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Dive into the research topics where Winston Lewis is active.

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Featured researches published by Winston Lewis.


Seg Technical Program Expanded Abstracts | 2010

Regularization And Full-waveform Inversion: A Two-step Approach

Adriana Citlali Ramírez; Winston Lewis

Geophysical inverse problems are usually ill-posed and illconditioned, meaning that their solution is not unique and/or unstable. This kind of inverse problems can be solved using regularization techniques from optimization theory, where an additive or multiplicative regularizer will help obtain an automatic selection of a unique and stable solution for a given cost function. Regularization helps condition an inverse problem by providing the search for possible solutions with a priori information that comes from inferences about the physics of the problem. There is a toolbox of regularization techniques for inverse problems. Thus, it is necessary to assess the effect of different regularizers and different a priori information to select the best combination for the problem at hand. In this expanded abstract, we focus on regularization techniques aimed at stabilizing and improving the model estimated through full waveform inversion by adopting a two-step approach in light of the computational challenges posed by inverting for large 3D models.


Seg Technical Program Expanded Abstracts | 2012

A level set approach to salt geometry inversion in full-waveform inversion

Winston Lewis; Bill Starr; Denes Vigh


Geophysical Journal International | 2016

A numerically exact local solver applied to salt boundary inversion in seismic full-waveform inversion

Bram Willemsen; Alison E. Malcolm; Winston Lewis


Geophysics | 2016

Earth-model building from shallow to deep with full-waveform inversion

Denes Vigh; Kun Jiao; Xin Cheng; Dong Sun; Winston Lewis


Seg Technical Program Expanded Abstracts | 2016

Least-squares reverse time migration with structure preconditioning

Wei Dai; Winston Lewis; Kun Jiao; Richard T. Coates


Seg Technical Program Expanded Abstracts | 2016

3D salt geometry inversion in full-waveform inversion using a level-set method

Winston Lewis; Denes Vigh


Seg Technical Program Expanded Abstracts | 2015

Toward target-oriented FWI: An exact local wave solver applied to salt boundary inversion

Bram Willemsen; Winston Lewis; Alison E. Malcolm


Archive | 2012

PARAMETERIZING A GEOLOGICAL SUBSURFACE FEATURE

Winston Lewis; Eugene William Starr; Jason Dressel


Seg Technical Program Expanded Abstracts | 2017

Deep learning prior models from seismic images for full-waveform inversion

Winston Lewis; Denes Vigh


Seg Technical Program Expanded Abstracts | 2015

Introducing well Constraints in full Waveform Inversion and its Applications in Time-Lapse Seismic Measurements

Denes Vigh; Winston Lewis; Chirag Parekh; Kun Jiao; Jerry Kapoor

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Bram Willemsen

Massachusetts Institute of Technology

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Alison E. Malcolm

Memorial University of Newfoundland

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