Sentinel Solid Streamers

The CGG marine seismic fleet is fully equipped with Sercel Seal Sentinel® solid streamers. These streamers are recognized for their low-noise properties and low frequency recording capabilities, providing better signal penetration and benefitting sub-salt, sub-basalt and deep target imaging. The Sentinel MS muti-sensor streamer is the new addition to the Sentinel family and has recently been deployed on the Geo Coral. Sentinel MS retains the low-noise advantages of standard Sentinel streamers by using the same hydrophone configuration to measure pressure changes, but in addition adds an x and y accelerometer to measue the vertical and crossline wavefront and provide additional options for deghosting.

champion deck
Sentinel Reels
Sentinel MS

Sentinel streamers are designed for reduced noise and drag, and are the quietest towed -treamers  available to-day. Sentinel is the preferred streamer for consistency, reliability, high signal-to-noise ratio and low frequency recording, as CGG can tow these at up to 50m depth, for the deepest tow in the industry. They are proven in environmentally sensitive areas such as the Arctic, as they are robust and do not leak.

Features

  • Sentinel is the only truly solid streamerSentinel streamers water
    • Extruded polymer foam replaces fluid or gel
  • Hydrophone is isolated from strain member to reduce noise
  • Hydrophone is flexible
  • Designed to record high quality seismic:
    • Quieter low drag design
    • Uniform density produces consistent depths
  • Increased stability in variable salinity/water temperatures
  • Compatible with Sercel Nautilus® integrated 3-in-1 steering, depth control and accoustic device
  • Fast deployment and recovery
  • Improved reliability-by-design leading to less technical downtime

Benefits

  • noise graphEnvironmentally friendly
  • Proven in environmentally sensitive frontier areas, including the Arctic 
  • Improved signal-noise ratio
  • Consistent low noise performance for better 4D sensitivity
  • High fidelity low frequency recording
  • Deeper penetration for imaging beneath complex overburdens
  • Wider bandwidth for seismic inversion
  • Depth stability improves 4D reliability
  • Wider weather window

Low Noise

In the Sercel Sentinel solid streamer there is a single stress member at the core, isolated from the hydrophone by the PU foam. In fluid or gel streamers the hydrophone is at the core, and is coupled to the strain members. This means that solid streamers do not suffer from towing and environmental noise. This lower noise floor provides a better signal-to-noise ratio at low frequencies, allowing the use of lower low-cut filters. In a vibration tank test solid streamers are 12dB less noisy than gel streamers at 5Hz.

Additional Features of Sentinel MS

  • SentinelMS-components3-component streamer - 1 low-noise hydrophone and 2 orthogonal particle motion sensors.
  • Dynamically measured tilt measures true Y and Z, so eliminating athe need for ny gimbal system and associated noise.
  • The 3 components are co-located and group formed, maintainingthe 12.5m group length of standard Sentinel streamers, with the group design and length tuned to remove cable vibration.
  • P-wave recording is identical to that obtained from standard Sentinel solid streamers
  • Vz and Vy recordings provide additional data for use in deghosting using CGG's multi-sensor 3D deghosting
  • This provides an additional tool in our broadband toolbox, complementing our existing broadband options. We have the breadth of geoscience expertise to help you design the optimum acquisition solution for your survey, accordingto your needs.

Solid streamers and single hydrophones

Jim Spackman | Mundy Brink
©2004 SEG

How broadband can unlock the remaining hydroc...

Gregor Duval
©2012 EAGE

Broadband, long-offset, full-azimuth, stagger...

Fabrice Mandroux | Beng Ong | Chu-Ong Ting | Sabaresan Mothi...
©2013 EAGE
Offshore - Nautilus Streamer Steering

Nautilus Streamer Steering

Better 3D coverage, improved 4D repeatability, reduced infill. Integrated streamer control with acoustic positioning, depth control and automatic steering.

Offshore - 4D Solutions

4D Solutions

Our 4D toolbox ensures seismic repeatability via powerful integrated vessel, source and streamer steering with source signature monitoring .
Offshore - Arctic Exploration

Arctic Exploration

Environmentally friendly C-Class vessels. Extreme conditions are no match for our solid streamers. Our people are resourceful. Our experience is deep.

Offshore (Marine)

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