VSP survey assists in the characterization of deep‐water turbiditic reservoir offshore Brazil

Using Free Surface VSP Downgoing Multiples to Obtain Unconventional VSP Image Above the Well Trajectory - A Case Study in Offshore Vietnam

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The Vertical Seismic Profile (VSP) technique is routinely used to create seismic images near the wellbore; traditionally, only the up-going wavefield is used to image the subsurface below the receivers. In very deep water, the seafloor-sea surface multiple is completely separated in time from the air gun signature and is out of the time range of the conventional processing and interpretation steps.By using the deepwater surface-related VSP multiples and the mirror-imaging technique, the VSP image was extended successfully above the well trajectory upward to the seafloor and shows a good correlation with the surface seismic section (Marques et al, 2011). The objective of this study was to produce a seismic image above the top receiver depth up to the seafloor by using the downgoing multiples recorded in the VSP data for a more complete seismic-to-well tie.

In VSP acquisition, the seismic source is positioned below Mean Sea Level and deployed above a downhole receiver.

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“…By using the deepwater surface-related VSP multiples and the mirror-imaging technique, the VSP image was extended successfully above the well trajectory upward to the seafloor and shows a good correlation with the surface seismic section (Marques et al, 2011). We present a case study using the sea surface downgoing multiples for this unconventional VSP imaging technique.…”