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Technical Content

Technical Abstract

Towards more accurate reservoir imaging using FWI: An OBN case study at Trion

SEG - Society of Exploration Geophysicists | Zhen Wang, Meisen Mei, Zhuocheng Yang (CGG) ; Joakim Blanch, Ezequiel Genova, Juan-Mauricio Florez-Nino, Humberto Salazar-Soto, Alfredo Vazquez-Cantu (PEMEX) ©2022 SEG

The Trion field in the western Gulf of Mexico (GoM) exhibits folded sediment beddings and strong attenuation bodies, which pose great challenges for seismic imaging. After a decade of processing effort employing the latest imaging technology, the available towed-streamer data for this area hit ...

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Technical Abstract

An integrated approach to develop a self-sourcing, self-sealing stratigraphic prospect for the Hanifa Formation, offshore Bahrain

SEG - Society of Exploration Geophysicists | Bleddyn Davies, Thibault Le Canu, Michael Harrison (CGG) ; Ghada Almoulani, Suresh Thampi (Tatweer Petroleum) ©2022 SEG

Targeting of stratigraphic traps is rapidly becoming a successful exploration strategy, especially in relatively mature basins where a high proportion of structural traps have been tested. The development of robust geological and trap models, integrated with the results of seismic inversion, are key steps ...

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Technical Abstract

Full Waveform Inversion in an Anisotropic Earth: a Practical Workflow

EAGE - European Association of Geoscientists and Engineers | Thibaut Allemand, Anna Sedova, Gilles Lambare, Patrice Guillaume (CGG) ; Damien Grenié (previously in CGG) ©2020 EAGE

An incorrect anisotropy in the Full Wave Inversion (FWI) velocity model leads to imperfect Common Image Gather (CIG) flatness. The main difficulty in the anisotropy estimation through FWI is the strong coupling with velocity. While FWI jointly updating velocity and anisotropy has been proposed ...

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Technical Abstract

FWI for the complex Walker Ridge salt province using streamer data

SEG - Society of Exploration Geophysicists | Dorothy Ren, Xin He, Siyun Xu, Fei Gao, Feng Lin, Jiawei Mei ©2022 SEG

Monument field is located in the northwest part of Walker Ridge in the Gulf of Mexico, with a Paleogene sandstone reservoir ?9 km below sea surface. The complicated overburden of low reflectivity shale bodies and complex salt geometries with steep salt flanks, multi-level weld ...

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Technical Abstract

Land surface-related multiple attenuation based on wave-equation deconvolution

SEG - Society of Exploration Geophysicists | Gordon Poole, Brandon Li, Mattia Miorali, Keith Mills, John Tickle ©2022 SEG

Free-surface multiple prediction of land data is challenging due to the unknown downward reflecting free-surface combined with poorly sampled recording of the shallow multiple generators. We use a wave-equation deconvolution approach to derive an image of the shallow multiple generators using the multiple periodicity ...

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Technical Abstract

Elastic FWI for large impedance contrasts

SEG workshop/forum/local conference | Zedong Wu, Zhiyuan Wei, Zhigang Zhang, Jiawei Mei, Rongxin Huang, Ping Wang ©2022 SEG

Recent advances in full-waveform inversion (FWI) algorithms have allowed it to work stably and effectively in different geological settings, especially in areas with geobodies of large impedance contrasts such as salt, despite its presently taken acoustic assumption. This has resulted in a leap in ...

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Technical Abstract

Unlocking the potential of WAZ data for subsalt imaging using FWI: A case study in the Perdido area

SEG - Society of Exploration Geophysicists | Vivek Vandrasi, Zhihua Su, Shouting Huang, Yogesh Agnihotri, Sabaresan Mothi ©2022 SEG

Full-waveform inversion (FWI) has become the norm in velocity model building for different surveys from land to marine, and from streamers to ocean bottom nodes. FWI using wide-azimuth (WAZ) streamer data in areas with complex geologic settings can fall short of resolving the complexity ...

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Technical Abstract

Assessing FWI Imaging’s potential to tackle illumination issues and internal multiples in the Brazilian pre-salt

SEG - Society of Exploration Geophysicists | Cyril Dolymnyj, Filipe Rudrigues, Amanda Porto, Leandro Galves, Asdrubal Ovalles ©2022 SEG

Most seismic surveys carried out in offshore Brazil consist of narrow-azimuth towed-streamer (NATS) acquisitions. In areas such as the South Atlantic offshore basins, the geological complexity results in illumination issues for NATS acquisitions, especially in the deep pre-salt section. Both Full-Waveform Inversion Imaging (FWI ...

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Technical Abstract

Revisiting the Brazilian Equatorial Margin with FWI and its impact on interpretation in an exploratory frontier

SEG - Society of Exploration Geophysicists | Diego Costa, Edmarley Ramos, Giuseppe Loconte, Filipe Rudrigues, Olivier Brachet ©2022 SEG

Recent technology advancements have enabled us to revisit the Foz do Amazonas (2014) and Barreirinhas (2016) narrow-azimuth towed-streamer (NATS) seismic surveys and tackle specific imaging challenges in a way that the legacy processing could not. In an exploratory frontier such as the Brazilian Equatorial ...

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