Application of zero-offset VSP data transformation to bridge calibration in high-dip structure areas
Cai Zhidong1,2, Wang Chong2, Chen Ce2, Wang Yang2, Jiang Zhongcheng3, Tian Wenhui2
1. School of Geophysics and Information Technology, China University of Geosciences(Beijing), Beijing 100083, China; 2. New Technique Prospecting Department, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China; 3. GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China
Abstract:The bridge calibration of vertical seismic profile (VSP) is one of the key approaches to bridging surface seismic,logging,and lithology data.However for high-dip structure areas,this bridge calibration cannot achieve horizon analysis because the up-going wave field is not flatted.Therefore we propose in this paper a new approach of bridge calibration for zero-offset VSP data.For the zero-offset VSP data transformation,up-going waves after NMO are classified and listed as sub-matrix.Then horizons are calibrated on this data.This approach calibrates horizons directly on the transformed data rather than on VSP corridor stacked data.So calibrated results are more intuitional,more reliable,and better for seismic and geology analysis.An application example in Tarim Basin demonstrates the effectiveness of the proposed approach.
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