Abstract: There were few drill wells in Qiongdongnan basin,which affected the accuracy of reservoir prediction.In order to solve this problem,the authors applied virtual?well technique to reservoir prediction of drilled A?1 gas bearing structure in the southern part of Lingshui sag in the deep?water area of Qiongdongnan basin,which verified that the virtual?well technique is reasonable.The authors also summarized experience values of wave impedance of the reservoir in A study area.The experience values were used to predict the reser?voir of A?2 structure to be drilled.The prediction of A?2 structure coincides with the drilling result,which confirmed that the virtual?well technique is of high feasibility in predicting the exploration targets in the deep?water area of Qiongdongnan basin.