准噶尔盆地生油岩中的氨基酸

AMINO ACIDS IN THE SOURCE ROCKS OF ZHUNGAER BASIN, CHINA

阎佐鹏 周中毅

Yan Zopeng Zhou Zhongyi

中国科学院地球化学研究所

Institute of Geochemistry, Academia Sinica

氨基酸是地球上一切生物的普通成分,是构成蛋白质的基本单元,蛋白质一般由廿多种氨基酸组成。每年在地球上产生巨大数量的生物,它们死亡后经过生物化学作用和长期的地质历史变迁过程,使之氨基酸广布于土壤、沉积物、岩石、尘埃和天然水中,这些分布说明了氨基酸在地质体中是一类较稳定的化合物。地质体中除了蛋白氨基酸外还有经过化学成岩作用由蛋白氨基酸转化来的非蛋白氨基酸,从氨基酸地球化学角度而言,非蛋白氨基酸的分布研究也是很有意义的。

This paper presents the results of preliminary investigation on the distribution of amino acids and its relation to the source rocks in the Zhungaer Basin. The results show that the amino acid/organic carbon ratio in good source rocks are all comparatively high.Comparing the amino acid distributions of source rocks with some coal samples, it is found the types of kerogens are positively correlated to the compositions of amino acids. Proline is both observed in the kerogen of sapropelic source rocks and sapropelic coals, but no proline in humic kerogens. In addition, the characteristics of amino acids distribution of the lower organisms during diagenesis show a great differences between various sedi-mentary environments. When they are converted to oil, only the contents of basic amino acids diminish. When they are converted to coal, the contents of both acidic and basic amino acids decrease, but, the content of neutral amino acids increases. In conclusion, the investigation of the distribution of these three kinds of amino acids in the kerogens of source rocks may help differentiate the direction of convertion of original organic matter to oil or coal.

https://doi.org/10.11781/sysydz198602153