摘要
通过尿素络合去除饱和烃中正构烷烃、富集异构烷烃和环烷烃馏分，用色谱一同位素质谱（GC--IRMS）对松辽盆地青一段优质烃源岩生物标志化合物碳同位素进行测定，并用气相色谱一飞行时间质谱进行了化合物确认。松辽盆地青一段泥岩、油页岩的藿烷化合物碳同位素分布在-40．18‰～-58．9‰，具有中层水细菌和嗜甲烷菌的特征；姥鲛烷分布在-31‰～-33．64‰，植烷碳同位素分布在-29．9‰～-34．6‰，应该为原始光合作用的生物体（如生活在湖中含氧层上部的蓝藻细菌）贡献；泥岩的C31甾烷的碳同位素为-25．81‰和-25．52‰，与来自藻类的化合物相似；甲藻甾烷的碳同位素为-27．48‰～-30．56‰，远重于藿烷类化合物碳同位素。研究结果表明，松辽盆地扶杨油层原油绝大多数来源于青一段烃源岩。
Through the removing of the n-paraffin, enriched isoalkane and cycloparaffinic fractions from the satu- rated hydrocarbons by urea adduction, the measurement of the biomarker carbon isotope for Member Qing-1 high- quality source rocks of the hydrocarbon in Songliao Basin is conducted by gas chromatography-isotope mass spec- trometry （GC-IRMS ）. At the meantime, the compounds are confirmed by gas chromatography-flight-time mass spectrometry. The distribution scope of the carbon isotope of hopane compounds in the mudstones and oil shales in Member Qing-1 of Songliao Basin is -40. 18‰ - -58.9‰, which is characterized by medium-layer water bacte- ria and addicted methane bacteria; the pristane varies in the range of -31‰- -33.64‰, the distribution of phytane carbon isotope spreads -29.9‰- -34.6‰, owing to the contribution of original photosynthetic organ- isms, such as the cyanobacteria living on the upper part of oxygen-bearing layer in the lake ; the carbon isotopes of C31 sterane from the mudstones vary in the range of - 25.8 ‰ - 25.5‰, which are similar to algal compounds ; the carbon isotopes of dinoflagellate sterane distribute - 27.48‰ - - 30.56‰, which are far more heavier than those of hopane compounds. The study results show that most of the crude oil in Fuyang oil reservoirs are generated from Member Qing-1 source rocks of Songliao Basin.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2012年第3期19-23,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重点基础研究发展规划"973"项目
作者简介
李振广，男，1953年生，高级工程师，从事有机地球化学仪器分析及研究工作。E—mail：lizhenguang@petrochina．com．cn
