Shelf-margin delta

an important type in the dynamic classification of delta

has become the focus of science researches and hot spot in oil & gas exploration.According to the driving factors

shelf-margin delta can be categorized into two types

namely sediment supply-driving delta and accommodation-driving delta.The Pearl River Mouth Basin had favorable geological condition for shelf-margin delta development at 21 Ma and 13.8 Ma.Shelf-margin deltas(21 Ma and 13.8 Ma)are analyzed in respects of topography

relative sea-level change and sediment supply through integration of well logging

logging curves and seismic data.The forming condition analysis shows that the delta at 21 Ma is of sediment supply-dri-ving type

while the delta at 13.8 Ma is of accommodation-driving type.Although SQ2 and SQ9 are obviously different in respects of topography

relative sea-level change and sediment supply

they both are type I sequences

and have well-developed lowstand fans

shelf-margin delta and delta-front slumping deposits

which belonging to stable shelf-margin deltas.