New Directions for Broadband Processing

Workshop 8: Monday, 3 June
Convener: Malcolm Francis (Schlumberger) 
Xander Campman (Shell)
James Rickett (Schlumberger)
Gary Hampson (DUG)
Gordon Poole (CGG)

Description:

The broadband revolution is complete and broadband seismic acquisition ubiquitous. It has given us a step change in quality of marine seismic data, driven partly by new acquisition methods, and partly by processing and imaging algorithms that more aggressively address the deficiencies in our data. As it was evolving, the notion of “broadband” challenged geophysicists to rethink their assumptions on what could be done with data processing.  We look to continue this mindset by challenging what are now the conventional assumptions of broadband processing. 

Specific issues that we look to cover include:

  • Broadband-at-depth: How can we get the resolution we need at the targets we care about?
    • What limits us on the low end, and can we accurately process 2Hz data even if we have it?
    • What limits us on the high end? Is it really seismic attenuation, or is it the difficulties in preserving the high temporal and spatial frequencies during processing?

  • Are our models sufficient to capture the important physics?
    • What physical perturbations do we need to do to include in our models: rough seas, water column variability? And can we resolve these parameters sufficiently?
    • Attenuation: Are tomographic attenuation models delivering in terms of resolution?
    • Beyond plane-waves: Much of today’s processing is based on sparse local tau-p decompositions. How can we effectively get beyond this, and how can we handle the extra parameters that very high-dimensional model spaces that result in a cost-effective manner?
    • Broadband FWI: How far are we from this? Should perturbations be removed by pre-processing or included in more sophisticated modelling?
  • Richer datasets:
    • What processing challenges and opportunities are presented by non-conventional streamer configurations?
    • Are we using near-field hydrophone measurements to their maximum? Can they complement conventional receiver spreads?

 

Workshop Programme:

08:55Introduction
Session: Broadband Acquisition
Chairs: G. Poole (CGG) & G. Hampson (DUG)
09:00How High Can We Go? Pushing Limits of Lateral and Vertical Resolution in Deepwater Seismic
P. Hatchell (Shell)
09:20Imaging with Near-Field Hydrophones
P. Nevill (Chevron UK)
09:40Red Ghosts and Broadband Processing
S. Ronen (Totum Geosolutions)
10:00Broadband De-signature for Air-gun Arrays
R. Telling (Shearwater GeoServices)
10:20Discussion
10:30Coffee break
Session: BB Processing and Hererogeneity
Chairs: J. Rickett (Schlumberger) & G. Poole (CGG)
10:50New Wave Seismics
K. Sheen (Exeter University)
11:10Finite Difference Modelling Including Dynamic Speed of Sound in Water
K. Davies (Chevron UK)
11:30Why 4D broadband is the next standard for reservoir monitoring studies?
D. Lecerf (PGS)
11:50Discussion
12:00Lunch break 
Session: Broadband Waveform Inversion
Chairs: J. Rickett (Schlumberger) & X. Campman (Shell)
13:00Multi-Parameter Waveform Inversion Using Broadband Data from the North West Shelf of Western Australia
C. Manuel (Chevron)
13:20High-frequency Full-waveform Inversion: Just how high should you go?
A. Ratcliffe (CGG)
13:40Low Frequencies Unlock Visco-Acoustic Full Waveform Inversion Capability in Trinidad
C. Theriot (Shell)
14:00Broadband FAZ Land Aata: An opportunity for FWI
O. Hermant (CGG)
14:20Discussion
14:30Coffee break
14:50Does Broadband Address the Cycle Skipping in Complex Areas?
D. Vigh (Schlumberger)
15:10Towards Lateral Broadband
R. Soubaras (CGG)
15:30Imaging including internal multiples: influence of broadband acquisition
E. Verschuur (TU Delft)
15:50Discussion
16:00End of Workshop

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