源岩热解气态烃的碳同位素特征及其在气源对比中的应用

CARBON ISOTOPE COMPOSITION OF PYROLYZED GASEOUS HYDROCARBON FROM SOURCE ROCKS AND ITS APPLICATION IN CORRELATION OF NATURAL GAS AND SOURCE ROCKS

李执 朱美茜 毛弘毅

Li Zhi Zhu Meiqian Mao Hongyi

人工热演化生成的气态烃的δC 值同地质体中天然气的δC 值一样,可以反映源岩母质类型与热演化水平。本文根据8个源岩样的生气模拟实验结果归纳了气态烃产率、碳同位素组成与源岩有机质类型及成熟度间的关系,进而利用源岩热解气态烃与天然气样的δC 值探索了塔里木与南松辽盆地的气源岩。

Experiments described in this paper show that carbon isotope composition of gaseous hydrocarbon from artificial maturation is similar to those from natural maturation.The same as that of natural gas,carbon isotope composition of pyrolyzed hydrocarbon can be used to indicate the type and maturity of organic matter in source rocks.Based on the re-sults of the experiments of thermal simulation of 8 source rock samples,the relationship between the yield of gaseous hydrocarbon,their carbon isotopic composition and the type,the maturity of organic matter in source rock is established,and then δC-value of both the pyrolyzed gaseous hydrocarbon in source rock and natural gas samples are used to study the natural gas and source rocks in Tarim and South Songliao Basins respectively.

10.11743/ogg19900303