在珠江口盆地白云凹陷,11.7～l0.5Ma发育有浅层水道.在主水道中识别出三期次一级的水道.三期水道内部充填结构简单,第一期水道以侧积为主,第二期和第三期水道以加积为主.在相干体基础上做沿层切片来反映三期水道的整体形态,这三期水道的平面形态不同,第一期水道往下游逐渐变宽,第二期水道基本顺直,第三期水道往下游逐渐变窄.通过三期水道的时空演化可以看出,该水道整体上是从西向东迁移.水道的发育主要是受到古地形的影响,此外,海平面变化和沉积物供给是控制该水道发育的重要因素.

The 11.7-10.5Ma Shallow-water channels are developed in Baiyun Sag, Pearl River Mouth Basin. Three phases of the secondary channels are identified in main channels. These secondary channels are of simply filling architectures. The fillings of the first phase channels are characterized by lateral accretion and the fillings of the second and the third phase channels by aggradation. Based on the coherence cubes, the entire shapes of the three phases of channels are reflectd by the thin sections along a layer. These phases of channels display different plane shapes. The first one is getting wide to down stream, the second one is nearly straight, and the third one is getting narrow to down stream. In the spatial and temporal evolutions, the three phases of channels show that the main channels generally migrate from the west toward the east. The development of channels is closely affected by the paleotopography. Besides, sea level changes and sediment supply are the important factors influencing development of the channels. This research result of the shallow-water channels is helpful to improve the research of deep-water channels.