Seismic data stacking based on time-varying mapping
YUE Yubo1, ZHANG Jianlei1, ZHANG Chao-yang1, SHI Yunyan2, XIONG Yanrong3, SUN Pengfei4
1. R&D Center, BGP, CNPC, Zhuozhou, Hebei 072751, China; 2. BGP Seismic Data Processing Center, Zhuozhou, Hebei 072751, China; 3. BGP Acquisition Technology Center, Zhuozhou, Hebei 072751, China; 4. School of Earth Science and Engineering, Hebei University of Engineering, Handan, Hebei 056038, China
Abstract：Due to the existence of large source-receiver elevation differences in ocean-bottom-node (OBN) and mountain data,conventional common-midpoint (CMP) stacking based on an assumption of horizontal land surface is no longer feasible.We propose common reflection point (CRP) stacking based on time-varying data mapping as an alternative.We use stacking velocity to calculate time-va-rying CRP sampling points in output sections.At each CRP sampling point,two-way time is calcula-ted using a modified double-square-root formula for NMO correction.We can use this method to improve stacking quality for OBN and mountain data,and we also can obtain accurate stacking velocity for subsequent processing.Model and field data tests show that CRP stacking based on time-va-rying data mapping is better than CMP stacking.
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