Angle-Domain Migration Velocity Analysis Based on Elastic-Wave Kirchhoff Prestack Depth Migration

详细信息   

• 责任者：Du Qizhen (School of Earth Resource and Information ; China University of Petroleum ; Dongying 257061 ; China) ; Li Fang
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(5)
• 关键词：叠前深度偏移 ; prestack depth migration ; 速度分析 ; velocity analysis
• 页码：p.1327-1339
• 图表：13 illus., 19 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

Based on multicomponent seismic data angle-domain common-image gathers (ADCIGs), elastic wave migration velocity analysis is proposed in this paper. Firstly, according to the elastic Kirchhoff migration equation which is based on space shift image condition, P- and PS converted waves subsurface offset-domain common-image gathers (SODCIGs) are extracted and transformed into P-incidence angle-domain common-image gathers (P-ADCIGs) for P- and PS converted waves through the radial-trace transformation in the Fourier domain, respectively. Secondly, P- and PS converted wave residual movement equations were derived, and velocity analysis criteria of image depth consistency for P- and PS converted waves at the same reflector were proposed. The authors iteratively update the velocities based on residual movement equations for P- and PS converted wave angle-domain common-image gathers.