基于声波―黏弹性波流固耦合方程的多参数全波形反演

打开文本图片集

中图分类号：P631 文献标识码：A DOI：10. 13810/j. cnki. issn. 1000⁃7210. 20240430

Abstract： The seismic wave propagation environment of marine seismic exploration is a coupling medium consisting of fluid（upper seawater） and solid（the rock formation below the seabed）. The fluid ⁃ solid coupling equation can simulate the propagation law of seismic waves in marine seismic exploration with high accuracy. However， most of current fluid⁃solid coupling equations are based on acoustic and elastic wave equations， with the frequency dissipa⁃ tion effect caused by quality factors in solids ignored. In this paper， based on the acoustic wave equation and the vis⁃ coelastic wave equation， the acoustic and viscoelastic wave coupling equation is constructed through introducing the relationship between pressure component and normal stress into the viscoelastic wave equation. Moreover， the multi ⁃parameter full waveform inversion of the coupling equation is realized. The model experiment results show that the accuracy of the multi⁃parameter full waveform inversion based on the acoustic and viscoelastic wave coupling equa⁃ tion is obviously better than that of the acoustic and elastic wave coupling equation for velocity and other parameters because it fully considers the frequency dissipation effect in seismic wave propagation. The proposed method has a good application prospect in the full waveform inversion of actual OBN data.

Keywords：full waveform inversion，viscoelastic wave，fluid⁃solid coupling equation，multi⁃parameter刘光照，毛士博，宋鹏，等 . 基于声波─黏弹性波流固耦合方程的多参数全波形反演［J］. 石油地球物理勘探，2025，60（3）：700‑709.LIU Guangzhao，MAO Shibo，SONG Peng，et al. Multi⁃parameter full waveform inversion based on fluid⁃solidcoupling equations of acoustic⁃viscoelastic waves［J］. Oil Geophysical Prospecting，2025，60（3）：700‑709.

0 引言

全波形反演（Full Waveform Inversion，FWI）于20 世纪 80 年代提出[1⁃2]，是一种通过最优化减少观测数据与模拟数据之间的整体波形差异重建地下参数的方法。（剩余11901字）