Challenges and Value of Applying FWI to Depth Imaging Projects

Sirgue, L.; Denel, Bertrand; Gao, F.

doi:10.3997/2214-4609.20149787

Cited by 2 publications

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“…Indirect methods such as flat common-image gathers (CIG) were developed as a response to the inability to directly solve for and adequately provide a velocity model for depth imaging, and those CIGs represent a necessary condition at the image that an accurate velocity would satisfy. References for CIGs are Anderson et al (2012), Baumstein et al (2009), Ben-Hadj-ali et al (2008, 2009), Biondi and Sava (1999), Biondi and Symes (2004), Brandsberg-Dahl et al (1999), Chavent and Jacewitz (1995), Fitchner (2011), Guasch et al (2012), Kapoor et al (2012), Rickett and Sava (2002), Sava et al (2005), Sava and Fomel (2003), Sirgue et al (2009Sirgue et al ( , 2010Sirgue et al ( , 2012, Symes and Carazzone (1991), Tarantola (1987), and Zhang and Biondi (2013). Many wrong velocity models can and will also satisfy a flat common-image-gather criterion, especially under complex imaging circumstances.…”

Section: R O U N D T a B L Ementioning

confidence: 99%

A timely and necessary antidote to indirect methods and so-called P-wave FWI

Weglein

2013

The Leading Edge

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A central purpose of this article is to bring an alternative voice, perspective, and understanding to the latest geophysical stampede, technical bubble, and self-proclaimed seismic cure-all, the so-called “full-waveform inversion” or FWI. If you think this is exaggerated, I refer to the advertisement/announcement of the 2013 SEG Workshop on FWI whose opening line is, “Full-waveform inversion has emerged as the final and ultimate solution to the Earth resolution and imaging objective.”

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Section: R O U N D T a B L Ementioning

confidence: 99%

A timely and necessary antidote to indirect methods and so-called P-wave FWI

Weglein

2013

The Leading Edge

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A direct inverse method for subsurface properties: The conceptual and practical benefit and added value in comparison with all current indirect methods, for example, amplitude-variation-with-offset and full-waveform inversion

Weglein

2017

Interpretation

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Direct inverse methods solve the problem of interest; in addition, they communicate whether the problem of interest is the problem that we (the seismic industry) need to be interested in. When a direct solution does not result in an improved drill success rate, we know that the problem we have chosen to solve is not the right problem — because the solution is direct and cannot be the issue. On the other hand, with an indirect method, if the result is not an improved drill success rate, then the issue can be either the chosen problem, or the particular choice within the plethora of indirect solution methods, or both. The inverse scattering series (ISS) is the only direct inversion method for a multidimensional subsurface. Solving a forward problem in an inverse sense is not equivalent to a direct inverse solution. All current methods for parameter estimation, e.g., amplitude-variation-with-offset and full-waveform inversion, are solving a forward problem in an inverse sense and are indirect inversion methods. The direct ISS method for determining earth material properties defines the precise data required and the algorithms that directly output earth mechanical properties. For an elastic model of the subsurface, the required data are a matrix of multicomponent data, and a complete set of shot records, with only primaries. With indirect methods, any data can be matched: one trace, one or several shot records, one component, multicomponent, with primaries only or primaries and multiples. Added to that are the innumerable choices of cost functions, generalized inverses, and local and global search engines. Direct and indirect parameter inversion are compared. The direct ISS method has more rapid convergence and a broader region of convergence. The difference in effectiveness increases as subsurface circumstances become more realistic and complex, in particular with band-limited noisy data.

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Challenges and Value of Applying FWI to Depth Imaging Projects

Cited by 2 publications

References 0 publications

A timely and necessary antidote to indirect methods and so-called P-wave FWI

A timely and necessary antidote to indirect methods and so-called P-wave FWI

A direct inverse method for subsurface properties: The conceptual and practical benefit and added value in comparison with all current indirect methods, for example, amplitude-variation-with-offset and full-waveform inversion

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