AVO分析对时差校正的误差是敏感的。为了降低时差中的误差,可用时窗来估算AVO效应。在每一个时窗,用块状-NMO校正可避免NMO拉伸,剩余NMO校正则由迭代互相关技术完成。将时差校正时窗中的数据模拟成恒定脉冲乘上一个振幅函数,该振幅函数则通过随偏移坐标变化的多项式来近似。因而,数据避免了由偏移距到角度或慢度的转换。用最小二乘法可求出地震脉冲和多项式系数。该方法是可 AVO analysis is error-prone for time-of-flight correction. In order to reduce the error in the time difference, time window can be used to estimate the AVO effect. At each time window, NMO stretching is avoided with bulk-NMO correction and the remaining NMO correction is done by an iterative cross-correlation technique. The data in the time difference correction window is modeled as a constant pulse multiplied by an amplitude function that is approximated by a polynomial that varies with offset coordinates. Thus, the data avoids the transition from offset to angle or slowness. Seismic pulse and polynomial coefficients can be found by least square method. This method is acceptable