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SUMMARY Seismic interferometry allows one to create a virtual source inside a medium, assuming a receiver is present at the position of the virtual source. We discuss a method that creates a virtual source inside a medium from reflection data measured at the surface, without needing a receiver inside the medium and, hence, going beyond seismic interferometry. In addition to the reflection data, an estimate of the direct arrivals is required. However, no information about the medium is needed. We analyze the proposed method for a simple configuration using physical arguments based on the stationary-phase method and show that the retrieved virtual-source response correctly contains the multiples due to the inhomogeneous medium. The proposed method can serve as a basis for data-driven suppression of internal multiples in seismic imaging.
Focusing Inside an Unknown Medium Using Reflection Data With Internal Multiples: Numerical Examples for a Laterally-Varying Velocity Model, Spatially-Extended Virtual Source, and Inaccurate Direct Arrivals
Broggini, Filippo (Colorado School of Mines) | Snieder, Roel (Colorado School of Mines) | Wapenaar, Kees (Delft University of Technology)
SUMMARY Seismic interferometry is a technique that allows one to reconstruct the full response from a virtual source inside a medium, assuming a receiver is present at the virtual source location. We describe a method that creates a virtual source inside a medium from reflection data measured at the surface, without needing a receiver inside the medium and, hence, presenting an advantage over seismic interferometry. An estimate of the direct arriving wavefront is required in addition to the reflection data. However, no information about the medium is needed. We illustrate the method with numerical examples in a lossless acoustic medium with laterally-varying velocity and density and take into consideration finite acquisition aperture and a spatially-extended virtual source. We examine the reconstructed wavefield when a macro model is used to estimate the direct arrivals. The proposed method can serve as a basis for data-driven suppression of internal multiples in seismic imaging.
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.65)