无射线追踪层析静校技术在川西复杂地区资料处理中的应用

The application of tomography static correction method without ray tracing in the seismic data processing of the complicated West Sichuan area,China

静校正问题已成为解决复杂地区地震成像的关键问题,弄清复杂地区近地表速度模型,解决复杂地区的静校正问题已经成为物探工作者的当务之急。在众多静校正方法中,Osypov提出的无射线追踪的折射层析静校方法首先利用初至旅行时进行视速度和延迟时的估计,然后利用Herglotz-Wiechert公式进行速度模型估计,进而实现静校正量的计算,在反演过程中不进行射线追踪,它既具有首波方法的稳定性,又具有回折波方法的实用性。在分析了影响该方法处理效果的主要参数后,将它应用于川西复杂地区地震资料处理中,应用后炮记录的质量得到了较大的改进,叠加剖面中层位错断现象得到消除,资料品质得到较大提高。该方法能较好地解决复杂地区的静校正问题。

The problem of statics has been an important problem in seismic data processing of a complicated area. In the various static correction methods, the Refraction Tomo-Statics without ray tracing proposed by Osypov estimateds the apparent velocities and delay times using first arrival travel time data, then estimates the penetration depth of the refracted wave using Herglotz Wiechert formula, and calculates statics. There is no ray tracing in the inversion, and it is not only robust as head-wave methods, but also practical as turning-ray tomography. After analyzing the primary parameter, it was applied to the seismic data processing of West Sichuan complicated area, the quality of shot gather was improved, the phenomenon of phase distortion in stacking section was overcomed, and the quality of stacking section was improved greatly. The method can deal with the static correction problem in a complicated area.