Wave-equation based migration of primaries and free-surface multiples simultaneously with artifact suppressing
Wave-equation based migration of primaries and free-surface multiples simultaneously with artifact suppressing
复制标题
基于波动方程的一次波和自由表面多次波偏移同时进行伪影抑制
DOI：
10.1088/1742-2140/aac997
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发表时间：
2018-07
影响因子：
1.4
通讯作者：
Li Lisheng
中科院分区：
文献类型：
--
作者：
Ye Yueming;Ren Haoran;Guo Qingxin;Li Lisheng
自由面相关多次波广泛存在于海洋地震资料中。利用多次波而不是压制成像具有特别的益处，因为多次波比一次波具有更多的信息，例如更宽的照明和更高的垂直分辨率。基于单程波动方程的叠前深度偏移（OWPSDM）是一种有效的成像工具，具有计算效率高的特点。通过使用OWPSDM算子，一次波和多次波同时成像。由前向传播的震源和后向传播的多次波之间的互相关引起的伪影可以通过以下三个步骤的方法来抑制：对于第一步骤，用记录的野外数据和子波一起代替震源，数据是记录的野外数据。成像结果包含真实的结构图像和伪影。对于第二步，源是子波，并且数据被预测的自由表面相关多次波代替。在使用每个深度处的成像条件之后可以获得伪影。最后，伪影可以通过从第一步骤中获得的图像中进行自适应减法来抑制。对三层模型的合成数据的数值试验表明，我们的方案提供了更广泛的照明和平衡的图像振幅相比，与原色只获得的图像的区域。由前向传播的子波和后向传播的自由表面多次波之间的互相关引起的伪影被正确地预测和抑制。将该方法应用于真实的深海数据，结果表明，该方法提高了深层目标层的成像质量，且光照均衡，伪影较少。
Free-surface related multiples exist widely in marine seismic data. Imaging with multiples rather than suppression has particular benefits because multiples have more information than primaries, such as wider illumination and higher vertical resolution. One-way wave-equation based pre-stack depth migration (OWPSDM) is an effective imaging tool with high calculation efficiency. By using an OWPSDM operator, primaries and multiples are imaged simultaneously. The artifacts caused by the cross-correlation between forward-propagated source and backward-propagated multiples can be suppressed by an approach with the following three steps: for the first step, the source is replaced by the recorded field data together with a wavelet and the data is the recorded field data. The imaging results contain both real structure images and artifacts. For the second step, the source is the wavelet and the data is replaced by the predicted free-surface related multiples. Artifacts can be obtained after using the imaging condition at each depth. Lastly, artifacts can be suppressed by adaptive subtraction from the images obtained in the first step. Numerical tests on synthetic data of a three-layer model show that our scheme provides regions with wider illumination and balanced image amplitudes compared to the images obtained with primaries only. Artifacts caused by the cross-correlation between a forward-propagated wavelet and backward-propagated free-surface multiples were properly predicted and suppressed. Applying the proposed method to real deep marine data shows that the image quality of deep target layers is improved, with balanced illumination and fewer artifacts.
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影响因子：
3.3
作者：
D. Ristow;T. Rühl
通讯作者：
D. Ristow;T. Rühl
影响因子：
3.3
作者：
Dongliang Zhang;G. Schuster
通讯作者：
Dongliang Zhang;G. Schuster
影响因子：
3.3
作者：
D. Verschuur;A. J. Berkhout;C. Wapenaar
通讯作者：
D. Verschuur;A. J. Berkhout;C. Wapenaar
影响因子：
3.3
作者：
Liu, Yike;Chang, Xu;Zheng, Yingcai
通讯作者：
Zheng, Yingcai
DOI：
10.1190/1.1817440
发表时间：
2003
期刊：
Seg Technical Program Expanded Abstracts
影响因子：
--
作者：
G. Shan
通讯作者：
G. Shan