Residual curvature migration velocity analysis for angle domain common imaging gathers
Zhang Kai1, Li Zhen-Chun1, Zeng Tong-Sheng1, and Dong Xiao-Chun2
1. College of Earth Resources and Information in China University of Petroleum, Qingdao 266555, China.
2. Department of Quality and Energy Conservation of PetroChina Jilin Oilfield Company, Songyuan 138000, China.
Abstract Pre-stack depth migration velocity analysis is one of the keys to influencing the imaging quality of pre-stack migration. In this paper we cover a residual curvature velocity analysis method on angle-domain common image gathers (ADCIGs) which can depict the relationship between incident angle and migration depth at imaging points and update the migration velocity. Differing from offset-domain common image gathers (ODCIGs), ADCIGs are not disturbed by the multi-path problem which contributes to imaging artifacts, thus influencing the velocity analysis. On the basis of horizontal layers, we derive the residual depth equation and also propose a velocity analysis workflow for velocity scanning. The tests to synthetic and field data prove the velocity analysis methods adopted in this paper are robust and valid.
The study is supported by the National 863 Program (Grant No.2006AA06Z206, Sustained supported), the National Science and Technology Major Project (Grant No. 2008ZX05006-004), and SinoPec Group Marine Facies Research (Grant No. 08370502000410).
Cite this article:
ZHANG Kai,LI Zhen-Chun,ZENG Tong-Sheng et al. Residual curvature migration velocity analysis for angle domain common imaging gathers[J]. APPLIED GEOPHYSICS, 2010, 7(1): 49-56.
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2010, Vol. 7 
