/C/MS on-line carbon isotope analysis technique, we obtained the carbon and hydrogen isotopic composition of individual n-alkanes for crude oil from different tectonic belts of the north margin of Qaidam Basin. The carbon and hydrogen isotopic composition of n-alkanes for crude oil samples can be used to analyze genetic type of crude oil and oil-source correlation. The analytical results indicate that the 8t3C and 8D values of n-alkanes in soluble organic matter ranging between -36%0--25%0 and -180%o ^-110%o, respectively. Through comparing, it is found that there exist significant differences between the carbon and hydrogen isotopic composition of n-alkanes for crude oil from different tectonic belts. By the combination of ~13Cn.alk （-30%0）, 8Dn.,lk （-140%o）, and distribution pattern isotopic curve, the carbon and hydrogen isotopic composition can be divided into different distribution patterns. Using these patterns can discriminate hydrocarbon ~eneration material and sedimentary anvlranrnant

关 键 词：单体正构烷烃 碳同位素 氢同位素 生物标记化合物 柴达木盆地北缘 

分 类 号：P593[天文地球—地球化学]