Elastic wave forward modeling and wave-field separation of irregular free-surface based on the layered mapping method

被引：0
|
作者：
Qu Y. [1 ]
Huang J. [1 ]
Li Z. [1 ]
Li Q. [1 ]
Li R. [2 ]
Wang Y. [3 ]
机构：
[1] School of Geosciences, China University of Petroleum (East China), Qingdao, 266580, Shandong
[2] Gas Development Department, Qinghai Oilfield Company, PetroChina, Golmud, 816000, Qinghai
[3] Korla Branch, GRI, CNPC, Korla, 841001, Xinjiang
来源：
Huang, Jianping (jphuang@upc.edu.cn) | 1600年 / Science Press卷 / 51期
关键词：
Curved coordinate system; Forward modeling; Free boundary condition; Irregular surface; Layered mapping method; Wave-field separation;
D O I：
10.13810/j.cnki.issn.1000-7210.2016.02.008
中图分类号：
学科分类号：
摘要：
Conventional finite difference method has some difficulties to deal with irregular free-surface. Conventional mapping method can overcome the disadvantage by transforming irregular surface to horizontal surface. But at the same time, the interface below the surface will be destroyed, resulting in inaccurate wave propagation and false reflection. Thus we improve the conventional mapping method and propose an elastic wave forward modeling and wave-field separation of irregular free-surface based on layered mapping method. After realizing the algorithm, several typical irregular free surface models are tested with the seismic forward modeling. The results suggest that: A. The layered mapping method can transform both the irregular surface and interface to horizontal surface and interface. Compared with conventional rectangular grids and conventional mapping method, the layered mapping method has a better adaptability for dual-complex structure; B. Forward modeling comparison tests prove that the layered mapping method has higher simulation accuracy and a better ability of suppressing dispersion; C. The wave-field separation of irregular free-surface based on layered mapping method can accurately separate P-and S-wave, which can provide a key approach for the irregular free-surface elastic imaging. © 2016, Science Press. All right reserved.
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页码：261 / 271
页数：10
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