Multi-parameter imaging and inversion: applications, strategies, and outstanding questions

Workshop 6
6 June 2022
Room B
Conveners: Hervé Chauris (MINES ParisTech)
Anatoly Baumstein (ExxonMobil Upstream Research Company)
Alison Malcolm (Memorial University of Newfoundland)

Workshop Description

Traditional single-parameter imaging and inversion, which has historically been relied upon for the bulk of seismic processing applications, is now understood to be too limiting when recovering quantitative information about subsurface properties. In particular, constant-density acoustic model-based approaches are being superseded by methods that incorporate angle-dependent reflectivity, variable density, elasticity, attenuation, and even poro-elasticity. The objective of this workshop is to review these recent advances and to better understand the most successful strategies, as well as the inherent limitations of imaging/inversion with seismic data as it is currently acquired.

Key questions the workshop intends to address include:

  1. What types of acquisition geometries (towed-streamer marine, OBS, VSP, DAS, land) and 
datatypes (single- and multi-component) are required for accurate recovery of various
subsurface properties?
  2. What are the recommended parameterisations and strategies for resolving the intrinsic 
ambiguity between various elastic properties?
  3. What are the recommended computational strategies (e.g., second-order optimization 
methods)for decoupling possible trade-offs between parameters?
  4. How can we use our geophysical understanding of seismic data to select the most 
appropriate subsets and types of data to retrieve the desired information?
  5. Which regularization strategies are the most effective? What role can machine learning play 
in reducing the null-space and incorporating rock-physics and geological priors?
  6. Can uncertainties and trade-offs be quantified for large-scale 3D imaging and inversion
applications
  7. What real-life examples illustrating both successes and challenges of multi-parameter 
inversion and imaging do we have?
  8. What impact can quantitative recovery of previously neglected elastic properties have on 
making better business decisions?

Participant Profile

Researchers, practitioners, students, and decision makers interested in better understanding how quantitative seismic imaging and inversion can unlock additional value hidden in seismic data.  
Workshop Programme


Morning Session

9:00Introduction
9:15A brief introduction to multi-parameter full-waveform inversion  R.E Plessix (Shell)
09:55Discussion
10:05Coffee break
10:20Searching the parameter space for resolution and uniqueness in elastic anisotropic waveform inversion: What can redumating and machine learning offer? T. Alkhalifah (KAUST)
10:40Resolution of VTI anisotropy with elastic full-waveform inversion O. Podgornova (Schlumberger)
11:00Viscoelastic Full Waveform Inversion by Alternating Direction Method of Multipliers K. Aghazade (University of Tehran)
11:20
Attenuation sensitivity kernel calculation in anelastic wave equation tomography W. Pan (Institute of Geology and Geophysics, Chinese Academy of Sciences)
11:40Value of multi-parameter FWI. P.-T. Trinh (Total)
12:00Discussion 
12:15Lunch
13:15Multi-parameter model building using global full-waveform inversion   M. Warner (Imperial College)

13:35Multi-parameter elastic full waveform inversion for subsurface property estimation. A. Baumstein (ExxonMobil Upstream Research Company)
13:55Elastic FWI to directly estimate subsurface elastic properties in sub-salt environment – field data example P. Routh (ExxonMobil Upstream Research Company)
14:15Elastic Full-Waveform Inversion for Improved Salt Model Building in the Central North Sea. N. Masmoudi (CGG)
14:35Constant- versus variable-density asymptotic linearized direct waveform inversion: a case study from an Australian variable-depth streamer seismic datasetM. Farshad (CGG)
14:55Discussion
15:10Coffee break
15:25Elastic waveform inversion of fiberoptic and accelerometer VSP data in a shallow CO2 injection setting K.Innanen (University of Calgary)
15:45Towards stable S-wave velocity estimation using non-isotropic sources and DAS R. Nakata (University of Tokyo)
16:05Target-oriented elastic full-waveform inversion B. Biondi (Stanford University)
16:25Application of targeted elastic RTM to a medical imaging problem A. Malcolm (Memorial University of Newfoundland)
16:45Discussion and closing remarks


Main Sponsors