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Imaging dipping sediments at a salt dome flank -VSP seismic interferometry and reverse-time Rongrong Lu*, Mark Willis, Xander Campman, Jonathan Ajo-Franklin, M. Nafi Toksz, ERL, MIT
 

Summary: Imaging dipping sediments at a salt dome flank - VSP seismic interferometry and reverse-time
migration
Rongrong Lu*, Mark Willis, Xander Campman, Jonathan Ajo-Franklin, M. Nafi Toksöz, ERL, MIT
Summary
We present results of applying seismic interferometry to
image dipping sediments abutting a salt dome. We create a
set of synthetic traces representing a multi-level, walk away
Vertical Seismic Profile (VSP) for a model composed of a
simplified Gulf of Mexico vertical-velocity gradient and an
embedded overhanging salt dome. The sediment reflectors
in the model dip up towards the salt dome flank. To process
these data, we create a set of redatummed traces using
seismic interferometry. This is done without having to
perform any velocity analysis or moveout corrections. Each
of these redatummed traces mimics the output of a down-
hole source and down-hole receiver pair. The linear v(z)
gradient enables the redattumed data set to illuminate and
capture reflections from both the salt-dome flank and the
upward turning sediments. We then apply pre-stack depth
migration to these traces to produce the final image of the

  

Source: Ajo-Franklin, Jonathan - Earth Sciences Division, Lawrence Berkeley National Laboratory

 

Collections: Geosciences