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当模拟数据与观测数据振幅、波形相差较大时,动态时差矫正(Dynamic Image Warping,DIW)方法拾取的旅行时时差精度较低,易导致目标泛函收敛失败。为此,本文通过修改目标泛函,提出了一种基于双差的波动方程反射波旅行时反演(Double difference Wave Equation Reflection Traveltime Inversion,DWERTI)方法,并对传统的DIW方法进行正则化约束以提高时差估计的稳定性。在编程实现算法的基础上对Sigsbee 2A模型进行反演测试。计算结果表明:基于双差的波动方程反射波旅行时反演方法能够有效提高旅行时信息反演的稳定性,为后续常规全波形反演提供更为可靠的初始速度场。
When the amplitudes and the waveforms of the simulated data and the observed data differ greatly, the accuracy of travel time difference picked up by the Dynamic Image Warping (DIW) method is low, which easily leads to the convergence of the target functional. Therefore, this paper proposes a Double Difference Wave Equation Reflection Traveltime Inversion (DWERTI) method based on double difference by modifying the target functional, and regularizes the traditional DIW method Improve the stability of the time difference estimation. The inversion of Sigsbee 2A model is carried out on the basis of programming algorithm. The calculation results show that the inversion method based on double difference wave equation of reflected wave travel time can effectively improve the stability of information retrieval when traveling, and provide a more reliable initial velocity field for subsequent conventional full waveform inversion.