Apr 20th- CANCELLED North Tech Lunch: CANCELLED Full Waveform Inversion With Steerable Variation Regularization*

Tue Apr 19th-West Tech Lunch:
Meeting Location:
Southwestern Energy Conference Center
10000 Energy Drive
Spring, TX   77389
(Free parking)

Meeting Time:
11:00 to 12:30 pm 
*Registration Begins at 11:00
**Buffet Lunch line will open at 11:15
**Presentation starts at 12:00

NOTE: You Must Be Logged In to Register.

Speaker: Lingyun Qiu, PGS

We propose a new regularization scheme for Full Waveform Inversion (FWI). The new method makes use of a priori information on the spatial variability of the earth model to overcome the limitations of the inversion in the presence of high velocity contrast geobodies and cycle skipping. It comprises two additional regularization terms to the FWI objective function. The first term evaluates the L1 norm of total variation (TV) of the model, while the second term steers the solution based on local prior information of the model spatial variability. Both regularization terms can be made spatially variant to accommodate different geological features in the model, i.e. sediments (smooth changes), salt bodies (piecewise constant). Our procedure makes use of the split Bregman iterations, an effective algorithm for solving the L1 optimization problems. The result is a computationally efficient and accurate implementation. We show the potential of the method by using the BP 2004 and SEAM velocity benchmark model. There, our regularization scheme allows the inversion to start from a simple velocity model and delivers a high-quality reconstruction of salt bodies.

Speaker Biography: Lingyun Qiu, PGS
Lingyun Qiu obtained his PhD in Mathematics from Purdue University in 2013. He spent two years as an industrial postdoc jointly in ExxonMobil Research & Engineering Company at New Jersey and Institute for Mathematics and its Applications at University of Minnesota. In 2015, he began his career at Petroleum Geo-Services in Houston and worked on a variety of research topics including regularization methods for linear and non-linear inverse problems, multi-parameter full waveform inversion and optimal-transport based objective function for inversion.

Price List:
Pre-Registered Late/Walk-Up
 $35  $45
 Non-Member  $45  $55
 Student Member
 $0  $10


4/20/2017 11:00 AM - 4/20/2017 1:00 PM

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