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在转换波地震勘探数据处理中,接收点的横波静校正一直是较难解决的问题.因为横波速度基本不受潜水面的影响,横波低速带厚且不均匀,速度又比较低,通常会造成转换波接收点的横波静校正量大且横向变化剧烈,与纵波静校正没有直接相关性.针对这种情况,我们采用改进的纵波构造时间控制方法求取转换波接收点的静校正,在转换波的共接收点叠加剖面上追踪拾取多组同相轴,联合纵波对应层位的地下构造时间确定接收点大的横波静校正量.通过不同的时移将几个相邻的层位合成一个反射层位,解决同相轴不能连续追踪的难题,同时利用浅、中和深层多组层位对一个接收点的静校正量求其平均,降低拾取误差对静校正量的影响,兼顾地下浅、中和深层的静校正效果.实际数据处理结果表明,该静校正方法能稳定的解决转换波静校正问题,取得了较好的应用效果.
In the seismic data processing of converted waves, the static correction of transverse wave at receiving point has always been a difficult problem to be solved, because the shear wave velocity is basically unaffected by the diving surface, and the low and high shear velocity bands are usually low In this case, we adopt the improved time-control method of compressional wave to obtain the static correction of the receiving point of the converted wave, and in the conversion A total of multiple sets of events are tracked and picked up on the overlapped receiving point of the wave, and the time of the subsurface structure corresponding to the corresponding longitudinal layer of the compressional wave is used to determine the large amount of static correction of the transverse wave at the receiving point. Several adjacent horizon layers are combined into one reflection Horizon to solve the problem that the events can not be continuously tracked. At the same time, the statics of one receiving point are averaged by shallow, middle and deep multi-layered horizon, and the influence of picking error on static correction is reduced. And the deep static correction effect.The actual data processing results show that the static correction method can solve the static correction problem of the converted wave steadily and achieve a good application effect.