79th EAGE Conference & Exhibition 2017

Energy, Technology, Sustainability - Time to open a new Chapter

Date
12 - 15 June
Location
Paris, France
Registration
Closed
Call for papers
Closed

Workshop 9: Velocity Model Building - Full Wave vs Kinematic Approaches

WS09 Monday 12 June
 Title: Velocity Model Building - Full Wave vs Kinematic Approaches (FWI vs MVA)
 Room: C3
 Convenors: G. Lambaré (CGG)
R.E. Plessix (Shell)
J. Virieux (Universite Grenoble Alpes)


Workshop Description

In the mid 80’s, Full Waveform Inversion (FWI) promised to be equivalent to tomography plus migration. However, in spite of various successful stories around the turn of the new century on synthetics and on real data when both reflections and diving waves (refractions) are available, limitations have been identified such that the cycle skipping issue or the missing longwavelength components of the velocity model when only reflected waves are presented in the data. Reformulations of full waveform inversion have been then for these two purposes, i.e. relaxing sensitivity to cycle skipping, building longwavelength components of the velocity model from reflected waves. Concerning this second aspect it has been proposed to capture reflection traveltime information in a waveform inversion manner, leading to different automatic migration velocity analysis. While promising these approaches are challenging in practice. During this workshop, we will like to review the concepts developed in the 80’s and 90’s, then discuss the recent developments and notably the attempts to invert simultaneously reflections and refractions.

Workshop Programme

09:00 Introduction
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Session 1: Overview
09:05 Data Space Reflectivity and the Migration based Travel Time approach to FWI
G. Chavent* (Inria Paris)
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09:40 Extended Waveform Inversion
B. Symes* (Rice University)
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10:15 Discussion
Session 2: Methods/Examples
10:30 Optimizing the Coefficients of the Leading Terms of the Born Series - FWI + MVA + more
T. Alkhalifah* (KAUST)
10:50 FWI for Elastic Media - Macrovelocity reconstruction
V. Cheverda* (IPGG), G. Chavent (Inria Paris), K. Gadykshin (IPGG)
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11:10
Extending the Reach of FWI with Reflection Data - Potential and challenges
A. Gomes* (CGG), N. Chazalnoel (CGG)
11:30
Elastic Wavefield Tomography with Physical Constraints
B. Biondi* (Stanford University), A. Almomin (Saudi Aramco), R. Sarkar (Stanford University)
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11:50 Discussion
12:10 Lunch
Session 3: Applications
 13:15 Introduction of the afternoon
13:20
Advances in and Challenges for Broadband Multiparameter Full Waveform Inversion 
U. Albertin* (Chevron)
13:40 Reflection FWI without a Good Starting Model 
M.Warner* (Imperial College London)
14:00
Updating Velocity Fields beyond the Diving Waves
D. Vigh* (Schlumberger), K. Jiao (WesternGeco), D. Sun (WesternGeco), X. Cheng (WesternGeco)
14:20 Wave-Equation Migration Velocity Analysis in the Surface Common Offset Domain - Application to Viking Graben Field Data
P. Nandi* (Rice University), U. Albertin (Chevron)
14:40
Discussion
Session 4: Algorithms/Methods
15:00
Mitigating the Gradient Artefacts of Migration Velocity Analysis by Gauss-Newton Update
R. Soubaras* (CGG), B. Gratacos (CGG)
15:20
Image-domain versus Data-domain Velocity Analysis based on True-amplitude Subsurface Extended Migration
H. Chauris* (Mines ParisTech), Y. Li (Mines ParisTech), E. Cocher (Mines ParisTech)
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15:40
Reflection Waveform Inversion Method - Solutions to the reflectivity-background coupling problem and consequences on the convergence
R.Valensi* (Opera), R. Baina (Opera), V. Duprat (Opera)
16:00
From RWI to JFWI - Including diving waves in reflection-based velocity model building
R. Brossier* (Universite Grenoble Alpes), W. Zhou (Universite Grenoble Alpes), S. Operto (Université Cote d'Azur), J. Virieux (Universite Grenoble Alpes), P. Yang (Universite Grenoble Alpes)
16:20
Discussion
17:00 Closure