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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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Multi-Sensor Streamer Broadband 4D Acquisition

First Break, November, 2018
Jo Firth | Gordon Poole | Federico Buriola | Steve McDonald | Paul Fallon | Steve Hollingworth | James Cooper
©2018 EAGE

The desire to extend all the benefits of broadband 3D data to 4D time-lapse surveys has been hampered by the requirement for repeatability between successive surveys. The use of deep-towed multi-sensor streamers in time-lapse acquisition creates challenges, as the existing baseline surveys will often have been acquired using a shallow-tow streamer. For optimal 4D repeatability, subsequent monitor acquisitions would traditionally be acquired using the same streamer depth as the earlier surveys. We tested recording monitor data at a deeper streamer depth than the baseline survey using multi-sensor streamers, and then redatumming to simulate data recorded at the shallow streamer depth. Following this trial, we went on to acquire three 4D monitor surveys.

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Measuring gravity gradient in rugged terrain: HeliFalcon survey in Aso-Oguni, Japan

First Break, October, 2018
Tianyou Chen | Mark Dransfield
©2018 EAGE

In this paper, we look at the HeliFalcon AGG survey conducted in the Aso-Oguni area exploring for geothermal fields, examine the technical challenges presented by the rugged terrains, describe some aspects of the data acquisition and processing, and present the survey results.

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On top of the spread

Oilfield Technology, September, 2018
Jo Firth | Vetle Vinje
©2018 Palladian Publications Ltd

In order to solve the challenges of imaging the shallow reservoirs of the Barents Sea, CGG, in collaboration with Lundin Norway, have developed an innovative source-over-spread acquisition solution, known as TopSeis. This addresses the lack of near-offset data recorded in conventional towed-streamer acquisition by enabling recording of short and zero-offset data with a split spread, significantly increasing the illumination density of the subsurface. This article looks at the development of this technique with some recent results, including AVO.

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Seismic characterization and porosity workflow to support geological model update: a case study from presalt carbonate reservoir, Brazil

First Break, September, 2018
Laryssa Oliveira | Manuel Peiro | PEDRO JONAS AMARAL | FRANCIS PIMENTEL | JOAO CHRISTOVAN
©2018 EAGE

In this paper, we present an integrated study that combines geophysical and geological approaches to perform porosity estimation and populate the reservoir geological model with the estimated property. For pre-salt oilfields, due to the complex porosity distribution in carbonate reservoirs, predicting a reliable porosity is a fundamental step for reservoir modeling.

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A Log Based Method of Determining Dynamic Biot’s Coefficient

Hart's E & P, August, 2018
Reza Saberi | Fred Jenson
©2018 Hart Energy

This study uses multiple wells with high-quality acoustic and density logs to demonstrate a rock physics workflow for determining dynamic Biots’s coefficient from detailed petrophysical evaluation. One of the important inputs needed for determining dynamic Biots’s coefficient is a detailed interpretation of the rock which has been modeled in this study with a generic stochastic method. In this analysis saturated bulk modulus (Ksat) is assumed to be very close to dry bulk modulus (Kdry) which in unconventional reservoirs, because of the very low porosity, is reasonable. This condition, furthermore, is verified during analysis of the well log curve data.

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