A study on anisotropy of shale using seismic forward modeling in shale gas exploration
A study on anisotropy of shale using seismic forward modeling in shale gas exploration
复制标题
页岩气勘探中页岩各向异性地震正演研究
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Wei Wei
中科院分区：
文献类型：
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作者：
Sun Wei-Jia;Fu Li-Yun;Guan Xi-Zhu;Wei Wei
页岩表现出较强的各向异性，特别是高频分量（100 Hz），对数值方法的准确性提出了挑战。由于页岩气勘探仍然采用声波地震资料，本文首先介绍了VTI声波方程的一种人工偶阶微分解，阶解可以有效地提高计算精度和抑制数值频散，为了显示泥页岩的强各向异性效应，通过对VTI声波方程和声波方程在不同模型下的地震响应进行比较，数值结果表明，各向异性对地震波的动力学（相位）和动力学（振幅）有很大的影响，说明在处理地震资料时必须考虑各向异性的影响。
The accuracy of numerical methods is challenged by strong anisotropies shown by shale,especially for high-frequency components(100 Hz).Since the shale gas exploration still employs the acoustic seismic data,we first introduce an artificial even-order differential solution to VTI acoustic wave equation in the paper.The high-order solution can improve the computational accuracy and suppress numerical dispersion effectively.To show the effect of strong anisotropy of shale,we compare the seismic response of VTI acoustic wave equation with that of acoustic wave equation for different models.Numerical results show that anisotropy has large influences on the kinetics(phases) and the dynamics(amplitudes) of seismic waves.We conclude that the anisotropy must be considered when processing seismic data.