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Technical Content

Technical Abstract

Multi-Well 4D DAS VSP: A Case Study at Mars Basin, Gulf of Mexico

EAGE - European Association of Geoscientists and Engineers | Huawei Gao, Chujia Chen, Chi Chen, Jiawei Mei, Rongxin Huang (CGG) ; Ge Zhan, Jay Nahm (BP) ©2021 EAGE

We present a 4D case study of time-lapse multi-well Vertical Seismic Profiling (VSP) acquired with Distributed Acoustic Sensing (DAS) at the Mars field, deepwater Gulf of Mexico. In this work, we are able to obtain meaningful 4D signals from multi-well DAS VSPs by addressing ...

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Technical Abstract

Optimal Transport FWI with Graph transform: Analysis and Proposal of a Partial Shift Strategy

EAGE - European Association of Geoscientists and Engineers | Felix Kpadonou, Jeremie Messud, Anna Sedova, Mathieu Reinier ©2021 EAGE

The use of graph-space optimal transport within foil-waveform inversion (FWI) has recently been proposed to enhance robustness to cycle-skipping. In this paper, we discuss several features of the graph-space optimal transport FWI, emphasizing in particular its ability to detect time shifts between modelled and ...

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Technical Abstract

Overcoming shallow water imaging challenges in Australia’s North West Shelf

EAGE - European Association of Geoscientists and Engineers | Xiang Li, Kai Zhao, Hui Zhang, Jianfeng Yao, Sergey Birdus, Joe Zhou ©2020 EAGE

The North West Shelf, situated in Western Australia, is a world-class offshore hydrocarbon province. The presence of hard water bottom, near water bottom reflectors and shallow Tertiary carbonates not only generates strong multiples but also distorts the ray-paths for deeper reflectors. Seismic data quality ...

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Technical Abstract

Pre-migration residual multiple subtraction using post-migration matching for North Sea OBN data

EAGE - European Association of Geoscientists and Engineers | Gareth Jones, Julian Holden, Ramez Refaat, Katarzyna Galyga, Luke Summers (CGG) ; Adrian Merry, Eoin McManus, Sam Whitehead (Total) ©2021 EAGE

In the North Sea, water bottom related surface multiples offer one of the largest challenges to a seismic processing project with a careful balance between multiple attenuation and primary preservation required when using a model and subtract approach. For Ocean Bottom Node (OBN) data ...

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Technical Abstract

Pre-Salt Prospectivity in Brazil and Gabon: Discriminating Between Lakes and Lake-Like Water Bodies

EAGE - European Association of Geoscientists and Engineers | Rob Crossley, Rachael Harrison, Gregor Duval, Alexandra Ashley ©2020 EAGE

Stratal geometries, reservoir and source facies are different in true lakes, in lakes with restricted access to the global ocean, and in “lakes” continuously connected to the global ocean but capped by large quantities of freshwater. We illustrate the importance for exploration and development ...

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Technical Abstract

Resolving Small Scale Lateral Velocity Anomalies without FWI or Stochastic Approaches

EAGE - European Association of Geoscientists and Engineers | Mathieu Reinier, Thibaut Allemand, Nicolas Salaun, Ziqin Yu, Matthieu Pouget, Anne Henry-baudot, Bruno Chaintreuil, Majda Mihoub, Guillaume Gigou, Isabel Espin ©2021 EAGE

Small-scale heterogeneities create distortions in the wavefield that are usually resolved by Full Waveform Inversion (FWI). When FWI fails (for lack of diving waves or low frequencies), recent works promote the use of targeted stochastic approaches maximizing the stack power. We instead revisit here ...

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Technical Abstract

Revealing 4D Subsidence with 3D Water-Bottom Traveltime Inversion

EAGE - European Association of Geoscientists and Engineers | Segolene Dega, Thibaut Allemand, Ziqin Yu, Nicolas Salaun (CGG) ; Abderrahim Lafram, Andrea Grandi, Emerson Jungo (TOTAL E&P) ©2021 EAGE

The quality of time-lapse analysis depends highly on the repeatability of the acquisition. However, in practice, it is almost impossible to perfectly mimic a base survey due to environmental conditions and inaccurate measurements. Lack of repeatability often results in 4D noise, which may compromise ...

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Technical Abstract

Revealing Complex Sub-Basalt Structures Offshore India Through Advanced Seismic Processing

EAGE - European Association of Geoscientists and Engineers | Xiaobo Li, Priyanka Bhattacharjee, Peipei Deng, Keat Huat Teng, Barry Hung, Jason Sun (CGG) ; Subhankar Basu, N.N.B. Naidu (ONGC) ©2020 EAGE

Sub-basalt seismic imaging is very challenging due to large impedance contrasts at sediment-basalt interfaces. The impedance of basalt usually gives a strong reflection coefficient at the top of basalt, and thus generates strong multiples. Offshore western India, this issue is compounded by short-period seabed ...

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Technical Abstract

Sparse wave-equation deconvolution imaging for improved shallow water demultiple

EAGE - European Association of Geoscientists and Engineers | Gordon Poole, Harrison Moore, Elzbieta Blaszczak, Henry Kerrison, Saba Keynejad, Alessia Taboga, Martin Chappell ©2021 EAGE

The attenuation of surface related multiples is typically one of the most challenging steps in the processing of shallow water marine projects. Least-squares wave-equation deconvolution imaging is a powerful tool to address this challenge, but images derived from a deep target level may produce ...

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