The importance of recording the full range of frequencies (low as well as high) is widely accepted for high resolution imaging. High fidelity, low frequency data provides deeper penetration for the clear imaging of deep targets, as well as providing greater stability in inversion.
Broader bandwidths produce sharper wavelets, therefore both low and high frequencies are required for sharp wavelets without sidelobes to provide high resolution imaging of important shallow features such as thin beds and small sedimentary traps.
|The lack of sidelobes provided by the low frequencies in a broadband wavelet redumake it possible to resolve a huge amount of detail, thanks to the lack of confusion caused by interference - in this case allowing dipping sediments to be traced right up to the water bottom.|
We take a two-sided approach to improving bandwidth. We actively generate a wider range of frequencies with our broadband seismic sources and we do our utmost to record them and preserve them during processing.
CGG has developed a range of broadband technologies across our product lines:
- Land Acquisition - UltraSeis features mega channel counts, point sources and point receivers for denser sampling, improved noise attenuation and reduced acquisition footprint, providing the finest resolution of the subsurface with the highest available spatial and temporal bandwidth.
- Marine Acquisition - BroadSeisTM delivers the sharpest wavelet and the best resolving power in the industry as well as the added penetration and imaging power of boosted low frequencies, providing a simple, available and robust solution for broadband marine acquisition.
- Seabed Acquisition - state-of-the-art fibre optic reservoir monitoring and exploration, using advanced SeaRay® cables and innovative, efficiently-deployed Trilobit nodes, provide integrated broadband seabed solutions.
- Subsurface Imaging using advanced algorithms to maximize the spatial and temporal resolution of seismic data, and maintain the full bandwidth while attenuating noise and multiples. We provide various processing solutions to deghost and boost the bandwidth of legacy data, though these do not provide the full bandwidth achieved by an acquisition soution.