Monthly Luncheon With Guest Speaker Mike Perz of TGS

03/07/2019 @ 11:30 am – 1:00 pm

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Date(s) - 03/07/2019
11:30 am - 1:00 pm

Wynkoop Brewery

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Please Join Us March 7th, 2019

With Guest Speaker Mike Perz of TGS

The Luncheon will be located at Wynkoop Brewery in downtown

1634 18th Street in Denver

Arrive at 11:30 for registration

Talk starts promptly at 12:00

Shallow PSDM velocity model building for unconventionals: a synthetic study


It is well-known that traveltime distortion due to near-surface heterogeneity poses a major challenge in land seismic imaging. Addressing this problem is particularly important in unconventional plays, where accurate depthing of subtle features is crucial for applications such as steering optimization and hazard avoidance.  While the processing industry continues to struggle with the challenge, some notable advances have been made in recent years including the use of novel refraction statics techniques, application of full-waveform inversion, as well as incorporation of potential field data, all of which seek to better elucidate complexity in near-surface velocities. At the same time as these shallow-velocity-estimation improvements are unfolding, pre-stack depth migration for unconventionals is gaining popularity to the point of becoming commonplace in many North American shale plays.  Despite this routine use of PSDM, confusion abounds on the topic of how to best incorporate our improved near-surface velocity estimates into the PSDM shallow-model-building process. This talk promises to eradicate the confusion through use of a carefully-controlled synthetic experiment in which the (known) near-surface velocity distribution mimics typical Permian Basin shallow geology. The talk will address common comments/questions/misconceptions such as:

  • “Inserting my refraction-based velocity estimate into the shallow PSDM model doesn’t work well in practice even though it’s a theoretically pleasing process.”
  • “What part of my shallow velocity estimate should go into my PSDM model versus what part should be applied to my data in the form of a static correction?
  • “The thing that matters the most is to migrate from topography instead of from flat datum”

Although the talk focuses on synthetic data, it will be punctuated by real data examples.




Bookings are closed for this event.