深水水道及其沉积单元百万年尺度的演化与物源供给、海平面升降、古地形和构造运动等因素有关，海平面升降的速率对深水水道及其周缘沉积单元的类型、规模和砂体分布的控制作用未曾深入探究。以北亚特兰大盆地渐新统中央深水水道为例，基于三维地震数据体分析深水水道沉积单元地震相特征，利用90°相位转换和地层切片技术刻画深水水道沉积单元平面分布，利用分频融合技术分析沉积单元演化和砂体分布规律，建立百万年尺度下不同海平面升降速率背景的深水水道沉积模式。结果表明：早渐新世至晚渐新世依次发育砂质深水水道-末端扇复合体系、砂泥质充填深水水道-决口扇体系和泥质深水水道体系，块体搬运沉积始终伴生发育，沉积演化过程主要受全球海平面控制，可以划分为早渐新世海平面缓慢下降期、中渐新世海平面快速上升期和晚渐新世海平面快速下降期，海平面缓慢下降有利于陆源粗碎屑物质通过深水水道向大洋盆地输送，是形成砂质深水水道-末端扇-大型伴生块体搬运的重要前提，故而下渐新统砂体最为发育。

The evolution of submarine channels and their sedimentary units under a million-year scale is related to factors such as sediment supply, sea-level change, paleotopography and tectonic movements. However, the changing rate of sea level has not been deeply associated with the type, scale, and sand-body distribution of submarine channels and their surrounding sedimentary units. Taking the central Oligocene submarine channel in the northern Atlantic basin as an example, based on three-dimensional seismic data cube, seismic-facies characteristics of submarine channels with their sedimentary units were characterized. 90°-phasing transformation and stratal slicing techniques were used to depict the planar distribution of submarine channel with sedimentary units. Frequency spectral decomposition was used to analyze the evolution of sedimentary units and the distribution of sand bodies. The sedimentary model of submarine channels with changing rate of sea level at a million-year scale was established. The results indicate that from the early to late Oligocene, a composite system of sandy submarine channel-terminal fan, a composite system of sandy-muddy filled submarine channel-crevasse fan and a composite system of muddy submarine channel are developed in sequence. The mass transport deposits are always accompanied. Sedimentary evolution process is mainly controlled by global sea level and can be divided into a slow sea-level dropping period of early Oligocene, a rapid sea-level rise period of middle Oligocene and a rapid sea-level dropping period of late Oligocene. The slow sea-level fall is conducive to the transportation of coarse terrestrial clastics through submarine channels into the oceanic basin, which is an important prerequisite for the formation of sandy submarine channels, terminal fans and large associated mass transport deposits. Therefore, sand bodies are most developed in the lower Oligocene.