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
نویسندگان
چکیده
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.
منابع مشابه
Data-driven wavefield reconstruction and focusing for laterally-varying velocity models, spatially-extended virtual sources, and inaccurate direct arrivals
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, presenting and advantage over seismic interferometry. In addition to the reflect...
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