High-resolution Velocity Update Using Full Waveform Inversion: A Case Study in East Breaks, Gulf of Mexico

2016 ◽  
Author(s):  
Bing Bai ◽  
Guo Yu ◽  
Sunxi Wang
Keyword(s):  
High Resolution ◽  
Gulf Of Mexico ◽  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Full Waveform

scholarly journals High Resolution Anisotropic Earth Model Building on Conventional Seismic Data Using Full Waveform Inversion: A Case Study Offshore Australia

2015 ◽  
Vol 2015 (1) ◽  
pp. 1-5
Author(s):  
Bee Jik Lim ◽  
Denes Vigh ◽  
Stephen Alwon ◽  
Saeeda Hydal ◽  
Martin Bayly ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Model Building ◽  
Waveform Inversion ◽  
Earth Model ◽  
Full Waveform Inversion ◽  
Full Waveform

Extracting geologic information directly from high-resolution full-waveform inversion velocity models — A case study from offshore Trinidad

2017 ◽  
Vol 36 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Nick Benfield ◽  
Vishram Rambaran ◽  
Joel Dowlath ◽  
Tom Sinclair ◽  
Miles Evans ◽  
...  
Keyword(s):  
High Resolution ◽  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Velocity Models ◽  
Full Waveform ◽  
Geologic Information

Enhanced imaging with high-resolution full-waveform inversion and reverse time migration: A North Sea OBC case study

2014 ◽  
Vol 33 (9) ◽  
pp. 986-992 ◽  
Author(s):  
Andrew Ratcliffe ◽  
Antonio Privitera ◽  
Graham Conroy ◽  
Vetle Vinje ◽  
Alexandre Bertrand ◽  
...  
Keyword(s):  
High Resolution ◽  
North Sea ◽  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Reverse Time ◽  
Reverse Time Migration ◽  
Full Waveform ◽  
Time Migration ◽  
Enhanced Imaging

Gas hydrate quantification using full-waveform inversion of sparse ocean-bottom seismic data: A case study from Green Canyon Block 955, Gulf of Mexico

Geophysics ◽  
2018 ◽  
Vol 83 (4) ◽  
pp. B167-B181 ◽  
Author(s):  
Jiliang Wang ◽  
Priyank Jaiswal ◽  
Seth S. Haines ◽  
Patrick E. Hart ◽  
Shiguo Wu
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Seismic Data ◽  
Waveform Inversion ◽  
Full Waveform Inversion ◽  
Ocean Bottom ◽  
Full Waveform ◽  
Sonic Log ◽  
Obs Data

We present a case study of gas hydrate quantification using dense short-offset multichannel seismic (MCS) and sparse long-offset ocean-bottom-seismometer (OBS) data in lease block Green Canyon 955 (GC955), Gulf of Mexico (GOM), where the presence of gas hydrate was interpreted using logging while drilling (LWD) data acquired by the GOM Gas Hydrate Joint Industry Project Leg II expedition. We use frequency-domain full-waveform inversion (FWI) of seven OBS gathers to invert for a P-wave velocity model of an approximately 7 km long MCS profile connecting two LWD sites, GC955-H and GC955-Q. We build the starting model for FWI using traveltime inversion (TI) of the MCS and OBS data. In addition, we use the TI model for depth migrating the MCS stack. At the LWD sites, we constrain the hydrate saturation ([Formula: see text]) using sonic and resistivity logs. Unfortunately, as is typical of seismic quantification problems, the FWI model resolution is not sufficient to extrapolate the LWD-based [Formula: see text]. Therefore, we apply Backus averaging to the sonic log, at 60 m wavelength, bringing it within approximately 8% of the FWI model and make the assumption that averaging the sonic log is same as redistributing the gas hydrate within the Backus wavelength. In this manner, instead of [Formula: see text], the FWI model is able to estimate the total gas hydrate volume. In the end, we use the FWI model and the migrated stack to constrain the locations and bulk volumes of free gas and gas hydrate. Our results demonstrate that with careful processing, reasonable estimates on locations and bulk volumes of submarine gas hydrate accumulations can be achieved even with sparse seismic data that are not adequate for amplitude-based assessments.

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