| Wavefield continuation datuming using a near surface model |
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| 作者姓名： | Cui Xingfu Li Hongbing Hu Ying Liang Hong Qi Li |
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| 作者单位： | Geophysical Technology Department, Research Institute of Petroleum Exploration ＆ Development, PetroChina. Beijing（100083） |
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| 基金项目： | This project is sporspored by Fund item： the National Development and Innovation Committee Program （2005） 2372, the National High-tech R＆D Program （863 Program） 2006AA06Z241 of China; Youth Innovation Fund of CNPC＇ Prestack Imaging Integral Study for Complex near Surface. |
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| 摘 要： | When topography and low velocity zone differences vary greatly, conventional vertical static time shifts will cause wavefield distortion and influence wave equation seismic imaging for seismic data acquired on a complex near surface. In this paper, we propose an approach to datum correction that combines a joint tomography inversion with wavefield continuation to solve the static problem for seismic data on rugged acquisition topography. First, the near surface model is obtained by refracted wave tomography inversion. Second, the wavefield of sources and receivers are continued downward and upward to accomplish datum correction starting from a flat surface and locating the datum above topography. Based on the reciprocal theorem, Huygens＇ and Fresnel principles, the location of sources and receivers, and regarding the recorded data on the surface as a secondary emission, the sources and receivers are upward-continued to the datum above topography respectively. Thus, the datum correction using joint tomography inversion and wavefield continuation with the condition of a complex near surface is accomplished.
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| 关 键 词： | 复合物 X线检测 数据测量 地质学 |
| 收稿时间： | 26 March 2007 |
| 修稿时间： | 2007-03-262007-04-18 |
Wavefield continuation datuming using a near surface model |
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| Cui Xingfu Li Hongbing Hu Ying Liang Hong Qi Li.Wavefield continuation datuming using a near surface model[J].Applied Geophysics,2007,4(2):94-100. |
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| Authors: | Xingfu Cui Hongbing Li Ying Hu Hong Liang Li Qi |
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| Abstract: | When topography and low velocity zone differences vary greatly, conventional vertical static time shifts will cause wavefield
distortion and influence wave equation seismic imaging for seismic data acquired on a complex near surface. In this paper,
we propose an approach to datum correction that combines a joint tomography inversion with wavefield continuation to solve
the static problem for seismic data on rugged acquisition topography. First, the near surface model is obtained by refracted
wave tomography inversion. Second, the wavefield of sources and receivers are continued downward and upward to accomplish
datum correction starting from a flat surface and locating the datum above topography. Based on the reciprocal theorem, Huygens’
and Fresnel principles, the location of sources and receivers, and regarding the recorded data on the surface as a secondary
emission, the sources and receivers are upward-continued to the datum above topography respectively. Thus, the datum correction
using joint tomography inversion and wavefield continuation with the condition of a complex near surface is accomplished.
This project is sporspored by Fund item: the National Development and Innovation Committee Program (2005) 2372, the National
High-tech R&D Program (863 Program) 2006AA06Z241 of China; Youth Innovation Fund of CNPC’ Prestack Imaging Integral Study
for Complex near Surface.
Cui Xingfu, senior engineer, received a B.S. from the Applied Mathematic Department in Ha’erbing Industrial University in 1988, an M.S.
in 1991, and PhD from the Institute of Computational Mathematics and System Science, Chinese Academy of Science in 2004. His
main research interests are seismic data processing and methodology. He has published many scientific papers and won awards. |
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| Keywords: | Complex near surface tomography inversion wavefield continuation datum correction |
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