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椭圆展开共反射点(CRP)方法可以获得比常规倾角时差校正(DMO)方法更近似的零偏移距时间剖面和相应CRP速度场.大量研究和实践证实,在非均质性较弱的地区,该方法取得的成果显著.但由于该方法没有考虑速度的横向变化和转换波等情况,当地下介质存在较强非均质性时,该方法不再准确,需要引进反映速度横向变化的双参数(上行波与下行波的平均速度和速度比)进行改进.本文详细推导了引入双参数后的叠加和速度分析算法,并通过数值模型和地震资料处理证实,修正后的算法可以更好地解决地质复杂地区速度建模和叠加成像问题.
Elliptical Unfolded Total Reflectance Point (CRP) method can obtain more approximate zero offset time profile and corresponding CRP velocity field than the conventional dip and time difference correction (DMO) method.Many researches and practices have proved that in the region with less heterogeneity However, this method does not consider the lateral change of velocity and converted wave, so this method is no longer accurate when there is a strong heterogeneity in the local medium, so it is necessary to introduce double Parameters (average speed and speed ratio of up-going wave and down-going wave) are improved.This paper deduces the algorithm of superposition and velocity analysis after introducing two parameters in detail, and through the numerical model and seismic data processing, the modified algorithm can better Solve the problem of speed modeling and overlay imaging in complex geological areas.