中文摘要：

以前人大量研究成果为基础,综合利用钻井、地震等资料,对万安盆地构造-沉积充填演化进行了研究,重点分析了万安盆地烃源岩、储集层和圈闭等油气地质特征和成藏条件。研究认为,万安盆地在新南海构造旋回中经历了渐新世—早中新世的伸展断拗、中中新世的走滑改造、晚中新世—现今的区域沉降等3个构造演化阶段,其中晚渐新世—早中新世发育三角洲—半封闭海湾沉积体系,中中新世—现今发育三角洲—正常开阔海沉积体系。万安盆地发育渐新统和下中新统2套主力r烃源岩、渐新统—中新统碎屑岩和中新统碳酸盐岩2类主要储集层以及渐新统—中新统层内局部盖层和上新统—第四系区域性盖层,发育构造和生物礁2类油气藏,具有＂自生自储＂和＂下生上储＂2类成藏模式。新南海构造旋回对万安盆地油气成藏有重要控制作用,其中伸展断拗期控制盆地主力烃源岩（主要分布于北部坳陷和中部坳陷）的发育以及盆地西侧砂岩储层和构造圈闭的形成,走滑改造期控制盆地中东部碳酸盐岩储层和碳酸盐岩建隆的形成,同时所形成的深大断裂沟通了深部烃源岩。

英文摘要：

Based on many previous research achievements, drilling and seismic data, tectonic evolution and sedimentary filling of Wan＇an basin are studied, especially focusing on hydrocarbon geological characteristic of source rocks, reservoirs, traps, and accumulation conditions. Results show that Wan＇an basin experiences three tectonic evolution stages in the tectonic cycle of Neo-South China Sea（SCS）：Oligocene—Early Miocene extensional fault-depression stage, Middle Miocene strike-slip reformation stage, and Late Miocene—Quaternary regional susidence stage, in which delta and semi-enclosed bay sedimentary systems develop in Late Oligocene—Early Miocene, delta and open sea sedimentary systems develop in Middle Miocene—Quaternary. Two sets of Oligocene and Lower Miocene main hydrocarbon source rocks, two main reservoirs of Oligocene—Miocene clastic rocks and Miocene carbonate rocks, the local cap in the inner layer of Oligocene—Miocene and Pliocene—Quaternary regional cap develop in Wan＇an basin. Two reservoir types of reef and structure develop with the characteristics of lower-generation and upper-preserving, and self-generation and self-preserving. Wan＇an basin＇s hydrocarbon accumulation is affected by the tectonic cycle of Neo-SCS significantly, in which extensional fault-depression stage controls main source rocks（mainly in North and Central depressions）and sandstone reservoir and structural traps in western Wan＇an basin, strike-slip reformation stage controls carbonate reservoirs and carbonate buildups in eastern wan＇an basin, while deep faults formed in this stage connect the deep source rocks.