初至波表层模型层析反演

Tomographic inversion of first break in surface model

针对地震勘探中的复杂地表问题 ,本文提出了一套地震初至波表层模型层析反演方法。该方法是利用地震波射线的走时和路径 ,反演介质速度结构的一种高精度的反演方法。它利用地震直达波、辶回折波、折射波以及三者组合的初至波和层析反演方法具有的纵、横向变速优势 ,实现适应速 度任意变化的复杂表层模型反演。理论模型与实际资料的反演结果表明 ,其效果显著。

The paper proposed a set of methods for tomographic inversion of seismic first break in surface model aimed at complex surface problem in seismic prospecting. The technique is high resolution inversion using travel time and path of seismic ray for inverting the velocity structure of medium. Tomographic inversion of first break using direct wave, diving wave, refraction wave and combination of the three has the advantage of having vertical and lateral variable velocity and is suitable for inversion in complex surface model that the velocity can vary arbitrarily. Theoretical model and real data show that effects of the inversion is remarkable.