Nanpu depression in Bohai Bay Basin has large petroleum exploration potential

and most of the reservoirs discovered in the depression are of structural type.However

the distribution pattern of petroleum resources is still unclear

so it is diffficult to effectively develop petroleum exploration.Geofacies

fluid potential and hydrocarbon kitchen are believed to be main factors controlling hydrocarbon distribution in Nanpu depression.Geofacies controlls hydrocarbon distribution by "favorable facies combined with high porosity and permeability" pattern

fluid potential controlls by "low potential" pattern

and hydrocarbon kitchen controlls by "near source" pattern.Based on these patterns

we established a comprehensive hydrocarbon accumulation model of "near source-favorable facies-low potential"

which was applied to predict petroleum accumulation distributioin in Nanpu depression.Potential anticlinal reservoirs may occur in the first-order favorable area in Beipu structural belt and the second-order favorable area in Nanpu No.4 structural belt

whereas potential fault-block reservoirs may occur in the second-order favorable area in Beipu structural belt

second-order favorable area in Nanpu No.3 structural belt

second-order favorable area in Nanpu No.4 structural belt and third-order favorable area in Nanpu No.5 structural belt.