【摘要】 油气勘探实践证明,陆相湖盆浅水三角洲是岩性油气藏勘探的重要目标之一。基于对我国多个陆相湖盆的系统研究,发现陆相湖盆浅水三角洲大量发育于坳陷盆地中,同时断陷盆地萎缩期也可发育。沉积体系特征受地形条件、水体深度、沉积基准面升降旋回、物源供给、气候变化及盆地构造运动6大因素控制。以岩性、垂向沉积相组合、古生物、地震及测井4种浅水三角洲识别标志,将其分为6种成因-结构类型:冲积扇供给物源,发育于断陷湖盆初始裂陷期及前陆湖盆初始形成期的毯式、吉尔伯特式浅水扇三角洲;辫状河供给物源,发育于坳陷湖盆初始形成期的短轴两侧、前陆湖盆和断陷湖盆萎缩充填期的缓坡背景下的毯式、吉尔伯特式辫状河浅水三角洲;曲流河供给物源,发育于坳陷盆地的毯式、吉尔伯特式曲流河浅水三角洲。更多还原

【Abstract】 In recent years,shallow delta in continental lake basin has been proved to be one of the important targets of exploration for litho-hydrocarbon reservoirs.According to the systematic researches of the continental lake basin in our country,we found that most of the shallow deltas in continental lake basin were developed in the depression basins,a few could also grow in the shrinking period of the signs.Depositional system features are controlled by such 6 factors as terrain condition,water depth,elevation and subsidence of deposition base level,supply of material source,climatic change and the basin tectonic movement.Also,we recognized that the shallow-water delta was affected by 4 kinds of signs.Depending on Postma’s Delta classification in 1990,we summed up 6 cause-structure types of shallow delta in continental lake basin.Different division methods are given for both depression basins and basins due to the different sedimentary system features.Rivers,shallow deltas and continental basins together make up the depositio-nal system of shallow delta in continental lake basin,which always form the excellent source-reservoir-seal assemblages.更多还原