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变参考慢度Rytov近似傅氏偏移方法
引用本文:杜正聪,贺振华,蒲利春,王志. 变参考慢度Rytov近似傅氏偏移方法[J]. 中国石油大学学报(自然科学版), 2004, 28(4)
作者姓名:杜正聪  贺振华  蒲利春  王志
作者单位:1. 攀枝花学院理学系,四川攀枝花,617000;电子科技大学电子工程系,四川成都,610054
2. 成都理工大学信息工程学院,四川成都,610059
3. 攀枝花学院理学系,四川攀枝花,617000
基金项目:国家"973"重点基础发展规划项目(G1999043311)
摘    要:针对常规Rytov近似傅氏偏移方法对于剧烈横向变速介质不能精确成像的状况,提出了变参考慢度Rytov近似傅氏偏移方法,从理论上解决了任意速度变化地质模型的偏移成像问题。为了进一步提高复杂地层的成像精度和波场延拓算子的稳定性,对散射波场的计算公式作了改进。将该方法运用于盐丘模型的正演和偏移试验,与常规Rytov近似偏移方法相比较可明显看出,变参考慢度Rytov近似傅氏偏移方法的处理效果得到了改善,其处理横向速度变化的能力大大增强。

关 键 词:复杂地层  偏移成像  变参考慢度  Rytov近似傅式偏移方法  散射波场  横向速度  波场延拓算子

Rytov approximation Fourier migration method with variable reference slowness
DU Zheng-cong. Rytov approximation Fourier migration method with variable reference slowness[J]. Journal of China University of Petroleum (Edition of Natural Sciences), 2004, 28(4)
Authors:DU Zheng-cong
Affiliation:DU Zheng-cong~
Abstract:Because the conventional Rytov approximation Fourier migration method cannot accurately image the media with acute lateral variation of velocity, a Rytov approximation Fourier migration method with variable reference slowness was proposed to theoretically solve the migration image of the arbitrary velocity change model. In order to raise the imaging accuracy of complex layer and the stability of wavefield continuation operator, the scattered wavefield formula was improved. This method was applied to the foreword modeling and migration test of salt body model. The results show that Rytov approximation Fourier migration method with variable reference slowness is more efficient than the conventional Rytov approximation migration method. The ability for processing the variation of the lateral velocity increases greatly.
Keywords:complex formation  migration image  variable reference slowness  Rytov approximation Fourier migration method  scattered wavefield  lateral velocity  continuation operator
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