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Depth Migration Based on Two-Way Wave Equation to Image OBS Multiples: A Case Study in the South Shetland Margin (Antarctica)
Geofluids ( IF 1.7 ) Pub Date : 2020-11-09 , DOI: 10.1155/2020/8843048
Sha Song 1, 2 , Jiachun You 3 , Qing Cao 2 , Bin Chen 2 , Xiaomeng Cao 4
Affiliation  

With the development of marine seismic exploration, the ocean bottom seismometer (OBS) as a new seismic acquisition technology has been widely concerned. Although multiple waves are frequently viewed as noises, they may carry a wealth of subsurface information and produce a broader illumination than primary waves. To perform multiple wave imaging, we propose to utilize a two-way wave equation depth wavefield extrapolation method which is rarely used in this field. A simple dipping model is imaged by using primary and multiple waves, which proves the superiority of multiple waves in imaging over the primary waves and lays a foundation for practical application. Moreover, the comparison of multiple imaging results by reverse time migration and those by our proposed method demonstrates that our proposed method requires less storage space. In this study, we apply this migration method to actual OBS data collected in the South Shetland margin (Antarctica), where gas hydrates have been well documented. Firstly, the wavefield separation method is adopted to process the OBS data, so as to produce reliable primary and multiples waves; secondly, the ray-tracing method is used to derive the velocity field; and finally, the depth wavefield extrapolation method based on the two-way wave equation is applied to image primary and multiple waves. Migration results show that multiple waves provide a broader illumination and a clearer sediment structure than primary waves, especially for the highly shallow reflections.

中文翻译:

基于双向波方程的深度偏移成像 OBS 倍数:南设得兰群岛边缘(南极洲)的案例研究

随着海洋地震勘探的发展,海底地震仪(OBS)作为一种新型的地震采集技术受到了广泛的关注。尽管多次波经常被视为噪声,但它们可能携带大量地下信息并产生比一次波更广泛的照明。为了进行多波成像,我们建议利用在该领域很少使用的双向波动方程深度波场外推法。利用一次波和多次波成像了一个简单的倾角模型,证明了多次波在一次波成像方面的优越性,为实际应用奠定了基础。此外,通过逆时偏移的多次成像结果与我们提出的方法的比较表明我们提出的方法需要更少的存储空间。在这项研究中,我们将这种迁移方法应用于在南设得兰群岛边缘(南极洲)收集的实际 OBS 数据,那里的天然气水合物已被很好地记录在案。首先,采用波场分离法对OBS数据进行处理,产生可靠的一次波和多次波;其次,采用射线追踪法推导速度场;最后,将基于双向波动方程的深度波场外推方法应用于成像一次波和多次波。迁移结果表明,与一次波相比,多次波提供了更广泛的照明和更清晰的沉积结构,特别是对于高度浅的反射。采用波场分离法处理OBS数据,产生可靠的一次波和多次波;其次,采用射线追踪法推导速度场;最后,将基于双向波动方程的深度波场外推方法应用于成像一次波和多次波。迁移结果表明,与一次波相比,多次波提供了更广泛的照明和更清晰的沉积结构,特别是对于高度浅的反射。采用波场分离法处理OBS数据,产生可靠的一次波和多次波;其次,采用射线追踪法推导速度场;最后,将基于双向波动方程的深度波场外推方法应用于成像一次波和多次波。迁移结果表明,与一次波相比,多次波提供了更广泛的照明和更清晰的沉积结构,特别是对于高度浅的反射。
更新日期:2020-11-09
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