利用GC/MS分析技术在塔5井、官77井和狮23井下第三系陆相咸水沉积物样品中检测到了丰富的Δ5-甾醇类化合物,并对其进行了定性研究,鉴定出19个化合物,碳数范围为C23—C31,丰度最高的化合物为24-乙基胆甾-5-烯-3β醇,占甾醇总量的75%左右。样品的母质类型及甾醇的分布特征表明,样品中丰富的C29甾醇可能主要来自于咸水环境中的某种藻类而非陆源物质。 The abundance of Δ5-sterols was detected by gas chromatography-mass spectrometry (GC / MS) in Tertiary continental terrestrial salt water samples from Well T5, Well Guan77 and Well L23, and qualitative analysis was carried out to identify 19 compounds , The carbon number range is C23-C31, and the most abundant compound is 24-ethylcholest-5-ene-3βalcohol, accounting for about 75% of the total amount of sterols. The parent material type of the sample and the distribution of sterols indicate that the abundant C29 sterols in the sample may be mainly from some algae rather than terrestrial materials in the salt water environment.