【摘要】 根据钻井岩心、测井、地震和古生物等资料,对瓯江凹陷古近系地层的沉积相类型和沉积演化特征进行了系统分析。结果表明,瓯江凹陷古近系发育三角洲相、扇三角洲相、湖泊相、滨海相和浅海相5种沉积相类型。根据该区构造演化特征和沉积充填特征,可将瓯江凹陷古近系沉积演化分为3个阶段:早古新世断层开始活动,形成了凹陷雏形,总体发育三角洲—湖泊—扇三角洲沉积体系;中—晚古新世断裂活动由鼎盛逐渐向衰弱转化,凹陷发育三角洲—滨海—浅海—扇三角洲沉积体系,至晚古新世末期闽浙隆起区物源的三角洲沉积体系发育规模进一步扩大;始新世凹陷处于东海盆地坳陷环境中,发育三角洲—滨海—浅海沉积体系。更多还原

【Abstract】 Data from cores,well logs,paleontology and seismic survey have been comprehensively studied in this paper to reveal the evolutionary history of the Oujiang Sag in the Paleogene.Sedimentary facies,such as deltaic,fan deltaic,lacustrine,coastal and shallow marine facies were recognized.The tectonic evolution and filling history of this region in the Paleogene can be divided into three stages.In the early Paleocene,the prototype of the sag was formed by faulting and filled with deltaic-lacustrine-fan deltaic depositional systems.During the stage from the middle to late Paleocene,with the gradually weakening of the faulting activity,deltaic-coastal-shallow marine-fan deltaic depositional systems were developed.By the end of the late Paleocene,deltaic deposition prevailed due to the expansion of the Fujian uplift.In the Eocene,deltaic-coastal-shallow marine depositional systems were well developed owing to the depression of the sag.更多还原