Broadband Processing (SharpSeis Deghosting)

In typical marine seismic acquisition, a streamer towed at a specific depth records not only an upgoing wavefield reflected from the subsurface but also a downgoing field reflected from the sea surface, known as the ghost wavefield. Destructive interference between the upgoing and ghost wavefields generates a series of notch frequencies in the recorded spectrum, limiting the frequency band and reducing resolution.

RadExPro offers a proprietary Broadband Processing solution — the SharpSeis Deghosting, a reliable deghosting algorithm capable of removing both source and receiver side ghosts.

SharpSeis Deghosting Algorithm Specifications:

  • Applicable for conventional marine seismic acquisitions—does not require specific acquisition solutions
  • Efficient for different types of sources (airgun, sparker, boomer…)
  • Applicable for both 2D and 3D data
  • The algorithm is adaptive—capable of managing changing ghost time delays in both time and distance.

The algorithm was presented at EAGE Near Surface Geoscience 2014—First Applied Shallow Marine Geophysics Conference by Vakulenko et al (2014).

SharpSeis Deghosting helps recover a broader frequency spectrum, leading to enhanced seismic resolution and clearer imaging.

Examples of SharpSeis Deghosting Application

Norvegian Sea, marine seismic data, acquired with a P–Cable system with an airgun source and twelve 8–channel streamers towed at around 2.5 m.
The data is courtesy of P–Cable 3D AS company.

Amplitude spectrums before and after broadband processing

University of Trømso P–Cable acquisition, data acquired with an airgun source and deep–towed streamers.
The streamers were towed at around 12 m to facilitate deghosting and reduce the noises.

Raw data / Data, after SharpSeis deghosting application

Deghosting of 2D conventional marine seismic data, acquired in the bay of Naples.

Raw data / Data, after SharpSeis deghosting application

Data courtesy Istituto per l’Ambiente Marino Costiero—CNR, Naples, Italy

Reference:
Vakulenko, S.V. Buryak, P.A. Gofman and D.B. Finikov (2014), “Deghosting of High Resolution Marine Seismic Data by Adaptive Filtering Algorithm”, S.A., EAGE Near Surface Geoscience 2014—First Applied Shallow Marine Geophysics Conference