石油实验地质2016，Vol.38Issue(5)：692-697,6.DOI:10.11781/sysydz201605692
原油中C26－C28三芳甾烷相对含量计算方法及其应用
Determining the relative abundance of C26-C28 triaromatic steroids in crude oils and its application in petroleum geochemistry
摘要
Abstract
Triaromatic steroids (TAS) may be formed by the aromatization of regular steranes. C26-C28 TAS widely oc⁃cur in crude oils and source rocks. The C26 20R and C27 20S TAS typically co⁃elute with each other in m/z 231 mass chromatograms of aromatic fractions. Therefore, the relative abundance of C26 , C27 and C28 TAS cannot be determined by routine GC⁃MS analysis. A ternary diagram similar to that of C27-C28-C29 regular steranes cannot be established to classify oil families, which leads to the limited use of TAS in petroleum geochemistry. This paper proposed a simple method to estimate the relative abundance of homologues and isomers of TAS on the basis of the distribution patterns, origin and thermal evolution of TAS isomers. Taking representative Paleozoic oil samples from the tectonic region of the Tarim Basin as an example, this paper distinguished two petroleum populations on the ternary diagram of C26-C27-C28 triaromatic steroids determined by routine GC⁃MS analysis. The oils from the Fushan Sag in the Beibuwan Basin (South China Sea) have different distribution patterns of TAS. The oil family classification is also consistent with that by other molecular markers. For their relatively higher thermal stabilities, triaromatic steroids are generally present in significant abundance in oils and condensates with high maturity. Therefore, this ternary diagram of aromatic steroids is a potential.关键词
三芳甾烷/原油族群/色谱-质谱分析/塔里木盆地/北部湾盆地Key words
triaromatic steroid ( TAS )/oil family/gas chromatography-mass spectrometry/Tarim Basin/Beibuwan Basin分类
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张宝收,李美俊,赵青,王铁冠,张科,肖中尧,黄少英..原油中C26－C28三芳甾烷相对含量计算方法及其应用[J].石油实验地质,2016,38(5):692-697,6.基金项目
国家自然科学基金项目（41272158）和油气资源与探测国家重点实验室项目（PRP ／indep-2-1402）资助。 （）
