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Technical Content

Industry Article

The value of very low frequencies and far offsets for seismic data in the Permian Basin: Case study on a new dense survey from the Central Basin Platform

The Leading Edge | Vincent Durussel, Dongren (Alan) Bai, Amin Baharvand, Scott Downie (CGG) ; Keith Millis (Occidental Petroleum) ©2022 SEG

This paper describes a new dense survey acquired in 2020 in the Permian Basin and aims to objectively assess the quality and benefits brought by a richer low end of the spectrum and far offsets. For this purpose, we considered several aspects, from acquisition ...

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Industry Article

Revival of legacy land seismic surveys using advanced processing technologies: an example from the Carpathian foothills

First Break | Adrien Meffre, Vincent Prieux, Matthieu Retailleau, David Le Meur, Abel Afonso Monteiro, Zied Bouzouita, Fang Wang, Sofia Mestiri (CGG) ; Justin Vermuelen, Emma Tyler (OMV Petrom) ; Jozsef Orosz, Tunde Markos (OMV E&P) ©2022 EAGE

Twelve multi-source/multi-receiver land surveys from the Carpathian foothills were reprocessed and merged using the most advanced signal processing and imaging technologies. These included an innovative denoising subtraction using a primary model from the de-migration of a clean reflectivity from PSDM as well as a ...

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Industry Article

A decade of HPC in oil

First Break | Jean-yves Blanc, Laurent Clerc ©2021 EAGE

CGG has always been at the forefront of industrial High Perfor­mance Computing (HPC) architectures: we were operating vector supercomputers (Convex, Cray and NEC) in the early 1990s, and large parallel supercomputers (Convex SPP, IBM SP, Sgi Origin) by the end of that decade. At ...

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Industry Article

Optimal transport full-waveform inversion: from theory to industrial applications with examples from the Sultanate of Oman

First Break | Jeremie Messud, Diego Carotti, Olivier Hermant, Anna Sedova, Gilles Lambare ©2021 EAGE

The optimal transport problem was formulated more than 200 years ago to calculate the optimal way of transporting piles of sand. Due to the interesting properties of its solutions with respect to shifts between the compared distributions, optimal transport has recently been adapted to ...

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Technical Abstract

Learnings from an FWI imaging study using 3D and 4D data over a postsalt field in Campos Basin

SEG - Society of Exploration Geophysicists | Samanta Bortoni, Sergio Barragan, Gregorio Azevedo, Luis Cypriano (CGG) ; André Ferreira, Wendel Moreira, Paula dos Reis, Wilson Filho (PETROBRAS) @2021 Society of Exploration Geophysicists

Seismic images obtained through conventional migration methods have limitations as amplitude distortions and migration artifacts. To mitigate these limitations, we can generate FWI Images by computing the reflector-normal derivatives of the high-frequency FWI velocities. Given the resolution, accuracy, and geological consistency of the velocities ...

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Technical Abstract

RTM 3D angle gathers for OBN data using an equal area spherical binning method

SEG - Society of Exploration Geophysicists | Roberto Pereira, Ivan Coulamy, Adriano Martinez (CGG) ; Werter Oliveira, Eduardo Naomitsu (PETROBRAS) @2021 Society of Exploration Geophysicists

Compared with towed-streamer acquisitions, ocean bottom nodes (OBN) generally provide fuller-azimuth illumination of the subsurface, longer offsets, higher signal-to-noise ratio (S/N), and improved low frequencies. These advantages provide the necessary ingredients for two key elements of seismic exploration and monitoring: (i) full-waveform inversion (FWI) ...

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Technical Abstract

Joint time-lapse full-waveform inversion with a time-lag cost function

SEG - Society of Exploration Geophysicists | Zhiguang Xue, Zhigang Zhang, Ping Wang (CGG) ; Jun Cai (BHP) @2021 Society of Exploration Geophysicists

Seismic time-lapse (4D) surveys have been widely used to quantitatively monitor the geophysical property changes within hydrocarbon reservoirs due to production effects. Full-waveform inversion (FWI), which has become one of the most reliable tools for velocity model building (VMB), is a natural technology choice ...

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Technical Abstract

Paradigm shift: Recent advances in model building and imaging at Shenzi

SEG - Society of Exploration Geophysicists | Brad Wray, Linn Zheng, Fabian Rozario, Xue Zhang, Nicolas Chazalnoel (CGG) ; Cheryl Mifflin (BHP) @2021 Society of Exploration Geophysicists

After many years of processing seismic streamer data acquired over the Shenzi field in deep-water Gulf of Mexico (GOM) with the best available technology, the workflows have remained highly interpretive, far from robust, often time-consuming, and ultimately proved inadequate for resolving the complexity of ...

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Technical Abstract

Sim-source for 4D: Learnings from processing the first ISS OBN monitor survey at Atlantis

SEG - Society of Exploration Geophysicists | Jing Yang, Xin He, Jiawei Mei, Rongxin Huang (CGG) ; Qingsong Li, Kang Fu, Jean-Paul van Gestel (BP) @2021 Society of Exploration Geophysicists

Driven by the notion that blending noise may materially increase the background noise level and obscure the interpretation of weak time-lapse (4D) signals related to subtle reservoir changes, the industry has not yet seen any simultaneous-source (sim-source) surveys acquired for reservoir monitoring. Thus, whether ...

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