Transformation Coordination Converted Wave Static Correction Based on Wave Field Continuation
详细信息
- 责任者：Zhang Zhengfeng (College of Geo-Exploration Science and Technology ; Jilin University ; Changchun 130026 ; China) ; Guo Jian
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(5)
- 关键词：波场延拓 ; wavefield continuation
- 页码：p.1676-1685
- 图表：illus., 43 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
The basic idea of the conventional converted wave static correction is from the kinematic characteristics of seismic waves,which is based on the surface consistency assumption.In areas of complex surface conditions and big surface elevation differences,it is not only unable to solve the serious problem of static correction,but also to bring a new distortion.The method presented in this paper uses wave field continuation to complete the converted wave static correction,which is based on the frequency-wave number wave equation migration principle.The key point is the relationship between the time-space domain and frequency-wave number.For this problem,firstly,we transform the undulating surface into a horizontal surface under the new coordinate system,which moves the shot and receiver to the same level.Next we derive the wave equation and formula for wave field continuation under the new coordinate system,then continue the down going wave P and the up going converted wave SV up to the datum plane using the near-surface velocity,which can restore the real wave field between the undulating surface and datum plane.At last,we convert it to the original coordinate system to get the P-SV static correction seismic data on the datum plane and complete the converted wave static correction.The results of the processed model and real seismic data prove that this method is correct and effective.