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Application of Amplitude Ratio Profiles Extracted with Prestack Kirchhoff Integral Migration 被引量:1
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作者 Wu Zhiqin Wang Shangxu +2 位作者 Zhang Shaohong Wang Yun Wang Pengcheng 《Petroleum Science》 SCIE CAS CSCD 2007年第1期36-40,共5页
The Z component and X component profiles of seismic waves extracted with the prestack Kirchhoff integral migration could approximate to the primary wave (P wave) and converted shear wave (PS wave) profiles under c... The Z component and X component profiles of seismic waves extracted with the prestack Kirchhoff integral migration could approximate to the primary wave (P wave) and converted shear wave (PS wave) profiles under certain conditions. The relative change of their reflection amplitude reflects the formation stress anomaly and subsurface media anisotropy. The principle and method for extracting amplitude ratios were studied and the application of amplitude ratio profiles was also examined when processing and interpreting actual seismic data. The amplitude ratio profile is an effective supplementary means of identifying the stratigraphic boundary and lithology. 展开更多
关键词 prestack kirchhoff integral migration amplitude ratio profile converted shear wave primary wave LITHOLOGY
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Kirchhoff PSDM angle-gather generation based on the traveltime gradient 被引量:1
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作者 刘少勇 王华忠 +2 位作者 刘太臣 胡英 张才 《Applied Geophysics》 SCIE CSCD 2015年第1期64-72,121,122,共11页
Angle-domain common-image gathers(ADCIGs) are the basic data in migration velocity analysis(MVA) and amplitude variation with angle(AVA) analysis. We propose a common-angle gather-generating scheme using Kirchho... Angle-domain common-image gathers(ADCIGs) are the basic data in migration velocity analysis(MVA) and amplitude variation with angle(AVA) analysis. We propose a common-angle gather-generating scheme using Kirchhoff PSDM based on the traveltime gradient field. The scheme includes three major operations:(1) to calculate the traveltime field of the source and the receiver based on the dynamic programming approach;(2) to obtain the refl ection angle according to the traveltime gradient field in the image space; and(3) to generate the ADCIGs during the migration process. Because of the computation approach, the method for generating ADCIGs is superior to conventional ray-based methods. We use the proposed ADCIGs generation method in 3D large-scale seismic data. The key points of the method are the following.(1) We use common-shot datasets for migration,(2) we load traveltimes based on the shot aperture, and(3) we use the MPI and Open Mp memory sharing to decrease the amount of input and output(I/O). Numerical examples using synthetic data suggest that the ADCIGs improve the quality of the velocity and the effectiveness of the 3D angle-gather generation scheme. 展开更多
关键词 ADCIGs kirchhoff prestack depth migration angle domain common-image gathers migration velocity analysis
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Finite-difference calculation of traveltimes based on rectangular grid 被引量:2
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作者 LI Zhen-chun(李振春) +7 位作者 LIU Yu-lian(刘玉莲) ZHANG Jian-lei(张建磊) MA Zai-tian(马在田) WANG Hua-zhong(王华忠) 《Acta Seismologica Sinica(English Edition)》 CSCD 2004年第6期707-714,共8页
To the most of velocity fields, the traveltimes of the first break that seismic waves propagate along rays can be computed on a 2-D or 3-D numerical grid by finite-difference extrapolation. Under ensuring accuracy, t... To the most of velocity fields, the traveltimes of the first break that seismic waves propagate along rays can be computed on a 2-D or 3-D numerical grid by finite-difference extrapolation. Under ensuring accuracy, to improve calculating efficiency and adaptability, the calculation method of first-arrival traveltime of finite-difference is de- rived based on any rectangular grid and a local plane wavefront approximation. In addition, head waves and scat- tering waves are properly treated and shadow and caustic zones cannot be encountered, which appear in traditional ray-tracing. The testes of two simple models and the complex Marmousi model show that the method has higher accuracy and adaptability to complex structure with strong vertical and lateral velocity variation, and Kirchhoff prestack depth migration based on this method can basically achieve the position imaging effects of wave equation prestack depth migration in major structures and targets. Because of not taking account of the later arrivals energy, the effect of its amplitude preservation is worse than that by wave equation method, but its computing efficiency is higher than that by total Green′s function method and wave equation method. 展开更多
关键词 FINITE-DIFFERENCE eikonal equation first-arrival traveltime rectangular grid kirchhoff prestack depth migration Marmousi model
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