Based on the analysis of regional tectonic evolution

structural unit division and characteristics of strata development

the reservoirs

hydrocarbon pooling conditions and main controlling factors were studied to set up pool-forming models in the east of the Maichen Sag of the Beibu Gulf Basin.The Paleogene Liushagang and Weizhou formations (El and Ew respectively) are the dominant oil-bearing formations which include four sets of reservoir-seal combinations;the dark mudstone in the El

2

and the upper El

3

are the main source rocks;the El

3

and Ew are two important sandstone reservoirs.The traps are mainly faulted nose

faulted block and stratigraphic overlap traps with good timing and spatial configurations.The predominant factors controlling pool-forming could be mature source rocks

reservoirs development

fault features

sealing conditions

configuration of traps and their workable degree.There are three hydrocarbon pooling models

including the inner-slope zone in the deep sag

fault bench in the south

outer-slope and far slope zone.The western part of inner slope zone is the most favorable area for further exploration.