Geochemical evolution of kerogen type III during hydrous pyrolysis: A case study from the Damoguaihe Formation, Hailar Basin, China

In order to evaluate changes in geochemistry, organic petrology, and chemical composition of petroleum and byproducts, an immature sample from the Damoguaihe Formation in Hailar Basin in China was examined using hydrous pyrolysis (HP) at the following temperature steps: 300 & DEG;C, 325 & DEG;C, 350 & DEG;C, 365 & DEG;C, 400 & DEG;C, and 450 & DEG;C. The final product from each pyrolysis step was assessed with several analytical methods including programmed pyrolysis, Gas Chromatography (GC), Gas Chromatography-Mass Spectrometry (GC-MS) and organic petrology. Rock-Eval pyrolysis revealed that the geochemical parameters including TOC, S2, HI, and Tmax changed as thermal maturity advanced. Both un-extracted and extracted organic matter (OM) showed a steady decrease in TOC, HI, and OI as the temperature increased. On the other hand, a general increase in Tmax values with increasing temperature was observed. Regarding GC analysis, fluctuations were observed in n-alkanes during pyrolysis. In general, lower molecular weight n-alkanes of 更多