Abstract：Seismic reflections of the structure X in the depression D in the deep water area of the western South China Sea is characterized by bright spots with low frequency and strong amplitude of targets.So there is no reference for the hydrocarbon detection due to the lack of well data (only one dry well drilled) in the area.Therefore,a fluid identification based on forward modeling is proposed.First,target velocity and other parameters are calculated when velocity calculated by Wyllie formula based on logging data is consistent with prestack seismic velocity.Then,geological models are established by multi-point controls and a forward modeling is carried out and compared with seismic sections to achieve the fluid identification.This proposed approach is used to a new area (no or very few wells) and some significant discoveries are obtained by drilling,which shows validity and practicability of the proposed approach.
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