【摘要】 本文对南沙及其邻近海区表层样品中甾、萜类化合物进行了研究。沉积物中可溶有机质饱和烃组分GS-MS分析,检测出丰富的甾、萜烷。甾烷和五环三萜烷的相对丰度和构型特征表明,沉积物中可溶有机质经历了一定的演化,具有丰富的"地质型"甾萜烷,一些样品的成熟度参数反映出有机质演化已进入生油门槛。笔者认为这种现象是由于原生有机质在特定的物化条件下(温度、压力和粘土矿物催化)演化形成,与石油烃污染和再造有机质并无明显关系。更多还原

【Abstract】 The distribution of steranes and pentacyclic triterpanes in the Nansha sea area modern sediments has been examined by gas chromatography-mass spectrometry.The stereochemical parameters of steranes and pentacyclic triterpanes in the soluble organic matter show an abnormal abundance of "geolipids" isomers.These results show that these steroid and triterpenoid hydrocarbons in surface sediments do not result from fossil fuel pollution and reworked components,which are dependent on the evolutionary features of the original soluble organic matter.更多还原