Ultra-Low Frequencies

The curved shape of BroadSeisTM streamers delivers the optimal signal-to-noise ratio at low frequencies for more quantitative and reliable inversion results, simplified interpretation and detailed facies discrimination. This delivers more accurate reservoir models, so enabling better development plans and improved ROI. The low frequencies are also crucial for Full Waveform Inversion for better velocity models and clearer imaging.

Cornerstone slice

Exceptional images from wavelets without sidelobes

Miocene channels Angola

Improved facies discrimination for better architecture definition

NWAus stratigraphy

Amazing stratigraphic detail for more accurate interpretation

StagSeis FWI

Low frequencies are ideal for FWI and detailed velocity modeling

Cornerstone channels

More accurate volumetric analysis from delineation of fine detail

Santos inversion

More reliable and quantitative inversion attributes

The inclusion of low frequencies reduces the sidelobes of the wavelets, so that each peak or trough represents a real change in acoustic impedance, clarifying interpretation. Low frequencies also add "texture" to the data, making layer differentiation easier and simplifying correlation across faults, as well as providing stunning images.

zero notch graphThe streamers are towed deeper in BroadSeis than in any other towed-streamer broadband configuration, the profile generally varying from around 7 to 50m, with an average depth of 40m compared to 20-25m for multi-sensor streamers. The deeper tow of BroadSeis provides the best low-frequency content of any towed-streamer broadband solution

  • There is 11dB less attenuation at 5Hz due to using a cable at 40m than a cable at 10m
  • In addition, towing deep increases the signal-to-noise ratio
  • Sentinel solid streamers are 10-15dB quieter than gel streamers below 10Hz as they are decoupled from the stress members and so suffer less from tug noise.

The stability of the low frequencies can be ensured by 3D designature using signatures estimated from recordings at the near field hydrophone using FSC (Full Source Characterization).

Experiencing the full bandwidth of energy fro...

Jo Firth | Idar Horstad | Menne Schakel
©2014 EAGE

Improved imaging in Santos Basin utilizing va...

Jeremy Langlois | Bing Bai | Yan Huang
©2013 SEG

How broadband can unlock the remaining hydroc...

Gregor Duval
©2012 EAGE
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 - BroadSeis Interp

BroadSeis Interpretation

Confident interpretation from clear differentiation between sedimentary packages and better facies discrimination with the ultra-low frequencies delivered by BroadSeis.
Offshore - StagSeis

StagSeis

Illuminate subsalt and basalt like never before. Reduce exploration and production risk. Ultra long-offset, full-azimuth broadband for unparalleled interpretation.
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.
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 - Sentinel Solid Streamers

Sentinel Solid Streamers

Best signal-to-noise ratio. Lowest frequencies. Most reliable 4D. Widest weather window. Broadband ready. For the most demanding applications, choose Sentinel.

Offshore (Marine)

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