Reflection seismic waveform tomography of physical modelling data
Reflection seismic waveform tomography of physical modelling data
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DOI：
10.1088/1742-2132/13/2/146
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发表时间：
2016-03
影响因子：
1.4
通讯作者：
Y. Rao;Yanghua Wang;Zd Zhang;Y. Ning;X-H. Chen;J. Li
中科院分区：
文献类型：
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作者：
Y. Rao;Yanghua Wang;Zd Zhang;Y. Ning;X-H. Chen;J. Li
在将该方法应用于现场地震数据之前，通常使用数值生成的合成地震数据来测试波形层析成像。然而，理想化的合成数据与真实的野外数据之间往往存在着明显的差异，野外数据中的许多因素，如噪声、不规则的源/接收器几何结构等，都会影响反演结果。为了探索反射地震波形层析成像的潜力，我们提出了一种比合成数据试验更符合实际的试验方法，将其应用于物理模拟数据，重建具有复杂速度变化的实验室模型。首先，我们提供了一个配方的完全匹配层吸收边界条件，与二阶声波方程，以抑制人工反射从地下模型边界的地震波形模拟和层析成像。然后，我们展示了一个成功的实施层剥离反演方案适用于反射地震波形层析成像。最后，我们证实了频率分组的有效性，而不是在每次迭代中的单个频率，一种专门用于频域波形层析成像的策略。
Waveform tomography is commonly tested using numerically generated synthetic seismic data, before the method is applied to field seismic data. However, there are often noticeable differences between idealized synthetic data and real field data, and many factors in the field data, such as noise, irregular source/receiver geometry, affect the inversion solutions. For exploring the potential of reflection seismic waveform tomography, we presented a more realistic test than the synthetic data test, by applying it to physical modelling data, to reconstruct a laboratorial model with complex velocity variation. First, we provided a formulation of the perfectly matched layer absorbing boundary condition, associated with the second-order acoustic wave equation, in order to suppress artificial reflections from subsurface model boundaries in seismic waveform simulation and tomography. Then, we demonstrated the successful implementation of a layer-striping inversion scheme applicable to reflection seismic waveform tomography. Finally, we confirmed the effectiveness of frequency grouping, rather than a single frequency at each iteration, a strategy specifically for the frequency-domain waveform tomography.