中文摘要：

针对白云深水区渐新世陆架边缘三角洲沉积规律尚不明确的问题，根据沉积学理论，结合测井、地震、岩心资料，在分析研究区珠海组陆架边缘三角洲沉积微相特征的基础上，对其内部结构和期次划分进行探讨，揭示了此类沉积体系垂向动态演化特征并建立演化模式。研究发现，研究区陆架边缘三角洲具有前积层厚度大、发育深水遗迹化石、伴生发育海底扇等特征。依据地震剖面上前积结构样式的不同，由底至顶可划分为4期，第1期受断裂坡折影响，三角洲前方的海底扇发育；后3期受沉积坡折影响，第2期沉积期物源供应充分，沉积范围较第l期大；第3期沉积期海平面上升到最大，其范围及其前方滑塌规模均最小；第4期沉积期海平面又发生大规模下降，三角洲前方的滑塌发育规模最大。该研究丰富了中国渐新世陆架边缘三角洲沉积体系的认识，可为深水区的油气勘探提供借鉴。

英文摘要：

Aiming at the problem that the deposit rule of the Oligocene continental shelf margin delta in deep water area of the Baiyun sag is still not distinct, based on sedimentology theory, eombining well logging, seismic data and cores, on the basis of analyzing the deposit microfacies of the continental shelf margin delta of the Zhuhai Formation in the study areal we studied its internal structure, divided its evolution stages, revealed the dynamic evolution fea- ture of such deposit system, and established its evolution model. The study resuhs show that the continental shelf margin delta of the study area is featured with thick foreset bed, developing deep-water trace fossils, and being as- sociated with submarine fans etc. According to different foreset structure styles on seismic sections, it can be subdi- vided into four stages from bottom to top intervals ： （ 1） stage I ： being affected by fault slope break, the submarine fans are well-developed in the delta front; （2） stage II： there was adequate deposit material supply during this stage, and the deposit scope was bigger than that of stage I ; （ 3 ） stage III： sea level rose to the highest during this stage, and its scope and its front slump scale were the smallest ; （4） stage IV ： sea level dropped significantly dur- ing this stage, and the slump scale in front of the delta was the biggest. This study enriches the understanding of delta depositional system of Oligoeane continental shelf margin in China, and can provide reference for oil and gas exploration in deep water regions.