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虚拟偏移距偏移(POM)是一种新的转换波叠前时间偏移方法,是对等效偏移距偏移(EOM) 的一种改进,它与EOM方法映射方式上虽然不同, 但本质都是相同的,都是将原始输入道集映射成为共转换散射点道集。本文主要介绍了两种偏移方法的原理,通过理论模型来验证两种方法对模型参数的敏感性。在远偏移距情况下,为了能在速度分析中得到更精确的偏移速度,分别用小排列拟合的双曲线公式、三阶近似式、双平方根旅行时公式对映射后的POM道集做动校正,从而验证了三个公式的精度。最后用POM方法对复杂构造进行了叠前时间偏移。
Virtual Offset Polarization (POM) is a new method of transition wave prestack time migration, which is an improvement on the equivalent offset offset (EOM). Although it is different from the EOM mapping method, But the essence is the same, all the original input gathers map is converted into a co-conversion scatter point gathers. This paper mainly introduces the principle of two kinds of offset methods, and verifies the sensitivity of the two methods to the model parameters through theoretical models. In the case of far offsets, in order to get more accurate velocity in velocity analysis, we use the hyperbolic formula, the third-order approximation and the double-square root travel time formula of small arrangement to map the mapped POM gathers Do motion correction, which verified the accuracy of the three formulas. Finally, the prestack time migration of complex structures by POM method is carried out.