A Study on the Effect of Least-squares Datuming on VSP Multiple Imaging
A. Aldawood, I. Hoteit, G. Turkiyyah and T. Alkhalifah
Event name: 77th EAGE Conference and Exhibition - Workshops
Session: WS15 - Imaging, Characterization and Monitoring Using Interferometric Methods - Recent Developments
Publication date: 01 June 2015
Info: Extended abstract, PDF ( 515.29Kb )
Price: € 20
Interferometric transformations are widely applied to transform seismic data from one acquisition geometry to another. We used a correlation-type interferometric transformation to redatum vertical-seismic-profiling surface-related multiples into surface-seismic virtual primaries. Conventional redatuming, based on the cross-correlation of seismic traces, yields virtual surface-seismic records that suffer from correlation artefacts, wavelet distortion, and low-temporal resolution. These effects are mainly caused by the limited recording aperture, the band-limited nature of the source wavelet, and the coarse source-receiver sampling. Least-squares migration of the virtual surface-seismic gathers can partially enhance the seismic resolution of the final migrated sections. However, our results demonstrate that the least-squares datuming step remarkably helps suppress the cross-correlation artefacts, enhance the resolution of the seismic events, and properly deconvolve the source wavelet. Therefore, the computed migrated sections suggest that least-squares datuming can be an essential processing step to apply to VSP surface-related multiples prior to imaging subsurface structures.