1887

Abstract

Summary

Land walkaway VSP data acquired with vibroseis data contains abundant amounts of converted waves. Their imaging requires an accurate shear-wave velocity model that is often not available. Here, we apply seismic interferometry to create a virtual shear-wave checkshot with first arrivals representing the direct downgoing shear wave along the borehole. Testing on a field data example demonstrates the ability of the redatuming approach to reconstruct accurate virtual gathers and deliver reliable shear-wave velocity from first-break time picks. Using the retrieved shear-wave velocity profile, the mode-converted VSP field data were migrated to obtain a reliable subsurface image consistent with the image obtained from PP data.

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/content/papers/10.3997/2214-4609.201900695
2019-06-03
2024-04-16
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References

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