| 摘要: |
| 为解决起伏地表条件下的偏移成像,引人了共聚焦点成像技术。采用合成聚焦算子和面炮合成的共聚焦点方 法和波场逐步累加的直接下延法对起伏地表条件下的模型资料和实际资料进行偏移成像研究。结果表明:该方法 克服了起伏地表的影响,直接实现了基于起伏地表的叠前深度成像;采用波场延拓的方法实现了起伏地表条件下的 单点聚焦成像和多点聚焦成像;在一定程度上解决了起伏地表的静校正问题，并且计算效率得到提高，在选取较少 聚焦点的情况下,就可以达到和共炮偏移一样的成像效果。 |
| 关键词: 起伏地表 共聚焦点成像 合成聚焦算子 共聚焦点道集 叠前深度偏移 |
| DOI：10.3969/j.issn.1673-5005.2010.02.007 |
| 分类号:P 631.443 |
| 基金项目:国家“863”专题(2006AA06Z206);国家“973”计划项目(2007CB209605);中国石油大学(华东)研究生创新基金项目(B2009-12) |
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| Wave equation common focus-point migration based on irregular surface |
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XU Xiu-gang1,LI Zhen-chun1,YE Yue-ming1,BAO Jing-wei2
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(1. College of Geo-Resources and Information in China University of Petroleum,Dongying 257061, China;2. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083，Chirm )
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| Abstract: |
| In order to solve the migration of the irregular surface, common focus-point imaging technique was used. The migrations of the model and actual data based on irregular surface were studied using two methods. One is the common focus-point method based on the synthesis focusing operator and the theory of synthesis areal source, the other is the wave field downward continuation based on accumulating step by step. The results show that this method overcomes the influence of the irregular surface and directly achieves the pre-stack depth migration. The migrations of the single focus-point and many focus-points were realized by the wave field continuation method. The static correction problem of the irregular surface was solved at a certain extent，and the calculation efficiency was improved. The migration result can be gotten which is similar to the common shot-records gather migration result choosing a few of the focusing points. |
| Key words: irregular surface common focus-point imaging technique synthesis focusing operator common-focus-point gather pre-stack depth migration |
