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Next-generation seismic experiments – II: wide-angle, multi-azimuth, 3-D, full-waveform inversion of sparse field data

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Title: Next-generation seismic experiments – II: wide-angle, multi-azimuth, 3-D, full-waveform inversion of sparse field data
Authors: Morgan, JV
Warner, MR
Arnoux, G
Hooft, E
Toomey, D
VanderBeek, B
Wilcock, W
Item Type: Journal Article
Abstract: 3-D full-waveform inversion (FWI) is an advanced seismic imaging technique that has been widely adopted by the oil and gas industry to obtain high-fidelity models of P-wave velocity that lead to improvements in migrated images of the reservoir. Most industrial applications of 3-D FWI model the acoustic wavefield, often account for the kinematic effect of anisotropy, and focus on matching the low-frequency component of the early arriving refractions that are most sensitive to P-wave velocity structure. Here, we have adopted the same approach in an application of 3-D acoustic, anisotropic FWI to an ocean-bottom-seismometer (OBS) field data set acquired across the Endeavour oceanic spreading centre in the northeastern Pacific. Starting models for P-wave velocity and anisotropy were obtained from traveltime tomography; during FWI, velocity is updated whereas anisotropy is kept fixed. We demonstrate that, for the Endeavour field data set, 3-D FWI is able to recover fine-scale velocity structure with a resolution that is 2–4 times better than conventional traveltime tomography. Quality assurance procedures have been employed to monitor each step of the workflow; these are time consuming but critical to the development of a successful inversion strategy. Finally, a suite of checkerboard tests has been performed which shows that the full potential resolution of FWI can be obtained if we acquire a 3-D survey with a slightly denser shot and receiver spacing than is usual for an academic experiment. We anticipate that this exciting development will encourage future seismic investigations of earth science targets that would benefit from the superior resolution offered by 3-D FWI.
Issue Date: 6-Jan-2016
Date of Acceptance: 25-Nov-2015
URI: http://hdl.handle.net/10044/1/28069
DOI: https://dx.doi.org/10.1093/gji/ggv513
ISSN: 1365-246X
Publisher: Oxford University Press (OUP)
Start Page: 1342
End Page: 1363
Journal / Book Title: Geophysical Journal International
Volume: 204
Issue: 2
Copyright Statement: C The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Natural Environment Research Council (NERC)
ConocoPhillips
BG International Limited
Maersk Olie OG Gas As
Nexen Petroleum UK Ltd
Hess Corporation
Dong E&P A/S
Tullow Oil Ltd
TGS Geophysical Company (UK) Limited
CGG Services (UK) Limited
Chevron North Sea Ltd
Woodside Energy Ltd
Statoil Petroleum AS
Funder's Grant Number: NER/T/S/2000/00183
N/A
4100005341
Service Order: 3500114397
N/A
EACPR_P40748
4501021583
4300002014
NAV 000607
3430002639
0015103726
4510240419
4503192842
Keywords: Science & Technology
Physical Sciences
Geochemistry & Geophysics
Controlled source seismology
Seismic tomography
Mid-ocean ridge processes
Crustal structure
DE-FUCA RIDGE
EAST PACIFIC RISE
ENDEAVOR SEGMENT
COBB OFFSET
PART 1
TOMOGRAPHY
ANISOTROPY
9-DEGREES-30N
NETWORK
HISTORY
0404 Geophysics
0403 Geology
0909 Geomatic Engineering
Publication Status: Published
Open Access location: http://gji.oxfordjournals.org/cgi/reprint/ggv513?%20ijkey=WSKDzhs380D2K2B&keytype=ref
Appears in Collections:Earth Science and Engineering
Faculty of Engineering