Based on the integrated analysis of 3D and 2D seismic

well-logging and paleontological data

two second-order sequences(CS1 and CS2)

eight third-order sequences(S1-S8)

as well as three main depositional systems(unidirectio-nally-migrating channels in continental slope

shelf margin clinoforms

and shelf-edge deltas) have been recognized in the northeastern shelf edge of the Pearl River Mouth Basin.From outer shelf to lower slope

four types of continental slope channels can be identified:(1) the partly confined outer-shelf unidirectionally migrating composite channels;(2) the broad and shallow outer-shelf to shelf-break erosional composite channels that are unconfined or partly confined;(3) the confined and deeply incised unidirectionally migrating slope channels with vertical and lateral accretion;(4) the U-shaped and unconfined or partly confined vertical accretional composite channels in lower slope.In addition

in view of characteristic variations of sequence boundary

sequence architecture

and depositional system

two types of compositional models of the system tracts have been concluded:(1) the one mainly composed of widespread shelf-margin unidirectio-nally-migrating channels in the Yuehai and Wanshan Formations

which are quite different from the EXXON sequence model;(2) the one that consists dominantly of the Quaternary high-angle shelf margin clinoforms and slope channels.The sequence architecture and depositional evolution in the continental slope in the study area are controlled by a combination of different factors

such as sea level change

tectonism

subsidence rate

and sediment supply.