Session

14.09.2017     10:00–12:00

Title:
MS71
Level-set methods for inverse problems in the geosciences – seismic inversion • Part I
Type:
Subsurface models (cryoshpere, hydrosphere, lithosphere, pedoshpere)
Room:

Detailed characterizations of the subsurface can be obtained from geophysical measurements by solving an inverse problem. As with many inverse problems, regularization is required to render the problem well-posed. Because subsurface medium-properties can vary discontinuously on various scales, standard Tikhonov regularization is often not appropriate. More advanced regularization terms such as (generalized) Total Variation adress this issue to some extent, but may fail to capture certain types of prior information. For instance, in the presence of subsurface salt bodies, the medium can be split into two distinct parts; the salt body and the surrounding sediment. The medium parameters inside the salt body are (almost) constant, while those in the surrounding sediment can vary over a large range. Such structure can be captured by means of a level-set function. In this mini-symposium, we intend to bring together experts on level-set methods for inverse problems and geophysical inversion to discuss the state-of-the-art in methods and theoretical results. Part I of the symposium focuses on seismic imaging in the presence of salt bodies, while part II focuses on multi-physics inversion.

14.09.2017
10:00–12:00

Title:
MS71
Level-set methods for inverse problems in the geosciences – seismic inversion • Part I
Type:
Subsurface models (cryoshpere, hydrosphere, lithosphere, pedoshpere)
Room:

Detailed characterizations of the subsurface can be obtained from geophysical measurements by solving an inverse problem. As with many inverse problems, regularization is required to render the problem well-posed. Because subsurface medium-properties can vary discontinuously on various scales, standard Tikhonov regularization is often not appropriate. More advanced regularization terms such as (generalized) Total Variation adress this issue to some extent, but may fail to capture certain types of prior information. For instance, in the presence of subsurface salt bodies, the medium can be split into two distinct parts; the salt body and the surrounding sediment. The medium parameters inside the salt body are (almost) constant, while those in the surrounding sediment can vary over a large range. Such structure can be captured by means of a level-set function. In this mini-symposium, we intend to bring together experts on level-set methods for inverse problems and geophysical inversion to discuss the state-of-the-art in methods and theoretical results. Part I of the symposium focuses on seismic imaging in the presence of salt bodies, while part II focuses on multi-physics inversion.


10:00–10:20
O362 Salt reconstruction with full waveform inversion and a parametric level-set method
Ajinkya Kadu (Utrecht/NL)


10:20–10:40
O363 Using second order information for updating salt body boundaries with level sets
Taylor Dahlke (Stanford/US)


10:40–11:00
O364 A level set method for seismic full waveform inversion in 2D
Yifan Wu (Manchester/GB)


11:00–11:20
O365 A level set ensemble Kalman filter method for history matching of production data incorporating electromagnetics
Clement Etienam (Manchester/GB)


11:20–11:40
O366 Joint inversion of gravity and traveltime data using a level-set based structural parametrization
Wenbin Li (East Lansing/US)


11:40–12:00
O367 Fractional differential operators to detect multi-scale geophysical features
Bart van Bloemen Waanders (Albuquerque/US)