Based on substantial cores

drilling data

well logging

2-D and 3-D seismic data

the geometry

facies associates

depositional phases

distribution and evolution of the large-scale high-amplitude seismic reflection package in the 1st member of the Huangliu Formation of Dongfang area were studied.In addition

characteristics of the favorable reservoirs was revealed and its significance in hydrocarbon exploration was discussed.Finally

the exploration strategy of Dongfang area was suggested.The results show that the large-scale high-amplitude reflection packages were gravity flow fan deposit.It consists of turbidite channel fill

overbank deposits and levee.Furthermore

it can be subdivided into three phases vertically.From the first phase to the third

the fan size increased gradually

while the fan migrated toward northwest step by step

with concurrent movement in the direction of southeast.Turbidite channel sand fill bodies are the most important reservoirs in Dongfang area proved by drilling

which were widely distributed and three-phases superimposed.The overpressure played an important role to improve reservoir properties in the 1st member of the Huangliu Formation in Dongfan area.There are mainly updip pinchout lithologic reservoirs in the flaps of diapiric domes

and lenticular sandstone lithologic reservoirs in western Dongfang area which is not associated with diapiric domes.Both of them are associated with the large-scale high-amplitude reflection and have very great exploration potential.