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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

Improving Sub-Messinian Images in the Nile Delta Using FWI and Least-Squares Q Migration

EAGE - European Association of Geoscientists and Engineers | Chi Chen, Huawei Gao, Xin Zhao, Zhao Wang, Jiawei Mei (CGG) ; Mark A. Benson (BP Houston) ; Bethan Turner (BP Egypt) ; Walter Rietveld (BP Exploration Ltd) ©2020 EAGE

The Messinian interval in the West Nile Delta, offshore Egypt, is a thin evaporite layer characterized by highly irregular velocities with rapid spatial variations. Its complexity poses unique challenges for sub-Messinian reservoir imaging, resulting in erratic gather curvatures, distorted structures, and nonuniform illumination. Conventional ...

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Technical Abstract

Integrated high-resolution model building: a case study from the Sultanate of Oman

EAGE - European Association of Geoscientists and Engineers | Mohammad Farooqui, Diego Carotti (CGG) ; Moosa Jahdhami (Petroleum Development Oman) ©2021 EAGE

The geology of northern Oman presents significant challenges for land velocity model building. We show in this paper that these challenges can be overcome by using an integrated high-resolution velocity model workflow, through the combination of different types of waves, that allow resolving different ...

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Technical Abstract

Joint PP-PS Inversion with Registration Optimisation to Improve Geological Knowledge of a Deep-Water Field West Africa

EAGE - European Association of Geoscientists and Engineers | Diego Lopez, Pierre Roy, Benjamin Roure (CGG) ; Anne-Sophie Barnola, Joffrey Brunellière (Total) ©2021 EAGE

Inversion has become the standard procedure to quantify elastic properties using seismic. PP seismic is commonly used for this purpose, but in areas where PP seismic is affected by gas pockets or mud volcanoes, the reflectivity can be compromised for reservoir characterization. PP-PS inversion ...

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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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