BroadSource

A synchronized multi-level broadband source

BroadSourceTM extends the spectrum to the ultra-high frequencies for better resolution and clearer images of the subsurface. It is a synchronized multi-level source which, combined with specially developed processing algorithms, eliminates the source ghost notch while providing the same low frequencies as our deep-towed conventional source.

BroadSource data NWAusBroadSource deployed with slant streamers in the Browse Basin, Australia. Data courtesy of Shell.

Broadsource provides over 6 octaves of signal in the shallow section (up to 200Hz), with ultra-high frequencies limited only by the Nyquist recording interval and the Earth's absorption.

BroadSource is extremely flexible and is compatible with all receiver acquisition techniques. To gain the full benefit from Broadsource to deliver ghost-free broad bandwidths, Broadsource should be deployed in combination with a broadband receiver deghosting solution, and is fully compatible with ocean bottom nodes, BroadSeis, straight slant or deep flat tow combined with GWE (ghost wavefield elimination).

Broadsource is widely commercially-available and can be deployed by all CGG vessels. It is a proven broadband source solution, CGG has acquired over 75,000 sq km of 3D data with Broadsource, in combination with various broadband receiver deghosting solutions.

BroadSource cartoon

Benefits:

  • All the advantages of a conventional source:
    • reliable, adjustable and repeatable
    • deployable as a flip-flop dual array
  • High-resolution, broad-bandwidth ghost-free seismic data (2.5Hz to anti-alias filter)
  • Better resolution and clearer images of the subsurface
  • Reinforces improved BroadSeis layer differentiation
  • Enhanced shallow resolution, suitable for site surveys

Ghost-free broadband data

BroadSource uses air guns at different levels to defocus the source ghost, so that it can be removed by designature. The firing of the guns is synchronized so that the deeper gun fires as the down-going energy from the shallower gun reaches it, creating a consolidated, focussed, down-going wavefront. The up-going energy is unsynchronized and therefore delivers unfocussed ghost wavefronts, enabling attenuation of the ghosts by designature. This designature process requires the use of an accurate far-field signature, which we derive from recorded near-field hydrophone measurements by Full Source Characterization (FSC).

We believe that the best broadband solution in the marketplace today is the combined offer of BroadSource and BroadSeis for most geological and operational contexts. However, CGG can provide BroadSource as a standalone solution in combination with any receiver acquisition technique, based on customer preferences and the specifics of the geology and operational environment.

Synchronized multi-level source and Variable-...

Ronan Sablon | Thierry Payen | Danny Hardouin | Damien Russi...
©2013 EAGE

Monitoring of air-gun source signature direct...

Cheikh Niang | Yuan Ni | Julie Svay
©2013 SEG

Synchronized multi-level source, a robust bro...

Risto Siliqi | Thierry Payen | Ronan Sablon
©2013 SEG
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 - FSC

Full Source Characterization

Full characterization of the source signature, monitored in near real time to enable the most accurate designature.
Multi-Client Data - North Viking Graben

North Viking Graben

A huge integrated geoscience program covering over 35,000km2 of the North Viking Graben. BroadSeis-BroadSource ghost-free data with reservoir-oriented QC.
Offshore - BroadSource & BroadSeis

BroadSource & BroadSeis

Get the widest bandwidth and highest frequencies from ghost-free wavelets without compromising low frequencies. Available in flip-flop mode across the fleet.
Multi-Client Data - Davros

Davros

New survey located in the Northern Carnarvon Basin, combining BroadSeisTM and BroadSourceTM to deliver exceptional data quality and reveal new exploration opportunities.


Offshore - TopSeis

TopSeis

A next-generation marine acquisition solution for acquiring zero and near offsets to improve the imaging of shallow and intermediate targets.
Offshore (Marine)

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