深度成像已经成为P波数据的重要工具。从最近的研究来看 ,深度成像对转换波资料更为重要。叠前深度偏移虽然是最好的成像方法 ,但不足之处是要求有精确的初始速度模型 ,否则 ,深度偏移的结果还不如时间偏移好。WangWeizhong和LongD .Pham等提出了一种转换波叠前成像和速度分析的新技术———拟偏移距偏移法 (POM )。这种方法与等效偏移距法 (EOM )不同的地方是对偏移距的定义不同。POM法可以更精确地计算初始速度 ,同时还可以简化转换波处理流程 Depth imaging has become an important tool for P wave data. From the recent research, depth imaging is more important for converted wave data. Although prestack depth migration is the best imaging method, the disadvantage is that a precise initial velocity model is required. Otherwise, the result of depth migration is not as good as time migration. Wang Weizhong and Long D. Pham et al. Proposed a new technique called Pseudo-Offset Offset (POM), which is a new technique to transform the pre-stack imaging and velocity analysis. This method differs from the equivalent offset method (EOM) in the definition of offset. POM method can more accurately calculate the initial velocity, but also can simplify the conversion wave processing flow