Optimize Field Development Plans

With CGG Marine Acquisition

StagSeis fleet

The StagSeis fleet in operation in the Gulf of Mexico

Once hydrocarbons have been discovered, surveying becomes more detailed in order to ascertain the volume of reserves and the ease of exploitation. CGG can deliver the necessary data to answer these questions. Careful planning before starting a survey enables reservoir-quality data to be acquired, with the right illumination, the right sampling density and sufficient bandwidth to enable quantitative reservoir characterization studies to be performed. As an integrated geoscience company we involve our GeoConsulting Seismic Reservoir Characterization experts and Subsurface Imaging teams in the survey planning from the beginning to ensure excellent quality data to characterize the reservoir fully.

Tailored solutions for full or wide azimuths for improved illumination

CGG can develop bespoke survey acquisition geometries to address the specific reservoir challenge. For example, StagSeis  ultra-long-offset, full-azimuth broadband data  was developed to improve illumination and enable imaging beneath the salt structures of the Gulf of Mexico. Offshore West Africa B-WATS (broadband wide-azimuth towed-streamer) was developed to mage beneath differently-shaped salt structures in shallower water, where near offsets are more important for multiple modelling. We perform detailed ray-tracing to work out the best way to illuminate the target so that the best possible image is achieved.

Volumetric analysis

Better volumetric analysis and economic evaluations can be made from BroadSeisTM broad bandwidth data, as this delivers sharp wavelets without sidelobes so that the actual geologic signature of events can be identified. With BroadSeis wavelets each peak or trough corresponds to a genuine geological layer. This clarifies impedance contrasts, creates sharp images of small features and provides clear differentiation between different sedimentary packages.

miocene channels

Facies Differentiation

The low frequencies delivered by BroadSeis help highlight channel sand facies with subtle, darker colours in contrast to lighter adjacent mud-rich sediments.  A stunning example of the need for ultra-low frequencies to delineate channel architecture is demonstrated in the frequency decomposition image of a turbidite channel complex in the Kwanza Basin, offshore Angola, shown right. Here various phases of sediment fill, meander growth and incisions can be identified clearly. Without the ultra-low (2.5Hz) frequencies the red channel would not be visible and it would not be possible to track these channels and high-quality reservoir sands.

Inversion

Full Waveform Inversion (FWI), acoustic inversion and elastic inversion all benefit from the low frequencies delivered by BroadSeis. Good low frequencies play an important role in the practical use of FWI as they help to avoid cycle skipping and the model converging to the wrong event on the input data. In seismic inversion the low frequencies delivered by BroadSeis, especially when combined with a higher frequency velocity model from FWI, enable quantitative results to be obtained even away from existing wells.

Broadband Seismic Technology and Beyond Part ...

Lasse Amundsen | Martin Landro
©2014 GeoPublishing Ltd

Broadband seismic technology and beyond: Part...

Lasse Amundsen | Martin Landro | Vetle Vinje | Jo Firth
©2014 GeoPublishing Ltd

New technology breathes new life into mature ...

Vetle Vinje | Andrew Wright | Jo Firth | Jan-Erik Lie | Vida...
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Subsurface Imaging - FWI

Full Waveform Inversion

Reveal intricate velocity details for the clearest images. Harness seismic low frequencies from BroadSeis, StagSeis, seabed and land data.

Offshore - BroadSeis AVO & Inversion

BroadSeis AVO & Inversion

The low frequencies achieved by BroadSeis deliver stable inversion results, even away from existing wells making lithology prediction more reliable
Offshore - GeoHazards

Solutions for Geohazards

Clear, high-resolution near-surface images to delineate the smallest structures. Over 6 octaves of data from BroadSource for shallow hazard identification.
Offshore - BroadSeis for Development

BroadSeis for Development

Quantitative inversion, even without wells, for accurate models and better decisions delivered by the broadest bandwidth and best low frequencies.
Offshore - Low Frequency Recording

Ultra-Low Frequency Recording

See below salt and basalt. Build better reservoir models. Record useful data down to 2.5 Hz with Sentinel.
Multi-Client Data - Cornerstone

Cornerstone

35,000km2 Cornerstone contiguous broadband PSDM data with added-value Facies Finder and PPP products to help pinpoint the best prospects


Offshore (Marine)

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Sustainability - Marine Seismic Equipment Ecodesign Sentinel

CASE STUDY

Discover how we increase marine seismic acquisition productivity while minimizing environmental footprint.

Sustainability - Sustainable Development Report 2013

SUSTAINABLE DEVELOPMENT
REPORT

In 2014, CGG published its second Sustainable Development report as its 6th Communication on Progress.