Based on the interpretation of seismic profiles，slices and attributes，lateral accretion packages(LAPs) were found in Dongfang 1-1 area of the Yinggehai Basin in northern South China Sea. According to their sinuosity，LAPs can be categorized into high or low sinuous types，which are both characterized by a series of shingled reflections on seismic profiles. However，in the plan view，the high sinuous type is represented by a scrollbar pattern while the low sinuous type is ribbonlike.The LAPs are suggested to be formed by multiple stages of “cut-fill” as well as the subsequent lateral migration. The lower part of LAPs are consisted of coarsegrained reservoir resulting from the amalgamation of channel axis bottom deposits，which have good lateral connectivity and reservoir potential.However，it turns upwards into the combination of sandstones interbeded with mudstones，leading to a low lateral connectivity and quality.The discovery of the LAPs is significant to understand the nature of the deepwater gravityflow systems and also provides potential targets for the hydrocarbon exploration in the study area.

The present day Qiantang River(QR)estuary is a worldfamous tidedominated estuary，and is one of the most sensitive areas for postglacial global sealevel changes in China.Filling of the QR incised valley was initiated by marine inundation during the transgression after the Last Glacial Maximum and has continued during the Holocene sealevel stillstand.From bottom to top it could be grouped into five sedimentary facies: Fluvial channel，floodplain，paleoestuary，offshore shallow marine，and presentday estuary.The QR incised valley deposits occur as a relatively complete type I sequence with the sequence boundary，initial flooding surface，maximum flooding surface，tidalravinement surfaces and tidalerosion surfaces welldeveloped.Filling of the QR incised valley consists of four longitudinal segments: Seaward segment，offshore segment，the third segment and innermost segment，each of which is characterized by a distinct stratigraphic succession，and different degrees of marine and fluvial influences.This is the first time the paleoestuary facies has been recognized，formed about 9000 a BP. It has a distinct sedimentary succession from the presentday estuary，and is characterized by a large number of tidalchannel sand bodies flanked by mudflats and saltmarshes in the landward part of estuary，passing headward into the tidalfluvial channel.The presentday estuary is mainly composed of baymouth sediments，as well as a complex of tidal sand ridges and channels at the mouth，followed headward by a silty bar，which passes landward to a single tidalfluvial channel.The sediments of paleoestuary present a coarse-fine-coarse seaward pattern.By comparison，the deposits of presentday estuary show a coarse-fine-coarse-fine pattern from land to the sea，which is in general similar to the grainsize distribution in tidedominated estuaries，but a significant difference exists in that the baymouth sediments of the presentday estuary are muddominated.