Results 161 to 170 of about 5,381 (217)
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Land FWI: Challenges and Possibilities
82nd EAGE Annual Conference & Exhibition, 2021Summary Land seismic presents more and different challenges for Full-Waveform Inversion (FWI) than marine data. Among these challenges, the most fundamental ones are the irregular topography, strong near-surface effects, and common FWI difficulties such as cycle-skipping and amplitude issues.
D. Wang +4 more
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Proceedings, 2015
Seismic anisotropy influences both the kinematics and dynamics of seismic waveforms. As such, if not taken into account properly during multi-parameter full-waveform seismic inversion (FWI), the anisotropy can manifest itself as significant error in the recovered P-wave velocity model.
H.A. Debens, M.R. Warner, A. Umpleby
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Seismic anisotropy influences both the kinematics and dynamics of seismic waveforms. As such, if not taken into account properly during multi-parameter full-waveform seismic inversion (FWI), the anisotropy can manifest itself as significant error in the recovered P-wave velocity model.
H.A. Debens, M.R. Warner, A. Umpleby
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High-Resolution Reflection FWI
Proceedings, 2018We demonstrate reflection FWI on a less-than-ideal 3D narrow-azimuth towed-streamer dataset that contains little refracted energy and that is deficit in low frequencies. We begin from a very simple starting model built rapidly from stacking velocities.
M. Warner +4 more
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Reflection FWI in MBTT Formulation
Proceedings, 2015Reflection FWI algorithm in Migration Based Travel Time (MBTT) formulation is presented. This approach is based on decomposition of the velocity model for two constituents: smooth propagator and rough depth reflector. Subsequent reformulation of the data misfit function leads to a new FWI statement.
G. Chavent +2 more
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A New Take on FWI - Wavefield Reconstruction Inversion
Proceedings, 2014We discuss a recently proposed novel method for waveform inversion: Wavefield Reconstruction Inversion (WRI). As opposed to conventional FWI – which attempts to minimize the error between observed and predicted data obtained by solving a wave equation – WRI reconstructs a wave-field from the data and extracts a model-update from this wavefield by ...
T. van Leeuwen (Tristan) +2 more
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International Meeting for Applied Geoscience & Energy, 2015
Summary Seismic anisotropy influences both the kinematics and dynamics of seismic waveforms. If anisotropy is not adequately taken into account during full-waveform seismic inversion (FWI), then inadequacies in the anisotropy model are likely to manifest as significant error in the recovered P-wave velocity model.
Henry A. Debens* +3 more
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Summary Seismic anisotropy influences both the kinematics and dynamics of seismic waveforms. If anisotropy is not adequately taken into account during full-waveform seismic inversion (FWI), then inadequacies in the anisotropy model are likely to manifest as significant error in the recovered P-wave velocity model.
Henry A. Debens* +3 more
openaire +1 more source
Macrovelocity Reconstruction by Reflection FWI
78th EAGE Conference and Exhibition 2016, 2016The paper deals with development of reliable techniques of full waveform inversion which guarantee correct reconstruction of a macrovelocity model for reasonable acquisitions and frequency ranges. As reasonable we mean realistic offsets (about one-two depths of target objects) and temporal frequency above 5 – 7 Hz.
V. Tcheverda, G. Chavent, K. Gadylshin
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Convergence Regions for AWI and FWI
Proceedings, 2017Cycle-skipping is the most significant local minimum FWI suffers in practice, while adaptive waveform inversion (AWI) provides a new waveform-inversion scheme which is robust against cycle-skipping. In this paper, we present an extensive test exploring the convergence properties of both FWI and AWI against cycle-skipping.
J. Yao, L. Guasch, M. Warner
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80th EAGE Conference & Exhibition 2018 Workshop Programme, 2018
The primary objective of this project was to improve the understanding of the internal structure of the Viscata and Fortuna reservoirs, and this objective was met via clearer internal imaging of these reservoir intervals and the overlying gas-charged sediments.
I.F. Jones +6 more
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The primary objective of this project was to improve the understanding of the internal structure of the Viscata and Fortuna reservoirs, and this objective was met via clearer internal imaging of these reservoir intervals and the overlying gas-charged sediments.
I.F. Jones +6 more
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Benefits of FWI Imaging and 4D FWI in the Culzean Field
Second EAGE Seabed Seismic Today Workshop, 2023I. Espin +6 more
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