Tomographic velocity inversion for ADCIGs in areas with a rugged surface
Zhang Kai1, Li Zhen-Chun1, Zeng Tong-Sheng1, Qin Ning1, and Yao Yun-Xia2
1. College of Geoscience in the China University of Petroleum, Qingdao 266555, China.
2. Shanghai Company of China National Offshore Oil Corporation, Shanghai 200030, China.
Abstract Pre-stack depth migration velocity analysis is one of the key techniques infl uencing image quality. As for areas with a rugged surface and complex subsurface, conventional prestack depth migration velocity analysis corrects the rugged surface to a known datum or designed surface velocity model on which to perform migration and update the velocity. We propose a rugged surface tomographic velocity inversion method based on angle-domain common image gathers by which the velocity fi eld can be updated directly from the rugged surface without static correction for pre-stack data and improve inversion precision and efficiency. First, we introduce a method to acquire angle-domain common image gathers (ADCIGs) in rugged surface areas and then perform rugged surface tomographic velocity inversion. Tests with model and fi eld data prove the method to be correct and effective.
This research is sponsored by the National 863 Project (No. 2009AA06Z206), the Self-governed Innovative Project of China University of Petroleum (No. 11CX04010A), and the Doctoral Fund of National Ministry of Education (No. 20110133120001).
Cite this article:
ZHANG Kai,LI Zhen-Chun,ZENG Tong-Sheng et al. Tomographic velocity inversion for ADCIGs in areas with a rugged surface[J]. APPLIED GEOPHYSICS, 2012, 9(3): 313-318.
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