Methods of Removing Pseudo SV-Wave Artifacts in TTI Media qP-Wave Reverse-Time Migration
详细信息
- 责任者：Zhang Yan (Deparment of Gesciences ; China University of Petroleum ; Qingdao 266555 ; China) ; Wu Guochen
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(6)
- 关键词：时间偏移 ; time migration ; 去噪 ; denoising
- 页码：p.2065-2076
- 图表：6 illus., 52 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
In the process of imaging subsurface complex structure media, in particular with salt flank and the area bellow it, compared to the method of traditional isotropic reverse-time migration and VTI reverse-time migration, TTI reverse-time migration can produce the best image, not only the continiuity of reflection is much better, but also the energy can be focused more intensely. The traditional anisotropic full elastic wave reverse-time migration clearly is more computer resources demanding and inefficient. Because the information of qP-wave is still playing the leading role in seismic exploration at present, the methods of choosing qP-wave equations in TTI reverse-time migration become pretty important. For improving the calculating efficient, the anisotropic elasto-dynamic equations of motions are often simplified to acoustic equations which only allow qP-wave propagate by seting the velocity of SV-wave equal to zero along the symmetry axis orientation. However, it can bring a low-speed and low-amplitude qSV-artifacts which will destroy the results of reverse-time migration greatly. Firstly,We build the PML controlling equations of qP wave equations. After that, combined with the auxiliary wavefield, in this paper we introduce a cost-effective method which suppresses pseudo SV-wave artifacts perfectly. Numerical examples are included to show the validity of the algorithm.
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