Staining algorithm-based reverse time migration imaging for pre-salt structures
The reverse time migration(RTM)technique can accurately simulate the propagation of seismic waves in subsurface media and image subsurface structures.However,seismic waves can be reflected,refracted,or scattered in weakly illuminated areas,leading to locally reduced signal-to-noise ratios(SNRs)in RTM imaging results.The staining algorithm can achieve the tracking and imaging of known geobodies by generalizing the wave equation to the complex domain.It requires a conventional real velocity and an imaginary ve-locity field as inputs.A conventional staining algorithm requires known real subsurface structures,which is impractical in this study.Hence,this study put forward regional staining to promote the practical development of the staining algorithm.Focusing on subsalt ima-ging,this study proposed a staining algorithm-based RTM imaging method for subsalt structures.The salt dome model demonstrated that the method proposed in this study can significantly improve the imaging SNRs and resolution of self-selected target regions.
illumination improvementstaining algorithmreverse time migrationpre-salt imaging
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