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通过对我国松辽盆地原油和源岩的地球化学研究,发现在朝长地区低熟原油和源岩中具有相对较为丰富的C_(31)甾烷,根据它们的保留位置和质谱特征,推断它们的结构为4,22,23,24-四甲基甾烷,同时,共检测出10个4,22,23,24-四甲基甾烷化合物的异构体.由于4,22,23,24-四甲基胆甾烷在侧链上有3个甲基基团,因而它们的热稳定性较差,主要出现在低熟原油和源岩中.C_(31)甾烷通常出现在水体盐度较高的环境中,指示了某些特殊含盐度较高藻类的生源贡献.它们的生源可能为一些甲藻如:G.foliaceum和P.foliaceum中的4-甲基的22- 环丙基的甾醇,在成岩作用过程中演化而形成.此外,C_(31)凿烷还可作为良好的生源和环境标志物,帮助进行油源对比.
Based on the geochemical study of crude oil and source rocks in the Songliao Basin in our country, we found that there are relatively abundant C 31 steranes in low-maturity crude oil and source rocks in the Asahi-Changchu area, and they are deduced from their conservation positions and mass spectral features The structure of 4,22,23,24-tetramethyl steranes, at the same time, detected a total of 10 4,22,23,24-tetramethylsterane compound isomers due to 4,22,23, 24-tetramethylcholestane has 3 methyl groups in the side chain, so their thermal stability is poor, mainly in low-mature crude oil and source rock.The C 31 sterane usually appears in water The higher salinity environment indicates some of the biogenic contributions of higher salinity algae, which may be derived from some dinoflagellates such as the 4-methyl 22-ring in G.foliaceum and P.foliaceum Propyl sterol, which evolved during diagenesis. In addition, C_ (31) hematite can also be used as a good biomarker for biogenesis and environment to aid in oil source correlation.