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

Andrew Ratcliffe, Antonio Privitera, Graham Conroy, Vetle Vinje, Alexandre Bertrand and Bjarne Lyngnes
Enhanced imaging with high-resolution full-waveform inversion and reverse time migration; a North Sea OBC case study (in Imaging migration, Biondo Biondi (prefacer), Dave Nichols (prefacer) and Paul Sava (prefacer))
Leading Edge (Tulsa, OK) (September 2014) 33 (9): 986-992

Abstract

In a case study from the Tommeliten Alpha area of the Norwegian North Sea, imaging problems were caused by the presence of gas in the overburden. In particular, a large part of the reservoir is in a seismically obscured area (SOA) caused by the gas. Full-waveform inversion (FWI) and reverse time migration (RTM) dramatically improve the imaging from ocean-bottom cable (OBC) acquisition over the region. The FWI algorithm is pushed to 22 Hz to generate an extremely high-resolution velocity model, and RTM then becomes required to honor the complexity in the resultant velocity model. Consequently, migration is done with the FWI model to generate a high-frequency RTM image to 80 Hz. This image is approximately double the maximum frequency commonly used for RTM in the North Sea and matches that of equivalent Kirchhoff products, but with all the benefits in imaging that RTM brings, providing a subsequent impact on interpretation of the area.


ISSN: 1070-485X
EISSN: 1938-3789
Serial Title: Leading Edge (Tulsa, OK)
Serial Volume: 33
Serial Issue: 9
Title: Enhanced imaging with high-resolution full-waveform inversion and reverse time migration; a North Sea OBC case study
Title: Imaging migration
Author(s): Ratcliffe, AndrewPrivitera, AntonioConroy, GrahamVinje, VetleBertrand, AlexandreLyngnes, Bjarne
Author(s): Biondi, Biondoprefacer
Author(s): Nichols, Daveprefacer
Author(s): Sava, Paulprefacer
Affiliation: CGG, International
Pages: 986-992
Published: 201409
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 6
Accession Number: 2014-091311
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
N58°00'00" - N71°00'00", E04°00'00" - E31°00'00"
Secondary Affiliation: ConocoPhillips, III, International
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201447
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