一种改进的P SV转换波静校正方法

An improved static correction method of converted P-SV wave

（成都理工大学信息工程学院，四川成都610059）

College of Information Engineering, Chengdu University of Science and Technology, Chengdu 610059, China

P SV转换波静校正一直是转换波处理中的一个难题。对这个问题的解决方法有多种，当地下构造平缓时，共接收点叠加道集相干算法是一种有效的方法，但是当地下构造倾斜或者较为复杂，该方法就失去了成立的前提，不能计算出正确的静校量。通过理论上的推导和试验，发现通过改进其计算公式，可以使该方法应用到复杂地下构造地情况下。为此对这种改进的共接收点叠加道相干算法进行了详细的阐述。算法可以分3步进行：①估算静校正量；②在共接收点叠加剖面上选择一个最优相干时窗进行相干运算，求取静校正量；③根据纵波对应层位的地下构造对相干结果进行校正。通过模型和实际资料验证，改进后的算法可以解决地下反射层构造复杂时转换波静校正问题。

The static correction method of converted P-SV waves is always a problem in converted wave processing. There are many methods to solve this problem, of which the common-receiver-point stack traces coherent algorithm is an effective one when the underground structure is smooth. However, when the underground structure is too steep or the structure is complex, the true value of statics cannot be calculated by this method. Through theoretical derivation and experiment, the improved algorithm based on the common-receiver-point stack traces coherent algorithm was found to be suitable for the complex underground structure. The improved algorithm has three steps: 1) estimating the statics; 2) selecting the best coherent time window from the common-receiver-point stack profile for the coherent computation and calculating the statics; 3) correcting the value of “statics” by the underground structures corresponding to the formation of the P waves. Being verified by the model and actual data, the method is proved to be effective in resolving the problem of statics in the complex structure.