引言 在石油勘探中,有机地球化学的对比分析愈来愈多地应用质谱法来鉴别原油和生油岩中的特征组分,并确定其丰度。饱和的四环和五环烃类(甾烷和萜烷)常常被选为分子级水平的对比参数。这些通常所说的生物标记烃类,由于它们的特征质谱碎片,即使在低 INTRODUCTION In petroleum exploration, comparative analysis of organic geochemistry has increasingly applied mass spectrometry to identify and characterize components in crude and source rocks. Saturated tetracyclic and pentacyclic hydrocarbons (steranes and terpanes) are often selected as molecular-level contrast parameters. These commonly referred to as biomarker hydrocarbons, due to their characteristic mass spectral fragmentation, even at low