中文摘要：

根据生物标志化合物组合特征,珠江口盆地番禺低隆起凝析油可分为A类油和B类油,其中A类油又可分为A1类油和A2类油.A类油以高丰度双杜松烷和C19三环萜烷、高Pr/Ph比值、较高丰度奥利烷、低丰度C304-甲基甾烷为特征,表明有机质主要来源于高等植物,可能与恩平组沼泽组、河流相及滨-浅湖相烃源岩有烃源关系;而A1类油C27重排甾烷丰度较低、C29规则甾烷丰度较高,可能来源于恩平组沼泽相和河流相煤系烃源岩,A2类油C27重排甾烷丰度较高、C29规则甾烷丰度较低,可能来源于恩平组滨-浅湖相泥岩.B类油具一定丰度C304-甲基甾烷,C27重排甾烷丰度高,C19三环萜烷、奥利烷和双杜松烷丰度低,高等植物输入标志不明显,但Pr/Ph比值高,综合分析认为B类油主要为文昌组浅湖相泥岩的贡献.以往认为珠江口盆地原油主要来自文昌组中-深湖相泥岩,本文研究结果对在珠江口盆地寻找恩平组沼泽相、河流相及滨-浅湖相和文昌组浅湖相来源的凝析油气具有重要意义.

英文摘要：

Condensates in Panyu Low Uplift, Pearl River Mouth basin, can be divided into Type A and B,with Type A into Sub-type A1 and A2, according to their biomarker combinations. Type A condensate is characterized by abundant bicadinanes and C19 tricyclic terpanes, high Pr/Ph ratios, relatively abundant oleanane and less C304-methylsteranes, indicating that the organic matter could derive from terrigenous higher plants and correlate with source rocks of swamp, river and shore-shallow lacustrine facies in Enping Formation. Subtype A1 condensate should derive from coal measure source rocks of swamp and river facies in Enping For mation because of its relatively lower abundance of C27 Diasteranes and higher abundance of C29 normal steranes, and Sub-type A2 should derive from mudstone of shore-shallow lacustrine facies in Enping Formation because of its relatively higher abundance of Ca7 Diasteranes and lower abundance of O29 normal steranes. Type B condensate contains some C30 4-methylsteranes, abundant C27 Diasteranes and less bicadinanes, oleanane and C,9 tricyclic terpanes, showing no significant markers of higher plants, but has high Pr/Ph ratio. Therefore, it can be considered that Type B condensate may come from mudstone of shallow lacustrine facies in Wenchang Formation. In contrast to the old conclusion that most oil in Pearl River Mouth basin has derive from mudstone of medium-deep lacustrine facies in Wenchang Formation, this paper＇s results are very important to exploring for condensates sourced from swamp, river and shore shallow lacustrine facies in Enping Formation and shallow lacustrine facies in Wenchang Formation in the basin.