薄互层油藏模型黏弹性波方程正演模拟研究

摘要

本文采用质心频率法和小波瞬时衰减系数法反演计算了薄互层油气储层的Q值,建立了薄互层油气储集体黏弹性介质模型.采用非均匀介质中黏弹性波方程交错网格高阶有限差分法进行了黏弹性波和弹性波正演模拟.数值模拟试验表明,黏弹性波模拟的油气水AVO响应与弹性波模拟的油气水AVO响应存在明显差异.黏弹性波方程数值模拟能够更加真实模拟实际地震波场.纵波和转换波偏移剖面与正演模型吻合很好.%The paper used centroid frequency method and wavelet instantaneous attenuation coefficient method for Q-value inversion in thin-interbedded reservoir and created viscoelastic medium model of thin-interbedded reservoir. The staggered grid high-order finite-difference algorithm of viscoelastic wave equation in non-homogeneous medium was used to carry out forward simulation of viscoelastic and e-lastic waves. The numeric simulation showed that there is significant difference in AVO response of oil, gas and water between using viscoelastic wave simulation and using elastic wave simulation. The numeric simulation of viscoelastic wave equation is able to more realistically simulate the practical seismic wavefield and migrated sections of P- and PS-converted waves are coincident to forward models.