【摘要】 用能谱和GC/MSD对两块来自涩北1井(900m和1200m)钙质泥岩的研究表明,研究样品中细菌遗骸骨特征明显并检测出微生物特征生标(角鲨烷和2,6,10,15,19-五甲基-二十烷),表明涩北1井研究层沉积岩中微生物发育;微生物的降解作用明显改变了常规生物标志物的分布特征:低演化源岩的正构烷烃首先遭降解,出现OEP2>>OEP1特征、甾烷异构化参数C29ββ/(ββ+αα)和Σ8,14-断藿烷/Σ藿烷比值比正常热演化样品出现异常高值。这些参数可能作为判识低演化沉积有机质是否曾遭受微生物降解,同时可间接判识是否有生物气产生的有力依据。更多还原

【Abstract】 Investigation of the energy spectrum and GC/MSD for two pieces of calcilutites from the Sebei Well 1 in Caidamu Basin indicates that they are of obvious remaining bone of bacterium in these samples and there are the microbial characteristic biomarkers(aqualane and 2,6,10,15,19-pentanethyl-eicosane).For there are some bacterium-germs in the sedimentary rock of the Sebei well 1; The degradation of bacterium-germs has greatly changed the characteristic of distribution of the regular biomarkers: the alkane of the low-evolutionary rocks has been degraded firstly and represent the characteristic of OEP2>>OEP1, the ratio of C29ββ/(ββ+αα)and Σ8,14-secohopane /Σhopane is unusually higher than the normal evolutionary samples in hydrothermal stage. These parameters may judge low-evolutionary sedimentary organic matter whether is degraded or not by bacterium-germ, at the same time they can indirectly judge whether it is biogas or not.更多还原