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Technical Content

Technical Abstract

A deterministic 4D processing flow to suppress acquisition-related noise at Dalia and Rosa fields

EAGE - European Association of Geoscientists and Engineers | Nicolas Salaun, Matthieu Pouget, Ziqin Yu, Claire Beigbeder, Anna Rivet, Segolene Dega, Manuel Peiro (CGG) ; Abderrahim Lafram, Andrea Grandi (Total E&P) ; Emerson Jungo (Total E&P Angola) ©2021 EAGE

Time-lapse seismic is now being used more frequently to assist reservoir development, prevent infrastructure damage or monitor geological storage. To better reveal true 4D signals while suppressing acquisition-related noise as a result of, for example, water velocity changes, source positioning errors etc., a new ...

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Technical Abstract

Acoustic Land Full-Waveform Inversion with Free-Surface Topography in Oman

EAGE - European Association of Geoscientists and Engineers | Gillian Royle, Olivier Leblanc, Ghislain Viguier, Gilles Lambare, Anna Sedova, Svetlana Shutova, Diego Carotti ©2020 EAGE

Successful applications of full waveform inversion (FWI) to land datasets are far less numerous than marine applications, yet the development of dense, long-offset broadband acquisitions has presented promising opportunities. While challenges exist due to elastic effects, acoustic land FWI has been shown to provide ...

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Technical Abstract

Bringing new insights to Central North Sea with OBN and FWI imaging

EAGE - European Association of Geoscientists and Engineers | Ramez Refaat, Krzysztof Ubik, James Sinden, Julian Holden ©2021 EAGE

Spanning decades of exploration and production in the United Kingdom Continental Shelf, many programs of towed streamer data have shaped our knowledge of the Central North Sea. However, the fundamental lack of illumination and azimuth/offset coverage provided by towed streamer geometries, remains a blocker ...

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Technical Abstract

Exploiting the Full Wavefield to Overcome Limitations of Ray Based Tomography in the Central North Sea

EAGE - European Association of Geoscientists and Engineers | Paul Fallon, Fiona Hall, Andy Holman, Gioia Cattini, Steve Hollingworth ©2020 EAGE

Full waveform inversion (FWI) using diving waves has in recent years become a standard model-building tool in the Central North Sea (CNS). Below the maximum depth of diving wave penetration however, we have remained reliant on ray based tomographic methods, which although powerful, have ...

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Technical Abstract

Extracting Knowledge with NLP from Massive Geological Documents

EAGE - European Association of Geoscientists and Engineers | Chin Hang Lun, Thomas Hewitt ©2021 EAGE

There have been many advances in natural language processing in recent years but most of the work have been focused on texts from a general domain or medicine and so datasets in the geology domain are sadly lacking. We demonstrate how existing taxonomy and ...

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Technical Abstract

FWI velocity and imaging: A case study in the Johan Castberg area

EAGE - European Association of Geoscientists and Engineers | Nicolas Salaun, Mathieu Reinier, Isabel Espin, Guillaume Gigou ©2021 EAGE

The Greater Castberg survey was acquired in 2019 using a source-over-spread acquisition design with an additional source at the front of the streamers, towed by the receiver boat, to permit recording of longer offsets. Starting from an initial anisotropic model, time-lag full waveform inversion ...

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Technical Abstract

Gabon Offshore - New Technology Enhancing Imaging of Complex Subsurface in Gabon

EAGE - European Association of Geoscientists and Engineers | Paolo Gabrielli, Simon Drummie, Ewa Kaszycka, Steve Thompson, Yuxuan Zhan, Rory Hover, Sridhar Mannem, Monika Ubik, Nicolas Morandini, Peeyush Upadhyay, Benjamin Bosbach (CGG) ; M Shah B Sulaiman, Christopher Lee Slind (Petronas) ©2020 EAGE

Offshore Gabon has several challenges for seismic exploration. The major difficulty is obtaining a detailed and accurate velocity model. Complicated salt structures with overhangs, variability within the salt and carbonate rafts with Karst features pose difficult challenges to conventional velocity model building. Moreover, these ...

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Technical Abstract

Imaging Rich Azimuth Towed Streamer Data West of Shetland

EAGE - European Association of Geoscientists and Engineers | Harrison Moore, Simon Drummie, Ewa Kaszycka, Gordon Poole, Krzysztof Cichy ©2020 EAGE

We discuss the processing and imaging challenges relating to a marine seismic survey acquired northwest of the Shetland Islands. The proximity of the survey to the islands forced the acquisition direction to be strike to the subsurface geology. A shooting vessel provided wide azimuth ...

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Technical Abstract

Impact of streamer acquisition geometry on FWI Imaging

EAGE - European Association of Geoscientists and Engineers | Henry Kerrison, Paul Fallon, Ewa Kaszycka, Krzysztof Cichy, Andrew Ratcliffe, Nabil Masmoudi ©2021 EAGE

The combination of ever-increasing computational power and more robust algorithms have made it possible to run full-waveform inversion (FWI) to higher frequencies and, also, offer more possibilities to take advantage of the reflections in the inversion. Through a process known as FWI Imaging, the ...

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