海相镜质体——海相烃源岩中一种重要生烃母质

MARINE VITRINITE—AN IMPORTANT HYDROCARBONSOURCE MATTER IN MARINE SOURCE ROCKS

应用现代有机岩石学与有机地球化学相结合的方法，通过对我国海相烃源岩的研究，确认了一种新的显微组分——海相镜质体。这种显微组分源于动物有机质，在还原—强还原条件下，经强烈生物降解作用形成。人工热模拟实验表明，海相镜质体成烃较晚，主成油期在镜质组Ｒｒ１．０％～１．３０％范围内，产油率高达６％～８％，并以气态烃为主。

On the base of detailed research on marine source rocks in China by means of organic petrology and geochemistry, a new maceral marine vitrinite has been confirmed. This maceral origins from faunal organic matter, were formed through the strong biochemical degradation of bacterials under the reducing to strong reducing conditions. Thermal simulating test results showing that marine vitrinite is characterized by late hydrocarbon generation, and its oil peak occurs in the region of vitrinite R o 1 0%￣1 30%. Marine vitrinite is a good gas source material although its liquid hydrocarbon production is about 6%￣8% of its total weight. The reflectance of marine vitrinite can be used as a good maturation level index after high maturation level stage.