Modeling and imaging of undulating surface based on GeoEast system
XU Leiliang1, FAN Zhengcai1, ZHAO Guoyong1, LIU Jianhong2, ZHANG Haixin1, WANG Shurong1
1. TechnicalR&D Center, Sinopec Geophysical Corporation R&D Center, Nanjing, Jiangsu 211100, China; 2. Research & Development Center, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China
Abstract：In conventional seismic data processing in the time domain, pre-stack data are corrected onto the floating datum after static correction. In the common-midpoint (CMP) gather, shot and receiver points are both corrected onto the CMP reference datum, However, the variation in the reference datum with CMP location jeopardizes the surface consistency of the statics of the shot and receiver points, which further results in the mismatch between the depth-migrated data and the velocity model and ultimately seriously affects the effect of pre-stack depth migration. In this paper, the GeoEast processing system is applied for inverse static correction of pre-stack data by low-frequency separation and the initial migration of the small smooth surface. In this way, gathers processed in the time domain are corrected back onto the floating datum. The advantages of high-frequency static correction in the time domain are retained, and the actual path of near-surface rays is thereby recovered. Then, fine surface modeling with the turning wave is adopted,and pre-stack depth migration based on the undulating surface is finally implemented with the PkirDMigOffset module of GeoEast. The proposed method greatly improves the imaging effect of complex structures on undulating land surfaces.
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