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采用时间项技术的三维初至折射波静校正方法在求解大型方程组时由于方程组的病态性质将遇到困难。本文利用折叠技术 ,将地震采集初至数据进行折叠处理 ,能基本消除高速层顶面旅行时的影响 ,再通过 SIRT方法求解 ,不仅可以消除方程组的病态问题 ,而且可以在保证精度的情况下大幅度地减少方程的数目 ,显著提高求解的速度。经过理论资料和实际资料分别进行不同静校正量的处理效果对比 ,验证了此法的正确性和有效性。
The three-dimensional initial refracted wave static correction method using time-term technique will encounter difficulties due to the ill-conditioned nature of the system when solving large-scale system. In this paper, we use the folding technology to fold the data from the beginning to the end of the seismic acquisition, and can basically eliminate the influence of traveling on the top surface of the high-velocity layer. The SIRT method can not only solve the pathological problems of the equations but also ensure the precision Dramatically reduce the number of equations, significantly speeding up the solution. Through theoretical data and actual data, respectively, the different statics correction effect comparison, verify the correctness and effectiveness of this method.