柴达木盆地石炭系烃源岩和煤岩生物标志物特征及其地球化学意义

采自柴达木盆地东北部石炭系烃源岩和煤岩的生物标志化合物研究表明,研究样品的有机质演化已达高成熟阶段,其母质来源以水生生物为主,同时有较丰富的陆源物质输入。除煤岩的沉积古环境较氧化且经历过较强的降解过程外,其余样品的沉积古环境均属于较还原环境,沉积介质为咸水环境,有机质总体丰度高。因此该区石炭系海陆交互相含煤沉积是一套较一般侏罗系为好的烃源岩系,有较好的生烃潜力。

Biomarkers and Geochemical Significance of Carboniferous Source Rocks and Coals from Qaidam Basin

On the basis of biomarkers in Carboniferous source rocks and coals from the northeastern portion of Qaidam basin, it can be seen that these samples have reached high maturation stage during their thermal evolution, and the organic sources are mainly from aquatic organisms combined with abundant terrigenous input. Apart from SH-79 coal sample formed in more oxidizing environment, most of samples in this study deposited in reducing environment with saline water with medium and high content of total organic matter. Thus, the Carboniferous paralic coal-bearing stratum is a set of excellent source rock measures with much better hydrocarbon generation potential than Jurassic source rocks.