对于开发比较成熟的区块, 利用多种已钻井的VSP 速度, 结合精细的速度处理结果, 可以比较准确的预测速度, 达到较小的预测误差 但是对于海上探井较少或是勘探新区而言, 速度预测结果就存在较大的误差-For the development of mature blocks, using a variety of well VSP speed, combined with fine speed of processing results, can be more accurate prediction of velocity, to achieve a smaller prediction error　but for offshore exploration well less or it is new exploration areas, speed forecasting result is put in bigger error