Abstract:The trap identification in Dongying Depression is rather difficult because of complex seismic response characteristics of near-shore subaqueous fan.To solve this problem,we analyze sedimentary styles of glutenite in near-shore subaqueous fan based on a flume simulation experiment,and define seismic response characteristics with 3D forward modeling.It is found that multi-source near-shore subaqueous fans can be divided into four sub-facies such as root-fan,middle-fan,edge-fan,and inter-fan.Microfacies changes of the four sub-facies result in different types of structures and lithologic traps.Different traps correspond to different seismic response characteristics.Therefore,a seismic response-characteristics plate based on facies changes is established for the identification of different traps.In addition,it is found that the consequent deposition along a bedrock surface in the time-domain seismic data is caused by pitfall of high-velo-city of glutenite.The true occurrence of fan bodies is structurally inclined.This viewpoint can reasonably explain the oil-water relationship of reservoirs and provide a reference for the exploration of similar near-shore subaqueous fan reservoirs.
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