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Reverse time migration of order-divided multiples based on seismic interferometry |
ZHANG Hong1( ), JIANG Da-Jian1, LIU Xin2,3( ), NIU Yun-Bo2,3, LI Zhen-Chun2,3, XU Kai1 |
1. Research Institute of Geophysical Technology, Petroleum Exploration and Production Research Institute,SINOPEC, Beijing 100083, China 2. State Key Laboratory of Deep Oil and Gas, China University of Petroleum(East China), Qingdao 266580, China 3. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China |
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Abstract High-velocity salt domes and steeply dipping structures in subsurface media pose challenges to conventional imaging methods.In conventional seismic exploration,multiples are usually treated as noise to be suppressed or eliminated.However,due to their long propagation paths and smaller reflection angles within subsurface media,multiples show a wider imaging range and richer information on subsurface structures.Since seismic interferometry enables accurate prediction of multiples,the reverse time migration(RTM) of multiples based on seismic interferometry is crucial for imaging complex subsurface structures.Based on the analysis of the fundamental principles of seismic interferometry,this study derived the corresponding equations and algorithms.Furthermore,this study proposed a multiple prediction technique based on seismic interferometry.By circumventing conventional multiple processing methods,this technique enhances imaging efficiency, providing a research basis for subsequent RTM of multiples.To address the significant crosstalk noise in conventional RTM,this study innovatively utilized seismic interferometry to explore the RTM of order-divided multiples.Finally,this study proposed a RTM method for order-divided multiples based on seismic interferometry,effectively mitigating the problem of crosstalk noise in multiple imaging.Numerical experiments show that compared to the RTM of primary waves,the RTM of multiples exhibited significant improvements in imaging pre-salt structures.The RTM of order-divided multiples based on seismic interferometry could further suppress the crosstalk noise in conventional RTM,enabling accurate imaging of complex pre-salt structures and improving imaging resolution.
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Received: 24 July 2024
Published: 07 August 2025
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Model diagram for deriving reciprocity theorem
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Schematic diagram of stationary-phase point
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Schematic of multiple construction based on seismic interference
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Test results of layered model a—layered velocity model;b—primary shot record;c—original record;d—predicted multiples shot record
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Test results of non-layered model a—non-layered velocity model;b—primary shot record;c—original record;d—predicted multiples shot record
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Test results of Sigsbee2B model a—Sigsbee2B model;b—primary shot record;c—original record;d—predicted multiples shot record
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震源波场 | 检波点波场 | 一阶多次波 | 二阶多次波 | 三阶多次波 | 一次反射波 | 成像 | 假象 | 假象 | 一阶多次波 | 无成像 | 成像 | 假象 | 二阶多次波 | 无成像 | 无成像 | 成像 |
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Imaging conditions of multiple inverse time migration
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Steps for order-separated reverse time migration of multiples
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Comparison of reverse time migration results for multiples based on the Sigsbee2B model
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Comparison of migration results of the actual work area
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