80th EAGE Conference & Exhibition 2018

Opportunities presented by the energy transition

11 - 14 June
Copenhagen, Denmark
Closing soon
Call for papers

Seismic Imaging with Ray and Waves - Where do we stand? Part II: Imaging


Monday 11 June 2018

Title: Seismic Imaging with Ray and Waves - Where do we stand? Part II: Imaging
Room: A
Convenors: R. Brossier (Université Grenoble Alpes)
R. Plessix (Shell) 
P. Routh (ExxonMobil)


Workshop Description

Full waveform inversion in conjunction with ray-based tomography is nowadays commonly used to obtain the background model needed for imaging. In addition, FWI could potentially replace the common workflow of migration followed by elastic impedance inversion, so as to directly deliver impedance volumes. However, the use of FWI raises a number of questions. For instance, over the last three decades, we have moved from post-migration to pre-stack migration to capture the amplitude variations with angle and hence estimated the compressional and shear impedance variations crucial for reservoir characterization. However, most of the current high-resolution FWI are run acoustically, notably for computational cost reasons. What is then the value of the high-resolution acoustic imaging obtained by FWI? Are the elastic effects problematic? This FWI approach questions the commonly used acoustic assumption and the full wave modeling approach. Is the linearization approach around an acoustic background a more practical approach, as is commonly done with migration? Do we see value of the full wave modeling in presence of multiples? How do the FWI impedance estimates compare with the traditional migration + stratigraphic inversion approach where geological and sparsity constraints are generally added?

During this workshop, we propose to review the high-resolution FWI approach in comparison to the ‘migration + stratigraphic’ approach. We would also like to discuss the challenges encounter by both approaches.

Who should attend

Researchers interested in seismic imaging and seismic velocities.

Workshop Programme

Morning Session: Migration, velocity and examples
08:30 Introduction
Session 1.A: Reflectivity and velocity
08:40 Using One-way Propagators to Build a Full Wafefield Inversion Process
E. Verschuur* (Delft Univ. of Technology), M. Davydenko (Delft Univ. of Technology), A. Garg (Delft Univ. of Technology)
09:05 FWI Velocity Models for Quantitative Interpretation of a Deep Water GOM Dataset
C. Calderon-Macias* (ION), Y. Cobo (ION)
09:30 Target-oriented Elastic Full-waveform Inversion through Acoustic Extended Migration Redatuming
E. Biondi* (Stanford Univ.), B. Biondi (Stanford Univ.), G. Barnier (Stanford Univ.)
09:55 Discussion
10:10 Coffee break 
Session 1.B: Least-square Migration, Inversion and examples
10:25 Review of Different Expressions for the Extended Born Approximate Inverse Operator
H. Chauris* (MINES ParisTech), E. Cocher (MINES ParisTech)
10:50 Least-squares Imaging with Multiples
R. Soubaras* (CGG), B. Gratacos (CGG)
11:15 Least-squares Reverse-time Migration with Dynamic Time Warping
W. Dai* (Schlumberger), X. Cheng (Schlumberger), K. Jiao (Schlumberger), D. Vigh (Schlumberger)
11:40 Discussion
11:55 Lunch break
Afternoon Session: Multi-parameters
13:00  Introduction
Session 2.A: Taking viscous effect into account
13:10 Recent Advances in Q-model Building and Q-compensating Migration for Imaging in the Presence of Complex Gas Clouds using P-waves
Y. Xie* (CGG), M. Wang (CGG), B. Xiao (CGG), A. Ratcliffe (CGG), T. Latter (CGG)
13:35 Q-tomography with Ray and Waves
Y. Shen* (Shell), K. Bao (Shell), H. Kuehl (Shell)
14:00 Q-least-squares Reverse Time Migration with Viscoacoustic Deblurring Filters
Y. Chen (KAUST), G. Schuster* (KAUST)
14:25 Discussion
14:40 Coffee break
Session 2.B: Elasticity and reservoir
14:55 4D Seismic Coda Waves
D. Lumley (Univ. of Texas at Dallas)
15:20 Multiple-parameters Inversion - Enhancing wave-matter interaction
J. Virieux* (Univ. Grenoble Alpes), R. Brossier (Univ. Grenoble Alpes), L. Métivier (CNRS, Univ. Grenoble Alpes, LJK), P. Trinh (Univ. Grenoble Alpes, ISTerre; Total E&P), W. Zhou (Univ. Texas, Dallas), P. Yang (Univ. Grenoble Alpes, ISTerre)
15:45 Discussion
16:00 End of workshop 

Please note that this programme is subject to change.