基于双差的波动方程反射波旅行时反演方法

发布时间：2018-09-07 11:02

【摘要】：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。
[Abstract]:When the amplitude and waveform of the simulated data and the observed data differ greatly, the accuracy of the travel time difference picked up by the dynamic moveout correction (Dynamic Image Warping,DIW) method is low, which easily leads to the failure of the target functional convergence. In order to improve the stability of time difference estimation, this paper proposes a double difference based wave reflection travel time inversion (Double difference Wave Equation Reflection Traveltime Inversion,DWERTI) method by modifying the target functional. The traditional DIW method is regularized to improve the stability of time difference estimation. The inversion test of Sigsbee 2A model is carried out on the basis of programming algorithm. The results show that the traveling time inversion method based on double difference wave equation can effectively improve the stability of travel time information inversion and provide a more reliable initial velocity field for the subsequent conventional full waveform inversion.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家“973”课题(2014CB239006) 国家自然科学基金(41274124) 国家油气重大专项课题(2016ZX05014001,2016ZX05002)联合资助
【分类号】：P631.4

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