Through analyzing the relations between petroleum discoveries and distributions of the favorable facies zones

local structures

faults and fractures

this paper studied the main factors controlling hydrocarbon accumulation in combinition with statistical analysis of the relationship between formation test data and sand thickness

reservoir property and logging data.The results show that favorable sedimentary microfacies zones

local structural setting

and faults

&

fractures are the three major factors controlling hydrocarbon accumulation.Hydrocarbon mainly accumulate in the underwater distributary channel sands of the delta front.The high of NW-SE-trending broad nose structure is the favorable place for hydrocarbon accumulation.The vertical and high-angle heterotropic fractures are the main effective factures in the study area.Faults and fractures control hydrocarbon accumulation.The discovered pools with a great amount of reserves are mainly distributed near the F

2

and F

3

fault zones with large fault displacement.The sandbodies of underwater distributary channel subfacies with well-developed faults and fractures in the local nose structures in the southeastern part of the study area are the the most favorable targets for further exploration.