| 摘要: |
| 为提高炮域叠前深度偏移的计算效率，引人时移成像条件进行叠前深度偏移。基于频率空间域有限差分波场 延拓算子进行延拓，采用时移成像条件来求取大延拓步长间的层位成像值,成像条件虽然增加一次逆傅里叶变换， 但对计算时间的影响却不大。脉冲响应和Marmcmsi模型的测试结果表明,所提出的方法在得到与小步长效果相当 的成像结果的同时,又可以成倍地提高计算效率。 |
| 关键词: 叠前深度偏移 时移成像条件 计算效率 波动方程 |
| DOI： |
| 分类号: |
| 基金项目:B家“863“计划项目(2006AA06Z206>;H家“973”计划项目<2007CB209605);中H石油大学(华东)研究生创新基金项H (B2009-12) |
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| Prestack depth migration based on wave equation using time-shift imaging condition |
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XU Xiu-gang, LI Zhen-chun, YE Yue-ming, TONG Zhao-qi, QIN De-wen
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(College of Geo-Resources and Information in China University of Petroleum，Dongying 257061，China)
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| Abstract: |
| In order to improve the efficiency of prestack depth migration of shot field，time-shift imaging condition was used for prestack depth migration. Based on frequency space finite difference operator for continuation, the time-shift imaging condition was used to get the imaging results of the layers among the larger continuation step. Though another inverse Fourier transform is needed, it has little effect on ihe computational efficiency. The impulse and Marmousi model test results show that the proposed method doubles the computational efficiency with the imaging results equivalent to the results of small step. |
| Key words: prestack depth migration time-shift imaging condition computational efficiency wave equation |
