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Method of subsalt velocity analysis by combining wave equation based redatuming and kirchhoff based migration velocity analysis
Method of subsalt velocity analysis by combining wave equation based redatuming and kirchhoff based migration velocity analysis
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机译：结合基于波动方程的重新基准和基于基尔霍夫的迁移速度分析的盐下速度分析方法
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摘要
A low-cost general method to perform subsalt velocity analysis is provided. For instances where sediment velocity structure is relatively simple, the method includes a single one-time redatuming to the base of salt, using existing prestack wave equation tools. For instances where the sediment velocity structure has a variable topography, the method includes multi-step redatuming to the base of salt. The method is designed to completely remove the salt-sediment overburden effects, and redatum the surface seismic data to a flat arbitrary subsalt datum, removing the complexity of the wavefield caused by the salt bodies. Once having obtained a simplified wavefield by stripping off the effects of the complex overburden, less expensive Kirchhoff imaging algorithms are employed for performing subsalt velocity model building.
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