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The benefits of CGG technologies and services are regularly featured in the industry press. Find out more by consulting our e-library of published industry articles. Narrow your search by entering at least one search criterion:

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Accounting for bias and uncertainty in facies estimations from deterministic inversions

Geophysical Society of Houston, June, 2017
John Pendrel | Henk Schouten | Raphael Bornard
©2017

Bayesian inference procedures can be used as interpretation tools for seismic inversions. The results are facies and their probabilities of occurrence derived from the native outcomes of inversions or their derivatives. Although deterministic inversions produce a single outcome, they have uncertainties associated with them. Further, due to inappropriate low frequency models or thin bedding, biases in the inversion properties can arise. We use a phenomenological approach to model these effects and separately correct for them in the subsequent Bayesian inference. The results are facies interpretations and pay maps which account for bias and uncertainties and will provide greater confidence in reservoir volume estimates.

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Creating value from National Data Repositories

CGG White Paper, June, 2017
Kerry Blinston | Karen Blohm
©2017

Self-published 12-page White Paper on the subject of National Data Repositories. Distributed at NDR conference in June 2017.

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TopSeis - shooting over the seismic spread

First Break, June, 2017
Vetle Vinje | Risto Siliqi | Carl-inge Nilsen | Erik Hicks | Anne Dagny Camerer | Jan Erik Lie | Vidar Danielsen | Per-Eivind Dhelie
©2017 EAGE

In this paper we present a new source-over-cable marine seismic acquisition technique that initially was developed to meet imaging challenges of the Loppa High in the Norwegian Barents Sea. Two seismic vessels operate in tandem; one streamer vessel towing a spread of deep, densely spaced streamers, and one source vessel with two or more sources. The source vessel is shooting on top of the seismic spread which facilitates acquisition of zero-offset, as well as split-spread data. This creates a unique illumination of the subsurface, especially in the shallow but also to intermediate target depths. The solution has been developed and tested in close cooperation between CGG and Lundin through a comprehensive modelling and field trial program involving a series of safety and mechanical tests and also a small 3D test survey.

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New Seismic Interference Mitigation Techniques Eliminate Time-Sharing

Oilfield Technology, May, 2017
Jo Firth
©2017 Palladian Publications Ltd

Seismic Interference (SI) has long been a problem for seismic data acquisition in congested areas such as the North Sea, but thanks to advances in processing algorithms and new cooperative management techniques developed in conjunction with Statoil and RIL, downtime or time sharing due to SI has been effectively eliminated.

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Post-stack attribute-based fracture characterization: A case study from the Niobrara shale

First Break, May, 2017
Geoffrey Dorn | Joseph Dominguez
©2017 EAGE

The detection and mapping of fractures in migrated poststack 3D seismic data depends on the resolution and signal-tonoise ratio of the data in the seismic volume. A discussion of resolution problems and the limits of resolution in post-stack 3D seismic data, and structurally-oriented post-stack coherent and random noise filtering is followed by descriptions of a Fracture Density attribute and of the extraction of fracture orientations.

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