Abstract:

The Neogene in Huizhou Depression were deposited in neritic shelf environment and is gentle in dip.However,a comprehensive study of seismic,drilling,log data indicates that three types of slope-breaks (i.e.deposition breaks,fault breaks and flexural breaks) occur in the area.On the plane,these breaks combine with one another in four patterns,including multistage,diagonal,comb-shaped,and ridge-parallel.Their evolution presents such evident features as inheritance,periodicity,scale grading,and migration cyclicity.Slope-breaks in the north margin and south of the basin control the superimposing pattern of the sequences and the development and spatial distribution of depositional systems.

Key words: shelf slope-break, low stand system tract, stratigraphy, depositional system, Huizhou Depression, Pearl River Mouth Basin