【摘要】 采用标准线性固体模型,本文建立了黏弹性介质完全匹配层吸收边界的高阶速度一应力交错网格有限差分算法,并对黏弹性介质中的地震波传播进行了数值模拟.基于黏弹性波动方程正演模拟提供的零偏VSP全波场数据,本文进行了质心频移法计算Q值的反演分析.结果表明,反射波、转换波及短程多次波对频谱的影响较大,对Q值反演造成一定误差.本文的结论为实际零偏VSP资料估算地层Q值提供了有益的指导.更多还原

【Abstract】 Using the standard linear solid model,a high-order velocity-stress staggered-grid finite-difference scheme with the perfectly matched layer method was proposed for simulating seismic wave propagation in viscoelastic media.With the full-wave field data of viscoelastic modeling of zero-offset VSP from several numerical experiments,the frequency shift method to calculate Q-value was analyzed.The numerical results showed that reflected waves,transformed waves and short-path multiples have relatively large influences on the frequency spectra of received data,and make further impacts on the Q-value inversion.The conclusions taken from the paper can provide helpful guidance for the estimation of subsurface interval Q-value with oilfield zero-offset VSP data.更多还原